1/* PowerPC64-specific support for 64-bit ELF. 2 Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 3 Free Software Foundation, Inc. 4 Written by Linus Nordberg, Swox AB <info@swox.com>, 5 based on elf32-ppc.c by Ian Lance Taylor. 6 Largely rewritten by Alan Modra <amodra@bigpond.net.au> 7 8 This file is part of BFD, the Binary File Descriptor library. 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 3 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License along 21 with this program; if not, write to the Free Software Foundation, Inc., 22 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 23 24 25/* The 64-bit PowerPC ELF ABI may be found at 26 http://www.linuxbase.org/spec/ELF/ppc64/PPC-elf64abi.txt, and 27 http://www.linuxbase.org/spec/ELF/ppc64/spec/book1.html */ 28 29#include "sysdep.h" 30#include <stdarg.h> 31#include "bfd.h" 32#include "bfdlink.h" 33#include "libbfd.h" 34#include "elf-bfd.h" 35#include "elf/ppc64.h" 36#include "elf64-ppc.h" 37 38static bfd_reloc_status_type ppc64_elf_ha_reloc 39 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 40static bfd_reloc_status_type ppc64_elf_branch_reloc 41 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 42static bfd_reloc_status_type ppc64_elf_brtaken_reloc 43 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 44static bfd_reloc_status_type ppc64_elf_sectoff_reloc 45 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 46static bfd_reloc_status_type ppc64_elf_sectoff_ha_reloc 47 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 48static bfd_reloc_status_type ppc64_elf_toc_reloc 49 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 50static bfd_reloc_status_type ppc64_elf_toc_ha_reloc 51 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 52static bfd_reloc_status_type ppc64_elf_toc64_reloc 53 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 54static bfd_reloc_status_type ppc64_elf_unhandled_reloc 55 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 56static bfd_vma opd_entry_value 57 (asection *, bfd_vma, asection **, bfd_vma *); 58 59#define TARGET_LITTLE_SYM bfd_elf64_powerpcle_vec 60#define TARGET_LITTLE_NAME "elf64-powerpcle" 61#define TARGET_BIG_SYM bfd_elf64_powerpc_vec 62#define TARGET_BIG_NAME "elf64-powerpc" 63#define ELF_ARCH bfd_arch_powerpc 64#define ELF_MACHINE_CODE EM_PPC64 65#define ELF_MAXPAGESIZE 0x10000 66#define ELF_COMMONPAGESIZE 0x1000 67#define elf_info_to_howto ppc64_elf_info_to_howto 68 69#define elf_backend_want_got_sym 0 70#define elf_backend_want_plt_sym 0 71#define elf_backend_plt_alignment 3 72#define elf_backend_plt_not_loaded 1 73#define elf_backend_got_header_size 8 74#define elf_backend_can_gc_sections 1 75#define elf_backend_can_refcount 1 76#define elf_backend_rela_normal 1 77#define elf_backend_default_execstack 0 78 79#define bfd_elf64_mkobject ppc64_elf_mkobject 80#define bfd_elf64_bfd_reloc_type_lookup ppc64_elf_reloc_type_lookup 81#define bfd_elf64_bfd_reloc_name_lookup ppc64_elf_reloc_name_lookup 82#define bfd_elf64_bfd_merge_private_bfd_data ppc64_elf_merge_private_bfd_data 83#define bfd_elf64_new_section_hook ppc64_elf_new_section_hook 84#define bfd_elf64_bfd_link_hash_table_create ppc64_elf_link_hash_table_create 85#define bfd_elf64_bfd_link_hash_table_free ppc64_elf_link_hash_table_free 86#define bfd_elf64_get_synthetic_symtab ppc64_elf_get_synthetic_symtab 87 88#define elf_backend_object_p ppc64_elf_object_p 89#define elf_backend_grok_prstatus ppc64_elf_grok_prstatus 90#define elf_backend_grok_psinfo ppc64_elf_grok_psinfo 91#define elf_backend_write_core_note ppc64_elf_write_core_note 92#define elf_backend_create_dynamic_sections ppc64_elf_create_dynamic_sections 93#define elf_backend_copy_indirect_symbol ppc64_elf_copy_indirect_symbol 94#define elf_backend_add_symbol_hook ppc64_elf_add_symbol_hook 95#define elf_backend_check_directives ppc64_elf_check_directives 96#define elf_backend_as_needed_cleanup ppc64_elf_as_needed_cleanup 97#define elf_backend_archive_symbol_lookup ppc64_elf_archive_symbol_lookup 98#define elf_backend_check_relocs ppc64_elf_check_relocs 99#define elf_backend_gc_mark_dynamic_ref ppc64_elf_gc_mark_dynamic_ref 100#define elf_backend_gc_mark_hook ppc64_elf_gc_mark_hook 101#define elf_backend_gc_sweep_hook ppc64_elf_gc_sweep_hook 102#define elf_backend_adjust_dynamic_symbol ppc64_elf_adjust_dynamic_symbol 103#define elf_backend_hide_symbol ppc64_elf_hide_symbol 104#define elf_backend_always_size_sections ppc64_elf_func_desc_adjust 105#define elf_backend_size_dynamic_sections ppc64_elf_size_dynamic_sections 106#define elf_backend_init_index_section _bfd_elf_init_2_index_sections 107#define elf_backend_action_discarded ppc64_elf_action_discarded 108#define elf_backend_relocate_section ppc64_elf_relocate_section 109#define elf_backend_finish_dynamic_symbol ppc64_elf_finish_dynamic_symbol 110#define elf_backend_reloc_type_class ppc64_elf_reloc_type_class 111#define elf_backend_finish_dynamic_sections ppc64_elf_finish_dynamic_sections 112#define elf_backend_link_output_symbol_hook ppc64_elf_output_symbol_hook 113#define elf_backend_special_sections ppc64_elf_special_sections 114 115/* The name of the dynamic interpreter. This is put in the .interp 116 section. */ 117#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 118 119/* The size in bytes of an entry in the procedure linkage table. */ 120#define PLT_ENTRY_SIZE 24 121 122/* The initial size of the plt reserved for the dynamic linker. */ 123#define PLT_INITIAL_ENTRY_SIZE PLT_ENTRY_SIZE 124 125/* TOC base pointers offset from start of TOC. */ 126#define TOC_BASE_OFF 0x8000 127 128/* Offset of tp and dtp pointers from start of TLS block. */ 129#define TP_OFFSET 0x7000 130#define DTP_OFFSET 0x8000 131 132/* .plt call stub instructions. The normal stub is like this, but 133 sometimes the .plt entry crosses a 64k boundary and we need to 134 insert an addi to adjust r12. */ 135#define PLT_CALL_STUB_SIZE (7*4) 136#define ADDIS_R12_R2 0x3d820000 /* addis %r12,%r2,xxx@ha */ 137#define STD_R2_40R1 0xf8410028 /* std %r2,40(%r1) */ 138#define LD_R11_0R12 0xe96c0000 /* ld %r11,xxx+0@l(%r12) */ 139#define MTCTR_R11 0x7d6903a6 /* mtctr %r11 */ 140#define LD_R2_0R12 0xe84c0000 /* ld %r2,xxx+8@l(%r12) */ 141 /* ld %r11,xxx+16@l(%r12) */ 142#define BCTR 0x4e800420 /* bctr */ 143 144 145#define ADDIS_R12_R12 0x3d8c0000 /* addis %r12,%r12,off@ha */ 146#define ADDI_R12_R12 0x398c0000 /* addi %r12,%r12,off@l */ 147#define ADDIS_R2_R2 0x3c420000 /* addis %r2,%r2,off@ha */ 148#define ADDI_R2_R2 0x38420000 /* addi %r2,%r2,off@l */ 149 150#define LD_R11_0R2 0xe9620000 /* ld %r11,xxx+0(%r2) */ 151#define LD_R2_0R2 0xe8420000 /* ld %r2,xxx+0(%r2) */ 152 153#define LD_R2_40R1 0xe8410028 /* ld %r2,40(%r1) */ 154 155/* glink call stub instructions. We enter with the index in R0. */ 156#define GLINK_CALL_STUB_SIZE (16*4) 157 /* 0: */ 158 /* .quad plt0-1f */ 159 /* __glink: */ 160#define MFLR_R12 0x7d8802a6 /* mflr %12 */ 161#define BCL_20_31 0x429f0005 /* bcl 20,31,1f */ 162 /* 1: */ 163#define MFLR_R11 0x7d6802a6 /* mflr %11 */ 164#define LD_R2_M16R11 0xe84bfff0 /* ld %2,(0b-1b)(%11) */ 165#define MTLR_R12 0x7d8803a6 /* mtlr %12 */ 166#define ADD_R12_R2_R11 0x7d825a14 /* add %12,%2,%11 */ 167 /* ld %11,0(%12) */ 168 /* ld %2,8(%12) */ 169 /* mtctr %11 */ 170 /* ld %11,16(%12) */ 171 /* bctr */ 172 173/* Pad with this. */ 174#define NOP 0x60000000 175 176/* Some other nops. */ 177#define CROR_151515 0x4def7b82 178#define CROR_313131 0x4ffffb82 179 180/* .glink entries for the first 32k functions are two instructions. */ 181#define LI_R0_0 0x38000000 /* li %r0,0 */ 182#define B_DOT 0x48000000 /* b . */ 183 184/* After that, we need two instructions to load the index, followed by 185 a branch. */ 186#define LIS_R0_0 0x3c000000 /* lis %r0,0 */ 187#define ORI_R0_R0_0 0x60000000 /* ori %r0,%r0,0 */ 188 189/* Instructions used by the save and restore reg functions. */ 190#define STD_R0_0R1 0xf8010000 /* std %r0,0(%r1) */ 191#define STD_R0_0R12 0xf80c0000 /* std %r0,0(%r12) */ 192#define LD_R0_0R1 0xe8010000 /* ld %r0,0(%r1) */ 193#define LD_R0_0R12 0xe80c0000 /* ld %r0,0(%r12) */ 194#define STFD_FR0_0R1 0xd8010000 /* stfd %fr0,0(%r1) */ 195#define LFD_FR0_0R1 0xc8010000 /* lfd %fr0,0(%r1) */ 196#define LI_R12_0 0x39800000 /* li %r12,0 */ 197#define STVX_VR0_R12_R0 0x7c0c01ce /* stvx %v0,%r12,%r0 */ 198#define LVX_VR0_R12_R0 0x7c0c00ce /* lvx %v0,%r12,%r0 */ 199#define MTLR_R0 0x7c0803a6 /* mtlr %r0 */ 200#define BLR 0x4e800020 /* blr */ 201 202/* Since .opd is an array of descriptors and each entry will end up 203 with identical R_PPC64_RELATIVE relocs, there is really no need to 204 propagate .opd relocs; The dynamic linker should be taught to 205 relocate .opd without reloc entries. */ 206#ifndef NO_OPD_RELOCS 207#define NO_OPD_RELOCS 0 208#endif 209 210#define ONES(n) (((bfd_vma) 1 << ((n) - 1) << 1) - 1) 211 212/* Relocation HOWTO's. */ 213static reloc_howto_type *ppc64_elf_howto_table[(int) R_PPC64_max]; 214 215static reloc_howto_type ppc64_elf_howto_raw[] = { 216 /* This reloc does nothing. */ 217 HOWTO (R_PPC64_NONE, /* type */ 218 0, /* rightshift */ 219 2, /* size (0 = byte, 1 = short, 2 = long) */ 220 32, /* bitsize */ 221 FALSE, /* pc_relative */ 222 0, /* bitpos */ 223 complain_overflow_dont, /* complain_on_overflow */ 224 bfd_elf_generic_reloc, /* special_function */ 225 "R_PPC64_NONE", /* name */ 226 FALSE, /* partial_inplace */ 227 0, /* src_mask */ 228 0, /* dst_mask */ 229 FALSE), /* pcrel_offset */ 230 231 /* A standard 32 bit relocation. */ 232 HOWTO (R_PPC64_ADDR32, /* type */ 233 0, /* rightshift */ 234 2, /* size (0 = byte, 1 = short, 2 = long) */ 235 32, /* bitsize */ 236 FALSE, /* pc_relative */ 237 0, /* bitpos */ 238 complain_overflow_bitfield, /* complain_on_overflow */ 239 bfd_elf_generic_reloc, /* special_function */ 240 "R_PPC64_ADDR32", /* name */ 241 FALSE, /* partial_inplace */ 242 0, /* src_mask */ 243 0xffffffff, /* dst_mask */ 244 FALSE), /* pcrel_offset */ 245 246 /* An absolute 26 bit branch; the lower two bits must be zero. 247 FIXME: we don't check that, we just clear them. */ 248 HOWTO (R_PPC64_ADDR24, /* type */ 249 0, /* rightshift */ 250 2, /* size (0 = byte, 1 = short, 2 = long) */ 251 26, /* bitsize */ 252 FALSE, /* pc_relative */ 253 0, /* bitpos */ 254 complain_overflow_bitfield, /* complain_on_overflow */ 255 bfd_elf_generic_reloc, /* special_function */ 256 "R_PPC64_ADDR24", /* name */ 257 FALSE, /* partial_inplace */ 258 0, /* src_mask */ 259 0x03fffffc, /* dst_mask */ 260 FALSE), /* pcrel_offset */ 261 262 /* A standard 16 bit relocation. */ 263 HOWTO (R_PPC64_ADDR16, /* type */ 264 0, /* rightshift */ 265 1, /* size (0 = byte, 1 = short, 2 = long) */ 266 16, /* bitsize */ 267 FALSE, /* pc_relative */ 268 0, /* bitpos */ 269 complain_overflow_bitfield, /* complain_on_overflow */ 270 bfd_elf_generic_reloc, /* special_function */ 271 "R_PPC64_ADDR16", /* name */ 272 FALSE, /* partial_inplace */ 273 0, /* src_mask */ 274 0xffff, /* dst_mask */ 275 FALSE), /* pcrel_offset */ 276 277 /* A 16 bit relocation without overflow. */ 278 HOWTO (R_PPC64_ADDR16_LO, /* type */ 279 0, /* rightshift */ 280 1, /* size (0 = byte, 1 = short, 2 = long) */ 281 16, /* bitsize */ 282 FALSE, /* pc_relative */ 283 0, /* bitpos */ 284 complain_overflow_dont,/* complain_on_overflow */ 285 bfd_elf_generic_reloc, /* special_function */ 286 "R_PPC64_ADDR16_LO", /* name */ 287 FALSE, /* partial_inplace */ 288 0, /* src_mask */ 289 0xffff, /* dst_mask */ 290 FALSE), /* pcrel_offset */ 291 292 /* Bits 16-31 of an address. */ 293 HOWTO (R_PPC64_ADDR16_HI, /* type */ 294 16, /* rightshift */ 295 1, /* size (0 = byte, 1 = short, 2 = long) */ 296 16, /* bitsize */ 297 FALSE, /* pc_relative */ 298 0, /* bitpos */ 299 complain_overflow_dont, /* complain_on_overflow */ 300 bfd_elf_generic_reloc, /* special_function */ 301 "R_PPC64_ADDR16_HI", /* name */ 302 FALSE, /* partial_inplace */ 303 0, /* src_mask */ 304 0xffff, /* dst_mask */ 305 FALSE), /* pcrel_offset */ 306 307 /* Bits 16-31 of an address, plus 1 if the contents of the low 16 308 bits, treated as a signed number, is negative. */ 309 HOWTO (R_PPC64_ADDR16_HA, /* type */ 310 16, /* rightshift */ 311 1, /* size (0 = byte, 1 = short, 2 = long) */ 312 16, /* bitsize */ 313 FALSE, /* pc_relative */ 314 0, /* bitpos */ 315 complain_overflow_dont, /* complain_on_overflow */ 316 ppc64_elf_ha_reloc, /* special_function */ 317 "R_PPC64_ADDR16_HA", /* name */ 318 FALSE, /* partial_inplace */ 319 0, /* src_mask */ 320 0xffff, /* dst_mask */ 321 FALSE), /* pcrel_offset */ 322 323 /* An absolute 16 bit branch; the lower two bits must be zero. 324 FIXME: we don't check that, we just clear them. */ 325 HOWTO (R_PPC64_ADDR14, /* type */ 326 0, /* rightshift */ 327 2, /* size (0 = byte, 1 = short, 2 = long) */ 328 16, /* bitsize */ 329 FALSE, /* pc_relative */ 330 0, /* bitpos */ 331 complain_overflow_bitfield, /* complain_on_overflow */ 332 ppc64_elf_branch_reloc, /* special_function */ 333 "R_PPC64_ADDR14", /* name */ 334 FALSE, /* partial_inplace */ 335 0, /* src_mask */ 336 0x0000fffc, /* dst_mask */ 337 FALSE), /* pcrel_offset */ 338 339 /* An absolute 16 bit branch, for which bit 10 should be set to 340 indicate that the branch is expected to be taken. The lower two 341 bits must be zero. */ 342 HOWTO (R_PPC64_ADDR14_BRTAKEN, /* type */ 343 0, /* rightshift */ 344 2, /* size (0 = byte, 1 = short, 2 = long) */ 345 16, /* bitsize */ 346 FALSE, /* pc_relative */ 347 0, /* bitpos */ 348 complain_overflow_bitfield, /* complain_on_overflow */ 349 ppc64_elf_brtaken_reloc, /* special_function */ 350 "R_PPC64_ADDR14_BRTAKEN",/* name */ 351 FALSE, /* partial_inplace */ 352 0, /* src_mask */ 353 0x0000fffc, /* dst_mask */ 354 FALSE), /* pcrel_offset */ 355 356 /* An absolute 16 bit branch, for which bit 10 should be set to 357 indicate that the branch is not expected to be taken. The lower 358 two bits must be zero. */ 359 HOWTO (R_PPC64_ADDR14_BRNTAKEN, /* type */ 360 0, /* rightshift */ 361 2, /* size (0 = byte, 1 = short, 2 = long) */ 362 16, /* bitsize */ 363 FALSE, /* pc_relative */ 364 0, /* bitpos */ 365 complain_overflow_bitfield, /* complain_on_overflow */ 366 ppc64_elf_brtaken_reloc, /* special_function */ 367 "R_PPC64_ADDR14_BRNTAKEN",/* name */ 368 FALSE, /* partial_inplace */ 369 0, /* src_mask */ 370 0x0000fffc, /* dst_mask */ 371 FALSE), /* pcrel_offset */ 372 373 /* A relative 26 bit branch; the lower two bits must be zero. */ 374 HOWTO (R_PPC64_REL24, /* type */ 375 0, /* rightshift */ 376 2, /* size (0 = byte, 1 = short, 2 = long) */ 377 26, /* bitsize */ 378 TRUE, /* pc_relative */ 379 0, /* bitpos */ 380 complain_overflow_signed, /* complain_on_overflow */ 381 ppc64_elf_branch_reloc, /* special_function */ 382 "R_PPC64_REL24", /* name */ 383 FALSE, /* partial_inplace */ 384 0, /* src_mask */ 385 0x03fffffc, /* dst_mask */ 386 TRUE), /* pcrel_offset */ 387 388 /* A relative 16 bit branch; the lower two bits must be zero. */ 389 HOWTO (R_PPC64_REL14, /* type */ 390 0, /* rightshift */ 391 2, /* size (0 = byte, 1 = short, 2 = long) */ 392 16, /* bitsize */ 393 TRUE, /* pc_relative */ 394 0, /* bitpos */ 395 complain_overflow_signed, /* complain_on_overflow */ 396 ppc64_elf_branch_reloc, /* special_function */ 397 "R_PPC64_REL14", /* name */ 398 FALSE, /* partial_inplace */ 399 0, /* src_mask */ 400 0x0000fffc, /* dst_mask */ 401 TRUE), /* pcrel_offset */ 402 403 /* A relative 16 bit branch. Bit 10 should be set to indicate that 404 the branch is expected to be taken. The lower two bits must be 405 zero. */ 406 HOWTO (R_PPC64_REL14_BRTAKEN, /* type */ 407 0, /* rightshift */ 408 2, /* size (0 = byte, 1 = short, 2 = long) */ 409 16, /* bitsize */ 410 TRUE, /* pc_relative */ 411 0, /* bitpos */ 412 complain_overflow_signed, /* complain_on_overflow */ 413 ppc64_elf_brtaken_reloc, /* special_function */ 414 "R_PPC64_REL14_BRTAKEN", /* name */ 415 FALSE, /* partial_inplace */ 416 0, /* src_mask */ 417 0x0000fffc, /* dst_mask */ 418 TRUE), /* pcrel_offset */ 419 420 /* A relative 16 bit branch. Bit 10 should be set to indicate that 421 the branch is not expected to be taken. The lower two bits must 422 be zero. */ 423 HOWTO (R_PPC64_REL14_BRNTAKEN, /* type */ 424 0, /* rightshift */ 425 2, /* size (0 = byte, 1 = short, 2 = long) */ 426 16, /* bitsize */ 427 TRUE, /* pc_relative */ 428 0, /* bitpos */ 429 complain_overflow_signed, /* complain_on_overflow */ 430 ppc64_elf_brtaken_reloc, /* special_function */ 431 "R_PPC64_REL14_BRNTAKEN",/* name */ 432 FALSE, /* partial_inplace */ 433 0, /* src_mask */ 434 0x0000fffc, /* dst_mask */ 435 TRUE), /* pcrel_offset */ 436 437 /* Like R_PPC64_ADDR16, but referring to the GOT table entry for the 438 symbol. */ 439 HOWTO (R_PPC64_GOT16, /* type */ 440 0, /* rightshift */ 441 1, /* size (0 = byte, 1 = short, 2 = long) */ 442 16, /* bitsize */ 443 FALSE, /* pc_relative */ 444 0, /* bitpos */ 445 complain_overflow_signed, /* complain_on_overflow */ 446 ppc64_elf_unhandled_reloc, /* special_function */ 447 "R_PPC64_GOT16", /* name */ 448 FALSE, /* partial_inplace */ 449 0, /* src_mask */ 450 0xffff, /* dst_mask */ 451 FALSE), /* pcrel_offset */ 452 453 /* Like R_PPC64_ADDR16_LO, but referring to the GOT table entry for 454 the symbol. */ 455 HOWTO (R_PPC64_GOT16_LO, /* type */ 456 0, /* rightshift */ 457 1, /* size (0 = byte, 1 = short, 2 = long) */ 458 16, /* bitsize */ 459 FALSE, /* pc_relative */ 460 0, /* bitpos */ 461 complain_overflow_dont, /* complain_on_overflow */ 462 ppc64_elf_unhandled_reloc, /* special_function */ 463 "R_PPC64_GOT16_LO", /* name */ 464 FALSE, /* partial_inplace */ 465 0, /* src_mask */ 466 0xffff, /* dst_mask */ 467 FALSE), /* pcrel_offset */ 468 469 /* Like R_PPC64_ADDR16_HI, but referring to the GOT table entry for 470 the symbol. */ 471 HOWTO (R_PPC64_GOT16_HI, /* type */ 472 16, /* rightshift */ 473 1, /* size (0 = byte, 1 = short, 2 = long) */ 474 16, /* bitsize */ 475 FALSE, /* pc_relative */ 476 0, /* bitpos */ 477 complain_overflow_dont,/* complain_on_overflow */ 478 ppc64_elf_unhandled_reloc, /* special_function */ 479 "R_PPC64_GOT16_HI", /* name */ 480 FALSE, /* partial_inplace */ 481 0, /* src_mask */ 482 0xffff, /* dst_mask */ 483 FALSE), /* pcrel_offset */ 484 485 /* Like R_PPC64_ADDR16_HA, but referring to the GOT table entry for 486 the symbol. */ 487 HOWTO (R_PPC64_GOT16_HA, /* type */ 488 16, /* rightshift */ 489 1, /* size (0 = byte, 1 = short, 2 = long) */ 490 16, /* bitsize */ 491 FALSE, /* pc_relative */ 492 0, /* bitpos */ 493 complain_overflow_dont,/* complain_on_overflow */ 494 ppc64_elf_unhandled_reloc, /* special_function */ 495 "R_PPC64_GOT16_HA", /* name */ 496 FALSE, /* partial_inplace */ 497 0, /* src_mask */ 498 0xffff, /* dst_mask */ 499 FALSE), /* pcrel_offset */ 500 501 /* This is used only by the dynamic linker. The symbol should exist 502 both in the object being run and in some shared library. The 503 dynamic linker copies the data addressed by the symbol from the 504 shared library into the object, because the object being 505 run has to have the data at some particular address. */ 506 HOWTO (R_PPC64_COPY, /* type */ 507 0, /* rightshift */ 508 0, /* this one is variable size */ 509 0, /* bitsize */ 510 FALSE, /* pc_relative */ 511 0, /* bitpos */ 512 complain_overflow_dont, /* complain_on_overflow */ 513 ppc64_elf_unhandled_reloc, /* special_function */ 514 "R_PPC64_COPY", /* name */ 515 FALSE, /* partial_inplace */ 516 0, /* src_mask */ 517 0, /* dst_mask */ 518 FALSE), /* pcrel_offset */ 519 520 /* Like R_PPC64_ADDR64, but used when setting global offset table 521 entries. */ 522 HOWTO (R_PPC64_GLOB_DAT, /* type */ 523 0, /* rightshift */ 524 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 525 64, /* bitsize */ 526 FALSE, /* pc_relative */ 527 0, /* bitpos */ 528 complain_overflow_dont, /* complain_on_overflow */ 529 ppc64_elf_unhandled_reloc, /* special_function */ 530 "R_PPC64_GLOB_DAT", /* name */ 531 FALSE, /* partial_inplace */ 532 0, /* src_mask */ 533 ONES (64), /* dst_mask */ 534 FALSE), /* pcrel_offset */ 535 536 /* Created by the link editor. Marks a procedure linkage table 537 entry for a symbol. */ 538 HOWTO (R_PPC64_JMP_SLOT, /* type */ 539 0, /* rightshift */ 540 0, /* size (0 = byte, 1 = short, 2 = long) */ 541 0, /* bitsize */ 542 FALSE, /* pc_relative */ 543 0, /* bitpos */ 544 complain_overflow_dont, /* complain_on_overflow */ 545 ppc64_elf_unhandled_reloc, /* special_function */ 546 "R_PPC64_JMP_SLOT", /* name */ 547 FALSE, /* partial_inplace */ 548 0, /* src_mask */ 549 0, /* dst_mask */ 550 FALSE), /* pcrel_offset */ 551 552 /* Used only by the dynamic linker. When the object is run, this 553 doubleword64 is set to the load address of the object, plus the 554 addend. */ 555 HOWTO (R_PPC64_RELATIVE, /* type */ 556 0, /* rightshift */ 557 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 558 64, /* bitsize */ 559 FALSE, /* pc_relative */ 560 0, /* bitpos */ 561 complain_overflow_dont, /* complain_on_overflow */ 562 bfd_elf_generic_reloc, /* special_function */ 563 "R_PPC64_RELATIVE", /* name */ 564 FALSE, /* partial_inplace */ 565 0, /* src_mask */ 566 ONES (64), /* dst_mask */ 567 FALSE), /* pcrel_offset */ 568 569 /* Like R_PPC64_ADDR32, but may be unaligned. */ 570 HOWTO (R_PPC64_UADDR32, /* type */ 571 0, /* rightshift */ 572 2, /* size (0 = byte, 1 = short, 2 = long) */ 573 32, /* bitsize */ 574 FALSE, /* pc_relative */ 575 0, /* bitpos */ 576 complain_overflow_bitfield, /* complain_on_overflow */ 577 bfd_elf_generic_reloc, /* special_function */ 578 "R_PPC64_UADDR32", /* name */ 579 FALSE, /* partial_inplace */ 580 0, /* src_mask */ 581 0xffffffff, /* dst_mask */ 582 FALSE), /* pcrel_offset */ 583 584 /* Like R_PPC64_ADDR16, but may be unaligned. */ 585 HOWTO (R_PPC64_UADDR16, /* type */ 586 0, /* rightshift */ 587 1, /* size (0 = byte, 1 = short, 2 = long) */ 588 16, /* bitsize */ 589 FALSE, /* pc_relative */ 590 0, /* bitpos */ 591 complain_overflow_bitfield, /* complain_on_overflow */ 592 bfd_elf_generic_reloc, /* special_function */ 593 "R_PPC64_UADDR16", /* name */ 594 FALSE, /* partial_inplace */ 595 0, /* src_mask */ 596 0xffff, /* dst_mask */ 597 FALSE), /* pcrel_offset */ 598 599 /* 32-bit PC relative. */ 600 HOWTO (R_PPC64_REL32, /* type */ 601 0, /* rightshift */ 602 2, /* size (0 = byte, 1 = short, 2 = long) */ 603 32, /* bitsize */ 604 TRUE, /* pc_relative */ 605 0, /* bitpos */ 606 /* FIXME: Verify. Was complain_overflow_bitfield. */ 607 complain_overflow_signed, /* complain_on_overflow */ 608 bfd_elf_generic_reloc, /* special_function */ 609 "R_PPC64_REL32", /* name */ 610 FALSE, /* partial_inplace */ 611 0, /* src_mask */ 612 0xffffffff, /* dst_mask */ 613 TRUE), /* pcrel_offset */ 614 615 /* 32-bit relocation to the symbol's procedure linkage table. */ 616 HOWTO (R_PPC64_PLT32, /* type */ 617 0, /* rightshift */ 618 2, /* size (0 = byte, 1 = short, 2 = long) */ 619 32, /* bitsize */ 620 FALSE, /* pc_relative */ 621 0, /* bitpos */ 622 complain_overflow_bitfield, /* complain_on_overflow */ 623 ppc64_elf_unhandled_reloc, /* special_function */ 624 "R_PPC64_PLT32", /* name */ 625 FALSE, /* partial_inplace */ 626 0, /* src_mask */ 627 0xffffffff, /* dst_mask */ 628 FALSE), /* pcrel_offset */ 629 630 /* 32-bit PC relative relocation to the symbol's procedure linkage table. 631 FIXME: R_PPC64_PLTREL32 not supported. */ 632 HOWTO (R_PPC64_PLTREL32, /* type */ 633 0, /* rightshift */ 634 2, /* size (0 = byte, 1 = short, 2 = long) */ 635 32, /* bitsize */ 636 TRUE, /* pc_relative */ 637 0, /* bitpos */ 638 complain_overflow_signed, /* complain_on_overflow */ 639 bfd_elf_generic_reloc, /* special_function */ 640 "R_PPC64_PLTREL32", /* name */ 641 FALSE, /* partial_inplace */ 642 0, /* src_mask */ 643 0xffffffff, /* dst_mask */ 644 TRUE), /* pcrel_offset */ 645 646 /* Like R_PPC64_ADDR16_LO, but referring to the PLT table entry for 647 the symbol. */ 648 HOWTO (R_PPC64_PLT16_LO, /* type */ 649 0, /* rightshift */ 650 1, /* size (0 = byte, 1 = short, 2 = long) */ 651 16, /* bitsize */ 652 FALSE, /* pc_relative */ 653 0, /* bitpos */ 654 complain_overflow_dont, /* complain_on_overflow */ 655 ppc64_elf_unhandled_reloc, /* special_function */ 656 "R_PPC64_PLT16_LO", /* name */ 657 FALSE, /* partial_inplace */ 658 0, /* src_mask */ 659 0xffff, /* dst_mask */ 660 FALSE), /* pcrel_offset */ 661 662 /* Like R_PPC64_ADDR16_HI, but referring to the PLT table entry for 663 the symbol. */ 664 HOWTO (R_PPC64_PLT16_HI, /* type */ 665 16, /* rightshift */ 666 1, /* size (0 = byte, 1 = short, 2 = long) */ 667 16, /* bitsize */ 668 FALSE, /* pc_relative */ 669 0, /* bitpos */ 670 complain_overflow_dont, /* complain_on_overflow */ 671 ppc64_elf_unhandled_reloc, /* special_function */ 672 "R_PPC64_PLT16_HI", /* name */ 673 FALSE, /* partial_inplace */ 674 0, /* src_mask */ 675 0xffff, /* dst_mask */ 676 FALSE), /* pcrel_offset */ 677 678 /* Like R_PPC64_ADDR16_HA, but referring to the PLT table entry for 679 the symbol. */ 680 HOWTO (R_PPC64_PLT16_HA, /* type */ 681 16, /* rightshift */ 682 1, /* size (0 = byte, 1 = short, 2 = long) */ 683 16, /* bitsize */ 684 FALSE, /* pc_relative */ 685 0, /* bitpos */ 686 complain_overflow_dont, /* complain_on_overflow */ 687 ppc64_elf_unhandled_reloc, /* special_function */ 688 "R_PPC64_PLT16_HA", /* name */ 689 FALSE, /* partial_inplace */ 690 0, /* src_mask */ 691 0xffff, /* dst_mask */ 692 FALSE), /* pcrel_offset */ 693 694 /* 16-bit section relative relocation. */ 695 HOWTO (R_PPC64_SECTOFF, /* type */ 696 0, /* rightshift */ 697 1, /* size (0 = byte, 1 = short, 2 = long) */ 698 16, /* bitsize */ 699 FALSE, /* pc_relative */ 700 0, /* bitpos */ 701 complain_overflow_bitfield, /* complain_on_overflow */ 702 ppc64_elf_sectoff_reloc, /* special_function */ 703 "R_PPC64_SECTOFF", /* name */ 704 FALSE, /* partial_inplace */ 705 0, /* src_mask */ 706 0xffff, /* dst_mask */ 707 FALSE), /* pcrel_offset */ 708 709 /* Like R_PPC64_SECTOFF, but no overflow warning. */ 710 HOWTO (R_PPC64_SECTOFF_LO, /* type */ 711 0, /* rightshift */ 712 1, /* size (0 = byte, 1 = short, 2 = long) */ 713 16, /* bitsize */ 714 FALSE, /* pc_relative */ 715 0, /* bitpos */ 716 complain_overflow_dont, /* complain_on_overflow */ 717 ppc64_elf_sectoff_reloc, /* special_function */ 718 "R_PPC64_SECTOFF_LO", /* name */ 719 FALSE, /* partial_inplace */ 720 0, /* src_mask */ 721 0xffff, /* dst_mask */ 722 FALSE), /* pcrel_offset */ 723 724 /* 16-bit upper half section relative relocation. */ 725 HOWTO (R_PPC64_SECTOFF_HI, /* type */ 726 16, /* rightshift */ 727 1, /* size (0 = byte, 1 = short, 2 = long) */ 728 16, /* bitsize */ 729 FALSE, /* pc_relative */ 730 0, /* bitpos */ 731 complain_overflow_dont, /* complain_on_overflow */ 732 ppc64_elf_sectoff_reloc, /* special_function */ 733 "R_PPC64_SECTOFF_HI", /* name */ 734 FALSE, /* partial_inplace */ 735 0, /* src_mask */ 736 0xffff, /* dst_mask */ 737 FALSE), /* pcrel_offset */ 738 739 /* 16-bit upper half adjusted section relative relocation. */ 740 HOWTO (R_PPC64_SECTOFF_HA, /* type */ 741 16, /* rightshift */ 742 1, /* size (0 = byte, 1 = short, 2 = long) */ 743 16, /* bitsize */ 744 FALSE, /* pc_relative */ 745 0, /* bitpos */ 746 complain_overflow_dont, /* complain_on_overflow */ 747 ppc64_elf_sectoff_ha_reloc, /* special_function */ 748 "R_PPC64_SECTOFF_HA", /* name */ 749 FALSE, /* partial_inplace */ 750 0, /* src_mask */ 751 0xffff, /* dst_mask */ 752 FALSE), /* pcrel_offset */ 753 754 /* Like R_PPC64_REL24 without touching the two least significant bits. */ 755 HOWTO (R_PPC64_REL30, /* type */ 756 2, /* rightshift */ 757 2, /* size (0 = byte, 1 = short, 2 = long) */ 758 30, /* bitsize */ 759 TRUE, /* pc_relative */ 760 0, /* bitpos */ 761 complain_overflow_dont, /* complain_on_overflow */ 762 bfd_elf_generic_reloc, /* special_function */ 763 "R_PPC64_REL30", /* name */ 764 FALSE, /* partial_inplace */ 765 0, /* src_mask */ 766 0xfffffffc, /* dst_mask */ 767 TRUE), /* pcrel_offset */ 768 769 /* Relocs in the 64-bit PowerPC ELF ABI, not in the 32-bit ABI. */ 770 771 /* A standard 64-bit relocation. */ 772 HOWTO (R_PPC64_ADDR64, /* type */ 773 0, /* rightshift */ 774 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 775 64, /* bitsize */ 776 FALSE, /* pc_relative */ 777 0, /* bitpos */ 778 complain_overflow_dont, /* complain_on_overflow */ 779 bfd_elf_generic_reloc, /* special_function */ 780 "R_PPC64_ADDR64", /* name */ 781 FALSE, /* partial_inplace */ 782 0, /* src_mask */ 783 ONES (64), /* dst_mask */ 784 FALSE), /* pcrel_offset */ 785 786 /* The bits 32-47 of an address. */ 787 HOWTO (R_PPC64_ADDR16_HIGHER, /* type */ 788 32, /* rightshift */ 789 1, /* size (0 = byte, 1 = short, 2 = long) */ 790 16, /* bitsize */ 791 FALSE, /* pc_relative */ 792 0, /* bitpos */ 793 complain_overflow_dont, /* complain_on_overflow */ 794 bfd_elf_generic_reloc, /* special_function */ 795 "R_PPC64_ADDR16_HIGHER", /* name */ 796 FALSE, /* partial_inplace */ 797 0, /* src_mask */ 798 0xffff, /* dst_mask */ 799 FALSE), /* pcrel_offset */ 800 801 /* The bits 32-47 of an address, plus 1 if the contents of the low 802 16 bits, treated as a signed number, is negative. */ 803 HOWTO (R_PPC64_ADDR16_HIGHERA, /* type */ 804 32, /* rightshift */ 805 1, /* size (0 = byte, 1 = short, 2 = long) */ 806 16, /* bitsize */ 807 FALSE, /* pc_relative */ 808 0, /* bitpos */ 809 complain_overflow_dont, /* complain_on_overflow */ 810 ppc64_elf_ha_reloc, /* special_function */ 811 "R_PPC64_ADDR16_HIGHERA", /* name */ 812 FALSE, /* partial_inplace */ 813 0, /* src_mask */ 814 0xffff, /* dst_mask */ 815 FALSE), /* pcrel_offset */ 816 817 /* The bits 48-63 of an address. */ 818 HOWTO (R_PPC64_ADDR16_HIGHEST,/* type */ 819 48, /* rightshift */ 820 1, /* size (0 = byte, 1 = short, 2 = long) */ 821 16, /* bitsize */ 822 FALSE, /* pc_relative */ 823 0, /* bitpos */ 824 complain_overflow_dont, /* complain_on_overflow */ 825 bfd_elf_generic_reloc, /* special_function */ 826 "R_PPC64_ADDR16_HIGHEST", /* name */ 827 FALSE, /* partial_inplace */ 828 0, /* src_mask */ 829 0xffff, /* dst_mask */ 830 FALSE), /* pcrel_offset */ 831 832 /* The bits 48-63 of an address, plus 1 if the contents of the low 833 16 bits, treated as a signed number, is negative. */ 834 HOWTO (R_PPC64_ADDR16_HIGHESTA,/* type */ 835 48, /* rightshift */ 836 1, /* size (0 = byte, 1 = short, 2 = long) */ 837 16, /* bitsize */ 838 FALSE, /* pc_relative */ 839 0, /* bitpos */ 840 complain_overflow_dont, /* complain_on_overflow */ 841 ppc64_elf_ha_reloc, /* special_function */ 842 "R_PPC64_ADDR16_HIGHESTA", /* name */ 843 FALSE, /* partial_inplace */ 844 0, /* src_mask */ 845 0xffff, /* dst_mask */ 846 FALSE), /* pcrel_offset */ 847 848 /* Like ADDR64, but may be unaligned. */ 849 HOWTO (R_PPC64_UADDR64, /* type */ 850 0, /* rightshift */ 851 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 852 64, /* bitsize */ 853 FALSE, /* pc_relative */ 854 0, /* bitpos */ 855 complain_overflow_dont, /* complain_on_overflow */ 856 bfd_elf_generic_reloc, /* special_function */ 857 "R_PPC64_UADDR64", /* name */ 858 FALSE, /* partial_inplace */ 859 0, /* src_mask */ 860 ONES (64), /* dst_mask */ 861 FALSE), /* pcrel_offset */ 862 863 /* 64-bit relative relocation. */ 864 HOWTO (R_PPC64_REL64, /* type */ 865 0, /* rightshift */ 866 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 867 64, /* bitsize */ 868 TRUE, /* pc_relative */ 869 0, /* bitpos */ 870 complain_overflow_dont, /* complain_on_overflow */ 871 bfd_elf_generic_reloc, /* special_function */ 872 "R_PPC64_REL64", /* name */ 873 FALSE, /* partial_inplace */ 874 0, /* src_mask */ 875 ONES (64), /* dst_mask */ 876 TRUE), /* pcrel_offset */ 877 878 /* 64-bit relocation to the symbol's procedure linkage table. */ 879 HOWTO (R_PPC64_PLT64, /* type */ 880 0, /* rightshift */ 881 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 882 64, /* bitsize */ 883 FALSE, /* pc_relative */ 884 0, /* bitpos */ 885 complain_overflow_dont, /* complain_on_overflow */ 886 ppc64_elf_unhandled_reloc, /* special_function */ 887 "R_PPC64_PLT64", /* name */ 888 FALSE, /* partial_inplace */ 889 0, /* src_mask */ 890 ONES (64), /* dst_mask */ 891 FALSE), /* pcrel_offset */ 892 893 /* 64-bit PC relative relocation to the symbol's procedure linkage 894 table. */ 895 /* FIXME: R_PPC64_PLTREL64 not supported. */ 896 HOWTO (R_PPC64_PLTREL64, /* type */ 897 0, /* rightshift */ 898 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 899 64, /* bitsize */ 900 TRUE, /* pc_relative */ 901 0, /* bitpos */ 902 complain_overflow_dont, /* complain_on_overflow */ 903 ppc64_elf_unhandled_reloc, /* special_function */ 904 "R_PPC64_PLTREL64", /* name */ 905 FALSE, /* partial_inplace */ 906 0, /* src_mask */ 907 ONES (64), /* dst_mask */ 908 TRUE), /* pcrel_offset */ 909 910 /* 16 bit TOC-relative relocation. */ 911 912 /* R_PPC64_TOC16 47 half16* S + A - .TOC. */ 913 HOWTO (R_PPC64_TOC16, /* type */ 914 0, /* rightshift */ 915 1, /* size (0 = byte, 1 = short, 2 = long) */ 916 16, /* bitsize */ 917 FALSE, /* pc_relative */ 918 0, /* bitpos */ 919 complain_overflow_signed, /* complain_on_overflow */ 920 ppc64_elf_toc_reloc, /* special_function */ 921 "R_PPC64_TOC16", /* name */ 922 FALSE, /* partial_inplace */ 923 0, /* src_mask */ 924 0xffff, /* dst_mask */ 925 FALSE), /* pcrel_offset */ 926 927 /* 16 bit TOC-relative relocation without overflow. */ 928 929 /* R_PPC64_TOC16_LO 48 half16 #lo (S + A - .TOC.) */ 930 HOWTO (R_PPC64_TOC16_LO, /* type */ 931 0, /* rightshift */ 932 1, /* size (0 = byte, 1 = short, 2 = long) */ 933 16, /* bitsize */ 934 FALSE, /* pc_relative */ 935 0, /* bitpos */ 936 complain_overflow_dont, /* complain_on_overflow */ 937 ppc64_elf_toc_reloc, /* special_function */ 938 "R_PPC64_TOC16_LO", /* name */ 939 FALSE, /* partial_inplace */ 940 0, /* src_mask */ 941 0xffff, /* dst_mask */ 942 FALSE), /* pcrel_offset */ 943 944 /* 16 bit TOC-relative relocation, high 16 bits. */ 945 946 /* R_PPC64_TOC16_HI 49 half16 #hi (S + A - .TOC.) */ 947 HOWTO (R_PPC64_TOC16_HI, /* type */ 948 16, /* rightshift */ 949 1, /* size (0 = byte, 1 = short, 2 = long) */ 950 16, /* bitsize */ 951 FALSE, /* pc_relative */ 952 0, /* bitpos */ 953 complain_overflow_dont, /* complain_on_overflow */ 954 ppc64_elf_toc_reloc, /* special_function */ 955 "R_PPC64_TOC16_HI", /* name */ 956 FALSE, /* partial_inplace */ 957 0, /* src_mask */ 958 0xffff, /* dst_mask */ 959 FALSE), /* pcrel_offset */ 960 961 /* 16 bit TOC-relative relocation, high 16 bits, plus 1 if the 962 contents of the low 16 bits, treated as a signed number, is 963 negative. */ 964 965 /* R_PPC64_TOC16_HA 50 half16 #ha (S + A - .TOC.) */ 966 HOWTO (R_PPC64_TOC16_HA, /* type */ 967 16, /* rightshift */ 968 1, /* size (0 = byte, 1 = short, 2 = long) */ 969 16, /* bitsize */ 970 FALSE, /* pc_relative */ 971 0, /* bitpos */ 972 complain_overflow_dont, /* complain_on_overflow */ 973 ppc64_elf_toc_ha_reloc, /* special_function */ 974 "R_PPC64_TOC16_HA", /* name */ 975 FALSE, /* partial_inplace */ 976 0, /* src_mask */ 977 0xffff, /* dst_mask */ 978 FALSE), /* pcrel_offset */ 979 980 /* 64-bit relocation; insert value of TOC base (.TOC.). */ 981 982 /* R_PPC64_TOC 51 doubleword64 .TOC. */ 983 HOWTO (R_PPC64_TOC, /* type */ 984 0, /* rightshift */ 985 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 986 64, /* bitsize */ 987 FALSE, /* pc_relative */ 988 0, /* bitpos */ 989 complain_overflow_bitfield, /* complain_on_overflow */ 990 ppc64_elf_toc64_reloc, /* special_function */ 991 "R_PPC64_TOC", /* name */ 992 FALSE, /* partial_inplace */ 993 0, /* src_mask */ 994 ONES (64), /* dst_mask */ 995 FALSE), /* pcrel_offset */ 996 997 /* Like R_PPC64_GOT16, but also informs the link editor that the 998 value to relocate may (!) refer to a PLT entry which the link 999 editor (a) may replace with the symbol value. If the link editor 1000 is unable to fully resolve the symbol, it may (b) create a PLT 1001 entry and store the address to the new PLT entry in the GOT. 1002 This permits lazy resolution of function symbols at run time. 1003 The link editor may also skip all of this and just (c) emit a 1004 R_PPC64_GLOB_DAT to tie the symbol to the GOT entry. */ 1005 /* FIXME: R_PPC64_PLTGOT16 not implemented. */ 1006 HOWTO (R_PPC64_PLTGOT16, /* type */ 1007 0, /* rightshift */ 1008 1, /* size (0 = byte, 1 = short, 2 = long) */ 1009 16, /* bitsize */ 1010 FALSE, /* pc_relative */ 1011 0, /* bitpos */ 1012 complain_overflow_signed, /* complain_on_overflow */ 1013 ppc64_elf_unhandled_reloc, /* special_function */ 1014 "R_PPC64_PLTGOT16", /* name */ 1015 FALSE, /* partial_inplace */ 1016 0, /* src_mask */ 1017 0xffff, /* dst_mask */ 1018 FALSE), /* pcrel_offset */ 1019 1020 /* Like R_PPC64_PLTGOT16, but without overflow. */ 1021 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */ 1022 HOWTO (R_PPC64_PLTGOT16_LO, /* type */ 1023 0, /* rightshift */ 1024 1, /* size (0 = byte, 1 = short, 2 = long) */ 1025 16, /* bitsize */ 1026 FALSE, /* pc_relative */ 1027 0, /* bitpos */ 1028 complain_overflow_dont, /* complain_on_overflow */ 1029 ppc64_elf_unhandled_reloc, /* special_function */ 1030 "R_PPC64_PLTGOT16_LO", /* name */ 1031 FALSE, /* partial_inplace */ 1032 0, /* src_mask */ 1033 0xffff, /* dst_mask */ 1034 FALSE), /* pcrel_offset */ 1035 1036 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address. */ 1037 /* FIXME: R_PPC64_PLTGOT16_HI not implemented. */ 1038 HOWTO (R_PPC64_PLTGOT16_HI, /* type */ 1039 16, /* rightshift */ 1040 1, /* size (0 = byte, 1 = short, 2 = long) */ 1041 16, /* bitsize */ 1042 FALSE, /* pc_relative */ 1043 0, /* bitpos */ 1044 complain_overflow_dont, /* complain_on_overflow */ 1045 ppc64_elf_unhandled_reloc, /* special_function */ 1046 "R_PPC64_PLTGOT16_HI", /* name */ 1047 FALSE, /* partial_inplace */ 1048 0, /* src_mask */ 1049 0xffff, /* dst_mask */ 1050 FALSE), /* pcrel_offset */ 1051 1052 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address, plus 1053 1 if the contents of the low 16 bits, treated as a signed number, 1054 is negative. */ 1055 /* FIXME: R_PPC64_PLTGOT16_HA not implemented. */ 1056 HOWTO (R_PPC64_PLTGOT16_HA, /* type */ 1057 16, /* rightshift */ 1058 1, /* size (0 = byte, 1 = short, 2 = long) */ 1059 16, /* bitsize */ 1060 FALSE, /* pc_relative */ 1061 0, /* bitpos */ 1062 complain_overflow_dont,/* complain_on_overflow */ 1063 ppc64_elf_unhandled_reloc, /* special_function */ 1064 "R_PPC64_PLTGOT16_HA", /* name */ 1065 FALSE, /* partial_inplace */ 1066 0, /* src_mask */ 1067 0xffff, /* dst_mask */ 1068 FALSE), /* pcrel_offset */ 1069 1070 /* Like R_PPC64_ADDR16, but for instructions with a DS field. */ 1071 HOWTO (R_PPC64_ADDR16_DS, /* type */ 1072 0, /* rightshift */ 1073 1, /* size (0 = byte, 1 = short, 2 = long) */ 1074 16, /* bitsize */ 1075 FALSE, /* pc_relative */ 1076 0, /* bitpos */ 1077 complain_overflow_bitfield, /* complain_on_overflow */ 1078 bfd_elf_generic_reloc, /* special_function */ 1079 "R_PPC64_ADDR16_DS", /* name */ 1080 FALSE, /* partial_inplace */ 1081 0, /* src_mask */ 1082 0xfffc, /* dst_mask */ 1083 FALSE), /* pcrel_offset */ 1084 1085 /* Like R_PPC64_ADDR16_LO, but for instructions with a DS field. */ 1086 HOWTO (R_PPC64_ADDR16_LO_DS, /* type */ 1087 0, /* rightshift */ 1088 1, /* size (0 = byte, 1 = short, 2 = long) */ 1089 16, /* bitsize */ 1090 FALSE, /* pc_relative */ 1091 0, /* bitpos */ 1092 complain_overflow_dont,/* complain_on_overflow */ 1093 bfd_elf_generic_reloc, /* special_function */ 1094 "R_PPC64_ADDR16_LO_DS",/* name */ 1095 FALSE, /* partial_inplace */ 1096 0, /* src_mask */ 1097 0xfffc, /* dst_mask */ 1098 FALSE), /* pcrel_offset */ 1099 1100 /* Like R_PPC64_GOT16, but for instructions with a DS field. */ 1101 HOWTO (R_PPC64_GOT16_DS, /* type */ 1102 0, /* rightshift */ 1103 1, /* size (0 = byte, 1 = short, 2 = long) */ 1104 16, /* bitsize */ 1105 FALSE, /* pc_relative */ 1106 0, /* bitpos */ 1107 complain_overflow_signed, /* complain_on_overflow */ 1108 ppc64_elf_unhandled_reloc, /* special_function */ 1109 "R_PPC64_GOT16_DS", /* name */ 1110 FALSE, /* partial_inplace */ 1111 0, /* src_mask */ 1112 0xfffc, /* dst_mask */ 1113 FALSE), /* pcrel_offset */ 1114 1115 /* Like R_PPC64_GOT16_LO, but for instructions with a DS field. */ 1116 HOWTO (R_PPC64_GOT16_LO_DS, /* type */ 1117 0, /* rightshift */ 1118 1, /* size (0 = byte, 1 = short, 2 = long) */ 1119 16, /* bitsize */ 1120 FALSE, /* pc_relative */ 1121 0, /* bitpos */ 1122 complain_overflow_dont, /* complain_on_overflow */ 1123 ppc64_elf_unhandled_reloc, /* special_function */ 1124 "R_PPC64_GOT16_LO_DS", /* name */ 1125 FALSE, /* partial_inplace */ 1126 0, /* src_mask */ 1127 0xfffc, /* dst_mask */ 1128 FALSE), /* pcrel_offset */ 1129 1130 /* Like R_PPC64_PLT16_LO, but for instructions with a DS field. */ 1131 HOWTO (R_PPC64_PLT16_LO_DS, /* type */ 1132 0, /* rightshift */ 1133 1, /* size (0 = byte, 1 = short, 2 = long) */ 1134 16, /* bitsize */ 1135 FALSE, /* pc_relative */ 1136 0, /* bitpos */ 1137 complain_overflow_dont, /* complain_on_overflow */ 1138 ppc64_elf_unhandled_reloc, /* special_function */ 1139 "R_PPC64_PLT16_LO_DS", /* name */ 1140 FALSE, /* partial_inplace */ 1141 0, /* src_mask */ 1142 0xfffc, /* dst_mask */ 1143 FALSE), /* pcrel_offset */ 1144 1145 /* Like R_PPC64_SECTOFF, but for instructions with a DS field. */ 1146 HOWTO (R_PPC64_SECTOFF_DS, /* type */ 1147 0, /* rightshift */ 1148 1, /* size (0 = byte, 1 = short, 2 = long) */ 1149 16, /* bitsize */ 1150 FALSE, /* pc_relative */ 1151 0, /* bitpos */ 1152 complain_overflow_bitfield, /* complain_on_overflow */ 1153 ppc64_elf_sectoff_reloc, /* special_function */ 1154 "R_PPC64_SECTOFF_DS", /* name */ 1155 FALSE, /* partial_inplace */ 1156 0, /* src_mask */ 1157 0xfffc, /* dst_mask */ 1158 FALSE), /* pcrel_offset */ 1159 1160 /* Like R_PPC64_SECTOFF_LO, but for instructions with a DS field. */ 1161 HOWTO (R_PPC64_SECTOFF_LO_DS, /* type */ 1162 0, /* rightshift */ 1163 1, /* size (0 = byte, 1 = short, 2 = long) */ 1164 16, /* bitsize */ 1165 FALSE, /* pc_relative */ 1166 0, /* bitpos */ 1167 complain_overflow_dont, /* complain_on_overflow */ 1168 ppc64_elf_sectoff_reloc, /* special_function */ 1169 "R_PPC64_SECTOFF_LO_DS",/* name */ 1170 FALSE, /* partial_inplace */ 1171 0, /* src_mask */ 1172 0xfffc, /* dst_mask */ 1173 FALSE), /* pcrel_offset */ 1174 1175 /* Like R_PPC64_TOC16, but for instructions with a DS field. */ 1176 HOWTO (R_PPC64_TOC16_DS, /* type */ 1177 0, /* rightshift */ 1178 1, /* size (0 = byte, 1 = short, 2 = long) */ 1179 16, /* bitsize */ 1180 FALSE, /* pc_relative */ 1181 0, /* bitpos */ 1182 complain_overflow_signed, /* complain_on_overflow */ 1183 ppc64_elf_toc_reloc, /* special_function */ 1184 "R_PPC64_TOC16_DS", /* name */ 1185 FALSE, /* partial_inplace */ 1186 0, /* src_mask */ 1187 0xfffc, /* dst_mask */ 1188 FALSE), /* pcrel_offset */ 1189 1190 /* Like R_PPC64_TOC16_LO, but for instructions with a DS field. */ 1191 HOWTO (R_PPC64_TOC16_LO_DS, /* type */ 1192 0, /* rightshift */ 1193 1, /* size (0 = byte, 1 = short, 2 = long) */ 1194 16, /* bitsize */ 1195 FALSE, /* pc_relative */ 1196 0, /* bitpos */ 1197 complain_overflow_dont, /* complain_on_overflow */ 1198 ppc64_elf_toc_reloc, /* special_function */ 1199 "R_PPC64_TOC16_LO_DS", /* name */ 1200 FALSE, /* partial_inplace */ 1201 0, /* src_mask */ 1202 0xfffc, /* dst_mask */ 1203 FALSE), /* pcrel_offset */ 1204 1205 /* Like R_PPC64_PLTGOT16, but for instructions with a DS field. */ 1206 /* FIXME: R_PPC64_PLTGOT16_DS not implemented. */ 1207 HOWTO (R_PPC64_PLTGOT16_DS, /* type */ 1208 0, /* rightshift */ 1209 1, /* size (0 = byte, 1 = short, 2 = long) */ 1210 16, /* bitsize */ 1211 FALSE, /* pc_relative */ 1212 0, /* bitpos */ 1213 complain_overflow_signed, /* complain_on_overflow */ 1214 ppc64_elf_unhandled_reloc, /* special_function */ 1215 "R_PPC64_PLTGOT16_DS", /* name */ 1216 FALSE, /* partial_inplace */ 1217 0, /* src_mask */ 1218 0xfffc, /* dst_mask */ 1219 FALSE), /* pcrel_offset */ 1220 1221 /* Like R_PPC64_PLTGOT16_LO, but for instructions with a DS field. */ 1222 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */ 1223 HOWTO (R_PPC64_PLTGOT16_LO_DS,/* type */ 1224 0, /* rightshift */ 1225 1, /* size (0 = byte, 1 = short, 2 = long) */ 1226 16, /* bitsize */ 1227 FALSE, /* pc_relative */ 1228 0, /* bitpos */ 1229 complain_overflow_dont, /* complain_on_overflow */ 1230 ppc64_elf_unhandled_reloc, /* special_function */ 1231 "R_PPC64_PLTGOT16_LO_DS",/* name */ 1232 FALSE, /* partial_inplace */ 1233 0, /* src_mask */ 1234 0xfffc, /* dst_mask */ 1235 FALSE), /* pcrel_offset */ 1236 1237 /* Marker reloc for TLS. */ 1238 HOWTO (R_PPC64_TLS, 1239 0, /* rightshift */ 1240 2, /* size (0 = byte, 1 = short, 2 = long) */ 1241 32, /* bitsize */ 1242 FALSE, /* pc_relative */ 1243 0, /* bitpos */ 1244 complain_overflow_dont, /* complain_on_overflow */ 1245 bfd_elf_generic_reloc, /* special_function */ 1246 "R_PPC64_TLS", /* name */ 1247 FALSE, /* partial_inplace */ 1248 0, /* src_mask */ 1249 0, /* dst_mask */ 1250 FALSE), /* pcrel_offset */ 1251 1252 /* Computes the load module index of the load module that contains the 1253 definition of its TLS sym. */ 1254 HOWTO (R_PPC64_DTPMOD64, 1255 0, /* rightshift */ 1256 4, /* size (0 = byte, 1 = short, 2 = long) */ 1257 64, /* bitsize */ 1258 FALSE, /* pc_relative */ 1259 0, /* bitpos */ 1260 complain_overflow_dont, /* complain_on_overflow */ 1261 ppc64_elf_unhandled_reloc, /* special_function */ 1262 "R_PPC64_DTPMOD64", /* name */ 1263 FALSE, /* partial_inplace */ 1264 0, /* src_mask */ 1265 ONES (64), /* dst_mask */ 1266 FALSE), /* pcrel_offset */ 1267 1268 /* Computes a dtv-relative displacement, the difference between the value 1269 of sym+add and the base address of the thread-local storage block that 1270 contains the definition of sym, minus 0x8000. */ 1271 HOWTO (R_PPC64_DTPREL64, 1272 0, /* rightshift */ 1273 4, /* size (0 = byte, 1 = short, 2 = long) */ 1274 64, /* bitsize */ 1275 FALSE, /* pc_relative */ 1276 0, /* bitpos */ 1277 complain_overflow_dont, /* complain_on_overflow */ 1278 ppc64_elf_unhandled_reloc, /* special_function */ 1279 "R_PPC64_DTPREL64", /* name */ 1280 FALSE, /* partial_inplace */ 1281 0, /* src_mask */ 1282 ONES (64), /* dst_mask */ 1283 FALSE), /* pcrel_offset */ 1284 1285 /* A 16 bit dtprel reloc. */ 1286 HOWTO (R_PPC64_DTPREL16, 1287 0, /* rightshift */ 1288 1, /* size (0 = byte, 1 = short, 2 = long) */ 1289 16, /* bitsize */ 1290 FALSE, /* pc_relative */ 1291 0, /* bitpos */ 1292 complain_overflow_signed, /* complain_on_overflow */ 1293 ppc64_elf_unhandled_reloc, /* special_function */ 1294 "R_PPC64_DTPREL16", /* name */ 1295 FALSE, /* partial_inplace */ 1296 0, /* src_mask */ 1297 0xffff, /* dst_mask */ 1298 FALSE), /* pcrel_offset */ 1299 1300 /* Like DTPREL16, but no overflow. */ 1301 HOWTO (R_PPC64_DTPREL16_LO, 1302 0, /* rightshift */ 1303 1, /* size (0 = byte, 1 = short, 2 = long) */ 1304 16, /* bitsize */ 1305 FALSE, /* pc_relative */ 1306 0, /* bitpos */ 1307 complain_overflow_dont, /* complain_on_overflow */ 1308 ppc64_elf_unhandled_reloc, /* special_function */ 1309 "R_PPC64_DTPREL16_LO", /* name */ 1310 FALSE, /* partial_inplace */ 1311 0, /* src_mask */ 1312 0xffff, /* dst_mask */ 1313 FALSE), /* pcrel_offset */ 1314 1315 /* Like DTPREL16_LO, but next higher group of 16 bits. */ 1316 HOWTO (R_PPC64_DTPREL16_HI, 1317 16, /* rightshift */ 1318 1, /* size (0 = byte, 1 = short, 2 = long) */ 1319 16, /* bitsize */ 1320 FALSE, /* pc_relative */ 1321 0, /* bitpos */ 1322 complain_overflow_dont, /* complain_on_overflow */ 1323 ppc64_elf_unhandled_reloc, /* special_function */ 1324 "R_PPC64_DTPREL16_HI", /* name */ 1325 FALSE, /* partial_inplace */ 1326 0, /* src_mask */ 1327 0xffff, /* dst_mask */ 1328 FALSE), /* pcrel_offset */ 1329 1330 /* Like DTPREL16_HI, but adjust for low 16 bits. */ 1331 HOWTO (R_PPC64_DTPREL16_HA, 1332 16, /* rightshift */ 1333 1, /* size (0 = byte, 1 = short, 2 = long) */ 1334 16, /* bitsize */ 1335 FALSE, /* pc_relative */ 1336 0, /* bitpos */ 1337 complain_overflow_dont, /* complain_on_overflow */ 1338 ppc64_elf_unhandled_reloc, /* special_function */ 1339 "R_PPC64_DTPREL16_HA", /* name */ 1340 FALSE, /* partial_inplace */ 1341 0, /* src_mask */ 1342 0xffff, /* dst_mask */ 1343 FALSE), /* pcrel_offset */ 1344 1345 /* Like DTPREL16_HI, but next higher group of 16 bits. */ 1346 HOWTO (R_PPC64_DTPREL16_HIGHER, 1347 32, /* rightshift */ 1348 1, /* size (0 = byte, 1 = short, 2 = long) */ 1349 16, /* bitsize */ 1350 FALSE, /* pc_relative */ 1351 0, /* bitpos */ 1352 complain_overflow_dont, /* complain_on_overflow */ 1353 ppc64_elf_unhandled_reloc, /* special_function */ 1354 "R_PPC64_DTPREL16_HIGHER", /* name */ 1355 FALSE, /* partial_inplace */ 1356 0, /* src_mask */ 1357 0xffff, /* dst_mask */ 1358 FALSE), /* pcrel_offset */ 1359 1360 /* Like DTPREL16_HIGHER, but adjust for low 16 bits. */ 1361 HOWTO (R_PPC64_DTPREL16_HIGHERA, 1362 32, /* rightshift */ 1363 1, /* size (0 = byte, 1 = short, 2 = long) */ 1364 16, /* bitsize */ 1365 FALSE, /* pc_relative */ 1366 0, /* bitpos */ 1367 complain_overflow_dont, /* complain_on_overflow */ 1368 ppc64_elf_unhandled_reloc, /* special_function */ 1369 "R_PPC64_DTPREL16_HIGHERA", /* name */ 1370 FALSE, /* partial_inplace */ 1371 0, /* src_mask */ 1372 0xffff, /* dst_mask */ 1373 FALSE), /* pcrel_offset */ 1374 1375 /* Like DTPREL16_HIGHER, but next higher group of 16 bits. */ 1376 HOWTO (R_PPC64_DTPREL16_HIGHEST, 1377 48, /* rightshift */ 1378 1, /* size (0 = byte, 1 = short, 2 = long) */ 1379 16, /* bitsize */ 1380 FALSE, /* pc_relative */ 1381 0, /* bitpos */ 1382 complain_overflow_dont, /* complain_on_overflow */ 1383 ppc64_elf_unhandled_reloc, /* special_function */ 1384 "R_PPC64_DTPREL16_HIGHEST", /* name */ 1385 FALSE, /* partial_inplace */ 1386 0, /* src_mask */ 1387 0xffff, /* dst_mask */ 1388 FALSE), /* pcrel_offset */ 1389 1390 /* Like DTPREL16_HIGHEST, but adjust for low 16 bits. */ 1391 HOWTO (R_PPC64_DTPREL16_HIGHESTA, 1392 48, /* rightshift */ 1393 1, /* size (0 = byte, 1 = short, 2 = long) */ 1394 16, /* bitsize */ 1395 FALSE, /* pc_relative */ 1396 0, /* bitpos */ 1397 complain_overflow_dont, /* complain_on_overflow */ 1398 ppc64_elf_unhandled_reloc, /* special_function */ 1399 "R_PPC64_DTPREL16_HIGHESTA", /* name */ 1400 FALSE, /* partial_inplace */ 1401 0, /* src_mask */ 1402 0xffff, /* dst_mask */ 1403 FALSE), /* pcrel_offset */ 1404 1405 /* Like DTPREL16, but for insns with a DS field. */ 1406 HOWTO (R_PPC64_DTPREL16_DS, 1407 0, /* rightshift */ 1408 1, /* size (0 = byte, 1 = short, 2 = long) */ 1409 16, /* bitsize */ 1410 FALSE, /* pc_relative */ 1411 0, /* bitpos */ 1412 complain_overflow_signed, /* complain_on_overflow */ 1413 ppc64_elf_unhandled_reloc, /* special_function */ 1414 "R_PPC64_DTPREL16_DS", /* name */ 1415 FALSE, /* partial_inplace */ 1416 0, /* src_mask */ 1417 0xfffc, /* dst_mask */ 1418 FALSE), /* pcrel_offset */ 1419 1420 /* Like DTPREL16_DS, but no overflow. */ 1421 HOWTO (R_PPC64_DTPREL16_LO_DS, 1422 0, /* rightshift */ 1423 1, /* size (0 = byte, 1 = short, 2 = long) */ 1424 16, /* bitsize */ 1425 FALSE, /* pc_relative */ 1426 0, /* bitpos */ 1427 complain_overflow_dont, /* complain_on_overflow */ 1428 ppc64_elf_unhandled_reloc, /* special_function */ 1429 "R_PPC64_DTPREL16_LO_DS", /* name */ 1430 FALSE, /* partial_inplace */ 1431 0, /* src_mask */ 1432 0xfffc, /* dst_mask */ 1433 FALSE), /* pcrel_offset */ 1434 1435 /* Computes a tp-relative displacement, the difference between the value of 1436 sym+add and the value of the thread pointer (r13). */ 1437 HOWTO (R_PPC64_TPREL64, 1438 0, /* rightshift */ 1439 4, /* size (0 = byte, 1 = short, 2 = long) */ 1440 64, /* bitsize */ 1441 FALSE, /* pc_relative */ 1442 0, /* bitpos */ 1443 complain_overflow_dont, /* complain_on_overflow */ 1444 ppc64_elf_unhandled_reloc, /* special_function */ 1445 "R_PPC64_TPREL64", /* name */ 1446 FALSE, /* partial_inplace */ 1447 0, /* src_mask */ 1448 ONES (64), /* dst_mask */ 1449 FALSE), /* pcrel_offset */ 1450 1451 /* A 16 bit tprel reloc. */ 1452 HOWTO (R_PPC64_TPREL16, 1453 0, /* rightshift */ 1454 1, /* size (0 = byte, 1 = short, 2 = long) */ 1455 16, /* bitsize */ 1456 FALSE, /* pc_relative */ 1457 0, /* bitpos */ 1458 complain_overflow_signed, /* complain_on_overflow */ 1459 ppc64_elf_unhandled_reloc, /* special_function */ 1460 "R_PPC64_TPREL16", /* name */ 1461 FALSE, /* partial_inplace */ 1462 0, /* src_mask */ 1463 0xffff, /* dst_mask */ 1464 FALSE), /* pcrel_offset */ 1465 1466 /* Like TPREL16, but no overflow. */ 1467 HOWTO (R_PPC64_TPREL16_LO, 1468 0, /* rightshift */ 1469 1, /* size (0 = byte, 1 = short, 2 = long) */ 1470 16, /* bitsize */ 1471 FALSE, /* pc_relative */ 1472 0, /* bitpos */ 1473 complain_overflow_dont, /* complain_on_overflow */ 1474 ppc64_elf_unhandled_reloc, /* special_function */ 1475 "R_PPC64_TPREL16_LO", /* name */ 1476 FALSE, /* partial_inplace */ 1477 0, /* src_mask */ 1478 0xffff, /* dst_mask */ 1479 FALSE), /* pcrel_offset */ 1480 1481 /* Like TPREL16_LO, but next higher group of 16 bits. */ 1482 HOWTO (R_PPC64_TPREL16_HI, 1483 16, /* rightshift */ 1484 1, /* size (0 = byte, 1 = short, 2 = long) */ 1485 16, /* bitsize */ 1486 FALSE, /* pc_relative */ 1487 0, /* bitpos */ 1488 complain_overflow_dont, /* complain_on_overflow */ 1489 ppc64_elf_unhandled_reloc, /* special_function */ 1490 "R_PPC64_TPREL16_HI", /* name */ 1491 FALSE, /* partial_inplace */ 1492 0, /* src_mask */ 1493 0xffff, /* dst_mask */ 1494 FALSE), /* pcrel_offset */ 1495 1496 /* Like TPREL16_HI, but adjust for low 16 bits. */ 1497 HOWTO (R_PPC64_TPREL16_HA, 1498 16, /* rightshift */ 1499 1, /* size (0 = byte, 1 = short, 2 = long) */ 1500 16, /* bitsize */ 1501 FALSE, /* pc_relative */ 1502 0, /* bitpos */ 1503 complain_overflow_dont, /* complain_on_overflow */ 1504 ppc64_elf_unhandled_reloc, /* special_function */ 1505 "R_PPC64_TPREL16_HA", /* name */ 1506 FALSE, /* partial_inplace */ 1507 0, /* src_mask */ 1508 0xffff, /* dst_mask */ 1509 FALSE), /* pcrel_offset */ 1510 1511 /* Like TPREL16_HI, but next higher group of 16 bits. */ 1512 HOWTO (R_PPC64_TPREL16_HIGHER, 1513 32, /* rightshift */ 1514 1, /* size (0 = byte, 1 = short, 2 = long) */ 1515 16, /* bitsize */ 1516 FALSE, /* pc_relative */ 1517 0, /* bitpos */ 1518 complain_overflow_dont, /* complain_on_overflow */ 1519 ppc64_elf_unhandled_reloc, /* special_function */ 1520 "R_PPC64_TPREL16_HIGHER", /* name */ 1521 FALSE, /* partial_inplace */ 1522 0, /* src_mask */ 1523 0xffff, /* dst_mask */ 1524 FALSE), /* pcrel_offset */ 1525 1526 /* Like TPREL16_HIGHER, but adjust for low 16 bits. */ 1527 HOWTO (R_PPC64_TPREL16_HIGHERA, 1528 32, /* rightshift */ 1529 1, /* size (0 = byte, 1 = short, 2 = long) */ 1530 16, /* bitsize */ 1531 FALSE, /* pc_relative */ 1532 0, /* bitpos */ 1533 complain_overflow_dont, /* complain_on_overflow */ 1534 ppc64_elf_unhandled_reloc, /* special_function */ 1535 "R_PPC64_TPREL16_HIGHERA", /* name */ 1536 FALSE, /* partial_inplace */ 1537 0, /* src_mask */ 1538 0xffff, /* dst_mask */ 1539 FALSE), /* pcrel_offset */ 1540 1541 /* Like TPREL16_HIGHER, but next higher group of 16 bits. */ 1542 HOWTO (R_PPC64_TPREL16_HIGHEST, 1543 48, /* rightshift */ 1544 1, /* size (0 = byte, 1 = short, 2 = long) */ 1545 16, /* bitsize */ 1546 FALSE, /* pc_relative */ 1547 0, /* bitpos */ 1548 complain_overflow_dont, /* complain_on_overflow */ 1549 ppc64_elf_unhandled_reloc, /* special_function */ 1550 "R_PPC64_TPREL16_HIGHEST", /* name */ 1551 FALSE, /* partial_inplace */ 1552 0, /* src_mask */ 1553 0xffff, /* dst_mask */ 1554 FALSE), /* pcrel_offset */ 1555 1556 /* Like TPREL16_HIGHEST, but adjust for low 16 bits. */ 1557 HOWTO (R_PPC64_TPREL16_HIGHESTA, 1558 48, /* rightshift */ 1559 1, /* size (0 = byte, 1 = short, 2 = long) */ 1560 16, /* bitsize */ 1561 FALSE, /* pc_relative */ 1562 0, /* bitpos */ 1563 complain_overflow_dont, /* complain_on_overflow */ 1564 ppc64_elf_unhandled_reloc, /* special_function */ 1565 "R_PPC64_TPREL16_HIGHESTA", /* name */ 1566 FALSE, /* partial_inplace */ 1567 0, /* src_mask */ 1568 0xffff, /* dst_mask */ 1569 FALSE), /* pcrel_offset */ 1570 1571 /* Like TPREL16, but for insns with a DS field. */ 1572 HOWTO (R_PPC64_TPREL16_DS, 1573 0, /* rightshift */ 1574 1, /* size (0 = byte, 1 = short, 2 = long) */ 1575 16, /* bitsize */ 1576 FALSE, /* pc_relative */ 1577 0, /* bitpos */ 1578 complain_overflow_signed, /* complain_on_overflow */ 1579 ppc64_elf_unhandled_reloc, /* special_function */ 1580 "R_PPC64_TPREL16_DS", /* name */ 1581 FALSE, /* partial_inplace */ 1582 0, /* src_mask */ 1583 0xfffc, /* dst_mask */ 1584 FALSE), /* pcrel_offset */ 1585 1586 /* Like TPREL16_DS, but no overflow. */ 1587 HOWTO (R_PPC64_TPREL16_LO_DS, 1588 0, /* rightshift */ 1589 1, /* size (0 = byte, 1 = short, 2 = long) */ 1590 16, /* bitsize */ 1591 FALSE, /* pc_relative */ 1592 0, /* bitpos */ 1593 complain_overflow_dont, /* complain_on_overflow */ 1594 ppc64_elf_unhandled_reloc, /* special_function */ 1595 "R_PPC64_TPREL16_LO_DS", /* name */ 1596 FALSE, /* partial_inplace */ 1597 0, /* src_mask */ 1598 0xfffc, /* dst_mask */ 1599 FALSE), /* pcrel_offset */ 1600 1601 /* Allocates two contiguous entries in the GOT to hold a tls_index structure, 1602 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset 1603 to the first entry relative to the TOC base (r2). */ 1604 HOWTO (R_PPC64_GOT_TLSGD16, 1605 0, /* rightshift */ 1606 1, /* size (0 = byte, 1 = short, 2 = long) */ 1607 16, /* bitsize */ 1608 FALSE, /* pc_relative */ 1609 0, /* bitpos */ 1610 complain_overflow_signed, /* complain_on_overflow */ 1611 ppc64_elf_unhandled_reloc, /* special_function */ 1612 "R_PPC64_GOT_TLSGD16", /* name */ 1613 FALSE, /* partial_inplace */ 1614 0, /* src_mask */ 1615 0xffff, /* dst_mask */ 1616 FALSE), /* pcrel_offset */ 1617 1618 /* Like GOT_TLSGD16, but no overflow. */ 1619 HOWTO (R_PPC64_GOT_TLSGD16_LO, 1620 0, /* rightshift */ 1621 1, /* size (0 = byte, 1 = short, 2 = long) */ 1622 16, /* bitsize */ 1623 FALSE, /* pc_relative */ 1624 0, /* bitpos */ 1625 complain_overflow_dont, /* complain_on_overflow */ 1626 ppc64_elf_unhandled_reloc, /* special_function */ 1627 "R_PPC64_GOT_TLSGD16_LO", /* name */ 1628 FALSE, /* partial_inplace */ 1629 0, /* src_mask */ 1630 0xffff, /* dst_mask */ 1631 FALSE), /* pcrel_offset */ 1632 1633 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */ 1634 HOWTO (R_PPC64_GOT_TLSGD16_HI, 1635 16, /* rightshift */ 1636 1, /* size (0 = byte, 1 = short, 2 = long) */ 1637 16, /* bitsize */ 1638 FALSE, /* pc_relative */ 1639 0, /* bitpos */ 1640 complain_overflow_dont, /* complain_on_overflow */ 1641 ppc64_elf_unhandled_reloc, /* special_function */ 1642 "R_PPC64_GOT_TLSGD16_HI", /* name */ 1643 FALSE, /* partial_inplace */ 1644 0, /* src_mask */ 1645 0xffff, /* dst_mask */ 1646 FALSE), /* pcrel_offset */ 1647 1648 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */ 1649 HOWTO (R_PPC64_GOT_TLSGD16_HA, 1650 16, /* rightshift */ 1651 1, /* size (0 = byte, 1 = short, 2 = long) */ 1652 16, /* bitsize */ 1653 FALSE, /* pc_relative */ 1654 0, /* bitpos */ 1655 complain_overflow_dont, /* complain_on_overflow */ 1656 ppc64_elf_unhandled_reloc, /* special_function */ 1657 "R_PPC64_GOT_TLSGD16_HA", /* name */ 1658 FALSE, /* partial_inplace */ 1659 0, /* src_mask */ 1660 0xffff, /* dst_mask */ 1661 FALSE), /* pcrel_offset */ 1662 1663 /* Allocates two contiguous entries in the GOT to hold a tls_index structure, 1664 with values (sym+add)@dtpmod and zero, and computes the offset to the 1665 first entry relative to the TOC base (r2). */ 1666 HOWTO (R_PPC64_GOT_TLSLD16, 1667 0, /* rightshift */ 1668 1, /* size (0 = byte, 1 = short, 2 = long) */ 1669 16, /* bitsize */ 1670 FALSE, /* pc_relative */ 1671 0, /* bitpos */ 1672 complain_overflow_signed, /* complain_on_overflow */ 1673 ppc64_elf_unhandled_reloc, /* special_function */ 1674 "R_PPC64_GOT_TLSLD16", /* name */ 1675 FALSE, /* partial_inplace */ 1676 0, /* src_mask */ 1677 0xffff, /* dst_mask */ 1678 FALSE), /* pcrel_offset */ 1679 1680 /* Like GOT_TLSLD16, but no overflow. */ 1681 HOWTO (R_PPC64_GOT_TLSLD16_LO, 1682 0, /* rightshift */ 1683 1, /* size (0 = byte, 1 = short, 2 = long) */ 1684 16, /* bitsize */ 1685 FALSE, /* pc_relative */ 1686 0, /* bitpos */ 1687 complain_overflow_dont, /* complain_on_overflow */ 1688 ppc64_elf_unhandled_reloc, /* special_function */ 1689 "R_PPC64_GOT_TLSLD16_LO", /* name */ 1690 FALSE, /* partial_inplace */ 1691 0, /* src_mask */ 1692 0xffff, /* dst_mask */ 1693 FALSE), /* pcrel_offset */ 1694 1695 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */ 1696 HOWTO (R_PPC64_GOT_TLSLD16_HI, 1697 16, /* rightshift */ 1698 1, /* size (0 = byte, 1 = short, 2 = long) */ 1699 16, /* bitsize */ 1700 FALSE, /* pc_relative */ 1701 0, /* bitpos */ 1702 complain_overflow_dont, /* complain_on_overflow */ 1703 ppc64_elf_unhandled_reloc, /* special_function */ 1704 "R_PPC64_GOT_TLSLD16_HI", /* name */ 1705 FALSE, /* partial_inplace */ 1706 0, /* src_mask */ 1707 0xffff, /* dst_mask */ 1708 FALSE), /* pcrel_offset */ 1709 1710 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */ 1711 HOWTO (R_PPC64_GOT_TLSLD16_HA, 1712 16, /* rightshift */ 1713 1, /* size (0 = byte, 1 = short, 2 = long) */ 1714 16, /* bitsize */ 1715 FALSE, /* pc_relative */ 1716 0, /* bitpos */ 1717 complain_overflow_dont, /* complain_on_overflow */ 1718 ppc64_elf_unhandled_reloc, /* special_function */ 1719 "R_PPC64_GOT_TLSLD16_HA", /* name */ 1720 FALSE, /* partial_inplace */ 1721 0, /* src_mask */ 1722 0xffff, /* dst_mask */ 1723 FALSE), /* pcrel_offset */ 1724 1725 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes 1726 the offset to the entry relative to the TOC base (r2). */ 1727 HOWTO (R_PPC64_GOT_DTPREL16_DS, 1728 0, /* rightshift */ 1729 1, /* size (0 = byte, 1 = short, 2 = long) */ 1730 16, /* bitsize */ 1731 FALSE, /* pc_relative */ 1732 0, /* bitpos */ 1733 complain_overflow_signed, /* complain_on_overflow */ 1734 ppc64_elf_unhandled_reloc, /* special_function */ 1735 "R_PPC64_GOT_DTPREL16_DS", /* name */ 1736 FALSE, /* partial_inplace */ 1737 0, /* src_mask */ 1738 0xfffc, /* dst_mask */ 1739 FALSE), /* pcrel_offset */ 1740 1741 /* Like GOT_DTPREL16_DS, but no overflow. */ 1742 HOWTO (R_PPC64_GOT_DTPREL16_LO_DS, 1743 0, /* rightshift */ 1744 1, /* size (0 = byte, 1 = short, 2 = long) */ 1745 16, /* bitsize */ 1746 FALSE, /* pc_relative */ 1747 0, /* bitpos */ 1748 complain_overflow_dont, /* complain_on_overflow */ 1749 ppc64_elf_unhandled_reloc, /* special_function */ 1750 "R_PPC64_GOT_DTPREL16_LO_DS", /* name */ 1751 FALSE, /* partial_inplace */ 1752 0, /* src_mask */ 1753 0xfffc, /* dst_mask */ 1754 FALSE), /* pcrel_offset */ 1755 1756 /* Like GOT_DTPREL16_LO_DS, but next higher group of 16 bits. */ 1757 HOWTO (R_PPC64_GOT_DTPREL16_HI, 1758 16, /* rightshift */ 1759 1, /* size (0 = byte, 1 = short, 2 = long) */ 1760 16, /* bitsize */ 1761 FALSE, /* pc_relative */ 1762 0, /* bitpos */ 1763 complain_overflow_dont, /* complain_on_overflow */ 1764 ppc64_elf_unhandled_reloc, /* special_function */ 1765 "R_PPC64_GOT_DTPREL16_HI", /* name */ 1766 FALSE, /* partial_inplace */ 1767 0, /* src_mask */ 1768 0xffff, /* dst_mask */ 1769 FALSE), /* pcrel_offset */ 1770 1771 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */ 1772 HOWTO (R_PPC64_GOT_DTPREL16_HA, 1773 16, /* rightshift */ 1774 1, /* size (0 = byte, 1 = short, 2 = long) */ 1775 16, /* bitsize */ 1776 FALSE, /* pc_relative */ 1777 0, /* bitpos */ 1778 complain_overflow_dont, /* complain_on_overflow */ 1779 ppc64_elf_unhandled_reloc, /* special_function */ 1780 "R_PPC64_GOT_DTPREL16_HA", /* name */ 1781 FALSE, /* partial_inplace */ 1782 0, /* src_mask */ 1783 0xffff, /* dst_mask */ 1784 FALSE), /* pcrel_offset */ 1785 1786 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the 1787 offset to the entry relative to the TOC base (r2). */ 1788 HOWTO (R_PPC64_GOT_TPREL16_DS, 1789 0, /* rightshift */ 1790 1, /* size (0 = byte, 1 = short, 2 = long) */ 1791 16, /* bitsize */ 1792 FALSE, /* pc_relative */ 1793 0, /* bitpos */ 1794 complain_overflow_signed, /* complain_on_overflow */ 1795 ppc64_elf_unhandled_reloc, /* special_function */ 1796 "R_PPC64_GOT_TPREL16_DS", /* name */ 1797 FALSE, /* partial_inplace */ 1798 0, /* src_mask */ 1799 0xfffc, /* dst_mask */ 1800 FALSE), /* pcrel_offset */ 1801 1802 /* Like GOT_TPREL16_DS, but no overflow. */ 1803 HOWTO (R_PPC64_GOT_TPREL16_LO_DS, 1804 0, /* rightshift */ 1805 1, /* size (0 = byte, 1 = short, 2 = long) */ 1806 16, /* bitsize */ 1807 FALSE, /* pc_relative */ 1808 0, /* bitpos */ 1809 complain_overflow_dont, /* complain_on_overflow */ 1810 ppc64_elf_unhandled_reloc, /* special_function */ 1811 "R_PPC64_GOT_TPREL16_LO_DS", /* name */ 1812 FALSE, /* partial_inplace */ 1813 0, /* src_mask */ 1814 0xfffc, /* dst_mask */ 1815 FALSE), /* pcrel_offset */ 1816 1817 /* Like GOT_TPREL16_LO_DS, but next higher group of 16 bits. */ 1818 HOWTO (R_PPC64_GOT_TPREL16_HI, 1819 16, /* rightshift */ 1820 1, /* size (0 = byte, 1 = short, 2 = long) */ 1821 16, /* bitsize */ 1822 FALSE, /* pc_relative */ 1823 0, /* bitpos */ 1824 complain_overflow_dont, /* complain_on_overflow */ 1825 ppc64_elf_unhandled_reloc, /* special_function */ 1826 "R_PPC64_GOT_TPREL16_HI", /* name */ 1827 FALSE, /* partial_inplace */ 1828 0, /* src_mask */ 1829 0xffff, /* dst_mask */ 1830 FALSE), /* pcrel_offset */ 1831 1832 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */ 1833 HOWTO (R_PPC64_GOT_TPREL16_HA, 1834 16, /* rightshift */ 1835 1, /* size (0 = byte, 1 = short, 2 = long) */ 1836 16, /* bitsize */ 1837 FALSE, /* pc_relative */ 1838 0, /* bitpos */ 1839 complain_overflow_dont, /* complain_on_overflow */ 1840 ppc64_elf_unhandled_reloc, /* special_function */ 1841 "R_PPC64_GOT_TPREL16_HA", /* name */ 1842 FALSE, /* partial_inplace */ 1843 0, /* src_mask */ 1844 0xffff, /* dst_mask */ 1845 FALSE), /* pcrel_offset */ 1846 1847 /* GNU extension to record C++ vtable hierarchy. */ 1848 HOWTO (R_PPC64_GNU_VTINHERIT, /* type */ 1849 0, /* rightshift */ 1850 0, /* size (0 = byte, 1 = short, 2 = long) */ 1851 0, /* bitsize */ 1852 FALSE, /* pc_relative */ 1853 0, /* bitpos */ 1854 complain_overflow_dont, /* complain_on_overflow */ 1855 NULL, /* special_function */ 1856 "R_PPC64_GNU_VTINHERIT", /* name */ 1857 FALSE, /* partial_inplace */ 1858 0, /* src_mask */ 1859 0, /* dst_mask */ 1860 FALSE), /* pcrel_offset */ 1861 1862 /* GNU extension to record C++ vtable member usage. */ 1863 HOWTO (R_PPC64_GNU_VTENTRY, /* type */ 1864 0, /* rightshift */ 1865 0, /* size (0 = byte, 1 = short, 2 = long) */ 1866 0, /* bitsize */ 1867 FALSE, /* pc_relative */ 1868 0, /* bitpos */ 1869 complain_overflow_dont, /* complain_on_overflow */ 1870 NULL, /* special_function */ 1871 "R_PPC64_GNU_VTENTRY", /* name */ 1872 FALSE, /* partial_inplace */ 1873 0, /* src_mask */ 1874 0, /* dst_mask */ 1875 FALSE), /* pcrel_offset */ 1876}; 1877 1878 1879/* Initialize the ppc64_elf_howto_table, so that linear accesses can 1880 be done. */ 1881 1882static void 1883ppc_howto_init (void) 1884{ 1885 unsigned int i, type; 1886 1887 for (i = 0; 1888 i < sizeof (ppc64_elf_howto_raw) / sizeof (ppc64_elf_howto_raw[0]); 1889 i++) 1890 { 1891 type = ppc64_elf_howto_raw[i].type; 1892 BFD_ASSERT (type < (sizeof (ppc64_elf_howto_table) 1893 / sizeof (ppc64_elf_howto_table[0]))); 1894 ppc64_elf_howto_table[type] = &ppc64_elf_howto_raw[i]; 1895 } 1896} 1897 1898static reloc_howto_type * 1899ppc64_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 1900 bfd_reloc_code_real_type code) 1901{ 1902 enum elf_ppc64_reloc_type r = R_PPC64_NONE; 1903 1904 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 1905 /* Initialize howto table if needed. */ 1906 ppc_howto_init (); 1907 1908 switch (code) 1909 { 1910 default: 1911 return NULL; 1912 1913 case BFD_RELOC_NONE: r = R_PPC64_NONE; 1914 break; 1915 case BFD_RELOC_32: r = R_PPC64_ADDR32; 1916 break; 1917 case BFD_RELOC_PPC_BA26: r = R_PPC64_ADDR24; 1918 break; 1919 case BFD_RELOC_16: r = R_PPC64_ADDR16; 1920 break; 1921 case BFD_RELOC_LO16: r = R_PPC64_ADDR16_LO; 1922 break; 1923 case BFD_RELOC_HI16: r = R_PPC64_ADDR16_HI; 1924 break; 1925 case BFD_RELOC_HI16_S: r = R_PPC64_ADDR16_HA; 1926 break; 1927 case BFD_RELOC_PPC_BA16: r = R_PPC64_ADDR14; 1928 break; 1929 case BFD_RELOC_PPC_BA16_BRTAKEN: r = R_PPC64_ADDR14_BRTAKEN; 1930 break; 1931 case BFD_RELOC_PPC_BA16_BRNTAKEN: r = R_PPC64_ADDR14_BRNTAKEN; 1932 break; 1933 case BFD_RELOC_PPC_B26: r = R_PPC64_REL24; 1934 break; 1935 case BFD_RELOC_PPC_B16: r = R_PPC64_REL14; 1936 break; 1937 case BFD_RELOC_PPC_B16_BRTAKEN: r = R_PPC64_REL14_BRTAKEN; 1938 break; 1939 case BFD_RELOC_PPC_B16_BRNTAKEN: r = R_PPC64_REL14_BRNTAKEN; 1940 break; 1941 case BFD_RELOC_16_GOTOFF: r = R_PPC64_GOT16; 1942 break; 1943 case BFD_RELOC_LO16_GOTOFF: r = R_PPC64_GOT16_LO; 1944 break; 1945 case BFD_RELOC_HI16_GOTOFF: r = R_PPC64_GOT16_HI; 1946 break; 1947 case BFD_RELOC_HI16_S_GOTOFF: r = R_PPC64_GOT16_HA; 1948 break; 1949 case BFD_RELOC_PPC_COPY: r = R_PPC64_COPY; 1950 break; 1951 case BFD_RELOC_PPC_GLOB_DAT: r = R_PPC64_GLOB_DAT; 1952 break; 1953 case BFD_RELOC_32_PCREL: r = R_PPC64_REL32; 1954 break; 1955 case BFD_RELOC_32_PLTOFF: r = R_PPC64_PLT32; 1956 break; 1957 case BFD_RELOC_32_PLT_PCREL: r = R_PPC64_PLTREL32; 1958 break; 1959 case BFD_RELOC_LO16_PLTOFF: r = R_PPC64_PLT16_LO; 1960 break; 1961 case BFD_RELOC_HI16_PLTOFF: r = R_PPC64_PLT16_HI; 1962 break; 1963 case BFD_RELOC_HI16_S_PLTOFF: r = R_PPC64_PLT16_HA; 1964 break; 1965 case BFD_RELOC_16_BASEREL: r = R_PPC64_SECTOFF; 1966 break; 1967 case BFD_RELOC_LO16_BASEREL: r = R_PPC64_SECTOFF_LO; 1968 break; 1969 case BFD_RELOC_HI16_BASEREL: r = R_PPC64_SECTOFF_HI; 1970 break; 1971 case BFD_RELOC_HI16_S_BASEREL: r = R_PPC64_SECTOFF_HA; 1972 break; 1973 case BFD_RELOC_CTOR: r = R_PPC64_ADDR64; 1974 break; 1975 case BFD_RELOC_64: r = R_PPC64_ADDR64; 1976 break; 1977 case BFD_RELOC_PPC64_HIGHER: r = R_PPC64_ADDR16_HIGHER; 1978 break; 1979 case BFD_RELOC_PPC64_HIGHER_S: r = R_PPC64_ADDR16_HIGHERA; 1980 break; 1981 case BFD_RELOC_PPC64_HIGHEST: r = R_PPC64_ADDR16_HIGHEST; 1982 break; 1983 case BFD_RELOC_PPC64_HIGHEST_S: r = R_PPC64_ADDR16_HIGHESTA; 1984 break; 1985 case BFD_RELOC_64_PCREL: r = R_PPC64_REL64; 1986 break; 1987 case BFD_RELOC_64_PLTOFF: r = R_PPC64_PLT64; 1988 break; 1989 case BFD_RELOC_64_PLT_PCREL: r = R_PPC64_PLTREL64; 1990 break; 1991 case BFD_RELOC_PPC_TOC16: r = R_PPC64_TOC16; 1992 break; 1993 case BFD_RELOC_PPC64_TOC16_LO: r = R_PPC64_TOC16_LO; 1994 break; 1995 case BFD_RELOC_PPC64_TOC16_HI: r = R_PPC64_TOC16_HI; 1996 break; 1997 case BFD_RELOC_PPC64_TOC16_HA: r = R_PPC64_TOC16_HA; 1998 break; 1999 case BFD_RELOC_PPC64_TOC: r = R_PPC64_TOC; 2000 break; 2001 case BFD_RELOC_PPC64_PLTGOT16: r = R_PPC64_PLTGOT16; 2002 break; 2003 case BFD_RELOC_PPC64_PLTGOT16_LO: r = R_PPC64_PLTGOT16_LO; 2004 break; 2005 case BFD_RELOC_PPC64_PLTGOT16_HI: r = R_PPC64_PLTGOT16_HI; 2006 break; 2007 case BFD_RELOC_PPC64_PLTGOT16_HA: r = R_PPC64_PLTGOT16_HA; 2008 break; 2009 case BFD_RELOC_PPC64_ADDR16_DS: r = R_PPC64_ADDR16_DS; 2010 break; 2011 case BFD_RELOC_PPC64_ADDR16_LO_DS: r = R_PPC64_ADDR16_LO_DS; 2012 break; 2013 case BFD_RELOC_PPC64_GOT16_DS: r = R_PPC64_GOT16_DS; 2014 break; 2015 case BFD_RELOC_PPC64_GOT16_LO_DS: r = R_PPC64_GOT16_LO_DS; 2016 break; 2017 case BFD_RELOC_PPC64_PLT16_LO_DS: r = R_PPC64_PLT16_LO_DS; 2018 break; 2019 case BFD_RELOC_PPC64_SECTOFF_DS: r = R_PPC64_SECTOFF_DS; 2020 break; 2021 case BFD_RELOC_PPC64_SECTOFF_LO_DS: r = R_PPC64_SECTOFF_LO_DS; 2022 break; 2023 case BFD_RELOC_PPC64_TOC16_DS: r = R_PPC64_TOC16_DS; 2024 break; 2025 case BFD_RELOC_PPC64_TOC16_LO_DS: r = R_PPC64_TOC16_LO_DS; 2026 break; 2027 case BFD_RELOC_PPC64_PLTGOT16_DS: r = R_PPC64_PLTGOT16_DS; 2028 break; 2029 case BFD_RELOC_PPC64_PLTGOT16_LO_DS: r = R_PPC64_PLTGOT16_LO_DS; 2030 break; 2031 case BFD_RELOC_PPC_TLS: r = R_PPC64_TLS; 2032 break; 2033 case BFD_RELOC_PPC_DTPMOD: r = R_PPC64_DTPMOD64; 2034 break; 2035 case BFD_RELOC_PPC_TPREL16: r = R_PPC64_TPREL16; 2036 break; 2037 case BFD_RELOC_PPC_TPREL16_LO: r = R_PPC64_TPREL16_LO; 2038 break; 2039 case BFD_RELOC_PPC_TPREL16_HI: r = R_PPC64_TPREL16_HI; 2040 break; 2041 case BFD_RELOC_PPC_TPREL16_HA: r = R_PPC64_TPREL16_HA; 2042 break; 2043 case BFD_RELOC_PPC_TPREL: r = R_PPC64_TPREL64; 2044 break; 2045 case BFD_RELOC_PPC_DTPREL16: r = R_PPC64_DTPREL16; 2046 break; 2047 case BFD_RELOC_PPC_DTPREL16_LO: r = R_PPC64_DTPREL16_LO; 2048 break; 2049 case BFD_RELOC_PPC_DTPREL16_HI: r = R_PPC64_DTPREL16_HI; 2050 break; 2051 case BFD_RELOC_PPC_DTPREL16_HA: r = R_PPC64_DTPREL16_HA; 2052 break; 2053 case BFD_RELOC_PPC_DTPREL: r = R_PPC64_DTPREL64; 2054 break; 2055 case BFD_RELOC_PPC_GOT_TLSGD16: r = R_PPC64_GOT_TLSGD16; 2056 break; 2057 case BFD_RELOC_PPC_GOT_TLSGD16_LO: r = R_PPC64_GOT_TLSGD16_LO; 2058 break; 2059 case BFD_RELOC_PPC_GOT_TLSGD16_HI: r = R_PPC64_GOT_TLSGD16_HI; 2060 break; 2061 case BFD_RELOC_PPC_GOT_TLSGD16_HA: r = R_PPC64_GOT_TLSGD16_HA; 2062 break; 2063 case BFD_RELOC_PPC_GOT_TLSLD16: r = R_PPC64_GOT_TLSLD16; 2064 break; 2065 case BFD_RELOC_PPC_GOT_TLSLD16_LO: r = R_PPC64_GOT_TLSLD16_LO; 2066 break; 2067 case BFD_RELOC_PPC_GOT_TLSLD16_HI: r = R_PPC64_GOT_TLSLD16_HI; 2068 break; 2069 case BFD_RELOC_PPC_GOT_TLSLD16_HA: r = R_PPC64_GOT_TLSLD16_HA; 2070 break; 2071 case BFD_RELOC_PPC_GOT_TPREL16: r = R_PPC64_GOT_TPREL16_DS; 2072 break; 2073 case BFD_RELOC_PPC_GOT_TPREL16_LO: r = R_PPC64_GOT_TPREL16_LO_DS; 2074 break; 2075 case BFD_RELOC_PPC_GOT_TPREL16_HI: r = R_PPC64_GOT_TPREL16_HI; 2076 break; 2077 case BFD_RELOC_PPC_GOT_TPREL16_HA: r = R_PPC64_GOT_TPREL16_HA; 2078 break; 2079 case BFD_RELOC_PPC_GOT_DTPREL16: r = R_PPC64_GOT_DTPREL16_DS; 2080 break; 2081 case BFD_RELOC_PPC_GOT_DTPREL16_LO: r = R_PPC64_GOT_DTPREL16_LO_DS; 2082 break; 2083 case BFD_RELOC_PPC_GOT_DTPREL16_HI: r = R_PPC64_GOT_DTPREL16_HI; 2084 break; 2085 case BFD_RELOC_PPC_GOT_DTPREL16_HA: r = R_PPC64_GOT_DTPREL16_HA; 2086 break; 2087 case BFD_RELOC_PPC64_TPREL16_DS: r = R_PPC64_TPREL16_DS; 2088 break; 2089 case BFD_RELOC_PPC64_TPREL16_LO_DS: r = R_PPC64_TPREL16_LO_DS; 2090 break; 2091 case BFD_RELOC_PPC64_TPREL16_HIGHER: r = R_PPC64_TPREL16_HIGHER; 2092 break; 2093 case BFD_RELOC_PPC64_TPREL16_HIGHERA: r = R_PPC64_TPREL16_HIGHERA; 2094 break; 2095 case BFD_RELOC_PPC64_TPREL16_HIGHEST: r = R_PPC64_TPREL16_HIGHEST; 2096 break; 2097 case BFD_RELOC_PPC64_TPREL16_HIGHESTA: r = R_PPC64_TPREL16_HIGHESTA; 2098 break; 2099 case BFD_RELOC_PPC64_DTPREL16_DS: r = R_PPC64_DTPREL16_DS; 2100 break; 2101 case BFD_RELOC_PPC64_DTPREL16_LO_DS: r = R_PPC64_DTPREL16_LO_DS; 2102 break; 2103 case BFD_RELOC_PPC64_DTPREL16_HIGHER: r = R_PPC64_DTPREL16_HIGHER; 2104 break; 2105 case BFD_RELOC_PPC64_DTPREL16_HIGHERA: r = R_PPC64_DTPREL16_HIGHERA; 2106 break; 2107 case BFD_RELOC_PPC64_DTPREL16_HIGHEST: r = R_PPC64_DTPREL16_HIGHEST; 2108 break; 2109 case BFD_RELOC_PPC64_DTPREL16_HIGHESTA: r = R_PPC64_DTPREL16_HIGHESTA; 2110 break; 2111 case BFD_RELOC_VTABLE_INHERIT: r = R_PPC64_GNU_VTINHERIT; 2112 break; 2113 case BFD_RELOC_VTABLE_ENTRY: r = R_PPC64_GNU_VTENTRY; 2114 break; 2115 } 2116 2117 return ppc64_elf_howto_table[r]; 2118}; 2119 2120static reloc_howto_type * 2121ppc64_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 2122 const char *r_name) 2123{ 2124 unsigned int i; 2125 2126 for (i = 0; 2127 i < sizeof (ppc64_elf_howto_raw) / sizeof (ppc64_elf_howto_raw[0]); 2128 i++) 2129 if (ppc64_elf_howto_raw[i].name != NULL 2130 && strcasecmp (ppc64_elf_howto_raw[i].name, r_name) == 0) 2131 return &ppc64_elf_howto_raw[i]; 2132 2133 return NULL; 2134} 2135 2136/* Set the howto pointer for a PowerPC ELF reloc. */ 2137 2138static void 2139ppc64_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, 2140 Elf_Internal_Rela *dst) 2141{ 2142 unsigned int type; 2143 2144 /* Initialize howto table if needed. */ 2145 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 2146 ppc_howto_init (); 2147 2148 type = ELF64_R_TYPE (dst->r_info); 2149 if (type >= (sizeof (ppc64_elf_howto_table) 2150 / sizeof (ppc64_elf_howto_table[0]))) 2151 { 2152 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 2153 abfd, (int) type); 2154 type = R_PPC64_NONE; 2155 } 2156 cache_ptr->howto = ppc64_elf_howto_table[type]; 2157} 2158 2159/* Handle the R_PPC64_ADDR16_HA and similar relocs. */ 2160 2161static bfd_reloc_status_type 2162ppc64_elf_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2163 void *data, asection *input_section, 2164 bfd *output_bfd, char **error_message) 2165{ 2166 /* If this is a relocatable link (output_bfd test tells us), just 2167 call the generic function. Any adjustment will be done at final 2168 link time. */ 2169 if (output_bfd != NULL) 2170 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2171 input_section, output_bfd, error_message); 2172 2173 /* Adjust the addend for sign extension of the low 16 bits. 2174 We won't actually be using the low 16 bits, so trashing them 2175 doesn't matter. */ 2176 reloc_entry->addend += 0x8000; 2177 return bfd_reloc_continue; 2178} 2179 2180static bfd_reloc_status_type 2181ppc64_elf_branch_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2182 void *data, asection *input_section, 2183 bfd *output_bfd, char **error_message) 2184{ 2185 if (output_bfd != NULL) 2186 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2187 input_section, output_bfd, error_message); 2188 2189 if (strcmp (symbol->section->name, ".opd") == 0 2190 && (symbol->section->owner->flags & DYNAMIC) == 0) 2191 { 2192 bfd_vma dest = opd_entry_value (symbol->section, 2193 symbol->value + reloc_entry->addend, 2194 NULL, NULL); 2195 if (dest != (bfd_vma) -1) 2196 reloc_entry->addend = dest - (symbol->value 2197 + symbol->section->output_section->vma 2198 + symbol->section->output_offset); 2199 } 2200 return bfd_reloc_continue; 2201} 2202 2203static bfd_reloc_status_type 2204ppc64_elf_brtaken_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2205 void *data, asection *input_section, 2206 bfd *output_bfd, char **error_message) 2207{ 2208 long insn; 2209 enum elf_ppc64_reloc_type r_type; 2210 bfd_size_type octets; 2211 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */ 2212 bfd_boolean is_power4 = FALSE; 2213 2214 /* If this is a relocatable link (output_bfd test tells us), just 2215 call the generic function. Any adjustment will be done at final 2216 link time. */ 2217 if (output_bfd != NULL) 2218 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2219 input_section, output_bfd, error_message); 2220 2221 octets = reloc_entry->address * bfd_octets_per_byte (abfd); 2222 insn = bfd_get_32 (abfd, (bfd_byte *) data + octets); 2223 insn &= ~(0x01 << 21); 2224 r_type = reloc_entry->howto->type; 2225 if (r_type == R_PPC64_ADDR14_BRTAKEN 2226 || r_type == R_PPC64_REL14_BRTAKEN) 2227 insn |= 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */ 2228 2229 if (is_power4) 2230 { 2231 /* Set 'a' bit. This is 0b00010 in BO field for branch 2232 on CR(BI) insns (BO == 001at or 011at), and 0b01000 2233 for branch on CTR insns (BO == 1a00t or 1a01t). */ 2234 if ((insn & (0x14 << 21)) == (0x04 << 21)) 2235 insn |= 0x02 << 21; 2236 else if ((insn & (0x14 << 21)) == (0x10 << 21)) 2237 insn |= 0x08 << 21; 2238 else 2239 goto out; 2240 } 2241 else 2242 { 2243 bfd_vma target = 0; 2244 bfd_vma from; 2245 2246 if (!bfd_is_com_section (symbol->section)) 2247 target = symbol->value; 2248 target += symbol->section->output_section->vma; 2249 target += symbol->section->output_offset; 2250 target += reloc_entry->addend; 2251 2252 from = (reloc_entry->address 2253 + input_section->output_offset 2254 + input_section->output_section->vma); 2255 2256 /* Invert 'y' bit if not the default. */ 2257 if ((bfd_signed_vma) (target - from) < 0) 2258 insn ^= 0x01 << 21; 2259 } 2260 bfd_put_32 (abfd, insn, (bfd_byte *) data + octets); 2261 out: 2262 return ppc64_elf_branch_reloc (abfd, reloc_entry, symbol, data, 2263 input_section, output_bfd, error_message); 2264} 2265 2266static bfd_reloc_status_type 2267ppc64_elf_sectoff_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2268 void *data, asection *input_section, 2269 bfd *output_bfd, char **error_message) 2270{ 2271 /* If this is a relocatable link (output_bfd test tells us), just 2272 call the generic function. Any adjustment will be done at final 2273 link time. */ 2274 if (output_bfd != NULL) 2275 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2276 input_section, output_bfd, error_message); 2277 2278 /* Subtract the symbol section base address. */ 2279 reloc_entry->addend -= symbol->section->output_section->vma; 2280 return bfd_reloc_continue; 2281} 2282 2283static bfd_reloc_status_type 2284ppc64_elf_sectoff_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2285 void *data, asection *input_section, 2286 bfd *output_bfd, char **error_message) 2287{ 2288 /* If this is a relocatable link (output_bfd test tells us), just 2289 call the generic function. Any adjustment will be done at final 2290 link time. */ 2291 if (output_bfd != NULL) 2292 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2293 input_section, output_bfd, error_message); 2294 2295 /* Subtract the symbol section base address. */ 2296 reloc_entry->addend -= symbol->section->output_section->vma; 2297 2298 /* Adjust the addend for sign extension of the low 16 bits. */ 2299 reloc_entry->addend += 0x8000; 2300 return bfd_reloc_continue; 2301} 2302 2303static bfd_reloc_status_type 2304ppc64_elf_toc_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2305 void *data, asection *input_section, 2306 bfd *output_bfd, char **error_message) 2307{ 2308 bfd_vma TOCstart; 2309 2310 /* If this is a relocatable link (output_bfd test tells us), just 2311 call the generic function. Any adjustment will be done at final 2312 link time. */ 2313 if (output_bfd != NULL) 2314 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2315 input_section, output_bfd, error_message); 2316 2317 TOCstart = _bfd_get_gp_value (input_section->output_section->owner); 2318 if (TOCstart == 0) 2319 TOCstart = ppc64_elf_toc (input_section->output_section->owner); 2320 2321 /* Subtract the TOC base address. */ 2322 reloc_entry->addend -= TOCstart + TOC_BASE_OFF; 2323 return bfd_reloc_continue; 2324} 2325 2326static bfd_reloc_status_type 2327ppc64_elf_toc_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2328 void *data, asection *input_section, 2329 bfd *output_bfd, char **error_message) 2330{ 2331 bfd_vma TOCstart; 2332 2333 /* If this is a relocatable link (output_bfd test tells us), just 2334 call the generic function. Any adjustment will be done at final 2335 link time. */ 2336 if (output_bfd != NULL) 2337 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2338 input_section, output_bfd, error_message); 2339 2340 TOCstart = _bfd_get_gp_value (input_section->output_section->owner); 2341 if (TOCstart == 0) 2342 TOCstart = ppc64_elf_toc (input_section->output_section->owner); 2343 2344 /* Subtract the TOC base address. */ 2345 reloc_entry->addend -= TOCstart + TOC_BASE_OFF; 2346 2347 /* Adjust the addend for sign extension of the low 16 bits. */ 2348 reloc_entry->addend += 0x8000; 2349 return bfd_reloc_continue; 2350} 2351 2352static bfd_reloc_status_type 2353ppc64_elf_toc64_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2354 void *data, asection *input_section, 2355 bfd *output_bfd, char **error_message) 2356{ 2357 bfd_vma TOCstart; 2358 bfd_size_type octets; 2359 2360 /* If this is a relocatable link (output_bfd test tells us), just 2361 call the generic function. Any adjustment will be done at final 2362 link time. */ 2363 if (output_bfd != NULL) 2364 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2365 input_section, output_bfd, error_message); 2366 2367 TOCstart = _bfd_get_gp_value (input_section->output_section->owner); 2368 if (TOCstart == 0) 2369 TOCstart = ppc64_elf_toc (input_section->output_section->owner); 2370 2371 octets = reloc_entry->address * bfd_octets_per_byte (abfd); 2372 bfd_put_64 (abfd, TOCstart + TOC_BASE_OFF, (bfd_byte *) data + octets); 2373 return bfd_reloc_ok; 2374} 2375 2376static bfd_reloc_status_type 2377ppc64_elf_unhandled_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2378 void *data, asection *input_section, 2379 bfd *output_bfd, char **error_message) 2380{ 2381 /* If this is a relocatable link (output_bfd test tells us), just 2382 call the generic function. Any adjustment will be done at final 2383 link time. */ 2384 if (output_bfd != NULL) 2385 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2386 input_section, output_bfd, error_message); 2387 2388 if (error_message != NULL) 2389 { 2390 static char buf[60]; 2391 sprintf (buf, "generic linker can't handle %s", 2392 reloc_entry->howto->name); 2393 *error_message = buf; 2394 } 2395 return bfd_reloc_dangerous; 2396} 2397 2398struct ppc64_elf_obj_tdata 2399{ 2400 struct elf_obj_tdata elf; 2401 2402 /* Shortcuts to dynamic linker sections. */ 2403 asection *got; 2404 asection *relgot; 2405 2406 /* Used during garbage collection. We attach global symbols defined 2407 on removed .opd entries to this section so that the sym is removed. */ 2408 asection *deleted_section; 2409 2410 /* TLS local dynamic got entry handling. Suppose for multiple GOT 2411 sections means we potentially need one of these for each input bfd. */ 2412 union { 2413 bfd_signed_vma refcount; 2414 bfd_vma offset; 2415 } tlsld_got; 2416 2417 /* A copy of relocs before they are modified for --emit-relocs. */ 2418 Elf_Internal_Rela *opd_relocs; 2419}; 2420 2421#define ppc64_elf_tdata(bfd) \ 2422 ((struct ppc64_elf_obj_tdata *) (bfd)->tdata.any) 2423 2424#define ppc64_tlsld_got(bfd) \ 2425 (&ppc64_elf_tdata (bfd)->tlsld_got) 2426 2427/* Override the generic function because we store some extras. */ 2428 2429static bfd_boolean 2430ppc64_elf_mkobject (bfd *abfd) 2431{ 2432 if (abfd->tdata.any == NULL) 2433 { 2434 bfd_size_type amt = sizeof (struct ppc64_elf_obj_tdata); 2435 abfd->tdata.any = bfd_zalloc (abfd, amt); 2436 if (abfd->tdata.any == NULL) 2437 return FALSE; 2438 } 2439 return bfd_elf_mkobject (abfd); 2440} 2441 2442/* Return 1 if target is one of ours. */ 2443 2444static bfd_boolean 2445is_ppc64_elf_target (const struct bfd_target *targ) 2446{ 2447 extern const bfd_target bfd_elf64_powerpc_vec; 2448 extern const bfd_target bfd_elf64_powerpcle_vec; 2449 2450 return targ == &bfd_elf64_powerpc_vec || targ == &bfd_elf64_powerpcle_vec; 2451} 2452 2453/* Fix bad default arch selected for a 64 bit input bfd when the 2454 default is 32 bit. */ 2455 2456static bfd_boolean 2457ppc64_elf_object_p (bfd *abfd) 2458{ 2459 if (abfd->arch_info->the_default && abfd->arch_info->bits_per_word == 32) 2460 { 2461 Elf_Internal_Ehdr *i_ehdr = elf_elfheader (abfd); 2462 2463 if (i_ehdr->e_ident[EI_CLASS] == ELFCLASS64) 2464 { 2465 /* Relies on arch after 32 bit default being 64 bit default. */ 2466 abfd->arch_info = abfd->arch_info->next; 2467 BFD_ASSERT (abfd->arch_info->bits_per_word == 64); 2468 } 2469 } 2470 return TRUE; 2471} 2472 2473/* Support for core dump NOTE sections. */ 2474 2475static bfd_boolean 2476ppc64_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 2477{ 2478 size_t offset, size; 2479 2480 if (note->descsz != 504) 2481 return FALSE; 2482 2483 /* pr_cursig */ 2484 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 2485 2486 /* pr_pid */ 2487 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 32); 2488 2489 /* pr_reg */ 2490 offset = 112; 2491 size = 384; 2492 2493 /* Make a ".reg/999" section. */ 2494 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 2495 size, note->descpos + offset); 2496} 2497 2498static bfd_boolean 2499ppc64_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 2500{ 2501 if (note->descsz != 136) 2502 return FALSE; 2503 2504 elf_tdata (abfd)->core_program 2505 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); 2506 elf_tdata (abfd)->core_command 2507 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); 2508 2509 return TRUE; 2510} 2511 2512static char * 2513ppc64_elf_write_core_note (bfd *abfd, char *buf, int *bufsiz, int note_type, 2514 ...) 2515{ 2516 switch (note_type) 2517 { 2518 default: 2519 return NULL; 2520 2521 case NT_PRPSINFO: 2522 { 2523 char data[136]; 2524 va_list ap; 2525 2526 va_start (ap, note_type); 2527 memset (data, 0, 40); 2528 strncpy (data + 40, va_arg (ap, const char *), 16); 2529 strncpy (data + 56, va_arg (ap, const char *), 80); 2530 va_end (ap); 2531 return elfcore_write_note (abfd, buf, bufsiz, 2532 "CORE", note_type, data, sizeof (data)); 2533 } 2534 2535 case NT_PRSTATUS: 2536 { 2537 char data[504]; 2538 va_list ap; 2539 long pid; 2540 int cursig; 2541 const void *greg; 2542 2543 va_start (ap, note_type); 2544 memset (data, 0, 112); 2545 pid = va_arg (ap, long); 2546 bfd_put_32 (abfd, pid, data + 32); 2547 cursig = va_arg (ap, int); 2548 bfd_put_16 (abfd, cursig, data + 12); 2549 greg = va_arg (ap, const void *); 2550 memcpy (data + 112, greg, 384); 2551 memset (data + 496, 0, 8); 2552 va_end (ap); 2553 return elfcore_write_note (abfd, buf, bufsiz, 2554 "CORE", note_type, data, sizeof (data)); 2555 } 2556 } 2557} 2558 2559/* Merge backend specific data from an object file to the output 2560 object file when linking. */ 2561 2562static bfd_boolean 2563ppc64_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 2564{ 2565 /* Check if we have the same endianess. */ 2566 if (ibfd->xvec->byteorder != obfd->xvec->byteorder 2567 && ibfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN 2568 && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN) 2569 { 2570 const char *msg; 2571 2572 if (bfd_big_endian (ibfd)) 2573 msg = _("%B: compiled for a big endian system " 2574 "and target is little endian"); 2575 else 2576 msg = _("%B: compiled for a little endian system " 2577 "and target is big endian"); 2578 2579 (*_bfd_error_handler) (msg, ibfd); 2580 2581 bfd_set_error (bfd_error_wrong_format); 2582 return FALSE; 2583 } 2584 2585 return TRUE; 2586} 2587 2588/* Add extra PPC sections. */ 2589 2590static const struct bfd_elf_special_section ppc64_elf_special_sections[]= 2591{ 2592 { STRING_COMMA_LEN (".plt"), 0, SHT_NOBITS, 0 }, 2593 { STRING_COMMA_LEN (".sbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, 2594 { STRING_COMMA_LEN (".sdata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2595 { STRING_COMMA_LEN (".toc"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2596 { STRING_COMMA_LEN (".toc1"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2597 { STRING_COMMA_LEN (".tocbss"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, 2598 { NULL, 0, 0, 0, 0 } 2599}; 2600 2601enum _ppc64_sec_type { 2602 sec_normal = 0, 2603 sec_opd = 1, 2604 sec_toc = 2 2605}; 2606 2607struct _ppc64_elf_section_data 2608{ 2609 struct bfd_elf_section_data elf; 2610 2611 /* An array with one entry for each opd function descriptor. */ 2612 union 2613 { 2614 /* Points to the function code section for local opd entries. */ 2615 asection **opd_func_sec; 2616 /* After editing .opd, adjust references to opd local syms. */ 2617 long *opd_adjust; 2618 2619 /* An array for toc sections, indexed by offset/8. 2620 Specifies the relocation symbol index used at a given toc offset. */ 2621 unsigned *t_symndx; 2622 } u; 2623 2624 enum _ppc64_sec_type sec_type:2; 2625 2626 /* Flag set when small branches are detected. Used to 2627 select suitable defaults for the stub group size. */ 2628 unsigned int has_14bit_branch:1; 2629}; 2630 2631#define ppc64_elf_section_data(sec) \ 2632 ((struct _ppc64_elf_section_data *) elf_section_data (sec)) 2633 2634static bfd_boolean 2635ppc64_elf_new_section_hook (bfd *abfd, asection *sec) 2636{ 2637 if (!sec->used_by_bfd) 2638 { 2639 struct _ppc64_elf_section_data *sdata; 2640 bfd_size_type amt = sizeof (*sdata); 2641 2642 sdata = bfd_zalloc (abfd, amt); 2643 if (sdata == NULL) 2644 return FALSE; 2645 sec->used_by_bfd = sdata; 2646 } 2647 2648 return _bfd_elf_new_section_hook (abfd, sec); 2649} 2650 2651static void * 2652get_opd_info (asection * sec) 2653{ 2654 if (sec != NULL 2655 && ppc64_elf_section_data (sec) != NULL 2656 && ppc64_elf_section_data (sec)->sec_type == sec_opd) 2657 return ppc64_elf_section_data (sec)->u.opd_adjust; 2658 return NULL; 2659} 2660 2661/* Parameters for the qsort hook. */ 2662static asection *synthetic_opd; 2663static bfd_boolean synthetic_relocatable; 2664 2665/* qsort comparison function for ppc64_elf_get_synthetic_symtab. */ 2666 2667static int 2668compare_symbols (const void *ap, const void *bp) 2669{ 2670 const asymbol *a = * (const asymbol **) ap; 2671 const asymbol *b = * (const asymbol **) bp; 2672 2673 /* Section symbols first. */ 2674 if ((a->flags & BSF_SECTION_SYM) && !(b->flags & BSF_SECTION_SYM)) 2675 return -1; 2676 if (!(a->flags & BSF_SECTION_SYM) && (b->flags & BSF_SECTION_SYM)) 2677 return 1; 2678 2679 /* then .opd symbols. */ 2680 if (a->section == synthetic_opd && b->section != synthetic_opd) 2681 return -1; 2682 if (a->section != synthetic_opd && b->section == synthetic_opd) 2683 return 1; 2684 2685 /* then other code symbols. */ 2686 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2687 == (SEC_CODE | SEC_ALLOC) 2688 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2689 != (SEC_CODE | SEC_ALLOC)) 2690 return -1; 2691 2692 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2693 != (SEC_CODE | SEC_ALLOC) 2694 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2695 == (SEC_CODE | SEC_ALLOC)) 2696 return 1; 2697 2698 if (synthetic_relocatable) 2699 { 2700 if (a->section->id < b->section->id) 2701 return -1; 2702 2703 if (a->section->id > b->section->id) 2704 return 1; 2705 } 2706 2707 if (a->value + a->section->vma < b->value + b->section->vma) 2708 return -1; 2709 2710 if (a->value + a->section->vma > b->value + b->section->vma) 2711 return 1; 2712 2713 /* For syms with the same value, prefer strong dynamic global function 2714 syms over other syms. */ 2715 if ((a->flags & BSF_GLOBAL) != 0 && (b->flags & BSF_GLOBAL) == 0) 2716 return -1; 2717 2718 if ((a->flags & BSF_GLOBAL) == 0 && (b->flags & BSF_GLOBAL) != 0) 2719 return 1; 2720 2721 if ((a->flags & BSF_FUNCTION) != 0 && (b->flags & BSF_FUNCTION) == 0) 2722 return -1; 2723 2724 if ((a->flags & BSF_FUNCTION) == 0 && (b->flags & BSF_FUNCTION) != 0) 2725 return 1; 2726 2727 if ((a->flags & BSF_WEAK) == 0 && (b->flags & BSF_WEAK) != 0) 2728 return -1; 2729 2730 if ((a->flags & BSF_WEAK) != 0 && (b->flags & BSF_WEAK) == 0) 2731 return 1; 2732 2733 if ((a->flags & BSF_DYNAMIC) != 0 && (b->flags & BSF_DYNAMIC) == 0) 2734 return -1; 2735 2736 if ((a->flags & BSF_DYNAMIC) == 0 && (b->flags & BSF_DYNAMIC) != 0) 2737 return 1; 2738 2739 return 0; 2740} 2741 2742/* Search SYMS for a symbol of the given VALUE. */ 2743 2744static asymbol * 2745sym_exists_at (asymbol **syms, long lo, long hi, int id, bfd_vma value) 2746{ 2747 long mid; 2748 2749 if (id == -1) 2750 { 2751 while (lo < hi) 2752 { 2753 mid = (lo + hi) >> 1; 2754 if (syms[mid]->value + syms[mid]->section->vma < value) 2755 lo = mid + 1; 2756 else if (syms[mid]->value + syms[mid]->section->vma > value) 2757 hi = mid; 2758 else 2759 return syms[mid]; 2760 } 2761 } 2762 else 2763 { 2764 while (lo < hi) 2765 { 2766 mid = (lo + hi) >> 1; 2767 if (syms[mid]->section->id < id) 2768 lo = mid + 1; 2769 else if (syms[mid]->section->id > id) 2770 hi = mid; 2771 else if (syms[mid]->value < value) 2772 lo = mid + 1; 2773 else if (syms[mid]->value > value) 2774 hi = mid; 2775 else 2776 return syms[mid]; 2777 } 2778 } 2779 return NULL; 2780} 2781 2782/* Create synthetic symbols, effectively restoring "dot-symbol" function 2783 entry syms. */ 2784 2785static long 2786ppc64_elf_get_synthetic_symtab (bfd *abfd, 2787 long static_count, asymbol **static_syms, 2788 long dyn_count, asymbol **dyn_syms, 2789 asymbol **ret) 2790{ 2791 asymbol *s; 2792 long i; 2793 long count; 2794 char *names; 2795 long symcount, codesecsym, codesecsymend, secsymend, opdsymend; 2796 asection *opd; 2797 bfd_boolean relocatable = (abfd->flags & (EXEC_P | DYNAMIC)) == 0; 2798 asymbol **syms; 2799 2800 *ret = NULL; 2801 2802 opd = bfd_get_section_by_name (abfd, ".opd"); 2803 if (opd == NULL) 2804 return 0; 2805 2806 symcount = static_count; 2807 if (!relocatable) 2808 symcount += dyn_count; 2809 if (symcount == 0) 2810 return 0; 2811 2812 syms = bfd_malloc ((symcount + 1) * sizeof (*syms)); 2813 if (syms == NULL) 2814 return -1; 2815 2816 if (!relocatable && static_count != 0 && dyn_count != 0) 2817 { 2818 /* Use both symbol tables. */ 2819 memcpy (syms, static_syms, static_count * sizeof (*syms)); 2820 memcpy (syms + static_count, dyn_syms, (dyn_count + 1) * sizeof (*syms)); 2821 } 2822 else if (!relocatable && static_count == 0) 2823 memcpy (syms, dyn_syms, (symcount + 1) * sizeof (*syms)); 2824 else 2825 memcpy (syms, static_syms, (symcount + 1) * sizeof (*syms)); 2826 2827 synthetic_opd = opd; 2828 synthetic_relocatable = relocatable; 2829 qsort (syms, symcount, sizeof (*syms), compare_symbols); 2830 2831 if (!relocatable && symcount > 1) 2832 { 2833 long j; 2834 /* Trim duplicate syms, since we may have merged the normal and 2835 dynamic symbols. Actually, we only care about syms that have 2836 different values, so trim any with the same value. */ 2837 for (i = 1, j = 1; i < symcount; ++i) 2838 if (syms[i - 1]->value + syms[i - 1]->section->vma 2839 != syms[i]->value + syms[i]->section->vma) 2840 syms[j++] = syms[i]; 2841 symcount = j; 2842 } 2843 2844 i = 0; 2845 if (syms[i]->section == opd) 2846 ++i; 2847 codesecsym = i; 2848 2849 for (; i < symcount; ++i) 2850 if (((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2851 != (SEC_CODE | SEC_ALLOC)) 2852 || (syms[i]->flags & BSF_SECTION_SYM) == 0) 2853 break; 2854 codesecsymend = i; 2855 2856 for (; i < symcount; ++i) 2857 if ((syms[i]->flags & BSF_SECTION_SYM) == 0) 2858 break; 2859 secsymend = i; 2860 2861 for (; i < symcount; ++i) 2862 if (syms[i]->section != opd) 2863 break; 2864 opdsymend = i; 2865 2866 for (; i < symcount; ++i) 2867 if ((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2868 != (SEC_CODE | SEC_ALLOC)) 2869 break; 2870 symcount = i; 2871 2872 count = 0; 2873 if (opdsymend == secsymend) 2874 goto done; 2875 2876 if (relocatable) 2877 { 2878 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean); 2879 arelent *r; 2880 size_t size; 2881 long relcount; 2882 2883 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table; 2884 relcount = (opd->flags & SEC_RELOC) ? opd->reloc_count : 0; 2885 if (relcount == 0) 2886 goto done; 2887 2888 if (!(*slurp_relocs) (abfd, opd, static_syms, FALSE)) 2889 { 2890 count = -1; 2891 goto done; 2892 } 2893 2894 size = 0; 2895 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i) 2896 { 2897 asymbol *sym; 2898 2899 while (r < opd->relocation + relcount 2900 && r->address < syms[i]->value + opd->vma) 2901 ++r; 2902 2903 if (r == opd->relocation + relcount) 2904 break; 2905 2906 if (r->address != syms[i]->value + opd->vma) 2907 continue; 2908 2909 if (r->howto->type != R_PPC64_ADDR64) 2910 continue; 2911 2912 sym = *r->sym_ptr_ptr; 2913 if (!sym_exists_at (syms, opdsymend, symcount, 2914 sym->section->id, sym->value + r->addend)) 2915 { 2916 ++count; 2917 size += sizeof (asymbol); 2918 size += strlen (syms[i]->name) + 2; 2919 } 2920 } 2921 2922 s = *ret = bfd_malloc (size); 2923 if (s == NULL) 2924 { 2925 count = -1; 2926 goto done; 2927 } 2928 2929 names = (char *) (s + count); 2930 2931 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i) 2932 { 2933 asymbol *sym; 2934 2935 while (r < opd->relocation + relcount 2936 && r->address < syms[i]->value + opd->vma) 2937 ++r; 2938 2939 if (r == opd->relocation + relcount) 2940 break; 2941 2942 if (r->address != syms[i]->value + opd->vma) 2943 continue; 2944 2945 if (r->howto->type != R_PPC64_ADDR64) 2946 continue; 2947 2948 sym = *r->sym_ptr_ptr; 2949 if (!sym_exists_at (syms, opdsymend, symcount, 2950 sym->section->id, sym->value + r->addend)) 2951 { 2952 size_t len; 2953 2954 *s = *syms[i]; 2955 s->section = sym->section; 2956 s->value = sym->value + r->addend; 2957 s->name = names; 2958 *names++ = '.'; 2959 len = strlen (syms[i]->name); 2960 memcpy (names, syms[i]->name, len + 1); 2961 names += len + 1; 2962 s++; 2963 } 2964 } 2965 } 2966 else 2967 { 2968 bfd_byte *contents; 2969 size_t size; 2970 2971 if (!bfd_malloc_and_get_section (abfd, opd, &contents)) 2972 { 2973 if (contents) 2974 { 2975 free_contents_and_exit: 2976 free (contents); 2977 } 2978 count = -1; 2979 goto done; 2980 } 2981 2982 size = 0; 2983 for (i = secsymend; i < opdsymend; ++i) 2984 { 2985 bfd_vma ent; 2986 2987 ent = bfd_get_64 (abfd, contents + syms[i]->value); 2988 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent)) 2989 { 2990 ++count; 2991 size += sizeof (asymbol); 2992 size += strlen (syms[i]->name) + 2; 2993 } 2994 } 2995 2996 s = *ret = bfd_malloc (size); 2997 if (s == NULL) 2998 goto free_contents_and_exit; 2999 3000 names = (char *) (s + count); 3001 3002 for (i = secsymend; i < opdsymend; ++i) 3003 { 3004 bfd_vma ent; 3005 3006 ent = bfd_get_64 (abfd, contents + syms[i]->value); 3007 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent)) 3008 { 3009 long lo, hi; 3010 size_t len; 3011 asection *sec = abfd->sections; 3012 3013 *s = *syms[i]; 3014 lo = codesecsym; 3015 hi = codesecsymend; 3016 while (lo < hi) 3017 { 3018 long mid = (lo + hi) >> 1; 3019 if (syms[mid]->section->vma < ent) 3020 lo = mid + 1; 3021 else if (syms[mid]->section->vma > ent) 3022 hi = mid; 3023 else 3024 { 3025 sec = syms[mid]->section; 3026 break; 3027 } 3028 } 3029 3030 if (lo >= hi && lo > codesecsym) 3031 sec = syms[lo - 1]->section; 3032 3033 for (; sec != NULL; sec = sec->next) 3034 { 3035 if (sec->vma > ent) 3036 break; 3037 if ((sec->flags & SEC_ALLOC) == 0 3038 || (sec->flags & SEC_LOAD) == 0) 3039 break; 3040 if ((sec->flags & SEC_CODE) != 0) 3041 s->section = sec; 3042 } 3043 s->value = ent - s->section->vma; 3044 s->name = names; 3045 *names++ = '.'; 3046 len = strlen (syms[i]->name); 3047 memcpy (names, syms[i]->name, len + 1); 3048 names += len + 1; 3049 s++; 3050 } 3051 } 3052 free (contents); 3053 } 3054 3055 done: 3056 free (syms); 3057 return count; 3058} 3059 3060/* The following functions are specific to the ELF linker, while 3061 functions above are used generally. Those named ppc64_elf_* are 3062 called by the main ELF linker code. They appear in this file more 3063 or less in the order in which they are called. eg. 3064 ppc64_elf_check_relocs is called early in the link process, 3065 ppc64_elf_finish_dynamic_sections is one of the last functions 3066 called. 3067 3068 PowerPC64-ELF uses a similar scheme to PowerPC64-XCOFF in that 3069 functions have both a function code symbol and a function descriptor 3070 symbol. A call to foo in a relocatable object file looks like: 3071 3072 . .text 3073 . x: 3074 . bl .foo 3075 . nop 3076 3077 The function definition in another object file might be: 3078 3079 . .section .opd 3080 . foo: .quad .foo 3081 . .quad .TOC.@tocbase 3082 . .quad 0 3083 . 3084 . .text 3085 . .foo: blr 3086 3087 When the linker resolves the call during a static link, the branch 3088 unsurprisingly just goes to .foo and the .opd information is unused. 3089 If the function definition is in a shared library, things are a little 3090 different: The call goes via a plt call stub, the opd information gets 3091 copied to the plt, and the linker patches the nop. 3092 3093 . x: 3094 . bl .foo_stub 3095 . ld 2,40(1) 3096 . 3097 . 3098 . .foo_stub: 3099 . addis 12,2,Lfoo@toc@ha # in practice, the call stub 3100 . addi 12,12,Lfoo@toc@l # is slightly optimized, but 3101 . std 2,40(1) # this is the general idea 3102 . ld 11,0(12) 3103 . ld 2,8(12) 3104 . mtctr 11 3105 . ld 11,16(12) 3106 . bctr 3107 . 3108 . .section .plt 3109 . Lfoo: reloc (R_PPC64_JMP_SLOT, foo) 3110 3111 The "reloc ()" notation is supposed to indicate that the linker emits 3112 an R_PPC64_JMP_SLOT reloc against foo. The dynamic linker does the opd 3113 copying. 3114 3115 What are the difficulties here? Well, firstly, the relocations 3116 examined by the linker in check_relocs are against the function code 3117 sym .foo, while the dynamic relocation in the plt is emitted against 3118 the function descriptor symbol, foo. Somewhere along the line, we need 3119 to carefully copy dynamic link information from one symbol to the other. 3120 Secondly, the generic part of the elf linker will make .foo a dynamic 3121 symbol as is normal for most other backends. We need foo dynamic 3122 instead, at least for an application final link. However, when 3123 creating a shared library containing foo, we need to have both symbols 3124 dynamic so that references to .foo are satisfied during the early 3125 stages of linking. Otherwise the linker might decide to pull in a 3126 definition from some other object, eg. a static library. 3127 3128 Update: As of August 2004, we support a new convention. Function 3129 calls may use the function descriptor symbol, ie. "bl foo". This 3130 behaves exactly as "bl .foo". */ 3131 3132/* The linker needs to keep track of the number of relocs that it 3133 decides to copy as dynamic relocs in check_relocs for each symbol. 3134 This is so that it can later discard them if they are found to be 3135 unnecessary. We store the information in a field extending the 3136 regular ELF linker hash table. */ 3137 3138struct ppc_dyn_relocs 3139{ 3140 struct ppc_dyn_relocs *next; 3141 3142 /* The input section of the reloc. */ 3143 asection *sec; 3144 3145 /* Total number of relocs copied for the input section. */ 3146 bfd_size_type count; 3147 3148 /* Number of pc-relative relocs copied for the input section. */ 3149 bfd_size_type pc_count; 3150}; 3151 3152/* Track GOT entries needed for a given symbol. We might need more 3153 than one got entry per symbol. */ 3154struct got_entry 3155{ 3156 struct got_entry *next; 3157 3158 /* The symbol addend that we'll be placing in the GOT. */ 3159 bfd_vma addend; 3160 3161 /* Unlike other ELF targets, we use separate GOT entries for the same 3162 symbol referenced from different input files. This is to support 3163 automatic multiple TOC/GOT sections, where the TOC base can vary 3164 from one input file to another. 3165 3166 Point to the BFD owning this GOT entry. */ 3167 bfd *owner; 3168 3169 /* Zero for non-tls entries, or TLS_TLS and one of TLS_GD, TLS_LD, 3170 TLS_TPREL or TLS_DTPREL for tls entries. */ 3171 char tls_type; 3172 3173 /* Reference count until size_dynamic_sections, GOT offset thereafter. */ 3174 union 3175 { 3176 bfd_signed_vma refcount; 3177 bfd_vma offset; 3178 } got; 3179}; 3180 3181/* The same for PLT. */ 3182struct plt_entry 3183{ 3184 struct plt_entry *next; 3185 3186 bfd_vma addend; 3187 3188 union 3189 { 3190 bfd_signed_vma refcount; 3191 bfd_vma offset; 3192 } plt; 3193}; 3194 3195/* Of those relocs that might be copied as dynamic relocs, this macro 3196 selects those that must be copied when linking a shared library, 3197 even when the symbol is local. */ 3198 3199#define MUST_BE_DYN_RELOC(RTYPE) \ 3200 ((RTYPE) != R_PPC64_REL32 \ 3201 && (RTYPE) != R_PPC64_REL64 \ 3202 && (RTYPE) != R_PPC64_REL30) 3203 3204/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 3205 copying dynamic variables from a shared lib into an app's dynbss 3206 section, and instead use a dynamic relocation to point into the 3207 shared lib. With code that gcc generates, it's vital that this be 3208 enabled; In the PowerPC64 ABI, the address of a function is actually 3209 the address of a function descriptor, which resides in the .opd 3210 section. gcc uses the descriptor directly rather than going via the 3211 GOT as some other ABI's do, which means that initialized function 3212 pointers must reference the descriptor. Thus, a function pointer 3213 initialized to the address of a function in a shared library will 3214 either require a copy reloc, or a dynamic reloc. Using a copy reloc 3215 redefines the function descriptor symbol to point to the copy. This 3216 presents a problem as a plt entry for that function is also 3217 initialized from the function descriptor symbol and the copy reloc 3218 may not be initialized first. */ 3219#define ELIMINATE_COPY_RELOCS 1 3220 3221/* Section name for stubs is the associated section name plus this 3222 string. */ 3223#define STUB_SUFFIX ".stub" 3224 3225/* Linker stubs. 3226 ppc_stub_long_branch: 3227 Used when a 14 bit branch (or even a 24 bit branch) can't reach its 3228 destination, but a 24 bit branch in a stub section will reach. 3229 . b dest 3230 3231 ppc_stub_plt_branch: 3232 Similar to the above, but a 24 bit branch in the stub section won't 3233 reach its destination. 3234 . addis %r12,%r2,xxx@toc@ha 3235 . ld %r11,xxx@toc@l(%r12) 3236 . mtctr %r11 3237 . bctr 3238 3239 ppc_stub_plt_call: 3240 Used to call a function in a shared library. If it so happens that 3241 the plt entry referenced crosses a 64k boundary, then an extra 3242 "addi %r12,%r12,xxx@toc@l" will be inserted before the "mtctr". 3243 . addis %r12,%r2,xxx@toc@ha 3244 . std %r2,40(%r1) 3245 . ld %r11,xxx+0@toc@l(%r12) 3246 . mtctr %r11 3247 . ld %r2,xxx+8@toc@l(%r12) 3248 . ld %r11,xxx+16@toc@l(%r12) 3249 . bctr 3250 3251 ppc_stub_long_branch and ppc_stub_plt_branch may also have additional 3252 code to adjust the value and save r2 to support multiple toc sections. 3253 A ppc_stub_long_branch with an r2 offset looks like: 3254 . std %r2,40(%r1) 3255 . addis %r2,%r2,off@ha 3256 . addi %r2,%r2,off@l 3257 . b dest 3258 3259 A ppc_stub_plt_branch with an r2 offset looks like: 3260 . std %r2,40(%r1) 3261 . addis %r12,%r2,xxx@toc@ha 3262 . ld %r11,xxx@toc@l(%r12) 3263 . addis %r2,%r2,off@ha 3264 . addi %r2,%r2,off@l 3265 . mtctr %r11 3266 . bctr 3267 3268 In cases where the "addis" instruction would add zero, the "addis" is 3269 omitted and following instructions modified slightly in some cases. 3270*/ 3271 3272enum ppc_stub_type { 3273 ppc_stub_none, 3274 ppc_stub_long_branch, 3275 ppc_stub_long_branch_r2off, 3276 ppc_stub_plt_branch, 3277 ppc_stub_plt_branch_r2off, 3278 ppc_stub_plt_call 3279}; 3280 3281struct ppc_stub_hash_entry { 3282 3283 /* Base hash table entry structure. */ 3284 struct bfd_hash_entry root; 3285 3286 enum ppc_stub_type stub_type; 3287 3288 /* The stub section. */ 3289 asection *stub_sec; 3290 3291 /* Offset within stub_sec of the beginning of this stub. */ 3292 bfd_vma stub_offset; 3293 3294 /* Given the symbol's value and its section we can determine its final 3295 value when building the stubs (so the stub knows where to jump. */ 3296 bfd_vma target_value; 3297 asection *target_section; 3298 3299 /* The symbol table entry, if any, that this was derived from. */ 3300 struct ppc_link_hash_entry *h; 3301 3302 /* And the reloc addend that this was derived from. */ 3303 bfd_vma addend; 3304 3305 /* Where this stub is being called from, or, in the case of combined 3306 stub sections, the first input section in the group. */ 3307 asection *id_sec; 3308}; 3309 3310struct ppc_branch_hash_entry { 3311 3312 /* Base hash table entry structure. */ 3313 struct bfd_hash_entry root; 3314 3315 /* Offset within branch lookup table. */ 3316 unsigned int offset; 3317 3318 /* Generation marker. */ 3319 unsigned int iter; 3320}; 3321 3322struct ppc_link_hash_entry 3323{ 3324 struct elf_link_hash_entry elf; 3325 3326 union { 3327 /* A pointer to the most recently used stub hash entry against this 3328 symbol. */ 3329 struct ppc_stub_hash_entry *stub_cache; 3330 3331 /* A pointer to the next symbol starting with a '.' */ 3332 struct ppc_link_hash_entry *next_dot_sym; 3333 } u; 3334 3335 /* Track dynamic relocs copied for this symbol. */ 3336 struct ppc_dyn_relocs *dyn_relocs; 3337 3338 /* Link between function code and descriptor symbols. */ 3339 struct ppc_link_hash_entry *oh; 3340 3341 /* Flag function code and descriptor symbols. */ 3342 unsigned int is_func:1; 3343 unsigned int is_func_descriptor:1; 3344 unsigned int fake:1; 3345 3346 /* Whether global opd/toc sym has been adjusted or not. 3347 After ppc64_elf_edit_opd/ppc64_elf_edit_toc has run, this flag 3348 should be set for all globals defined in any opd/toc section. */ 3349 unsigned int adjust_done:1; 3350 3351 /* Set if we twiddled this symbol to weak at some stage. */ 3352 unsigned int was_undefined:1; 3353 3354 /* Contexts in which symbol is used in the GOT (or TOC). 3355 TLS_GD .. TLS_EXPLICIT bits are or'd into the mask as the 3356 corresponding relocs are encountered during check_relocs. 3357 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to 3358 indicate the corresponding GOT entry type is not needed. 3359 tls_optimize may also set TLS_TPRELGD when a GD reloc turns into 3360 a TPREL one. We use a separate flag rather than setting TPREL 3361 just for convenience in distinguishing the two cases. */ 3362#define TLS_GD 1 /* GD reloc. */ 3363#define TLS_LD 2 /* LD reloc. */ 3364#define TLS_TPREL 4 /* TPREL reloc, => IE. */ 3365#define TLS_DTPREL 8 /* DTPREL reloc, => LD. */ 3366#define TLS_TLS 16 /* Any TLS reloc. */ 3367#define TLS_EXPLICIT 32 /* Marks TOC section TLS relocs. */ 3368#define TLS_TPRELGD 64 /* TPREL reloc resulting from GD->IE. */ 3369 char tls_mask; 3370}; 3371 3372/* ppc64 ELF linker hash table. */ 3373 3374struct ppc_link_hash_table 3375{ 3376 struct elf_link_hash_table elf; 3377 3378 /* The stub hash table. */ 3379 struct bfd_hash_table stub_hash_table; 3380 3381 /* Another hash table for plt_branch stubs. */ 3382 struct bfd_hash_table branch_hash_table; 3383 3384 /* Linker stub bfd. */ 3385 bfd *stub_bfd; 3386 3387 /* Linker call-backs. */ 3388 asection * (*add_stub_section) (const char *, asection *); 3389 void (*layout_sections_again) (void); 3390 3391 /* Array to keep track of which stub sections have been created, and 3392 information on stub grouping. */ 3393 struct map_stub { 3394 /* This is the section to which stubs in the group will be attached. */ 3395 asection *link_sec; 3396 /* The stub section. */ 3397 asection *stub_sec; 3398 /* Along with elf_gp, specifies the TOC pointer used in this group. */ 3399 bfd_vma toc_off; 3400 } *stub_group; 3401 3402 /* Temp used when calculating TOC pointers. */ 3403 bfd_vma toc_curr; 3404 3405 /* Highest input section id. */ 3406 int top_id; 3407 3408 /* Highest output section index. */ 3409 int top_index; 3410 3411 /* Used when adding symbols. */ 3412 struct ppc_link_hash_entry *dot_syms; 3413 3414 /* List of input sections for each output section. */ 3415 asection **input_list; 3416 3417 /* Short-cuts to get to dynamic linker sections. */ 3418 asection *got; 3419 asection *plt; 3420 asection *relplt; 3421 asection *dynbss; 3422 asection *relbss; 3423 asection *glink; 3424 asection *sfpr; 3425 asection *brlt; 3426 asection *relbrlt; 3427 3428 /* Shortcut to .__tls_get_addr and __tls_get_addr. */ 3429 struct ppc_link_hash_entry *tls_get_addr; 3430 struct ppc_link_hash_entry *tls_get_addr_fd; 3431 3432 /* Statistics. */ 3433 unsigned long stub_count[ppc_stub_plt_call]; 3434 3435 /* Number of stubs against global syms. */ 3436 unsigned long stub_globals; 3437 3438 /* Set if we should emit symbols for stubs. */ 3439 unsigned int emit_stub_syms:1; 3440 3441 /* Support for multiple toc sections. */ 3442 unsigned int no_multi_toc:1; 3443 unsigned int multi_toc_needed:1; 3444 3445 /* Set on error. */ 3446 unsigned int stub_error:1; 3447 3448 /* Temp used by ppc64_elf_check_directives. */ 3449 unsigned int twiddled_syms:1; 3450 3451 /* Incremented every time we size stubs. */ 3452 unsigned int stub_iteration; 3453 3454 /* Small local sym to section mapping cache. */ 3455 struct sym_sec_cache sym_sec; 3456}; 3457 3458/* Rename some of the generic section flags to better document how they 3459 are used here. */ 3460#define has_toc_reloc has_gp_reloc 3461#define makes_toc_func_call need_finalize_relax 3462#define call_check_in_progress reloc_done 3463 3464/* Get the ppc64 ELF linker hash table from a link_info structure. */ 3465 3466#define ppc_hash_table(p) \ 3467 ((struct ppc_link_hash_table *) ((p)->hash)) 3468 3469#define ppc_stub_hash_lookup(table, string, create, copy) \ 3470 ((struct ppc_stub_hash_entry *) \ 3471 bfd_hash_lookup ((table), (string), (create), (copy))) 3472 3473#define ppc_branch_hash_lookup(table, string, create, copy) \ 3474 ((struct ppc_branch_hash_entry *) \ 3475 bfd_hash_lookup ((table), (string), (create), (copy))) 3476 3477/* Create an entry in the stub hash table. */ 3478 3479static struct bfd_hash_entry * 3480stub_hash_newfunc (struct bfd_hash_entry *entry, 3481 struct bfd_hash_table *table, 3482 const char *string) 3483{ 3484 /* Allocate the structure if it has not already been allocated by a 3485 subclass. */ 3486 if (entry == NULL) 3487 { 3488 entry = bfd_hash_allocate (table, sizeof (struct ppc_stub_hash_entry)); 3489 if (entry == NULL) 3490 return entry; 3491 } 3492 3493 /* Call the allocation method of the superclass. */ 3494 entry = bfd_hash_newfunc (entry, table, string); 3495 if (entry != NULL) 3496 { 3497 struct ppc_stub_hash_entry *eh; 3498 3499 /* Initialize the local fields. */ 3500 eh = (struct ppc_stub_hash_entry *) entry; 3501 eh->stub_type = ppc_stub_none; 3502 eh->stub_sec = NULL; 3503 eh->stub_offset = 0; 3504 eh->target_value = 0; 3505 eh->target_section = NULL; 3506 eh->h = NULL; 3507 eh->id_sec = NULL; 3508 } 3509 3510 return entry; 3511} 3512 3513/* Create an entry in the branch hash table. */ 3514 3515static struct bfd_hash_entry * 3516branch_hash_newfunc (struct bfd_hash_entry *entry, 3517 struct bfd_hash_table *table, 3518 const char *string) 3519{ 3520 /* Allocate the structure if it has not already been allocated by a 3521 subclass. */ 3522 if (entry == NULL) 3523 { 3524 entry = bfd_hash_allocate (table, sizeof (struct ppc_branch_hash_entry)); 3525 if (entry == NULL) 3526 return entry; 3527 } 3528 3529 /* Call the allocation method of the superclass. */ 3530 entry = bfd_hash_newfunc (entry, table, string); 3531 if (entry != NULL) 3532 { 3533 struct ppc_branch_hash_entry *eh; 3534 3535 /* Initialize the local fields. */ 3536 eh = (struct ppc_branch_hash_entry *) entry; 3537 eh->offset = 0; 3538 eh->iter = 0; 3539 } 3540 3541 return entry; 3542} 3543 3544/* Create an entry in a ppc64 ELF linker hash table. */ 3545 3546static struct bfd_hash_entry * 3547link_hash_newfunc (struct bfd_hash_entry *entry, 3548 struct bfd_hash_table *table, 3549 const char *string) 3550{ 3551 /* Allocate the structure if it has not already been allocated by a 3552 subclass. */ 3553 if (entry == NULL) 3554 { 3555 entry = bfd_hash_allocate (table, sizeof (struct ppc_link_hash_entry)); 3556 if (entry == NULL) 3557 return entry; 3558 } 3559 3560 /* Call the allocation method of the superclass. */ 3561 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 3562 if (entry != NULL) 3563 { 3564 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) entry; 3565 3566 memset (&eh->u.stub_cache, 0, 3567 (sizeof (struct ppc_link_hash_entry) 3568 - offsetof (struct ppc_link_hash_entry, u.stub_cache))); 3569 3570 /* When making function calls, old ABI code references function entry 3571 points (dot symbols), while new ABI code references the function 3572 descriptor symbol. We need to make any combination of reference and 3573 definition work together, without breaking archive linking. 3574 3575 For a defined function "foo" and an undefined call to "bar": 3576 An old object defines "foo" and ".foo", references ".bar" (possibly 3577 "bar" too). 3578 A new object defines "foo" and references "bar". 3579 3580 A new object thus has no problem with its undefined symbols being 3581 satisfied by definitions in an old object. On the other hand, the 3582 old object won't have ".bar" satisfied by a new object. 3583 3584 Keep a list of newly added dot-symbols. */ 3585 3586 if (string[0] == '.') 3587 { 3588 struct ppc_link_hash_table *htab; 3589 3590 htab = (struct ppc_link_hash_table *) table; 3591 eh->u.next_dot_sym = htab->dot_syms; 3592 htab->dot_syms = eh; 3593 } 3594 } 3595 3596 return entry; 3597} 3598 3599/* Create a ppc64 ELF linker hash table. */ 3600 3601static struct bfd_link_hash_table * 3602ppc64_elf_link_hash_table_create (bfd *abfd) 3603{ 3604 struct ppc_link_hash_table *htab; 3605 bfd_size_type amt = sizeof (struct ppc_link_hash_table); 3606 3607 htab = bfd_zmalloc (amt); 3608 if (htab == NULL) 3609 return NULL; 3610 3611 if (!_bfd_elf_link_hash_table_init (&htab->elf, abfd, link_hash_newfunc, 3612 sizeof (struct ppc_link_hash_entry))) 3613 { 3614 free (htab); 3615 return NULL; 3616 } 3617 3618 /* Init the stub hash table too. */ 3619 if (!bfd_hash_table_init (&htab->stub_hash_table, stub_hash_newfunc, 3620 sizeof (struct ppc_stub_hash_entry))) 3621 return NULL; 3622 3623 /* And the branch hash table. */ 3624 if (!bfd_hash_table_init (&htab->branch_hash_table, branch_hash_newfunc, 3625 sizeof (struct ppc_branch_hash_entry))) 3626 return NULL; 3627 3628 /* Initializing two fields of the union is just cosmetic. We really 3629 only care about glist, but when compiled on a 32-bit host the 3630 bfd_vma fields are larger. Setting the bfd_vma to zero makes 3631 debugger inspection of these fields look nicer. */ 3632 htab->elf.init_got_refcount.refcount = 0; 3633 htab->elf.init_got_refcount.glist = NULL; 3634 htab->elf.init_plt_refcount.refcount = 0; 3635 htab->elf.init_plt_refcount.glist = NULL; 3636 htab->elf.init_got_offset.offset = 0; 3637 htab->elf.init_got_offset.glist = NULL; 3638 htab->elf.init_plt_offset.offset = 0; 3639 htab->elf.init_plt_offset.glist = NULL; 3640 3641 return &htab->elf.root; 3642} 3643 3644/* Free the derived linker hash table. */ 3645 3646static void 3647ppc64_elf_link_hash_table_free (struct bfd_link_hash_table *hash) 3648{ 3649 struct ppc_link_hash_table *ret = (struct ppc_link_hash_table *) hash; 3650 3651 bfd_hash_table_free (&ret->stub_hash_table); 3652 bfd_hash_table_free (&ret->branch_hash_table); 3653 _bfd_generic_link_hash_table_free (hash); 3654} 3655 3656/* Satisfy the ELF linker by filling in some fields in our fake bfd. */ 3657 3658void 3659ppc64_elf_init_stub_bfd (bfd *abfd, struct bfd_link_info *info) 3660{ 3661 struct ppc_link_hash_table *htab; 3662 3663 elf_elfheader (abfd)->e_ident[EI_CLASS] = ELFCLASS64; 3664 3665/* Always hook our dynamic sections into the first bfd, which is the 3666 linker created stub bfd. This ensures that the GOT header is at 3667 the start of the output TOC section. */ 3668 htab = ppc_hash_table (info); 3669 htab->stub_bfd = abfd; 3670 htab->elf.dynobj = abfd; 3671} 3672 3673/* Build a name for an entry in the stub hash table. */ 3674 3675static char * 3676ppc_stub_name (const asection *input_section, 3677 const asection *sym_sec, 3678 const struct ppc_link_hash_entry *h, 3679 const Elf_Internal_Rela *rel) 3680{ 3681 char *stub_name; 3682 bfd_size_type len; 3683 3684 /* rel->r_addend is actually 64 bit, but who uses more than +/- 2^31 3685 offsets from a sym as a branch target? In fact, we could 3686 probably assume the addend is always zero. */ 3687 BFD_ASSERT (((int) rel->r_addend & 0xffffffff) == rel->r_addend); 3688 3689 if (h) 3690 { 3691 len = 8 + 1 + strlen (h->elf.root.root.string) + 1 + 8 + 1; 3692 stub_name = bfd_malloc (len); 3693 if (stub_name == NULL) 3694 return stub_name; 3695 3696 sprintf (stub_name, "%08x.%s+%x", 3697 input_section->id & 0xffffffff, 3698 h->elf.root.root.string, 3699 (int) rel->r_addend & 0xffffffff); 3700 } 3701 else 3702 { 3703 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1; 3704 stub_name = bfd_malloc (len); 3705 if (stub_name == NULL) 3706 return stub_name; 3707 3708 sprintf (stub_name, "%08x.%x:%x+%x", 3709 input_section->id & 0xffffffff, 3710 sym_sec->id & 0xffffffff, 3711 (int) ELF64_R_SYM (rel->r_info) & 0xffffffff, 3712 (int) rel->r_addend & 0xffffffff); 3713 } 3714 if (stub_name[len - 2] == '+' && stub_name[len - 1] == '0') 3715 stub_name[len - 2] = 0; 3716 return stub_name; 3717} 3718 3719/* Look up an entry in the stub hash. Stub entries are cached because 3720 creating the stub name takes a bit of time. */ 3721 3722static struct ppc_stub_hash_entry * 3723ppc_get_stub_entry (const asection *input_section, 3724 const asection *sym_sec, 3725 struct ppc_link_hash_entry *h, 3726 const Elf_Internal_Rela *rel, 3727 struct ppc_link_hash_table *htab) 3728{ 3729 struct ppc_stub_hash_entry *stub_entry; 3730 const asection *id_sec; 3731 3732 /* If this input section is part of a group of sections sharing one 3733 stub section, then use the id of the first section in the group. 3734 Stub names need to include a section id, as there may well be 3735 more than one stub used to reach say, printf, and we need to 3736 distinguish between them. */ 3737 id_sec = htab->stub_group[input_section->id].link_sec; 3738 3739 if (h != NULL && h->u.stub_cache != NULL 3740 && h->u.stub_cache->h == h 3741 && h->u.stub_cache->id_sec == id_sec) 3742 { 3743 stub_entry = h->u.stub_cache; 3744 } 3745 else 3746 { 3747 char *stub_name; 3748 3749 stub_name = ppc_stub_name (id_sec, sym_sec, h, rel); 3750 if (stub_name == NULL) 3751 return NULL; 3752 3753 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, 3754 stub_name, FALSE, FALSE); 3755 if (h != NULL) 3756 h->u.stub_cache = stub_entry; 3757 3758 free (stub_name); 3759 } 3760 3761 return stub_entry; 3762} 3763 3764/* Add a new stub entry to the stub hash. Not all fields of the new 3765 stub entry are initialised. */ 3766 3767static struct ppc_stub_hash_entry * 3768ppc_add_stub (const char *stub_name, 3769 asection *section, 3770 struct ppc_link_hash_table *htab) 3771{ 3772 asection *link_sec; 3773 asection *stub_sec; 3774 struct ppc_stub_hash_entry *stub_entry; 3775 3776 link_sec = htab->stub_group[section->id].link_sec; 3777 stub_sec = htab->stub_group[section->id].stub_sec; 3778 if (stub_sec == NULL) 3779 { 3780 stub_sec = htab->stub_group[link_sec->id].stub_sec; 3781 if (stub_sec == NULL) 3782 { 3783 size_t namelen; 3784 bfd_size_type len; 3785 char *s_name; 3786 3787 namelen = strlen (link_sec->name); 3788 len = namelen + sizeof (STUB_SUFFIX); 3789 s_name = bfd_alloc (htab->stub_bfd, len); 3790 if (s_name == NULL) 3791 return NULL; 3792 3793 memcpy (s_name, link_sec->name, namelen); 3794 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX)); 3795 stub_sec = (*htab->add_stub_section) (s_name, link_sec); 3796 if (stub_sec == NULL) 3797 return NULL; 3798 htab->stub_group[link_sec->id].stub_sec = stub_sec; 3799 } 3800 htab->stub_group[section->id].stub_sec = stub_sec; 3801 } 3802 3803 /* Enter this entry into the linker stub hash table. */ 3804 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, stub_name, 3805 TRUE, FALSE); 3806 if (stub_entry == NULL) 3807 { 3808 (*_bfd_error_handler) (_("%B: cannot create stub entry %s"), 3809 section->owner, stub_name); 3810 return NULL; 3811 } 3812 3813 stub_entry->stub_sec = stub_sec; 3814 stub_entry->stub_offset = 0; 3815 stub_entry->id_sec = link_sec; 3816 return stub_entry; 3817} 3818 3819/* Create sections for linker generated code. */ 3820 3821static bfd_boolean 3822create_linkage_sections (bfd *dynobj, struct bfd_link_info *info) 3823{ 3824 struct ppc_link_hash_table *htab; 3825 flagword flags; 3826 3827 htab = ppc_hash_table (info); 3828 3829 /* Create .sfpr for code to save and restore fp regs. */ 3830 flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_READONLY 3831 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3832 htab->sfpr = bfd_make_section_anyway_with_flags (dynobj, ".sfpr", 3833 flags); 3834 if (htab->sfpr == NULL 3835 || ! bfd_set_section_alignment (dynobj, htab->sfpr, 2)) 3836 return FALSE; 3837 3838 /* Create .glink for lazy dynamic linking support. */ 3839 htab->glink = bfd_make_section_anyway_with_flags (dynobj, ".glink", 3840 flags); 3841 if (htab->glink == NULL 3842 || ! bfd_set_section_alignment (dynobj, htab->glink, 3)) 3843 return FALSE; 3844 3845 /* Create branch lookup table for plt_branch stubs. */ 3846 flags = (SEC_ALLOC | SEC_LOAD 3847 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3848 htab->brlt = bfd_make_section_anyway_with_flags (dynobj, ".branch_lt", 3849 flags); 3850 if (htab->brlt == NULL 3851 || ! bfd_set_section_alignment (dynobj, htab->brlt, 3)) 3852 return FALSE; 3853 3854 if (!info->shared) 3855 return TRUE; 3856 3857 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY 3858 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3859 htab->relbrlt = bfd_make_section_anyway_with_flags (dynobj, 3860 ".rela.branch_lt", 3861 flags); 3862 if (!htab->relbrlt 3863 || ! bfd_set_section_alignment (dynobj, htab->relbrlt, 3)) 3864 return FALSE; 3865 3866 return TRUE; 3867} 3868 3869/* Create .got and .rela.got sections in ABFD, and .got in dynobj if 3870 not already done. */ 3871 3872static bfd_boolean 3873create_got_section (bfd *abfd, struct bfd_link_info *info) 3874{ 3875 asection *got, *relgot; 3876 flagword flags; 3877 struct ppc_link_hash_table *htab = ppc_hash_table (info); 3878 3879 if (!htab->got) 3880 { 3881 if (! _bfd_elf_create_got_section (htab->elf.dynobj, info)) 3882 return FALSE; 3883 3884 htab->got = bfd_get_section_by_name (htab->elf.dynobj, ".got"); 3885 if (!htab->got) 3886 abort (); 3887 } 3888 3889 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 3890 | SEC_LINKER_CREATED); 3891 3892 got = bfd_make_section_anyway_with_flags (abfd, ".got", flags); 3893 if (!got 3894 || !bfd_set_section_alignment (abfd, got, 3)) 3895 return FALSE; 3896 3897 relgot = bfd_make_section_anyway_with_flags (abfd, ".rela.got", 3898 flags | SEC_READONLY); 3899 if (!relgot 3900 || ! bfd_set_section_alignment (abfd, relgot, 3)) 3901 return FALSE; 3902 3903 ppc64_elf_tdata (abfd)->got = got; 3904 ppc64_elf_tdata (abfd)->relgot = relgot; 3905 return TRUE; 3906} 3907 3908/* Create the dynamic sections, and set up shortcuts. */ 3909 3910static bfd_boolean 3911ppc64_elf_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 3912{ 3913 struct ppc_link_hash_table *htab; 3914 3915 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 3916 return FALSE; 3917 3918 htab = ppc_hash_table (info); 3919 if (!htab->got) 3920 htab->got = bfd_get_section_by_name (dynobj, ".got"); 3921 htab->plt = bfd_get_section_by_name (dynobj, ".plt"); 3922 htab->relplt = bfd_get_section_by_name (dynobj, ".rela.plt"); 3923 htab->dynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 3924 if (!info->shared) 3925 htab->relbss = bfd_get_section_by_name (dynobj, ".rela.bss"); 3926 3927 if (!htab->got || !htab->plt || !htab->relplt || !htab->dynbss 3928 || (!info->shared && !htab->relbss)) 3929 abort (); 3930 3931 return TRUE; 3932} 3933 3934/* Merge PLT info on FROM with that on TO. */ 3935 3936static void 3937move_plt_plist (struct ppc_link_hash_entry *from, 3938 struct ppc_link_hash_entry *to) 3939{ 3940 if (from->elf.plt.plist != NULL) 3941 { 3942 if (to->elf.plt.plist != NULL) 3943 { 3944 struct plt_entry **entp; 3945 struct plt_entry *ent; 3946 3947 for (entp = &from->elf.plt.plist; (ent = *entp) != NULL; ) 3948 { 3949 struct plt_entry *dent; 3950 3951 for (dent = to->elf.plt.plist; dent != NULL; dent = dent->next) 3952 if (dent->addend == ent->addend) 3953 { 3954 dent->plt.refcount += ent->plt.refcount; 3955 *entp = ent->next; 3956 break; 3957 } 3958 if (dent == NULL) 3959 entp = &ent->next; 3960 } 3961 *entp = to->elf.plt.plist; 3962 } 3963 3964 to->elf.plt.plist = from->elf.plt.plist; 3965 from->elf.plt.plist = NULL; 3966 } 3967} 3968 3969/* Copy the extra info we tack onto an elf_link_hash_entry. */ 3970 3971static void 3972ppc64_elf_copy_indirect_symbol (struct bfd_link_info *info, 3973 struct elf_link_hash_entry *dir, 3974 struct elf_link_hash_entry *ind) 3975{ 3976 struct ppc_link_hash_entry *edir, *eind; 3977 3978 edir = (struct ppc_link_hash_entry *) dir; 3979 eind = (struct ppc_link_hash_entry *) ind; 3980 3981 /* Copy over any dynamic relocs we may have on the indirect sym. */ 3982 if (eind->dyn_relocs != NULL) 3983 { 3984 if (edir->dyn_relocs != NULL) 3985 { 3986 struct ppc_dyn_relocs **pp; 3987 struct ppc_dyn_relocs *p; 3988 3989 /* Add reloc counts against the indirect sym to the direct sym 3990 list. Merge any entries against the same section. */ 3991 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 3992 { 3993 struct ppc_dyn_relocs *q; 3994 3995 for (q = edir->dyn_relocs; q != NULL; q = q->next) 3996 if (q->sec == p->sec) 3997 { 3998 q->pc_count += p->pc_count; 3999 q->count += p->count; 4000 *pp = p->next; 4001 break; 4002 } 4003 if (q == NULL) 4004 pp = &p->next; 4005 } 4006 *pp = edir->dyn_relocs; 4007 } 4008 4009 edir->dyn_relocs = eind->dyn_relocs; 4010 eind->dyn_relocs = NULL; 4011 } 4012 4013 edir->is_func |= eind->is_func; 4014 edir->is_func_descriptor |= eind->is_func_descriptor; 4015 edir->tls_mask |= eind->tls_mask; 4016 4017 /* If called to transfer flags for a weakdef during processing 4018 of elf_adjust_dynamic_symbol, don't copy NON_GOT_REF. 4019 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 4020 if (!(ELIMINATE_COPY_RELOCS 4021 && eind->elf.root.type != bfd_link_hash_indirect 4022 && edir->elf.dynamic_adjusted)) 4023 edir->elf.non_got_ref |= eind->elf.non_got_ref; 4024 4025 edir->elf.ref_dynamic |= eind->elf.ref_dynamic; 4026 edir->elf.ref_regular |= eind->elf.ref_regular; 4027 edir->elf.ref_regular_nonweak |= eind->elf.ref_regular_nonweak; 4028 edir->elf.needs_plt |= eind->elf.needs_plt; 4029 4030 /* If we were called to copy over info for a weak sym, that's all. */ 4031 if (eind->elf.root.type != bfd_link_hash_indirect) 4032 return; 4033 4034 /* Copy over got entries that we may have already seen to the 4035 symbol which just became indirect. */ 4036 if (eind->elf.got.glist != NULL) 4037 { 4038 if (edir->elf.got.glist != NULL) 4039 { 4040 struct got_entry **entp; 4041 struct got_entry *ent; 4042 4043 for (entp = &eind->elf.got.glist; (ent = *entp) != NULL; ) 4044 { 4045 struct got_entry *dent; 4046 4047 for (dent = edir->elf.got.glist; dent != NULL; dent = dent->next) 4048 if (dent->addend == ent->addend 4049 && dent->owner == ent->owner 4050 && dent->tls_type == ent->tls_type) 4051 { 4052 dent->got.refcount += ent->got.refcount; 4053 *entp = ent->next; 4054 break; 4055 } 4056 if (dent == NULL) 4057 entp = &ent->next; 4058 } 4059 *entp = edir->elf.got.glist; 4060 } 4061 4062 edir->elf.got.glist = eind->elf.got.glist; 4063 eind->elf.got.glist = NULL; 4064 } 4065 4066 /* And plt entries. */ 4067 move_plt_plist (eind, edir); 4068 4069 if (eind->elf.dynindx != -1) 4070 { 4071 if (edir->elf.dynindx != -1) 4072 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, 4073 edir->elf.dynstr_index); 4074 edir->elf.dynindx = eind->elf.dynindx; 4075 edir->elf.dynstr_index = eind->elf.dynstr_index; 4076 eind->elf.dynindx = -1; 4077 eind->elf.dynstr_index = 0; 4078 } 4079} 4080 4081/* Find the function descriptor hash entry from the given function code 4082 hash entry FH. Link the entries via their OH fields. */ 4083 4084static struct ppc_link_hash_entry * 4085get_fdh (struct ppc_link_hash_entry *fh, struct ppc_link_hash_table *htab) 4086{ 4087 struct ppc_link_hash_entry *fdh = fh->oh; 4088 4089 if (fdh == NULL) 4090 { 4091 const char *fd_name = fh->elf.root.root.string + 1; 4092 4093 fdh = (struct ppc_link_hash_entry *) 4094 elf_link_hash_lookup (&htab->elf, fd_name, FALSE, FALSE, FALSE); 4095 if (fdh != NULL) 4096 { 4097 fdh->is_func_descriptor = 1; 4098 fdh->oh = fh; 4099 fh->is_func = 1; 4100 fh->oh = fdh; 4101 } 4102 } 4103 4104 return fdh; 4105} 4106 4107/* Make a fake function descriptor sym for the code sym FH. */ 4108 4109static struct ppc_link_hash_entry * 4110make_fdh (struct bfd_link_info *info, 4111 struct ppc_link_hash_entry *fh) 4112{ 4113 bfd *abfd; 4114 asymbol *newsym; 4115 struct bfd_link_hash_entry *bh; 4116 struct ppc_link_hash_entry *fdh; 4117 4118 abfd = fh->elf.root.u.undef.abfd; 4119 newsym = bfd_make_empty_symbol (abfd); 4120 newsym->name = fh->elf.root.root.string + 1; 4121 newsym->section = bfd_und_section_ptr; 4122 newsym->value = 0; 4123 newsym->flags = BSF_WEAK; 4124 4125 bh = NULL; 4126 if (!_bfd_generic_link_add_one_symbol (info, abfd, newsym->name, 4127 newsym->flags, newsym->section, 4128 newsym->value, NULL, FALSE, FALSE, 4129 &bh)) 4130 return NULL; 4131 4132 fdh = (struct ppc_link_hash_entry *) bh; 4133 fdh->elf.non_elf = 0; 4134 fdh->fake = 1; 4135 fdh->is_func_descriptor = 1; 4136 fdh->oh = fh; 4137 fh->is_func = 1; 4138 fh->oh = fdh; 4139 return fdh; 4140} 4141 4142/* Fix function descriptor symbols defined in .opd sections to be 4143 function type. */ 4144 4145static bfd_boolean 4146ppc64_elf_add_symbol_hook (bfd *ibfd ATTRIBUTE_UNUSED, 4147 struct bfd_link_info *info ATTRIBUTE_UNUSED, 4148 Elf_Internal_Sym *isym, 4149 const char **name ATTRIBUTE_UNUSED, 4150 flagword *flags ATTRIBUTE_UNUSED, 4151 asection **sec, 4152 bfd_vma *value ATTRIBUTE_UNUSED) 4153{ 4154 if (*sec != NULL 4155 && strcmp (bfd_get_section_name (ibfd, *sec), ".opd") == 0) 4156 isym->st_info = ELF_ST_INFO (ELF_ST_BIND (isym->st_info), STT_FUNC); 4157 4158 return TRUE; 4159} 4160 4161/* This function makes an old ABI object reference to ".bar" cause the 4162 inclusion of a new ABI object archive that defines "bar". 4163 NAME is a symbol defined in an archive. Return a symbol in the hash 4164 table that might be satisfied by the archive symbols. */ 4165 4166static struct elf_link_hash_entry * 4167ppc64_elf_archive_symbol_lookup (bfd *abfd, 4168 struct bfd_link_info *info, 4169 const char *name) 4170{ 4171 struct elf_link_hash_entry *h; 4172 char *dot_name; 4173 size_t len; 4174 4175 h = _bfd_elf_archive_symbol_lookup (abfd, info, name); 4176 if (h != NULL 4177 /* Don't return this sym if it is a fake function descriptor 4178 created by add_symbol_adjust. */ 4179 && !(h->root.type == bfd_link_hash_undefweak 4180 && ((struct ppc_link_hash_entry *) h)->fake)) 4181 return h; 4182 4183 if (name[0] == '.') 4184 return h; 4185 4186 len = strlen (name); 4187 dot_name = bfd_alloc (abfd, len + 2); 4188 if (dot_name == NULL) 4189 return (struct elf_link_hash_entry *) 0 - 1; 4190 dot_name[0] = '.'; 4191 memcpy (dot_name + 1, name, len + 1); 4192 h = _bfd_elf_archive_symbol_lookup (abfd, info, dot_name); 4193 bfd_release (abfd, dot_name); 4194 return h; 4195} 4196 4197/* This function satisfies all old ABI object references to ".bar" if a 4198 new ABI object defines "bar". Well, at least, undefined dot symbols 4199 are made weak. This stops later archive searches from including an 4200 object if we already have a function descriptor definition. It also 4201 prevents the linker complaining about undefined symbols. 4202 We also check and correct mismatched symbol visibility here. The 4203 most restrictive visibility of the function descriptor and the 4204 function entry symbol is used. */ 4205 4206static bfd_boolean 4207add_symbol_adjust (struct ppc_link_hash_entry *eh, struct bfd_link_info *info) 4208{ 4209 struct ppc_link_hash_table *htab; 4210 struct ppc_link_hash_entry *fdh; 4211 4212 if (eh->elf.root.type == bfd_link_hash_indirect) 4213 return TRUE; 4214 4215 if (eh->elf.root.type == bfd_link_hash_warning) 4216 eh = (struct ppc_link_hash_entry *) eh->elf.root.u.i.link; 4217 4218 if (eh->elf.root.root.string[0] != '.') 4219 abort (); 4220 4221 htab = ppc_hash_table (info); 4222 fdh = get_fdh (eh, htab); 4223 if (fdh == NULL 4224 && !info->relocatable 4225 && (eh->elf.root.type == bfd_link_hash_undefined 4226 || eh->elf.root.type == bfd_link_hash_undefweak) 4227 && eh->elf.ref_regular) 4228 { 4229 /* Make an undefweak function descriptor sym, which is enough to 4230 pull in an --as-needed shared lib, but won't cause link 4231 errors. Archives are handled elsewhere. */ 4232 fdh = make_fdh (info, eh); 4233 if (fdh == NULL) 4234 return FALSE; 4235 else 4236 fdh->elf.ref_regular = 1; 4237 } 4238 else if (fdh != NULL) 4239 { 4240 unsigned entry_vis = ELF_ST_VISIBILITY (eh->elf.other) - 1; 4241 unsigned descr_vis = ELF_ST_VISIBILITY (fdh->elf.other) - 1; 4242 if (entry_vis < descr_vis) 4243 fdh->elf.other += entry_vis - descr_vis; 4244 else if (entry_vis > descr_vis) 4245 eh->elf.other += descr_vis - entry_vis; 4246 4247 if ((fdh->elf.root.type == bfd_link_hash_defined 4248 || fdh->elf.root.type == bfd_link_hash_defweak) 4249 && eh->elf.root.type == bfd_link_hash_undefined) 4250 { 4251 eh->elf.root.type = bfd_link_hash_undefweak; 4252 eh->was_undefined = 1; 4253 htab->twiddled_syms = 1; 4254 } 4255 } 4256 4257 return TRUE; 4258} 4259 4260/* Process list of dot-symbols we made in link_hash_newfunc. */ 4261 4262static bfd_boolean 4263ppc64_elf_check_directives (bfd *ibfd, struct bfd_link_info *info) 4264{ 4265 struct ppc_link_hash_table *htab; 4266 struct ppc_link_hash_entry **p, *eh; 4267 4268 htab = ppc_hash_table (info); 4269 if (!is_ppc64_elf_target (htab->elf.root.creator)) 4270 return TRUE; 4271 4272 if (is_ppc64_elf_target (ibfd->xvec)) 4273 { 4274 p = &htab->dot_syms; 4275 while ((eh = *p) != NULL) 4276 { 4277 *p = NULL; 4278 if (!add_symbol_adjust (eh, info)) 4279 return FALSE; 4280 p = &eh->u.next_dot_sym; 4281 } 4282 } 4283 4284 /* Clear the list for non-ppc64 input files. */ 4285 p = &htab->dot_syms; 4286 while ((eh = *p) != NULL) 4287 { 4288 *p = NULL; 4289 p = &eh->u.next_dot_sym; 4290 } 4291 4292 /* We need to fix the undefs list for any syms we have twiddled to 4293 undef_weak. */ 4294 if (htab->twiddled_syms) 4295 { 4296 bfd_link_repair_undef_list (&htab->elf.root); 4297 htab->twiddled_syms = 0; 4298 } 4299 return TRUE; 4300} 4301 4302/* Undo hash table changes when an --as-needed input file is determined 4303 not to be needed. */ 4304 4305static bfd_boolean 4306ppc64_elf_as_needed_cleanup (bfd *ibfd ATTRIBUTE_UNUSED, 4307 struct bfd_link_info *info) 4308{ 4309 ppc_hash_table (info)->dot_syms = NULL; 4310 return TRUE; 4311} 4312 4313static bfd_boolean 4314update_local_sym_info (bfd *abfd, Elf_Internal_Shdr *symtab_hdr, 4315 unsigned long r_symndx, bfd_vma r_addend, int tls_type) 4316{ 4317 struct got_entry **local_got_ents = elf_local_got_ents (abfd); 4318 char *local_got_tls_masks; 4319 4320 if (local_got_ents == NULL) 4321 { 4322 bfd_size_type size = symtab_hdr->sh_info; 4323 4324 size *= sizeof (*local_got_ents) + sizeof (*local_got_tls_masks); 4325 local_got_ents = bfd_zalloc (abfd, size); 4326 if (local_got_ents == NULL) 4327 return FALSE; 4328 elf_local_got_ents (abfd) = local_got_ents; 4329 } 4330 4331 if ((tls_type & TLS_EXPLICIT) == 0) 4332 { 4333 struct got_entry *ent; 4334 4335 for (ent = local_got_ents[r_symndx]; ent != NULL; ent = ent->next) 4336 if (ent->addend == r_addend 4337 && ent->owner == abfd 4338 && ent->tls_type == tls_type) 4339 break; 4340 if (ent == NULL) 4341 { 4342 bfd_size_type amt = sizeof (*ent); 4343 ent = bfd_alloc (abfd, amt); 4344 if (ent == NULL) 4345 return FALSE; 4346 ent->next = local_got_ents[r_symndx]; 4347 ent->addend = r_addend; 4348 ent->owner = abfd; 4349 ent->tls_type = tls_type; 4350 ent->got.refcount = 0; 4351 local_got_ents[r_symndx] = ent; 4352 } 4353 ent->got.refcount += 1; 4354 } 4355 4356 local_got_tls_masks = (char *) (local_got_ents + symtab_hdr->sh_info); 4357 local_got_tls_masks[r_symndx] |= tls_type; 4358 return TRUE; 4359} 4360 4361static bfd_boolean 4362update_plt_info (bfd *abfd, struct ppc_link_hash_entry *eh, bfd_vma addend) 4363{ 4364 struct plt_entry *ent; 4365 4366 for (ent = eh->elf.plt.plist; ent != NULL; ent = ent->next) 4367 if (ent->addend == addend) 4368 break; 4369 if (ent == NULL) 4370 { 4371 bfd_size_type amt = sizeof (*ent); 4372 ent = bfd_alloc (abfd, amt); 4373 if (ent == NULL) 4374 return FALSE; 4375 ent->next = eh->elf.plt.plist; 4376 ent->addend = addend; 4377 ent->plt.refcount = 0; 4378 eh->elf.plt.plist = ent; 4379 } 4380 ent->plt.refcount += 1; 4381 eh->elf.needs_plt = 1; 4382 if (eh->elf.root.root.string[0] == '.' 4383 && eh->elf.root.root.string[1] != '\0') 4384 eh->is_func = 1; 4385 return TRUE; 4386} 4387 4388/* Look through the relocs for a section during the first phase, and 4389 calculate needed space in the global offset table, procedure 4390 linkage table, and dynamic reloc sections. */ 4391 4392static bfd_boolean 4393ppc64_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, 4394 asection *sec, const Elf_Internal_Rela *relocs) 4395{ 4396 struct ppc_link_hash_table *htab; 4397 Elf_Internal_Shdr *symtab_hdr; 4398 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 4399 const Elf_Internal_Rela *rel; 4400 const Elf_Internal_Rela *rel_end; 4401 asection *sreloc; 4402 asection **opd_sym_map; 4403 4404 if (info->relocatable) 4405 return TRUE; 4406 4407 /* Don't do anything special with non-loaded, non-alloced sections. 4408 In particular, any relocs in such sections should not affect GOT 4409 and PLT reference counting (ie. we don't allow them to create GOT 4410 or PLT entries), there's no possibility or desire to optimize TLS 4411 relocs, and there's not much point in propagating relocs to shared 4412 libs that the dynamic linker won't relocate. */ 4413 if ((sec->flags & SEC_ALLOC) == 0) 4414 return TRUE; 4415 4416 htab = ppc_hash_table (info); 4417 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 4418 4419 sym_hashes = elf_sym_hashes (abfd); 4420 sym_hashes_end = (sym_hashes 4421 + symtab_hdr->sh_size / sizeof (Elf64_External_Sym) 4422 - symtab_hdr->sh_info); 4423 4424 sreloc = NULL; 4425 opd_sym_map = NULL; 4426 if (strcmp (bfd_get_section_name (abfd, sec), ".opd") == 0) 4427 { 4428 /* Garbage collection needs some extra help with .opd sections. 4429 We don't want to necessarily keep everything referenced by 4430 relocs in .opd, as that would keep all functions. Instead, 4431 if we reference an .opd symbol (a function descriptor), we 4432 want to keep the function code symbol's section. This is 4433 easy for global symbols, but for local syms we need to keep 4434 information about the associated function section. Later, if 4435 edit_opd deletes entries, we'll use this array to adjust 4436 local syms in .opd. */ 4437 union opd_info { 4438 asection *func_section; 4439 long entry_adjust; 4440 }; 4441 bfd_size_type amt; 4442 4443 amt = sec->size * sizeof (union opd_info) / 8; 4444 opd_sym_map = bfd_zalloc (abfd, amt); 4445 if (opd_sym_map == NULL) 4446 return FALSE; 4447 ppc64_elf_section_data (sec)->u.opd_func_sec = opd_sym_map; 4448 BFD_ASSERT (ppc64_elf_section_data (sec)->sec_type == sec_normal); 4449 ppc64_elf_section_data (sec)->sec_type = sec_opd; 4450 } 4451 4452 if (htab->sfpr == NULL 4453 && !create_linkage_sections (htab->elf.dynobj, info)) 4454 return FALSE; 4455 4456 rel_end = relocs + sec->reloc_count; 4457 for (rel = relocs; rel < rel_end; rel++) 4458 { 4459 unsigned long r_symndx; 4460 struct elf_link_hash_entry *h; 4461 enum elf_ppc64_reloc_type r_type; 4462 int tls_type = 0; 4463 struct _ppc64_elf_section_data *ppc64_sec; 4464 4465 r_symndx = ELF64_R_SYM (rel->r_info); 4466 if (r_symndx < symtab_hdr->sh_info) 4467 h = NULL; 4468 else 4469 { 4470 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 4471 while (h->root.type == bfd_link_hash_indirect 4472 || h->root.type == bfd_link_hash_warning) 4473 h = (struct elf_link_hash_entry *) h->root.u.i.link; 4474 } 4475 4476 r_type = ELF64_R_TYPE (rel->r_info); 4477 switch (r_type) 4478 { 4479 case R_PPC64_GOT_TLSLD16: 4480 case R_PPC64_GOT_TLSLD16_LO: 4481 case R_PPC64_GOT_TLSLD16_HI: 4482 case R_PPC64_GOT_TLSLD16_HA: 4483 ppc64_tlsld_got (abfd)->refcount += 1; 4484 tls_type = TLS_TLS | TLS_LD; 4485 goto dogottls; 4486 4487 case R_PPC64_GOT_TLSGD16: 4488 case R_PPC64_GOT_TLSGD16_LO: 4489 case R_PPC64_GOT_TLSGD16_HI: 4490 case R_PPC64_GOT_TLSGD16_HA: 4491 tls_type = TLS_TLS | TLS_GD; 4492 goto dogottls; 4493 4494 case R_PPC64_GOT_TPREL16_DS: 4495 case R_PPC64_GOT_TPREL16_LO_DS: 4496 case R_PPC64_GOT_TPREL16_HI: 4497 case R_PPC64_GOT_TPREL16_HA: 4498 if (info->shared) 4499 info->flags |= DF_STATIC_TLS; 4500 tls_type = TLS_TLS | TLS_TPREL; 4501 goto dogottls; 4502 4503 case R_PPC64_GOT_DTPREL16_DS: 4504 case R_PPC64_GOT_DTPREL16_LO_DS: 4505 case R_PPC64_GOT_DTPREL16_HI: 4506 case R_PPC64_GOT_DTPREL16_HA: 4507 tls_type = TLS_TLS | TLS_DTPREL; 4508 dogottls: 4509 sec->has_tls_reloc = 1; 4510 /* Fall thru */ 4511 4512 case R_PPC64_GOT16: 4513 case R_PPC64_GOT16_DS: 4514 case R_PPC64_GOT16_HA: 4515 case R_PPC64_GOT16_HI: 4516 case R_PPC64_GOT16_LO: 4517 case R_PPC64_GOT16_LO_DS: 4518 /* This symbol requires a global offset table entry. */ 4519 sec->has_toc_reloc = 1; 4520 if (ppc64_elf_tdata (abfd)->got == NULL 4521 && !create_got_section (abfd, info)) 4522 return FALSE; 4523 4524 if (h != NULL) 4525 { 4526 struct ppc_link_hash_entry *eh; 4527 struct got_entry *ent; 4528 4529 eh = (struct ppc_link_hash_entry *) h; 4530 for (ent = eh->elf.got.glist; ent != NULL; ent = ent->next) 4531 if (ent->addend == rel->r_addend 4532 && ent->owner == abfd 4533 && ent->tls_type == tls_type) 4534 break; 4535 if (ent == NULL) 4536 { 4537 bfd_size_type amt = sizeof (*ent); 4538 ent = bfd_alloc (abfd, amt); 4539 if (ent == NULL) 4540 return FALSE; 4541 ent->next = eh->elf.got.glist; 4542 ent->addend = rel->r_addend; 4543 ent->owner = abfd; 4544 ent->tls_type = tls_type; 4545 ent->got.refcount = 0; 4546 eh->elf.got.glist = ent; 4547 } 4548 ent->got.refcount += 1; 4549 eh->tls_mask |= tls_type; 4550 } 4551 else 4552 /* This is a global offset table entry for a local symbol. */ 4553 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx, 4554 rel->r_addend, tls_type)) 4555 return FALSE; 4556 break; 4557 4558 case R_PPC64_PLT16_HA: 4559 case R_PPC64_PLT16_HI: 4560 case R_PPC64_PLT16_LO: 4561 case R_PPC64_PLT32: 4562 case R_PPC64_PLT64: 4563 /* This symbol requires a procedure linkage table entry. We 4564 actually build the entry in adjust_dynamic_symbol, 4565 because this might be a case of linking PIC code without 4566 linking in any dynamic objects, in which case we don't 4567 need to generate a procedure linkage table after all. */ 4568 if (h == NULL) 4569 { 4570 /* It does not make sense to have a procedure linkage 4571 table entry for a local symbol. */ 4572 bfd_set_error (bfd_error_bad_value); 4573 return FALSE; 4574 } 4575 else 4576 if (!update_plt_info (abfd, (struct ppc_link_hash_entry *) h, 4577 rel->r_addend)) 4578 return FALSE; 4579 break; 4580 4581 /* The following relocations don't need to propagate the 4582 relocation if linking a shared object since they are 4583 section relative. */ 4584 case R_PPC64_SECTOFF: 4585 case R_PPC64_SECTOFF_LO: 4586 case R_PPC64_SECTOFF_HI: 4587 case R_PPC64_SECTOFF_HA: 4588 case R_PPC64_SECTOFF_DS: 4589 case R_PPC64_SECTOFF_LO_DS: 4590 case R_PPC64_DTPREL16: 4591 case R_PPC64_DTPREL16_LO: 4592 case R_PPC64_DTPREL16_HI: 4593 case R_PPC64_DTPREL16_HA: 4594 case R_PPC64_DTPREL16_DS: 4595 case R_PPC64_DTPREL16_LO_DS: 4596 case R_PPC64_DTPREL16_HIGHER: 4597 case R_PPC64_DTPREL16_HIGHERA: 4598 case R_PPC64_DTPREL16_HIGHEST: 4599 case R_PPC64_DTPREL16_HIGHESTA: 4600 break; 4601 4602 /* Nor do these. */ 4603 case R_PPC64_TOC16: 4604 case R_PPC64_TOC16_LO: 4605 case R_PPC64_TOC16_HI: 4606 case R_PPC64_TOC16_HA: 4607 case R_PPC64_TOC16_DS: 4608 case R_PPC64_TOC16_LO_DS: 4609 sec->has_toc_reloc = 1; 4610 break; 4611 4612 /* This relocation describes the C++ object vtable hierarchy. 4613 Reconstruct it for later use during GC. */ 4614 case R_PPC64_GNU_VTINHERIT: 4615 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 4616 return FALSE; 4617 break; 4618 4619 /* This relocation describes which C++ vtable entries are actually 4620 used. Record for later use during GC. */ 4621 case R_PPC64_GNU_VTENTRY: 4622 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 4623 return FALSE; 4624 break; 4625 4626 case R_PPC64_REL14: 4627 case R_PPC64_REL14_BRTAKEN: 4628 case R_PPC64_REL14_BRNTAKEN: 4629 { 4630 asection *dest = NULL; 4631 4632 /* Heuristic: If jumping outside our section, chances are 4633 we are going to need a stub. */ 4634 if (h != NULL) 4635 { 4636 /* If the sym is weak it may be overridden later, so 4637 don't assume we know where a weak sym lives. */ 4638 if (h->root.type == bfd_link_hash_defined) 4639 dest = h->root.u.def.section; 4640 } 4641 else 4642 dest = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 4643 sec, r_symndx); 4644 if (dest != sec) 4645 ppc64_elf_section_data (sec)->has_14bit_branch = 1; 4646 } 4647 /* Fall through. */ 4648 4649 case R_PPC64_REL24: 4650 if (h != NULL) 4651 { 4652 /* We may need a .plt entry if the function this reloc 4653 refers to is in a shared lib. */ 4654 if (!update_plt_info (abfd, (struct ppc_link_hash_entry *) h, 4655 rel->r_addend)) 4656 return FALSE; 4657 if (h == &htab->tls_get_addr->elf 4658 || h == &htab->tls_get_addr_fd->elf) 4659 sec->has_tls_reloc = 1; 4660 else if (htab->tls_get_addr == NULL 4661 && CONST_STRNEQ (h->root.root.string, ".__tls_get_addr") 4662 && (h->root.root.string[15] == 0 4663 || h->root.root.string[15] == '@')) 4664 { 4665 htab->tls_get_addr = (struct ppc_link_hash_entry *) h; 4666 sec->has_tls_reloc = 1; 4667 } 4668 else if (htab->tls_get_addr_fd == NULL 4669 && CONST_STRNEQ (h->root.root.string, "__tls_get_addr") 4670 && (h->root.root.string[14] == 0 4671 || h->root.root.string[14] == '@')) 4672 { 4673 htab->tls_get_addr_fd = (struct ppc_link_hash_entry *) h; 4674 sec->has_tls_reloc = 1; 4675 } 4676 } 4677 break; 4678 4679 case R_PPC64_TPREL64: 4680 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_TPREL; 4681 if (info->shared) 4682 info->flags |= DF_STATIC_TLS; 4683 goto dotlstoc; 4684 4685 case R_PPC64_DTPMOD64: 4686 if (rel + 1 < rel_end 4687 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64) 4688 && rel[1].r_offset == rel->r_offset + 8) 4689 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_GD; 4690 else 4691 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_LD; 4692 goto dotlstoc; 4693 4694 case R_PPC64_DTPREL64: 4695 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_DTPREL; 4696 if (rel != relocs 4697 && rel[-1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPMOD64) 4698 && rel[-1].r_offset == rel->r_offset - 8) 4699 /* This is the second reloc of a dtpmod, dtprel pair. 4700 Don't mark with TLS_DTPREL. */ 4701 goto dodyn; 4702 4703 dotlstoc: 4704 sec->has_tls_reloc = 1; 4705 if (h != NULL) 4706 { 4707 struct ppc_link_hash_entry *eh; 4708 eh = (struct ppc_link_hash_entry *) h; 4709 eh->tls_mask |= tls_type; 4710 } 4711 else 4712 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx, 4713 rel->r_addend, tls_type)) 4714 return FALSE; 4715 4716 ppc64_sec = ppc64_elf_section_data (sec); 4717 if (ppc64_sec->sec_type != sec_toc) 4718 { 4719 /* One extra to simplify get_tls_mask. */ 4720 bfd_size_type amt = sec->size * sizeof (unsigned) / 8 + 1; 4721 ppc64_sec->u.t_symndx = bfd_zalloc (abfd, amt); 4722 if (ppc64_sec->u.t_symndx == NULL) 4723 return FALSE; 4724 BFD_ASSERT (ppc64_sec->sec_type == sec_normal); 4725 ppc64_sec->sec_type = sec_toc; 4726 } 4727 BFD_ASSERT (rel->r_offset % 8 == 0); 4728 ppc64_sec->u.t_symndx[rel->r_offset / 8] = r_symndx; 4729 4730 /* Mark the second slot of a GD or LD entry. 4731 -1 to indicate GD and -2 to indicate LD. */ 4732 if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_GD)) 4733 ppc64_sec->u.t_symndx[rel->r_offset / 8 + 1] = -1; 4734 else if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_LD)) 4735 ppc64_sec->u.t_symndx[rel->r_offset / 8 + 1] = -2; 4736 goto dodyn; 4737 4738 case R_PPC64_TPREL16: 4739 case R_PPC64_TPREL16_LO: 4740 case R_PPC64_TPREL16_HI: 4741 case R_PPC64_TPREL16_HA: 4742 case R_PPC64_TPREL16_DS: 4743 case R_PPC64_TPREL16_LO_DS: 4744 case R_PPC64_TPREL16_HIGHER: 4745 case R_PPC64_TPREL16_HIGHERA: 4746 case R_PPC64_TPREL16_HIGHEST: 4747 case R_PPC64_TPREL16_HIGHESTA: 4748 if (info->shared) 4749 { 4750 info->flags |= DF_STATIC_TLS; 4751 goto dodyn; 4752 } 4753 break; 4754 4755 case R_PPC64_ADDR64: 4756 if (opd_sym_map != NULL 4757 && rel + 1 < rel_end 4758 && ELF64_R_TYPE ((rel + 1)->r_info) == R_PPC64_TOC) 4759 { 4760 if (h != NULL) 4761 { 4762 if (h->root.root.string[0] == '.' 4763 && h->root.root.string[1] != 0 4764 && get_fdh ((struct ppc_link_hash_entry *) h, htab)) 4765 ; 4766 else 4767 ((struct ppc_link_hash_entry *) h)->is_func = 1; 4768 } 4769 else 4770 { 4771 asection *s; 4772 4773 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, sec, 4774 r_symndx); 4775 if (s == NULL) 4776 return FALSE; 4777 else if (s != sec) 4778 opd_sym_map[rel->r_offset / 8] = s; 4779 } 4780 } 4781 /* Fall through. */ 4782 4783 case R_PPC64_REL30: 4784 case R_PPC64_REL32: 4785 case R_PPC64_REL64: 4786 case R_PPC64_ADDR14: 4787 case R_PPC64_ADDR14_BRNTAKEN: 4788 case R_PPC64_ADDR14_BRTAKEN: 4789 case R_PPC64_ADDR16: 4790 case R_PPC64_ADDR16_DS: 4791 case R_PPC64_ADDR16_HA: 4792 case R_PPC64_ADDR16_HI: 4793 case R_PPC64_ADDR16_HIGHER: 4794 case R_PPC64_ADDR16_HIGHERA: 4795 case R_PPC64_ADDR16_HIGHEST: 4796 case R_PPC64_ADDR16_HIGHESTA: 4797 case R_PPC64_ADDR16_LO: 4798 case R_PPC64_ADDR16_LO_DS: 4799 case R_PPC64_ADDR24: 4800 case R_PPC64_ADDR32: 4801 case R_PPC64_UADDR16: 4802 case R_PPC64_UADDR32: 4803 case R_PPC64_UADDR64: 4804 case R_PPC64_TOC: 4805 if (h != NULL && !info->shared) 4806 /* We may need a copy reloc. */ 4807 h->non_got_ref = 1; 4808 4809 /* Don't propagate .opd relocs. */ 4810 if (NO_OPD_RELOCS && opd_sym_map != NULL) 4811 break; 4812 4813 /* If we are creating a shared library, and this is a reloc 4814 against a global symbol, or a non PC relative reloc 4815 against a local symbol, then we need to copy the reloc 4816 into the shared library. However, if we are linking with 4817 -Bsymbolic, we do not need to copy a reloc against a 4818 global symbol which is defined in an object we are 4819 including in the link (i.e., DEF_REGULAR is set). At 4820 this point we have not seen all the input files, so it is 4821 possible that DEF_REGULAR is not set now but will be set 4822 later (it is never cleared). In case of a weak definition, 4823 DEF_REGULAR may be cleared later by a strong definition in 4824 a shared library. We account for that possibility below by 4825 storing information in the dyn_relocs field of the hash 4826 table entry. A similar situation occurs when creating 4827 shared libraries and symbol visibility changes render the 4828 symbol local. 4829 4830 If on the other hand, we are creating an executable, we 4831 may need to keep relocations for symbols satisfied by a 4832 dynamic library if we manage to avoid copy relocs for the 4833 symbol. */ 4834 dodyn: 4835 if ((info->shared 4836 && (MUST_BE_DYN_RELOC (r_type) 4837 || (h != NULL 4838 && (! info->symbolic 4839 || h->root.type == bfd_link_hash_defweak 4840 || !h->def_regular)))) 4841 || (ELIMINATE_COPY_RELOCS 4842 && !info->shared 4843 && h != NULL 4844 && (h->root.type == bfd_link_hash_defweak 4845 || !h->def_regular))) 4846 { 4847 struct ppc_dyn_relocs *p; 4848 struct ppc_dyn_relocs **head; 4849 4850 /* We must copy these reloc types into the output file. 4851 Create a reloc section in dynobj and make room for 4852 this reloc. */ 4853 if (sreloc == NULL) 4854 { 4855 const char *name; 4856 bfd *dynobj; 4857 4858 name = (bfd_elf_string_from_elf_section 4859 (abfd, 4860 elf_elfheader (abfd)->e_shstrndx, 4861 elf_section_data (sec)->rel_hdr.sh_name)); 4862 if (name == NULL) 4863 return FALSE; 4864 4865 if (! CONST_STRNEQ (name, ".rela") 4866 || strcmp (bfd_get_section_name (abfd, sec), 4867 name + 5) != 0) 4868 { 4869 (*_bfd_error_handler) 4870 (_("%B: bad relocation section name `%s\'"), 4871 abfd, name); 4872 bfd_set_error (bfd_error_bad_value); 4873 } 4874 4875 dynobj = htab->elf.dynobj; 4876 sreloc = bfd_get_section_by_name (dynobj, name); 4877 if (sreloc == NULL) 4878 { 4879 flagword flags; 4880 4881 flags = (SEC_HAS_CONTENTS | SEC_READONLY 4882 | SEC_IN_MEMORY | SEC_LINKER_CREATED 4883 | SEC_ALLOC | SEC_LOAD); 4884 sreloc = bfd_make_section_with_flags (dynobj, 4885 name, 4886 flags); 4887 if (sreloc == NULL 4888 || ! bfd_set_section_alignment (dynobj, sreloc, 3)) 4889 return FALSE; 4890 } 4891 elf_section_data (sec)->sreloc = sreloc; 4892 } 4893 4894 /* If this is a global symbol, we count the number of 4895 relocations we need for this symbol. */ 4896 if (h != NULL) 4897 { 4898 head = &((struct ppc_link_hash_entry *) h)->dyn_relocs; 4899 } 4900 else 4901 { 4902 /* Track dynamic relocs needed for local syms too. 4903 We really need local syms available to do this 4904 easily. Oh well. */ 4905 4906 asection *s; 4907 void *vpp; 4908 4909 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 4910 sec, r_symndx); 4911 if (s == NULL) 4912 return FALSE; 4913 4914 vpp = &elf_section_data (s)->local_dynrel; 4915 head = (struct ppc_dyn_relocs **) vpp; 4916 } 4917 4918 p = *head; 4919 if (p == NULL || p->sec != sec) 4920 { 4921 p = bfd_alloc (htab->elf.dynobj, sizeof *p); 4922 if (p == NULL) 4923 return FALSE; 4924 p->next = *head; 4925 *head = p; 4926 p->sec = sec; 4927 p->count = 0; 4928 p->pc_count = 0; 4929 } 4930 4931 p->count += 1; 4932 if (!MUST_BE_DYN_RELOC (r_type)) 4933 p->pc_count += 1; 4934 } 4935 break; 4936 4937 default: 4938 break; 4939 } 4940 } 4941 4942 return TRUE; 4943} 4944 4945/* OFFSET in OPD_SEC specifies a function descriptor. Return the address 4946 of the code entry point, and its section. */ 4947 4948static bfd_vma 4949opd_entry_value (asection *opd_sec, 4950 bfd_vma offset, 4951 asection **code_sec, 4952 bfd_vma *code_off) 4953{ 4954 bfd *opd_bfd = opd_sec->owner; 4955 Elf_Internal_Rela *relocs; 4956 Elf_Internal_Rela *lo, *hi, *look; 4957 bfd_vma val; 4958 4959 /* No relocs implies we are linking a --just-symbols object. */ 4960 if (opd_sec->reloc_count == 0) 4961 { 4962 bfd_vma val; 4963 4964 if (!bfd_get_section_contents (opd_bfd, opd_sec, &val, offset, 8)) 4965 return (bfd_vma) -1; 4966 4967 if (code_sec != NULL) 4968 { 4969 asection *sec, *likely = NULL; 4970 for (sec = opd_bfd->sections; sec != NULL; sec = sec->next) 4971 if (sec->vma <= val 4972 && (sec->flags & SEC_LOAD) != 0 4973 && (sec->flags & SEC_ALLOC) != 0) 4974 likely = sec; 4975 if (likely != NULL) 4976 { 4977 *code_sec = likely; 4978 if (code_off != NULL) 4979 *code_off = val - likely->vma; 4980 } 4981 } 4982 return val; 4983 } 4984 4985 relocs = ppc64_elf_tdata (opd_bfd)->opd_relocs; 4986 if (relocs == NULL) 4987 relocs = _bfd_elf_link_read_relocs (opd_bfd, opd_sec, NULL, NULL, TRUE); 4988 4989 /* Go find the opd reloc at the sym address. */ 4990 lo = relocs; 4991 BFD_ASSERT (lo != NULL); 4992 hi = lo + opd_sec->reloc_count - 1; /* ignore last reloc */ 4993 val = (bfd_vma) -1; 4994 while (lo < hi) 4995 { 4996 look = lo + (hi - lo) / 2; 4997 if (look->r_offset < offset) 4998 lo = look + 1; 4999 else if (look->r_offset > offset) 5000 hi = look; 5001 else 5002 { 5003 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (opd_bfd)->symtab_hdr; 5004 if (ELF64_R_TYPE (look->r_info) == R_PPC64_ADDR64 5005 && ELF64_R_TYPE ((look + 1)->r_info) == R_PPC64_TOC) 5006 { 5007 unsigned long symndx = ELF64_R_SYM (look->r_info); 5008 asection *sec; 5009 5010 if (symndx < symtab_hdr->sh_info) 5011 { 5012 Elf_Internal_Sym *sym; 5013 5014 sym = (Elf_Internal_Sym *) symtab_hdr->contents; 5015 if (sym == NULL) 5016 { 5017 sym = bfd_elf_get_elf_syms (opd_bfd, symtab_hdr, 5018 symtab_hdr->sh_info, 5019 0, NULL, NULL, NULL); 5020 if (sym == NULL) 5021 break; 5022 symtab_hdr->contents = (bfd_byte *) sym; 5023 } 5024 5025 sym += symndx; 5026 val = sym->st_value; 5027 sec = NULL; 5028 if ((sym->st_shndx != SHN_UNDEF 5029 && sym->st_shndx < SHN_LORESERVE) 5030 || sym->st_shndx > SHN_HIRESERVE) 5031 sec = bfd_section_from_elf_index (opd_bfd, sym->st_shndx); 5032 BFD_ASSERT ((sec->flags & SEC_MERGE) == 0); 5033 } 5034 else 5035 { 5036 struct elf_link_hash_entry **sym_hashes; 5037 struct elf_link_hash_entry *rh; 5038 5039 sym_hashes = elf_sym_hashes (opd_bfd); 5040 rh = sym_hashes[symndx - symtab_hdr->sh_info]; 5041 while (rh->root.type == bfd_link_hash_indirect 5042 || rh->root.type == bfd_link_hash_warning) 5043 rh = ((struct elf_link_hash_entry *) rh->root.u.i.link); 5044 BFD_ASSERT (rh->root.type == bfd_link_hash_defined 5045 || rh->root.type == bfd_link_hash_defweak); 5046 val = rh->root.u.def.value; 5047 sec = rh->root.u.def.section; 5048 } 5049 val += look->r_addend; 5050 if (code_off != NULL) 5051 *code_off = val; 5052 if (code_sec != NULL) 5053 *code_sec = sec; 5054 if (sec != NULL && sec->output_section != NULL) 5055 val += sec->output_section->vma + sec->output_offset; 5056 } 5057 break; 5058 } 5059 } 5060 5061 return val; 5062} 5063 5064/* Mark sections containing dynamically referenced symbols. When 5065 building shared libraries, we must assume that any visible symbol is 5066 referenced. */ 5067 5068static bfd_boolean 5069ppc64_elf_gc_mark_dynamic_ref (struct elf_link_hash_entry *h, void *inf) 5070{ 5071 struct bfd_link_info *info = (struct bfd_link_info *) inf; 5072 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) h; 5073 5074 if (eh->elf.root.type == bfd_link_hash_warning) 5075 eh = (struct ppc_link_hash_entry *) eh->elf.root.u.i.link; 5076 5077 /* Dynamic linking info is on the func descriptor sym. */ 5078 if (eh->oh != NULL 5079 && eh->oh->is_func_descriptor 5080 && (eh->oh->elf.root.type == bfd_link_hash_defined 5081 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5082 eh = eh->oh; 5083 5084 if ((eh->elf.root.type == bfd_link_hash_defined 5085 || eh->elf.root.type == bfd_link_hash_defweak) 5086 && (eh->elf.ref_dynamic 5087 || (!info->executable 5088 && eh->elf.def_regular 5089 && ELF_ST_VISIBILITY (eh->elf.other) != STV_INTERNAL 5090 && ELF_ST_VISIBILITY (eh->elf.other) != STV_HIDDEN))) 5091 { 5092 asection *code_sec; 5093 5094 eh->elf.root.u.def.section->flags |= SEC_KEEP; 5095 5096 /* Function descriptor syms cause the associated 5097 function code sym section to be marked. */ 5098 if (eh->is_func_descriptor 5099 && (eh->oh->elf.root.type == bfd_link_hash_defined 5100 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5101 eh->oh->elf.root.u.def.section->flags |= SEC_KEEP; 5102 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5103 && opd_entry_value (eh->elf.root.u.def.section, 5104 eh->elf.root.u.def.value, 5105 &code_sec, NULL) != (bfd_vma) -1) 5106 code_sec->flags |= SEC_KEEP; 5107 } 5108 5109 return TRUE; 5110} 5111 5112/* Return the section that should be marked against GC for a given 5113 relocation. */ 5114 5115static asection * 5116ppc64_elf_gc_mark_hook (asection *sec, 5117 struct bfd_link_info *info, 5118 Elf_Internal_Rela *rel, 5119 struct elf_link_hash_entry *h, 5120 Elf_Internal_Sym *sym) 5121{ 5122 asection *rsec; 5123 5124 /* First mark all our entry sym sections. */ 5125 if (info->gc_sym_list != NULL) 5126 { 5127 struct ppc_link_hash_table *htab = ppc_hash_table (info); 5128 struct bfd_sym_chain *sym = info->gc_sym_list; 5129 5130 info->gc_sym_list = NULL; 5131 for (; sym != NULL; sym = sym->next) 5132 { 5133 struct ppc_link_hash_entry *eh; 5134 5135 eh = (struct ppc_link_hash_entry *) 5136 elf_link_hash_lookup (&htab->elf, sym->name, FALSE, FALSE, FALSE); 5137 if (eh == NULL) 5138 continue; 5139 if (eh->elf.root.type != bfd_link_hash_defined 5140 && eh->elf.root.type != bfd_link_hash_defweak) 5141 continue; 5142 5143 if (eh->is_func_descriptor 5144 && (eh->oh->elf.root.type == bfd_link_hash_defined 5145 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5146 rsec = eh->oh->elf.root.u.def.section; 5147 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5148 && opd_entry_value (eh->elf.root.u.def.section, 5149 eh->elf.root.u.def.value, 5150 &rsec, NULL) != (bfd_vma) -1) 5151 ; 5152 else 5153 continue; 5154 5155 if (!rsec->gc_mark) 5156 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook); 5157 5158 rsec = eh->elf.root.u.def.section; 5159 if (!rsec->gc_mark) 5160 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook); 5161 } 5162 } 5163 5164 /* Syms return NULL if we're marking .opd, so we avoid marking all 5165 function sections, as all functions are referenced in .opd. */ 5166 rsec = NULL; 5167 if (get_opd_info (sec) != NULL) 5168 return rsec; 5169 5170 if (h != NULL) 5171 { 5172 enum elf_ppc64_reloc_type r_type; 5173 struct ppc_link_hash_entry *eh; 5174 5175 r_type = ELF64_R_TYPE (rel->r_info); 5176 switch (r_type) 5177 { 5178 case R_PPC64_GNU_VTINHERIT: 5179 case R_PPC64_GNU_VTENTRY: 5180 break; 5181 5182 default: 5183 switch (h->root.type) 5184 { 5185 case bfd_link_hash_defined: 5186 case bfd_link_hash_defweak: 5187 eh = (struct ppc_link_hash_entry *) h; 5188 if (eh->oh != NULL 5189 && eh->oh->is_func_descriptor 5190 && (eh->oh->elf.root.type == bfd_link_hash_defined 5191 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5192 eh = eh->oh; 5193 5194 /* Function descriptor syms cause the associated 5195 function code sym section to be marked. */ 5196 if (eh->is_func_descriptor 5197 && (eh->oh->elf.root.type == bfd_link_hash_defined 5198 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5199 { 5200 /* They also mark their opd section. */ 5201 if (!eh->elf.root.u.def.section->gc_mark) 5202 _bfd_elf_gc_mark (info, eh->elf.root.u.def.section, 5203 ppc64_elf_gc_mark_hook); 5204 5205 rsec = eh->oh->elf.root.u.def.section; 5206 } 5207 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5208 && opd_entry_value (eh->elf.root.u.def.section, 5209 eh->elf.root.u.def.value, 5210 &rsec, NULL) != (bfd_vma) -1) 5211 { 5212 if (!eh->elf.root.u.def.section->gc_mark) 5213 _bfd_elf_gc_mark (info, eh->elf.root.u.def.section, 5214 ppc64_elf_gc_mark_hook); 5215 } 5216 else 5217 rsec = h->root.u.def.section; 5218 break; 5219 5220 case bfd_link_hash_common: 5221 rsec = h->root.u.c.p->section; 5222 break; 5223 5224 default: 5225 break; 5226 } 5227 } 5228 } 5229 else 5230 { 5231 asection **opd_sym_section; 5232 5233 rsec = bfd_section_from_elf_index (sec->owner, sym->st_shndx); 5234 opd_sym_section = get_opd_info (rsec); 5235 if (opd_sym_section != NULL) 5236 { 5237 if (!rsec->gc_mark) 5238 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook); 5239 5240 rsec = opd_sym_section[(sym->st_value + rel->r_addend) / 8]; 5241 } 5242 } 5243 5244 return rsec; 5245} 5246 5247/* Update the .got, .plt. and dynamic reloc reference counts for the 5248 section being removed. */ 5249 5250static bfd_boolean 5251ppc64_elf_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, 5252 asection *sec, const Elf_Internal_Rela *relocs) 5253{ 5254 struct ppc_link_hash_table *htab; 5255 Elf_Internal_Shdr *symtab_hdr; 5256 struct elf_link_hash_entry **sym_hashes; 5257 struct got_entry **local_got_ents; 5258 const Elf_Internal_Rela *rel, *relend; 5259 5260 if ((sec->flags & SEC_ALLOC) == 0) 5261 return TRUE; 5262 5263 elf_section_data (sec)->local_dynrel = NULL; 5264 5265 htab = ppc_hash_table (info); 5266 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 5267 sym_hashes = elf_sym_hashes (abfd); 5268 local_got_ents = elf_local_got_ents (abfd); 5269 5270 relend = relocs + sec->reloc_count; 5271 for (rel = relocs; rel < relend; rel++) 5272 { 5273 unsigned long r_symndx; 5274 enum elf_ppc64_reloc_type r_type; 5275 struct elf_link_hash_entry *h = NULL; 5276 char tls_type = 0; 5277 5278 r_symndx = ELF64_R_SYM (rel->r_info); 5279 r_type = ELF64_R_TYPE (rel->r_info); 5280 if (r_symndx >= symtab_hdr->sh_info) 5281 { 5282 struct ppc_link_hash_entry *eh; 5283 struct ppc_dyn_relocs **pp; 5284 struct ppc_dyn_relocs *p; 5285 5286 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 5287 while (h->root.type == bfd_link_hash_indirect 5288 || h->root.type == bfd_link_hash_warning) 5289 h = (struct elf_link_hash_entry *) h->root.u.i.link; 5290 eh = (struct ppc_link_hash_entry *) h; 5291 5292 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 5293 if (p->sec == sec) 5294 { 5295 /* Everything must go for SEC. */ 5296 *pp = p->next; 5297 break; 5298 } 5299 } 5300 5301 switch (r_type) 5302 { 5303 case R_PPC64_GOT_TLSLD16: 5304 case R_PPC64_GOT_TLSLD16_LO: 5305 case R_PPC64_GOT_TLSLD16_HI: 5306 case R_PPC64_GOT_TLSLD16_HA: 5307 ppc64_tlsld_got (abfd)->refcount -= 1; 5308 tls_type = TLS_TLS | TLS_LD; 5309 goto dogot; 5310 5311 case R_PPC64_GOT_TLSGD16: 5312 case R_PPC64_GOT_TLSGD16_LO: 5313 case R_PPC64_GOT_TLSGD16_HI: 5314 case R_PPC64_GOT_TLSGD16_HA: 5315 tls_type = TLS_TLS | TLS_GD; 5316 goto dogot; 5317 5318 case R_PPC64_GOT_TPREL16_DS: 5319 case R_PPC64_GOT_TPREL16_LO_DS: 5320 case R_PPC64_GOT_TPREL16_HI: 5321 case R_PPC64_GOT_TPREL16_HA: 5322 tls_type = TLS_TLS | TLS_TPREL; 5323 goto dogot; 5324 5325 case R_PPC64_GOT_DTPREL16_DS: 5326 case R_PPC64_GOT_DTPREL16_LO_DS: 5327 case R_PPC64_GOT_DTPREL16_HI: 5328 case R_PPC64_GOT_DTPREL16_HA: 5329 tls_type = TLS_TLS | TLS_DTPREL; 5330 goto dogot; 5331 5332 case R_PPC64_GOT16: 5333 case R_PPC64_GOT16_DS: 5334 case R_PPC64_GOT16_HA: 5335 case R_PPC64_GOT16_HI: 5336 case R_PPC64_GOT16_LO: 5337 case R_PPC64_GOT16_LO_DS: 5338 dogot: 5339 { 5340 struct got_entry *ent; 5341 5342 if (h != NULL) 5343 ent = h->got.glist; 5344 else 5345 ent = local_got_ents[r_symndx]; 5346 5347 for (; ent != NULL; ent = ent->next) 5348 if (ent->addend == rel->r_addend 5349 && ent->owner == abfd 5350 && ent->tls_type == tls_type) 5351 break; 5352 if (ent == NULL) 5353 abort (); 5354 if (ent->got.refcount > 0) 5355 ent->got.refcount -= 1; 5356 } 5357 break; 5358 5359 case R_PPC64_PLT16_HA: 5360 case R_PPC64_PLT16_HI: 5361 case R_PPC64_PLT16_LO: 5362 case R_PPC64_PLT32: 5363 case R_PPC64_PLT64: 5364 case R_PPC64_REL14: 5365 case R_PPC64_REL14_BRNTAKEN: 5366 case R_PPC64_REL14_BRTAKEN: 5367 case R_PPC64_REL24: 5368 if (h != NULL) 5369 { 5370 struct plt_entry *ent; 5371 5372 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 5373 if (ent->addend == rel->r_addend) 5374 break; 5375 if (ent == NULL) 5376 abort (); 5377 if (ent->plt.refcount > 0) 5378 ent->plt.refcount -= 1; 5379 } 5380 break; 5381 5382 default: 5383 break; 5384 } 5385 } 5386 return TRUE; 5387} 5388 5389/* The maximum size of .sfpr. */ 5390#define SFPR_MAX (218*4) 5391 5392struct sfpr_def_parms 5393{ 5394 const char name[12]; 5395 unsigned char lo, hi; 5396 bfd_byte * (*write_ent) (bfd *, bfd_byte *, int); 5397 bfd_byte * (*write_tail) (bfd *, bfd_byte *, int); 5398}; 5399 5400/* Auto-generate _save*, _rest* functions in .sfpr. */ 5401 5402static unsigned int 5403sfpr_define (struct bfd_link_info *info, const struct sfpr_def_parms *parm) 5404{ 5405 struct ppc_link_hash_table *htab = ppc_hash_table (info); 5406 unsigned int i; 5407 size_t len = strlen (parm->name); 5408 bfd_boolean writing = FALSE; 5409 char sym[16]; 5410 5411 memcpy (sym, parm->name, len); 5412 sym[len + 2] = 0; 5413 5414 for (i = parm->lo; i <= parm->hi; i++) 5415 { 5416 struct elf_link_hash_entry *h; 5417 5418 sym[len + 0] = i / 10 + '0'; 5419 sym[len + 1] = i % 10 + '0'; 5420 h = elf_link_hash_lookup (&htab->elf, sym, FALSE, FALSE, TRUE); 5421 if (h != NULL 5422 && !h->def_regular) 5423 { 5424 h->root.type = bfd_link_hash_defined; 5425 h->root.u.def.section = htab->sfpr; 5426 h->root.u.def.value = htab->sfpr->size; 5427 h->type = STT_FUNC; 5428 h->def_regular = 1; 5429 _bfd_elf_link_hash_hide_symbol (info, h, TRUE); 5430 writing = TRUE; 5431 if (htab->sfpr->contents == NULL) 5432 { 5433 htab->sfpr->contents = bfd_alloc (htab->elf.dynobj, SFPR_MAX); 5434 if (htab->sfpr->contents == NULL) 5435 return FALSE; 5436 } 5437 } 5438 if (writing) 5439 { 5440 bfd_byte *p = htab->sfpr->contents + htab->sfpr->size; 5441 if (i != parm->hi) 5442 p = (*parm->write_ent) (htab->elf.dynobj, p, i); 5443 else 5444 p = (*parm->write_tail) (htab->elf.dynobj, p, i); 5445 htab->sfpr->size = p - htab->sfpr->contents; 5446 } 5447 } 5448 5449 return TRUE; 5450} 5451 5452static bfd_byte * 5453savegpr0 (bfd *abfd, bfd_byte *p, int r) 5454{ 5455 bfd_put_32 (abfd, STD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5456 return p + 4; 5457} 5458 5459static bfd_byte * 5460savegpr0_tail (bfd *abfd, bfd_byte *p, int r) 5461{ 5462 p = savegpr0 (abfd, p, r); 5463 bfd_put_32 (abfd, STD_R0_0R1 + 16, p); 5464 p = p + 4; 5465 bfd_put_32 (abfd, BLR, p); 5466 return p + 4; 5467} 5468 5469static bfd_byte * 5470restgpr0 (bfd *abfd, bfd_byte *p, int r) 5471{ 5472 bfd_put_32 (abfd, LD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5473 return p + 4; 5474} 5475 5476static bfd_byte * 5477restgpr0_tail (bfd *abfd, bfd_byte *p, int r) 5478{ 5479 bfd_put_32 (abfd, LD_R0_0R1 + 16, p); 5480 p = p + 4; 5481 p = restgpr0 (abfd, p, r); 5482 bfd_put_32 (abfd, MTLR_R0, p); 5483 p = p + 4; 5484 if (r == 29) 5485 { 5486 p = restgpr0 (abfd, p, 30); 5487 p = restgpr0 (abfd, p, 31); 5488 } 5489 bfd_put_32 (abfd, BLR, p); 5490 return p + 4; 5491} 5492 5493static bfd_byte * 5494savegpr1 (bfd *abfd, bfd_byte *p, int r) 5495{ 5496 bfd_put_32 (abfd, STD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5497 return p + 4; 5498} 5499 5500static bfd_byte * 5501savegpr1_tail (bfd *abfd, bfd_byte *p, int r) 5502{ 5503 p = savegpr1 (abfd, p, r); 5504 bfd_put_32 (abfd, BLR, p); 5505 return p + 4; 5506} 5507 5508static bfd_byte * 5509restgpr1 (bfd *abfd, bfd_byte *p, int r) 5510{ 5511 bfd_put_32 (abfd, LD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5512 return p + 4; 5513} 5514 5515static bfd_byte * 5516restgpr1_tail (bfd *abfd, bfd_byte *p, int r) 5517{ 5518 p = restgpr1 (abfd, p, r); 5519 bfd_put_32 (abfd, BLR, p); 5520 return p + 4; 5521} 5522 5523static bfd_byte * 5524savefpr (bfd *abfd, bfd_byte *p, int r) 5525{ 5526 bfd_put_32 (abfd, STFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5527 return p + 4; 5528} 5529 5530static bfd_byte * 5531savefpr0_tail (bfd *abfd, bfd_byte *p, int r) 5532{ 5533 p = savefpr (abfd, p, r); 5534 bfd_put_32 (abfd, STD_R0_0R1 + 16, p); 5535 p = p + 4; 5536 bfd_put_32 (abfd, BLR, p); 5537 return p + 4; 5538} 5539 5540static bfd_byte * 5541restfpr (bfd *abfd, bfd_byte *p, int r) 5542{ 5543 bfd_put_32 (abfd, LFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5544 return p + 4; 5545} 5546 5547static bfd_byte * 5548restfpr0_tail (bfd *abfd, bfd_byte *p, int r) 5549{ 5550 bfd_put_32 (abfd, LD_R0_0R1 + 16, p); 5551 p = p + 4; 5552 p = restfpr (abfd, p, r); 5553 bfd_put_32 (abfd, MTLR_R0, p); 5554 p = p + 4; 5555 if (r == 29) 5556 { 5557 p = restfpr (abfd, p, 30); 5558 p = restfpr (abfd, p, 31); 5559 } 5560 bfd_put_32 (abfd, BLR, p); 5561 return p + 4; 5562} 5563 5564static bfd_byte * 5565savefpr1_tail (bfd *abfd, bfd_byte *p, int r) 5566{ 5567 p = savefpr (abfd, p, r); 5568 bfd_put_32 (abfd, BLR, p); 5569 return p + 4; 5570} 5571 5572static bfd_byte * 5573restfpr1_tail (bfd *abfd, bfd_byte *p, int r) 5574{ 5575 p = restfpr (abfd, p, r); 5576 bfd_put_32 (abfd, BLR, p); 5577 return p + 4; 5578} 5579 5580static bfd_byte * 5581savevr (bfd *abfd, bfd_byte *p, int r) 5582{ 5583 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p); 5584 p = p + 4; 5585 bfd_put_32 (abfd, STVX_VR0_R12_R0 + (r << 21), p); 5586 return p + 4; 5587} 5588 5589static bfd_byte * 5590savevr_tail (bfd *abfd, bfd_byte *p, int r) 5591{ 5592 p = savevr (abfd, p, r); 5593 bfd_put_32 (abfd, BLR, p); 5594 return p + 4; 5595} 5596 5597static bfd_byte * 5598restvr (bfd *abfd, bfd_byte *p, int r) 5599{ 5600 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p); 5601 p = p + 4; 5602 bfd_put_32 (abfd, LVX_VR0_R12_R0 + (r << 21), p); 5603 return p + 4; 5604} 5605 5606static bfd_byte * 5607restvr_tail (bfd *abfd, bfd_byte *p, int r) 5608{ 5609 p = restvr (abfd, p, r); 5610 bfd_put_32 (abfd, BLR, p); 5611 return p + 4; 5612} 5613 5614/* Called via elf_link_hash_traverse to transfer dynamic linking 5615 information on function code symbol entries to their corresponding 5616 function descriptor symbol entries. */ 5617 5618static bfd_boolean 5619func_desc_adjust (struct elf_link_hash_entry *h, void *inf) 5620{ 5621 struct bfd_link_info *info; 5622 struct ppc_link_hash_table *htab; 5623 struct plt_entry *ent; 5624 struct ppc_link_hash_entry *fh; 5625 struct ppc_link_hash_entry *fdh; 5626 bfd_boolean force_local; 5627 5628 fh = (struct ppc_link_hash_entry *) h; 5629 if (fh->elf.root.type == bfd_link_hash_indirect) 5630 return TRUE; 5631 5632 if (fh->elf.root.type == bfd_link_hash_warning) 5633 fh = (struct ppc_link_hash_entry *) fh->elf.root.u.i.link; 5634 5635 info = inf; 5636 htab = ppc_hash_table (info); 5637 5638 /* Resolve undefined references to dot-symbols as the value 5639 in the function descriptor, if we have one in a regular object. 5640 This is to satisfy cases like ".quad .foo". Calls to functions 5641 in dynamic objects are handled elsewhere. */ 5642 if (fh->elf.root.type == bfd_link_hash_undefweak 5643 && fh->was_undefined 5644 && (fh->oh->elf.root.type == bfd_link_hash_defined 5645 || fh->oh->elf.root.type == bfd_link_hash_defweak) 5646 && get_opd_info (fh->oh->elf.root.u.def.section) != NULL 5647 && opd_entry_value (fh->oh->elf.root.u.def.section, 5648 fh->oh->elf.root.u.def.value, 5649 &fh->elf.root.u.def.section, 5650 &fh->elf.root.u.def.value) != (bfd_vma) -1) 5651 { 5652 fh->elf.root.type = fh->oh->elf.root.type; 5653 fh->elf.forced_local = 1; 5654 } 5655 5656 /* If this is a function code symbol, transfer dynamic linking 5657 information to the function descriptor symbol. */ 5658 if (!fh->is_func) 5659 return TRUE; 5660 5661 for (ent = fh->elf.plt.plist; ent != NULL; ent = ent->next) 5662 if (ent->plt.refcount > 0) 5663 break; 5664 if (ent == NULL 5665 || fh->elf.root.root.string[0] != '.' 5666 || fh->elf.root.root.string[1] == '\0') 5667 return TRUE; 5668 5669 /* Find the corresponding function descriptor symbol. Create it 5670 as undefined if necessary. */ 5671 5672 fdh = get_fdh (fh, htab); 5673 if (fdh != NULL) 5674 while (fdh->elf.root.type == bfd_link_hash_indirect 5675 || fdh->elf.root.type == bfd_link_hash_warning) 5676 fdh = (struct ppc_link_hash_entry *) fdh->elf.root.u.i.link; 5677 5678 if (fdh == NULL 5679 && info->shared 5680 && (fh->elf.root.type == bfd_link_hash_undefined 5681 || fh->elf.root.type == bfd_link_hash_undefweak)) 5682 { 5683 fdh = make_fdh (info, fh); 5684 if (fdh == NULL) 5685 return FALSE; 5686 } 5687 5688 /* Fake function descriptors are made undefweak. If the function 5689 code symbol is strong undefined, make the fake sym the same. 5690 If the function code symbol is defined, then force the fake 5691 descriptor local; We can't support overriding of symbols in a 5692 shared library on a fake descriptor. */ 5693 5694 if (fdh != NULL 5695 && fdh->fake 5696 && fdh->elf.root.type == bfd_link_hash_undefweak) 5697 { 5698 if (fh->elf.root.type == bfd_link_hash_undefined) 5699 { 5700 fdh->elf.root.type = bfd_link_hash_undefined; 5701 bfd_link_add_undef (&htab->elf.root, &fdh->elf.root); 5702 } 5703 else if (fh->elf.root.type == bfd_link_hash_defined 5704 || fh->elf.root.type == bfd_link_hash_defweak) 5705 { 5706 _bfd_elf_link_hash_hide_symbol (info, &fdh->elf, TRUE); 5707 } 5708 } 5709 5710 if (fdh != NULL 5711 && !fdh->elf.forced_local 5712 && (info->shared 5713 || fdh->elf.def_dynamic 5714 || fdh->elf.ref_dynamic 5715 || (fdh->elf.root.type == bfd_link_hash_undefweak 5716 && ELF_ST_VISIBILITY (fdh->elf.other) == STV_DEFAULT))) 5717 { 5718 if (fdh->elf.dynindx == -1) 5719 if (! bfd_elf_link_record_dynamic_symbol (info, &fdh->elf)) 5720 return FALSE; 5721 fdh->elf.ref_regular |= fh->elf.ref_regular; 5722 fdh->elf.ref_dynamic |= fh->elf.ref_dynamic; 5723 fdh->elf.ref_regular_nonweak |= fh->elf.ref_regular_nonweak; 5724 fdh->elf.non_got_ref |= fh->elf.non_got_ref; 5725 if (ELF_ST_VISIBILITY (fh->elf.other) == STV_DEFAULT) 5726 { 5727 move_plt_plist (fh, fdh); 5728 fdh->elf.needs_plt = 1; 5729 } 5730 fdh->is_func_descriptor = 1; 5731 fdh->oh = fh; 5732 fh->oh = fdh; 5733 } 5734 5735 /* Now that the info is on the function descriptor, clear the 5736 function code sym info. Any function code syms for which we 5737 don't have a definition in a regular file, we force local. 5738 This prevents a shared library from exporting syms that have 5739 been imported from another library. Function code syms that 5740 are really in the library we must leave global to prevent the 5741 linker dragging in a definition from a static library. */ 5742 force_local = (!fh->elf.def_regular 5743 || fdh == NULL 5744 || !fdh->elf.def_regular 5745 || fdh->elf.forced_local); 5746 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local); 5747 5748 return TRUE; 5749} 5750 5751/* Called near the start of bfd_elf_size_dynamic_sections. We use 5752 this hook to a) provide some gcc support functions, and b) transfer 5753 dynamic linking information gathered so far on function code symbol 5754 entries, to their corresponding function descriptor symbol entries. */ 5755 5756static bfd_boolean 5757ppc64_elf_func_desc_adjust (bfd *obfd ATTRIBUTE_UNUSED, 5758 struct bfd_link_info *info) 5759{ 5760 struct ppc_link_hash_table *htab; 5761 unsigned int i; 5762 const struct sfpr_def_parms funcs[] = 5763 { 5764 { "_savegpr0_", 14, 31, savegpr0, savegpr0_tail }, 5765 { "_restgpr0_", 14, 29, restgpr0, restgpr0_tail }, 5766 { "_restgpr0_", 30, 31, restgpr0, restgpr0_tail }, 5767 { "_savegpr1_", 14, 31, savegpr1, savegpr1_tail }, 5768 { "_restgpr1_", 14, 31, restgpr1, restgpr1_tail }, 5769 { "_savefpr_", 14, 31, savefpr, savefpr0_tail }, 5770 { "_restfpr_", 14, 29, restfpr, restfpr0_tail }, 5771 { "_restfpr_", 30, 31, restfpr, restfpr0_tail }, 5772 { "._savef", 14, 31, savefpr, savefpr1_tail }, 5773 { "._restf", 14, 31, restfpr, restfpr1_tail }, 5774 { "_savevr_", 20, 31, savevr, savevr_tail }, 5775 { "_restvr_", 20, 31, restvr, restvr_tail } 5776 }; 5777 5778 htab = ppc_hash_table (info); 5779 if (htab->sfpr == NULL) 5780 /* We don't have any relocs. */ 5781 return TRUE; 5782 5783 /* Provide any missing _save* and _rest* functions. */ 5784 htab->sfpr->size = 0; 5785 for (i = 0; i < sizeof (funcs) / sizeof (funcs[0]); i++) 5786 if (!sfpr_define (info, &funcs[i])) 5787 return FALSE; 5788 5789 elf_link_hash_traverse (&htab->elf, func_desc_adjust, info); 5790 5791 if (htab->sfpr->size == 0) 5792 htab->sfpr->flags |= SEC_EXCLUDE; 5793 5794 return TRUE; 5795} 5796 5797/* Adjust a symbol defined by a dynamic object and referenced by a 5798 regular object. The current definition is in some section of the 5799 dynamic object, but we're not including those sections. We have to 5800 change the definition to something the rest of the link can 5801 understand. */ 5802 5803static bfd_boolean 5804ppc64_elf_adjust_dynamic_symbol (struct bfd_link_info *info, 5805 struct elf_link_hash_entry *h) 5806{ 5807 struct ppc_link_hash_table *htab; 5808 asection *s; 5809 5810 htab = ppc_hash_table (info); 5811 5812 /* Deal with function syms. */ 5813 if (h->type == STT_FUNC 5814 || h->needs_plt) 5815 { 5816 /* Clear procedure linkage table information for any symbol that 5817 won't need a .plt entry. */ 5818 struct plt_entry *ent; 5819 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 5820 if (ent->plt.refcount > 0) 5821 break; 5822 if (ent == NULL 5823 || SYMBOL_CALLS_LOCAL (info, h) 5824 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 5825 && h->root.type == bfd_link_hash_undefweak)) 5826 { 5827 h->plt.plist = NULL; 5828 h->needs_plt = 0; 5829 } 5830 } 5831 else 5832 h->plt.plist = NULL; 5833 5834 /* If this is a weak symbol, and there is a real definition, the 5835 processor independent code will have arranged for us to see the 5836 real definition first, and we can just use the same value. */ 5837 if (h->u.weakdef != NULL) 5838 { 5839 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 5840 || h->u.weakdef->root.type == bfd_link_hash_defweak); 5841 h->root.u.def.section = h->u.weakdef->root.u.def.section; 5842 h->root.u.def.value = h->u.weakdef->root.u.def.value; 5843 if (ELIMINATE_COPY_RELOCS) 5844 h->non_got_ref = h->u.weakdef->non_got_ref; 5845 return TRUE; 5846 } 5847 5848 /* If we are creating a shared library, we must presume that the 5849 only references to the symbol are via the global offset table. 5850 For such cases we need not do anything here; the relocations will 5851 be handled correctly by relocate_section. */ 5852 if (info->shared) 5853 return TRUE; 5854 5855 /* If there are no references to this symbol that do not use the 5856 GOT, we don't need to generate a copy reloc. */ 5857 if (!h->non_got_ref) 5858 return TRUE; 5859 5860 /* Don't generate a copy reloc for symbols defined in the executable. */ 5861 if (!h->def_dynamic || !h->ref_regular || h->def_regular) 5862 return TRUE; 5863 5864 if (ELIMINATE_COPY_RELOCS) 5865 { 5866 struct ppc_link_hash_entry * eh; 5867 struct ppc_dyn_relocs *p; 5868 5869 eh = (struct ppc_link_hash_entry *) h; 5870 for (p = eh->dyn_relocs; p != NULL; p = p->next) 5871 { 5872 s = p->sec->output_section; 5873 if (s != NULL && (s->flags & SEC_READONLY) != 0) 5874 break; 5875 } 5876 5877 /* If we didn't find any dynamic relocs in read-only sections, then 5878 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 5879 if (p == NULL) 5880 { 5881 h->non_got_ref = 0; 5882 return TRUE; 5883 } 5884 } 5885 5886 if (h->plt.plist != NULL) 5887 { 5888 /* We should never get here, but unfortunately there are versions 5889 of gcc out there that improperly (for this ABI) put initialized 5890 function pointers, vtable refs and suchlike in read-only 5891 sections. Allow them to proceed, but warn that this might 5892 break at runtime. */ 5893 (*_bfd_error_handler) 5894 (_("copy reloc against `%s' requires lazy plt linking; " 5895 "avoid setting LD_BIND_NOW=1 or upgrade gcc"), 5896 h->root.root.string); 5897 } 5898 5899 /* This is a reference to a symbol defined by a dynamic object which 5900 is not a function. */ 5901 5902 if (h->size == 0) 5903 { 5904 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 5905 h->root.root.string); 5906 return TRUE; 5907 } 5908 5909 /* We must allocate the symbol in our .dynbss section, which will 5910 become part of the .bss section of the executable. There will be 5911 an entry for this symbol in the .dynsym section. The dynamic 5912 object will contain position independent code, so all references 5913 from the dynamic object to this symbol will go through the global 5914 offset table. The dynamic linker will use the .dynsym entry to 5915 determine the address it must put in the global offset table, so 5916 both the dynamic object and the regular object will refer to the 5917 same memory location for the variable. */ 5918 5919 /* We must generate a R_PPC64_COPY reloc to tell the dynamic linker 5920 to copy the initial value out of the dynamic object and into the 5921 runtime process image. We need to remember the offset into the 5922 .rela.bss section we are going to use. */ 5923 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 5924 { 5925 htab->relbss->size += sizeof (Elf64_External_Rela); 5926 h->needs_copy = 1; 5927 } 5928 5929 s = htab->dynbss; 5930 5931 return _bfd_elf_adjust_dynamic_copy (h, s); 5932} 5933 5934/* If given a function descriptor symbol, hide both the function code 5935 sym and the descriptor. */ 5936static void 5937ppc64_elf_hide_symbol (struct bfd_link_info *info, 5938 struct elf_link_hash_entry *h, 5939 bfd_boolean force_local) 5940{ 5941 struct ppc_link_hash_entry *eh; 5942 _bfd_elf_link_hash_hide_symbol (info, h, force_local); 5943 5944 eh = (struct ppc_link_hash_entry *) h; 5945 if (eh->is_func_descriptor) 5946 { 5947 struct ppc_link_hash_entry *fh = eh->oh; 5948 5949 if (fh == NULL) 5950 { 5951 const char *p, *q; 5952 struct ppc_link_hash_table *htab; 5953 char save; 5954 5955 /* We aren't supposed to use alloca in BFD because on 5956 systems which do not have alloca the version in libiberty 5957 calls xmalloc, which might cause the program to crash 5958 when it runs out of memory. This function doesn't have a 5959 return status, so there's no way to gracefully return an 5960 error. So cheat. We know that string[-1] can be safely 5961 accessed; It's either a string in an ELF string table, 5962 or allocated in an objalloc structure. */ 5963 5964 p = eh->elf.root.root.string - 1; 5965 save = *p; 5966 *(char *) p = '.'; 5967 htab = ppc_hash_table (info); 5968 fh = (struct ppc_link_hash_entry *) 5969 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE); 5970 *(char *) p = save; 5971 5972 /* Unfortunately, if it so happens that the string we were 5973 looking for was allocated immediately before this string, 5974 then we overwrote the string terminator. That's the only 5975 reason the lookup should fail. */ 5976 if (fh == NULL) 5977 { 5978 q = eh->elf.root.root.string + strlen (eh->elf.root.root.string); 5979 while (q >= eh->elf.root.root.string && *q == *p) 5980 --q, --p; 5981 if (q < eh->elf.root.root.string && *p == '.') 5982 fh = (struct ppc_link_hash_entry *) 5983 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE); 5984 } 5985 if (fh != NULL) 5986 { 5987 eh->oh = fh; 5988 fh->oh = eh; 5989 } 5990 } 5991 if (fh != NULL) 5992 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local); 5993 } 5994} 5995 5996static bfd_boolean 5997get_sym_h (struct elf_link_hash_entry **hp, 5998 Elf_Internal_Sym **symp, 5999 asection **symsecp, 6000 char **tls_maskp, 6001 Elf_Internal_Sym **locsymsp, 6002 unsigned long r_symndx, 6003 bfd *ibfd) 6004{ 6005 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 6006 6007 if (r_symndx >= symtab_hdr->sh_info) 6008 { 6009 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd); 6010 struct elf_link_hash_entry *h; 6011 6012 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 6013 while (h->root.type == bfd_link_hash_indirect 6014 || h->root.type == bfd_link_hash_warning) 6015 h = (struct elf_link_hash_entry *) h->root.u.i.link; 6016 6017 if (hp != NULL) 6018 *hp = h; 6019 6020 if (symp != NULL) 6021 *symp = NULL; 6022 6023 if (symsecp != NULL) 6024 { 6025 asection *symsec = NULL; 6026 if (h->root.type == bfd_link_hash_defined 6027 || h->root.type == bfd_link_hash_defweak) 6028 symsec = h->root.u.def.section; 6029 *symsecp = symsec; 6030 } 6031 6032 if (tls_maskp != NULL) 6033 { 6034 struct ppc_link_hash_entry *eh; 6035 6036 eh = (struct ppc_link_hash_entry *) h; 6037 *tls_maskp = &eh->tls_mask; 6038 } 6039 } 6040 else 6041 { 6042 Elf_Internal_Sym *sym; 6043 Elf_Internal_Sym *locsyms = *locsymsp; 6044 6045 if (locsyms == NULL) 6046 { 6047 locsyms = (Elf_Internal_Sym *) symtab_hdr->contents; 6048 if (locsyms == NULL) 6049 locsyms = bfd_elf_get_elf_syms (ibfd, symtab_hdr, 6050 symtab_hdr->sh_info, 6051 0, NULL, NULL, NULL); 6052 if (locsyms == NULL) 6053 return FALSE; 6054 *locsymsp = locsyms; 6055 } 6056 sym = locsyms + r_symndx; 6057 6058 if (hp != NULL) 6059 *hp = NULL; 6060 6061 if (symp != NULL) 6062 *symp = sym; 6063 6064 if (symsecp != NULL) 6065 { 6066 asection *symsec = NULL; 6067 if ((sym->st_shndx != SHN_UNDEF 6068 && sym->st_shndx < SHN_LORESERVE) 6069 || sym->st_shndx > SHN_HIRESERVE) 6070 symsec = bfd_section_from_elf_index (ibfd, sym->st_shndx); 6071 *symsecp = symsec; 6072 } 6073 6074 if (tls_maskp != NULL) 6075 { 6076 struct got_entry **lgot_ents; 6077 char *tls_mask; 6078 6079 tls_mask = NULL; 6080 lgot_ents = elf_local_got_ents (ibfd); 6081 if (lgot_ents != NULL) 6082 { 6083 char *lgot_masks = (char *) (lgot_ents + symtab_hdr->sh_info); 6084 tls_mask = &lgot_masks[r_symndx]; 6085 } 6086 *tls_maskp = tls_mask; 6087 } 6088 } 6089 return TRUE; 6090} 6091 6092/* Returns TLS_MASKP for the given REL symbol. Function return is 0 on 6093 error, 2 on a toc GD type suitable for optimization, 3 on a toc LD 6094 type suitable for optimization, and 1 otherwise. */ 6095 6096static int 6097get_tls_mask (char **tls_maskp, unsigned long *toc_symndx, 6098 Elf_Internal_Sym **locsymsp, 6099 const Elf_Internal_Rela *rel, bfd *ibfd) 6100{ 6101 unsigned long r_symndx; 6102 int next_r; 6103 struct elf_link_hash_entry *h; 6104 Elf_Internal_Sym *sym; 6105 asection *sec; 6106 bfd_vma off; 6107 6108 r_symndx = ELF64_R_SYM (rel->r_info); 6109 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd)) 6110 return 0; 6111 6112 if ((*tls_maskp != NULL && **tls_maskp != 0) 6113 || sec == NULL 6114 || ppc64_elf_section_data (sec)->sec_type != sec_toc) 6115 return 1; 6116 6117 /* Look inside a TOC section too. */ 6118 if (h != NULL) 6119 { 6120 BFD_ASSERT (h->root.type == bfd_link_hash_defined); 6121 off = h->root.u.def.value; 6122 } 6123 else 6124 off = sym->st_value; 6125 off += rel->r_addend; 6126 BFD_ASSERT (off % 8 == 0); 6127 r_symndx = ppc64_elf_section_data (sec)->u.t_symndx[off / 8]; 6128 next_r = ppc64_elf_section_data (sec)->u.t_symndx[off / 8 + 1]; 6129 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd)) 6130 return 0; 6131 if (toc_symndx != NULL) 6132 *toc_symndx = r_symndx; 6133 if ((h == NULL 6134 || ((h->root.type == bfd_link_hash_defined 6135 || h->root.type == bfd_link_hash_defweak) 6136 && !h->def_dynamic)) 6137 && (next_r == -1 || next_r == -2)) 6138 return 1 - next_r; 6139 return 1; 6140} 6141 6142/* Adjust all global syms defined in opd sections. In gcc generated 6143 code for the old ABI, these will already have been done. */ 6144 6145static bfd_boolean 6146adjust_opd_syms (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED) 6147{ 6148 struct ppc_link_hash_entry *eh; 6149 asection *sym_sec; 6150 long *opd_adjust; 6151 6152 if (h->root.type == bfd_link_hash_indirect) 6153 return TRUE; 6154 6155 if (h->root.type == bfd_link_hash_warning) 6156 h = (struct elf_link_hash_entry *) h->root.u.i.link; 6157 6158 if (h->root.type != bfd_link_hash_defined 6159 && h->root.type != bfd_link_hash_defweak) 6160 return TRUE; 6161 6162 eh = (struct ppc_link_hash_entry *) h; 6163 if (eh->adjust_done) 6164 return TRUE; 6165 6166 sym_sec = eh->elf.root.u.def.section; 6167 opd_adjust = get_opd_info (sym_sec); 6168 if (opd_adjust != NULL) 6169 { 6170 long adjust = opd_adjust[eh->elf.root.u.def.value / 8]; 6171 if (adjust == -1) 6172 { 6173 /* This entry has been deleted. */ 6174 asection *dsec = ppc64_elf_tdata (sym_sec->owner)->deleted_section; 6175 if (dsec == NULL) 6176 { 6177 for (dsec = sym_sec->owner->sections; dsec; dsec = dsec->next) 6178 if (elf_discarded_section (dsec)) 6179 { 6180 ppc64_elf_tdata (sym_sec->owner)->deleted_section = dsec; 6181 break; 6182 } 6183 } 6184 eh->elf.root.u.def.value = 0; 6185 eh->elf.root.u.def.section = dsec; 6186 } 6187 else 6188 eh->elf.root.u.def.value += adjust; 6189 eh->adjust_done = 1; 6190 } 6191 return TRUE; 6192} 6193 6194/* Handles decrementing dynamic reloc counts for the reloc specified by 6195 R_INFO in section SEC. If LOCAL_SYMS is NULL, then H and SYM_SEC 6196 have already been determined. */ 6197 6198static bfd_boolean 6199dec_dynrel_count (bfd_vma r_info, 6200 asection *sec, 6201 struct bfd_link_info *info, 6202 Elf_Internal_Sym **local_syms, 6203 struct elf_link_hash_entry *h, 6204 asection *sym_sec) 6205{ 6206 enum elf_ppc64_reloc_type r_type; 6207 struct ppc_dyn_relocs *p; 6208 struct ppc_dyn_relocs **pp; 6209 6210 /* Can this reloc be dynamic? This switch, and later tests here 6211 should be kept in sync with the code in check_relocs. */ 6212 r_type = ELF64_R_TYPE (r_info); 6213 switch (r_type) 6214 { 6215 default: 6216 return TRUE; 6217 6218 case R_PPC64_TPREL16: 6219 case R_PPC64_TPREL16_LO: 6220 case R_PPC64_TPREL16_HI: 6221 case R_PPC64_TPREL16_HA: 6222 case R_PPC64_TPREL16_DS: 6223 case R_PPC64_TPREL16_LO_DS: 6224 case R_PPC64_TPREL16_HIGHER: 6225 case R_PPC64_TPREL16_HIGHERA: 6226 case R_PPC64_TPREL16_HIGHEST: 6227 case R_PPC64_TPREL16_HIGHESTA: 6228 if (!info->shared) 6229 return TRUE; 6230 6231 case R_PPC64_TPREL64: 6232 case R_PPC64_DTPMOD64: 6233 case R_PPC64_DTPREL64: 6234 case R_PPC64_ADDR64: 6235 case R_PPC64_REL30: 6236 case R_PPC64_REL32: 6237 case R_PPC64_REL64: 6238 case R_PPC64_ADDR14: 6239 case R_PPC64_ADDR14_BRNTAKEN: 6240 case R_PPC64_ADDR14_BRTAKEN: 6241 case R_PPC64_ADDR16: 6242 case R_PPC64_ADDR16_DS: 6243 case R_PPC64_ADDR16_HA: 6244 case R_PPC64_ADDR16_HI: 6245 case R_PPC64_ADDR16_HIGHER: 6246 case R_PPC64_ADDR16_HIGHERA: 6247 case R_PPC64_ADDR16_HIGHEST: 6248 case R_PPC64_ADDR16_HIGHESTA: 6249 case R_PPC64_ADDR16_LO: 6250 case R_PPC64_ADDR16_LO_DS: 6251 case R_PPC64_ADDR24: 6252 case R_PPC64_ADDR32: 6253 case R_PPC64_UADDR16: 6254 case R_PPC64_UADDR32: 6255 case R_PPC64_UADDR64: 6256 case R_PPC64_TOC: 6257 break; 6258 } 6259 6260 if (local_syms != NULL) 6261 { 6262 unsigned long r_symndx; 6263 Elf_Internal_Sym *sym; 6264 bfd *ibfd = sec->owner; 6265 6266 r_symndx = ELF64_R_SYM (r_info); 6267 if (!get_sym_h (&h, &sym, &sym_sec, NULL, local_syms, r_symndx, ibfd)) 6268 return FALSE; 6269 } 6270 6271 if ((info->shared 6272 && (MUST_BE_DYN_RELOC (r_type) 6273 || (h != NULL 6274 && (!info->symbolic 6275 || h->root.type == bfd_link_hash_defweak 6276 || !h->def_regular)))) 6277 || (ELIMINATE_COPY_RELOCS 6278 && !info->shared 6279 && h != NULL 6280 && (h->root.type == bfd_link_hash_defweak 6281 || !h->def_regular))) 6282 ; 6283 else 6284 return TRUE; 6285 6286 if (h != NULL) 6287 pp = &((struct ppc_link_hash_entry *) h)->dyn_relocs; 6288 else 6289 { 6290 if (sym_sec != NULL) 6291 { 6292 void *vpp = &elf_section_data (sym_sec)->local_dynrel; 6293 pp = (struct ppc_dyn_relocs **) vpp; 6294 } 6295 else 6296 { 6297 void *vpp = &elf_section_data (sec)->local_dynrel; 6298 pp = (struct ppc_dyn_relocs **) vpp; 6299 } 6300 6301 /* elf_gc_sweep may have already removed all dyn relocs associated 6302 with local syms for a given section. Don't report a dynreloc 6303 miscount. */ 6304 if (*pp == NULL) 6305 return TRUE; 6306 } 6307 6308 while ((p = *pp) != NULL) 6309 { 6310 if (p->sec == sec) 6311 { 6312 if (!MUST_BE_DYN_RELOC (r_type)) 6313 p->pc_count -= 1; 6314 p->count -= 1; 6315 if (p->count == 0) 6316 *pp = p->next; 6317 return TRUE; 6318 } 6319 pp = &p->next; 6320 } 6321 6322 (*_bfd_error_handler) (_("dynreloc miscount for %B, section %A"), 6323 sec->owner, sec); 6324 bfd_set_error (bfd_error_bad_value); 6325 return FALSE; 6326} 6327 6328/* Remove unused Official Procedure Descriptor entries. Currently we 6329 only remove those associated with functions in discarded link-once 6330 sections, or weakly defined functions that have been overridden. It 6331 would be possible to remove many more entries for statically linked 6332 applications. */ 6333 6334bfd_boolean 6335ppc64_elf_edit_opd (bfd *obfd, struct bfd_link_info *info, 6336 bfd_boolean no_opd_opt, 6337 bfd_boolean non_overlapping) 6338{ 6339 bfd *ibfd; 6340 bfd_boolean some_edited = FALSE; 6341 asection *need_pad = NULL; 6342 6343 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 6344 { 6345 asection *sec; 6346 Elf_Internal_Rela *relstart, *rel, *relend; 6347 Elf_Internal_Shdr *symtab_hdr; 6348 Elf_Internal_Sym *local_syms; 6349 struct elf_link_hash_entry **sym_hashes; 6350 bfd_vma offset; 6351 bfd_size_type amt; 6352 long *opd_adjust; 6353 bfd_boolean need_edit, add_aux_fields; 6354 bfd_size_type cnt_16b = 0; 6355 6356 sec = bfd_get_section_by_name (ibfd, ".opd"); 6357 if (sec == NULL || sec->size == 0) 6358 continue; 6359 6360 amt = sec->size * sizeof (long) / 8; 6361 opd_adjust = get_opd_info (sec); 6362 if (opd_adjust == NULL) 6363 { 6364 /* check_relocs hasn't been called. Must be a ld -r link 6365 or --just-symbols object. */ 6366 opd_adjust = bfd_alloc (obfd, amt); 6367 if (opd_adjust == NULL) 6368 return FALSE; 6369 ppc64_elf_section_data (sec)->u.opd_adjust = opd_adjust; 6370 BFD_ASSERT (ppc64_elf_section_data (sec)->sec_type == sec_normal); 6371 ppc64_elf_section_data (sec)->sec_type = sec_opd; 6372 } 6373 memset (opd_adjust, 0, amt); 6374 6375 if (no_opd_opt) 6376 continue; 6377 6378 if (sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS) 6379 continue; 6380 6381 if (sec->output_section == bfd_abs_section_ptr) 6382 continue; 6383 6384 /* Look through the section relocs. */ 6385 if ((sec->flags & SEC_RELOC) == 0 || sec->reloc_count == 0) 6386 continue; 6387 6388 local_syms = NULL; 6389 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 6390 sym_hashes = elf_sym_hashes (ibfd); 6391 6392 /* Read the relocations. */ 6393 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 6394 info->keep_memory); 6395 if (relstart == NULL) 6396 return FALSE; 6397 6398 /* First run through the relocs to check they are sane, and to 6399 determine whether we need to edit this opd section. */ 6400 need_edit = FALSE; 6401 need_pad = sec; 6402 offset = 0; 6403 relend = relstart + sec->reloc_count; 6404 for (rel = relstart; rel < relend; ) 6405 { 6406 enum elf_ppc64_reloc_type r_type; 6407 unsigned long r_symndx; 6408 asection *sym_sec; 6409 struct elf_link_hash_entry *h; 6410 Elf_Internal_Sym *sym; 6411 6412 /* .opd contains a regular array of 16 or 24 byte entries. We're 6413 only interested in the reloc pointing to a function entry 6414 point. */ 6415 if (rel->r_offset != offset 6416 || rel + 1 >= relend 6417 || (rel + 1)->r_offset != offset + 8) 6418 { 6419 /* If someone messes with .opd alignment then after a 6420 "ld -r" we might have padding in the middle of .opd. 6421 Also, there's nothing to prevent someone putting 6422 something silly in .opd with the assembler. No .opd 6423 optimization for them! */ 6424 broken_opd: 6425 (*_bfd_error_handler) 6426 (_("%B: .opd is not a regular array of opd entries"), ibfd); 6427 need_edit = FALSE; 6428 break; 6429 } 6430 6431 if ((r_type = ELF64_R_TYPE (rel->r_info)) != R_PPC64_ADDR64 6432 || (r_type = ELF64_R_TYPE ((rel + 1)->r_info)) != R_PPC64_TOC) 6433 { 6434 (*_bfd_error_handler) 6435 (_("%B: unexpected reloc type %u in .opd section"), 6436 ibfd, r_type); 6437 need_edit = FALSE; 6438 break; 6439 } 6440 6441 r_symndx = ELF64_R_SYM (rel->r_info); 6442 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 6443 r_symndx, ibfd)) 6444 goto error_ret; 6445 6446 if (sym_sec == NULL || sym_sec->owner == NULL) 6447 { 6448 const char *sym_name; 6449 if (h != NULL) 6450 sym_name = h->root.root.string; 6451 else 6452 sym_name = bfd_elf_sym_name (ibfd, symtab_hdr, sym, 6453 sym_sec); 6454 6455 (*_bfd_error_handler) 6456 (_("%B: undefined sym `%s' in .opd section"), 6457 ibfd, sym_name); 6458 need_edit = FALSE; 6459 break; 6460 } 6461 6462 /* opd entries are always for functions defined in the 6463 current input bfd. If the symbol isn't defined in the 6464 input bfd, then we won't be using the function in this 6465 bfd; It must be defined in a linkonce section in another 6466 bfd, or is weak. It's also possible that we are 6467 discarding the function due to a linker script /DISCARD/, 6468 which we test for via the output_section. */ 6469 if (sym_sec->owner != ibfd 6470 || sym_sec->output_section == bfd_abs_section_ptr) 6471 need_edit = TRUE; 6472 6473 rel += 2; 6474 if (rel == relend 6475 || (rel + 1 == relend && rel->r_offset == offset + 16)) 6476 { 6477 if (sec->size == offset + 24) 6478 { 6479 need_pad = NULL; 6480 break; 6481 } 6482 if (rel == relend && sec->size == offset + 16) 6483 { 6484 cnt_16b++; 6485 break; 6486 } 6487 goto broken_opd; 6488 } 6489 6490 if (rel->r_offset == offset + 24) 6491 offset += 24; 6492 else if (rel->r_offset != offset + 16) 6493 goto broken_opd; 6494 else if (rel + 1 < relend 6495 && ELF64_R_TYPE (rel[0].r_info) == R_PPC64_ADDR64 6496 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_TOC) 6497 { 6498 offset += 16; 6499 cnt_16b++; 6500 } 6501 else if (rel + 2 < relend 6502 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_ADDR64 6503 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_TOC) 6504 { 6505 offset += 24; 6506 rel += 1; 6507 } 6508 else 6509 goto broken_opd; 6510 } 6511 6512 add_aux_fields = non_overlapping && cnt_16b > 0; 6513 6514 if (need_edit || add_aux_fields) 6515 { 6516 Elf_Internal_Rela *write_rel; 6517 bfd_byte *rptr, *wptr; 6518 bfd_byte *new_contents = NULL; 6519 bfd_boolean skip; 6520 long opd_ent_size; 6521 6522 /* This seems a waste of time as input .opd sections are all 6523 zeros as generated by gcc, but I suppose there's no reason 6524 this will always be so. We might start putting something in 6525 the third word of .opd entries. */ 6526 if ((sec->flags & SEC_IN_MEMORY) == 0) 6527 { 6528 bfd_byte *loc; 6529 if (!bfd_malloc_and_get_section (ibfd, sec, &loc)) 6530 { 6531 if (loc != NULL) 6532 free (loc); 6533 error_ret: 6534 if (local_syms != NULL 6535 && symtab_hdr->contents != (unsigned char *) local_syms) 6536 free (local_syms); 6537 if (elf_section_data (sec)->relocs != relstart) 6538 free (relstart); 6539 return FALSE; 6540 } 6541 sec->contents = loc; 6542 sec->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS); 6543 } 6544 6545 elf_section_data (sec)->relocs = relstart; 6546 6547 new_contents = sec->contents; 6548 if (add_aux_fields) 6549 { 6550 new_contents = bfd_malloc (sec->size + cnt_16b * 8); 6551 if (new_contents == NULL) 6552 return FALSE; 6553 need_pad = FALSE; 6554 } 6555 wptr = new_contents; 6556 rptr = sec->contents; 6557 6558 write_rel = relstart; 6559 skip = FALSE; 6560 offset = 0; 6561 opd_ent_size = 0; 6562 for (rel = relstart; rel < relend; rel++) 6563 { 6564 unsigned long r_symndx; 6565 asection *sym_sec; 6566 struct elf_link_hash_entry *h; 6567 Elf_Internal_Sym *sym; 6568 6569 r_symndx = ELF64_R_SYM (rel->r_info); 6570 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 6571 r_symndx, ibfd)) 6572 goto error_ret; 6573 6574 if (rel->r_offset == offset) 6575 { 6576 struct ppc_link_hash_entry *fdh = NULL; 6577 6578 /* See if the .opd entry is full 24 byte or 6579 16 byte (with fd_aux entry overlapped with next 6580 fd_func). */ 6581 opd_ent_size = 24; 6582 if ((rel + 2 == relend && sec->size == offset + 16) 6583 || (rel + 3 < relend 6584 && rel[2].r_offset == offset + 16 6585 && rel[3].r_offset == offset + 24 6586 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_ADDR64 6587 && ELF64_R_TYPE (rel[3].r_info) == R_PPC64_TOC)) 6588 opd_ent_size = 16; 6589 6590 if (h != NULL 6591 && h->root.root.string[0] == '.') 6592 { 6593 fdh = get_fdh ((struct ppc_link_hash_entry *) h, 6594 ppc_hash_table (info)); 6595 if (fdh != NULL 6596 && fdh->elf.root.type != bfd_link_hash_defined 6597 && fdh->elf.root.type != bfd_link_hash_defweak) 6598 fdh = NULL; 6599 } 6600 6601 skip = (sym_sec->owner != ibfd 6602 || sym_sec->output_section == bfd_abs_section_ptr); 6603 if (skip) 6604 { 6605 if (fdh != NULL && sym_sec->owner == ibfd) 6606 { 6607 /* Arrange for the function descriptor sym 6608 to be dropped. */ 6609 fdh->elf.root.u.def.value = 0; 6610 fdh->elf.root.u.def.section = sym_sec; 6611 } 6612 opd_adjust[rel->r_offset / 8] = -1; 6613 } 6614 else 6615 { 6616 /* We'll be keeping this opd entry. */ 6617 6618 if (fdh != NULL) 6619 { 6620 /* Redefine the function descriptor symbol to 6621 this location in the opd section. It is 6622 necessary to update the value here rather 6623 than using an array of adjustments as we do 6624 for local symbols, because various places 6625 in the generic ELF code use the value 6626 stored in u.def.value. */ 6627 fdh->elf.root.u.def.value = wptr - new_contents; 6628 fdh->adjust_done = 1; 6629 } 6630 6631 /* Local syms are a bit tricky. We could 6632 tweak them as they can be cached, but 6633 we'd need to look through the local syms 6634 for the function descriptor sym which we 6635 don't have at the moment. So keep an 6636 array of adjustments. */ 6637 opd_adjust[rel->r_offset / 8] 6638 = (wptr - new_contents) - (rptr - sec->contents); 6639 6640 if (wptr != rptr) 6641 memcpy (wptr, rptr, opd_ent_size); 6642 wptr += opd_ent_size; 6643 if (add_aux_fields && opd_ent_size == 16) 6644 { 6645 memset (wptr, '\0', 8); 6646 wptr += 8; 6647 } 6648 } 6649 rptr += opd_ent_size; 6650 offset += opd_ent_size; 6651 } 6652 6653 if (skip) 6654 { 6655 if (!NO_OPD_RELOCS 6656 && !info->relocatable 6657 && !dec_dynrel_count (rel->r_info, sec, info, 6658 NULL, h, sym_sec)) 6659 goto error_ret; 6660 } 6661 else 6662 { 6663 /* We need to adjust any reloc offsets to point to the 6664 new opd entries. While we're at it, we may as well 6665 remove redundant relocs. */ 6666 rel->r_offset += opd_adjust[(offset - opd_ent_size) / 8]; 6667 if (write_rel != rel) 6668 memcpy (write_rel, rel, sizeof (*rel)); 6669 ++write_rel; 6670 } 6671 } 6672 6673 sec->size = wptr - new_contents; 6674 sec->reloc_count = write_rel - relstart; 6675 if (add_aux_fields) 6676 { 6677 free (sec->contents); 6678 sec->contents = new_contents; 6679 } 6680 6681 /* Fudge the header size too, as this is used later in 6682 elf_bfd_final_link if we are emitting relocs. */ 6683 elf_section_data (sec)->rel_hdr.sh_size 6684 = sec->reloc_count * elf_section_data (sec)->rel_hdr.sh_entsize; 6685 BFD_ASSERT (elf_section_data (sec)->rel_hdr2 == NULL); 6686 some_edited = TRUE; 6687 } 6688 else if (elf_section_data (sec)->relocs != relstart) 6689 free (relstart); 6690 6691 if (local_syms != NULL 6692 && symtab_hdr->contents != (unsigned char *) local_syms) 6693 { 6694 if (!info->keep_memory) 6695 free (local_syms); 6696 else 6697 symtab_hdr->contents = (unsigned char *) local_syms; 6698 } 6699 } 6700 6701 if (some_edited) 6702 elf_link_hash_traverse (elf_hash_table (info), adjust_opd_syms, NULL); 6703 6704 /* If we are doing a final link and the last .opd entry is just 16 byte 6705 long, add a 8 byte padding after it. */ 6706 if (need_pad != NULL && !info->relocatable) 6707 { 6708 bfd_byte *p; 6709 6710 if ((need_pad->flags & SEC_IN_MEMORY) == 0) 6711 { 6712 BFD_ASSERT (need_pad->size > 0); 6713 6714 p = bfd_malloc (need_pad->size + 8); 6715 if (p == NULL) 6716 return FALSE; 6717 6718 if (! bfd_get_section_contents (need_pad->owner, need_pad, 6719 p, 0, need_pad->size)) 6720 return FALSE; 6721 6722 need_pad->contents = p; 6723 need_pad->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS); 6724 } 6725 else 6726 { 6727 p = bfd_realloc (need_pad->contents, need_pad->size + 8); 6728 if (p == NULL) 6729 return FALSE; 6730 6731 need_pad->contents = p; 6732 } 6733 6734 memset (need_pad->contents + need_pad->size, 0, 8); 6735 need_pad->size += 8; 6736 } 6737 6738 return TRUE; 6739} 6740 6741/* Set htab->tls_get_addr and call the generic ELF tls_setup function. */ 6742 6743asection * 6744ppc64_elf_tls_setup (bfd *obfd, struct bfd_link_info *info) 6745{ 6746 struct ppc_link_hash_table *htab; 6747 6748 htab = ppc_hash_table (info); 6749 if (htab->tls_get_addr != NULL) 6750 { 6751 struct ppc_link_hash_entry *h = htab->tls_get_addr; 6752 6753 while (h->elf.root.type == bfd_link_hash_indirect 6754 || h->elf.root.type == bfd_link_hash_warning) 6755 h = (struct ppc_link_hash_entry *) h->elf.root.u.i.link; 6756 6757 htab->tls_get_addr = h; 6758 6759 if (htab->tls_get_addr_fd == NULL 6760 && h->oh != NULL 6761 && h->oh->is_func_descriptor 6762 && (h->oh->elf.root.type == bfd_link_hash_defined 6763 || h->oh->elf.root.type == bfd_link_hash_defweak)) 6764 htab->tls_get_addr_fd = h->oh; 6765 } 6766 6767 if (htab->tls_get_addr_fd != NULL) 6768 { 6769 struct ppc_link_hash_entry *h = htab->tls_get_addr_fd; 6770 6771 while (h->elf.root.type == bfd_link_hash_indirect 6772 || h->elf.root.type == bfd_link_hash_warning) 6773 h = (struct ppc_link_hash_entry *) h->elf.root.u.i.link; 6774 6775 htab->tls_get_addr_fd = h; 6776 } 6777 6778 return _bfd_elf_tls_setup (obfd, info); 6779} 6780 6781/* Run through all the TLS relocs looking for optimization 6782 opportunities. The linker has been hacked (see ppc64elf.em) to do 6783 a preliminary section layout so that we know the TLS segment 6784 offsets. We can't optimize earlier because some optimizations need 6785 to know the tp offset, and we need to optimize before allocating 6786 dynamic relocations. */ 6787 6788bfd_boolean 6789ppc64_elf_tls_optimize (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) 6790{ 6791 bfd *ibfd; 6792 asection *sec; 6793 struct ppc_link_hash_table *htab; 6794 6795 if (info->relocatable || info->shared) 6796 return TRUE; 6797 6798 htab = ppc_hash_table (info); 6799 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 6800 { 6801 Elf_Internal_Sym *locsyms = NULL; 6802 asection *toc = bfd_get_section_by_name (ibfd, ".toc"); 6803 unsigned char *toc_ref = NULL; 6804 6805 /* Look at all the sections for this file, with TOC last. */ 6806 for (sec = (ibfd->sections == toc && toc && toc->next ? toc->next 6807 : ibfd->sections); 6808 sec != NULL; 6809 sec = (sec == toc ? NULL 6810 : sec->next == NULL ? toc 6811 : sec->next == toc && toc->next ? toc->next 6812 : sec->next)) 6813 if (sec->has_tls_reloc && !bfd_is_abs_section (sec->output_section)) 6814 { 6815 Elf_Internal_Rela *relstart, *rel, *relend; 6816 int expecting_tls_get_addr; 6817 long toc_ref_index = 0; 6818 6819 /* Read the relocations. */ 6820 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 6821 info->keep_memory); 6822 if (relstart == NULL) 6823 return FALSE; 6824 6825 expecting_tls_get_addr = 0; 6826 relend = relstart + sec->reloc_count; 6827 for (rel = relstart; rel < relend; rel++) 6828 { 6829 enum elf_ppc64_reloc_type r_type; 6830 unsigned long r_symndx; 6831 struct elf_link_hash_entry *h; 6832 Elf_Internal_Sym *sym; 6833 asection *sym_sec; 6834 char *tls_mask; 6835 char tls_set, tls_clear, tls_type = 0; 6836 bfd_vma value; 6837 bfd_boolean ok_tprel, is_local; 6838 6839 r_symndx = ELF64_R_SYM (rel->r_info); 6840 if (!get_sym_h (&h, &sym, &sym_sec, &tls_mask, &locsyms, 6841 r_symndx, ibfd)) 6842 { 6843 err_free_rel: 6844 if (elf_section_data (sec)->relocs != relstart) 6845 free (relstart); 6846 if (toc_ref != NULL) 6847 free (toc_ref); 6848 if (locsyms != NULL 6849 && (elf_tdata (ibfd)->symtab_hdr.contents 6850 != (unsigned char *) locsyms)) 6851 free (locsyms); 6852 return FALSE; 6853 } 6854 6855 if (h != NULL) 6856 { 6857 if (h->root.type != bfd_link_hash_defined 6858 && h->root.type != bfd_link_hash_defweak) 6859 continue; 6860 value = h->root.u.def.value; 6861 } 6862 else 6863 /* Symbols referenced by TLS relocs must be of type 6864 STT_TLS. So no need for .opd local sym adjust. */ 6865 value = sym->st_value; 6866 6867 ok_tprel = FALSE; 6868 is_local = FALSE; 6869 if (h == NULL 6870 || !h->def_dynamic) 6871 { 6872 is_local = TRUE; 6873 value += sym_sec->output_offset; 6874 value += sym_sec->output_section->vma; 6875 value -= htab->elf.tls_sec->vma; 6876 ok_tprel = (value + TP_OFFSET + ((bfd_vma) 1 << 31) 6877 < (bfd_vma) 1 << 32); 6878 } 6879 6880 r_type = ELF64_R_TYPE (rel->r_info); 6881 switch (r_type) 6882 { 6883 case R_PPC64_GOT_TLSLD16: 6884 case R_PPC64_GOT_TLSLD16_LO: 6885 case R_PPC64_GOT_TLSLD16_HI: 6886 case R_PPC64_GOT_TLSLD16_HA: 6887 /* These relocs should never be against a symbol 6888 defined in a shared lib. Leave them alone if 6889 that turns out to be the case. */ 6890 ppc64_tlsld_got (ibfd)->refcount -= 1; 6891 if (!is_local) 6892 continue; 6893 6894 /* LD -> LE */ 6895 tls_set = 0; 6896 tls_clear = TLS_LD; 6897 tls_type = TLS_TLS | TLS_LD; 6898 expecting_tls_get_addr = 1; 6899 break; 6900 6901 case R_PPC64_GOT_TLSGD16: 6902 case R_PPC64_GOT_TLSGD16_LO: 6903 case R_PPC64_GOT_TLSGD16_HI: 6904 case R_PPC64_GOT_TLSGD16_HA: 6905 if (ok_tprel) 6906 /* GD -> LE */ 6907 tls_set = 0; 6908 else 6909 /* GD -> IE */ 6910 tls_set = TLS_TLS | TLS_TPRELGD; 6911 tls_clear = TLS_GD; 6912 tls_type = TLS_TLS | TLS_GD; 6913 expecting_tls_get_addr = 1; 6914 break; 6915 6916 case R_PPC64_GOT_TPREL16_DS: 6917 case R_PPC64_GOT_TPREL16_LO_DS: 6918 case R_PPC64_GOT_TPREL16_HI: 6919 case R_PPC64_GOT_TPREL16_HA: 6920 expecting_tls_get_addr = 0; 6921 if (ok_tprel) 6922 { 6923 /* IE -> LE */ 6924 tls_set = 0; 6925 tls_clear = TLS_TPREL; 6926 tls_type = TLS_TLS | TLS_TPREL; 6927 break; 6928 } 6929 else 6930 continue; 6931 6932 case R_PPC64_REL14: 6933 case R_PPC64_REL14_BRTAKEN: 6934 case R_PPC64_REL14_BRNTAKEN: 6935 case R_PPC64_REL24: 6936 if (h != NULL 6937 && (h == &htab->tls_get_addr->elf 6938 || h == &htab->tls_get_addr_fd->elf)) 6939 { 6940 if (!expecting_tls_get_addr 6941 && rel != relstart 6942 && ((ELF64_R_TYPE (rel[-1].r_info) 6943 == R_PPC64_TOC16) 6944 || (ELF64_R_TYPE (rel[-1].r_info) 6945 == R_PPC64_TOC16_LO))) 6946 { 6947 /* Check for toc tls entries. */ 6948 char *toc_tls; 6949 int retval; 6950 6951 retval = get_tls_mask (&toc_tls, NULL, &locsyms, 6952 rel - 1, ibfd); 6953 if (retval == 0) 6954 goto err_free_rel; 6955 if (retval > 1 && toc_tls != NULL) 6956 { 6957 expecting_tls_get_addr = 1; 6958 if (toc_ref != NULL) 6959 toc_ref[toc_ref_index] = 1; 6960 } 6961 } 6962 6963 if (expecting_tls_get_addr) 6964 { 6965 struct plt_entry *ent; 6966 for (ent = h->plt.plist; ent; ent = ent->next) 6967 if (ent->addend == 0) 6968 { 6969 if (ent->plt.refcount > 0) 6970 ent->plt.refcount -= 1; 6971 break; 6972 } 6973 } 6974 } 6975 expecting_tls_get_addr = 0; 6976 continue; 6977 6978 case R_PPC64_TOC16: 6979 case R_PPC64_TOC16_LO: 6980 case R_PPC64_TLS: 6981 expecting_tls_get_addr = 0; 6982 if (sym_sec == toc && toc != NULL) 6983 { 6984 /* Mark this toc entry as referenced by a TLS 6985 code sequence. We can do that now in the 6986 case of R_PPC64_TLS, and after checking for 6987 tls_get_addr for the TOC16 relocs. */ 6988 if (toc_ref == NULL) 6989 { 6990 toc_ref = bfd_zmalloc (toc->size / 8); 6991 if (toc_ref == NULL) 6992 goto err_free_rel; 6993 } 6994 if (h != NULL) 6995 value = h->root.u.def.value; 6996 else 6997 value = sym->st_value; 6998 value += rel->r_addend; 6999 BFD_ASSERT (value < toc->size && value % 8 == 0); 7000 toc_ref_index = value / 8; 7001 if (r_type == R_PPC64_TLS) 7002 toc_ref[toc_ref_index] = 1; 7003 } 7004 continue; 7005 7006 case R_PPC64_TPREL64: 7007 expecting_tls_get_addr = 0; 7008 if (sec != toc 7009 || toc_ref == NULL 7010 || !toc_ref[rel->r_offset / 8]) 7011 continue; 7012 if (ok_tprel) 7013 { 7014 /* IE -> LE */ 7015 tls_set = TLS_EXPLICIT; 7016 tls_clear = TLS_TPREL; 7017 break; 7018 } 7019 else 7020 continue; 7021 7022 case R_PPC64_DTPMOD64: 7023 expecting_tls_get_addr = 0; 7024 if (sec != toc 7025 || toc_ref == NULL 7026 || !toc_ref[rel->r_offset / 8]) 7027 continue; 7028 if (rel + 1 < relend 7029 && (rel[1].r_info 7030 == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64)) 7031 && rel[1].r_offset == rel->r_offset + 8) 7032 { 7033 if (ok_tprel) 7034 /* GD -> LE */ 7035 tls_set = TLS_EXPLICIT | TLS_GD; 7036 else 7037 /* GD -> IE */ 7038 tls_set = TLS_EXPLICIT | TLS_GD | TLS_TPRELGD; 7039 tls_clear = TLS_GD; 7040 } 7041 else 7042 { 7043 if (!is_local) 7044 continue; 7045 7046 /* LD -> LE */ 7047 tls_set = TLS_EXPLICIT; 7048 tls_clear = TLS_LD; 7049 } 7050 break; 7051 7052 default: 7053 expecting_tls_get_addr = 0; 7054 continue; 7055 } 7056 7057 if ((tls_set & TLS_EXPLICIT) == 0) 7058 { 7059 struct got_entry *ent; 7060 7061 /* Adjust got entry for this reloc. */ 7062 if (h != NULL) 7063 ent = h->got.glist; 7064 else 7065 ent = elf_local_got_ents (ibfd)[r_symndx]; 7066 7067 for (; ent != NULL; ent = ent->next) 7068 if (ent->addend == rel->r_addend 7069 && ent->owner == ibfd 7070 && ent->tls_type == tls_type) 7071 break; 7072 if (ent == NULL) 7073 abort (); 7074 7075 if (tls_set == 0) 7076 { 7077 /* We managed to get rid of a got entry. */ 7078 if (ent->got.refcount > 0) 7079 ent->got.refcount -= 1; 7080 } 7081 } 7082 else 7083 { 7084 /* If we got rid of a DTPMOD/DTPREL reloc pair then 7085 we'll lose one or two dyn relocs. */ 7086 if (!dec_dynrel_count (rel->r_info, sec, info, 7087 NULL, h, sym_sec)) 7088 return FALSE; 7089 7090 if (tls_set == (TLS_EXPLICIT | TLS_GD)) 7091 { 7092 if (!dec_dynrel_count ((rel + 1)->r_info, sec, info, 7093 NULL, h, sym_sec)) 7094 return FALSE; 7095 } 7096 } 7097 7098 *tls_mask |= tls_set; 7099 *tls_mask &= ~tls_clear; 7100 } 7101 7102 if (elf_section_data (sec)->relocs != relstart) 7103 free (relstart); 7104 } 7105 7106 if (toc_ref != NULL) 7107 free (toc_ref); 7108 7109 if (locsyms != NULL 7110 && (elf_tdata (ibfd)->symtab_hdr.contents 7111 != (unsigned char *) locsyms)) 7112 { 7113 if (!info->keep_memory) 7114 free (locsyms); 7115 else 7116 elf_tdata (ibfd)->symtab_hdr.contents = (unsigned char *) locsyms; 7117 } 7118 } 7119 return TRUE; 7120} 7121 7122/* Called via elf_link_hash_traverse from ppc64_elf_edit_toc to adjust 7123 the values of any global symbols in a toc section that has been 7124 edited. Globals in toc sections should be a rarity, so this function 7125 sets a flag if any are found in toc sections other than the one just 7126 edited, so that futher hash table traversals can be avoided. */ 7127 7128struct adjust_toc_info 7129{ 7130 asection *toc; 7131 unsigned long *skip; 7132 bfd_boolean global_toc_syms; 7133}; 7134 7135static bfd_boolean 7136adjust_toc_syms (struct elf_link_hash_entry *h, void *inf) 7137{ 7138 struct ppc_link_hash_entry *eh; 7139 struct adjust_toc_info *toc_inf = (struct adjust_toc_info *) inf; 7140 7141 if (h->root.type == bfd_link_hash_indirect) 7142 return TRUE; 7143 7144 if (h->root.type == bfd_link_hash_warning) 7145 h = (struct elf_link_hash_entry *) h->root.u.i.link; 7146 7147 if (h->root.type != bfd_link_hash_defined 7148 && h->root.type != bfd_link_hash_defweak) 7149 return TRUE; 7150 7151 eh = (struct ppc_link_hash_entry *) h; 7152 if (eh->adjust_done) 7153 return TRUE; 7154 7155 if (eh->elf.root.u.def.section == toc_inf->toc) 7156 { 7157 unsigned long skip = toc_inf->skip[eh->elf.root.u.def.value >> 3]; 7158 if (skip != (unsigned long) -1) 7159 eh->elf.root.u.def.value -= skip; 7160 else 7161 { 7162 (*_bfd_error_handler) 7163 (_("%s defined in removed toc entry"), eh->elf.root.root.string); 7164 eh->elf.root.u.def.section = &bfd_abs_section; 7165 eh->elf.root.u.def.value = 0; 7166 } 7167 eh->adjust_done = 1; 7168 } 7169 else if (strcmp (eh->elf.root.u.def.section->name, ".toc") == 0) 7170 toc_inf->global_toc_syms = TRUE; 7171 7172 return TRUE; 7173} 7174 7175/* Examine all relocs referencing .toc sections in order to remove 7176 unused .toc entries. */ 7177 7178bfd_boolean 7179ppc64_elf_edit_toc (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) 7180{ 7181 bfd *ibfd; 7182 struct adjust_toc_info toc_inf; 7183 7184 toc_inf.global_toc_syms = TRUE; 7185 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 7186 { 7187 asection *toc, *sec; 7188 Elf_Internal_Shdr *symtab_hdr; 7189 Elf_Internal_Sym *local_syms; 7190 struct elf_link_hash_entry **sym_hashes; 7191 Elf_Internal_Rela *relstart, *rel; 7192 unsigned long *skip, *drop; 7193 unsigned char *used; 7194 unsigned char *keep, last, some_unused; 7195 7196 toc = bfd_get_section_by_name (ibfd, ".toc"); 7197 if (toc == NULL 7198 || toc->size == 0 7199 || toc->sec_info_type == ELF_INFO_TYPE_JUST_SYMS 7200 || elf_discarded_section (toc)) 7201 continue; 7202 7203 local_syms = NULL; 7204 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 7205 sym_hashes = elf_sym_hashes (ibfd); 7206 7207 /* Look at sections dropped from the final link. */ 7208 skip = NULL; 7209 relstart = NULL; 7210 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 7211 { 7212 if (sec->reloc_count == 0 7213 || !elf_discarded_section (sec) 7214 || get_opd_info (sec) 7215 || (sec->flags & SEC_ALLOC) == 0 7216 || (sec->flags & SEC_DEBUGGING) != 0) 7217 continue; 7218 7219 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, FALSE); 7220 if (relstart == NULL) 7221 goto error_ret; 7222 7223 /* Run through the relocs to see which toc entries might be 7224 unused. */ 7225 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 7226 { 7227 enum elf_ppc64_reloc_type r_type; 7228 unsigned long r_symndx; 7229 asection *sym_sec; 7230 struct elf_link_hash_entry *h; 7231 Elf_Internal_Sym *sym; 7232 bfd_vma val; 7233 7234 r_type = ELF64_R_TYPE (rel->r_info); 7235 switch (r_type) 7236 { 7237 default: 7238 continue; 7239 7240 case R_PPC64_TOC16: 7241 case R_PPC64_TOC16_LO: 7242 case R_PPC64_TOC16_HI: 7243 case R_PPC64_TOC16_HA: 7244 case R_PPC64_TOC16_DS: 7245 case R_PPC64_TOC16_LO_DS: 7246 break; 7247 } 7248 7249 r_symndx = ELF64_R_SYM (rel->r_info); 7250 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 7251 r_symndx, ibfd)) 7252 goto error_ret; 7253 7254 if (sym_sec != toc) 7255 continue; 7256 7257 if (h != NULL) 7258 val = h->root.u.def.value; 7259 else 7260 val = sym->st_value; 7261 val += rel->r_addend; 7262 7263 if (val >= toc->size) 7264 continue; 7265 7266 /* Anything in the toc ought to be aligned to 8 bytes. 7267 If not, don't mark as unused. */ 7268 if (val & 7) 7269 continue; 7270 7271 if (skip == NULL) 7272 { 7273 skip = bfd_zmalloc (sizeof (*skip) * (toc->size + 7) / 8); 7274 if (skip == NULL) 7275 goto error_ret; 7276 } 7277 7278 skip[val >> 3] = 1; 7279 } 7280 7281 if (elf_section_data (sec)->relocs != relstart) 7282 free (relstart); 7283 } 7284 7285 if (skip == NULL) 7286 continue; 7287 7288 used = bfd_zmalloc (sizeof (*used) * (toc->size + 7) / 8); 7289 if (used == NULL) 7290 { 7291 error_ret: 7292 if (local_syms != NULL 7293 && symtab_hdr->contents != (unsigned char *) local_syms) 7294 free (local_syms); 7295 if (sec != NULL 7296 && relstart != NULL 7297 && elf_section_data (sec)->relocs != relstart) 7298 free (relstart); 7299 if (skip != NULL) 7300 free (skip); 7301 return FALSE; 7302 } 7303 7304 /* Now check all kept sections that might reference the toc. 7305 Check the toc itself last. */ 7306 for (sec = (ibfd->sections == toc && toc->next ? toc->next 7307 : ibfd->sections); 7308 sec != NULL; 7309 sec = (sec == toc ? NULL 7310 : sec->next == NULL ? toc 7311 : sec->next == toc && toc->next ? toc->next 7312 : sec->next)) 7313 { 7314 int repeat; 7315 7316 if (sec->reloc_count == 0 7317 || elf_discarded_section (sec) 7318 || get_opd_info (sec) 7319 || (sec->flags & SEC_ALLOC) == 0 7320 || (sec->flags & SEC_DEBUGGING) != 0) 7321 continue; 7322 7323 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, TRUE); 7324 if (relstart == NULL) 7325 goto error_ret; 7326 7327 /* Mark toc entries referenced as used. */ 7328 repeat = 0; 7329 do 7330 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 7331 { 7332 enum elf_ppc64_reloc_type r_type; 7333 unsigned long r_symndx; 7334 asection *sym_sec; 7335 struct elf_link_hash_entry *h; 7336 Elf_Internal_Sym *sym; 7337 bfd_vma val; 7338 7339 r_type = ELF64_R_TYPE (rel->r_info); 7340 switch (r_type) 7341 { 7342 case R_PPC64_TOC16: 7343 case R_PPC64_TOC16_LO: 7344 case R_PPC64_TOC16_HI: 7345 case R_PPC64_TOC16_HA: 7346 case R_PPC64_TOC16_DS: 7347 case R_PPC64_TOC16_LO_DS: 7348 /* In case we're taking addresses of toc entries. */ 7349 case R_PPC64_ADDR64: 7350 break; 7351 7352 default: 7353 continue; 7354 } 7355 7356 r_symndx = ELF64_R_SYM (rel->r_info); 7357 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 7358 r_symndx, ibfd)) 7359 { 7360 free (used); 7361 goto error_ret; 7362 } 7363 7364 if (sym_sec != toc) 7365 continue; 7366 7367 if (h != NULL) 7368 val = h->root.u.def.value; 7369 else 7370 val = sym->st_value; 7371 val += rel->r_addend; 7372 7373 if (val >= toc->size) 7374 continue; 7375 7376 /* For the toc section, we only mark as used if 7377 this entry itself isn't unused. */ 7378 if (sec == toc 7379 && !used[val >> 3] 7380 && (used[rel->r_offset >> 3] 7381 || !skip[rel->r_offset >> 3])) 7382 /* Do all the relocs again, to catch reference 7383 chains. */ 7384 repeat = 1; 7385 7386 used[val >> 3] = 1; 7387 } 7388 while (repeat); 7389 } 7390 7391 /* Merge the used and skip arrays. Assume that TOC 7392 doublewords not appearing as either used or unused belong 7393 to to an entry more than one doubleword in size. */ 7394 for (drop = skip, keep = used, last = 0, some_unused = 0; 7395 drop < skip + (toc->size + 7) / 8; 7396 ++drop, ++keep) 7397 { 7398 if (*keep) 7399 { 7400 *drop = 0; 7401 last = 0; 7402 } 7403 else if (*drop) 7404 { 7405 some_unused = 1; 7406 last = 1; 7407 } 7408 else 7409 *drop = last; 7410 } 7411 7412 free (used); 7413 7414 if (some_unused) 7415 { 7416 bfd_byte *contents, *src; 7417 unsigned long off; 7418 7419 /* Shuffle the toc contents, and at the same time convert the 7420 skip array from booleans into offsets. */ 7421 if (!bfd_malloc_and_get_section (ibfd, toc, &contents)) 7422 goto error_ret; 7423 7424 elf_section_data (toc)->this_hdr.contents = contents; 7425 7426 for (src = contents, off = 0, drop = skip; 7427 src < contents + toc->size; 7428 src += 8, ++drop) 7429 { 7430 if (*drop) 7431 { 7432 *drop = (unsigned long) -1; 7433 off += 8; 7434 } 7435 else if (off != 0) 7436 { 7437 *drop = off; 7438 memcpy (src - off, src, 8); 7439 } 7440 } 7441 toc->rawsize = toc->size; 7442 toc->size = src - contents - off; 7443 7444 if (toc->reloc_count != 0) 7445 { 7446 Elf_Internal_Rela *wrel; 7447 bfd_size_type sz; 7448 7449 /* Read toc relocs. */ 7450 relstart = _bfd_elf_link_read_relocs (ibfd, toc, NULL, NULL, 7451 TRUE); 7452 if (relstart == NULL) 7453 goto error_ret; 7454 7455 /* Remove unused toc relocs, and adjust those we keep. */ 7456 wrel = relstart; 7457 for (rel = relstart; rel < relstart + toc->reloc_count; ++rel) 7458 if (skip[rel->r_offset >> 3] != (unsigned long) -1) 7459 { 7460 wrel->r_offset = rel->r_offset - skip[rel->r_offset >> 3]; 7461 wrel->r_info = rel->r_info; 7462 wrel->r_addend = rel->r_addend; 7463 ++wrel; 7464 } 7465 else if (!dec_dynrel_count (rel->r_info, toc, info, 7466 &local_syms, NULL, NULL)) 7467 goto error_ret; 7468 7469 toc->reloc_count = wrel - relstart; 7470 sz = elf_section_data (toc)->rel_hdr.sh_entsize; 7471 elf_section_data (toc)->rel_hdr.sh_size = toc->reloc_count * sz; 7472 BFD_ASSERT (elf_section_data (toc)->rel_hdr2 == NULL); 7473 } 7474 7475 /* Adjust addends for relocs against the toc section sym. */ 7476 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 7477 { 7478 if (sec->reloc_count == 0 7479 || elf_discarded_section (sec)) 7480 continue; 7481 7482 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 7483 TRUE); 7484 if (relstart == NULL) 7485 goto error_ret; 7486 7487 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 7488 { 7489 enum elf_ppc64_reloc_type r_type; 7490 unsigned long r_symndx; 7491 asection *sym_sec; 7492 struct elf_link_hash_entry *h; 7493 Elf_Internal_Sym *sym; 7494 7495 r_type = ELF64_R_TYPE (rel->r_info); 7496 switch (r_type) 7497 { 7498 default: 7499 continue; 7500 7501 case R_PPC64_TOC16: 7502 case R_PPC64_TOC16_LO: 7503 case R_PPC64_TOC16_HI: 7504 case R_PPC64_TOC16_HA: 7505 case R_PPC64_TOC16_DS: 7506 case R_PPC64_TOC16_LO_DS: 7507 case R_PPC64_ADDR64: 7508 break; 7509 } 7510 7511 r_symndx = ELF64_R_SYM (rel->r_info); 7512 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 7513 r_symndx, ibfd)) 7514 goto error_ret; 7515 7516 if (sym_sec != toc || h != NULL || sym->st_value != 0) 7517 continue; 7518 7519 rel->r_addend -= skip[rel->r_addend >> 3]; 7520 } 7521 } 7522 7523 /* We shouldn't have local or global symbols defined in the TOC, 7524 but handle them anyway. */ 7525 if (local_syms != NULL) 7526 { 7527 Elf_Internal_Sym *sym; 7528 7529 for (sym = local_syms; 7530 sym < local_syms + symtab_hdr->sh_info; 7531 ++sym) 7532 if (sym->st_shndx != SHN_UNDEF 7533 && (sym->st_shndx < SHN_LORESERVE 7534 || sym->st_shndx > SHN_HIRESERVE) 7535 && sym->st_value != 0 7536 && bfd_section_from_elf_index (ibfd, sym->st_shndx) == toc) 7537 { 7538 if (skip[sym->st_value >> 3] != (unsigned long) -1) 7539 sym->st_value -= skip[sym->st_value >> 3]; 7540 else 7541 { 7542 (*_bfd_error_handler) 7543 (_("%s defined in removed toc entry"), 7544 bfd_elf_sym_name (ibfd, symtab_hdr, sym, 7545 NULL)); 7546 sym->st_value = 0; 7547 sym->st_shndx = SHN_ABS; 7548 } 7549 symtab_hdr->contents = (unsigned char *) local_syms; 7550 } 7551 } 7552 7553 /* Finally, adjust any global syms defined in the toc. */ 7554 if (toc_inf.global_toc_syms) 7555 { 7556 toc_inf.toc = toc; 7557 toc_inf.skip = skip; 7558 toc_inf.global_toc_syms = FALSE; 7559 elf_link_hash_traverse (elf_hash_table (info), adjust_toc_syms, 7560 &toc_inf); 7561 } 7562 } 7563 7564 if (local_syms != NULL 7565 && symtab_hdr->contents != (unsigned char *) local_syms) 7566 { 7567 if (!info->keep_memory) 7568 free (local_syms); 7569 else 7570 symtab_hdr->contents = (unsigned char *) local_syms; 7571 } 7572 free (skip); 7573 } 7574 7575 return TRUE; 7576} 7577 7578/* Allocate space in .plt, .got and associated reloc sections for 7579 dynamic relocs. */ 7580 7581static bfd_boolean 7582allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) 7583{ 7584 struct bfd_link_info *info; 7585 struct ppc_link_hash_table *htab; 7586 asection *s; 7587 struct ppc_link_hash_entry *eh; 7588 struct ppc_dyn_relocs *p; 7589 struct got_entry *gent; 7590 7591 if (h->root.type == bfd_link_hash_indirect) 7592 return TRUE; 7593 7594 if (h->root.type == bfd_link_hash_warning) 7595 h = (struct elf_link_hash_entry *) h->root.u.i.link; 7596 7597 info = (struct bfd_link_info *) inf; 7598 htab = ppc_hash_table (info); 7599 7600 if (htab->elf.dynamic_sections_created 7601 && h->dynindx != -1 7602 && WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info->shared, h)) 7603 { 7604 struct plt_entry *pent; 7605 bfd_boolean doneone = FALSE; 7606 for (pent = h->plt.plist; pent != NULL; pent = pent->next) 7607 if (pent->plt.refcount > 0) 7608 { 7609 /* If this is the first .plt entry, make room for the special 7610 first entry. */ 7611 s = htab->plt; 7612 if (s->size == 0) 7613 s->size += PLT_INITIAL_ENTRY_SIZE; 7614 7615 pent->plt.offset = s->size; 7616 7617 /* Make room for this entry. */ 7618 s->size += PLT_ENTRY_SIZE; 7619 7620 /* Make room for the .glink code. */ 7621 s = htab->glink; 7622 if (s->size == 0) 7623 s->size += GLINK_CALL_STUB_SIZE; 7624 /* We need bigger stubs past index 32767. */ 7625 if (s->size >= GLINK_CALL_STUB_SIZE + 32768*2*4) 7626 s->size += 4; 7627 s->size += 2*4; 7628 7629 /* We also need to make an entry in the .rela.plt section. */ 7630 s = htab->relplt; 7631 s->size += sizeof (Elf64_External_Rela); 7632 doneone = TRUE; 7633 } 7634 else 7635 pent->plt.offset = (bfd_vma) -1; 7636 if (!doneone) 7637 { 7638 h->plt.plist = NULL; 7639 h->needs_plt = 0; 7640 } 7641 } 7642 else 7643 { 7644 h->plt.plist = NULL; 7645 h->needs_plt = 0; 7646 } 7647 7648 eh = (struct ppc_link_hash_entry *) h; 7649 /* Run through the TLS GD got entries first if we're changing them 7650 to TPREL. */ 7651 if ((eh->tls_mask & TLS_TPRELGD) != 0) 7652 for (gent = h->got.glist; gent != NULL; gent = gent->next) 7653 if (gent->got.refcount > 0 7654 && (gent->tls_type & TLS_GD) != 0) 7655 { 7656 /* This was a GD entry that has been converted to TPREL. If 7657 there happens to be a TPREL entry we can use that one. */ 7658 struct got_entry *ent; 7659 for (ent = h->got.glist; ent != NULL; ent = ent->next) 7660 if (ent->got.refcount > 0 7661 && (ent->tls_type & TLS_TPREL) != 0 7662 && ent->addend == gent->addend 7663 && ent->owner == gent->owner) 7664 { 7665 gent->got.refcount = 0; 7666 break; 7667 } 7668 7669 /* If not, then we'll be using our own TPREL entry. */ 7670 if (gent->got.refcount != 0) 7671 gent->tls_type = TLS_TLS | TLS_TPREL; 7672 } 7673 7674 for (gent = h->got.glist; gent != NULL; gent = gent->next) 7675 if (gent->got.refcount > 0) 7676 { 7677 bfd_boolean dyn; 7678 7679 /* Make sure this symbol is output as a dynamic symbol. 7680 Undefined weak syms won't yet be marked as dynamic, 7681 nor will all TLS symbols. */ 7682 if (h->dynindx == -1 7683 && !h->forced_local) 7684 { 7685 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 7686 return FALSE; 7687 } 7688 7689 if ((gent->tls_type & TLS_LD) != 0 7690 && !h->def_dynamic) 7691 { 7692 gent->got.offset = ppc64_tlsld_got (gent->owner)->offset; 7693 continue; 7694 } 7695 7696 s = ppc64_elf_tdata (gent->owner)->got; 7697 gent->got.offset = s->size; 7698 s->size 7699 += (gent->tls_type & eh->tls_mask & (TLS_GD | TLS_LD)) ? 16 : 8; 7700 dyn = htab->elf.dynamic_sections_created; 7701 if ((info->shared 7702 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)) 7703 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 7704 || h->root.type != bfd_link_hash_undefweak)) 7705 ppc64_elf_tdata (gent->owner)->relgot->size 7706 += (gent->tls_type & eh->tls_mask & TLS_GD 7707 ? 2 * sizeof (Elf64_External_Rela) 7708 : sizeof (Elf64_External_Rela)); 7709 } 7710 else 7711 gent->got.offset = (bfd_vma) -1; 7712 7713 if (eh->dyn_relocs == NULL) 7714 return TRUE; 7715 7716 /* In the shared -Bsymbolic case, discard space allocated for 7717 dynamic pc-relative relocs against symbols which turn out to be 7718 defined in regular objects. For the normal shared case, discard 7719 space for relocs that have become local due to symbol visibility 7720 changes. */ 7721 7722 if (info->shared) 7723 { 7724 /* Relocs that use pc_count are those that appear on a call insn, 7725 or certain REL relocs (see MUST_BE_DYN_RELOC) that can be 7726 generated via assembly. We want calls to protected symbols to 7727 resolve directly to the function rather than going via the plt. 7728 If people want function pointer comparisons to work as expected 7729 then they should avoid writing weird assembly. */ 7730 if (SYMBOL_CALLS_LOCAL (info, h)) 7731 { 7732 struct ppc_dyn_relocs **pp; 7733 7734 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 7735 { 7736 p->count -= p->pc_count; 7737 p->pc_count = 0; 7738 if (p->count == 0) 7739 *pp = p->next; 7740 else 7741 pp = &p->next; 7742 } 7743 } 7744 7745 /* Also discard relocs on undefined weak syms with non-default 7746 visibility. */ 7747 if (eh->dyn_relocs != NULL 7748 && h->root.type == bfd_link_hash_undefweak) 7749 { 7750 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 7751 eh->dyn_relocs = NULL; 7752 7753 /* Make sure this symbol is output as a dynamic symbol. 7754 Undefined weak syms won't yet be marked as dynamic. */ 7755 else if (h->dynindx == -1 7756 && !h->forced_local) 7757 { 7758 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 7759 return FALSE; 7760 } 7761 } 7762 } 7763 else if (ELIMINATE_COPY_RELOCS) 7764 { 7765 /* For the non-shared case, discard space for relocs against 7766 symbols which turn out to need copy relocs or are not 7767 dynamic. */ 7768 7769 if (!h->non_got_ref 7770 && h->def_dynamic 7771 && !h->def_regular) 7772 { 7773 /* Make sure this symbol is output as a dynamic symbol. 7774 Undefined weak syms won't yet be marked as dynamic. */ 7775 if (h->dynindx == -1 7776 && !h->forced_local) 7777 { 7778 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 7779 return FALSE; 7780 } 7781 7782 /* If that succeeded, we know we'll be keeping all the 7783 relocs. */ 7784 if (h->dynindx != -1) 7785 goto keep; 7786 } 7787 7788 eh->dyn_relocs = NULL; 7789 7790 keep: ; 7791 } 7792 7793 /* Finally, allocate space. */ 7794 for (p = eh->dyn_relocs; p != NULL; p = p->next) 7795 { 7796 asection *sreloc = elf_section_data (p->sec)->sreloc; 7797 sreloc->size += p->count * sizeof (Elf64_External_Rela); 7798 } 7799 7800 return TRUE; 7801} 7802 7803/* Find any dynamic relocs that apply to read-only sections. */ 7804 7805static bfd_boolean 7806readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) 7807{ 7808 struct ppc_link_hash_entry *eh; 7809 struct ppc_dyn_relocs *p; 7810 7811 if (h->root.type == bfd_link_hash_warning) 7812 h = (struct elf_link_hash_entry *) h->root.u.i.link; 7813 7814 eh = (struct ppc_link_hash_entry *) h; 7815 for (p = eh->dyn_relocs; p != NULL; p = p->next) 7816 { 7817 asection *s = p->sec->output_section; 7818 7819 if (s != NULL && (s->flags & SEC_READONLY) != 0) 7820 { 7821 struct bfd_link_info *info = inf; 7822 7823 info->flags |= DF_TEXTREL; 7824 7825 /* Not an error, just cut short the traversal. */ 7826 return FALSE; 7827 } 7828 } 7829 return TRUE; 7830} 7831 7832/* Set the sizes of the dynamic sections. */ 7833 7834static bfd_boolean 7835ppc64_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 7836 struct bfd_link_info *info) 7837{ 7838 struct ppc_link_hash_table *htab; 7839 bfd *dynobj; 7840 asection *s; 7841 bfd_boolean relocs; 7842 bfd *ibfd; 7843 7844 htab = ppc_hash_table (info); 7845 dynobj = htab->elf.dynobj; 7846 if (dynobj == NULL) 7847 abort (); 7848 7849 if (htab->elf.dynamic_sections_created) 7850 { 7851 /* Set the contents of the .interp section to the interpreter. */ 7852 if (info->executable) 7853 { 7854 s = bfd_get_section_by_name (dynobj, ".interp"); 7855 if (s == NULL) 7856 abort (); 7857 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 7858 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 7859 } 7860 } 7861 7862 /* Set up .got offsets for local syms, and space for local dynamic 7863 relocs. */ 7864 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 7865 { 7866 struct got_entry **lgot_ents; 7867 struct got_entry **end_lgot_ents; 7868 char *lgot_masks; 7869 bfd_size_type locsymcount; 7870 Elf_Internal_Shdr *symtab_hdr; 7871 asection *srel; 7872 7873 if (!is_ppc64_elf_target (ibfd->xvec)) 7874 continue; 7875 7876 if (ppc64_tlsld_got (ibfd)->refcount > 0) 7877 { 7878 s = ppc64_elf_tdata (ibfd)->got; 7879 ppc64_tlsld_got (ibfd)->offset = s->size; 7880 s->size += 16; 7881 if (info->shared) 7882 { 7883 srel = ppc64_elf_tdata (ibfd)->relgot; 7884 srel->size += sizeof (Elf64_External_Rela); 7885 } 7886 } 7887 else 7888 ppc64_tlsld_got (ibfd)->offset = (bfd_vma) -1; 7889 7890 for (s = ibfd->sections; s != NULL; s = s->next) 7891 { 7892 struct ppc_dyn_relocs *p; 7893 7894 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 7895 { 7896 if (!bfd_is_abs_section (p->sec) 7897 && bfd_is_abs_section (p->sec->output_section)) 7898 { 7899 /* Input section has been discarded, either because 7900 it is a copy of a linkonce section or due to 7901 linker script /DISCARD/, so we'll be discarding 7902 the relocs too. */ 7903 } 7904 else if (p->count != 0) 7905 { 7906 srel = elf_section_data (p->sec)->sreloc; 7907 srel->size += p->count * sizeof (Elf64_External_Rela); 7908 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 7909 info->flags |= DF_TEXTREL; 7910 } 7911 } 7912 } 7913 7914 lgot_ents = elf_local_got_ents (ibfd); 7915 if (!lgot_ents) 7916 continue; 7917 7918 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 7919 locsymcount = symtab_hdr->sh_info; 7920 end_lgot_ents = lgot_ents + locsymcount; 7921 lgot_masks = (char *) end_lgot_ents; 7922 s = ppc64_elf_tdata (ibfd)->got; 7923 srel = ppc64_elf_tdata (ibfd)->relgot; 7924 for (; lgot_ents < end_lgot_ents; ++lgot_ents, ++lgot_masks) 7925 { 7926 struct got_entry *ent; 7927 7928 for (ent = *lgot_ents; ent != NULL; ent = ent->next) 7929 if (ent->got.refcount > 0) 7930 { 7931 if ((ent->tls_type & *lgot_masks & TLS_LD) != 0) 7932 { 7933 if (ppc64_tlsld_got (ibfd)->offset == (bfd_vma) -1) 7934 { 7935 ppc64_tlsld_got (ibfd)->offset = s->size; 7936 s->size += 16; 7937 if (info->shared) 7938 srel->size += sizeof (Elf64_External_Rela); 7939 } 7940 ent->got.offset = ppc64_tlsld_got (ibfd)->offset; 7941 } 7942 else 7943 { 7944 ent->got.offset = s->size; 7945 if ((ent->tls_type & *lgot_masks & TLS_GD) != 0) 7946 { 7947 s->size += 16; 7948 if (info->shared) 7949 srel->size += 2 * sizeof (Elf64_External_Rela); 7950 } 7951 else 7952 { 7953 s->size += 8; 7954 if (info->shared) 7955 srel->size += sizeof (Elf64_External_Rela); 7956 } 7957 } 7958 } 7959 else 7960 ent->got.offset = (bfd_vma) -1; 7961 } 7962 } 7963 7964 /* Allocate global sym .plt and .got entries, and space for global 7965 sym dynamic relocs. */ 7966 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); 7967 7968 /* We now have determined the sizes of the various dynamic sections. 7969 Allocate memory for them. */ 7970 relocs = FALSE; 7971 for (s = dynobj->sections; s != NULL; s = s->next) 7972 { 7973 if ((s->flags & SEC_LINKER_CREATED) == 0) 7974 continue; 7975 7976 if (s == htab->brlt || s == htab->relbrlt) 7977 /* These haven't been allocated yet; don't strip. */ 7978 continue; 7979 else if (s == htab->got 7980 || s == htab->plt 7981 || s == htab->glink 7982 || s == htab->dynbss) 7983 { 7984 /* Strip this section if we don't need it; see the 7985 comment below. */ 7986 } 7987 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 7988 { 7989 if (s->size != 0) 7990 { 7991 if (s != htab->relplt) 7992 relocs = TRUE; 7993 7994 /* We use the reloc_count field as a counter if we need 7995 to copy relocs into the output file. */ 7996 s->reloc_count = 0; 7997 } 7998 } 7999 else 8000 { 8001 /* It's not one of our sections, so don't allocate space. */ 8002 continue; 8003 } 8004 8005 if (s->size == 0) 8006 { 8007 /* If we don't need this section, strip it from the 8008 output file. This is mostly to handle .rela.bss and 8009 .rela.plt. We must create both sections in 8010 create_dynamic_sections, because they must be created 8011 before the linker maps input sections to output 8012 sections. The linker does that before 8013 adjust_dynamic_symbol is called, and it is that 8014 function which decides whether anything needs to go 8015 into these sections. */ 8016 s->flags |= SEC_EXCLUDE; 8017 continue; 8018 } 8019 8020 if ((s->flags & SEC_HAS_CONTENTS) == 0) 8021 continue; 8022 8023 /* Allocate memory for the section contents. We use bfd_zalloc 8024 here in case unused entries are not reclaimed before the 8025 section's contents are written out. This should not happen, 8026 but this way if it does we get a R_PPC64_NONE reloc in .rela 8027 sections instead of garbage. 8028 We also rely on the section contents being zero when writing 8029 the GOT. */ 8030 s->contents = bfd_zalloc (dynobj, s->size); 8031 if (s->contents == NULL) 8032 return FALSE; 8033 } 8034 8035 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 8036 { 8037 if (!is_ppc64_elf_target (ibfd->xvec)) 8038 continue; 8039 8040 s = ppc64_elf_tdata (ibfd)->got; 8041 if (s != NULL && s != htab->got) 8042 { 8043 if (s->size == 0) 8044 s->flags |= SEC_EXCLUDE; 8045 else 8046 { 8047 s->contents = bfd_zalloc (ibfd, s->size); 8048 if (s->contents == NULL) 8049 return FALSE; 8050 } 8051 } 8052 s = ppc64_elf_tdata (ibfd)->relgot; 8053 if (s != NULL) 8054 { 8055 if (s->size == 0) 8056 s->flags |= SEC_EXCLUDE; 8057 else 8058 { 8059 s->contents = bfd_zalloc (ibfd, s->size); 8060 if (s->contents == NULL) 8061 return FALSE; 8062 relocs = TRUE; 8063 s->reloc_count = 0; 8064 } 8065 } 8066 } 8067 8068 if (htab->elf.dynamic_sections_created) 8069 { 8070 /* Add some entries to the .dynamic section. We fill in the 8071 values later, in ppc64_elf_finish_dynamic_sections, but we 8072 must add the entries now so that we get the correct size for 8073 the .dynamic section. The DT_DEBUG entry is filled in by the 8074 dynamic linker and used by the debugger. */ 8075#define add_dynamic_entry(TAG, VAL) \ 8076 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 8077 8078 if (info->executable) 8079 { 8080 if (!add_dynamic_entry (DT_DEBUG, 0)) 8081 return FALSE; 8082 } 8083 8084 if (htab->plt != NULL && htab->plt->size != 0) 8085 { 8086 if (!add_dynamic_entry (DT_PLTGOT, 0) 8087 || !add_dynamic_entry (DT_PLTRELSZ, 0) 8088 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 8089 || !add_dynamic_entry (DT_JMPREL, 0) 8090 || !add_dynamic_entry (DT_PPC64_GLINK, 0)) 8091 return FALSE; 8092 } 8093 8094 if (NO_OPD_RELOCS) 8095 { 8096 if (!add_dynamic_entry (DT_PPC64_OPD, 0) 8097 || !add_dynamic_entry (DT_PPC64_OPDSZ, 0)) 8098 return FALSE; 8099 } 8100 8101 if (relocs) 8102 { 8103 if (!add_dynamic_entry (DT_RELA, 0) 8104 || !add_dynamic_entry (DT_RELASZ, 0) 8105 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) 8106 return FALSE; 8107 8108 /* If any dynamic relocs apply to a read-only section, 8109 then we need a DT_TEXTREL entry. */ 8110 if ((info->flags & DF_TEXTREL) == 0) 8111 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info); 8112 8113 if ((info->flags & DF_TEXTREL) != 0) 8114 { 8115 if (!add_dynamic_entry (DT_TEXTREL, 0)) 8116 return FALSE; 8117 } 8118 } 8119 } 8120#undef add_dynamic_entry 8121 8122 return TRUE; 8123} 8124 8125/* Determine the type of stub needed, if any, for a call. */ 8126 8127static inline enum ppc_stub_type 8128ppc_type_of_stub (asection *input_sec, 8129 const Elf_Internal_Rela *rel, 8130 struct ppc_link_hash_entry **hash, 8131 bfd_vma destination) 8132{ 8133 struct ppc_link_hash_entry *h = *hash; 8134 bfd_vma location; 8135 bfd_vma branch_offset; 8136 bfd_vma max_branch_offset; 8137 enum elf_ppc64_reloc_type r_type; 8138 8139 if (h != NULL) 8140 { 8141 struct ppc_link_hash_entry *fdh = h; 8142 if (fdh->oh != NULL 8143 && fdh->oh->is_func_descriptor) 8144 fdh = fdh->oh; 8145 8146 if (fdh->elf.dynindx != -1) 8147 { 8148 struct plt_entry *ent; 8149 8150 for (ent = fdh->elf.plt.plist; ent != NULL; ent = ent->next) 8151 if (ent->addend == rel->r_addend 8152 && ent->plt.offset != (bfd_vma) -1) 8153 { 8154 *hash = fdh; 8155 return ppc_stub_plt_call; 8156 } 8157 } 8158 8159 /* Here, we know we don't have a plt entry. If we don't have a 8160 either a defined function descriptor or a defined entry symbol 8161 in a regular object file, then it is pointless trying to make 8162 any other type of stub. */ 8163 if (!((fdh->elf.root.type == bfd_link_hash_defined 8164 || fdh->elf.root.type == bfd_link_hash_defweak) 8165 && fdh->elf.root.u.def.section->output_section != NULL) 8166 && !((h->elf.root.type == bfd_link_hash_defined 8167 || h->elf.root.type == bfd_link_hash_defweak) 8168 && h->elf.root.u.def.section->output_section != NULL)) 8169 return ppc_stub_none; 8170 } 8171 8172 /* Determine where the call point is. */ 8173 location = (input_sec->output_offset 8174 + input_sec->output_section->vma 8175 + rel->r_offset); 8176 8177 branch_offset = destination - location; 8178 r_type = ELF64_R_TYPE (rel->r_info); 8179 8180 /* Determine if a long branch stub is needed. */ 8181 max_branch_offset = 1 << 25; 8182 if (r_type != R_PPC64_REL24) 8183 max_branch_offset = 1 << 15; 8184 8185 if (branch_offset + max_branch_offset >= 2 * max_branch_offset) 8186 /* We need a stub. Figure out whether a long_branch or plt_branch 8187 is needed later. */ 8188 return ppc_stub_long_branch; 8189 8190 return ppc_stub_none; 8191} 8192 8193/* Build a .plt call stub. */ 8194 8195static inline bfd_byte * 8196build_plt_stub (bfd *obfd, bfd_byte *p, int offset) 8197{ 8198#define PPC_LO(v) ((v) & 0xffff) 8199#define PPC_HI(v) (((v) >> 16) & 0xffff) 8200#define PPC_HA(v) PPC_HI ((v) + 0x8000) 8201 8202 if (PPC_HA (offset) != 0) 8203 { 8204 bfd_put_32 (obfd, ADDIS_R12_R2 | PPC_HA (offset), p), p += 4; 8205 bfd_put_32 (obfd, STD_R2_40R1, p), p += 4; 8206 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4; 8207 if (PPC_HA (offset + 16) != PPC_HA (offset)) 8208 { 8209 bfd_put_32 (obfd, ADDI_R12_R12 | PPC_LO (offset), p), p += 4; 8210 offset = 0; 8211 } 8212 bfd_put_32 (obfd, MTCTR_R11, p), p += 4; 8213 bfd_put_32 (obfd, LD_R2_0R12 | PPC_LO (offset + 8), p), p += 4; 8214 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset + 16), p), p += 4; 8215 bfd_put_32 (obfd, BCTR, p), p += 4; 8216 } 8217 else 8218 { 8219 bfd_put_32 (obfd, STD_R2_40R1, p), p += 4; 8220 bfd_put_32 (obfd, LD_R11_0R2 | PPC_LO (offset), p), p += 4; 8221 if (PPC_HA (offset + 16) != PPC_HA (offset)) 8222 { 8223 bfd_put_32 (obfd, ADDI_R2_R2 | PPC_LO (offset), p), p += 4; 8224 offset = 0; 8225 } 8226 bfd_put_32 (obfd, MTCTR_R11, p), p += 4; 8227 bfd_put_32 (obfd, LD_R11_0R2 | PPC_LO (offset + 16), p), p += 4; 8228 bfd_put_32 (obfd, LD_R2_0R2 | PPC_LO (offset + 8), p), p += 4; 8229 bfd_put_32 (obfd, BCTR, p), p += 4; 8230 } 8231 return p; 8232} 8233 8234static bfd_boolean 8235ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) 8236{ 8237 struct ppc_stub_hash_entry *stub_entry; 8238 struct ppc_branch_hash_entry *br_entry; 8239 struct bfd_link_info *info; 8240 struct ppc_link_hash_table *htab; 8241 bfd_byte *loc; 8242 bfd_byte *p; 8243 unsigned int indx; 8244 struct plt_entry *ent; 8245 bfd_vma dest, off; 8246 int size; 8247 8248 /* Massage our args to the form they really have. */ 8249 stub_entry = (struct ppc_stub_hash_entry *) gen_entry; 8250 info = in_arg; 8251 8252 htab = ppc_hash_table (info); 8253 8254 /* Make a note of the offset within the stubs for this entry. */ 8255 stub_entry->stub_offset = stub_entry->stub_sec->size; 8256 loc = stub_entry->stub_sec->contents + stub_entry->stub_offset; 8257 8258 htab->stub_count[stub_entry->stub_type - 1] += 1; 8259 switch (stub_entry->stub_type) 8260 { 8261 case ppc_stub_long_branch: 8262 case ppc_stub_long_branch_r2off: 8263 /* Branches are relative. This is where we are going to. */ 8264 off = dest = (stub_entry->target_value 8265 + stub_entry->target_section->output_offset 8266 + stub_entry->target_section->output_section->vma); 8267 8268 /* And this is where we are coming from. */ 8269 off -= (stub_entry->stub_offset 8270 + stub_entry->stub_sec->output_offset 8271 + stub_entry->stub_sec->output_section->vma); 8272 8273 size = 4; 8274 if (stub_entry->stub_type == ppc_stub_long_branch_r2off) 8275 { 8276 bfd_vma r2off; 8277 8278 r2off = (htab->stub_group[stub_entry->target_section->id].toc_off 8279 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8280 bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc); 8281 loc += 4; 8282 size = 12; 8283 if (PPC_HA (r2off) != 0) 8284 { 8285 size = 16; 8286 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc); 8287 loc += 4; 8288 } 8289 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc); 8290 loc += 4; 8291 off -= size - 4; 8292 } 8293 bfd_put_32 (htab->stub_bfd, B_DOT | (off & 0x3fffffc), loc); 8294 8295 if (off + (1 << 25) >= (bfd_vma) (1 << 26)) 8296 { 8297 (*_bfd_error_handler) (_("long branch stub `%s' offset overflow"), 8298 stub_entry->root.string); 8299 htab->stub_error = TRUE; 8300 return FALSE; 8301 } 8302 8303 if (info->emitrelocations) 8304 { 8305 Elf_Internal_Rela *relocs, *r; 8306 struct bfd_elf_section_data *elfsec_data; 8307 8308 elfsec_data = elf_section_data (stub_entry->stub_sec); 8309 relocs = elfsec_data->relocs; 8310 if (relocs == NULL) 8311 { 8312 bfd_size_type relsize; 8313 relsize = stub_entry->stub_sec->reloc_count * sizeof (*relocs); 8314 relocs = bfd_alloc (htab->stub_bfd, relsize); 8315 if (relocs == NULL) 8316 return FALSE; 8317 elfsec_data->relocs = relocs; 8318 elfsec_data->rel_hdr.sh_size = relsize; 8319 elfsec_data->rel_hdr.sh_entsize = 24; 8320 stub_entry->stub_sec->reloc_count = 0; 8321 } 8322 r = relocs + stub_entry->stub_sec->reloc_count; 8323 stub_entry->stub_sec->reloc_count += 1; 8324 r->r_offset = loc - stub_entry->stub_sec->contents; 8325 r->r_info = ELF64_R_INFO (0, R_PPC64_REL24); 8326 r->r_addend = dest; 8327 if (stub_entry->h != NULL) 8328 { 8329 struct elf_link_hash_entry **hashes; 8330 unsigned long symndx; 8331 struct ppc_link_hash_entry *h; 8332 8333 hashes = elf_sym_hashes (htab->stub_bfd); 8334 if (hashes == NULL) 8335 { 8336 bfd_size_type hsize; 8337 8338 hsize = (htab->stub_globals + 1) * sizeof (*hashes); 8339 hashes = bfd_zalloc (htab->stub_bfd, hsize); 8340 if (hashes == NULL) 8341 return FALSE; 8342 elf_sym_hashes (htab->stub_bfd) = hashes; 8343 htab->stub_globals = 1; 8344 } 8345 symndx = htab->stub_globals++; 8346 h = stub_entry->h; 8347 hashes[symndx] = &h->elf; 8348 r->r_info = ELF64_R_INFO (symndx, R_PPC64_REL24); 8349 if (h->oh != NULL && h->oh->is_func) 8350 h = h->oh; 8351 if (h->elf.root.u.def.section != stub_entry->target_section) 8352 /* H is an opd symbol. The addend must be zero. */ 8353 r->r_addend = 0; 8354 else 8355 { 8356 off = (h->elf.root.u.def.value 8357 + h->elf.root.u.def.section->output_offset 8358 + h->elf.root.u.def.section->output_section->vma); 8359 r->r_addend -= off; 8360 } 8361 } 8362 } 8363 break; 8364 8365 case ppc_stub_plt_branch: 8366 case ppc_stub_plt_branch_r2off: 8367 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table, 8368 stub_entry->root.string + 9, 8369 FALSE, FALSE); 8370 if (br_entry == NULL) 8371 { 8372 (*_bfd_error_handler) (_("can't find branch stub `%s'"), 8373 stub_entry->root.string); 8374 htab->stub_error = TRUE; 8375 return FALSE; 8376 } 8377 8378 off = (stub_entry->target_value 8379 + stub_entry->target_section->output_offset 8380 + stub_entry->target_section->output_section->vma); 8381 8382 bfd_put_64 (htab->brlt->owner, off, 8383 htab->brlt->contents + br_entry->offset); 8384 8385 if (htab->relbrlt != NULL) 8386 { 8387 /* Create a reloc for the branch lookup table entry. */ 8388 Elf_Internal_Rela rela; 8389 bfd_byte *rl; 8390 8391 rela.r_offset = (br_entry->offset 8392 + htab->brlt->output_offset 8393 + htab->brlt->output_section->vma); 8394 rela.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); 8395 rela.r_addend = off; 8396 8397 rl = htab->relbrlt->contents; 8398 rl += htab->relbrlt->reloc_count++ * sizeof (Elf64_External_Rela); 8399 bfd_elf64_swap_reloca_out (htab->relbrlt->owner, &rela, rl); 8400 } 8401 else if (info->emitrelocations) 8402 { 8403 Elf_Internal_Rela *relocs, *r; 8404 struct bfd_elf_section_data *elfsec_data; 8405 8406 elfsec_data = elf_section_data (htab->brlt); 8407 relocs = elfsec_data->relocs; 8408 if (relocs == NULL) 8409 { 8410 bfd_size_type relsize; 8411 relsize = htab->brlt->reloc_count * sizeof (*relocs); 8412 relocs = bfd_alloc (htab->brlt->owner, relsize); 8413 if (relocs == NULL) 8414 return FALSE; 8415 elfsec_data->relocs = relocs; 8416 elfsec_data->rel_hdr.sh_size = relsize; 8417 elfsec_data->rel_hdr.sh_entsize = 24; 8418 htab->brlt->reloc_count = 0; 8419 } 8420 r = relocs + htab->brlt->reloc_count; 8421 htab->brlt->reloc_count += 1; 8422 r->r_offset = (br_entry->offset 8423 + htab->brlt->output_offset 8424 + htab->brlt->output_section->vma); 8425 r->r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); 8426 r->r_addend = off; 8427 } 8428 8429 off = (br_entry->offset 8430 + htab->brlt->output_offset 8431 + htab->brlt->output_section->vma 8432 - elf_gp (htab->brlt->output_section->owner) 8433 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8434 8435 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0) 8436 { 8437 (*_bfd_error_handler) 8438 (_("linkage table error against `%s'"), 8439 stub_entry->root.string); 8440 bfd_set_error (bfd_error_bad_value); 8441 htab->stub_error = TRUE; 8442 return FALSE; 8443 } 8444 8445 indx = off; 8446 if (stub_entry->stub_type != ppc_stub_plt_branch_r2off) 8447 { 8448 if (PPC_HA (indx) != 0) 8449 { 8450 size = 16; 8451 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (indx), loc); 8452 loc += 4; 8453 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (indx), loc); 8454 } 8455 else 8456 { 8457 size = 12; 8458 bfd_put_32 (htab->stub_bfd, LD_R11_0R2 | PPC_LO (indx), loc); 8459 } 8460 } 8461 else 8462 { 8463 bfd_vma r2off; 8464 8465 r2off = (htab->stub_group[stub_entry->target_section->id].toc_off 8466 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8467 bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc); 8468 loc += 4; 8469 size = 20; 8470 if (PPC_HA (indx) != 0) 8471 { 8472 size += 4; 8473 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (indx), loc); 8474 loc += 4; 8475 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (indx), loc); 8476 loc += 4; 8477 } 8478 else 8479 { 8480 bfd_put_32 (htab->stub_bfd, LD_R11_0R2 | PPC_LO (indx), loc); 8481 loc += 4; 8482 } 8483 8484 if (PPC_HA (r2off) != 0) 8485 { 8486 size += 4; 8487 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc); 8488 loc += 4; 8489 } 8490 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc); 8491 } 8492 loc += 4; 8493 bfd_put_32 (htab->stub_bfd, MTCTR_R11, loc); 8494 loc += 4; 8495 bfd_put_32 (htab->stub_bfd, BCTR, loc); 8496 break; 8497 8498 case ppc_stub_plt_call: 8499 /* Do the best we can for shared libraries built without 8500 exporting ".foo" for each "foo". This can happen when symbol 8501 versioning scripts strip all bar a subset of symbols. */ 8502 if (stub_entry->h->oh != NULL 8503 && stub_entry->h->oh->elf.root.type != bfd_link_hash_defined 8504 && stub_entry->h->oh->elf.root.type != bfd_link_hash_defweak) 8505 { 8506 /* Point the symbol at the stub. There may be multiple stubs, 8507 we don't really care; The main thing is to make this sym 8508 defined somewhere. Maybe defining the symbol in the stub 8509 section is a silly idea. If we didn't do this, htab->top_id 8510 could disappear. */ 8511 stub_entry->h->oh->elf.root.type = bfd_link_hash_defined; 8512 stub_entry->h->oh->elf.root.u.def.section = stub_entry->stub_sec; 8513 stub_entry->h->oh->elf.root.u.def.value = stub_entry->stub_offset; 8514 } 8515 8516 /* Now build the stub. */ 8517 off = (bfd_vma) -1; 8518 for (ent = stub_entry->h->elf.plt.plist; ent != NULL; ent = ent->next) 8519 if (ent->addend == stub_entry->addend) 8520 { 8521 off = ent->plt.offset; 8522 break; 8523 } 8524 if (off >= (bfd_vma) -2) 8525 abort (); 8526 8527 off &= ~ (bfd_vma) 1; 8528 off += (htab->plt->output_offset 8529 + htab->plt->output_section->vma 8530 - elf_gp (htab->plt->output_section->owner) 8531 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8532 8533 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0) 8534 { 8535 (*_bfd_error_handler) 8536 (_("linkage table error against `%s'"), 8537 stub_entry->h->elf.root.root.string); 8538 bfd_set_error (bfd_error_bad_value); 8539 htab->stub_error = TRUE; 8540 return FALSE; 8541 } 8542 8543 p = build_plt_stub (htab->stub_bfd, loc, off); 8544 size = p - loc; 8545 break; 8546 8547 default: 8548 BFD_FAIL (); 8549 return FALSE; 8550 } 8551 8552 stub_entry->stub_sec->size += size; 8553 8554 if (htab->emit_stub_syms) 8555 { 8556 struct elf_link_hash_entry *h; 8557 size_t len1, len2; 8558 char *name; 8559 const char *const stub_str[] = { "long_branch", 8560 "long_branch_r2off", 8561 "plt_branch", 8562 "plt_branch_r2off", 8563 "plt_call" }; 8564 8565 len1 = strlen (stub_str[stub_entry->stub_type - 1]); 8566 len2 = strlen (stub_entry->root.string); 8567 name = bfd_malloc (len1 + len2 + 2); 8568 if (name == NULL) 8569 return FALSE; 8570 memcpy (name, stub_entry->root.string, 9); 8571 memcpy (name + 9, stub_str[stub_entry->stub_type - 1], len1); 8572 memcpy (name + len1 + 9, stub_entry->root.string + 8, len2 - 8 + 1); 8573 h = elf_link_hash_lookup (&htab->elf, name, TRUE, FALSE, FALSE); 8574 if (h == NULL) 8575 return FALSE; 8576 if (h->root.type == bfd_link_hash_new) 8577 { 8578 h->root.type = bfd_link_hash_defined; 8579 h->root.u.def.section = stub_entry->stub_sec; 8580 h->root.u.def.value = stub_entry->stub_offset; 8581 h->ref_regular = 1; 8582 h->def_regular = 1; 8583 h->ref_regular_nonweak = 1; 8584 h->forced_local = 1; 8585 h->non_elf = 0; 8586 } 8587 } 8588 8589 return TRUE; 8590} 8591 8592/* As above, but don't actually build the stub. Just bump offset so 8593 we know stub section sizes, and select plt_branch stubs where 8594 long_branch stubs won't do. */ 8595 8596static bfd_boolean 8597ppc_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) 8598{ 8599 struct ppc_stub_hash_entry *stub_entry; 8600 struct bfd_link_info *info; 8601 struct ppc_link_hash_table *htab; 8602 bfd_vma off; 8603 int size; 8604 8605 /* Massage our args to the form they really have. */ 8606 stub_entry = (struct ppc_stub_hash_entry *) gen_entry; 8607 info = in_arg; 8608 8609 htab = ppc_hash_table (info); 8610 8611 if (stub_entry->stub_type == ppc_stub_plt_call) 8612 { 8613 struct plt_entry *ent; 8614 off = (bfd_vma) -1; 8615 for (ent = stub_entry->h->elf.plt.plist; ent != NULL; ent = ent->next) 8616 if (ent->addend == stub_entry->addend) 8617 { 8618 off = ent->plt.offset & ~(bfd_vma) 1; 8619 break; 8620 } 8621 if (off >= (bfd_vma) -2) 8622 abort (); 8623 off += (htab->plt->output_offset 8624 + htab->plt->output_section->vma 8625 - elf_gp (htab->plt->output_section->owner) 8626 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8627 8628 size = PLT_CALL_STUB_SIZE; 8629 if (PPC_HA (off) == 0) 8630 size -= 4; 8631 if (PPC_HA (off + 16) != PPC_HA (off)) 8632 size += 4; 8633 } 8634 else 8635 { 8636 /* ppc_stub_long_branch or ppc_stub_plt_branch, or their r2off 8637 variants. */ 8638 bfd_vma r2off = 0; 8639 8640 off = (stub_entry->target_value 8641 + stub_entry->target_section->output_offset 8642 + stub_entry->target_section->output_section->vma); 8643 off -= (stub_entry->stub_sec->size 8644 + stub_entry->stub_sec->output_offset 8645 + stub_entry->stub_sec->output_section->vma); 8646 8647 /* Reset the stub type from the plt variant in case we now 8648 can reach with a shorter stub. */ 8649 if (stub_entry->stub_type >= ppc_stub_plt_branch) 8650 stub_entry->stub_type += ppc_stub_long_branch - ppc_stub_plt_branch; 8651 8652 size = 4; 8653 if (stub_entry->stub_type == ppc_stub_long_branch_r2off) 8654 { 8655 r2off = (htab->stub_group[stub_entry->target_section->id].toc_off 8656 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8657 size = 12; 8658 if (PPC_HA (r2off) != 0) 8659 size = 16; 8660 off -= size - 4; 8661 } 8662 8663 /* If the branch offset if too big, use a ppc_stub_plt_branch. */ 8664 if (off + (1 << 25) >= (bfd_vma) (1 << 26)) 8665 { 8666 struct ppc_branch_hash_entry *br_entry; 8667 unsigned int indx; 8668 8669 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table, 8670 stub_entry->root.string + 9, 8671 TRUE, FALSE); 8672 if (br_entry == NULL) 8673 { 8674 (*_bfd_error_handler) (_("can't build branch stub `%s'"), 8675 stub_entry->root.string); 8676 htab->stub_error = TRUE; 8677 return FALSE; 8678 } 8679 8680 if (br_entry->iter != htab->stub_iteration) 8681 { 8682 br_entry->iter = htab->stub_iteration; 8683 br_entry->offset = htab->brlt->size; 8684 htab->brlt->size += 8; 8685 8686 if (htab->relbrlt != NULL) 8687 htab->relbrlt->size += sizeof (Elf64_External_Rela); 8688 else if (info->emitrelocations) 8689 { 8690 htab->brlt->reloc_count += 1; 8691 htab->brlt->flags |= SEC_RELOC; 8692 } 8693 } 8694 8695 stub_entry->stub_type += ppc_stub_plt_branch - ppc_stub_long_branch; 8696 off = (br_entry->offset 8697 + htab->brlt->output_offset 8698 + htab->brlt->output_section->vma 8699 - elf_gp (htab->brlt->output_section->owner) 8700 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8701 8702 indx = off; 8703 if (stub_entry->stub_type != ppc_stub_plt_branch_r2off) 8704 { 8705 size = 12; 8706 if (PPC_HA (indx) != 0) 8707 size = 16; 8708 } 8709 else 8710 { 8711 size = 20; 8712 if (PPC_HA (indx) != 0) 8713 size += 4; 8714 8715 if (PPC_HA (r2off) != 0) 8716 size += 4; 8717 } 8718 } 8719 else if (info->emitrelocations) 8720 { 8721 stub_entry->stub_sec->reloc_count += 1; 8722 stub_entry->stub_sec->flags |= SEC_RELOC; 8723 } 8724 } 8725 8726 stub_entry->stub_sec->size += size; 8727 return TRUE; 8728} 8729 8730/* Set up various things so that we can make a list of input sections 8731 for each output section included in the link. Returns -1 on error, 8732 0 when no stubs will be needed, and 1 on success. */ 8733 8734int 8735ppc64_elf_setup_section_lists (bfd *output_bfd, 8736 struct bfd_link_info *info, 8737 int no_multi_toc) 8738{ 8739 bfd *input_bfd; 8740 int top_id, top_index, id; 8741 asection *section; 8742 asection **input_list; 8743 bfd_size_type amt; 8744 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8745 8746 htab->no_multi_toc = no_multi_toc; 8747 8748 if (htab->brlt == NULL) 8749 return 0; 8750 8751 /* Find the top input section id. */ 8752 for (input_bfd = info->input_bfds, top_id = 3; 8753 input_bfd != NULL; 8754 input_bfd = input_bfd->link_next) 8755 { 8756 for (section = input_bfd->sections; 8757 section != NULL; 8758 section = section->next) 8759 { 8760 if (top_id < section->id) 8761 top_id = section->id; 8762 } 8763 } 8764 8765 htab->top_id = top_id; 8766 amt = sizeof (struct map_stub) * (top_id + 1); 8767 htab->stub_group = bfd_zmalloc (amt); 8768 if (htab->stub_group == NULL) 8769 return -1; 8770 8771 /* Set toc_off for com, und, abs and ind sections. */ 8772 for (id = 0; id < 3; id++) 8773 htab->stub_group[id].toc_off = TOC_BASE_OFF; 8774 8775 elf_gp (output_bfd) = htab->toc_curr = ppc64_elf_toc (output_bfd); 8776 8777 /* We can't use output_bfd->section_count here to find the top output 8778 section index as some sections may have been removed, and 8779 strip_excluded_output_sections doesn't renumber the indices. */ 8780 for (section = output_bfd->sections, top_index = 0; 8781 section != NULL; 8782 section = section->next) 8783 { 8784 if (top_index < section->index) 8785 top_index = section->index; 8786 } 8787 8788 htab->top_index = top_index; 8789 amt = sizeof (asection *) * (top_index + 1); 8790 input_list = bfd_zmalloc (amt); 8791 htab->input_list = input_list; 8792 if (input_list == NULL) 8793 return -1; 8794 8795 return 1; 8796} 8797 8798/* The linker repeatedly calls this function for each TOC input section 8799 and linker generated GOT section. Group input bfds such that the toc 8800 within a group is less than 64k in size. Will break with cute linker 8801 scripts that play games with dot in the output toc section. */ 8802 8803void 8804ppc64_elf_next_toc_section (struct bfd_link_info *info, asection *isec) 8805{ 8806 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8807 8808 if (!htab->no_multi_toc) 8809 { 8810 bfd_vma addr = isec->output_offset + isec->output_section->vma; 8811 bfd_vma off = addr - htab->toc_curr; 8812 8813 if (off + isec->size > 0x10000) 8814 htab->toc_curr = addr; 8815 8816 elf_gp (isec->owner) = (htab->toc_curr 8817 - elf_gp (isec->output_section->owner) 8818 + TOC_BASE_OFF); 8819 } 8820} 8821 8822/* Called after the last call to the above function. */ 8823 8824void 8825ppc64_elf_reinit_toc (bfd *output_bfd, struct bfd_link_info *info) 8826{ 8827 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8828 8829 htab->multi_toc_needed = htab->toc_curr != elf_gp (output_bfd); 8830 8831 /* toc_curr tracks the TOC offset used for code sections below in 8832 ppc64_elf_next_input_section. Start off at 0x8000. */ 8833 htab->toc_curr = TOC_BASE_OFF; 8834} 8835 8836/* No toc references were found in ISEC. If the code in ISEC makes no 8837 calls, then there's no need to use toc adjusting stubs when branching 8838 into ISEC. Actually, indirect calls from ISEC are OK as they will 8839 load r2. Returns -1 on error, 0 for no stub needed, 1 for stub 8840 needed, and 2 if a cyclical call-graph was found but no other reason 8841 for a stub was detected. If called from the top level, a return of 8842 2 means the same as a return of 0. */ 8843 8844static int 8845toc_adjusting_stub_needed (struct bfd_link_info *info, asection *isec) 8846{ 8847 Elf_Internal_Rela *relstart, *rel; 8848 Elf_Internal_Sym *local_syms; 8849 int ret; 8850 struct ppc_link_hash_table *htab; 8851 8852 /* We know none of our code bearing sections will need toc stubs. */ 8853 if ((isec->flags & SEC_LINKER_CREATED) != 0) 8854 return 0; 8855 8856 if (isec->size == 0) 8857 return 0; 8858 8859 if (isec->output_section == NULL) 8860 return 0; 8861 8862 /* Hack for linux kernel. .fixup contains branches, but only back to 8863 the function that hit an exception. */ 8864 if (strcmp (isec->name, ".fixup") == 0) 8865 return 0; 8866 8867 if (isec->reloc_count == 0) 8868 return 0; 8869 8870 relstart = _bfd_elf_link_read_relocs (isec->owner, isec, NULL, NULL, 8871 info->keep_memory); 8872 if (relstart == NULL) 8873 return -1; 8874 8875 /* Look for branches to outside of this section. */ 8876 local_syms = NULL; 8877 ret = 0; 8878 htab = ppc_hash_table (info); 8879 for (rel = relstart; rel < relstart + isec->reloc_count; ++rel) 8880 { 8881 enum elf_ppc64_reloc_type r_type; 8882 unsigned long r_symndx; 8883 struct elf_link_hash_entry *h; 8884 Elf_Internal_Sym *sym; 8885 asection *sym_sec; 8886 long *opd_adjust; 8887 bfd_vma sym_value; 8888 bfd_vma dest; 8889 8890 r_type = ELF64_R_TYPE (rel->r_info); 8891 if (r_type != R_PPC64_REL24 8892 && r_type != R_PPC64_REL14 8893 && r_type != R_PPC64_REL14_BRTAKEN 8894 && r_type != R_PPC64_REL14_BRNTAKEN) 8895 continue; 8896 8897 r_symndx = ELF64_R_SYM (rel->r_info); 8898 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, r_symndx, 8899 isec->owner)) 8900 { 8901 ret = -1; 8902 break; 8903 } 8904 8905 /* Calls to dynamic lib functions go through a plt call stub 8906 that uses r2. Branches to undefined symbols might be a call 8907 using old-style dot symbols that can be satisfied by a plt 8908 call into a new-style dynamic library. */ 8909 if (sym_sec == NULL) 8910 { 8911 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) h; 8912 if (eh != NULL 8913 && eh->oh != NULL 8914 && eh->oh->elf.plt.plist != NULL) 8915 { 8916 ret = 1; 8917 break; 8918 } 8919 8920 /* Ignore other undefined symbols. */ 8921 continue; 8922 } 8923 8924 /* Assume branches to other sections not included in the link need 8925 stubs too, to cover -R and absolute syms. */ 8926 if (sym_sec->output_section == NULL) 8927 { 8928 ret = 1; 8929 break; 8930 } 8931 8932 if (h == NULL) 8933 sym_value = sym->st_value; 8934 else 8935 { 8936 if (h->root.type != bfd_link_hash_defined 8937 && h->root.type != bfd_link_hash_defweak) 8938 abort (); 8939 sym_value = h->root.u.def.value; 8940 } 8941 sym_value += rel->r_addend; 8942 8943 /* If this branch reloc uses an opd sym, find the code section. */ 8944 opd_adjust = get_opd_info (sym_sec); 8945 if (opd_adjust != NULL) 8946 { 8947 if (h == NULL) 8948 { 8949 long adjust; 8950 8951 adjust = opd_adjust[sym->st_value / 8]; 8952 if (adjust == -1) 8953 /* Assume deleted functions won't ever be called. */ 8954 continue; 8955 sym_value += adjust; 8956 } 8957 8958 dest = opd_entry_value (sym_sec, sym_value, &sym_sec, NULL); 8959 if (dest == (bfd_vma) -1) 8960 continue; 8961 } 8962 else 8963 dest = (sym_value 8964 + sym_sec->output_offset 8965 + sym_sec->output_section->vma); 8966 8967 /* Ignore branch to self. */ 8968 if (sym_sec == isec) 8969 continue; 8970 8971 /* If the called function uses the toc, we need a stub. */ 8972 if (sym_sec->has_toc_reloc 8973 || sym_sec->makes_toc_func_call) 8974 { 8975 ret = 1; 8976 break; 8977 } 8978 8979 /* Assume any branch that needs a long branch stub might in fact 8980 need a plt_branch stub. A plt_branch stub uses r2. */ 8981 else if (dest - (isec->output_offset 8982 + isec->output_section->vma 8983 + rel->r_offset) + (1 << 25) >= (2 << 25)) 8984 { 8985 ret = 1; 8986 break; 8987 } 8988 8989 /* If calling back to a section in the process of being tested, we 8990 can't say for sure that no toc adjusting stubs are needed, so 8991 don't return zero. */ 8992 else if (sym_sec->call_check_in_progress) 8993 ret = 2; 8994 8995 /* Branches to another section that itself doesn't have any TOC 8996 references are OK. Recursively call ourselves to check. */ 8997 else if (sym_sec->id <= htab->top_id 8998 && htab->stub_group[sym_sec->id].toc_off == 0) 8999 { 9000 int recur; 9001 9002 /* Mark current section as indeterminate, so that other 9003 sections that call back to current won't be marked as 9004 known. */ 9005 isec->call_check_in_progress = 1; 9006 recur = toc_adjusting_stub_needed (info, sym_sec); 9007 isec->call_check_in_progress = 0; 9008 9009 if (recur < 0) 9010 { 9011 /* An error. Exit. */ 9012 ret = -1; 9013 break; 9014 } 9015 else if (recur <= 1) 9016 { 9017 /* Known result. Mark as checked and set section flag. */ 9018 htab->stub_group[sym_sec->id].toc_off = 1; 9019 if (recur != 0) 9020 { 9021 sym_sec->makes_toc_func_call = 1; 9022 ret = 1; 9023 break; 9024 } 9025 } 9026 else 9027 { 9028 /* Unknown result. Continue checking. */ 9029 ret = 2; 9030 } 9031 } 9032 } 9033 9034 if (local_syms != NULL 9035 && (elf_tdata (isec->owner)->symtab_hdr.contents 9036 != (unsigned char *) local_syms)) 9037 free (local_syms); 9038 if (elf_section_data (isec)->relocs != relstart) 9039 free (relstart); 9040 9041 return ret; 9042} 9043 9044/* The linker repeatedly calls this function for each input section, 9045 in the order that input sections are linked into output sections. 9046 Build lists of input sections to determine groupings between which 9047 we may insert linker stubs. */ 9048 9049bfd_boolean 9050ppc64_elf_next_input_section (struct bfd_link_info *info, asection *isec) 9051{ 9052 struct ppc_link_hash_table *htab = ppc_hash_table (info); 9053 9054 if ((isec->output_section->flags & SEC_CODE) != 0 9055 && isec->output_section->index <= htab->top_index) 9056 { 9057 asection **list = htab->input_list + isec->output_section->index; 9058 /* Steal the link_sec pointer for our list. */ 9059#define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec) 9060 /* This happens to make the list in reverse order, 9061 which is what we want. */ 9062 PREV_SEC (isec) = *list; 9063 *list = isec; 9064 } 9065 9066 if (htab->multi_toc_needed) 9067 { 9068 /* If a code section has a function that uses the TOC then we need 9069 to use the right TOC (obviously). Also, make sure that .opd gets 9070 the correct TOC value for R_PPC64_TOC relocs that don't have or 9071 can't find their function symbol (shouldn't ever happen now). */ 9072 if (isec->has_toc_reloc || (isec->flags & SEC_CODE) == 0) 9073 { 9074 if (elf_gp (isec->owner) != 0) 9075 htab->toc_curr = elf_gp (isec->owner); 9076 } 9077 else if (htab->stub_group[isec->id].toc_off == 0) 9078 { 9079 int ret = toc_adjusting_stub_needed (info, isec); 9080 if (ret < 0) 9081 return FALSE; 9082 else 9083 isec->makes_toc_func_call = ret & 1; 9084 } 9085 } 9086 9087 /* Functions that don't use the TOC can belong in any TOC group. 9088 Use the last TOC base. This happens to make _init and _fini 9089 pasting work. */ 9090 htab->stub_group[isec->id].toc_off = htab->toc_curr; 9091 return TRUE; 9092} 9093 9094/* See whether we can group stub sections together. Grouping stub 9095 sections may result in fewer stubs. More importantly, we need to 9096 put all .init* and .fini* stubs at the beginning of the .init or 9097 .fini output sections respectively, because glibc splits the 9098 _init and _fini functions into multiple parts. Putting a stub in 9099 the middle of a function is not a good idea. */ 9100 9101static void 9102group_sections (struct ppc_link_hash_table *htab, 9103 bfd_size_type stub_group_size, 9104 bfd_boolean stubs_always_before_branch) 9105{ 9106 asection **list; 9107 bfd_size_type stub14_group_size; 9108 bfd_boolean suppress_size_errors; 9109 9110 suppress_size_errors = FALSE; 9111 stub14_group_size = stub_group_size; 9112 if (stub_group_size == 1) 9113 { 9114 /* Default values. */ 9115 if (stubs_always_before_branch) 9116 { 9117 stub_group_size = 0x1e00000; 9118 stub14_group_size = 0x7800; 9119 } 9120 else 9121 { 9122 stub_group_size = 0x1c00000; 9123 stub14_group_size = 0x7000; 9124 } 9125 suppress_size_errors = TRUE; 9126 } 9127 9128 list = htab->input_list + htab->top_index; 9129 do 9130 { 9131 asection *tail = *list; 9132 while (tail != NULL) 9133 { 9134 asection *curr; 9135 asection *prev; 9136 bfd_size_type total; 9137 bfd_boolean big_sec; 9138 bfd_vma curr_toc; 9139 9140 curr = tail; 9141 total = tail->size; 9142 big_sec = total > (ppc64_elf_section_data (tail)->has_14bit_branch 9143 ? stub14_group_size : stub_group_size); 9144 if (big_sec && !suppress_size_errors) 9145 (*_bfd_error_handler) (_("%B section %A exceeds stub group size"), 9146 tail->owner, tail); 9147 curr_toc = htab->stub_group[tail->id].toc_off; 9148 9149 while ((prev = PREV_SEC (curr)) != NULL 9150 && ((total += curr->output_offset - prev->output_offset) 9151 < (ppc64_elf_section_data (prev)->has_14bit_branch 9152 ? stub14_group_size : stub_group_size)) 9153 && htab->stub_group[prev->id].toc_off == curr_toc) 9154 curr = prev; 9155 9156 /* OK, the size from the start of CURR to the end is less 9157 than stub_group_size and thus can be handled by one stub 9158 section. (or the tail section is itself larger than 9159 stub_group_size, in which case we may be toast.) We 9160 should really be keeping track of the total size of stubs 9161 added here, as stubs contribute to the final output 9162 section size. That's a little tricky, and this way will 9163 only break if stubs added make the total size more than 9164 2^25, ie. for the default stub_group_size, if stubs total 9165 more than 2097152 bytes, or nearly 75000 plt call stubs. */ 9166 do 9167 { 9168 prev = PREV_SEC (tail); 9169 /* Set up this stub group. */ 9170 htab->stub_group[tail->id].link_sec = curr; 9171 } 9172 while (tail != curr && (tail = prev) != NULL); 9173 9174 /* But wait, there's more! Input sections up to stub_group_size 9175 bytes before the stub section can be handled by it too. 9176 Don't do this if we have a really large section after the 9177 stubs, as adding more stubs increases the chance that 9178 branches may not reach into the stub section. */ 9179 if (!stubs_always_before_branch && !big_sec) 9180 { 9181 total = 0; 9182 while (prev != NULL 9183 && ((total += tail->output_offset - prev->output_offset) 9184 < (ppc64_elf_section_data (prev)->has_14bit_branch 9185 ? stub14_group_size : stub_group_size)) 9186 && htab->stub_group[prev->id].toc_off == curr_toc) 9187 { 9188 tail = prev; 9189 prev = PREV_SEC (tail); 9190 htab->stub_group[tail->id].link_sec = curr; 9191 } 9192 } 9193 tail = prev; 9194 } 9195 } 9196 while (list-- != htab->input_list); 9197 free (htab->input_list); 9198#undef PREV_SEC 9199} 9200 9201/* Determine and set the size of the stub section for a final link. 9202 9203 The basic idea here is to examine all the relocations looking for 9204 PC-relative calls to a target that is unreachable with a "bl" 9205 instruction. */ 9206 9207bfd_boolean 9208ppc64_elf_size_stubs (bfd *output_bfd, 9209 struct bfd_link_info *info, 9210 bfd_signed_vma group_size, 9211 asection *(*add_stub_section) (const char *, asection *), 9212 void (*layout_sections_again) (void)) 9213{ 9214 bfd_size_type stub_group_size; 9215 bfd_boolean stubs_always_before_branch; 9216 struct ppc_link_hash_table *htab = ppc_hash_table (info); 9217 9218 /* Stash our params away. */ 9219 htab->add_stub_section = add_stub_section; 9220 htab->layout_sections_again = layout_sections_again; 9221 stubs_always_before_branch = group_size < 0; 9222 if (group_size < 0) 9223 stub_group_size = -group_size; 9224 else 9225 stub_group_size = group_size; 9226 9227 group_sections (htab, stub_group_size, stubs_always_before_branch); 9228 9229 while (1) 9230 { 9231 bfd *input_bfd; 9232 unsigned int bfd_indx; 9233 asection *stub_sec; 9234 9235 htab->stub_iteration += 1; 9236 9237 for (input_bfd = info->input_bfds, bfd_indx = 0; 9238 input_bfd != NULL; 9239 input_bfd = input_bfd->link_next, bfd_indx++) 9240 { 9241 Elf_Internal_Shdr *symtab_hdr; 9242 asection *section; 9243 Elf_Internal_Sym *local_syms = NULL; 9244 9245 if (!is_ppc64_elf_target (input_bfd->xvec)) 9246 continue; 9247 9248 /* We'll need the symbol table in a second. */ 9249 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 9250 if (symtab_hdr->sh_info == 0) 9251 continue; 9252 9253 /* Walk over each section attached to the input bfd. */ 9254 for (section = input_bfd->sections; 9255 section != NULL; 9256 section = section->next) 9257 { 9258 Elf_Internal_Rela *internal_relocs, *irelaend, *irela; 9259 9260 /* If there aren't any relocs, then there's nothing more 9261 to do. */ 9262 if ((section->flags & SEC_RELOC) == 0 9263 || (section->flags & SEC_ALLOC) == 0 9264 || (section->flags & SEC_LOAD) == 0 9265 || (section->flags & SEC_CODE) == 0 9266 || section->reloc_count == 0) 9267 continue; 9268 9269 /* If this section is a link-once section that will be 9270 discarded, then don't create any stubs. */ 9271 if (section->output_section == NULL 9272 || section->output_section->owner != output_bfd) 9273 continue; 9274 9275 /* Get the relocs. */ 9276 internal_relocs 9277 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, 9278 info->keep_memory); 9279 if (internal_relocs == NULL) 9280 goto error_ret_free_local; 9281 9282 /* Now examine each relocation. */ 9283 irela = internal_relocs; 9284 irelaend = irela + section->reloc_count; 9285 for (; irela < irelaend; irela++) 9286 { 9287 enum elf_ppc64_reloc_type r_type; 9288 unsigned int r_indx; 9289 enum ppc_stub_type stub_type; 9290 struct ppc_stub_hash_entry *stub_entry; 9291 asection *sym_sec, *code_sec; 9292 bfd_vma sym_value; 9293 bfd_vma destination; 9294 bfd_boolean ok_dest; 9295 struct ppc_link_hash_entry *hash; 9296 struct ppc_link_hash_entry *fdh; 9297 struct elf_link_hash_entry *h; 9298 Elf_Internal_Sym *sym; 9299 char *stub_name; 9300 const asection *id_sec; 9301 long *opd_adjust; 9302 9303 r_type = ELF64_R_TYPE (irela->r_info); 9304 r_indx = ELF64_R_SYM (irela->r_info); 9305 9306 if (r_type >= R_PPC64_max) 9307 { 9308 bfd_set_error (bfd_error_bad_value); 9309 goto error_ret_free_internal; 9310 } 9311 9312 /* Only look for stubs on branch instructions. */ 9313 if (r_type != R_PPC64_REL24 9314 && r_type != R_PPC64_REL14 9315 && r_type != R_PPC64_REL14_BRTAKEN 9316 && r_type != R_PPC64_REL14_BRNTAKEN) 9317 continue; 9318 9319 /* Now determine the call target, its name, value, 9320 section. */ 9321 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 9322 r_indx, input_bfd)) 9323 goto error_ret_free_internal; 9324 hash = (struct ppc_link_hash_entry *) h; 9325 9326 ok_dest = FALSE; 9327 fdh = NULL; 9328 sym_value = 0; 9329 if (hash == NULL) 9330 { 9331 sym_value = sym->st_value; 9332 ok_dest = TRUE; 9333 } 9334 else if (hash->elf.root.type == bfd_link_hash_defined 9335 || hash->elf.root.type == bfd_link_hash_defweak) 9336 { 9337 sym_value = hash->elf.root.u.def.value; 9338 if (sym_sec->output_section != NULL) 9339 ok_dest = TRUE; 9340 } 9341 else if (hash->elf.root.type == bfd_link_hash_undefweak 9342 || hash->elf.root.type == bfd_link_hash_undefined) 9343 { 9344 /* Recognise an old ABI func code entry sym, and 9345 use the func descriptor sym instead if it is 9346 defined. */ 9347 if (hash->elf.root.root.string[0] == '.' 9348 && (fdh = get_fdh (hash, htab)) != NULL) 9349 { 9350 if (fdh->elf.root.type == bfd_link_hash_defined 9351 || fdh->elf.root.type == bfd_link_hash_defweak) 9352 { 9353 sym_sec = fdh->elf.root.u.def.section; 9354 sym_value = fdh->elf.root.u.def.value; 9355 if (sym_sec->output_section != NULL) 9356 ok_dest = TRUE; 9357 } 9358 else 9359 fdh = NULL; 9360 } 9361 } 9362 else 9363 { 9364 bfd_set_error (bfd_error_bad_value); 9365 goto error_ret_free_internal; 9366 } 9367 9368 destination = 0; 9369 if (ok_dest) 9370 { 9371 sym_value += irela->r_addend; 9372 destination = (sym_value 9373 + sym_sec->output_offset 9374 + sym_sec->output_section->vma); 9375 } 9376 9377 code_sec = sym_sec; 9378 opd_adjust = get_opd_info (sym_sec); 9379 if (opd_adjust != NULL) 9380 { 9381 bfd_vma dest; 9382 9383 if (hash == NULL) 9384 { 9385 long adjust = opd_adjust[sym_value / 8]; 9386 if (adjust == -1) 9387 continue; 9388 sym_value += adjust; 9389 } 9390 dest = opd_entry_value (sym_sec, sym_value, 9391 &code_sec, &sym_value); 9392 if (dest != (bfd_vma) -1) 9393 { 9394 destination = dest; 9395 if (fdh != NULL) 9396 { 9397 /* Fixup old ABI sym to point at code 9398 entry. */ 9399 hash->elf.root.type = bfd_link_hash_defweak; 9400 hash->elf.root.u.def.section = code_sec; 9401 hash->elf.root.u.def.value = sym_value; 9402 } 9403 } 9404 } 9405 9406 /* Determine what (if any) linker stub is needed. */ 9407 stub_type = ppc_type_of_stub (section, irela, &hash, 9408 destination); 9409 9410 if (stub_type != ppc_stub_plt_call) 9411 { 9412 /* Check whether we need a TOC adjusting stub. 9413 Since the linker pastes together pieces from 9414 different object files when creating the 9415 _init and _fini functions, it may be that a 9416 call to what looks like a local sym is in 9417 fact a call needing a TOC adjustment. */ 9418 if (code_sec != NULL 9419 && code_sec->output_section != NULL 9420 && (htab->stub_group[code_sec->id].toc_off 9421 != htab->stub_group[section->id].toc_off) 9422 && (code_sec->has_toc_reloc 9423 || code_sec->makes_toc_func_call)) 9424 stub_type = ppc_stub_long_branch_r2off; 9425 } 9426 9427 if (stub_type == ppc_stub_none) 9428 continue; 9429 9430 /* __tls_get_addr calls might be eliminated. */ 9431 if (stub_type != ppc_stub_plt_call 9432 && hash != NULL 9433 && (hash == htab->tls_get_addr 9434 || hash == htab->tls_get_addr_fd) 9435 && section->has_tls_reloc 9436 && irela != internal_relocs) 9437 { 9438 /* Get tls info. */ 9439 char *tls_mask; 9440 9441 if (!get_tls_mask (&tls_mask, NULL, &local_syms, 9442 irela - 1, input_bfd)) 9443 goto error_ret_free_internal; 9444 if (*tls_mask != 0) 9445 continue; 9446 } 9447 9448 /* Support for grouping stub sections. */ 9449 id_sec = htab->stub_group[section->id].link_sec; 9450 9451 /* Get the name of this stub. */ 9452 stub_name = ppc_stub_name (id_sec, sym_sec, hash, irela); 9453 if (!stub_name) 9454 goto error_ret_free_internal; 9455 9456 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, 9457 stub_name, FALSE, FALSE); 9458 if (stub_entry != NULL) 9459 { 9460 /* The proper stub has already been created. */ 9461 free (stub_name); 9462 continue; 9463 } 9464 9465 stub_entry = ppc_add_stub (stub_name, section, htab); 9466 if (stub_entry == NULL) 9467 { 9468 free (stub_name); 9469 error_ret_free_internal: 9470 if (elf_section_data (section)->relocs == NULL) 9471 free (internal_relocs); 9472 error_ret_free_local: 9473 if (local_syms != NULL 9474 && (symtab_hdr->contents 9475 != (unsigned char *) local_syms)) 9476 free (local_syms); 9477 return FALSE; 9478 } 9479 9480 stub_entry->stub_type = stub_type; 9481 stub_entry->target_value = sym_value; 9482 stub_entry->target_section = code_sec; 9483 stub_entry->h = hash; 9484 stub_entry->addend = irela->r_addend; 9485 9486 if (stub_entry->h != NULL) 9487 htab->stub_globals += 1; 9488 } 9489 9490 /* We're done with the internal relocs, free them. */ 9491 if (elf_section_data (section)->relocs != internal_relocs) 9492 free (internal_relocs); 9493 } 9494 9495 if (local_syms != NULL 9496 && symtab_hdr->contents != (unsigned char *) local_syms) 9497 { 9498 if (!info->keep_memory) 9499 free (local_syms); 9500 else 9501 symtab_hdr->contents = (unsigned char *) local_syms; 9502 } 9503 } 9504 9505 /* We may have added some stubs. Find out the new size of the 9506 stub sections. */ 9507 for (stub_sec = htab->stub_bfd->sections; 9508 stub_sec != NULL; 9509 stub_sec = stub_sec->next) 9510 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 9511 { 9512 stub_sec->rawsize = stub_sec->size; 9513 stub_sec->size = 0; 9514 stub_sec->reloc_count = 0; 9515 stub_sec->flags &= ~SEC_RELOC; 9516 } 9517 9518 htab->brlt->size = 0; 9519 htab->brlt->reloc_count = 0; 9520 htab->brlt->flags &= ~SEC_RELOC; 9521 if (htab->relbrlt != NULL) 9522 htab->relbrlt->size = 0; 9523 9524 bfd_hash_traverse (&htab->stub_hash_table, ppc_size_one_stub, info); 9525 9526 for (stub_sec = htab->stub_bfd->sections; 9527 stub_sec != NULL; 9528 stub_sec = stub_sec->next) 9529 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0 9530 && stub_sec->rawsize != stub_sec->size) 9531 break; 9532 9533 /* Exit from this loop when no stubs have been added, and no stubs 9534 have changed size. */ 9535 if (stub_sec == NULL) 9536 break; 9537 9538 /* Ask the linker to do its stuff. */ 9539 (*htab->layout_sections_again) (); 9540 } 9541 9542 /* It would be nice to strip htab->brlt from the output if the 9543 section is empty, but it's too late. If we strip sections here, 9544 the dynamic symbol table is corrupted since the section symbol 9545 for the stripped section isn't written. */ 9546 9547 return TRUE; 9548} 9549 9550/* Called after we have determined section placement. If sections 9551 move, we'll be called again. Provide a value for TOCstart. */ 9552 9553bfd_vma 9554ppc64_elf_toc (bfd *obfd) 9555{ 9556 asection *s; 9557 bfd_vma TOCstart; 9558 9559 /* The TOC consists of sections .got, .toc, .tocbss, .plt in that 9560 order. The TOC starts where the first of these sections starts. */ 9561 s = bfd_get_section_by_name (obfd, ".got"); 9562 if (s == NULL) 9563 s = bfd_get_section_by_name (obfd, ".toc"); 9564 if (s == NULL) 9565 s = bfd_get_section_by_name (obfd, ".tocbss"); 9566 if (s == NULL) 9567 s = bfd_get_section_by_name (obfd, ".plt"); 9568 if (s == NULL) 9569 { 9570 /* This may happen for 9571 o references to TOC base (SYM@toc / TOC[tc0]) without a 9572 .toc directive 9573 o bad linker script 9574 o --gc-sections and empty TOC sections 9575 9576 FIXME: Warn user? */ 9577 9578 /* Look for a likely section. We probably won't even be 9579 using TOCstart. */ 9580 for (s = obfd->sections; s != NULL; s = s->next) 9581 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA | SEC_READONLY)) 9582 == (SEC_ALLOC | SEC_SMALL_DATA)) 9583 break; 9584 if (s == NULL) 9585 for (s = obfd->sections; s != NULL; s = s->next) 9586 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA)) 9587 == (SEC_ALLOC | SEC_SMALL_DATA)) 9588 break; 9589 if (s == NULL) 9590 for (s = obfd->sections; s != NULL; s = s->next) 9591 if ((s->flags & (SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC) 9592 break; 9593 if (s == NULL) 9594 for (s = obfd->sections; s != NULL; s = s->next) 9595 if ((s->flags & SEC_ALLOC) == SEC_ALLOC) 9596 break; 9597 } 9598 9599 TOCstart = 0; 9600 if (s != NULL) 9601 TOCstart = s->output_section->vma + s->output_offset; 9602 9603 return TOCstart; 9604} 9605 9606/* Build all the stubs associated with the current output file. 9607 The stubs are kept in a hash table attached to the main linker 9608 hash table. This function is called via gldelf64ppc_finish. */ 9609 9610bfd_boolean 9611ppc64_elf_build_stubs (bfd_boolean emit_stub_syms, 9612 struct bfd_link_info *info, 9613 char **stats) 9614{ 9615 struct ppc_link_hash_table *htab = ppc_hash_table (info); 9616 asection *stub_sec; 9617 bfd_byte *p; 9618 int stub_sec_count = 0; 9619 9620 htab->emit_stub_syms = emit_stub_syms; 9621 9622 /* Allocate memory to hold the linker stubs. */ 9623 for (stub_sec = htab->stub_bfd->sections; 9624 stub_sec != NULL; 9625 stub_sec = stub_sec->next) 9626 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0 9627 && stub_sec->size != 0) 9628 { 9629 stub_sec->contents = bfd_zalloc (htab->stub_bfd, stub_sec->size); 9630 if (stub_sec->contents == NULL) 9631 return FALSE; 9632 /* We want to check that built size is the same as calculated 9633 size. rawsize is a convenient location to use. */ 9634 stub_sec->rawsize = stub_sec->size; 9635 stub_sec->size = 0; 9636 } 9637 9638 if (htab->glink != NULL && htab->glink->size != 0) 9639 { 9640 unsigned int indx; 9641 bfd_vma plt0; 9642 9643 /* Build the .glink plt call stub. */ 9644 if (htab->emit_stub_syms) 9645 { 9646 struct elf_link_hash_entry *h; 9647 h = elf_link_hash_lookup (&htab->elf, "__glink", TRUE, FALSE, FALSE); 9648 if (h == NULL) 9649 return FALSE; 9650 if (h->root.type == bfd_link_hash_new) 9651 { 9652 h->root.type = bfd_link_hash_defined; 9653 h->root.u.def.section = htab->glink; 9654 h->root.u.def.value = 8; 9655 h->ref_regular = 1; 9656 h->def_regular = 1; 9657 h->ref_regular_nonweak = 1; 9658 h->forced_local = 1; 9659 h->non_elf = 0; 9660 } 9661 } 9662 p = htab->glink->contents; 9663 plt0 = (htab->plt->output_section->vma 9664 + htab->plt->output_offset 9665 - (htab->glink->output_section->vma 9666 + htab->glink->output_offset 9667 + 16)); 9668 bfd_put_64 (htab->glink->owner, plt0, p); 9669 p += 8; 9670 bfd_put_32 (htab->glink->owner, MFLR_R12, p); 9671 p += 4; 9672 bfd_put_32 (htab->glink->owner, BCL_20_31, p); 9673 p += 4; 9674 bfd_put_32 (htab->glink->owner, MFLR_R11, p); 9675 p += 4; 9676 bfd_put_32 (htab->glink->owner, LD_R2_M16R11, p); 9677 p += 4; 9678 bfd_put_32 (htab->glink->owner, MTLR_R12, p); 9679 p += 4; 9680 bfd_put_32 (htab->glink->owner, ADD_R12_R2_R11, p); 9681 p += 4; 9682 bfd_put_32 (htab->glink->owner, LD_R11_0R12, p); 9683 p += 4; 9684 bfd_put_32 (htab->glink->owner, LD_R2_0R12 | 8, p); 9685 p += 4; 9686 bfd_put_32 (htab->glink->owner, MTCTR_R11, p); 9687 p += 4; 9688 bfd_put_32 (htab->glink->owner, LD_R11_0R12 | 16, p); 9689 p += 4; 9690 bfd_put_32 (htab->glink->owner, BCTR, p); 9691 p += 4; 9692 while (p - htab->glink->contents < GLINK_CALL_STUB_SIZE) 9693 { 9694 bfd_put_32 (htab->glink->owner, NOP, p); 9695 p += 4; 9696 } 9697 9698 /* Build the .glink lazy link call stubs. */ 9699 indx = 0; 9700 while (p < htab->glink->contents + htab->glink->size) 9701 { 9702 if (indx < 0x8000) 9703 { 9704 bfd_put_32 (htab->glink->owner, LI_R0_0 | indx, p); 9705 p += 4; 9706 } 9707 else 9708 { 9709 bfd_put_32 (htab->glink->owner, LIS_R0_0 | PPC_HI (indx), p); 9710 p += 4; 9711 bfd_put_32 (htab->glink->owner, ORI_R0_R0_0 | PPC_LO (indx), p); 9712 p += 4; 9713 } 9714 bfd_put_32 (htab->glink->owner, 9715 B_DOT | ((htab->glink->contents - p + 8) & 0x3fffffc), p); 9716 indx++; 9717 p += 4; 9718 } 9719 htab->glink->rawsize = p - htab->glink->contents; 9720 } 9721 9722 if (htab->brlt->size != 0) 9723 { 9724 htab->brlt->contents = bfd_zalloc (htab->brlt->owner, 9725 htab->brlt->size); 9726 if (htab->brlt->contents == NULL) 9727 return FALSE; 9728 } 9729 if (htab->relbrlt != NULL && htab->relbrlt->size != 0) 9730 { 9731 htab->relbrlt->contents = bfd_zalloc (htab->relbrlt->owner, 9732 htab->relbrlt->size); 9733 if (htab->relbrlt->contents == NULL) 9734 return FALSE; 9735 } 9736 9737 /* Build the stubs as directed by the stub hash table. */ 9738 bfd_hash_traverse (&htab->stub_hash_table, ppc_build_one_stub, info); 9739 9740 if (htab->relbrlt != NULL) 9741 htab->relbrlt->reloc_count = 0; 9742 9743 for (stub_sec = htab->stub_bfd->sections; 9744 stub_sec != NULL; 9745 stub_sec = stub_sec->next) 9746 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 9747 { 9748 stub_sec_count += 1; 9749 if (stub_sec->rawsize != stub_sec->size) 9750 break; 9751 } 9752 9753 if (stub_sec != NULL 9754 || htab->glink->rawsize != htab->glink->size) 9755 { 9756 htab->stub_error = TRUE; 9757 (*_bfd_error_handler) (_("stubs don't match calculated size")); 9758 } 9759 9760 if (htab->stub_error) 9761 return FALSE; 9762 9763 if (stats != NULL) 9764 { 9765 *stats = bfd_malloc (500); 9766 if (*stats == NULL) 9767 return FALSE; 9768 9769 sprintf (*stats, _("linker stubs in %u group%s\n" 9770 " branch %lu\n" 9771 " toc adjust %lu\n" 9772 " long branch %lu\n" 9773 " long toc adj %lu\n" 9774 " plt call %lu"), 9775 stub_sec_count, 9776 stub_sec_count == 1 ? "" : "s", 9777 htab->stub_count[ppc_stub_long_branch - 1], 9778 htab->stub_count[ppc_stub_long_branch_r2off - 1], 9779 htab->stub_count[ppc_stub_plt_branch - 1], 9780 htab->stub_count[ppc_stub_plt_branch_r2off - 1], 9781 htab->stub_count[ppc_stub_plt_call - 1]); 9782 } 9783 return TRUE; 9784} 9785 9786/* This function undoes the changes made by add_symbol_adjust. */ 9787 9788static bfd_boolean 9789undo_symbol_twiddle (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED) 9790{ 9791 struct ppc_link_hash_entry *eh; 9792 9793 if (h->root.type == bfd_link_hash_indirect) 9794 return TRUE; 9795 9796 if (h->root.type == bfd_link_hash_warning) 9797 h = (struct elf_link_hash_entry *) h->root.u.i.link; 9798 9799 eh = (struct ppc_link_hash_entry *) h; 9800 if (eh->elf.root.type != bfd_link_hash_undefweak || !eh->was_undefined) 9801 return TRUE; 9802 9803 eh->elf.root.type = bfd_link_hash_undefined; 9804 return TRUE; 9805} 9806 9807void 9808ppc64_elf_restore_symbols (struct bfd_link_info *info) 9809{ 9810 struct ppc_link_hash_table *htab = ppc_hash_table (info); 9811 elf_link_hash_traverse (&htab->elf, undo_symbol_twiddle, info); 9812} 9813 9814/* What to do when ld finds relocations against symbols defined in 9815 discarded sections. */ 9816 9817static unsigned int 9818ppc64_elf_action_discarded (asection *sec) 9819{ 9820 if (strcmp (".opd", sec->name) == 0) 9821 return 0; 9822 9823 if (strcmp (".toc", sec->name) == 0) 9824 return 0; 9825 9826 if (strcmp (".toc1", sec->name) == 0) 9827 return 0; 9828 9829 return _bfd_elf_default_action_discarded (sec); 9830} 9831 9832/* The RELOCATE_SECTION function is called by the ELF backend linker 9833 to handle the relocations for a section. 9834 9835 The relocs are always passed as Rela structures; if the section 9836 actually uses Rel structures, the r_addend field will always be 9837 zero. 9838 9839 This function is responsible for adjust the section contents as 9840 necessary, and (if using Rela relocs and generating a 9841 relocatable output file) adjusting the reloc addend as 9842 necessary. 9843 9844 This function does not have to worry about setting the reloc 9845 address or the reloc symbol index. 9846 9847 LOCAL_SYMS is a pointer to the swapped in local symbols. 9848 9849 LOCAL_SECTIONS is an array giving the section in the input file 9850 corresponding to the st_shndx field of each local symbol. 9851 9852 The global hash table entry for the global symbols can be found 9853 via elf_sym_hashes (input_bfd). 9854 9855 When generating relocatable output, this function must handle 9856 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 9857 going to be the section symbol corresponding to the output 9858 section, which means that the addend must be adjusted 9859 accordingly. */ 9860 9861static bfd_boolean 9862ppc64_elf_relocate_section (bfd *output_bfd, 9863 struct bfd_link_info *info, 9864 bfd *input_bfd, 9865 asection *input_section, 9866 bfd_byte *contents, 9867 Elf_Internal_Rela *relocs, 9868 Elf_Internal_Sym *local_syms, 9869 asection **local_sections) 9870{ 9871 struct ppc_link_hash_table *htab; 9872 Elf_Internal_Shdr *symtab_hdr; 9873 struct elf_link_hash_entry **sym_hashes; 9874 Elf_Internal_Rela *rel; 9875 Elf_Internal_Rela *relend; 9876 Elf_Internal_Rela outrel; 9877 bfd_byte *loc; 9878 struct got_entry **local_got_ents; 9879 bfd_vma TOCstart; 9880 bfd_boolean ret = TRUE; 9881 bfd_boolean is_opd; 9882 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */ 9883 bfd_boolean is_power4 = FALSE; 9884 bfd_vma d_offset = (bfd_big_endian (output_bfd) ? 2 : 0); 9885 9886 /* Initialize howto table if needed. */ 9887 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 9888 ppc_howto_init (); 9889 9890 htab = ppc_hash_table (info); 9891 9892 /* Don't relocate stub sections. */ 9893 if (input_section->owner == htab->stub_bfd) 9894 return TRUE; 9895 9896 local_got_ents = elf_local_got_ents (input_bfd); 9897 TOCstart = elf_gp (output_bfd); 9898 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 9899 sym_hashes = elf_sym_hashes (input_bfd); 9900 is_opd = ppc64_elf_section_data (input_section)->sec_type == sec_opd; 9901 9902 rel = relocs; 9903 relend = relocs + input_section->reloc_count; 9904 for (; rel < relend; rel++) 9905 { 9906 enum elf_ppc64_reloc_type r_type; 9907 bfd_vma addend, orig_addend; 9908 bfd_reloc_status_type r; 9909 Elf_Internal_Sym *sym; 9910 asection *sec; 9911 struct elf_link_hash_entry *h_elf; 9912 struct ppc_link_hash_entry *h; 9913 struct ppc_link_hash_entry *fdh; 9914 const char *sym_name; 9915 unsigned long r_symndx, toc_symndx; 9916 char tls_mask, tls_gd, tls_type; 9917 char sym_type; 9918 bfd_vma relocation; 9919 bfd_boolean unresolved_reloc; 9920 bfd_boolean warned; 9921 unsigned long insn, mask; 9922 struct ppc_stub_hash_entry *stub_entry; 9923 bfd_vma max_br_offset; 9924 bfd_vma from; 9925 9926 r_type = ELF64_R_TYPE (rel->r_info); 9927 r_symndx = ELF64_R_SYM (rel->r_info); 9928 9929 /* For old style R_PPC64_TOC relocs with a zero symbol, use the 9930 symbol of the previous ADDR64 reloc. The symbol gives us the 9931 proper TOC base to use. */ 9932 if (rel->r_info == ELF64_R_INFO (0, R_PPC64_TOC) 9933 && rel != relocs 9934 && ELF64_R_TYPE (rel[-1].r_info) == R_PPC64_ADDR64 9935 && is_opd) 9936 r_symndx = ELF64_R_SYM (rel[-1].r_info); 9937 9938 sym = NULL; 9939 sec = NULL; 9940 h_elf = NULL; 9941 sym_name = NULL; 9942 unresolved_reloc = FALSE; 9943 warned = FALSE; 9944 orig_addend = rel->r_addend; 9945 9946 if (r_symndx < symtab_hdr->sh_info) 9947 { 9948 /* It's a local symbol. */ 9949 long *opd_adjust; 9950 9951 sym = local_syms + r_symndx; 9952 sec = local_sections[r_symndx]; 9953 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, sec); 9954 sym_type = ELF64_ST_TYPE (sym->st_info); 9955 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 9956 opd_adjust = get_opd_info (sec); 9957 if (opd_adjust != NULL) 9958 { 9959 long adjust = opd_adjust[(sym->st_value + rel->r_addend) / 8]; 9960 if (adjust == -1) 9961 relocation = 0; 9962 else 9963 { 9964 /* If this is a relocation against the opd section sym 9965 and we have edited .opd, adjust the reloc addend so 9966 that ld -r and ld --emit-relocs output is correct. 9967 If it is a reloc against some other .opd symbol, 9968 then the symbol value will be adjusted later. */ 9969 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) 9970 rel->r_addend += adjust; 9971 else 9972 relocation += adjust; 9973 } 9974 } 9975 } 9976 else 9977 { 9978 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 9979 r_symndx, symtab_hdr, sym_hashes, 9980 h_elf, sec, relocation, 9981 unresolved_reloc, warned); 9982 sym_name = h_elf->root.root.string; 9983 sym_type = h_elf->type; 9984 } 9985 h = (struct ppc_link_hash_entry *) h_elf; 9986 9987 if (sec != NULL && elf_discarded_section (sec)) 9988 { 9989 /* For relocs against symbols from removed linkonce sections, 9990 or sections discarded by a linker script, we just want the 9991 section contents zeroed. Avoid any special processing. */ 9992 _bfd_clear_contents (ppc64_elf_howto_table[r_type], input_bfd, 9993 contents + rel->r_offset); 9994 rel->r_info = 0; 9995 rel->r_addend = 0; 9996 continue; 9997 } 9998 9999 if (info->relocatable) 10000 continue; 10001 10002 /* TLS optimizations. Replace instruction sequences and relocs 10003 based on information we collected in tls_optimize. We edit 10004 RELOCS so that --emit-relocs will output something sensible 10005 for the final instruction stream. */ 10006 tls_mask = 0; 10007 tls_gd = 0; 10008 toc_symndx = 0; 10009 if (IS_PPC64_TLS_RELOC (r_type)) 10010 { 10011 if (h != NULL) 10012 tls_mask = h->tls_mask; 10013 else if (local_got_ents != NULL) 10014 { 10015 char *lgot_masks; 10016 lgot_masks = (char *) (local_got_ents + symtab_hdr->sh_info); 10017 tls_mask = lgot_masks[r_symndx]; 10018 } 10019 if (tls_mask == 0 && r_type == R_PPC64_TLS) 10020 { 10021 /* Check for toc tls entries. */ 10022 char *toc_tls; 10023 10024 if (!get_tls_mask (&toc_tls, &toc_symndx, &local_syms, 10025 rel, input_bfd)) 10026 return FALSE; 10027 10028 if (toc_tls) 10029 tls_mask = *toc_tls; 10030 } 10031 } 10032 10033 /* Check that tls relocs are used with tls syms, and non-tls 10034 relocs are used with non-tls syms. */ 10035 if (r_symndx != 0 10036 && r_type != R_PPC64_NONE 10037 && (h == NULL 10038 || h->elf.root.type == bfd_link_hash_defined 10039 || h->elf.root.type == bfd_link_hash_defweak) 10040 && IS_PPC64_TLS_RELOC (r_type) != (sym_type == STT_TLS)) 10041 { 10042 if (r_type == R_PPC64_TLS && tls_mask != 0) 10043 /* R_PPC64_TLS is OK against a symbol in the TOC. */ 10044 ; 10045 else 10046 (*_bfd_error_handler) 10047 (sym_type == STT_TLS 10048 ? _("%B(%A+0x%lx): %s used with TLS symbol %s") 10049 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s"), 10050 input_bfd, 10051 input_section, 10052 (long) rel->r_offset, 10053 ppc64_elf_howto_table[r_type]->name, 10054 sym_name); 10055 } 10056 10057 /* Ensure reloc mapping code below stays sane. */ 10058 if (R_PPC64_TOC16_LO_DS != R_PPC64_TOC16_DS + 1 10059 || R_PPC64_TOC16_LO != R_PPC64_TOC16 + 1 10060 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TLSGD16 & 3) 10061 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TLSGD16_LO & 3) 10062 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TLSGD16_HI & 3) 10063 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TLSGD16_HA & 3) 10064 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TPREL16_DS & 3) 10065 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TPREL16_LO_DS & 3) 10066 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TPREL16_HI & 3) 10067 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TPREL16_HA & 3)) 10068 abort (); 10069 10070 switch (r_type) 10071 { 10072 default: 10073 break; 10074 10075 case R_PPC64_TOC16: 10076 case R_PPC64_TOC16_LO: 10077 case R_PPC64_TOC16_DS: 10078 case R_PPC64_TOC16_LO_DS: 10079 { 10080 /* Check for toc tls entries. */ 10081 char *toc_tls; 10082 int retval; 10083 10084 retval = get_tls_mask (&toc_tls, &toc_symndx, &local_syms, 10085 rel, input_bfd); 10086 if (retval == 0) 10087 return FALSE; 10088 10089 if (toc_tls) 10090 { 10091 tls_mask = *toc_tls; 10092 if (r_type == R_PPC64_TOC16_DS 10093 || r_type == R_PPC64_TOC16_LO_DS) 10094 { 10095 if (tls_mask != 0 10096 && (tls_mask & (TLS_DTPREL | TLS_TPREL)) == 0) 10097 goto toctprel; 10098 } 10099 else 10100 { 10101 /* If we found a GD reloc pair, then we might be 10102 doing a GD->IE transition. */ 10103 if (retval == 2) 10104 { 10105 tls_gd = TLS_TPRELGD; 10106 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 10107 goto tls_get_addr_check; 10108 } 10109 else if (retval == 3) 10110 { 10111 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 10112 goto tls_get_addr_check; 10113 } 10114 } 10115 } 10116 } 10117 break; 10118 10119 case R_PPC64_GOT_TPREL16_DS: 10120 case R_PPC64_GOT_TPREL16_LO_DS: 10121 if (tls_mask != 0 10122 && (tls_mask & TLS_TPREL) == 0) 10123 { 10124 toctprel: 10125 insn = bfd_get_32 (output_bfd, contents + rel->r_offset - d_offset); 10126 insn &= 31 << 21; 10127 insn |= 0x3c0d0000; /* addis 0,13,0 */ 10128 bfd_put_32 (output_bfd, insn, contents + rel->r_offset - d_offset); 10129 r_type = R_PPC64_TPREL16_HA; 10130 if (toc_symndx != 0) 10131 { 10132 rel->r_info = ELF64_R_INFO (toc_symndx, r_type); 10133 /* We changed the symbol. Start over in order to 10134 get h, sym, sec etc. right. */ 10135 rel--; 10136 continue; 10137 } 10138 else 10139 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10140 } 10141 break; 10142 10143 case R_PPC64_TLS: 10144 if (tls_mask != 0 10145 && (tls_mask & TLS_TPREL) == 0) 10146 { 10147 bfd_vma rtra; 10148 insn = bfd_get_32 (output_bfd, contents + rel->r_offset); 10149 if ((insn & ((0x3f << 26) | (31 << 11))) 10150 == ((31 << 26) | (13 << 11))) 10151 rtra = insn & ((1 << 26) - (1 << 16)); 10152 else if ((insn & ((0x3f << 26) | (31 << 16))) 10153 == ((31 << 26) | (13 << 16))) 10154 rtra = (insn & (31 << 21)) | ((insn & (31 << 11)) << 5); 10155 else 10156 abort (); 10157 if ((insn & ((1 << 11) - (1 << 1))) == 266 << 1) 10158 /* add -> addi. */ 10159 insn = 14 << 26; 10160 else if ((insn & (31 << 1)) == 23 << 1 10161 && ((insn & (31 << 6)) < 14 << 6 10162 || ((insn & (31 << 6)) >= 16 << 6 10163 && (insn & (31 << 6)) < 24 << 6))) 10164 /* load and store indexed -> dform. */ 10165 insn = (32 | ((insn >> 6) & 31)) << 26; 10166 else if ((insn & (31 << 1)) == 21 << 1 10167 && (insn & (0x1a << 6)) == 0) 10168 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */ 10169 insn = (((58 | ((insn >> 6) & 4)) << 26) 10170 | ((insn >> 6) & 1)); 10171 else if ((insn & (31 << 1)) == 21 << 1 10172 && (insn & ((1 << 11) - (1 << 1))) == 341 << 1) 10173 /* lwax -> lwa. */ 10174 insn = (58 << 26) | 2; 10175 else 10176 abort (); 10177 insn |= rtra; 10178 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 10179 /* Was PPC64_TLS which sits on insn boundary, now 10180 PPC64_TPREL16_LO which is at low-order half-word. */ 10181 rel->r_offset += d_offset; 10182 r_type = R_PPC64_TPREL16_LO; 10183 if (toc_symndx != 0) 10184 { 10185 rel->r_info = ELF64_R_INFO (toc_symndx, r_type); 10186 /* We changed the symbol. Start over in order to 10187 get h, sym, sec etc. right. */ 10188 rel--; 10189 continue; 10190 } 10191 else 10192 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10193 } 10194 break; 10195 10196 case R_PPC64_GOT_TLSGD16_HI: 10197 case R_PPC64_GOT_TLSGD16_HA: 10198 tls_gd = TLS_TPRELGD; 10199 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 10200 goto tls_gdld_hi; 10201 break; 10202 10203 case R_PPC64_GOT_TLSLD16_HI: 10204 case R_PPC64_GOT_TLSLD16_HA: 10205 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 10206 { 10207 tls_gdld_hi: 10208 if ((tls_mask & tls_gd) != 0) 10209 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3) 10210 + R_PPC64_GOT_TPREL16_DS); 10211 else 10212 { 10213 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset); 10214 rel->r_offset -= d_offset; 10215 r_type = R_PPC64_NONE; 10216 } 10217 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10218 } 10219 break; 10220 10221 case R_PPC64_GOT_TLSGD16: 10222 case R_PPC64_GOT_TLSGD16_LO: 10223 tls_gd = TLS_TPRELGD; 10224 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 10225 goto tls_get_addr_check; 10226 break; 10227 10228 case R_PPC64_GOT_TLSLD16: 10229 case R_PPC64_GOT_TLSLD16_LO: 10230 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 10231 { 10232 tls_get_addr_check: 10233 if (rel + 1 < relend) 10234 { 10235 enum elf_ppc64_reloc_type r_type2; 10236 unsigned long r_symndx2; 10237 struct elf_link_hash_entry *h2; 10238 bfd_vma insn1, insn2, insn3; 10239 bfd_vma offset; 10240 10241 /* The next instruction should be a call to 10242 __tls_get_addr. Peek at the reloc to be sure. */ 10243 r_type2 = ELF64_R_TYPE (rel[1].r_info); 10244 r_symndx2 = ELF64_R_SYM (rel[1].r_info); 10245 if (r_symndx2 < symtab_hdr->sh_info 10246 || (r_type2 != R_PPC64_REL14 10247 && r_type2 != R_PPC64_REL14_BRTAKEN 10248 && r_type2 != R_PPC64_REL14_BRNTAKEN 10249 && r_type2 != R_PPC64_REL24)) 10250 break; 10251 10252 h2 = sym_hashes[r_symndx2 - symtab_hdr->sh_info]; 10253 while (h2->root.type == bfd_link_hash_indirect 10254 || h2->root.type == bfd_link_hash_warning) 10255 h2 = (struct elf_link_hash_entry *) h2->root.u.i.link; 10256 if (h2 == NULL || (h2 != &htab->tls_get_addr->elf 10257 && h2 != &htab->tls_get_addr_fd->elf)) 10258 break; 10259 10260 /* OK, it checks out. Replace the call. */ 10261 offset = rel[1].r_offset; 10262 insn1 = bfd_get_32 (output_bfd, 10263 contents + rel->r_offset - d_offset); 10264 insn3 = bfd_get_32 (output_bfd, 10265 contents + offset + 4); 10266 if ((tls_mask & tls_gd) != 0) 10267 { 10268 /* IE */ 10269 insn1 &= (1 << 26) - (1 << 2); 10270 insn1 |= 58 << 26; /* ld */ 10271 insn2 = 0x7c636a14; /* add 3,3,13 */ 10272 rel[1].r_info = ELF64_R_INFO (r_symndx2, R_PPC64_NONE); 10273 if ((tls_mask & TLS_EXPLICIT) == 0) 10274 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3) 10275 + R_PPC64_GOT_TPREL16_DS); 10276 else 10277 r_type += R_PPC64_TOC16_DS - R_PPC64_TOC16; 10278 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10279 } 10280 else 10281 { 10282 /* LE */ 10283 insn1 = 0x3c6d0000; /* addis 3,13,0 */ 10284 insn2 = 0x38630000; /* addi 3,3,0 */ 10285 if (tls_gd == 0) 10286 { 10287 /* Was an LD reloc. */ 10288 r_symndx = 0; 10289 rel->r_addend = htab->elf.tls_sec->vma + DTP_OFFSET; 10290 rel[1].r_addend = htab->elf.tls_sec->vma + DTP_OFFSET; 10291 } 10292 else if (toc_symndx != 0) 10293 r_symndx = toc_symndx; 10294 r_type = R_PPC64_TPREL16_HA; 10295 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10296 rel[1].r_info = ELF64_R_INFO (r_symndx, 10297 R_PPC64_TPREL16_LO); 10298 rel[1].r_offset += d_offset; 10299 } 10300 if (insn3 == NOP 10301 || insn3 == CROR_151515 || insn3 == CROR_313131) 10302 { 10303 insn3 = insn2; 10304 insn2 = NOP; 10305 rel[1].r_offset += 4; 10306 } 10307 bfd_put_32 (output_bfd, insn1, contents + rel->r_offset - d_offset); 10308 bfd_put_32 (output_bfd, insn2, contents + offset); 10309 bfd_put_32 (output_bfd, insn3, contents + offset + 4); 10310 if (tls_gd == 0 || toc_symndx != 0) 10311 { 10312 /* We changed the symbol. Start over in order 10313 to get h, sym, sec etc. right. */ 10314 rel--; 10315 continue; 10316 } 10317 } 10318 } 10319 break; 10320 10321 case R_PPC64_DTPMOD64: 10322 if (rel + 1 < relend 10323 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64) 10324 && rel[1].r_offset == rel->r_offset + 8) 10325 { 10326 if ((tls_mask & TLS_GD) == 0) 10327 { 10328 rel[1].r_info = ELF64_R_INFO (r_symndx, R_PPC64_NONE); 10329 if ((tls_mask & TLS_TPRELGD) != 0) 10330 r_type = R_PPC64_TPREL64; 10331 else 10332 { 10333 bfd_put_64 (output_bfd, 1, contents + rel->r_offset); 10334 r_type = R_PPC64_NONE; 10335 } 10336 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10337 } 10338 } 10339 else 10340 { 10341 if ((tls_mask & TLS_LD) == 0) 10342 { 10343 bfd_put_64 (output_bfd, 1, contents + rel->r_offset); 10344 r_type = R_PPC64_NONE; 10345 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10346 } 10347 } 10348 break; 10349 10350 case R_PPC64_TPREL64: 10351 if ((tls_mask & TLS_TPREL) == 0) 10352 { 10353 r_type = R_PPC64_NONE; 10354 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10355 } 10356 break; 10357 } 10358 10359 /* Handle other relocations that tweak non-addend part of insn. */ 10360 insn = 0; 10361 max_br_offset = 1 << 25; 10362 addend = rel->r_addend; 10363 switch (r_type) 10364 { 10365 default: 10366 break; 10367 10368 /* Branch taken prediction relocations. */ 10369 case R_PPC64_ADDR14_BRTAKEN: 10370 case R_PPC64_REL14_BRTAKEN: 10371 insn = 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */ 10372 /* Fall thru. */ 10373 10374 /* Branch not taken prediction relocations. */ 10375 case R_PPC64_ADDR14_BRNTAKEN: 10376 case R_PPC64_REL14_BRNTAKEN: 10377 insn |= bfd_get_32 (output_bfd, 10378 contents + rel->r_offset) & ~(0x01 << 21); 10379 /* Fall thru. */ 10380 10381 case R_PPC64_REL14: 10382 max_br_offset = 1 << 15; 10383 /* Fall thru. */ 10384 10385 case R_PPC64_REL24: 10386 /* Calls to functions with a different TOC, such as calls to 10387 shared objects, need to alter the TOC pointer. This is 10388 done using a linkage stub. A REL24 branching to these 10389 linkage stubs needs to be followed by a nop, as the nop 10390 will be replaced with an instruction to restore the TOC 10391 base pointer. */ 10392 stub_entry = NULL; 10393 fdh = h; 10394 if (((h != NULL 10395 && (((fdh = h->oh) != NULL 10396 && fdh->elf.plt.plist != NULL) 10397 || (fdh = h)->elf.plt.plist != NULL)) 10398 || (sec != NULL 10399 && sec->output_section != NULL 10400 && sec->id <= htab->top_id 10401 && (htab->stub_group[sec->id].toc_off 10402 != htab->stub_group[input_section->id].toc_off))) 10403 && (stub_entry = ppc_get_stub_entry (input_section, sec, fdh, 10404 rel, htab)) != NULL 10405 && (stub_entry->stub_type == ppc_stub_plt_call 10406 || stub_entry->stub_type == ppc_stub_plt_branch_r2off 10407 || stub_entry->stub_type == ppc_stub_long_branch_r2off)) 10408 { 10409 bfd_boolean can_plt_call = FALSE; 10410 10411 if (rel->r_offset + 8 <= input_section->size) 10412 { 10413 unsigned long nop; 10414 nop = bfd_get_32 (input_bfd, contents + rel->r_offset + 4); 10415 if (nop == NOP 10416 || nop == CROR_151515 || nop == CROR_313131) 10417 { 10418 bfd_put_32 (input_bfd, LD_R2_40R1, 10419 contents + rel->r_offset + 4); 10420 can_plt_call = TRUE; 10421 } 10422 } 10423 10424 if (!can_plt_call) 10425 { 10426 if (stub_entry->stub_type == ppc_stub_plt_call) 10427 { 10428 /* If this is a plain branch rather than a branch 10429 and link, don't require a nop. However, don't 10430 allow tail calls in a shared library as they 10431 will result in r2 being corrupted. */ 10432 unsigned long br; 10433 br = bfd_get_32 (input_bfd, contents + rel->r_offset); 10434 if (info->executable && (br & 1) == 0) 10435 can_plt_call = TRUE; 10436 else 10437 stub_entry = NULL; 10438 } 10439 else if (h != NULL 10440 && strcmp (h->elf.root.root.string, 10441 ".__libc_start_main") == 0) 10442 { 10443 /* Allow crt1 branch to go via a toc adjusting stub. */ 10444 can_plt_call = TRUE; 10445 } 10446 else 10447 { 10448 if (strcmp (input_section->output_section->name, 10449 ".init") == 0 10450 || strcmp (input_section->output_section->name, 10451 ".fini") == 0) 10452 (*_bfd_error_handler) 10453 (_("%B(%A+0x%lx): automatic multiple TOCs " 10454 "not supported using your crt files; " 10455 "recompile with -mminimal-toc or upgrade gcc"), 10456 input_bfd, 10457 input_section, 10458 (long) rel->r_offset); 10459 else 10460 (*_bfd_error_handler) 10461 (_("%B(%A+0x%lx): sibling call optimization to `%s' " 10462 "does not allow automatic multiple TOCs; " 10463 "recompile with -mminimal-toc or " 10464 "-fno-optimize-sibling-calls, " 10465 "or make `%s' extern"), 10466 input_bfd, 10467 input_section, 10468 (long) rel->r_offset, 10469 sym_name, 10470 sym_name); 10471 bfd_set_error (bfd_error_bad_value); 10472 ret = FALSE; 10473 } 10474 } 10475 10476 if (can_plt_call 10477 && stub_entry->stub_type == ppc_stub_plt_call) 10478 unresolved_reloc = FALSE; 10479 } 10480 10481 if (stub_entry == NULL 10482 && get_opd_info (sec) != NULL) 10483 { 10484 /* The branch destination is the value of the opd entry. */ 10485 bfd_vma off = (relocation + addend 10486 - sec->output_section->vma 10487 - sec->output_offset); 10488 bfd_vma dest = opd_entry_value (sec, off, NULL, NULL); 10489 if (dest != (bfd_vma) -1) 10490 { 10491 relocation = dest; 10492 addend = 0; 10493 } 10494 } 10495 10496 /* If the branch is out of reach we ought to have a long 10497 branch stub. */ 10498 from = (rel->r_offset 10499 + input_section->output_offset 10500 + input_section->output_section->vma); 10501 10502 if (stub_entry == NULL 10503 && (relocation + addend - from + max_br_offset 10504 >= 2 * max_br_offset) 10505 && r_type != R_PPC64_ADDR14_BRTAKEN 10506 && r_type != R_PPC64_ADDR14_BRNTAKEN) 10507 stub_entry = ppc_get_stub_entry (input_section, sec, h, rel, 10508 htab); 10509 10510 if (stub_entry != NULL) 10511 { 10512 /* Munge up the value and addend so that we call the stub 10513 rather than the procedure directly. */ 10514 relocation = (stub_entry->stub_offset 10515 + stub_entry->stub_sec->output_offset 10516 + stub_entry->stub_sec->output_section->vma); 10517 addend = 0; 10518 } 10519 10520 if (insn != 0) 10521 { 10522 if (is_power4) 10523 { 10524 /* Set 'a' bit. This is 0b00010 in BO field for branch 10525 on CR(BI) insns (BO == 001at or 011at), and 0b01000 10526 for branch on CTR insns (BO == 1a00t or 1a01t). */ 10527 if ((insn & (0x14 << 21)) == (0x04 << 21)) 10528 insn |= 0x02 << 21; 10529 else if ((insn & (0x14 << 21)) == (0x10 << 21)) 10530 insn |= 0x08 << 21; 10531 else 10532 break; 10533 } 10534 else 10535 { 10536 /* Invert 'y' bit if not the default. */ 10537 if ((bfd_signed_vma) (relocation + addend - from) < 0) 10538 insn ^= 0x01 << 21; 10539 } 10540 10541 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 10542 } 10543 10544 /* NOP out calls to undefined weak functions. 10545 We can thus call a weak function without first 10546 checking whether the function is defined. */ 10547 else if (h != NULL 10548 && h->elf.root.type == bfd_link_hash_undefweak 10549 && r_type == R_PPC64_REL24 10550 && relocation == 0 10551 && addend == 0) 10552 { 10553 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset); 10554 continue; 10555 } 10556 break; 10557 } 10558 10559 /* Set `addend'. */ 10560 tls_type = 0; 10561 switch (r_type) 10562 { 10563 default: 10564 (*_bfd_error_handler) 10565 (_("%B: unknown relocation type %d for symbol %s"), 10566 input_bfd, (int) r_type, sym_name); 10567 10568 bfd_set_error (bfd_error_bad_value); 10569 ret = FALSE; 10570 continue; 10571 10572 case R_PPC64_NONE: 10573 case R_PPC64_TLS: 10574 case R_PPC64_GNU_VTINHERIT: 10575 case R_PPC64_GNU_VTENTRY: 10576 continue; 10577 10578 /* GOT16 relocations. Like an ADDR16 using the symbol's 10579 address in the GOT as relocation value instead of the 10580 symbol's value itself. Also, create a GOT entry for the 10581 symbol and put the symbol value there. */ 10582 case R_PPC64_GOT_TLSGD16: 10583 case R_PPC64_GOT_TLSGD16_LO: 10584 case R_PPC64_GOT_TLSGD16_HI: 10585 case R_PPC64_GOT_TLSGD16_HA: 10586 tls_type = TLS_TLS | TLS_GD; 10587 goto dogot; 10588 10589 case R_PPC64_GOT_TLSLD16: 10590 case R_PPC64_GOT_TLSLD16_LO: 10591 case R_PPC64_GOT_TLSLD16_HI: 10592 case R_PPC64_GOT_TLSLD16_HA: 10593 tls_type = TLS_TLS | TLS_LD; 10594 goto dogot; 10595 10596 case R_PPC64_GOT_TPREL16_DS: 10597 case R_PPC64_GOT_TPREL16_LO_DS: 10598 case R_PPC64_GOT_TPREL16_HI: 10599 case R_PPC64_GOT_TPREL16_HA: 10600 tls_type = TLS_TLS | TLS_TPREL; 10601 goto dogot; 10602 10603 case R_PPC64_GOT_DTPREL16_DS: 10604 case R_PPC64_GOT_DTPREL16_LO_DS: 10605 case R_PPC64_GOT_DTPREL16_HI: 10606 case R_PPC64_GOT_DTPREL16_HA: 10607 tls_type = TLS_TLS | TLS_DTPREL; 10608 goto dogot; 10609 10610 case R_PPC64_GOT16: 10611 case R_PPC64_GOT16_LO: 10612 case R_PPC64_GOT16_HI: 10613 case R_PPC64_GOT16_HA: 10614 case R_PPC64_GOT16_DS: 10615 case R_PPC64_GOT16_LO_DS: 10616 dogot: 10617 { 10618 /* Relocation is to the entry for this symbol in the global 10619 offset table. */ 10620 asection *got; 10621 bfd_vma *offp; 10622 bfd_vma off; 10623 unsigned long indx = 0; 10624 10625 if (tls_type == (TLS_TLS | TLS_LD) 10626 && (h == NULL 10627 || !h->elf.def_dynamic)) 10628 offp = &ppc64_tlsld_got (input_bfd)->offset; 10629 else 10630 { 10631 struct got_entry *ent; 10632 10633 if (h != NULL) 10634 { 10635 bfd_boolean dyn = htab->elf.dynamic_sections_created; 10636 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, 10637 &h->elf) 10638 || (info->shared 10639 && SYMBOL_REFERENCES_LOCAL (info, &h->elf))) 10640 /* This is actually a static link, or it is a 10641 -Bsymbolic link and the symbol is defined 10642 locally, or the symbol was forced to be local 10643 because of a version file. */ 10644 ; 10645 else 10646 { 10647 indx = h->elf.dynindx; 10648 unresolved_reloc = FALSE; 10649 } 10650 ent = h->elf.got.glist; 10651 } 10652 else 10653 { 10654 if (local_got_ents == NULL) 10655 abort (); 10656 ent = local_got_ents[r_symndx]; 10657 } 10658 10659 for (; ent != NULL; ent = ent->next) 10660 if (ent->addend == orig_addend 10661 && ent->owner == input_bfd 10662 && ent->tls_type == tls_type) 10663 break; 10664 if (ent == NULL) 10665 abort (); 10666 offp = &ent->got.offset; 10667 } 10668 10669 got = ppc64_elf_tdata (input_bfd)->got; 10670 if (got == NULL) 10671 abort (); 10672 10673 /* The offset must always be a multiple of 8. We use the 10674 least significant bit to record whether we have already 10675 processed this entry. */ 10676 off = *offp; 10677 if ((off & 1) != 0) 10678 off &= ~1; 10679 else 10680 { 10681 /* Generate relocs for the dynamic linker, except in 10682 the case of TLSLD where we'll use one entry per 10683 module. */ 10684 asection *relgot = ppc64_elf_tdata (input_bfd)->relgot; 10685 10686 *offp = off | 1; 10687 if ((info->shared || indx != 0) 10688 && (h == NULL 10689 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT 10690 || h->elf.root.type != bfd_link_hash_undefweak)) 10691 { 10692 outrel.r_offset = (got->output_section->vma 10693 + got->output_offset 10694 + off); 10695 outrel.r_addend = addend; 10696 if (tls_type & (TLS_LD | TLS_GD)) 10697 { 10698 outrel.r_addend = 0; 10699 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPMOD64); 10700 if (tls_type == (TLS_TLS | TLS_GD)) 10701 { 10702 loc = relgot->contents; 10703 loc += (relgot->reloc_count++ 10704 * sizeof (Elf64_External_Rela)); 10705 bfd_elf64_swap_reloca_out (output_bfd, 10706 &outrel, loc); 10707 outrel.r_offset += 8; 10708 outrel.r_addend = addend; 10709 outrel.r_info 10710 = ELF64_R_INFO (indx, R_PPC64_DTPREL64); 10711 } 10712 } 10713 else if (tls_type == (TLS_TLS | TLS_DTPREL)) 10714 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPREL64); 10715 else if (tls_type == (TLS_TLS | TLS_TPREL)) 10716 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_TPREL64); 10717 else if (indx == 0) 10718 { 10719 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_RELATIVE); 10720 10721 /* Write the .got section contents for the sake 10722 of prelink. */ 10723 loc = got->contents + off; 10724 bfd_put_64 (output_bfd, outrel.r_addend + relocation, 10725 loc); 10726 } 10727 else 10728 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_GLOB_DAT); 10729 10730 if (indx == 0 && tls_type != (TLS_TLS | TLS_LD)) 10731 { 10732 outrel.r_addend += relocation; 10733 if (tls_type & (TLS_GD | TLS_DTPREL | TLS_TPREL)) 10734 outrel.r_addend -= htab->elf.tls_sec->vma; 10735 } 10736 loc = relgot->contents; 10737 loc += (relgot->reloc_count++ 10738 * sizeof (Elf64_External_Rela)); 10739 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 10740 } 10741 10742 /* Init the .got section contents here if we're not 10743 emitting a reloc. */ 10744 else 10745 { 10746 relocation += addend; 10747 if (tls_type == (TLS_TLS | TLS_LD)) 10748 relocation = 1; 10749 else if (tls_type != 0) 10750 { 10751 relocation -= htab->elf.tls_sec->vma + DTP_OFFSET; 10752 if (tls_type == (TLS_TLS | TLS_TPREL)) 10753 relocation += DTP_OFFSET - TP_OFFSET; 10754 10755 if (tls_type == (TLS_TLS | TLS_GD)) 10756 { 10757 bfd_put_64 (output_bfd, relocation, 10758 got->contents + off + 8); 10759 relocation = 1; 10760 } 10761 } 10762 10763 bfd_put_64 (output_bfd, relocation, 10764 got->contents + off); 10765 } 10766 } 10767 10768 if (off >= (bfd_vma) -2) 10769 abort (); 10770 10771 relocation = got->output_offset + off; 10772 10773 /* TOC base (r2) is TOC start plus 0x8000. */ 10774 addend = -TOC_BASE_OFF; 10775 } 10776 break; 10777 10778 case R_PPC64_PLT16_HA: 10779 case R_PPC64_PLT16_HI: 10780 case R_PPC64_PLT16_LO: 10781 case R_PPC64_PLT32: 10782 case R_PPC64_PLT64: 10783 /* Relocation is to the entry for this symbol in the 10784 procedure linkage table. */ 10785 10786 /* Resolve a PLT reloc against a local symbol directly, 10787 without using the procedure linkage table. */ 10788 if (h == NULL) 10789 break; 10790 10791 /* It's possible that we didn't make a PLT entry for this 10792 symbol. This happens when statically linking PIC code, 10793 or when using -Bsymbolic. Go find a match if there is a 10794 PLT entry. */ 10795 if (htab->plt != NULL) 10796 { 10797 struct plt_entry *ent; 10798 for (ent = h->elf.plt.plist; ent != NULL; ent = ent->next) 10799 if (ent->addend == orig_addend 10800 && ent->plt.offset != (bfd_vma) -1) 10801 { 10802 relocation = (htab->plt->output_section->vma 10803 + htab->plt->output_offset 10804 + ent->plt.offset); 10805 unresolved_reloc = FALSE; 10806 } 10807 } 10808 break; 10809 10810 case R_PPC64_TOC: 10811 /* Relocation value is TOC base. */ 10812 relocation = TOCstart; 10813 if (r_symndx == 0) 10814 relocation += htab->stub_group[input_section->id].toc_off; 10815 else if (unresolved_reloc) 10816 ; 10817 else if (sec != NULL && sec->id <= htab->top_id) 10818 relocation += htab->stub_group[sec->id].toc_off; 10819 else 10820 unresolved_reloc = TRUE; 10821 goto dodyn; 10822 10823 /* TOC16 relocs. We want the offset relative to the TOC base, 10824 which is the address of the start of the TOC plus 0x8000. 10825 The TOC consists of sections .got, .toc, .tocbss, and .plt, 10826 in this order. */ 10827 case R_PPC64_TOC16: 10828 case R_PPC64_TOC16_LO: 10829 case R_PPC64_TOC16_HI: 10830 case R_PPC64_TOC16_DS: 10831 case R_PPC64_TOC16_LO_DS: 10832 case R_PPC64_TOC16_HA: 10833 addend -= TOCstart + htab->stub_group[input_section->id].toc_off; 10834 break; 10835 10836 /* Relocate against the beginning of the section. */ 10837 case R_PPC64_SECTOFF: 10838 case R_PPC64_SECTOFF_LO: 10839 case R_PPC64_SECTOFF_HI: 10840 case R_PPC64_SECTOFF_DS: 10841 case R_PPC64_SECTOFF_LO_DS: 10842 case R_PPC64_SECTOFF_HA: 10843 if (sec != NULL) 10844 addend -= sec->output_section->vma; 10845 break; 10846 10847 case R_PPC64_REL14: 10848 case R_PPC64_REL14_BRNTAKEN: 10849 case R_PPC64_REL14_BRTAKEN: 10850 case R_PPC64_REL24: 10851 break; 10852 10853 case R_PPC64_TPREL16: 10854 case R_PPC64_TPREL16_LO: 10855 case R_PPC64_TPREL16_HI: 10856 case R_PPC64_TPREL16_HA: 10857 case R_PPC64_TPREL16_DS: 10858 case R_PPC64_TPREL16_LO_DS: 10859 case R_PPC64_TPREL16_HIGHER: 10860 case R_PPC64_TPREL16_HIGHERA: 10861 case R_PPC64_TPREL16_HIGHEST: 10862 case R_PPC64_TPREL16_HIGHESTA: 10863 addend -= htab->elf.tls_sec->vma + TP_OFFSET; 10864 if (info->shared) 10865 /* The TPREL16 relocs shouldn't really be used in shared 10866 libs as they will result in DT_TEXTREL being set, but 10867 support them anyway. */ 10868 goto dodyn; 10869 break; 10870 10871 case R_PPC64_DTPREL16: 10872 case R_PPC64_DTPREL16_LO: 10873 case R_PPC64_DTPREL16_HI: 10874 case R_PPC64_DTPREL16_HA: 10875 case R_PPC64_DTPREL16_DS: 10876 case R_PPC64_DTPREL16_LO_DS: 10877 case R_PPC64_DTPREL16_HIGHER: 10878 case R_PPC64_DTPREL16_HIGHERA: 10879 case R_PPC64_DTPREL16_HIGHEST: 10880 case R_PPC64_DTPREL16_HIGHESTA: 10881 addend -= htab->elf.tls_sec->vma + DTP_OFFSET; 10882 break; 10883 10884 case R_PPC64_DTPMOD64: 10885 relocation = 1; 10886 addend = 0; 10887 goto dodyn; 10888 10889 case R_PPC64_TPREL64: 10890 addend -= htab->elf.tls_sec->vma + TP_OFFSET; 10891 goto dodyn; 10892 10893 case R_PPC64_DTPREL64: 10894 addend -= htab->elf.tls_sec->vma + DTP_OFFSET; 10895 /* Fall thru */ 10896 10897 /* Relocations that may need to be propagated if this is a 10898 dynamic object. */ 10899 case R_PPC64_REL30: 10900 case R_PPC64_REL32: 10901 case R_PPC64_REL64: 10902 case R_PPC64_ADDR14: 10903 case R_PPC64_ADDR14_BRNTAKEN: 10904 case R_PPC64_ADDR14_BRTAKEN: 10905 case R_PPC64_ADDR16: 10906 case R_PPC64_ADDR16_DS: 10907 case R_PPC64_ADDR16_HA: 10908 case R_PPC64_ADDR16_HI: 10909 case R_PPC64_ADDR16_HIGHER: 10910 case R_PPC64_ADDR16_HIGHERA: 10911 case R_PPC64_ADDR16_HIGHEST: 10912 case R_PPC64_ADDR16_HIGHESTA: 10913 case R_PPC64_ADDR16_LO: 10914 case R_PPC64_ADDR16_LO_DS: 10915 case R_PPC64_ADDR24: 10916 case R_PPC64_ADDR32: 10917 case R_PPC64_ADDR64: 10918 case R_PPC64_UADDR16: 10919 case R_PPC64_UADDR32: 10920 case R_PPC64_UADDR64: 10921 dodyn: 10922 if ((input_section->flags & SEC_ALLOC) == 0) 10923 break; 10924 10925 if (NO_OPD_RELOCS && is_opd) 10926 break; 10927 10928 if ((info->shared 10929 && (h == NULL 10930 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT 10931 || h->elf.root.type != bfd_link_hash_undefweak) 10932 && (MUST_BE_DYN_RELOC (r_type) 10933 || !SYMBOL_CALLS_LOCAL (info, &h->elf))) 10934 || (ELIMINATE_COPY_RELOCS 10935 && !info->shared 10936 && h != NULL 10937 && h->elf.dynindx != -1 10938 && !h->elf.non_got_ref 10939 && h->elf.def_dynamic 10940 && !h->elf.def_regular)) 10941 { 10942 Elf_Internal_Rela outrel; 10943 bfd_boolean skip, relocate; 10944 asection *sreloc; 10945 bfd_byte *loc; 10946 bfd_vma out_off; 10947 10948 /* When generating a dynamic object, these relocations 10949 are copied into the output file to be resolved at run 10950 time. */ 10951 10952 skip = FALSE; 10953 relocate = FALSE; 10954 10955 out_off = _bfd_elf_section_offset (output_bfd, info, 10956 input_section, rel->r_offset); 10957 if (out_off == (bfd_vma) -1) 10958 skip = TRUE; 10959 else if (out_off == (bfd_vma) -2) 10960 skip = TRUE, relocate = TRUE; 10961 out_off += (input_section->output_section->vma 10962 + input_section->output_offset); 10963 outrel.r_offset = out_off; 10964 outrel.r_addend = rel->r_addend; 10965 10966 /* Optimize unaligned reloc use. */ 10967 if ((r_type == R_PPC64_ADDR64 && (out_off & 7) != 0) 10968 || (r_type == R_PPC64_UADDR64 && (out_off & 7) == 0)) 10969 r_type ^= R_PPC64_ADDR64 ^ R_PPC64_UADDR64; 10970 else if ((r_type == R_PPC64_ADDR32 && (out_off & 3) != 0) 10971 || (r_type == R_PPC64_UADDR32 && (out_off & 3) == 0)) 10972 r_type ^= R_PPC64_ADDR32 ^ R_PPC64_UADDR32; 10973 else if ((r_type == R_PPC64_ADDR16 && (out_off & 1) != 0) 10974 || (r_type == R_PPC64_UADDR16 && (out_off & 1) == 0)) 10975 r_type ^= R_PPC64_ADDR16 ^ R_PPC64_UADDR16; 10976 10977 if (skip) 10978 memset (&outrel, 0, sizeof outrel); 10979 else if (!SYMBOL_REFERENCES_LOCAL (info, &h->elf) 10980 && !is_opd 10981 && r_type != R_PPC64_TOC) 10982 outrel.r_info = ELF64_R_INFO (h->elf.dynindx, r_type); 10983 else 10984 { 10985 /* This symbol is local, or marked to become local, 10986 or this is an opd section reloc which must point 10987 at a local function. */ 10988 outrel.r_addend += relocation; 10989 if (r_type == R_PPC64_ADDR64 || r_type == R_PPC64_TOC) 10990 { 10991 if (is_opd && h != NULL) 10992 { 10993 /* Lie about opd entries. This case occurs 10994 when building shared libraries and we 10995 reference a function in another shared 10996 lib. The same thing happens for a weak 10997 definition in an application that's 10998 overridden by a strong definition in a 10999 shared lib. (I believe this is a generic 11000 bug in binutils handling of weak syms.) 11001 In these cases we won't use the opd 11002 entry in this lib. */ 11003 unresolved_reloc = FALSE; 11004 } 11005 outrel.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); 11006 11007 /* We need to relocate .opd contents for ld.so. 11008 Prelink also wants simple and consistent rules 11009 for relocs. This make all RELATIVE relocs have 11010 *r_offset equal to r_addend. */ 11011 relocate = TRUE; 11012 } 11013 else 11014 { 11015 long indx = 0; 11016 11017 if (bfd_is_abs_section (sec)) 11018 ; 11019 else if (sec == NULL || sec->owner == NULL) 11020 { 11021 bfd_set_error (bfd_error_bad_value); 11022 return FALSE; 11023 } 11024 else 11025 { 11026 asection *osec; 11027 11028 osec = sec->output_section; 11029 indx = elf_section_data (osec)->dynindx; 11030 11031 if (indx == 0) 11032 { 11033 if ((osec->flags & SEC_READONLY) == 0 11034 && htab->elf.data_index_section != NULL) 11035 osec = htab->elf.data_index_section; 11036 else 11037 osec = htab->elf.text_index_section; 11038 indx = elf_section_data (osec)->dynindx; 11039 } 11040 BFD_ASSERT (indx != 0); 11041 11042 /* We are turning this relocation into one 11043 against a section symbol, so subtract out 11044 the output section's address but not the 11045 offset of the input section in the output 11046 section. */ 11047 outrel.r_addend -= osec->vma; 11048 } 11049 11050 outrel.r_info = ELF64_R_INFO (indx, r_type); 11051 } 11052 } 11053 11054 sreloc = elf_section_data (input_section)->sreloc; 11055 if (sreloc == NULL) 11056 abort (); 11057 11058 if (sreloc->reloc_count * sizeof (Elf64_External_Rela) 11059 >= sreloc->size) 11060 abort (); 11061 loc = sreloc->contents; 11062 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 11063 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 11064 11065 /* If this reloc is against an external symbol, it will 11066 be computed at runtime, so there's no need to do 11067 anything now. However, for the sake of prelink ensure 11068 that the section contents are a known value. */ 11069 if (! relocate) 11070 { 11071 unresolved_reloc = FALSE; 11072 /* The value chosen here is quite arbitrary as ld.so 11073 ignores section contents except for the special 11074 case of .opd where the contents might be accessed 11075 before relocation. Choose zero, as that won't 11076 cause reloc overflow. */ 11077 relocation = 0; 11078 addend = 0; 11079 /* Use *r_offset == r_addend for R_PPC64_ADDR64 relocs 11080 to improve backward compatibility with older 11081 versions of ld. */ 11082 if (r_type == R_PPC64_ADDR64) 11083 addend = outrel.r_addend; 11084 /* Adjust pc_relative relocs to have zero in *r_offset. */ 11085 else if (ppc64_elf_howto_table[r_type]->pc_relative) 11086 addend = (input_section->output_section->vma 11087 + input_section->output_offset 11088 + rel->r_offset); 11089 } 11090 } 11091 break; 11092 11093 case R_PPC64_COPY: 11094 case R_PPC64_GLOB_DAT: 11095 case R_PPC64_JMP_SLOT: 11096 case R_PPC64_RELATIVE: 11097 /* We shouldn't ever see these dynamic relocs in relocatable 11098 files. */ 11099 /* Fall through. */ 11100 11101 case R_PPC64_PLTGOT16: 11102 case R_PPC64_PLTGOT16_DS: 11103 case R_PPC64_PLTGOT16_HA: 11104 case R_PPC64_PLTGOT16_HI: 11105 case R_PPC64_PLTGOT16_LO: 11106 case R_PPC64_PLTGOT16_LO_DS: 11107 case R_PPC64_PLTREL32: 11108 case R_PPC64_PLTREL64: 11109 /* These ones haven't been implemented yet. */ 11110 11111 (*_bfd_error_handler) 11112 (_("%B: relocation %s is not supported for symbol %s."), 11113 input_bfd, 11114 ppc64_elf_howto_table[r_type]->name, sym_name); 11115 11116 bfd_set_error (bfd_error_invalid_operation); 11117 ret = FALSE; 11118 continue; 11119 } 11120 11121 /* Do any further special processing. */ 11122 switch (r_type) 11123 { 11124 default: 11125 break; 11126 11127 case R_PPC64_ADDR16_HA: 11128 case R_PPC64_ADDR16_HIGHERA: 11129 case R_PPC64_ADDR16_HIGHESTA: 11130 case R_PPC64_TOC16_HA: 11131 case R_PPC64_SECTOFF_HA: 11132 case R_PPC64_TPREL16_HA: 11133 case R_PPC64_DTPREL16_HA: 11134 case R_PPC64_TPREL16_HIGHER: 11135 case R_PPC64_TPREL16_HIGHERA: 11136 case R_PPC64_TPREL16_HIGHEST: 11137 case R_PPC64_TPREL16_HIGHESTA: 11138 case R_PPC64_DTPREL16_HIGHER: 11139 case R_PPC64_DTPREL16_HIGHERA: 11140 case R_PPC64_DTPREL16_HIGHEST: 11141 case R_PPC64_DTPREL16_HIGHESTA: 11142 /* It's just possible that this symbol is a weak symbol 11143 that's not actually defined anywhere. In that case, 11144 'sec' would be NULL, and we should leave the symbol 11145 alone (it will be set to zero elsewhere in the link). */ 11146 if (sec == NULL) 11147 break; 11148 /* Fall thru */ 11149 11150 case R_PPC64_GOT16_HA: 11151 case R_PPC64_PLTGOT16_HA: 11152 case R_PPC64_PLT16_HA: 11153 case R_PPC64_GOT_TLSGD16_HA: 11154 case R_PPC64_GOT_TLSLD16_HA: 11155 case R_PPC64_GOT_TPREL16_HA: 11156 case R_PPC64_GOT_DTPREL16_HA: 11157 /* Add 0x10000 if sign bit in 0:15 is set. 11158 Bits 0:15 are not used. */ 11159 addend += 0x8000; 11160 break; 11161 11162 case R_PPC64_ADDR16_DS: 11163 case R_PPC64_ADDR16_LO_DS: 11164 case R_PPC64_GOT16_DS: 11165 case R_PPC64_GOT16_LO_DS: 11166 case R_PPC64_PLT16_LO_DS: 11167 case R_PPC64_SECTOFF_DS: 11168 case R_PPC64_SECTOFF_LO_DS: 11169 case R_PPC64_TOC16_DS: 11170 case R_PPC64_TOC16_LO_DS: 11171 case R_PPC64_PLTGOT16_DS: 11172 case R_PPC64_PLTGOT16_LO_DS: 11173 case R_PPC64_GOT_TPREL16_DS: 11174 case R_PPC64_GOT_TPREL16_LO_DS: 11175 case R_PPC64_GOT_DTPREL16_DS: 11176 case R_PPC64_GOT_DTPREL16_LO_DS: 11177 case R_PPC64_TPREL16_DS: 11178 case R_PPC64_TPREL16_LO_DS: 11179 case R_PPC64_DTPREL16_DS: 11180 case R_PPC64_DTPREL16_LO_DS: 11181 insn = bfd_get_32 (input_bfd, contents + (rel->r_offset & ~3)); 11182 mask = 3; 11183 /* If this reloc is against an lq insn, then the value must be 11184 a multiple of 16. This is somewhat of a hack, but the 11185 "correct" way to do this by defining _DQ forms of all the 11186 _DS relocs bloats all reloc switches in this file. It 11187 doesn't seem to make much sense to use any of these relocs 11188 in data, so testing the insn should be safe. */ 11189 if ((insn & (0x3f << 26)) == (56u << 26)) 11190 mask = 15; 11191 if (((relocation + addend) & mask) != 0) 11192 { 11193 (*_bfd_error_handler) 11194 (_("%B: error: relocation %s not a multiple of %d"), 11195 input_bfd, 11196 ppc64_elf_howto_table[r_type]->name, 11197 mask + 1); 11198 bfd_set_error (bfd_error_bad_value); 11199 ret = FALSE; 11200 continue; 11201 } 11202 break; 11203 } 11204 11205 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 11206 because such sections are not SEC_ALLOC and thus ld.so will 11207 not process them. */ 11208 if (unresolved_reloc 11209 && !((input_section->flags & SEC_DEBUGGING) != 0 11210 && h->elf.def_dynamic)) 11211 { 11212 (*_bfd_error_handler) 11213 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 11214 input_bfd, 11215 input_section, 11216 (long) rel->r_offset, 11217 ppc64_elf_howto_table[(int) r_type]->name, 11218 h->elf.root.root.string); 11219 ret = FALSE; 11220 } 11221 11222 r = _bfd_final_link_relocate (ppc64_elf_howto_table[(int) r_type], 11223 input_bfd, 11224 input_section, 11225 contents, 11226 rel->r_offset, 11227 relocation, 11228 addend); 11229 11230 if (r != bfd_reloc_ok) 11231 { 11232 if (sym_name == NULL) 11233 sym_name = "(null)"; 11234 if (r == bfd_reloc_overflow) 11235 { 11236 if (warned) 11237 continue; 11238 if (h != NULL 11239 && h->elf.root.type == bfd_link_hash_undefweak 11240 && ppc64_elf_howto_table[r_type]->pc_relative) 11241 { 11242 /* Assume this is a call protected by other code that 11243 detects the symbol is undefined. If this is the case, 11244 we can safely ignore the overflow. If not, the 11245 program is hosed anyway, and a little warning isn't 11246 going to help. */ 11247 11248 continue; 11249 } 11250 11251 if (!((*info->callbacks->reloc_overflow) 11252 (info, (h ? &h->elf.root : NULL), sym_name, 11253 ppc64_elf_howto_table[r_type]->name, 11254 orig_addend, input_bfd, input_section, rel->r_offset))) 11255 return FALSE; 11256 } 11257 else 11258 { 11259 (*_bfd_error_handler) 11260 (_("%B(%A+0x%lx): %s reloc against `%s': error %d"), 11261 input_bfd, 11262 input_section, 11263 (long) rel->r_offset, 11264 ppc64_elf_howto_table[r_type]->name, 11265 sym_name, 11266 (int) r); 11267 ret = FALSE; 11268 } 11269 } 11270 } 11271 11272 /* If we're emitting relocations, then shortly after this function 11273 returns, reloc offsets and addends for this section will be 11274 adjusted. Worse, reloc symbol indices will be for the output 11275 file rather than the input. Save a copy of the relocs for 11276 opd_entry_value. */ 11277 if (is_opd && (info->emitrelocations || info->relocatable)) 11278 { 11279 bfd_size_type amt; 11280 amt = input_section->reloc_count * sizeof (Elf_Internal_Rela); 11281 rel = bfd_alloc (input_bfd, amt); 11282 BFD_ASSERT (ppc64_elf_tdata (input_bfd)->opd_relocs == NULL); 11283 ppc64_elf_tdata (input_bfd)->opd_relocs = rel; 11284 if (rel == NULL) 11285 return FALSE; 11286 memcpy (rel, relocs, amt); 11287 } 11288 return ret; 11289} 11290 11291/* Adjust the value of any local symbols in opd sections. */ 11292 11293static bfd_boolean 11294ppc64_elf_output_symbol_hook (struct bfd_link_info *info, 11295 const char *name ATTRIBUTE_UNUSED, 11296 Elf_Internal_Sym *elfsym, 11297 asection *input_sec, 11298 struct elf_link_hash_entry *h) 11299{ 11300 long *opd_adjust, adjust; 11301 bfd_vma value; 11302 11303 if (h != NULL) 11304 return TRUE; 11305 11306 opd_adjust = get_opd_info (input_sec); 11307 if (opd_adjust == NULL) 11308 return TRUE; 11309 11310 value = elfsym->st_value - input_sec->output_offset; 11311 if (!info->relocatable) 11312 value -= input_sec->output_section->vma; 11313 11314 adjust = opd_adjust[value / 8]; 11315 if (adjust == -1) 11316 elfsym->st_value = 0; 11317 else 11318 elfsym->st_value += adjust; 11319 return TRUE; 11320} 11321 11322/* Finish up dynamic symbol handling. We set the contents of various 11323 dynamic sections here. */ 11324 11325static bfd_boolean 11326ppc64_elf_finish_dynamic_symbol (bfd *output_bfd, 11327 struct bfd_link_info *info, 11328 struct elf_link_hash_entry *h, 11329 Elf_Internal_Sym *sym) 11330{ 11331 struct ppc_link_hash_table *htab; 11332 struct plt_entry *ent; 11333 Elf_Internal_Rela rela; 11334 bfd_byte *loc; 11335 11336 htab = ppc_hash_table (info); 11337 11338 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 11339 if (ent->plt.offset != (bfd_vma) -1) 11340 { 11341 /* This symbol has an entry in the procedure linkage 11342 table. Set it up. */ 11343 11344 if (htab->plt == NULL 11345 || htab->relplt == NULL 11346 || htab->glink == NULL) 11347 abort (); 11348 11349 /* Create a JMP_SLOT reloc to inform the dynamic linker to 11350 fill in the PLT entry. */ 11351 rela.r_offset = (htab->plt->output_section->vma 11352 + htab->plt->output_offset 11353 + ent->plt.offset); 11354 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_JMP_SLOT); 11355 rela.r_addend = ent->addend; 11356 11357 loc = htab->relplt->contents; 11358 loc += ((ent->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE 11359 * sizeof (Elf64_External_Rela)); 11360 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 11361 } 11362 11363 if (h->needs_copy) 11364 { 11365 Elf_Internal_Rela rela; 11366 bfd_byte *loc; 11367 11368 /* This symbol needs a copy reloc. Set it up. */ 11369 11370 if (h->dynindx == -1 11371 || (h->root.type != bfd_link_hash_defined 11372 && h->root.type != bfd_link_hash_defweak) 11373 || htab->relbss == NULL) 11374 abort (); 11375 11376 rela.r_offset = (h->root.u.def.value 11377 + h->root.u.def.section->output_section->vma 11378 + h->root.u.def.section->output_offset); 11379 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_COPY); 11380 rela.r_addend = 0; 11381 loc = htab->relbss->contents; 11382 loc += htab->relbss->reloc_count++ * sizeof (Elf64_External_Rela); 11383 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 11384 } 11385 11386 /* Mark some specially defined symbols as absolute. */ 11387 if (strcmp (h->root.root.string, "_DYNAMIC") == 0) 11388 sym->st_shndx = SHN_ABS; 11389 11390 return TRUE; 11391} 11392 11393/* Used to decide how to sort relocs in an optimal manner for the 11394 dynamic linker, before writing them out. */ 11395 11396static enum elf_reloc_type_class 11397ppc64_elf_reloc_type_class (const Elf_Internal_Rela *rela) 11398{ 11399 enum elf_ppc64_reloc_type r_type; 11400 11401 r_type = ELF64_R_TYPE (rela->r_info); 11402 switch (r_type) 11403 { 11404 case R_PPC64_RELATIVE: 11405 return reloc_class_relative; 11406 case R_PPC64_JMP_SLOT: 11407 return reloc_class_plt; 11408 case R_PPC64_COPY: 11409 return reloc_class_copy; 11410 default: 11411 return reloc_class_normal; 11412 } 11413} 11414 11415/* Finish up the dynamic sections. */ 11416 11417static bfd_boolean 11418ppc64_elf_finish_dynamic_sections (bfd *output_bfd, 11419 struct bfd_link_info *info) 11420{ 11421 struct ppc_link_hash_table *htab; 11422 bfd *dynobj; 11423 asection *sdyn; 11424 11425 htab = ppc_hash_table (info); 11426 dynobj = htab->elf.dynobj; 11427 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 11428 11429 if (htab->elf.dynamic_sections_created) 11430 { 11431 Elf64_External_Dyn *dyncon, *dynconend; 11432 11433 if (sdyn == NULL || htab->got == NULL) 11434 abort (); 11435 11436 dyncon = (Elf64_External_Dyn *) sdyn->contents; 11437 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); 11438 for (; dyncon < dynconend; dyncon++) 11439 { 11440 Elf_Internal_Dyn dyn; 11441 asection *s; 11442 11443 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); 11444 11445 switch (dyn.d_tag) 11446 { 11447 default: 11448 continue; 11449 11450 case DT_PPC64_GLINK: 11451 s = htab->glink; 11452 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 11453 /* We stupidly defined DT_PPC64_GLINK to be the start 11454 of glink rather than the first entry point, which is 11455 what ld.so needs, and now have a bigger stub to 11456 support automatic multiple TOCs. */ 11457 dyn.d_un.d_ptr += GLINK_CALL_STUB_SIZE - 32; 11458 break; 11459 11460 case DT_PPC64_OPD: 11461 s = bfd_get_section_by_name (output_bfd, ".opd"); 11462 if (s == NULL) 11463 continue; 11464 dyn.d_un.d_ptr = s->vma; 11465 break; 11466 11467 case DT_PPC64_OPDSZ: 11468 s = bfd_get_section_by_name (output_bfd, ".opd"); 11469 if (s == NULL) 11470 continue; 11471 dyn.d_un.d_val = s->size; 11472 break; 11473 11474 case DT_PLTGOT: 11475 s = htab->plt; 11476 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 11477 break; 11478 11479 case DT_JMPREL: 11480 s = htab->relplt; 11481 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 11482 break; 11483 11484 case DT_PLTRELSZ: 11485 dyn.d_un.d_val = htab->relplt->size; 11486 break; 11487 11488 case DT_RELASZ: 11489 /* Don't count procedure linkage table relocs in the 11490 overall reloc count. */ 11491 s = htab->relplt; 11492 if (s == NULL) 11493 continue; 11494 dyn.d_un.d_val -= s->size; 11495 break; 11496 11497 case DT_RELA: 11498 /* We may not be using the standard ELF linker script. 11499 If .rela.plt is the first .rela section, we adjust 11500 DT_RELA to not include it. */ 11501 s = htab->relplt; 11502 if (s == NULL) 11503 continue; 11504 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) 11505 continue; 11506 dyn.d_un.d_ptr += s->size; 11507 break; 11508 } 11509 11510 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); 11511 } 11512 } 11513 11514 if (htab->got != NULL && htab->got->size != 0) 11515 { 11516 /* Fill in the first entry in the global offset table. 11517 We use it to hold the link-time TOCbase. */ 11518 bfd_put_64 (output_bfd, 11519 elf_gp (output_bfd) + TOC_BASE_OFF, 11520 htab->got->contents); 11521 11522 /* Set .got entry size. */ 11523 elf_section_data (htab->got->output_section)->this_hdr.sh_entsize = 8; 11524 } 11525 11526 if (htab->plt != NULL && htab->plt->size != 0) 11527 { 11528 /* Set .plt entry size. */ 11529 elf_section_data (htab->plt->output_section)->this_hdr.sh_entsize 11530 = PLT_ENTRY_SIZE; 11531 } 11532 11533 /* brlt is SEC_LINKER_CREATED, so we need to write out relocs for 11534 brlt ourselves if emitrelocations. */ 11535 if (htab->brlt != NULL 11536 && htab->brlt->reloc_count != 0 11537 && !_bfd_elf_link_output_relocs (output_bfd, 11538 htab->brlt, 11539 &elf_section_data (htab->brlt)->rel_hdr, 11540 elf_section_data (htab->brlt)->relocs, 11541 NULL)) 11542 return FALSE; 11543 11544 /* We need to handle writing out multiple GOT sections ourselves, 11545 since we didn't add them to DYNOBJ. We know dynobj is the first 11546 bfd. */ 11547 while ((dynobj = dynobj->link_next) != NULL) 11548 { 11549 asection *s; 11550 11551 if (!is_ppc64_elf_target (dynobj->xvec)) 11552 continue; 11553 11554 s = ppc64_elf_tdata (dynobj)->got; 11555 if (s != NULL 11556 && s->size != 0 11557 && s->output_section != bfd_abs_section_ptr 11558 && !bfd_set_section_contents (output_bfd, s->output_section, 11559 s->contents, s->output_offset, 11560 s->size)) 11561 return FALSE; 11562 s = ppc64_elf_tdata (dynobj)->relgot; 11563 if (s != NULL 11564 && s->size != 0 11565 && s->output_section != bfd_abs_section_ptr 11566 && !bfd_set_section_contents (output_bfd, s->output_section, 11567 s->contents, s->output_offset, 11568 s->size)) 11569 return FALSE; 11570 } 11571 11572 return TRUE; 11573} 11574 11575#include "elf64-target.h" 11576