1/* PowerPC64-specific support for 64-bit ELF. 2 Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 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 2 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/* The 64-bit PowerPC ELF ABI may be found at 25 http://www.linuxbase.org/spec/ELF/ppc64/PPC-elf64abi.txt, and 26 http://www.linuxbase.org/spec/ELF/ppc64/spec/book1.html */ 27 28#include <stdarg.h> 29#include "bfd.h" 30#include "sysdep.h" 31#include "bfdlink.h" 32#include "libbfd.h" 33#include "elf-bfd.h" 34#include "elf/ppc64.h" 35#include "elf64-ppc.h" 36 37static bfd_reloc_status_type ppc64_elf_ha_reloc 38 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 39static bfd_reloc_status_type ppc64_elf_branch_reloc 40 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 41static bfd_reloc_status_type ppc64_elf_brtaken_reloc 42 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 43static bfd_reloc_status_type ppc64_elf_sectoff_reloc 44 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 45static bfd_reloc_status_type ppc64_elf_sectoff_ha_reloc 46 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 47static bfd_reloc_status_type ppc64_elf_toc_reloc 48 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 49static bfd_reloc_status_type ppc64_elf_toc_ha_reloc 50 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 51static bfd_reloc_status_type ppc64_elf_toc64_reloc 52 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 53static bfd_reloc_status_type ppc64_elf_unhandled_reloc 54 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 55static bfd_vma opd_entry_value 56 (asection *, bfd_vma, asection **, bfd_vma *); 57 58#define TARGET_LITTLE_SYM bfd_elf64_powerpcle_vec 59#define TARGET_LITTLE_NAME "elf64-powerpcle" 60#define TARGET_BIG_SYM bfd_elf64_powerpc_vec 61#define TARGET_BIG_NAME "elf64-powerpc" 62#define ELF_ARCH bfd_arch_powerpc 63#define ELF_MACHINE_CODE EM_PPC64 64#define ELF_MAXPAGESIZE 0x10000 65#define ELF_COMMONPAGESIZE 0x1000 66#define elf_info_to_howto ppc64_elf_info_to_howto 67 68#define elf_backend_want_got_sym 0 69#define elf_backend_want_plt_sym 0 70#define elf_backend_plt_alignment 3 71#define elf_backend_plt_not_loaded 1 72#define elf_backend_got_header_size 8 73#define elf_backend_can_gc_sections 1 74#define elf_backend_can_refcount 1 75#define elf_backend_rela_normal 1 76 77#define bfd_elf64_mkobject ppc64_elf_mkobject 78#define bfd_elf64_bfd_reloc_type_lookup ppc64_elf_reloc_type_lookup 79#define bfd_elf64_bfd_merge_private_bfd_data ppc64_elf_merge_private_bfd_data 80#define bfd_elf64_new_section_hook ppc64_elf_new_section_hook 81#define bfd_elf64_bfd_link_hash_table_create ppc64_elf_link_hash_table_create 82#define bfd_elf64_bfd_link_hash_table_free ppc64_elf_link_hash_table_free 83#define bfd_elf64_get_synthetic_symtab ppc64_elf_get_synthetic_symtab 84 85#define elf_backend_object_p ppc64_elf_object_p 86#define elf_backend_grok_prstatus ppc64_elf_grok_prstatus 87#define elf_backend_grok_psinfo ppc64_elf_grok_psinfo 88#define elf_backend_write_core_note ppc64_elf_write_core_note 89#define elf_backend_create_dynamic_sections ppc64_elf_create_dynamic_sections 90#define elf_backend_copy_indirect_symbol ppc64_elf_copy_indirect_symbol 91#define elf_backend_add_symbol_hook ppc64_elf_add_symbol_hook 92#define elf_backend_check_directives ppc64_elf_check_directives 93#define elf_backend_as_needed_cleanup ppc64_elf_as_needed_cleanup 94#define elf_backend_archive_symbol_lookup ppc64_elf_archive_symbol_lookup 95#define elf_backend_check_relocs ppc64_elf_check_relocs 96#define elf_backend_gc_mark_dynamic_ref ppc64_elf_gc_mark_dynamic_ref 97#define elf_backend_gc_mark_hook ppc64_elf_gc_mark_hook 98#define elf_backend_gc_sweep_hook ppc64_elf_gc_sweep_hook 99#define elf_backend_adjust_dynamic_symbol ppc64_elf_adjust_dynamic_symbol 100#define elf_backend_hide_symbol ppc64_elf_hide_symbol 101#define elf_backend_always_size_sections ppc64_elf_func_desc_adjust 102#define elf_backend_size_dynamic_sections ppc64_elf_size_dynamic_sections 103#define elf_backend_init_index_section _bfd_elf_init_2_index_sections 104#define elf_backend_action_discarded ppc64_elf_action_discarded 105#define elf_backend_relocate_section ppc64_elf_relocate_section 106#define elf_backend_finish_dynamic_symbol ppc64_elf_finish_dynamic_symbol 107#define elf_backend_reloc_type_class ppc64_elf_reloc_type_class 108#define elf_backend_finish_dynamic_sections ppc64_elf_finish_dynamic_sections 109#define elf_backend_link_output_symbol_hook ppc64_elf_output_symbol_hook 110#define elf_backend_special_sections ppc64_elf_special_sections 111 112/* The name of the dynamic interpreter. This is put in the .interp 113 section. */ 114#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 115 116/* The size in bytes of an entry in the procedure linkage table. */ 117#define PLT_ENTRY_SIZE 24 118 119/* The initial size of the plt reserved for the dynamic linker. */ 120#define PLT_INITIAL_ENTRY_SIZE PLT_ENTRY_SIZE 121 122/* TOC base pointers offset from start of TOC. */ 123#define TOC_BASE_OFF 0x8000 124 125/* Offset of tp and dtp pointers from start of TLS block. */ 126#define TP_OFFSET 0x7000 127#define DTP_OFFSET 0x8000 128 129/* .plt call stub instructions. The normal stub is like this, but 130 sometimes the .plt entry crosses a 64k boundary and we need to 131 insert an addis to adjust r12. */ 132#define PLT_CALL_STUB_SIZE (7*4) 133#define ADDIS_R12_R2 0x3d820000 /* addis %r12,%r2,xxx@ha */ 134#define STD_R2_40R1 0xf8410028 /* std %r2,40(%r1) */ 135#define LD_R11_0R12 0xe96c0000 /* ld %r11,xxx+0@l(%r12) */ 136#define LD_R2_0R12 0xe84c0000 /* ld %r2,xxx+8@l(%r12) */ 137#define MTCTR_R11 0x7d6903a6 /* mtctr %r11 */ 138 /* ld %r11,xxx+16@l(%r12) */ 139#define BCTR 0x4e800420 /* bctr */ 140 141 142#define ADDIS_R12_R12 0x3d8c0000 /* addis %r12,%r12,off@ha */ 143#define ADDIS_R2_R2 0x3c420000 /* addis %r2,%r2,off@ha */ 144#define ADDI_R2_R2 0x38420000 /* addi %r2,%r2,off@l */ 145 146#define LD_R2_40R1 0xe8410028 /* ld %r2,40(%r1) */ 147 148/* glink call stub instructions. We enter with the index in R0. */ 149#define GLINK_CALL_STUB_SIZE (16*4) 150 /* 0: */ 151 /* .quad plt0-1f */ 152 /* __glink: */ 153#define MFLR_R12 0x7d8802a6 /* mflr %12 */ 154#define BCL_20_31 0x429f0005 /* bcl 20,31,1f */ 155 /* 1: */ 156#define MFLR_R11 0x7d6802a6 /* mflr %11 */ 157#define LD_R2_M16R11 0xe84bfff0 /* ld %2,(0b-1b)(%11) */ 158#define MTLR_R12 0x7d8803a6 /* mtlr %12 */ 159#define ADD_R12_R2_R11 0x7d825a14 /* add %12,%2,%11 */ 160 /* ld %11,0(%12) */ 161 /* ld %2,8(%12) */ 162 /* mtctr %11 */ 163 /* ld %11,16(%12) */ 164 /* bctr */ 165 166/* Pad with this. */ 167#define NOP 0x60000000 168 169/* Some other nops. */ 170#define CROR_151515 0x4def7b82 171#define CROR_313131 0x4ffffb82 172 173/* .glink entries for the first 32k functions are two instructions. */ 174#define LI_R0_0 0x38000000 /* li %r0,0 */ 175#define B_DOT 0x48000000 /* b . */ 176 177/* After that, we need two instructions to load the index, followed by 178 a branch. */ 179#define LIS_R0_0 0x3c000000 /* lis %r0,0 */ 180#define ORI_R0_R0_0 0x60000000 /* ori %r0,%r0,0 */ 181 182/* Instructions used by the save and restore reg functions. */ 183#define STD_R0_0R1 0xf8010000 /* std %r0,0(%r1) */ 184#define STD_R0_0R12 0xf80c0000 /* std %r0,0(%r12) */ 185#define LD_R0_0R1 0xe8010000 /* ld %r0,0(%r1) */ 186#define LD_R0_0R12 0xe80c0000 /* ld %r0,0(%r12) */ 187#define STFD_FR0_0R1 0xd8010000 /* stfd %fr0,0(%r1) */ 188#define LFD_FR0_0R1 0xc8010000 /* lfd %fr0,0(%r1) */ 189#define LI_R12_0 0x39800000 /* li %r12,0 */ 190#define STVX_VR0_R12_R0 0x7c0c01ce /* stvx %v0,%r12,%r0 */ 191#define LVX_VR0_R12_R0 0x7c0c00ce /* lvx %v0,%r12,%r0 */ 192#define MTLR_R0 0x7c0803a6 /* mtlr %r0 */ 193#define BLR 0x4e800020 /* blr */ 194 195/* Since .opd is an array of descriptors and each entry will end up 196 with identical R_PPC64_RELATIVE relocs, there is really no need to 197 propagate .opd relocs; The dynamic linker should be taught to 198 relocate .opd without reloc entries. */ 199#ifndef NO_OPD_RELOCS 200#define NO_OPD_RELOCS 0 201#endif 202 203#define ONES(n) (((bfd_vma) 1 << ((n) - 1) << 1) - 1) 204 205/* Relocation HOWTO's. */ 206static reloc_howto_type *ppc64_elf_howto_table[(int) R_PPC64_max]; 207 208static reloc_howto_type ppc64_elf_howto_raw[] = { 209 /* This reloc does nothing. */ 210 HOWTO (R_PPC64_NONE, /* type */ 211 0, /* rightshift */ 212 2, /* size (0 = byte, 1 = short, 2 = long) */ 213 32, /* bitsize */ 214 FALSE, /* pc_relative */ 215 0, /* bitpos */ 216 complain_overflow_dont, /* complain_on_overflow */ 217 bfd_elf_generic_reloc, /* special_function */ 218 "R_PPC64_NONE", /* name */ 219 FALSE, /* partial_inplace */ 220 0, /* src_mask */ 221 0, /* dst_mask */ 222 FALSE), /* pcrel_offset */ 223 224 /* A standard 32 bit relocation. */ 225 HOWTO (R_PPC64_ADDR32, /* type */ 226 0, /* rightshift */ 227 2, /* size (0 = byte, 1 = short, 2 = long) */ 228 32, /* bitsize */ 229 FALSE, /* pc_relative */ 230 0, /* bitpos */ 231 complain_overflow_bitfield, /* complain_on_overflow */ 232 bfd_elf_generic_reloc, /* special_function */ 233 "R_PPC64_ADDR32", /* name */ 234 FALSE, /* partial_inplace */ 235 0, /* src_mask */ 236 0xffffffff, /* dst_mask */ 237 FALSE), /* pcrel_offset */ 238 239 /* An absolute 26 bit branch; the lower two bits must be zero. 240 FIXME: we don't check that, we just clear them. */ 241 HOWTO (R_PPC64_ADDR24, /* type */ 242 0, /* rightshift */ 243 2, /* size (0 = byte, 1 = short, 2 = long) */ 244 26, /* bitsize */ 245 FALSE, /* pc_relative */ 246 0, /* bitpos */ 247 complain_overflow_bitfield, /* complain_on_overflow */ 248 bfd_elf_generic_reloc, /* special_function */ 249 "R_PPC64_ADDR24", /* name */ 250 FALSE, /* partial_inplace */ 251 0, /* src_mask */ 252 0x03fffffc, /* dst_mask */ 253 FALSE), /* pcrel_offset */ 254 255 /* A standard 16 bit relocation. */ 256 HOWTO (R_PPC64_ADDR16, /* type */ 257 0, /* rightshift */ 258 1, /* size (0 = byte, 1 = short, 2 = long) */ 259 16, /* bitsize */ 260 FALSE, /* pc_relative */ 261 0, /* bitpos */ 262 complain_overflow_bitfield, /* complain_on_overflow */ 263 bfd_elf_generic_reloc, /* special_function */ 264 "R_PPC64_ADDR16", /* name */ 265 FALSE, /* partial_inplace */ 266 0, /* src_mask */ 267 0xffff, /* dst_mask */ 268 FALSE), /* pcrel_offset */ 269 270 /* A 16 bit relocation without overflow. */ 271 HOWTO (R_PPC64_ADDR16_LO, /* type */ 272 0, /* rightshift */ 273 1, /* size (0 = byte, 1 = short, 2 = long) */ 274 16, /* bitsize */ 275 FALSE, /* pc_relative */ 276 0, /* bitpos */ 277 complain_overflow_dont,/* complain_on_overflow */ 278 bfd_elf_generic_reloc, /* special_function */ 279 "R_PPC64_ADDR16_LO", /* name */ 280 FALSE, /* partial_inplace */ 281 0, /* src_mask */ 282 0xffff, /* dst_mask */ 283 FALSE), /* pcrel_offset */ 284 285 /* Bits 16-31 of an address. */ 286 HOWTO (R_PPC64_ADDR16_HI, /* type */ 287 16, /* rightshift */ 288 1, /* size (0 = byte, 1 = short, 2 = long) */ 289 16, /* bitsize */ 290 FALSE, /* pc_relative */ 291 0, /* bitpos */ 292 complain_overflow_dont, /* complain_on_overflow */ 293 bfd_elf_generic_reloc, /* special_function */ 294 "R_PPC64_ADDR16_HI", /* name */ 295 FALSE, /* partial_inplace */ 296 0, /* src_mask */ 297 0xffff, /* dst_mask */ 298 FALSE), /* pcrel_offset */ 299 300 /* Bits 16-31 of an address, plus 1 if the contents of the low 16 301 bits, treated as a signed number, is negative. */ 302 HOWTO (R_PPC64_ADDR16_HA, /* type */ 303 16, /* rightshift */ 304 1, /* size (0 = byte, 1 = short, 2 = long) */ 305 16, /* bitsize */ 306 FALSE, /* pc_relative */ 307 0, /* bitpos */ 308 complain_overflow_dont, /* complain_on_overflow */ 309 ppc64_elf_ha_reloc, /* special_function */ 310 "R_PPC64_ADDR16_HA", /* name */ 311 FALSE, /* partial_inplace */ 312 0, /* src_mask */ 313 0xffff, /* dst_mask */ 314 FALSE), /* pcrel_offset */ 315 316 /* An absolute 16 bit branch; the lower two bits must be zero. 317 FIXME: we don't check that, we just clear them. */ 318 HOWTO (R_PPC64_ADDR14, /* type */ 319 0, /* rightshift */ 320 2, /* size (0 = byte, 1 = short, 2 = long) */ 321 16, /* bitsize */ 322 FALSE, /* pc_relative */ 323 0, /* bitpos */ 324 complain_overflow_bitfield, /* complain_on_overflow */ 325 ppc64_elf_branch_reloc, /* special_function */ 326 "R_PPC64_ADDR14", /* name */ 327 FALSE, /* partial_inplace */ 328 0, /* src_mask */ 329 0x0000fffc, /* dst_mask */ 330 FALSE), /* pcrel_offset */ 331 332 /* An absolute 16 bit branch, for which bit 10 should be set to 333 indicate that the branch is expected to be taken. The lower two 334 bits must be zero. */ 335 HOWTO (R_PPC64_ADDR14_BRTAKEN, /* type */ 336 0, /* rightshift */ 337 2, /* size (0 = byte, 1 = short, 2 = long) */ 338 16, /* bitsize */ 339 FALSE, /* pc_relative */ 340 0, /* bitpos */ 341 complain_overflow_bitfield, /* complain_on_overflow */ 342 ppc64_elf_brtaken_reloc, /* special_function */ 343 "R_PPC64_ADDR14_BRTAKEN",/* name */ 344 FALSE, /* partial_inplace */ 345 0, /* src_mask */ 346 0x0000fffc, /* dst_mask */ 347 FALSE), /* pcrel_offset */ 348 349 /* An absolute 16 bit branch, for which bit 10 should be set to 350 indicate that the branch is not expected to be taken. The lower 351 two bits must be zero. */ 352 HOWTO (R_PPC64_ADDR14_BRNTAKEN, /* type */ 353 0, /* rightshift */ 354 2, /* size (0 = byte, 1 = short, 2 = long) */ 355 16, /* bitsize */ 356 FALSE, /* pc_relative */ 357 0, /* bitpos */ 358 complain_overflow_bitfield, /* complain_on_overflow */ 359 ppc64_elf_brtaken_reloc, /* special_function */ 360 "R_PPC64_ADDR14_BRNTAKEN",/* name */ 361 FALSE, /* partial_inplace */ 362 0, /* src_mask */ 363 0x0000fffc, /* dst_mask */ 364 FALSE), /* pcrel_offset */ 365 366 /* A relative 26 bit branch; the lower two bits must be zero. */ 367 HOWTO (R_PPC64_REL24, /* type */ 368 0, /* rightshift */ 369 2, /* size (0 = byte, 1 = short, 2 = long) */ 370 26, /* bitsize */ 371 TRUE, /* pc_relative */ 372 0, /* bitpos */ 373 complain_overflow_signed, /* complain_on_overflow */ 374 ppc64_elf_branch_reloc, /* special_function */ 375 "R_PPC64_REL24", /* name */ 376 FALSE, /* partial_inplace */ 377 0, /* src_mask */ 378 0x03fffffc, /* dst_mask */ 379 TRUE), /* pcrel_offset */ 380 381 /* A relative 16 bit branch; the lower two bits must be zero. */ 382 HOWTO (R_PPC64_REL14, /* type */ 383 0, /* rightshift */ 384 2, /* size (0 = byte, 1 = short, 2 = long) */ 385 16, /* bitsize */ 386 TRUE, /* pc_relative */ 387 0, /* bitpos */ 388 complain_overflow_signed, /* complain_on_overflow */ 389 ppc64_elf_branch_reloc, /* special_function */ 390 "R_PPC64_REL14", /* name */ 391 FALSE, /* partial_inplace */ 392 0, /* src_mask */ 393 0x0000fffc, /* dst_mask */ 394 TRUE), /* pcrel_offset */ 395 396 /* A relative 16 bit branch. Bit 10 should be set to indicate that 397 the branch is expected to be taken. The lower two bits must be 398 zero. */ 399 HOWTO (R_PPC64_REL14_BRTAKEN, /* type */ 400 0, /* rightshift */ 401 2, /* size (0 = byte, 1 = short, 2 = long) */ 402 16, /* bitsize */ 403 TRUE, /* pc_relative */ 404 0, /* bitpos */ 405 complain_overflow_signed, /* complain_on_overflow */ 406 ppc64_elf_brtaken_reloc, /* special_function */ 407 "R_PPC64_REL14_BRTAKEN", /* name */ 408 FALSE, /* partial_inplace */ 409 0, /* src_mask */ 410 0x0000fffc, /* dst_mask */ 411 TRUE), /* pcrel_offset */ 412 413 /* A relative 16 bit branch. Bit 10 should be set to indicate that 414 the branch is not expected to be taken. The lower two bits must 415 be zero. */ 416 HOWTO (R_PPC64_REL14_BRNTAKEN, /* type */ 417 0, /* rightshift */ 418 2, /* size (0 = byte, 1 = short, 2 = long) */ 419 16, /* bitsize */ 420 TRUE, /* pc_relative */ 421 0, /* bitpos */ 422 complain_overflow_signed, /* complain_on_overflow */ 423 ppc64_elf_brtaken_reloc, /* special_function */ 424 "R_PPC64_REL14_BRNTAKEN",/* name */ 425 FALSE, /* partial_inplace */ 426 0, /* src_mask */ 427 0x0000fffc, /* dst_mask */ 428 TRUE), /* pcrel_offset */ 429 430 /* Like R_PPC64_ADDR16, but referring to the GOT table entry for the 431 symbol. */ 432 HOWTO (R_PPC64_GOT16, /* type */ 433 0, /* rightshift */ 434 1, /* size (0 = byte, 1 = short, 2 = long) */ 435 16, /* bitsize */ 436 FALSE, /* pc_relative */ 437 0, /* bitpos */ 438 complain_overflow_signed, /* complain_on_overflow */ 439 ppc64_elf_unhandled_reloc, /* special_function */ 440 "R_PPC64_GOT16", /* name */ 441 FALSE, /* partial_inplace */ 442 0, /* src_mask */ 443 0xffff, /* dst_mask */ 444 FALSE), /* pcrel_offset */ 445 446 /* Like R_PPC64_ADDR16_LO, but referring to the GOT table entry for 447 the symbol. */ 448 HOWTO (R_PPC64_GOT16_LO, /* type */ 449 0, /* rightshift */ 450 1, /* size (0 = byte, 1 = short, 2 = long) */ 451 16, /* bitsize */ 452 FALSE, /* pc_relative */ 453 0, /* bitpos */ 454 complain_overflow_dont, /* complain_on_overflow */ 455 ppc64_elf_unhandled_reloc, /* special_function */ 456 "R_PPC64_GOT16_LO", /* name */ 457 FALSE, /* partial_inplace */ 458 0, /* src_mask */ 459 0xffff, /* dst_mask */ 460 FALSE), /* pcrel_offset */ 461 462 /* Like R_PPC64_ADDR16_HI, but referring to the GOT table entry for 463 the symbol. */ 464 HOWTO (R_PPC64_GOT16_HI, /* type */ 465 16, /* rightshift */ 466 1, /* size (0 = byte, 1 = short, 2 = long) */ 467 16, /* bitsize */ 468 FALSE, /* pc_relative */ 469 0, /* bitpos */ 470 complain_overflow_dont,/* complain_on_overflow */ 471 ppc64_elf_unhandled_reloc, /* special_function */ 472 "R_PPC64_GOT16_HI", /* name */ 473 FALSE, /* partial_inplace */ 474 0, /* src_mask */ 475 0xffff, /* dst_mask */ 476 FALSE), /* pcrel_offset */ 477 478 /* Like R_PPC64_ADDR16_HA, but referring to the GOT table entry for 479 the symbol. */ 480 HOWTO (R_PPC64_GOT16_HA, /* type */ 481 16, /* rightshift */ 482 1, /* size (0 = byte, 1 = short, 2 = long) */ 483 16, /* bitsize */ 484 FALSE, /* pc_relative */ 485 0, /* bitpos */ 486 complain_overflow_dont,/* complain_on_overflow */ 487 ppc64_elf_unhandled_reloc, /* special_function */ 488 "R_PPC64_GOT16_HA", /* name */ 489 FALSE, /* partial_inplace */ 490 0, /* src_mask */ 491 0xffff, /* dst_mask */ 492 FALSE), /* pcrel_offset */ 493 494 /* This is used only by the dynamic linker. The symbol should exist 495 both in the object being run and in some shared library. The 496 dynamic linker copies the data addressed by the symbol from the 497 shared library into the object, because the object being 498 run has to have the data at some particular address. */ 499 HOWTO (R_PPC64_COPY, /* type */ 500 0, /* rightshift */ 501 0, /* this one is variable size */ 502 0, /* bitsize */ 503 FALSE, /* pc_relative */ 504 0, /* bitpos */ 505 complain_overflow_dont, /* complain_on_overflow */ 506 ppc64_elf_unhandled_reloc, /* special_function */ 507 "R_PPC64_COPY", /* name */ 508 FALSE, /* partial_inplace */ 509 0, /* src_mask */ 510 0, /* dst_mask */ 511 FALSE), /* pcrel_offset */ 512 513 /* Like R_PPC64_ADDR64, but used when setting global offset table 514 entries. */ 515 HOWTO (R_PPC64_GLOB_DAT, /* type */ 516 0, /* rightshift */ 517 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 518 64, /* bitsize */ 519 FALSE, /* pc_relative */ 520 0, /* bitpos */ 521 complain_overflow_dont, /* complain_on_overflow */ 522 ppc64_elf_unhandled_reloc, /* special_function */ 523 "R_PPC64_GLOB_DAT", /* name */ 524 FALSE, /* partial_inplace */ 525 0, /* src_mask */ 526 ONES (64), /* dst_mask */ 527 FALSE), /* pcrel_offset */ 528 529 /* Created by the link editor. Marks a procedure linkage table 530 entry for a symbol. */ 531 HOWTO (R_PPC64_JMP_SLOT, /* type */ 532 0, /* rightshift */ 533 0, /* size (0 = byte, 1 = short, 2 = long) */ 534 0, /* bitsize */ 535 FALSE, /* pc_relative */ 536 0, /* bitpos */ 537 complain_overflow_dont, /* complain_on_overflow */ 538 ppc64_elf_unhandled_reloc, /* special_function */ 539 "R_PPC64_JMP_SLOT", /* name */ 540 FALSE, /* partial_inplace */ 541 0, /* src_mask */ 542 0, /* dst_mask */ 543 FALSE), /* pcrel_offset */ 544 545 /* Used only by the dynamic linker. When the object is run, this 546 doubleword64 is set to the load address of the object, plus the 547 addend. */ 548 HOWTO (R_PPC64_RELATIVE, /* type */ 549 0, /* rightshift */ 550 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 551 64, /* bitsize */ 552 FALSE, /* pc_relative */ 553 0, /* bitpos */ 554 complain_overflow_dont, /* complain_on_overflow */ 555 bfd_elf_generic_reloc, /* special_function */ 556 "R_PPC64_RELATIVE", /* name */ 557 FALSE, /* partial_inplace */ 558 0, /* src_mask */ 559 ONES (64), /* dst_mask */ 560 FALSE), /* pcrel_offset */ 561 562 /* Like R_PPC64_ADDR32, but may be unaligned. */ 563 HOWTO (R_PPC64_UADDR32, /* type */ 564 0, /* rightshift */ 565 2, /* size (0 = byte, 1 = short, 2 = long) */ 566 32, /* bitsize */ 567 FALSE, /* pc_relative */ 568 0, /* bitpos */ 569 complain_overflow_bitfield, /* complain_on_overflow */ 570 bfd_elf_generic_reloc, /* special_function */ 571 "R_PPC64_UADDR32", /* name */ 572 FALSE, /* partial_inplace */ 573 0, /* src_mask */ 574 0xffffffff, /* dst_mask */ 575 FALSE), /* pcrel_offset */ 576 577 /* Like R_PPC64_ADDR16, but may be unaligned. */ 578 HOWTO (R_PPC64_UADDR16, /* type */ 579 0, /* rightshift */ 580 1, /* size (0 = byte, 1 = short, 2 = long) */ 581 16, /* bitsize */ 582 FALSE, /* pc_relative */ 583 0, /* bitpos */ 584 complain_overflow_bitfield, /* complain_on_overflow */ 585 bfd_elf_generic_reloc, /* special_function */ 586 "R_PPC64_UADDR16", /* name */ 587 FALSE, /* partial_inplace */ 588 0, /* src_mask */ 589 0xffff, /* dst_mask */ 590 FALSE), /* pcrel_offset */ 591 592 /* 32-bit PC relative. */ 593 HOWTO (R_PPC64_REL32, /* type */ 594 0, /* rightshift */ 595 2, /* size (0 = byte, 1 = short, 2 = long) */ 596 32, /* bitsize */ 597 TRUE, /* pc_relative */ 598 0, /* bitpos */ 599 /* FIXME: Verify. Was complain_overflow_bitfield. */ 600 complain_overflow_signed, /* complain_on_overflow */ 601 bfd_elf_generic_reloc, /* special_function */ 602 "R_PPC64_REL32", /* name */ 603 FALSE, /* partial_inplace */ 604 0, /* src_mask */ 605 0xffffffff, /* dst_mask */ 606 TRUE), /* pcrel_offset */ 607 608 /* 32-bit relocation to the symbol's procedure linkage table. */ 609 HOWTO (R_PPC64_PLT32, /* type */ 610 0, /* rightshift */ 611 2, /* size (0 = byte, 1 = short, 2 = long) */ 612 32, /* bitsize */ 613 FALSE, /* pc_relative */ 614 0, /* bitpos */ 615 complain_overflow_bitfield, /* complain_on_overflow */ 616 ppc64_elf_unhandled_reloc, /* special_function */ 617 "R_PPC64_PLT32", /* name */ 618 FALSE, /* partial_inplace */ 619 0, /* src_mask */ 620 0xffffffff, /* dst_mask */ 621 FALSE), /* pcrel_offset */ 622 623 /* 32-bit PC relative relocation to the symbol's procedure linkage table. 624 FIXME: R_PPC64_PLTREL32 not supported. */ 625 HOWTO (R_PPC64_PLTREL32, /* type */ 626 0, /* rightshift */ 627 2, /* size (0 = byte, 1 = short, 2 = long) */ 628 32, /* bitsize */ 629 TRUE, /* pc_relative */ 630 0, /* bitpos */ 631 complain_overflow_signed, /* complain_on_overflow */ 632 bfd_elf_generic_reloc, /* special_function */ 633 "R_PPC64_PLTREL32", /* name */ 634 FALSE, /* partial_inplace */ 635 0, /* src_mask */ 636 0xffffffff, /* dst_mask */ 637 TRUE), /* pcrel_offset */ 638 639 /* Like R_PPC64_ADDR16_LO, but referring to the PLT table entry for 640 the symbol. */ 641 HOWTO (R_PPC64_PLT16_LO, /* type */ 642 0, /* rightshift */ 643 1, /* size (0 = byte, 1 = short, 2 = long) */ 644 16, /* bitsize */ 645 FALSE, /* pc_relative */ 646 0, /* bitpos */ 647 complain_overflow_dont, /* complain_on_overflow */ 648 ppc64_elf_unhandled_reloc, /* special_function */ 649 "R_PPC64_PLT16_LO", /* name */ 650 FALSE, /* partial_inplace */ 651 0, /* src_mask */ 652 0xffff, /* dst_mask */ 653 FALSE), /* pcrel_offset */ 654 655 /* Like R_PPC64_ADDR16_HI, but referring to the PLT table entry for 656 the symbol. */ 657 HOWTO (R_PPC64_PLT16_HI, /* type */ 658 16, /* rightshift */ 659 1, /* size (0 = byte, 1 = short, 2 = long) */ 660 16, /* bitsize */ 661 FALSE, /* pc_relative */ 662 0, /* bitpos */ 663 complain_overflow_dont, /* complain_on_overflow */ 664 ppc64_elf_unhandled_reloc, /* special_function */ 665 "R_PPC64_PLT16_HI", /* name */ 666 FALSE, /* partial_inplace */ 667 0, /* src_mask */ 668 0xffff, /* dst_mask */ 669 FALSE), /* pcrel_offset */ 670 671 /* Like R_PPC64_ADDR16_HA, but referring to the PLT table entry for 672 the symbol. */ 673 HOWTO (R_PPC64_PLT16_HA, /* type */ 674 16, /* rightshift */ 675 1, /* size (0 = byte, 1 = short, 2 = long) */ 676 16, /* bitsize */ 677 FALSE, /* pc_relative */ 678 0, /* bitpos */ 679 complain_overflow_dont, /* complain_on_overflow */ 680 ppc64_elf_unhandled_reloc, /* special_function */ 681 "R_PPC64_PLT16_HA", /* name */ 682 FALSE, /* partial_inplace */ 683 0, /* src_mask */ 684 0xffff, /* dst_mask */ 685 FALSE), /* pcrel_offset */ 686 687 /* 16-bit section relative relocation. */ 688 HOWTO (R_PPC64_SECTOFF, /* type */ 689 0, /* rightshift */ 690 1, /* size (0 = byte, 1 = short, 2 = long) */ 691 16, /* bitsize */ 692 FALSE, /* pc_relative */ 693 0, /* bitpos */ 694 complain_overflow_bitfield, /* complain_on_overflow */ 695 ppc64_elf_sectoff_reloc, /* special_function */ 696 "R_PPC64_SECTOFF", /* name */ 697 FALSE, /* partial_inplace */ 698 0, /* src_mask */ 699 0xffff, /* dst_mask */ 700 FALSE), /* pcrel_offset */ 701 702 /* Like R_PPC64_SECTOFF, but no overflow warning. */ 703 HOWTO (R_PPC64_SECTOFF_LO, /* type */ 704 0, /* rightshift */ 705 1, /* size (0 = byte, 1 = short, 2 = long) */ 706 16, /* bitsize */ 707 FALSE, /* pc_relative */ 708 0, /* bitpos */ 709 complain_overflow_dont, /* complain_on_overflow */ 710 ppc64_elf_sectoff_reloc, /* special_function */ 711 "R_PPC64_SECTOFF_LO", /* name */ 712 FALSE, /* partial_inplace */ 713 0, /* src_mask */ 714 0xffff, /* dst_mask */ 715 FALSE), /* pcrel_offset */ 716 717 /* 16-bit upper half section relative relocation. */ 718 HOWTO (R_PPC64_SECTOFF_HI, /* type */ 719 16, /* rightshift */ 720 1, /* size (0 = byte, 1 = short, 2 = long) */ 721 16, /* bitsize */ 722 FALSE, /* pc_relative */ 723 0, /* bitpos */ 724 complain_overflow_dont, /* complain_on_overflow */ 725 ppc64_elf_sectoff_reloc, /* special_function */ 726 "R_PPC64_SECTOFF_HI", /* name */ 727 FALSE, /* partial_inplace */ 728 0, /* src_mask */ 729 0xffff, /* dst_mask */ 730 FALSE), /* pcrel_offset */ 731 732 /* 16-bit upper half adjusted section relative relocation. */ 733 HOWTO (R_PPC64_SECTOFF_HA, /* type */ 734 16, /* rightshift */ 735 1, /* size (0 = byte, 1 = short, 2 = long) */ 736 16, /* bitsize */ 737 FALSE, /* pc_relative */ 738 0, /* bitpos */ 739 complain_overflow_dont, /* complain_on_overflow */ 740 ppc64_elf_sectoff_ha_reloc, /* special_function */ 741 "R_PPC64_SECTOFF_HA", /* name */ 742 FALSE, /* partial_inplace */ 743 0, /* src_mask */ 744 0xffff, /* dst_mask */ 745 FALSE), /* pcrel_offset */ 746 747 /* Like R_PPC64_REL24 without touching the two least significant bits. */ 748 HOWTO (R_PPC64_REL30, /* type */ 749 2, /* rightshift */ 750 2, /* size (0 = byte, 1 = short, 2 = long) */ 751 30, /* bitsize */ 752 TRUE, /* pc_relative */ 753 0, /* bitpos */ 754 complain_overflow_dont, /* complain_on_overflow */ 755 bfd_elf_generic_reloc, /* special_function */ 756 "R_PPC64_REL30", /* name */ 757 FALSE, /* partial_inplace */ 758 0, /* src_mask */ 759 0xfffffffc, /* dst_mask */ 760 TRUE), /* pcrel_offset */ 761 762 /* Relocs in the 64-bit PowerPC ELF ABI, not in the 32-bit ABI. */ 763 764 /* A standard 64-bit relocation. */ 765 HOWTO (R_PPC64_ADDR64, /* type */ 766 0, /* rightshift */ 767 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 768 64, /* bitsize */ 769 FALSE, /* pc_relative */ 770 0, /* bitpos */ 771 complain_overflow_dont, /* complain_on_overflow */ 772 bfd_elf_generic_reloc, /* special_function */ 773 "R_PPC64_ADDR64", /* name */ 774 FALSE, /* partial_inplace */ 775 0, /* src_mask */ 776 ONES (64), /* dst_mask */ 777 FALSE), /* pcrel_offset */ 778 779 /* The bits 32-47 of an address. */ 780 HOWTO (R_PPC64_ADDR16_HIGHER, /* type */ 781 32, /* rightshift */ 782 1, /* size (0 = byte, 1 = short, 2 = long) */ 783 16, /* bitsize */ 784 FALSE, /* pc_relative */ 785 0, /* bitpos */ 786 complain_overflow_dont, /* complain_on_overflow */ 787 bfd_elf_generic_reloc, /* special_function */ 788 "R_PPC64_ADDR16_HIGHER", /* name */ 789 FALSE, /* partial_inplace */ 790 0, /* src_mask */ 791 0xffff, /* dst_mask */ 792 FALSE), /* pcrel_offset */ 793 794 /* The bits 32-47 of an address, plus 1 if the contents of the low 795 16 bits, treated as a signed number, is negative. */ 796 HOWTO (R_PPC64_ADDR16_HIGHERA, /* type */ 797 32, /* rightshift */ 798 1, /* size (0 = byte, 1 = short, 2 = long) */ 799 16, /* bitsize */ 800 FALSE, /* pc_relative */ 801 0, /* bitpos */ 802 complain_overflow_dont, /* complain_on_overflow */ 803 ppc64_elf_ha_reloc, /* special_function */ 804 "R_PPC64_ADDR16_HIGHERA", /* name */ 805 FALSE, /* partial_inplace */ 806 0, /* src_mask */ 807 0xffff, /* dst_mask */ 808 FALSE), /* pcrel_offset */ 809 810 /* The bits 48-63 of an address. */ 811 HOWTO (R_PPC64_ADDR16_HIGHEST,/* type */ 812 48, /* rightshift */ 813 1, /* size (0 = byte, 1 = short, 2 = long) */ 814 16, /* bitsize */ 815 FALSE, /* pc_relative */ 816 0, /* bitpos */ 817 complain_overflow_dont, /* complain_on_overflow */ 818 bfd_elf_generic_reloc, /* special_function */ 819 "R_PPC64_ADDR16_HIGHEST", /* name */ 820 FALSE, /* partial_inplace */ 821 0, /* src_mask */ 822 0xffff, /* dst_mask */ 823 FALSE), /* pcrel_offset */ 824 825 /* The bits 48-63 of an address, plus 1 if the contents of the low 826 16 bits, treated as a signed number, is negative. */ 827 HOWTO (R_PPC64_ADDR16_HIGHESTA,/* type */ 828 48, /* rightshift */ 829 1, /* size (0 = byte, 1 = short, 2 = long) */ 830 16, /* bitsize */ 831 FALSE, /* pc_relative */ 832 0, /* bitpos */ 833 complain_overflow_dont, /* complain_on_overflow */ 834 ppc64_elf_ha_reloc, /* special_function */ 835 "R_PPC64_ADDR16_HIGHESTA", /* name */ 836 FALSE, /* partial_inplace */ 837 0, /* src_mask */ 838 0xffff, /* dst_mask */ 839 FALSE), /* pcrel_offset */ 840 841 /* Like ADDR64, but may be unaligned. */ 842 HOWTO (R_PPC64_UADDR64, /* type */ 843 0, /* rightshift */ 844 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 845 64, /* bitsize */ 846 FALSE, /* pc_relative */ 847 0, /* bitpos */ 848 complain_overflow_dont, /* complain_on_overflow */ 849 bfd_elf_generic_reloc, /* special_function */ 850 "R_PPC64_UADDR64", /* name */ 851 FALSE, /* partial_inplace */ 852 0, /* src_mask */ 853 ONES (64), /* dst_mask */ 854 FALSE), /* pcrel_offset */ 855 856 /* 64-bit relative relocation. */ 857 HOWTO (R_PPC64_REL64, /* type */ 858 0, /* rightshift */ 859 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 860 64, /* bitsize */ 861 TRUE, /* pc_relative */ 862 0, /* bitpos */ 863 complain_overflow_dont, /* complain_on_overflow */ 864 bfd_elf_generic_reloc, /* special_function */ 865 "R_PPC64_REL64", /* name */ 866 FALSE, /* partial_inplace */ 867 0, /* src_mask */ 868 ONES (64), /* dst_mask */ 869 TRUE), /* pcrel_offset */ 870 871 /* 64-bit relocation to the symbol's procedure linkage table. */ 872 HOWTO (R_PPC64_PLT64, /* type */ 873 0, /* rightshift */ 874 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 875 64, /* bitsize */ 876 FALSE, /* pc_relative */ 877 0, /* bitpos */ 878 complain_overflow_dont, /* complain_on_overflow */ 879 ppc64_elf_unhandled_reloc, /* special_function */ 880 "R_PPC64_PLT64", /* name */ 881 FALSE, /* partial_inplace */ 882 0, /* src_mask */ 883 ONES (64), /* dst_mask */ 884 FALSE), /* pcrel_offset */ 885 886 /* 64-bit PC relative relocation to the symbol's procedure linkage 887 table. */ 888 /* FIXME: R_PPC64_PLTREL64 not supported. */ 889 HOWTO (R_PPC64_PLTREL64, /* type */ 890 0, /* rightshift */ 891 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 892 64, /* bitsize */ 893 TRUE, /* pc_relative */ 894 0, /* bitpos */ 895 complain_overflow_dont, /* complain_on_overflow */ 896 ppc64_elf_unhandled_reloc, /* special_function */ 897 "R_PPC64_PLTREL64", /* name */ 898 FALSE, /* partial_inplace */ 899 0, /* src_mask */ 900 ONES (64), /* dst_mask */ 901 TRUE), /* pcrel_offset */ 902 903 /* 16 bit TOC-relative relocation. */ 904 905 /* R_PPC64_TOC16 47 half16* S + A - .TOC. */ 906 HOWTO (R_PPC64_TOC16, /* type */ 907 0, /* rightshift */ 908 1, /* size (0 = byte, 1 = short, 2 = long) */ 909 16, /* bitsize */ 910 FALSE, /* pc_relative */ 911 0, /* bitpos */ 912 complain_overflow_signed, /* complain_on_overflow */ 913 ppc64_elf_toc_reloc, /* special_function */ 914 "R_PPC64_TOC16", /* name */ 915 FALSE, /* partial_inplace */ 916 0, /* src_mask */ 917 0xffff, /* dst_mask */ 918 FALSE), /* pcrel_offset */ 919 920 /* 16 bit TOC-relative relocation without overflow. */ 921 922 /* R_PPC64_TOC16_LO 48 half16 #lo (S + A - .TOC.) */ 923 HOWTO (R_PPC64_TOC16_LO, /* type */ 924 0, /* rightshift */ 925 1, /* size (0 = byte, 1 = short, 2 = long) */ 926 16, /* bitsize */ 927 FALSE, /* pc_relative */ 928 0, /* bitpos */ 929 complain_overflow_dont, /* complain_on_overflow */ 930 ppc64_elf_toc_reloc, /* special_function */ 931 "R_PPC64_TOC16_LO", /* name */ 932 FALSE, /* partial_inplace */ 933 0, /* src_mask */ 934 0xffff, /* dst_mask */ 935 FALSE), /* pcrel_offset */ 936 937 /* 16 bit TOC-relative relocation, high 16 bits. */ 938 939 /* R_PPC64_TOC16_HI 49 half16 #hi (S + A - .TOC.) */ 940 HOWTO (R_PPC64_TOC16_HI, /* type */ 941 16, /* rightshift */ 942 1, /* size (0 = byte, 1 = short, 2 = long) */ 943 16, /* bitsize */ 944 FALSE, /* pc_relative */ 945 0, /* bitpos */ 946 complain_overflow_dont, /* complain_on_overflow */ 947 ppc64_elf_toc_reloc, /* special_function */ 948 "R_PPC64_TOC16_HI", /* name */ 949 FALSE, /* partial_inplace */ 950 0, /* src_mask */ 951 0xffff, /* dst_mask */ 952 FALSE), /* pcrel_offset */ 953 954 /* 16 bit TOC-relative relocation, high 16 bits, plus 1 if the 955 contents of the low 16 bits, treated as a signed number, is 956 negative. */ 957 958 /* R_PPC64_TOC16_HA 50 half16 #ha (S + A - .TOC.) */ 959 HOWTO (R_PPC64_TOC16_HA, /* type */ 960 16, /* rightshift */ 961 1, /* size (0 = byte, 1 = short, 2 = long) */ 962 16, /* bitsize */ 963 FALSE, /* pc_relative */ 964 0, /* bitpos */ 965 complain_overflow_dont, /* complain_on_overflow */ 966 ppc64_elf_toc_ha_reloc, /* special_function */ 967 "R_PPC64_TOC16_HA", /* name */ 968 FALSE, /* partial_inplace */ 969 0, /* src_mask */ 970 0xffff, /* dst_mask */ 971 FALSE), /* pcrel_offset */ 972 973 /* 64-bit relocation; insert value of TOC base (.TOC.). */ 974 975 /* R_PPC64_TOC 51 doubleword64 .TOC. */ 976 HOWTO (R_PPC64_TOC, /* type */ 977 0, /* rightshift */ 978 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 979 64, /* bitsize */ 980 FALSE, /* pc_relative */ 981 0, /* bitpos */ 982 complain_overflow_bitfield, /* complain_on_overflow */ 983 ppc64_elf_toc64_reloc, /* special_function */ 984 "R_PPC64_TOC", /* name */ 985 FALSE, /* partial_inplace */ 986 0, /* src_mask */ 987 ONES (64), /* dst_mask */ 988 FALSE), /* pcrel_offset */ 989 990 /* Like R_PPC64_GOT16, but also informs the link editor that the 991 value to relocate may (!) refer to a PLT entry which the link 992 editor (a) may replace with the symbol value. If the link editor 993 is unable to fully resolve the symbol, it may (b) create a PLT 994 entry and store the address to the new PLT entry in the GOT. 995 This permits lazy resolution of function symbols at run time. 996 The link editor may also skip all of this and just (c) emit a 997 R_PPC64_GLOB_DAT to tie the symbol to the GOT entry. */ 998 /* FIXME: R_PPC64_PLTGOT16 not implemented. */ 999 HOWTO (R_PPC64_PLTGOT16, /* type */ 1000 0, /* rightshift */ 1001 1, /* size (0 = byte, 1 = short, 2 = long) */ 1002 16, /* bitsize */ 1003 FALSE, /* pc_relative */ 1004 0, /* bitpos */ 1005 complain_overflow_signed, /* complain_on_overflow */ 1006 ppc64_elf_unhandled_reloc, /* special_function */ 1007 "R_PPC64_PLTGOT16", /* name */ 1008 FALSE, /* partial_inplace */ 1009 0, /* src_mask */ 1010 0xffff, /* dst_mask */ 1011 FALSE), /* pcrel_offset */ 1012 1013 /* Like R_PPC64_PLTGOT16, but without overflow. */ 1014 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */ 1015 HOWTO (R_PPC64_PLTGOT16_LO, /* type */ 1016 0, /* rightshift */ 1017 1, /* size (0 = byte, 1 = short, 2 = long) */ 1018 16, /* bitsize */ 1019 FALSE, /* pc_relative */ 1020 0, /* bitpos */ 1021 complain_overflow_dont, /* complain_on_overflow */ 1022 ppc64_elf_unhandled_reloc, /* special_function */ 1023 "R_PPC64_PLTGOT16_LO", /* name */ 1024 FALSE, /* partial_inplace */ 1025 0, /* src_mask */ 1026 0xffff, /* dst_mask */ 1027 FALSE), /* pcrel_offset */ 1028 1029 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address. */ 1030 /* FIXME: R_PPC64_PLTGOT16_HI not implemented. */ 1031 HOWTO (R_PPC64_PLTGOT16_HI, /* type */ 1032 16, /* rightshift */ 1033 1, /* size (0 = byte, 1 = short, 2 = long) */ 1034 16, /* bitsize */ 1035 FALSE, /* pc_relative */ 1036 0, /* bitpos */ 1037 complain_overflow_dont, /* complain_on_overflow */ 1038 ppc64_elf_unhandled_reloc, /* special_function */ 1039 "R_PPC64_PLTGOT16_HI", /* name */ 1040 FALSE, /* partial_inplace */ 1041 0, /* src_mask */ 1042 0xffff, /* dst_mask */ 1043 FALSE), /* pcrel_offset */ 1044 1045 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address, plus 1046 1 if the contents of the low 16 bits, treated as a signed number, 1047 is negative. */ 1048 /* FIXME: R_PPC64_PLTGOT16_HA not implemented. */ 1049 HOWTO (R_PPC64_PLTGOT16_HA, /* type */ 1050 16, /* rightshift */ 1051 1, /* size (0 = byte, 1 = short, 2 = long) */ 1052 16, /* bitsize */ 1053 FALSE, /* pc_relative */ 1054 0, /* bitpos */ 1055 complain_overflow_dont,/* complain_on_overflow */ 1056 ppc64_elf_unhandled_reloc, /* special_function */ 1057 "R_PPC64_PLTGOT16_HA", /* name */ 1058 FALSE, /* partial_inplace */ 1059 0, /* src_mask */ 1060 0xffff, /* dst_mask */ 1061 FALSE), /* pcrel_offset */ 1062 1063 /* Like R_PPC64_ADDR16, but for instructions with a DS field. */ 1064 HOWTO (R_PPC64_ADDR16_DS, /* type */ 1065 0, /* rightshift */ 1066 1, /* size (0 = byte, 1 = short, 2 = long) */ 1067 16, /* bitsize */ 1068 FALSE, /* pc_relative */ 1069 0, /* bitpos */ 1070 complain_overflow_bitfield, /* complain_on_overflow */ 1071 bfd_elf_generic_reloc, /* special_function */ 1072 "R_PPC64_ADDR16_DS", /* name */ 1073 FALSE, /* partial_inplace */ 1074 0, /* src_mask */ 1075 0xfffc, /* dst_mask */ 1076 FALSE), /* pcrel_offset */ 1077 1078 /* Like R_PPC64_ADDR16_LO, but for instructions with a DS field. */ 1079 HOWTO (R_PPC64_ADDR16_LO_DS, /* type */ 1080 0, /* rightshift */ 1081 1, /* size (0 = byte, 1 = short, 2 = long) */ 1082 16, /* bitsize */ 1083 FALSE, /* pc_relative */ 1084 0, /* bitpos */ 1085 complain_overflow_dont,/* complain_on_overflow */ 1086 bfd_elf_generic_reloc, /* special_function */ 1087 "R_PPC64_ADDR16_LO_DS",/* name */ 1088 FALSE, /* partial_inplace */ 1089 0, /* src_mask */ 1090 0xfffc, /* dst_mask */ 1091 FALSE), /* pcrel_offset */ 1092 1093 /* Like R_PPC64_GOT16, but for instructions with a DS field. */ 1094 HOWTO (R_PPC64_GOT16_DS, /* type */ 1095 0, /* rightshift */ 1096 1, /* size (0 = byte, 1 = short, 2 = long) */ 1097 16, /* bitsize */ 1098 FALSE, /* pc_relative */ 1099 0, /* bitpos */ 1100 complain_overflow_signed, /* complain_on_overflow */ 1101 ppc64_elf_unhandled_reloc, /* special_function */ 1102 "R_PPC64_GOT16_DS", /* name */ 1103 FALSE, /* partial_inplace */ 1104 0, /* src_mask */ 1105 0xfffc, /* dst_mask */ 1106 FALSE), /* pcrel_offset */ 1107 1108 /* Like R_PPC64_GOT16_LO, but for instructions with a DS field. */ 1109 HOWTO (R_PPC64_GOT16_LO_DS, /* type */ 1110 0, /* rightshift */ 1111 1, /* size (0 = byte, 1 = short, 2 = long) */ 1112 16, /* bitsize */ 1113 FALSE, /* pc_relative */ 1114 0, /* bitpos */ 1115 complain_overflow_dont, /* complain_on_overflow */ 1116 ppc64_elf_unhandled_reloc, /* special_function */ 1117 "R_PPC64_GOT16_LO_DS", /* name */ 1118 FALSE, /* partial_inplace */ 1119 0, /* src_mask */ 1120 0xfffc, /* dst_mask */ 1121 FALSE), /* pcrel_offset */ 1122 1123 /* Like R_PPC64_PLT16_LO, but for instructions with a DS field. */ 1124 HOWTO (R_PPC64_PLT16_LO_DS, /* type */ 1125 0, /* rightshift */ 1126 1, /* size (0 = byte, 1 = short, 2 = long) */ 1127 16, /* bitsize */ 1128 FALSE, /* pc_relative */ 1129 0, /* bitpos */ 1130 complain_overflow_dont, /* complain_on_overflow */ 1131 ppc64_elf_unhandled_reloc, /* special_function */ 1132 "R_PPC64_PLT16_LO_DS", /* name */ 1133 FALSE, /* partial_inplace */ 1134 0, /* src_mask */ 1135 0xfffc, /* dst_mask */ 1136 FALSE), /* pcrel_offset */ 1137 1138 /* Like R_PPC64_SECTOFF, but for instructions with a DS field. */ 1139 HOWTO (R_PPC64_SECTOFF_DS, /* type */ 1140 0, /* rightshift */ 1141 1, /* size (0 = byte, 1 = short, 2 = long) */ 1142 16, /* bitsize */ 1143 FALSE, /* pc_relative */ 1144 0, /* bitpos */ 1145 complain_overflow_bitfield, /* complain_on_overflow */ 1146 ppc64_elf_sectoff_reloc, /* special_function */ 1147 "R_PPC64_SECTOFF_DS", /* name */ 1148 FALSE, /* partial_inplace */ 1149 0, /* src_mask */ 1150 0xfffc, /* dst_mask */ 1151 FALSE), /* pcrel_offset */ 1152 1153 /* Like R_PPC64_SECTOFF_LO, but for instructions with a DS field. */ 1154 HOWTO (R_PPC64_SECTOFF_LO_DS, /* type */ 1155 0, /* rightshift */ 1156 1, /* size (0 = byte, 1 = short, 2 = long) */ 1157 16, /* bitsize */ 1158 FALSE, /* pc_relative */ 1159 0, /* bitpos */ 1160 complain_overflow_dont, /* complain_on_overflow */ 1161 ppc64_elf_sectoff_reloc, /* special_function */ 1162 "R_PPC64_SECTOFF_LO_DS",/* name */ 1163 FALSE, /* partial_inplace */ 1164 0, /* src_mask */ 1165 0xfffc, /* dst_mask */ 1166 FALSE), /* pcrel_offset */ 1167 1168 /* Like R_PPC64_TOC16, but for instructions with a DS field. */ 1169 HOWTO (R_PPC64_TOC16_DS, /* type */ 1170 0, /* rightshift */ 1171 1, /* size (0 = byte, 1 = short, 2 = long) */ 1172 16, /* bitsize */ 1173 FALSE, /* pc_relative */ 1174 0, /* bitpos */ 1175 complain_overflow_signed, /* complain_on_overflow */ 1176 ppc64_elf_toc_reloc, /* special_function */ 1177 "R_PPC64_TOC16_DS", /* name */ 1178 FALSE, /* partial_inplace */ 1179 0, /* src_mask */ 1180 0xfffc, /* dst_mask */ 1181 FALSE), /* pcrel_offset */ 1182 1183 /* Like R_PPC64_TOC16_LO, but for instructions with a DS field. */ 1184 HOWTO (R_PPC64_TOC16_LO_DS, /* type */ 1185 0, /* rightshift */ 1186 1, /* size (0 = byte, 1 = short, 2 = long) */ 1187 16, /* bitsize */ 1188 FALSE, /* pc_relative */ 1189 0, /* bitpos */ 1190 complain_overflow_dont, /* complain_on_overflow */ 1191 ppc64_elf_toc_reloc, /* special_function */ 1192 "R_PPC64_TOC16_LO_DS", /* name */ 1193 FALSE, /* partial_inplace */ 1194 0, /* src_mask */ 1195 0xfffc, /* dst_mask */ 1196 FALSE), /* pcrel_offset */ 1197 1198 /* Like R_PPC64_PLTGOT16, but for instructions with a DS field. */ 1199 /* FIXME: R_PPC64_PLTGOT16_DS not implemented. */ 1200 HOWTO (R_PPC64_PLTGOT16_DS, /* type */ 1201 0, /* rightshift */ 1202 1, /* size (0 = byte, 1 = short, 2 = long) */ 1203 16, /* bitsize */ 1204 FALSE, /* pc_relative */ 1205 0, /* bitpos */ 1206 complain_overflow_signed, /* complain_on_overflow */ 1207 ppc64_elf_unhandled_reloc, /* special_function */ 1208 "R_PPC64_PLTGOT16_DS", /* name */ 1209 FALSE, /* partial_inplace */ 1210 0, /* src_mask */ 1211 0xfffc, /* dst_mask */ 1212 FALSE), /* pcrel_offset */ 1213 1214 /* Like R_PPC64_PLTGOT16_LO, but for instructions with a DS field. */ 1215 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */ 1216 HOWTO (R_PPC64_PLTGOT16_LO_DS,/* type */ 1217 0, /* rightshift */ 1218 1, /* size (0 = byte, 1 = short, 2 = long) */ 1219 16, /* bitsize */ 1220 FALSE, /* pc_relative */ 1221 0, /* bitpos */ 1222 complain_overflow_dont, /* complain_on_overflow */ 1223 ppc64_elf_unhandled_reloc, /* special_function */ 1224 "R_PPC64_PLTGOT16_LO_DS",/* name */ 1225 FALSE, /* partial_inplace */ 1226 0, /* src_mask */ 1227 0xfffc, /* dst_mask */ 1228 FALSE), /* pcrel_offset */ 1229 1230 /* Marker reloc for TLS. */ 1231 HOWTO (R_PPC64_TLS, 1232 0, /* rightshift */ 1233 2, /* size (0 = byte, 1 = short, 2 = long) */ 1234 32, /* bitsize */ 1235 FALSE, /* pc_relative */ 1236 0, /* bitpos */ 1237 complain_overflow_dont, /* complain_on_overflow */ 1238 bfd_elf_generic_reloc, /* special_function */ 1239 "R_PPC64_TLS", /* name */ 1240 FALSE, /* partial_inplace */ 1241 0, /* src_mask */ 1242 0, /* dst_mask */ 1243 FALSE), /* pcrel_offset */ 1244 1245 /* Computes the load module index of the load module that contains the 1246 definition of its TLS sym. */ 1247 HOWTO (R_PPC64_DTPMOD64, 1248 0, /* rightshift */ 1249 4, /* size (0 = byte, 1 = short, 2 = long) */ 1250 64, /* bitsize */ 1251 FALSE, /* pc_relative */ 1252 0, /* bitpos */ 1253 complain_overflow_dont, /* complain_on_overflow */ 1254 ppc64_elf_unhandled_reloc, /* special_function */ 1255 "R_PPC64_DTPMOD64", /* name */ 1256 FALSE, /* partial_inplace */ 1257 0, /* src_mask */ 1258 ONES (64), /* dst_mask */ 1259 FALSE), /* pcrel_offset */ 1260 1261 /* Computes a dtv-relative displacement, the difference between the value 1262 of sym+add and the base address of the thread-local storage block that 1263 contains the definition of sym, minus 0x8000. */ 1264 HOWTO (R_PPC64_DTPREL64, 1265 0, /* rightshift */ 1266 4, /* size (0 = byte, 1 = short, 2 = long) */ 1267 64, /* bitsize */ 1268 FALSE, /* pc_relative */ 1269 0, /* bitpos */ 1270 complain_overflow_dont, /* complain_on_overflow */ 1271 ppc64_elf_unhandled_reloc, /* special_function */ 1272 "R_PPC64_DTPREL64", /* name */ 1273 FALSE, /* partial_inplace */ 1274 0, /* src_mask */ 1275 ONES (64), /* dst_mask */ 1276 FALSE), /* pcrel_offset */ 1277 1278 /* A 16 bit dtprel reloc. */ 1279 HOWTO (R_PPC64_DTPREL16, 1280 0, /* rightshift */ 1281 1, /* size (0 = byte, 1 = short, 2 = long) */ 1282 16, /* bitsize */ 1283 FALSE, /* pc_relative */ 1284 0, /* bitpos */ 1285 complain_overflow_signed, /* complain_on_overflow */ 1286 ppc64_elf_unhandled_reloc, /* special_function */ 1287 "R_PPC64_DTPREL16", /* name */ 1288 FALSE, /* partial_inplace */ 1289 0, /* src_mask */ 1290 0xffff, /* dst_mask */ 1291 FALSE), /* pcrel_offset */ 1292 1293 /* Like DTPREL16, but no overflow. */ 1294 HOWTO (R_PPC64_DTPREL16_LO, 1295 0, /* rightshift */ 1296 1, /* size (0 = byte, 1 = short, 2 = long) */ 1297 16, /* bitsize */ 1298 FALSE, /* pc_relative */ 1299 0, /* bitpos */ 1300 complain_overflow_dont, /* complain_on_overflow */ 1301 ppc64_elf_unhandled_reloc, /* special_function */ 1302 "R_PPC64_DTPREL16_LO", /* name */ 1303 FALSE, /* partial_inplace */ 1304 0, /* src_mask */ 1305 0xffff, /* dst_mask */ 1306 FALSE), /* pcrel_offset */ 1307 1308 /* Like DTPREL16_LO, but next higher group of 16 bits. */ 1309 HOWTO (R_PPC64_DTPREL16_HI, 1310 16, /* rightshift */ 1311 1, /* size (0 = byte, 1 = short, 2 = long) */ 1312 16, /* bitsize */ 1313 FALSE, /* pc_relative */ 1314 0, /* bitpos */ 1315 complain_overflow_dont, /* complain_on_overflow */ 1316 ppc64_elf_unhandled_reloc, /* special_function */ 1317 "R_PPC64_DTPREL16_HI", /* name */ 1318 FALSE, /* partial_inplace */ 1319 0, /* src_mask */ 1320 0xffff, /* dst_mask */ 1321 FALSE), /* pcrel_offset */ 1322 1323 /* Like DTPREL16_HI, but adjust for low 16 bits. */ 1324 HOWTO (R_PPC64_DTPREL16_HA, 1325 16, /* rightshift */ 1326 1, /* size (0 = byte, 1 = short, 2 = long) */ 1327 16, /* bitsize */ 1328 FALSE, /* pc_relative */ 1329 0, /* bitpos */ 1330 complain_overflow_dont, /* complain_on_overflow */ 1331 ppc64_elf_unhandled_reloc, /* special_function */ 1332 "R_PPC64_DTPREL16_HA", /* name */ 1333 FALSE, /* partial_inplace */ 1334 0, /* src_mask */ 1335 0xffff, /* dst_mask */ 1336 FALSE), /* pcrel_offset */ 1337 1338 /* Like DTPREL16_HI, but next higher group of 16 bits. */ 1339 HOWTO (R_PPC64_DTPREL16_HIGHER, 1340 32, /* rightshift */ 1341 1, /* size (0 = byte, 1 = short, 2 = long) */ 1342 16, /* bitsize */ 1343 FALSE, /* pc_relative */ 1344 0, /* bitpos */ 1345 complain_overflow_dont, /* complain_on_overflow */ 1346 ppc64_elf_unhandled_reloc, /* special_function */ 1347 "R_PPC64_DTPREL16_HIGHER", /* name */ 1348 FALSE, /* partial_inplace */ 1349 0, /* src_mask */ 1350 0xffff, /* dst_mask */ 1351 FALSE), /* pcrel_offset */ 1352 1353 /* Like DTPREL16_HIGHER, but adjust for low 16 bits. */ 1354 HOWTO (R_PPC64_DTPREL16_HIGHERA, 1355 32, /* rightshift */ 1356 1, /* size (0 = byte, 1 = short, 2 = long) */ 1357 16, /* bitsize */ 1358 FALSE, /* pc_relative */ 1359 0, /* bitpos */ 1360 complain_overflow_dont, /* complain_on_overflow */ 1361 ppc64_elf_unhandled_reloc, /* special_function */ 1362 "R_PPC64_DTPREL16_HIGHERA", /* name */ 1363 FALSE, /* partial_inplace */ 1364 0, /* src_mask */ 1365 0xffff, /* dst_mask */ 1366 FALSE), /* pcrel_offset */ 1367 1368 /* Like DTPREL16_HIGHER, but next higher group of 16 bits. */ 1369 HOWTO (R_PPC64_DTPREL16_HIGHEST, 1370 48, /* rightshift */ 1371 1, /* size (0 = byte, 1 = short, 2 = long) */ 1372 16, /* bitsize */ 1373 FALSE, /* pc_relative */ 1374 0, /* bitpos */ 1375 complain_overflow_dont, /* complain_on_overflow */ 1376 ppc64_elf_unhandled_reloc, /* special_function */ 1377 "R_PPC64_DTPREL16_HIGHEST", /* name */ 1378 FALSE, /* partial_inplace */ 1379 0, /* src_mask */ 1380 0xffff, /* dst_mask */ 1381 FALSE), /* pcrel_offset */ 1382 1383 /* Like DTPREL16_HIGHEST, but adjust for low 16 bits. */ 1384 HOWTO (R_PPC64_DTPREL16_HIGHESTA, 1385 48, /* rightshift */ 1386 1, /* size (0 = byte, 1 = short, 2 = long) */ 1387 16, /* bitsize */ 1388 FALSE, /* pc_relative */ 1389 0, /* bitpos */ 1390 complain_overflow_dont, /* complain_on_overflow */ 1391 ppc64_elf_unhandled_reloc, /* special_function */ 1392 "R_PPC64_DTPREL16_HIGHESTA", /* name */ 1393 FALSE, /* partial_inplace */ 1394 0, /* src_mask */ 1395 0xffff, /* dst_mask */ 1396 FALSE), /* pcrel_offset */ 1397 1398 /* Like DTPREL16, but for insns with a DS field. */ 1399 HOWTO (R_PPC64_DTPREL16_DS, 1400 0, /* rightshift */ 1401 1, /* size (0 = byte, 1 = short, 2 = long) */ 1402 16, /* bitsize */ 1403 FALSE, /* pc_relative */ 1404 0, /* bitpos */ 1405 complain_overflow_signed, /* complain_on_overflow */ 1406 ppc64_elf_unhandled_reloc, /* special_function */ 1407 "R_PPC64_DTPREL16_DS", /* name */ 1408 FALSE, /* partial_inplace */ 1409 0, /* src_mask */ 1410 0xfffc, /* dst_mask */ 1411 FALSE), /* pcrel_offset */ 1412 1413 /* Like DTPREL16_DS, but no overflow. */ 1414 HOWTO (R_PPC64_DTPREL16_LO_DS, 1415 0, /* rightshift */ 1416 1, /* size (0 = byte, 1 = short, 2 = long) */ 1417 16, /* bitsize */ 1418 FALSE, /* pc_relative */ 1419 0, /* bitpos */ 1420 complain_overflow_dont, /* complain_on_overflow */ 1421 ppc64_elf_unhandled_reloc, /* special_function */ 1422 "R_PPC64_DTPREL16_LO_DS", /* name */ 1423 FALSE, /* partial_inplace */ 1424 0, /* src_mask */ 1425 0xfffc, /* dst_mask */ 1426 FALSE), /* pcrel_offset */ 1427 1428 /* Computes a tp-relative displacement, the difference between the value of 1429 sym+add and the value of the thread pointer (r13). */ 1430 HOWTO (R_PPC64_TPREL64, 1431 0, /* rightshift */ 1432 4, /* size (0 = byte, 1 = short, 2 = long) */ 1433 64, /* bitsize */ 1434 FALSE, /* pc_relative */ 1435 0, /* bitpos */ 1436 complain_overflow_dont, /* complain_on_overflow */ 1437 ppc64_elf_unhandled_reloc, /* special_function */ 1438 "R_PPC64_TPREL64", /* name */ 1439 FALSE, /* partial_inplace */ 1440 0, /* src_mask */ 1441 ONES (64), /* dst_mask */ 1442 FALSE), /* pcrel_offset */ 1443 1444 /* A 16 bit tprel reloc. */ 1445 HOWTO (R_PPC64_TPREL16, 1446 0, /* rightshift */ 1447 1, /* size (0 = byte, 1 = short, 2 = long) */ 1448 16, /* bitsize */ 1449 FALSE, /* pc_relative */ 1450 0, /* bitpos */ 1451 complain_overflow_signed, /* complain_on_overflow */ 1452 ppc64_elf_unhandled_reloc, /* special_function */ 1453 "R_PPC64_TPREL16", /* name */ 1454 FALSE, /* partial_inplace */ 1455 0, /* src_mask */ 1456 0xffff, /* dst_mask */ 1457 FALSE), /* pcrel_offset */ 1458 1459 /* Like TPREL16, but no overflow. */ 1460 HOWTO (R_PPC64_TPREL16_LO, 1461 0, /* rightshift */ 1462 1, /* size (0 = byte, 1 = short, 2 = long) */ 1463 16, /* bitsize */ 1464 FALSE, /* pc_relative */ 1465 0, /* bitpos */ 1466 complain_overflow_dont, /* complain_on_overflow */ 1467 ppc64_elf_unhandled_reloc, /* special_function */ 1468 "R_PPC64_TPREL16_LO", /* name */ 1469 FALSE, /* partial_inplace */ 1470 0, /* src_mask */ 1471 0xffff, /* dst_mask */ 1472 FALSE), /* pcrel_offset */ 1473 1474 /* Like TPREL16_LO, but next higher group of 16 bits. */ 1475 HOWTO (R_PPC64_TPREL16_HI, 1476 16, /* rightshift */ 1477 1, /* size (0 = byte, 1 = short, 2 = long) */ 1478 16, /* bitsize */ 1479 FALSE, /* pc_relative */ 1480 0, /* bitpos */ 1481 complain_overflow_dont, /* complain_on_overflow */ 1482 ppc64_elf_unhandled_reloc, /* special_function */ 1483 "R_PPC64_TPREL16_HI", /* name */ 1484 FALSE, /* partial_inplace */ 1485 0, /* src_mask */ 1486 0xffff, /* dst_mask */ 1487 FALSE), /* pcrel_offset */ 1488 1489 /* Like TPREL16_HI, but adjust for low 16 bits. */ 1490 HOWTO (R_PPC64_TPREL16_HA, 1491 16, /* rightshift */ 1492 1, /* size (0 = byte, 1 = short, 2 = long) */ 1493 16, /* bitsize */ 1494 FALSE, /* pc_relative */ 1495 0, /* bitpos */ 1496 complain_overflow_dont, /* complain_on_overflow */ 1497 ppc64_elf_unhandled_reloc, /* special_function */ 1498 "R_PPC64_TPREL16_HA", /* name */ 1499 FALSE, /* partial_inplace */ 1500 0, /* src_mask */ 1501 0xffff, /* dst_mask */ 1502 FALSE), /* pcrel_offset */ 1503 1504 /* Like TPREL16_HI, but next higher group of 16 bits. */ 1505 HOWTO (R_PPC64_TPREL16_HIGHER, 1506 32, /* rightshift */ 1507 1, /* size (0 = byte, 1 = short, 2 = long) */ 1508 16, /* bitsize */ 1509 FALSE, /* pc_relative */ 1510 0, /* bitpos */ 1511 complain_overflow_dont, /* complain_on_overflow */ 1512 ppc64_elf_unhandled_reloc, /* special_function */ 1513 "R_PPC64_TPREL16_HIGHER", /* name */ 1514 FALSE, /* partial_inplace */ 1515 0, /* src_mask */ 1516 0xffff, /* dst_mask */ 1517 FALSE), /* pcrel_offset */ 1518 1519 /* Like TPREL16_HIGHER, but adjust for low 16 bits. */ 1520 HOWTO (R_PPC64_TPREL16_HIGHERA, 1521 32, /* rightshift */ 1522 1, /* size (0 = byte, 1 = short, 2 = long) */ 1523 16, /* bitsize */ 1524 FALSE, /* pc_relative */ 1525 0, /* bitpos */ 1526 complain_overflow_dont, /* complain_on_overflow */ 1527 ppc64_elf_unhandled_reloc, /* special_function */ 1528 "R_PPC64_TPREL16_HIGHERA", /* name */ 1529 FALSE, /* partial_inplace */ 1530 0, /* src_mask */ 1531 0xffff, /* dst_mask */ 1532 FALSE), /* pcrel_offset */ 1533 1534 /* Like TPREL16_HIGHER, but next higher group of 16 bits. */ 1535 HOWTO (R_PPC64_TPREL16_HIGHEST, 1536 48, /* rightshift */ 1537 1, /* size (0 = byte, 1 = short, 2 = long) */ 1538 16, /* bitsize */ 1539 FALSE, /* pc_relative */ 1540 0, /* bitpos */ 1541 complain_overflow_dont, /* complain_on_overflow */ 1542 ppc64_elf_unhandled_reloc, /* special_function */ 1543 "R_PPC64_TPREL16_HIGHEST", /* name */ 1544 FALSE, /* partial_inplace */ 1545 0, /* src_mask */ 1546 0xffff, /* dst_mask */ 1547 FALSE), /* pcrel_offset */ 1548 1549 /* Like TPREL16_HIGHEST, but adjust for low 16 bits. */ 1550 HOWTO (R_PPC64_TPREL16_HIGHESTA, 1551 48, /* rightshift */ 1552 1, /* size (0 = byte, 1 = short, 2 = long) */ 1553 16, /* bitsize */ 1554 FALSE, /* pc_relative */ 1555 0, /* bitpos */ 1556 complain_overflow_dont, /* complain_on_overflow */ 1557 ppc64_elf_unhandled_reloc, /* special_function */ 1558 "R_PPC64_TPREL16_HIGHESTA", /* name */ 1559 FALSE, /* partial_inplace */ 1560 0, /* src_mask */ 1561 0xffff, /* dst_mask */ 1562 FALSE), /* pcrel_offset */ 1563 1564 /* Like TPREL16, but for insns with a DS field. */ 1565 HOWTO (R_PPC64_TPREL16_DS, 1566 0, /* rightshift */ 1567 1, /* size (0 = byte, 1 = short, 2 = long) */ 1568 16, /* bitsize */ 1569 FALSE, /* pc_relative */ 1570 0, /* bitpos */ 1571 complain_overflow_signed, /* complain_on_overflow */ 1572 ppc64_elf_unhandled_reloc, /* special_function */ 1573 "R_PPC64_TPREL16_DS", /* name */ 1574 FALSE, /* partial_inplace */ 1575 0, /* src_mask */ 1576 0xfffc, /* dst_mask */ 1577 FALSE), /* pcrel_offset */ 1578 1579 /* Like TPREL16_DS, but no overflow. */ 1580 HOWTO (R_PPC64_TPREL16_LO_DS, 1581 0, /* rightshift */ 1582 1, /* size (0 = byte, 1 = short, 2 = long) */ 1583 16, /* bitsize */ 1584 FALSE, /* pc_relative */ 1585 0, /* bitpos */ 1586 complain_overflow_dont, /* complain_on_overflow */ 1587 ppc64_elf_unhandled_reloc, /* special_function */ 1588 "R_PPC64_TPREL16_LO_DS", /* name */ 1589 FALSE, /* partial_inplace */ 1590 0, /* src_mask */ 1591 0xfffc, /* dst_mask */ 1592 FALSE), /* pcrel_offset */ 1593 1594 /* Allocates two contiguous entries in the GOT to hold a tls_index structure, 1595 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset 1596 to the first entry relative to the TOC base (r2). */ 1597 HOWTO (R_PPC64_GOT_TLSGD16, 1598 0, /* rightshift */ 1599 1, /* size (0 = byte, 1 = short, 2 = long) */ 1600 16, /* bitsize */ 1601 FALSE, /* pc_relative */ 1602 0, /* bitpos */ 1603 complain_overflow_signed, /* complain_on_overflow */ 1604 ppc64_elf_unhandled_reloc, /* special_function */ 1605 "R_PPC64_GOT_TLSGD16", /* name */ 1606 FALSE, /* partial_inplace */ 1607 0, /* src_mask */ 1608 0xffff, /* dst_mask */ 1609 FALSE), /* pcrel_offset */ 1610 1611 /* Like GOT_TLSGD16, but no overflow. */ 1612 HOWTO (R_PPC64_GOT_TLSGD16_LO, 1613 0, /* rightshift */ 1614 1, /* size (0 = byte, 1 = short, 2 = long) */ 1615 16, /* bitsize */ 1616 FALSE, /* pc_relative */ 1617 0, /* bitpos */ 1618 complain_overflow_dont, /* complain_on_overflow */ 1619 ppc64_elf_unhandled_reloc, /* special_function */ 1620 "R_PPC64_GOT_TLSGD16_LO", /* name */ 1621 FALSE, /* partial_inplace */ 1622 0, /* src_mask */ 1623 0xffff, /* dst_mask */ 1624 FALSE), /* pcrel_offset */ 1625 1626 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */ 1627 HOWTO (R_PPC64_GOT_TLSGD16_HI, 1628 16, /* rightshift */ 1629 1, /* size (0 = byte, 1 = short, 2 = long) */ 1630 16, /* bitsize */ 1631 FALSE, /* pc_relative */ 1632 0, /* bitpos */ 1633 complain_overflow_dont, /* complain_on_overflow */ 1634 ppc64_elf_unhandled_reloc, /* special_function */ 1635 "R_PPC64_GOT_TLSGD16_HI", /* name */ 1636 FALSE, /* partial_inplace */ 1637 0, /* src_mask */ 1638 0xffff, /* dst_mask */ 1639 FALSE), /* pcrel_offset */ 1640 1641 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */ 1642 HOWTO (R_PPC64_GOT_TLSGD16_HA, 1643 16, /* rightshift */ 1644 1, /* size (0 = byte, 1 = short, 2 = long) */ 1645 16, /* bitsize */ 1646 FALSE, /* pc_relative */ 1647 0, /* bitpos */ 1648 complain_overflow_dont, /* complain_on_overflow */ 1649 ppc64_elf_unhandled_reloc, /* special_function */ 1650 "R_PPC64_GOT_TLSGD16_HA", /* name */ 1651 FALSE, /* partial_inplace */ 1652 0, /* src_mask */ 1653 0xffff, /* dst_mask */ 1654 FALSE), /* pcrel_offset */ 1655 1656 /* Allocates two contiguous entries in the GOT to hold a tls_index structure, 1657 with values (sym+add)@dtpmod and zero, and computes the offset to the 1658 first entry relative to the TOC base (r2). */ 1659 HOWTO (R_PPC64_GOT_TLSLD16, 1660 0, /* rightshift */ 1661 1, /* size (0 = byte, 1 = short, 2 = long) */ 1662 16, /* bitsize */ 1663 FALSE, /* pc_relative */ 1664 0, /* bitpos */ 1665 complain_overflow_signed, /* complain_on_overflow */ 1666 ppc64_elf_unhandled_reloc, /* special_function */ 1667 "R_PPC64_GOT_TLSLD16", /* name */ 1668 FALSE, /* partial_inplace */ 1669 0, /* src_mask */ 1670 0xffff, /* dst_mask */ 1671 FALSE), /* pcrel_offset */ 1672 1673 /* Like GOT_TLSLD16, but no overflow. */ 1674 HOWTO (R_PPC64_GOT_TLSLD16_LO, 1675 0, /* rightshift */ 1676 1, /* size (0 = byte, 1 = short, 2 = long) */ 1677 16, /* bitsize */ 1678 FALSE, /* pc_relative */ 1679 0, /* bitpos */ 1680 complain_overflow_dont, /* complain_on_overflow */ 1681 ppc64_elf_unhandled_reloc, /* special_function */ 1682 "R_PPC64_GOT_TLSLD16_LO", /* name */ 1683 FALSE, /* partial_inplace */ 1684 0, /* src_mask */ 1685 0xffff, /* dst_mask */ 1686 FALSE), /* pcrel_offset */ 1687 1688 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */ 1689 HOWTO (R_PPC64_GOT_TLSLD16_HI, 1690 16, /* rightshift */ 1691 1, /* size (0 = byte, 1 = short, 2 = long) */ 1692 16, /* bitsize */ 1693 FALSE, /* pc_relative */ 1694 0, /* bitpos */ 1695 complain_overflow_dont, /* complain_on_overflow */ 1696 ppc64_elf_unhandled_reloc, /* special_function */ 1697 "R_PPC64_GOT_TLSLD16_HI", /* name */ 1698 FALSE, /* partial_inplace */ 1699 0, /* src_mask */ 1700 0xffff, /* dst_mask */ 1701 FALSE), /* pcrel_offset */ 1702 1703 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */ 1704 HOWTO (R_PPC64_GOT_TLSLD16_HA, 1705 16, /* rightshift */ 1706 1, /* size (0 = byte, 1 = short, 2 = long) */ 1707 16, /* bitsize */ 1708 FALSE, /* pc_relative */ 1709 0, /* bitpos */ 1710 complain_overflow_dont, /* complain_on_overflow */ 1711 ppc64_elf_unhandled_reloc, /* special_function */ 1712 "R_PPC64_GOT_TLSLD16_HA", /* name */ 1713 FALSE, /* partial_inplace */ 1714 0, /* src_mask */ 1715 0xffff, /* dst_mask */ 1716 FALSE), /* pcrel_offset */ 1717 1718 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes 1719 the offset to the entry relative to the TOC base (r2). */ 1720 HOWTO (R_PPC64_GOT_DTPREL16_DS, 1721 0, /* rightshift */ 1722 1, /* size (0 = byte, 1 = short, 2 = long) */ 1723 16, /* bitsize */ 1724 FALSE, /* pc_relative */ 1725 0, /* bitpos */ 1726 complain_overflow_signed, /* complain_on_overflow */ 1727 ppc64_elf_unhandled_reloc, /* special_function */ 1728 "R_PPC64_GOT_DTPREL16_DS", /* name */ 1729 FALSE, /* partial_inplace */ 1730 0, /* src_mask */ 1731 0xfffc, /* dst_mask */ 1732 FALSE), /* pcrel_offset */ 1733 1734 /* Like GOT_DTPREL16_DS, but no overflow. */ 1735 HOWTO (R_PPC64_GOT_DTPREL16_LO_DS, 1736 0, /* rightshift */ 1737 1, /* size (0 = byte, 1 = short, 2 = long) */ 1738 16, /* bitsize */ 1739 FALSE, /* pc_relative */ 1740 0, /* bitpos */ 1741 complain_overflow_dont, /* complain_on_overflow */ 1742 ppc64_elf_unhandled_reloc, /* special_function */ 1743 "R_PPC64_GOT_DTPREL16_LO_DS", /* name */ 1744 FALSE, /* partial_inplace */ 1745 0, /* src_mask */ 1746 0xfffc, /* dst_mask */ 1747 FALSE), /* pcrel_offset */ 1748 1749 /* Like GOT_DTPREL16_LO_DS, but next higher group of 16 bits. */ 1750 HOWTO (R_PPC64_GOT_DTPREL16_HI, 1751 16, /* rightshift */ 1752 1, /* size (0 = byte, 1 = short, 2 = long) */ 1753 16, /* bitsize */ 1754 FALSE, /* pc_relative */ 1755 0, /* bitpos */ 1756 complain_overflow_dont, /* complain_on_overflow */ 1757 ppc64_elf_unhandled_reloc, /* special_function */ 1758 "R_PPC64_GOT_DTPREL16_HI", /* name */ 1759 FALSE, /* partial_inplace */ 1760 0, /* src_mask */ 1761 0xffff, /* dst_mask */ 1762 FALSE), /* pcrel_offset */ 1763 1764 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */ 1765 HOWTO (R_PPC64_GOT_DTPREL16_HA, 1766 16, /* rightshift */ 1767 1, /* size (0 = byte, 1 = short, 2 = long) */ 1768 16, /* bitsize */ 1769 FALSE, /* pc_relative */ 1770 0, /* bitpos */ 1771 complain_overflow_dont, /* complain_on_overflow */ 1772 ppc64_elf_unhandled_reloc, /* special_function */ 1773 "R_PPC64_GOT_DTPREL16_HA", /* name */ 1774 FALSE, /* partial_inplace */ 1775 0, /* src_mask */ 1776 0xffff, /* dst_mask */ 1777 FALSE), /* pcrel_offset */ 1778 1779 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the 1780 offset to the entry relative to the TOC base (r2). */ 1781 HOWTO (R_PPC64_GOT_TPREL16_DS, 1782 0, /* rightshift */ 1783 1, /* size (0 = byte, 1 = short, 2 = long) */ 1784 16, /* bitsize */ 1785 FALSE, /* pc_relative */ 1786 0, /* bitpos */ 1787 complain_overflow_signed, /* complain_on_overflow */ 1788 ppc64_elf_unhandled_reloc, /* special_function */ 1789 "R_PPC64_GOT_TPREL16_DS", /* name */ 1790 FALSE, /* partial_inplace */ 1791 0, /* src_mask */ 1792 0xfffc, /* dst_mask */ 1793 FALSE), /* pcrel_offset */ 1794 1795 /* Like GOT_TPREL16_DS, but no overflow. */ 1796 HOWTO (R_PPC64_GOT_TPREL16_LO_DS, 1797 0, /* rightshift */ 1798 1, /* size (0 = byte, 1 = short, 2 = long) */ 1799 16, /* bitsize */ 1800 FALSE, /* pc_relative */ 1801 0, /* bitpos */ 1802 complain_overflow_dont, /* complain_on_overflow */ 1803 ppc64_elf_unhandled_reloc, /* special_function */ 1804 "R_PPC64_GOT_TPREL16_LO_DS", /* name */ 1805 FALSE, /* partial_inplace */ 1806 0, /* src_mask */ 1807 0xfffc, /* dst_mask */ 1808 FALSE), /* pcrel_offset */ 1809 1810 /* Like GOT_TPREL16_LO_DS, but next higher group of 16 bits. */ 1811 HOWTO (R_PPC64_GOT_TPREL16_HI, 1812 16, /* rightshift */ 1813 1, /* size (0 = byte, 1 = short, 2 = long) */ 1814 16, /* bitsize */ 1815 FALSE, /* pc_relative */ 1816 0, /* bitpos */ 1817 complain_overflow_dont, /* complain_on_overflow */ 1818 ppc64_elf_unhandled_reloc, /* special_function */ 1819 "R_PPC64_GOT_TPREL16_HI", /* name */ 1820 FALSE, /* partial_inplace */ 1821 0, /* src_mask */ 1822 0xffff, /* dst_mask */ 1823 FALSE), /* pcrel_offset */ 1824 1825 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */ 1826 HOWTO (R_PPC64_GOT_TPREL16_HA, 1827 16, /* rightshift */ 1828 1, /* size (0 = byte, 1 = short, 2 = long) */ 1829 16, /* bitsize */ 1830 FALSE, /* pc_relative */ 1831 0, /* bitpos */ 1832 complain_overflow_dont, /* complain_on_overflow */ 1833 ppc64_elf_unhandled_reloc, /* special_function */ 1834 "R_PPC64_GOT_TPREL16_HA", /* name */ 1835 FALSE, /* partial_inplace */ 1836 0, /* src_mask */ 1837 0xffff, /* dst_mask */ 1838 FALSE), /* pcrel_offset */ 1839 1840 /* GNU extension to record C++ vtable hierarchy. */ 1841 HOWTO (R_PPC64_GNU_VTINHERIT, /* type */ 1842 0, /* rightshift */ 1843 0, /* size (0 = byte, 1 = short, 2 = long) */ 1844 0, /* bitsize */ 1845 FALSE, /* pc_relative */ 1846 0, /* bitpos */ 1847 complain_overflow_dont, /* complain_on_overflow */ 1848 NULL, /* special_function */ 1849 "R_PPC64_GNU_VTINHERIT", /* name */ 1850 FALSE, /* partial_inplace */ 1851 0, /* src_mask */ 1852 0, /* dst_mask */ 1853 FALSE), /* pcrel_offset */ 1854 1855 /* GNU extension to record C++ vtable member usage. */ 1856 HOWTO (R_PPC64_GNU_VTENTRY, /* type */ 1857 0, /* rightshift */ 1858 0, /* size (0 = byte, 1 = short, 2 = long) */ 1859 0, /* bitsize */ 1860 FALSE, /* pc_relative */ 1861 0, /* bitpos */ 1862 complain_overflow_dont, /* complain_on_overflow */ 1863 NULL, /* special_function */ 1864 "R_PPC64_GNU_VTENTRY", /* name */ 1865 FALSE, /* partial_inplace */ 1866 0, /* src_mask */ 1867 0, /* dst_mask */ 1868 FALSE), /* pcrel_offset */ 1869}; 1870 1871 1872/* Initialize the ppc64_elf_howto_table, so that linear accesses can 1873 be done. */ 1874 1875static void 1876ppc_howto_init (void) 1877{ 1878 unsigned int i, type; 1879 1880 for (i = 0; 1881 i < sizeof (ppc64_elf_howto_raw) / sizeof (ppc64_elf_howto_raw[0]); 1882 i++) 1883 { 1884 type = ppc64_elf_howto_raw[i].type; 1885 BFD_ASSERT (type < (sizeof (ppc64_elf_howto_table) 1886 / sizeof (ppc64_elf_howto_table[0]))); 1887 ppc64_elf_howto_table[type] = &ppc64_elf_howto_raw[i]; 1888 } 1889} 1890 1891static reloc_howto_type * 1892ppc64_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 1893 bfd_reloc_code_real_type code) 1894{ 1895 enum elf_ppc64_reloc_type r = R_PPC64_NONE; 1896 1897 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 1898 /* Initialize howto table if needed. */ 1899 ppc_howto_init (); 1900 1901 switch (code) 1902 { 1903 default: 1904 return NULL; 1905 1906 case BFD_RELOC_NONE: r = R_PPC64_NONE; 1907 break; 1908 case BFD_RELOC_32: r = R_PPC64_ADDR32; 1909 break; 1910 case BFD_RELOC_PPC_BA26: r = R_PPC64_ADDR24; 1911 break; 1912 case BFD_RELOC_16: r = R_PPC64_ADDR16; 1913 break; 1914 case BFD_RELOC_LO16: r = R_PPC64_ADDR16_LO; 1915 break; 1916 case BFD_RELOC_HI16: r = R_PPC64_ADDR16_HI; 1917 break; 1918 case BFD_RELOC_HI16_S: r = R_PPC64_ADDR16_HA; 1919 break; 1920 case BFD_RELOC_PPC_BA16: r = R_PPC64_ADDR14; 1921 break; 1922 case BFD_RELOC_PPC_BA16_BRTAKEN: r = R_PPC64_ADDR14_BRTAKEN; 1923 break; 1924 case BFD_RELOC_PPC_BA16_BRNTAKEN: r = R_PPC64_ADDR14_BRNTAKEN; 1925 break; 1926 case BFD_RELOC_PPC_B26: r = R_PPC64_REL24; 1927 break; 1928 case BFD_RELOC_PPC_B16: r = R_PPC64_REL14; 1929 break; 1930 case BFD_RELOC_PPC_B16_BRTAKEN: r = R_PPC64_REL14_BRTAKEN; 1931 break; 1932 case BFD_RELOC_PPC_B16_BRNTAKEN: r = R_PPC64_REL14_BRNTAKEN; 1933 break; 1934 case BFD_RELOC_16_GOTOFF: r = R_PPC64_GOT16; 1935 break; 1936 case BFD_RELOC_LO16_GOTOFF: r = R_PPC64_GOT16_LO; 1937 break; 1938 case BFD_RELOC_HI16_GOTOFF: r = R_PPC64_GOT16_HI; 1939 break; 1940 case BFD_RELOC_HI16_S_GOTOFF: r = R_PPC64_GOT16_HA; 1941 break; 1942 case BFD_RELOC_PPC_COPY: r = R_PPC64_COPY; 1943 break; 1944 case BFD_RELOC_PPC_GLOB_DAT: r = R_PPC64_GLOB_DAT; 1945 break; 1946 case BFD_RELOC_32_PCREL: r = R_PPC64_REL32; 1947 break; 1948 case BFD_RELOC_32_PLTOFF: r = R_PPC64_PLT32; 1949 break; 1950 case BFD_RELOC_32_PLT_PCREL: r = R_PPC64_PLTREL32; 1951 break; 1952 case BFD_RELOC_LO16_PLTOFF: r = R_PPC64_PLT16_LO; 1953 break; 1954 case BFD_RELOC_HI16_PLTOFF: r = R_PPC64_PLT16_HI; 1955 break; 1956 case BFD_RELOC_HI16_S_PLTOFF: r = R_PPC64_PLT16_HA; 1957 break; 1958 case BFD_RELOC_16_BASEREL: r = R_PPC64_SECTOFF; 1959 break; 1960 case BFD_RELOC_LO16_BASEREL: r = R_PPC64_SECTOFF_LO; 1961 break; 1962 case BFD_RELOC_HI16_BASEREL: r = R_PPC64_SECTOFF_HI; 1963 break; 1964 case BFD_RELOC_HI16_S_BASEREL: r = R_PPC64_SECTOFF_HA; 1965 break; 1966 case BFD_RELOC_CTOR: r = R_PPC64_ADDR64; 1967 break; 1968 case BFD_RELOC_64: r = R_PPC64_ADDR64; 1969 break; 1970 case BFD_RELOC_PPC64_HIGHER: r = R_PPC64_ADDR16_HIGHER; 1971 break; 1972 case BFD_RELOC_PPC64_HIGHER_S: r = R_PPC64_ADDR16_HIGHERA; 1973 break; 1974 case BFD_RELOC_PPC64_HIGHEST: r = R_PPC64_ADDR16_HIGHEST; 1975 break; 1976 case BFD_RELOC_PPC64_HIGHEST_S: r = R_PPC64_ADDR16_HIGHESTA; 1977 break; 1978 case BFD_RELOC_64_PCREL: r = R_PPC64_REL64; 1979 break; 1980 case BFD_RELOC_64_PLTOFF: r = R_PPC64_PLT64; 1981 break; 1982 case BFD_RELOC_64_PLT_PCREL: r = R_PPC64_PLTREL64; 1983 break; 1984 case BFD_RELOC_PPC_TOC16: r = R_PPC64_TOC16; 1985 break; 1986 case BFD_RELOC_PPC64_TOC16_LO: r = R_PPC64_TOC16_LO; 1987 break; 1988 case BFD_RELOC_PPC64_TOC16_HI: r = R_PPC64_TOC16_HI; 1989 break; 1990 case BFD_RELOC_PPC64_TOC16_HA: r = R_PPC64_TOC16_HA; 1991 break; 1992 case BFD_RELOC_PPC64_TOC: r = R_PPC64_TOC; 1993 break; 1994 case BFD_RELOC_PPC64_PLTGOT16: r = R_PPC64_PLTGOT16; 1995 break; 1996 case BFD_RELOC_PPC64_PLTGOT16_LO: r = R_PPC64_PLTGOT16_LO; 1997 break; 1998 case BFD_RELOC_PPC64_PLTGOT16_HI: r = R_PPC64_PLTGOT16_HI; 1999 break; 2000 case BFD_RELOC_PPC64_PLTGOT16_HA: r = R_PPC64_PLTGOT16_HA; 2001 break; 2002 case BFD_RELOC_PPC64_ADDR16_DS: r = R_PPC64_ADDR16_DS; 2003 break; 2004 case BFD_RELOC_PPC64_ADDR16_LO_DS: r = R_PPC64_ADDR16_LO_DS; 2005 break; 2006 case BFD_RELOC_PPC64_GOT16_DS: r = R_PPC64_GOT16_DS; 2007 break; 2008 case BFD_RELOC_PPC64_GOT16_LO_DS: r = R_PPC64_GOT16_LO_DS; 2009 break; 2010 case BFD_RELOC_PPC64_PLT16_LO_DS: r = R_PPC64_PLT16_LO_DS; 2011 break; 2012 case BFD_RELOC_PPC64_SECTOFF_DS: r = R_PPC64_SECTOFF_DS; 2013 break; 2014 case BFD_RELOC_PPC64_SECTOFF_LO_DS: r = R_PPC64_SECTOFF_LO_DS; 2015 break; 2016 case BFD_RELOC_PPC64_TOC16_DS: r = R_PPC64_TOC16_DS; 2017 break; 2018 case BFD_RELOC_PPC64_TOC16_LO_DS: r = R_PPC64_TOC16_LO_DS; 2019 break; 2020 case BFD_RELOC_PPC64_PLTGOT16_DS: r = R_PPC64_PLTGOT16_DS; 2021 break; 2022 case BFD_RELOC_PPC64_PLTGOT16_LO_DS: r = R_PPC64_PLTGOT16_LO_DS; 2023 break; 2024 case BFD_RELOC_PPC_TLS: r = R_PPC64_TLS; 2025 break; 2026 case BFD_RELOC_PPC_DTPMOD: r = R_PPC64_DTPMOD64; 2027 break; 2028 case BFD_RELOC_PPC_TPREL16: r = R_PPC64_TPREL16; 2029 break; 2030 case BFD_RELOC_PPC_TPREL16_LO: r = R_PPC64_TPREL16_LO; 2031 break; 2032 case BFD_RELOC_PPC_TPREL16_HI: r = R_PPC64_TPREL16_HI; 2033 break; 2034 case BFD_RELOC_PPC_TPREL16_HA: r = R_PPC64_TPREL16_HA; 2035 break; 2036 case BFD_RELOC_PPC_TPREL: r = R_PPC64_TPREL64; 2037 break; 2038 case BFD_RELOC_PPC_DTPREL16: r = R_PPC64_DTPREL16; 2039 break; 2040 case BFD_RELOC_PPC_DTPREL16_LO: r = R_PPC64_DTPREL16_LO; 2041 break; 2042 case BFD_RELOC_PPC_DTPREL16_HI: r = R_PPC64_DTPREL16_HI; 2043 break; 2044 case BFD_RELOC_PPC_DTPREL16_HA: r = R_PPC64_DTPREL16_HA; 2045 break; 2046 case BFD_RELOC_PPC_DTPREL: r = R_PPC64_DTPREL64; 2047 break; 2048 case BFD_RELOC_PPC_GOT_TLSGD16: r = R_PPC64_GOT_TLSGD16; 2049 break; 2050 case BFD_RELOC_PPC_GOT_TLSGD16_LO: r = R_PPC64_GOT_TLSGD16_LO; 2051 break; 2052 case BFD_RELOC_PPC_GOT_TLSGD16_HI: r = R_PPC64_GOT_TLSGD16_HI; 2053 break; 2054 case BFD_RELOC_PPC_GOT_TLSGD16_HA: r = R_PPC64_GOT_TLSGD16_HA; 2055 break; 2056 case BFD_RELOC_PPC_GOT_TLSLD16: r = R_PPC64_GOT_TLSLD16; 2057 break; 2058 case BFD_RELOC_PPC_GOT_TLSLD16_LO: r = R_PPC64_GOT_TLSLD16_LO; 2059 break; 2060 case BFD_RELOC_PPC_GOT_TLSLD16_HI: r = R_PPC64_GOT_TLSLD16_HI; 2061 break; 2062 case BFD_RELOC_PPC_GOT_TLSLD16_HA: r = R_PPC64_GOT_TLSLD16_HA; 2063 break; 2064 case BFD_RELOC_PPC_GOT_TPREL16: r = R_PPC64_GOT_TPREL16_DS; 2065 break; 2066 case BFD_RELOC_PPC_GOT_TPREL16_LO: r = R_PPC64_GOT_TPREL16_LO_DS; 2067 break; 2068 case BFD_RELOC_PPC_GOT_TPREL16_HI: r = R_PPC64_GOT_TPREL16_HI; 2069 break; 2070 case BFD_RELOC_PPC_GOT_TPREL16_HA: r = R_PPC64_GOT_TPREL16_HA; 2071 break; 2072 case BFD_RELOC_PPC_GOT_DTPREL16: r = R_PPC64_GOT_DTPREL16_DS; 2073 break; 2074 case BFD_RELOC_PPC_GOT_DTPREL16_LO: r = R_PPC64_GOT_DTPREL16_LO_DS; 2075 break; 2076 case BFD_RELOC_PPC_GOT_DTPREL16_HI: r = R_PPC64_GOT_DTPREL16_HI; 2077 break; 2078 case BFD_RELOC_PPC_GOT_DTPREL16_HA: r = R_PPC64_GOT_DTPREL16_HA; 2079 break; 2080 case BFD_RELOC_PPC64_TPREL16_DS: r = R_PPC64_TPREL16_DS; 2081 break; 2082 case BFD_RELOC_PPC64_TPREL16_LO_DS: r = R_PPC64_TPREL16_LO_DS; 2083 break; 2084 case BFD_RELOC_PPC64_TPREL16_HIGHER: r = R_PPC64_TPREL16_HIGHER; 2085 break; 2086 case BFD_RELOC_PPC64_TPREL16_HIGHERA: r = R_PPC64_TPREL16_HIGHERA; 2087 break; 2088 case BFD_RELOC_PPC64_TPREL16_HIGHEST: r = R_PPC64_TPREL16_HIGHEST; 2089 break; 2090 case BFD_RELOC_PPC64_TPREL16_HIGHESTA: r = R_PPC64_TPREL16_HIGHESTA; 2091 break; 2092 case BFD_RELOC_PPC64_DTPREL16_DS: r = R_PPC64_DTPREL16_DS; 2093 break; 2094 case BFD_RELOC_PPC64_DTPREL16_LO_DS: r = R_PPC64_DTPREL16_LO_DS; 2095 break; 2096 case BFD_RELOC_PPC64_DTPREL16_HIGHER: r = R_PPC64_DTPREL16_HIGHER; 2097 break; 2098 case BFD_RELOC_PPC64_DTPREL16_HIGHERA: r = R_PPC64_DTPREL16_HIGHERA; 2099 break; 2100 case BFD_RELOC_PPC64_DTPREL16_HIGHEST: r = R_PPC64_DTPREL16_HIGHEST; 2101 break; 2102 case BFD_RELOC_PPC64_DTPREL16_HIGHESTA: r = R_PPC64_DTPREL16_HIGHESTA; 2103 break; 2104 case BFD_RELOC_VTABLE_INHERIT: r = R_PPC64_GNU_VTINHERIT; 2105 break; 2106 case BFD_RELOC_VTABLE_ENTRY: r = R_PPC64_GNU_VTENTRY; 2107 break; 2108 } 2109 2110 return ppc64_elf_howto_table[r]; 2111}; 2112 2113/* Set the howto pointer for a PowerPC ELF reloc. */ 2114 2115static void 2116ppc64_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, 2117 Elf_Internal_Rela *dst) 2118{ 2119 unsigned int type; 2120 2121 /* Initialize howto table if needed. */ 2122 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 2123 ppc_howto_init (); 2124 2125 type = ELF64_R_TYPE (dst->r_info); 2126 if (type >= (sizeof (ppc64_elf_howto_table) 2127 / sizeof (ppc64_elf_howto_table[0]))) 2128 { 2129 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 2130 abfd, (int) type); 2131 type = R_PPC64_NONE; 2132 } 2133 cache_ptr->howto = ppc64_elf_howto_table[type]; 2134} 2135 2136/* Handle the R_PPC64_ADDR16_HA and similar relocs. */ 2137 2138static bfd_reloc_status_type 2139ppc64_elf_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2140 void *data, asection *input_section, 2141 bfd *output_bfd, char **error_message) 2142{ 2143 /* If this is a relocatable link (output_bfd test tells us), just 2144 call the generic function. Any adjustment will be done at final 2145 link time. */ 2146 if (output_bfd != NULL) 2147 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2148 input_section, output_bfd, error_message); 2149 2150 /* Adjust the addend for sign extension of the low 16 bits. 2151 We won't actually be using the low 16 bits, so trashing them 2152 doesn't matter. */ 2153 reloc_entry->addend += 0x8000; 2154 return bfd_reloc_continue; 2155} 2156 2157static bfd_reloc_status_type 2158ppc64_elf_branch_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2159 void *data, asection *input_section, 2160 bfd *output_bfd, char **error_message) 2161{ 2162 if (output_bfd != NULL) 2163 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2164 input_section, output_bfd, error_message); 2165 2166 if (strcmp (symbol->section->name, ".opd") == 0 2167 && (symbol->section->owner->flags & DYNAMIC) == 0) 2168 { 2169 bfd_vma dest = opd_entry_value (symbol->section, 2170 symbol->value + reloc_entry->addend, 2171 NULL, NULL); 2172 if (dest != (bfd_vma) -1) 2173 reloc_entry->addend = dest - (symbol->value 2174 + symbol->section->output_section->vma 2175 + symbol->section->output_offset); 2176 } 2177 return bfd_reloc_continue; 2178} 2179 2180static bfd_reloc_status_type 2181ppc64_elf_brtaken_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2182 void *data, asection *input_section, 2183 bfd *output_bfd, char **error_message) 2184{ 2185 long insn; 2186 enum elf_ppc64_reloc_type r_type; 2187 bfd_size_type octets; 2188 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */ 2189 bfd_boolean is_power4 = FALSE; 2190 2191 /* If this is a relocatable link (output_bfd test tells us), just 2192 call the generic function. Any adjustment will be done at final 2193 link time. */ 2194 if (output_bfd != NULL) 2195 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2196 input_section, output_bfd, error_message); 2197 2198 octets = reloc_entry->address * bfd_octets_per_byte (abfd); 2199 insn = bfd_get_32 (abfd, (bfd_byte *) data + octets); 2200 insn &= ~(0x01 << 21); 2201 r_type = reloc_entry->howto->type; 2202 if (r_type == R_PPC64_ADDR14_BRTAKEN 2203 || r_type == R_PPC64_REL14_BRTAKEN) 2204 insn |= 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */ 2205 2206 if (is_power4) 2207 { 2208 /* Set 'a' bit. This is 0b00010 in BO field for branch 2209 on CR(BI) insns (BO == 001at or 011at), and 0b01000 2210 for branch on CTR insns (BO == 1a00t or 1a01t). */ 2211 if ((insn & (0x14 << 21)) == (0x04 << 21)) 2212 insn |= 0x02 << 21; 2213 else if ((insn & (0x14 << 21)) == (0x10 << 21)) 2214 insn |= 0x08 << 21; 2215 else 2216 goto out; 2217 } 2218 else 2219 { 2220 bfd_vma target = 0; 2221 bfd_vma from; 2222 2223 if (!bfd_is_com_section (symbol->section)) 2224 target = symbol->value; 2225 target += symbol->section->output_section->vma; 2226 target += symbol->section->output_offset; 2227 target += reloc_entry->addend; 2228 2229 from = (reloc_entry->address 2230 + input_section->output_offset 2231 + input_section->output_section->vma); 2232 2233 /* Invert 'y' bit if not the default. */ 2234 if ((bfd_signed_vma) (target - from) < 0) 2235 insn ^= 0x01 << 21; 2236 } 2237 bfd_put_32 (abfd, insn, (bfd_byte *) data + octets); 2238 out: 2239 return ppc64_elf_branch_reloc (abfd, reloc_entry, symbol, data, 2240 input_section, output_bfd, error_message); 2241} 2242 2243static bfd_reloc_status_type 2244ppc64_elf_sectoff_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2245 void *data, asection *input_section, 2246 bfd *output_bfd, char **error_message) 2247{ 2248 /* If this is a relocatable link (output_bfd test tells us), just 2249 call the generic function. Any adjustment will be done at final 2250 link time. */ 2251 if (output_bfd != NULL) 2252 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2253 input_section, output_bfd, error_message); 2254 2255 /* Subtract the symbol section base address. */ 2256 reloc_entry->addend -= symbol->section->output_section->vma; 2257 return bfd_reloc_continue; 2258} 2259 2260static bfd_reloc_status_type 2261ppc64_elf_sectoff_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2262 void *data, asection *input_section, 2263 bfd *output_bfd, char **error_message) 2264{ 2265 /* If this is a relocatable link (output_bfd test tells us), just 2266 call the generic function. Any adjustment will be done at final 2267 link time. */ 2268 if (output_bfd != NULL) 2269 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2270 input_section, output_bfd, error_message); 2271 2272 /* Subtract the symbol section base address. */ 2273 reloc_entry->addend -= symbol->section->output_section->vma; 2274 2275 /* Adjust the addend for sign extension of the low 16 bits. */ 2276 reloc_entry->addend += 0x8000; 2277 return bfd_reloc_continue; 2278} 2279 2280static bfd_reloc_status_type 2281ppc64_elf_toc_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2282 void *data, asection *input_section, 2283 bfd *output_bfd, char **error_message) 2284{ 2285 bfd_vma TOCstart; 2286 2287 /* If this is a relocatable link (output_bfd test tells us), just 2288 call the generic function. Any adjustment will be done at final 2289 link time. */ 2290 if (output_bfd != NULL) 2291 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2292 input_section, output_bfd, error_message); 2293 2294 TOCstart = _bfd_get_gp_value (input_section->output_section->owner); 2295 if (TOCstart == 0) 2296 TOCstart = ppc64_elf_toc (input_section->output_section->owner); 2297 2298 /* Subtract the TOC base address. */ 2299 reloc_entry->addend -= TOCstart + TOC_BASE_OFF; 2300 return bfd_reloc_continue; 2301} 2302 2303static bfd_reloc_status_type 2304ppc64_elf_toc_ha_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 2324 /* Adjust the addend for sign extension of the low 16 bits. */ 2325 reloc_entry->addend += 0x8000; 2326 return bfd_reloc_continue; 2327} 2328 2329static bfd_reloc_status_type 2330ppc64_elf_toc64_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2331 void *data, asection *input_section, 2332 bfd *output_bfd, char **error_message) 2333{ 2334 bfd_vma TOCstart; 2335 bfd_size_type octets; 2336 2337 /* If this is a relocatable link (output_bfd test tells us), just 2338 call the generic function. Any adjustment will be done at final 2339 link time. */ 2340 if (output_bfd != NULL) 2341 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2342 input_section, output_bfd, error_message); 2343 2344 TOCstart = _bfd_get_gp_value (input_section->output_section->owner); 2345 if (TOCstart == 0) 2346 TOCstart = ppc64_elf_toc (input_section->output_section->owner); 2347 2348 octets = reloc_entry->address * bfd_octets_per_byte (abfd); 2349 bfd_put_64 (abfd, TOCstart + TOC_BASE_OFF, (bfd_byte *) data + octets); 2350 return bfd_reloc_ok; 2351} 2352 2353static bfd_reloc_status_type 2354ppc64_elf_unhandled_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2355 void *data, asection *input_section, 2356 bfd *output_bfd, char **error_message) 2357{ 2358 /* If this is a relocatable link (output_bfd test tells us), just 2359 call the generic function. Any adjustment will be done at final 2360 link time. */ 2361 if (output_bfd != NULL) 2362 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2363 input_section, output_bfd, error_message); 2364 2365 if (error_message != NULL) 2366 { 2367 static char buf[60]; 2368 sprintf (buf, "generic linker can't handle %s", 2369 reloc_entry->howto->name); 2370 *error_message = buf; 2371 } 2372 return bfd_reloc_dangerous; 2373} 2374 2375struct ppc64_elf_obj_tdata 2376{ 2377 struct elf_obj_tdata elf; 2378 2379 /* Shortcuts to dynamic linker sections. */ 2380 asection *got; 2381 asection *relgot; 2382 2383 /* Used during garbage collection. We attach global symbols defined 2384 on removed .opd entries to this section so that the sym is removed. */ 2385 asection *deleted_section; 2386 2387 /* TLS local dynamic got entry handling. Suppose for multiple GOT 2388 sections means we potentially need one of these for each input bfd. */ 2389 union { 2390 bfd_signed_vma refcount; 2391 bfd_vma offset; 2392 } tlsld_got; 2393 2394 /* A copy of relocs before they are modified for --emit-relocs. */ 2395 Elf_Internal_Rela *opd_relocs; 2396}; 2397 2398#define ppc64_elf_tdata(bfd) \ 2399 ((struct ppc64_elf_obj_tdata *) (bfd)->tdata.any) 2400 2401#define ppc64_tlsld_got(bfd) \ 2402 (&ppc64_elf_tdata (bfd)->tlsld_got) 2403 2404/* Override the generic function because we store some extras. */ 2405 2406static bfd_boolean 2407ppc64_elf_mkobject (bfd *abfd) 2408{ 2409 if (abfd->tdata.any == NULL) 2410 { 2411 bfd_size_type amt = sizeof (struct ppc64_elf_obj_tdata); 2412 abfd->tdata.any = bfd_zalloc (abfd, amt); 2413 if (abfd->tdata.any == NULL) 2414 return FALSE; 2415 } 2416 return bfd_elf_mkobject (abfd); 2417} 2418 2419/* Return 1 if target is one of ours. */ 2420 2421static bfd_boolean 2422is_ppc64_elf_target (const struct bfd_target *targ) 2423{ 2424 extern const bfd_target bfd_elf64_powerpc_vec; 2425 extern const bfd_target bfd_elf64_powerpcle_vec; 2426 2427 return targ == &bfd_elf64_powerpc_vec || targ == &bfd_elf64_powerpcle_vec; 2428} 2429 2430/* Fix bad default arch selected for a 64 bit input bfd when the 2431 default is 32 bit. */ 2432 2433static bfd_boolean 2434ppc64_elf_object_p (bfd *abfd) 2435{ 2436 if (abfd->arch_info->the_default && abfd->arch_info->bits_per_word == 32) 2437 { 2438 Elf_Internal_Ehdr *i_ehdr = elf_elfheader (abfd); 2439 2440 if (i_ehdr->e_ident[EI_CLASS] == ELFCLASS64) 2441 { 2442 /* Relies on arch after 32 bit default being 64 bit default. */ 2443 abfd->arch_info = abfd->arch_info->next; 2444 BFD_ASSERT (abfd->arch_info->bits_per_word == 64); 2445 } 2446 } 2447 return TRUE; 2448} 2449 2450/* Support for core dump NOTE sections. */ 2451 2452static bfd_boolean 2453ppc64_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 2454{ 2455 size_t offset, size; 2456 2457 if (note->descsz != 504) 2458 return FALSE; 2459 2460 /* pr_cursig */ 2461 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 2462 2463 /* pr_pid */ 2464 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 32); 2465 2466 /* pr_reg */ 2467 offset = 112; 2468 size = 384; 2469 2470 /* Make a ".reg/999" section. */ 2471 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 2472 size, note->descpos + offset); 2473} 2474 2475static bfd_boolean 2476ppc64_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 2477{ 2478 if (note->descsz != 136) 2479 return FALSE; 2480 2481 elf_tdata (abfd)->core_program 2482 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); 2483 elf_tdata (abfd)->core_command 2484 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); 2485 2486 return TRUE; 2487} 2488 2489static char * 2490ppc64_elf_write_core_note (bfd *abfd, char *buf, int *bufsiz, int note_type, 2491 ...) 2492{ 2493 switch (note_type) 2494 { 2495 default: 2496 return NULL; 2497 2498 case NT_PRPSINFO: 2499 { 2500 char data[136]; 2501 va_list ap; 2502 2503 va_start (ap, note_type); 2504 memset (data, 0, 40); 2505 strncpy (data + 40, va_arg (ap, const char *), 16); 2506 strncpy (data + 56, va_arg (ap, const char *), 80); 2507 va_end (ap); 2508 return elfcore_write_note (abfd, buf, bufsiz, 2509 "CORE", note_type, data, sizeof (data)); 2510 } 2511 2512 case NT_PRSTATUS: 2513 { 2514 char data[504]; 2515 va_list ap; 2516 long pid; 2517 int cursig; 2518 const void *greg; 2519 2520 va_start (ap, note_type); 2521 memset (data, 0, 112); 2522 pid = va_arg (ap, long); 2523 bfd_put_32 (abfd, pid, data + 32); 2524 cursig = va_arg (ap, int); 2525 bfd_put_16 (abfd, cursig, data + 12); 2526 greg = va_arg (ap, const void *); 2527 memcpy (data + 112, greg, 384); 2528 memset (data + 496, 0, 8); 2529 va_end (ap); 2530 return elfcore_write_note (abfd, buf, bufsiz, 2531 "CORE", note_type, data, sizeof (data)); 2532 } 2533 } 2534} 2535 2536/* Merge backend specific data from an object file to the output 2537 object file when linking. */ 2538 2539static bfd_boolean 2540ppc64_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 2541{ 2542 /* Check if we have the same endianess. */ 2543 if (ibfd->xvec->byteorder != obfd->xvec->byteorder 2544 && ibfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN 2545 && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN) 2546 { 2547 const char *msg; 2548 2549 if (bfd_big_endian (ibfd)) 2550 msg = _("%B: compiled for a big endian system " 2551 "and target is little endian"); 2552 else 2553 msg = _("%B: compiled for a little endian system " 2554 "and target is big endian"); 2555 2556 (*_bfd_error_handler) (msg, ibfd); 2557 2558 bfd_set_error (bfd_error_wrong_format); 2559 return FALSE; 2560 } 2561 2562 return TRUE; 2563} 2564 2565/* Add extra PPC sections. */ 2566 2567static const struct bfd_elf_special_section ppc64_elf_special_sections[]= 2568{ 2569 { STRING_COMMA_LEN (".plt"), 0, SHT_NOBITS, 0 }, 2570 { STRING_COMMA_LEN (".sbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, 2571 { STRING_COMMA_LEN (".sdata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2572 { STRING_COMMA_LEN (".toc"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2573 { STRING_COMMA_LEN (".toc1"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2574 { STRING_COMMA_LEN (".tocbss"), 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, 2575 { NULL, 0, 0, 0, 0 } 2576}; 2577 2578enum _ppc64_sec_type { 2579 sec_normal = 0, 2580 sec_opd = 1, 2581 sec_toc = 2 2582}; 2583 2584struct _ppc64_elf_section_data 2585{ 2586 struct bfd_elf_section_data elf; 2587 2588 /* An array with one entry for each opd function descriptor. */ 2589 union 2590 { 2591 /* Points to the function code section for local opd entries. */ 2592 asection **opd_func_sec; 2593 /* After editing .opd, adjust references to opd local syms. */ 2594 long *opd_adjust; 2595 2596 /* An array for toc sections, indexed by offset/8. 2597 Specifies the relocation symbol index used at a given toc offset. */ 2598 unsigned *t_symndx; 2599 } u; 2600 2601 enum _ppc64_sec_type sec_type:2; 2602 2603 /* Flag set when small branches are detected. Used to 2604 select suitable defaults for the stub group size. */ 2605 unsigned int has_14bit_branch:1; 2606}; 2607 2608#define ppc64_elf_section_data(sec) \ 2609 ((struct _ppc64_elf_section_data *) elf_section_data (sec)) 2610 2611static bfd_boolean 2612ppc64_elf_new_section_hook (bfd *abfd, asection *sec) 2613{ 2614 if (!sec->used_by_bfd) 2615 { 2616 struct _ppc64_elf_section_data *sdata; 2617 bfd_size_type amt = sizeof (*sdata); 2618 2619 sdata = bfd_zalloc (abfd, amt); 2620 if (sdata == NULL) 2621 return FALSE; 2622 sec->used_by_bfd = sdata; 2623 } 2624 2625 return _bfd_elf_new_section_hook (abfd, sec); 2626} 2627 2628static void * 2629get_opd_info (asection * sec) 2630{ 2631 if (sec != NULL 2632 && ppc64_elf_section_data (sec) != NULL 2633 && ppc64_elf_section_data (sec)->sec_type == sec_opd) 2634 return ppc64_elf_section_data (sec)->u.opd_adjust; 2635 return NULL; 2636} 2637 2638/* Parameters for the qsort hook. */ 2639static asection *synthetic_opd; 2640static bfd_boolean synthetic_relocatable; 2641 2642/* qsort comparison function for ppc64_elf_get_synthetic_symtab. */ 2643 2644static int 2645compare_symbols (const void *ap, const void *bp) 2646{ 2647 const asymbol *a = * (const asymbol **) ap; 2648 const asymbol *b = * (const asymbol **) bp; 2649 2650 /* Section symbols first. */ 2651 if ((a->flags & BSF_SECTION_SYM) && !(b->flags & BSF_SECTION_SYM)) 2652 return -1; 2653 if (!(a->flags & BSF_SECTION_SYM) && (b->flags & BSF_SECTION_SYM)) 2654 return 1; 2655 2656 /* then .opd symbols. */ 2657 if (a->section == synthetic_opd && b->section != synthetic_opd) 2658 return -1; 2659 if (a->section != synthetic_opd && b->section == synthetic_opd) 2660 return 1; 2661 2662 /* then other code symbols. */ 2663 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2664 == (SEC_CODE | SEC_ALLOC) 2665 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2666 != (SEC_CODE | SEC_ALLOC)) 2667 return -1; 2668 2669 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2670 != (SEC_CODE | SEC_ALLOC) 2671 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2672 == (SEC_CODE | SEC_ALLOC)) 2673 return 1; 2674 2675 if (synthetic_relocatable) 2676 { 2677 if (a->section->id < b->section->id) 2678 return -1; 2679 2680 if (a->section->id > b->section->id) 2681 return 1; 2682 } 2683 2684 if (a->value + a->section->vma < b->value + b->section->vma) 2685 return -1; 2686 2687 if (a->value + a->section->vma > b->value + b->section->vma) 2688 return 1; 2689 2690 /* For syms with the same value, prefer strong dynamic global function 2691 syms over other syms. */ 2692 if ((a->flags & BSF_GLOBAL) != 0 && (b->flags & BSF_GLOBAL) == 0) 2693 return -1; 2694 2695 if ((a->flags & BSF_GLOBAL) == 0 && (b->flags & BSF_GLOBAL) != 0) 2696 return 1; 2697 2698 if ((a->flags & BSF_FUNCTION) != 0 && (b->flags & BSF_FUNCTION) == 0) 2699 return -1; 2700 2701 if ((a->flags & BSF_FUNCTION) == 0 && (b->flags & BSF_FUNCTION) != 0) 2702 return 1; 2703 2704 if ((a->flags & BSF_WEAK) == 0 && (b->flags & BSF_WEAK) != 0) 2705 return -1; 2706 2707 if ((a->flags & BSF_WEAK) != 0 && (b->flags & BSF_WEAK) == 0) 2708 return 1; 2709 2710 if ((a->flags & BSF_DYNAMIC) != 0 && (b->flags & BSF_DYNAMIC) == 0) 2711 return -1; 2712 2713 if ((a->flags & BSF_DYNAMIC) == 0 && (b->flags & BSF_DYNAMIC) != 0) 2714 return 1; 2715 2716 return 0; 2717} 2718 2719/* Search SYMS for a symbol of the given VALUE. */ 2720 2721static asymbol * 2722sym_exists_at (asymbol **syms, long lo, long hi, int id, bfd_vma value) 2723{ 2724 long mid; 2725 2726 if (id == -1) 2727 { 2728 while (lo < hi) 2729 { 2730 mid = (lo + hi) >> 1; 2731 if (syms[mid]->value + syms[mid]->section->vma < value) 2732 lo = mid + 1; 2733 else if (syms[mid]->value + syms[mid]->section->vma > value) 2734 hi = mid; 2735 else 2736 return syms[mid]; 2737 } 2738 } 2739 else 2740 { 2741 while (lo < hi) 2742 { 2743 mid = (lo + hi) >> 1; 2744 if (syms[mid]->section->id < id) 2745 lo = mid + 1; 2746 else if (syms[mid]->section->id > id) 2747 hi = mid; 2748 else if (syms[mid]->value < value) 2749 lo = mid + 1; 2750 else if (syms[mid]->value > value) 2751 hi = mid; 2752 else 2753 return syms[mid]; 2754 } 2755 } 2756 return NULL; 2757} 2758 2759/* Create synthetic symbols, effectively restoring "dot-symbol" function 2760 entry syms. */ 2761 2762static long 2763ppc64_elf_get_synthetic_symtab (bfd *abfd, 2764 long static_count, asymbol **static_syms, 2765 long dyn_count, asymbol **dyn_syms, 2766 asymbol **ret) 2767{ 2768 asymbol *s; 2769 long i; 2770 long count; 2771 char *names; 2772 long symcount, codesecsym, codesecsymend, secsymend, opdsymend; 2773 asection *opd; 2774 bfd_boolean relocatable = (abfd->flags & (EXEC_P | DYNAMIC)) == 0; 2775 asymbol **syms; 2776 2777 *ret = NULL; 2778 2779 opd = bfd_get_section_by_name (abfd, ".opd"); 2780 if (opd == NULL) 2781 return 0; 2782 2783 symcount = static_count; 2784 if (!relocatable) 2785 symcount += dyn_count; 2786 if (symcount == 0) 2787 return 0; 2788 2789 syms = bfd_malloc ((symcount + 1) * sizeof (*syms)); 2790 if (syms == NULL) 2791 return -1; 2792 2793 if (!relocatable && static_count != 0 && dyn_count != 0) 2794 { 2795 /* Use both symbol tables. */ 2796 memcpy (syms, static_syms, static_count * sizeof (*syms)); 2797 memcpy (syms + static_count, dyn_syms, (dyn_count + 1) * sizeof (*syms)); 2798 } 2799 else if (!relocatable && static_count == 0) 2800 memcpy (syms, dyn_syms, (symcount + 1) * sizeof (*syms)); 2801 else 2802 memcpy (syms, static_syms, (symcount + 1) * sizeof (*syms)); 2803 2804 synthetic_opd = opd; 2805 synthetic_relocatable = relocatable; 2806 qsort (syms, symcount, sizeof (*syms), compare_symbols); 2807 2808 if (!relocatable && symcount > 1) 2809 { 2810 long j; 2811 /* Trim duplicate syms, since we may have merged the normal and 2812 dynamic symbols. Actually, we only care about syms that have 2813 different values, so trim any with the same value. */ 2814 for (i = 1, j = 1; i < symcount; ++i) 2815 if (syms[i - 1]->value + syms[i - 1]->section->vma 2816 != syms[i]->value + syms[i]->section->vma) 2817 syms[j++] = syms[i]; 2818 symcount = j; 2819 } 2820 2821 i = 0; 2822 if (syms[i]->section == opd) 2823 ++i; 2824 codesecsym = i; 2825 2826 for (; i < symcount; ++i) 2827 if (((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2828 != (SEC_CODE | SEC_ALLOC)) 2829 || (syms[i]->flags & BSF_SECTION_SYM) == 0) 2830 break; 2831 codesecsymend = i; 2832 2833 for (; i < symcount; ++i) 2834 if ((syms[i]->flags & BSF_SECTION_SYM) == 0) 2835 break; 2836 secsymend = i; 2837 2838 for (; i < symcount; ++i) 2839 if (syms[i]->section != opd) 2840 break; 2841 opdsymend = i; 2842 2843 for (; i < symcount; ++i) 2844 if ((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2845 != (SEC_CODE | SEC_ALLOC)) 2846 break; 2847 symcount = i; 2848 2849 count = 0; 2850 if (opdsymend == secsymend) 2851 goto done; 2852 2853 if (relocatable) 2854 { 2855 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean); 2856 arelent *r; 2857 size_t size; 2858 long relcount; 2859 2860 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table; 2861 relcount = (opd->flags & SEC_RELOC) ? opd->reloc_count : 0; 2862 if (relcount == 0) 2863 goto done; 2864 2865 if (!(*slurp_relocs) (abfd, opd, static_syms, FALSE)) 2866 { 2867 count = -1; 2868 goto done; 2869 } 2870 2871 size = 0; 2872 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i) 2873 { 2874 asymbol *sym; 2875 2876 while (r < opd->relocation + relcount 2877 && r->address < syms[i]->value + opd->vma) 2878 ++r; 2879 2880 if (r == opd->relocation + relcount) 2881 break; 2882 2883 if (r->address != syms[i]->value + opd->vma) 2884 continue; 2885 2886 if (r->howto->type != R_PPC64_ADDR64) 2887 continue; 2888 2889 sym = *r->sym_ptr_ptr; 2890 if (!sym_exists_at (syms, opdsymend, symcount, 2891 sym->section->id, sym->value + r->addend)) 2892 { 2893 ++count; 2894 size += sizeof (asymbol); 2895 size += strlen (syms[i]->name) + 2; 2896 } 2897 } 2898 2899 s = *ret = bfd_malloc (size); 2900 if (s == NULL) 2901 { 2902 count = -1; 2903 goto done; 2904 } 2905 2906 names = (char *) (s + count); 2907 2908 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i) 2909 { 2910 asymbol *sym; 2911 2912 while (r < opd->relocation + relcount 2913 && r->address < syms[i]->value + opd->vma) 2914 ++r; 2915 2916 if (r == opd->relocation + relcount) 2917 break; 2918 2919 if (r->address != syms[i]->value + opd->vma) 2920 continue; 2921 2922 if (r->howto->type != R_PPC64_ADDR64) 2923 continue; 2924 2925 sym = *r->sym_ptr_ptr; 2926 if (!sym_exists_at (syms, opdsymend, symcount, 2927 sym->section->id, sym->value + r->addend)) 2928 { 2929 size_t len; 2930 2931 *s = *syms[i]; 2932 s->section = sym->section; 2933 s->value = sym->value + r->addend; 2934 s->name = names; 2935 *names++ = '.'; 2936 len = strlen (syms[i]->name); 2937 memcpy (names, syms[i]->name, len + 1); 2938 names += len + 1; 2939 s++; 2940 } 2941 } 2942 } 2943 else 2944 { 2945 bfd_byte *contents; 2946 size_t size; 2947 2948 if (!bfd_malloc_and_get_section (abfd, opd, &contents)) 2949 { 2950 if (contents) 2951 { 2952 free_contents_and_exit: 2953 free (contents); 2954 } 2955 count = -1; 2956 goto done; 2957 } 2958 2959 size = 0; 2960 for (i = secsymend; i < opdsymend; ++i) 2961 { 2962 bfd_vma ent; 2963 2964 ent = bfd_get_64 (abfd, contents + syms[i]->value); 2965 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent)) 2966 { 2967 ++count; 2968 size += sizeof (asymbol); 2969 size += strlen (syms[i]->name) + 2; 2970 } 2971 } 2972 2973 s = *ret = bfd_malloc (size); 2974 if (s == NULL) 2975 goto free_contents_and_exit; 2976 2977 names = (char *) (s + count); 2978 2979 for (i = secsymend; i < opdsymend; ++i) 2980 { 2981 bfd_vma ent; 2982 2983 ent = bfd_get_64 (abfd, contents + syms[i]->value); 2984 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent)) 2985 { 2986 long lo, hi; 2987 size_t len; 2988 asection *sec = abfd->sections; 2989 2990 *s = *syms[i]; 2991 lo = codesecsym; 2992 hi = codesecsymend; 2993 while (lo < hi) 2994 { 2995 long mid = (lo + hi) >> 1; 2996 if (syms[mid]->section->vma < ent) 2997 lo = mid + 1; 2998 else if (syms[mid]->section->vma > ent) 2999 hi = mid; 3000 else 3001 { 3002 sec = syms[mid]->section; 3003 break; 3004 } 3005 } 3006 3007 if (lo >= hi && lo > codesecsym) 3008 sec = syms[lo - 1]->section; 3009 3010 for (; sec != NULL; sec = sec->next) 3011 { 3012 if (sec->vma > ent) 3013 break; 3014 if ((sec->flags & SEC_ALLOC) == 0 3015 || (sec->flags & SEC_LOAD) == 0) 3016 break; 3017 if ((sec->flags & SEC_CODE) != 0) 3018 s->section = sec; 3019 } 3020 s->value = ent - s->section->vma; 3021 s->name = names; 3022 *names++ = '.'; 3023 len = strlen (syms[i]->name); 3024 memcpy (names, syms[i]->name, len + 1); 3025 names += len + 1; 3026 s++; 3027 } 3028 } 3029 free (contents); 3030 } 3031 3032 done: 3033 free (syms); 3034 return count; 3035} 3036 3037/* The following functions are specific to the ELF linker, while 3038 functions above are used generally. Those named ppc64_elf_* are 3039 called by the main ELF linker code. They appear in this file more 3040 or less in the order in which they are called. eg. 3041 ppc64_elf_check_relocs is called early in the link process, 3042 ppc64_elf_finish_dynamic_sections is one of the last functions 3043 called. 3044 3045 PowerPC64-ELF uses a similar scheme to PowerPC64-XCOFF in that 3046 functions have both a function code symbol and a function descriptor 3047 symbol. A call to foo in a relocatable object file looks like: 3048 3049 . .text 3050 . x: 3051 . bl .foo 3052 . nop 3053 3054 The function definition in another object file might be: 3055 3056 . .section .opd 3057 . foo: .quad .foo 3058 . .quad .TOC.@tocbase 3059 . .quad 0 3060 . 3061 . .text 3062 . .foo: blr 3063 3064 When the linker resolves the call during a static link, the branch 3065 unsurprisingly just goes to .foo and the .opd information is unused. 3066 If the function definition is in a shared library, things are a little 3067 different: The call goes via a plt call stub, the opd information gets 3068 copied to the plt, and the linker patches the nop. 3069 3070 . x: 3071 . bl .foo_stub 3072 . ld 2,40(1) 3073 . 3074 . 3075 . .foo_stub: 3076 . addis 12,2,Lfoo@toc@ha # in practice, the call stub 3077 . addi 12,12,Lfoo@toc@l # is slightly optimized, but 3078 . std 2,40(1) # this is the general idea 3079 . ld 11,0(12) 3080 . ld 2,8(12) 3081 . mtctr 11 3082 . ld 11,16(12) 3083 . bctr 3084 . 3085 . .section .plt 3086 . Lfoo: reloc (R_PPC64_JMP_SLOT, foo) 3087 3088 The "reloc ()" notation is supposed to indicate that the linker emits 3089 an R_PPC64_JMP_SLOT reloc against foo. The dynamic linker does the opd 3090 copying. 3091 3092 What are the difficulties here? Well, firstly, the relocations 3093 examined by the linker in check_relocs are against the function code 3094 sym .foo, while the dynamic relocation in the plt is emitted against 3095 the function descriptor symbol, foo. Somewhere along the line, we need 3096 to carefully copy dynamic link information from one symbol to the other. 3097 Secondly, the generic part of the elf linker will make .foo a dynamic 3098 symbol as is normal for most other backends. We need foo dynamic 3099 instead, at least for an application final link. However, when 3100 creating a shared library containing foo, we need to have both symbols 3101 dynamic so that references to .foo are satisfied during the early 3102 stages of linking. Otherwise the linker might decide to pull in a 3103 definition from some other object, eg. a static library. 3104 3105 Update: As of August 2004, we support a new convention. Function 3106 calls may use the function descriptor symbol, ie. "bl foo". This 3107 behaves exactly as "bl .foo". */ 3108 3109/* The linker needs to keep track of the number of relocs that it 3110 decides to copy as dynamic relocs in check_relocs for each symbol. 3111 This is so that it can later discard them if they are found to be 3112 unnecessary. We store the information in a field extending the 3113 regular ELF linker hash table. */ 3114 3115struct ppc_dyn_relocs 3116{ 3117 struct ppc_dyn_relocs *next; 3118 3119 /* The input section of the reloc. */ 3120 asection *sec; 3121 3122 /* Total number of relocs copied for the input section. */ 3123 bfd_size_type count; 3124 3125 /* Number of pc-relative relocs copied for the input section. */ 3126 bfd_size_type pc_count; 3127}; 3128 3129/* Track GOT entries needed for a given symbol. We might need more 3130 than one got entry per symbol. */ 3131struct got_entry 3132{ 3133 struct got_entry *next; 3134 3135 /* The symbol addend that we'll be placing in the GOT. */ 3136 bfd_vma addend; 3137 3138 /* Unlike other ELF targets, we use separate GOT entries for the same 3139 symbol referenced from different input files. This is to support 3140 automatic multiple TOC/GOT sections, where the TOC base can vary 3141 from one input file to another. 3142 3143 Point to the BFD owning this GOT entry. */ 3144 bfd *owner; 3145 3146 /* Zero for non-tls entries, or TLS_TLS and one of TLS_GD, TLS_LD, 3147 TLS_TPREL or TLS_DTPREL for tls entries. */ 3148 char tls_type; 3149 3150 /* Reference count until size_dynamic_sections, GOT offset thereafter. */ 3151 union 3152 { 3153 bfd_signed_vma refcount; 3154 bfd_vma offset; 3155 } got; 3156}; 3157 3158/* The same for PLT. */ 3159struct plt_entry 3160{ 3161 struct plt_entry *next; 3162 3163 bfd_vma addend; 3164 3165 union 3166 { 3167 bfd_signed_vma refcount; 3168 bfd_vma offset; 3169 } plt; 3170}; 3171 3172/* Of those relocs that might be copied as dynamic relocs, this macro 3173 selects those that must be copied when linking a shared library, 3174 even when the symbol is local. */ 3175 3176#define MUST_BE_DYN_RELOC(RTYPE) \ 3177 ((RTYPE) != R_PPC64_REL32 \ 3178 && (RTYPE) != R_PPC64_REL64 \ 3179 && (RTYPE) != R_PPC64_REL30) 3180 3181/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 3182 copying dynamic variables from a shared lib into an app's dynbss 3183 section, and instead use a dynamic relocation to point into the 3184 shared lib. With code that gcc generates, it's vital that this be 3185 enabled; In the PowerPC64 ABI, the address of a function is actually 3186 the address of a function descriptor, which resides in the .opd 3187 section. gcc uses the descriptor directly rather than going via the 3188 GOT as some other ABI's do, which means that initialized function 3189 pointers must reference the descriptor. Thus, a function pointer 3190 initialized to the address of a function in a shared library will 3191 either require a copy reloc, or a dynamic reloc. Using a copy reloc 3192 redefines the function descriptor symbol to point to the copy. This 3193 presents a problem as a plt entry for that function is also 3194 initialized from the function descriptor symbol and the copy reloc 3195 may not be initialized first. */ 3196#define ELIMINATE_COPY_RELOCS 1 3197 3198/* Section name for stubs is the associated section name plus this 3199 string. */ 3200#define STUB_SUFFIX ".stub" 3201 3202/* Linker stubs. 3203 ppc_stub_long_branch: 3204 Used when a 14 bit branch (or even a 24 bit branch) can't reach its 3205 destination, but a 24 bit branch in a stub section will reach. 3206 . b dest 3207 3208 ppc_stub_plt_branch: 3209 Similar to the above, but a 24 bit branch in the stub section won't 3210 reach its destination. 3211 . addis %r12,%r2,xxx@toc@ha 3212 . ld %r11,xxx@toc@l(%r12) 3213 . mtctr %r11 3214 . bctr 3215 3216 ppc_stub_plt_call: 3217 Used to call a function in a shared library. If it so happens that 3218 the plt entry referenced crosses a 64k boundary, then an extra 3219 "addis %r12,%r12,1" will be inserted before the load at xxx+8 or 3220 xxx+16 as appropriate. 3221 . addis %r12,%r2,xxx@toc@ha 3222 . std %r2,40(%r1) 3223 . ld %r11,xxx+0@toc@l(%r12) 3224 . ld %r2,xxx+8@toc@l(%r12) 3225 . mtctr %r11 3226 . ld %r11,xxx+16@toc@l(%r12) 3227 . bctr 3228 3229 ppc_stub_long_branch and ppc_stub_plt_branch may also have additional 3230 code to adjust the value and save r2 to support multiple toc sections. 3231 A ppc_stub_long_branch with an r2 offset looks like: 3232 . std %r2,40(%r1) 3233 . addis %r2,%r2,off@ha 3234 . addi %r2,%r2,off@l 3235 . b dest 3236 3237 A ppc_stub_plt_branch with an r2 offset looks like: 3238 . std %r2,40(%r1) 3239 . addis %r12,%r2,xxx@toc@ha 3240 . ld %r11,xxx@toc@l(%r12) 3241 . addis %r2,%r2,off@ha 3242 . addi %r2,%r2,off@l 3243 . mtctr %r11 3244 . bctr 3245*/ 3246 3247enum ppc_stub_type { 3248 ppc_stub_none, 3249 ppc_stub_long_branch, 3250 ppc_stub_long_branch_r2off, 3251 ppc_stub_plt_branch, 3252 ppc_stub_plt_branch_r2off, 3253 ppc_stub_plt_call 3254}; 3255 3256struct ppc_stub_hash_entry { 3257 3258 /* Base hash table entry structure. */ 3259 struct bfd_hash_entry root; 3260 3261 enum ppc_stub_type stub_type; 3262 3263 /* The stub section. */ 3264 asection *stub_sec; 3265 3266 /* Offset within stub_sec of the beginning of this stub. */ 3267 bfd_vma stub_offset; 3268 3269 /* Given the symbol's value and its section we can determine its final 3270 value when building the stubs (so the stub knows where to jump. */ 3271 bfd_vma target_value; 3272 asection *target_section; 3273 3274 /* The symbol table entry, if any, that this was derived from. */ 3275 struct ppc_link_hash_entry *h; 3276 3277 /* And the reloc addend that this was derived from. */ 3278 bfd_vma addend; 3279 3280 /* Where this stub is being called from, or, in the case of combined 3281 stub sections, the first input section in the group. */ 3282 asection *id_sec; 3283}; 3284 3285struct ppc_branch_hash_entry { 3286 3287 /* Base hash table entry structure. */ 3288 struct bfd_hash_entry root; 3289 3290 /* Offset within branch lookup table. */ 3291 unsigned int offset; 3292 3293 /* Generation marker. */ 3294 unsigned int iter; 3295}; 3296 3297struct ppc_link_hash_entry 3298{ 3299 struct elf_link_hash_entry elf; 3300 3301 union { 3302 /* A pointer to the most recently used stub hash entry against this 3303 symbol. */ 3304 struct ppc_stub_hash_entry *stub_cache; 3305 3306 /* A pointer to the next symbol starting with a '.' */ 3307 struct ppc_link_hash_entry *next_dot_sym; 3308 } u; 3309 3310 /* Track dynamic relocs copied for this symbol. */ 3311 struct ppc_dyn_relocs *dyn_relocs; 3312 3313 /* Link between function code and descriptor symbols. */ 3314 struct ppc_link_hash_entry *oh; 3315 3316 /* Flag function code and descriptor symbols. */ 3317 unsigned int is_func:1; 3318 unsigned int is_func_descriptor:1; 3319 unsigned int fake:1; 3320 3321 /* Whether global opd/toc sym has been adjusted or not. 3322 After ppc64_elf_edit_opd/ppc64_elf_edit_toc has run, this flag 3323 should be set for all globals defined in any opd/toc section. */ 3324 unsigned int adjust_done:1; 3325 3326 /* Set if we twiddled this symbol to weak at some stage. */ 3327 unsigned int was_undefined:1; 3328 3329 /* Contexts in which symbol is used in the GOT (or TOC). 3330 TLS_GD .. TLS_EXPLICIT bits are or'd into the mask as the 3331 corresponding relocs are encountered during check_relocs. 3332 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to 3333 indicate the corresponding GOT entry type is not needed. 3334 tls_optimize may also set TLS_TPRELGD when a GD reloc turns into 3335 a TPREL one. We use a separate flag rather than setting TPREL 3336 just for convenience in distinguishing the two cases. */ 3337#define TLS_GD 1 /* GD reloc. */ 3338#define TLS_LD 2 /* LD reloc. */ 3339#define TLS_TPREL 4 /* TPREL reloc, => IE. */ 3340#define TLS_DTPREL 8 /* DTPREL reloc, => LD. */ 3341#define TLS_TLS 16 /* Any TLS reloc. */ 3342#define TLS_EXPLICIT 32 /* Marks TOC section TLS relocs. */ 3343#define TLS_TPRELGD 64 /* TPREL reloc resulting from GD->IE. */ 3344 char tls_mask; 3345}; 3346 3347/* ppc64 ELF linker hash table. */ 3348 3349struct ppc_link_hash_table 3350{ 3351 struct elf_link_hash_table elf; 3352 3353 /* The stub hash table. */ 3354 struct bfd_hash_table stub_hash_table; 3355 3356 /* Another hash table for plt_branch stubs. */ 3357 struct bfd_hash_table branch_hash_table; 3358 3359 /* Linker stub bfd. */ 3360 bfd *stub_bfd; 3361 3362 /* Linker call-backs. */ 3363 asection * (*add_stub_section) (const char *, asection *); 3364 void (*layout_sections_again) (void); 3365 3366 /* Array to keep track of which stub sections have been created, and 3367 information on stub grouping. */ 3368 struct map_stub { 3369 /* This is the section to which stubs in the group will be attached. */ 3370 asection *link_sec; 3371 /* The stub section. */ 3372 asection *stub_sec; 3373 /* Along with elf_gp, specifies the TOC pointer used in this group. */ 3374 bfd_vma toc_off; 3375 } *stub_group; 3376 3377 /* Temp used when calculating TOC pointers. */ 3378 bfd_vma toc_curr; 3379 3380 /* Highest input section id. */ 3381 int top_id; 3382 3383 /* Highest output section index. */ 3384 int top_index; 3385 3386 /* Used when adding symbols. */ 3387 struct ppc_link_hash_entry *dot_syms; 3388 3389 /* List of input sections for each output section. */ 3390 asection **input_list; 3391 3392 /* Short-cuts to get to dynamic linker sections. */ 3393 asection *got; 3394 asection *plt; 3395 asection *relplt; 3396 asection *dynbss; 3397 asection *relbss; 3398 asection *glink; 3399 asection *sfpr; 3400 asection *brlt; 3401 asection *relbrlt; 3402 3403 /* Shortcut to .__tls_get_addr and __tls_get_addr. */ 3404 struct ppc_link_hash_entry *tls_get_addr; 3405 struct ppc_link_hash_entry *tls_get_addr_fd; 3406 3407 /* Statistics. */ 3408 unsigned long stub_count[ppc_stub_plt_call]; 3409 3410 /* Number of stubs against global syms. */ 3411 unsigned long stub_globals; 3412 3413 /* Set if we should emit symbols for stubs. */ 3414 unsigned int emit_stub_syms:1; 3415 3416 /* Support for multiple toc sections. */ 3417 unsigned int no_multi_toc:1; 3418 unsigned int multi_toc_needed:1; 3419 3420 /* Set on error. */ 3421 unsigned int stub_error:1; 3422 3423 /* Temp used by ppc64_elf_check_directives. */ 3424 unsigned int twiddled_syms:1; 3425 3426 /* Incremented every time we size stubs. */ 3427 unsigned int stub_iteration; 3428 3429 /* Small local sym to section mapping cache. */ 3430 struct sym_sec_cache sym_sec; 3431}; 3432 3433/* Rename some of the generic section flags to better document how they 3434 are used here. */ 3435#define has_toc_reloc has_gp_reloc 3436#define makes_toc_func_call need_finalize_relax 3437#define call_check_in_progress reloc_done 3438 3439/* Get the ppc64 ELF linker hash table from a link_info structure. */ 3440 3441#define ppc_hash_table(p) \ 3442 ((struct ppc_link_hash_table *) ((p)->hash)) 3443 3444#define ppc_stub_hash_lookup(table, string, create, copy) \ 3445 ((struct ppc_stub_hash_entry *) \ 3446 bfd_hash_lookup ((table), (string), (create), (copy))) 3447 3448#define ppc_branch_hash_lookup(table, string, create, copy) \ 3449 ((struct ppc_branch_hash_entry *) \ 3450 bfd_hash_lookup ((table), (string), (create), (copy))) 3451 3452/* Create an entry in the stub hash table. */ 3453 3454static struct bfd_hash_entry * 3455stub_hash_newfunc (struct bfd_hash_entry *entry, 3456 struct bfd_hash_table *table, 3457 const char *string) 3458{ 3459 /* Allocate the structure if it has not already been allocated by a 3460 subclass. */ 3461 if (entry == NULL) 3462 { 3463 entry = bfd_hash_allocate (table, sizeof (struct ppc_stub_hash_entry)); 3464 if (entry == NULL) 3465 return entry; 3466 } 3467 3468 /* Call the allocation method of the superclass. */ 3469 entry = bfd_hash_newfunc (entry, table, string); 3470 if (entry != NULL) 3471 { 3472 struct ppc_stub_hash_entry *eh; 3473 3474 /* Initialize the local fields. */ 3475 eh = (struct ppc_stub_hash_entry *) entry; 3476 eh->stub_type = ppc_stub_none; 3477 eh->stub_sec = NULL; 3478 eh->stub_offset = 0; 3479 eh->target_value = 0; 3480 eh->target_section = NULL; 3481 eh->h = NULL; 3482 eh->id_sec = NULL; 3483 } 3484 3485 return entry; 3486} 3487 3488/* Create an entry in the branch hash table. */ 3489 3490static struct bfd_hash_entry * 3491branch_hash_newfunc (struct bfd_hash_entry *entry, 3492 struct bfd_hash_table *table, 3493 const char *string) 3494{ 3495 /* Allocate the structure if it has not already been allocated by a 3496 subclass. */ 3497 if (entry == NULL) 3498 { 3499 entry = bfd_hash_allocate (table, sizeof (struct ppc_branch_hash_entry)); 3500 if (entry == NULL) 3501 return entry; 3502 } 3503 3504 /* Call the allocation method of the superclass. */ 3505 entry = bfd_hash_newfunc (entry, table, string); 3506 if (entry != NULL) 3507 { 3508 struct ppc_branch_hash_entry *eh; 3509 3510 /* Initialize the local fields. */ 3511 eh = (struct ppc_branch_hash_entry *) entry; 3512 eh->offset = 0; 3513 eh->iter = 0; 3514 } 3515 3516 return entry; 3517} 3518 3519/* Create an entry in a ppc64 ELF linker hash table. */ 3520 3521static struct bfd_hash_entry * 3522link_hash_newfunc (struct bfd_hash_entry *entry, 3523 struct bfd_hash_table *table, 3524 const char *string) 3525{ 3526 /* Allocate the structure if it has not already been allocated by a 3527 subclass. */ 3528 if (entry == NULL) 3529 { 3530 entry = bfd_hash_allocate (table, sizeof (struct ppc_link_hash_entry)); 3531 if (entry == NULL) 3532 return entry; 3533 } 3534 3535 /* Call the allocation method of the superclass. */ 3536 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 3537 if (entry != NULL) 3538 { 3539 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) entry; 3540 3541 memset (&eh->u.stub_cache, 0, 3542 (sizeof (struct ppc_link_hash_entry) 3543 - offsetof (struct ppc_link_hash_entry, u.stub_cache))); 3544 3545 /* When making function calls, old ABI code references function entry 3546 points (dot symbols), while new ABI code references the function 3547 descriptor symbol. We need to make any combination of reference and 3548 definition work together, without breaking archive linking. 3549 3550 For a defined function "foo" and an undefined call to "bar": 3551 An old object defines "foo" and ".foo", references ".bar" (possibly 3552 "bar" too). 3553 A new object defines "foo" and references "bar". 3554 3555 A new object thus has no problem with its undefined symbols being 3556 satisfied by definitions in an old object. On the other hand, the 3557 old object won't have ".bar" satisfied by a new object. 3558 3559 Keep a list of newly added dot-symbols. */ 3560 3561 if (string[0] == '.') 3562 { 3563 struct ppc_link_hash_table *htab; 3564 3565 htab = (struct ppc_link_hash_table *) table; 3566 eh->u.next_dot_sym = htab->dot_syms; 3567 htab->dot_syms = eh; 3568 } 3569 } 3570 3571 return entry; 3572} 3573 3574/* Create a ppc64 ELF linker hash table. */ 3575 3576static struct bfd_link_hash_table * 3577ppc64_elf_link_hash_table_create (bfd *abfd) 3578{ 3579 struct ppc_link_hash_table *htab; 3580 bfd_size_type amt = sizeof (struct ppc_link_hash_table); 3581 3582 htab = bfd_zmalloc (amt); 3583 if (htab == NULL) 3584 return NULL; 3585 3586 if (!_bfd_elf_link_hash_table_init (&htab->elf, abfd, link_hash_newfunc, 3587 sizeof (struct ppc_link_hash_entry))) 3588 { 3589 free (htab); 3590 return NULL; 3591 } 3592 3593 /* Init the stub hash table too. */ 3594 if (!bfd_hash_table_init (&htab->stub_hash_table, stub_hash_newfunc, 3595 sizeof (struct ppc_stub_hash_entry))) 3596 return NULL; 3597 3598 /* And the branch hash table. */ 3599 if (!bfd_hash_table_init (&htab->branch_hash_table, branch_hash_newfunc, 3600 sizeof (struct ppc_branch_hash_entry))) 3601 return NULL; 3602 3603 /* Initializing two fields of the union is just cosmetic. We really 3604 only care about glist, but when compiled on a 32-bit host the 3605 bfd_vma fields are larger. Setting the bfd_vma to zero makes 3606 debugger inspection of these fields look nicer. */ 3607 htab->elf.init_got_refcount.refcount = 0; 3608 htab->elf.init_got_refcount.glist = NULL; 3609 htab->elf.init_plt_refcount.refcount = 0; 3610 htab->elf.init_plt_refcount.glist = NULL; 3611 htab->elf.init_got_offset.offset = 0; 3612 htab->elf.init_got_offset.glist = NULL; 3613 htab->elf.init_plt_offset.offset = 0; 3614 htab->elf.init_plt_offset.glist = NULL; 3615 3616 return &htab->elf.root; 3617} 3618 3619/* Free the derived linker hash table. */ 3620 3621static void 3622ppc64_elf_link_hash_table_free (struct bfd_link_hash_table *hash) 3623{ 3624 struct ppc_link_hash_table *ret = (struct ppc_link_hash_table *) hash; 3625 3626 bfd_hash_table_free (&ret->stub_hash_table); 3627 bfd_hash_table_free (&ret->branch_hash_table); 3628 _bfd_generic_link_hash_table_free (hash); 3629} 3630 3631/* Satisfy the ELF linker by filling in some fields in our fake bfd. */ 3632 3633void 3634ppc64_elf_init_stub_bfd (bfd *abfd, struct bfd_link_info *info) 3635{ 3636 struct ppc_link_hash_table *htab; 3637 3638 elf_elfheader (abfd)->e_ident[EI_CLASS] = ELFCLASS64; 3639 3640/* Always hook our dynamic sections into the first bfd, which is the 3641 linker created stub bfd. This ensures that the GOT header is at 3642 the start of the output TOC section. */ 3643 htab = ppc_hash_table (info); 3644 htab->stub_bfd = abfd; 3645 htab->elf.dynobj = abfd; 3646} 3647 3648/* Build a name for an entry in the stub hash table. */ 3649 3650static char * 3651ppc_stub_name (const asection *input_section, 3652 const asection *sym_sec, 3653 const struct ppc_link_hash_entry *h, 3654 const Elf_Internal_Rela *rel) 3655{ 3656 char *stub_name; 3657 bfd_size_type len; 3658 3659 /* rel->r_addend is actually 64 bit, but who uses more than +/- 2^31 3660 offsets from a sym as a branch target? In fact, we could 3661 probably assume the addend is always zero. */ 3662 BFD_ASSERT (((int) rel->r_addend & 0xffffffff) == rel->r_addend); 3663 3664 if (h) 3665 { 3666 len = 8 + 1 + strlen (h->elf.root.root.string) + 1 + 8 + 1; 3667 stub_name = bfd_malloc (len); 3668 if (stub_name == NULL) 3669 return stub_name; 3670 3671 sprintf (stub_name, "%08x.%s+%x", 3672 input_section->id & 0xffffffff, 3673 h->elf.root.root.string, 3674 (int) rel->r_addend & 0xffffffff); 3675 } 3676 else 3677 { 3678 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1; 3679 stub_name = bfd_malloc (len); 3680 if (stub_name == NULL) 3681 return stub_name; 3682 3683 sprintf (stub_name, "%08x.%x:%x+%x", 3684 input_section->id & 0xffffffff, 3685 sym_sec->id & 0xffffffff, 3686 (int) ELF64_R_SYM (rel->r_info) & 0xffffffff, 3687 (int) rel->r_addend & 0xffffffff); 3688 } 3689 if (stub_name[len - 2] == '+' && stub_name[len - 1] == '0') 3690 stub_name[len - 2] = 0; 3691 return stub_name; 3692} 3693 3694/* Look up an entry in the stub hash. Stub entries are cached because 3695 creating the stub name takes a bit of time. */ 3696 3697static struct ppc_stub_hash_entry * 3698ppc_get_stub_entry (const asection *input_section, 3699 const asection *sym_sec, 3700 struct ppc_link_hash_entry *h, 3701 const Elf_Internal_Rela *rel, 3702 struct ppc_link_hash_table *htab) 3703{ 3704 struct ppc_stub_hash_entry *stub_entry; 3705 const asection *id_sec; 3706 3707 /* If this input section is part of a group of sections sharing one 3708 stub section, then use the id of the first section in the group. 3709 Stub names need to include a section id, as there may well be 3710 more than one stub used to reach say, printf, and we need to 3711 distinguish between them. */ 3712 id_sec = htab->stub_group[input_section->id].link_sec; 3713 3714 if (h != NULL && h->u.stub_cache != NULL 3715 && h->u.stub_cache->h == h 3716 && h->u.stub_cache->id_sec == id_sec) 3717 { 3718 stub_entry = h->u.stub_cache; 3719 } 3720 else 3721 { 3722 char *stub_name; 3723 3724 stub_name = ppc_stub_name (id_sec, sym_sec, h, rel); 3725 if (stub_name == NULL) 3726 return NULL; 3727 3728 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, 3729 stub_name, FALSE, FALSE); 3730 if (h != NULL) 3731 h->u.stub_cache = stub_entry; 3732 3733 free (stub_name); 3734 } 3735 3736 return stub_entry; 3737} 3738 3739/* Add a new stub entry to the stub hash. Not all fields of the new 3740 stub entry are initialised. */ 3741 3742static struct ppc_stub_hash_entry * 3743ppc_add_stub (const char *stub_name, 3744 asection *section, 3745 struct ppc_link_hash_table *htab) 3746{ 3747 asection *link_sec; 3748 asection *stub_sec; 3749 struct ppc_stub_hash_entry *stub_entry; 3750 3751 link_sec = htab->stub_group[section->id].link_sec; 3752 stub_sec = htab->stub_group[section->id].stub_sec; 3753 if (stub_sec == NULL) 3754 { 3755 stub_sec = htab->stub_group[link_sec->id].stub_sec; 3756 if (stub_sec == NULL) 3757 { 3758 size_t namelen; 3759 bfd_size_type len; 3760 char *s_name; 3761 3762 namelen = strlen (link_sec->name); 3763 len = namelen + sizeof (STUB_SUFFIX); 3764 s_name = bfd_alloc (htab->stub_bfd, len); 3765 if (s_name == NULL) 3766 return NULL; 3767 3768 memcpy (s_name, link_sec->name, namelen); 3769 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX)); 3770 stub_sec = (*htab->add_stub_section) (s_name, link_sec); 3771 if (stub_sec == NULL) 3772 return NULL; 3773 htab->stub_group[link_sec->id].stub_sec = stub_sec; 3774 } 3775 htab->stub_group[section->id].stub_sec = stub_sec; 3776 } 3777 3778 /* Enter this entry into the linker stub hash table. */ 3779 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, stub_name, 3780 TRUE, FALSE); 3781 if (stub_entry == NULL) 3782 { 3783 (*_bfd_error_handler) (_("%B: cannot create stub entry %s"), 3784 section->owner, stub_name); 3785 return NULL; 3786 } 3787 3788 stub_entry->stub_sec = stub_sec; 3789 stub_entry->stub_offset = 0; 3790 stub_entry->id_sec = link_sec; 3791 return stub_entry; 3792} 3793 3794/* Create sections for linker generated code. */ 3795 3796static bfd_boolean 3797create_linkage_sections (bfd *dynobj, struct bfd_link_info *info) 3798{ 3799 struct ppc_link_hash_table *htab; 3800 flagword flags; 3801 3802 htab = ppc_hash_table (info); 3803 3804 /* Create .sfpr for code to save and restore fp regs. */ 3805 flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_READONLY 3806 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3807 htab->sfpr = bfd_make_section_anyway_with_flags (dynobj, ".sfpr", 3808 flags); 3809 if (htab->sfpr == NULL 3810 || ! bfd_set_section_alignment (dynobj, htab->sfpr, 2)) 3811 return FALSE; 3812 3813 /* Create .glink for lazy dynamic linking support. */ 3814 htab->glink = bfd_make_section_anyway_with_flags (dynobj, ".glink", 3815 flags); 3816 if (htab->glink == NULL 3817 || ! bfd_set_section_alignment (dynobj, htab->glink, 3)) 3818 return FALSE; 3819 3820 /* Create branch lookup table for plt_branch stubs. */ 3821 if (info->shared) 3822 { 3823 flags = (SEC_ALLOC | SEC_LOAD 3824 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3825 htab->brlt 3826 = bfd_make_section_anyway_with_flags (dynobj, ".data.rel.ro.brlt", 3827 flags); 3828 } 3829 else 3830 { 3831 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY 3832 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3833 htab->brlt 3834 = bfd_make_section_anyway_with_flags (dynobj, ".rodata.brlt", flags); 3835 } 3836 3837 if (htab->brlt == NULL 3838 || ! bfd_set_section_alignment (dynobj, htab->brlt, 3)) 3839 return FALSE; 3840 3841 if (info->shared) 3842 { 3843 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY 3844 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3845 htab->relbrlt 3846 = bfd_make_section_anyway_with_flags (dynobj, ".rela.data.rel.ro.brlt", 3847 flags); 3848 } 3849 else if (info->emitrelocations) 3850 { 3851 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY 3852 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3853 htab->relbrlt 3854 = bfd_make_section_anyway_with_flags (dynobj, ".rela.rodata.brlt", 3855 flags); 3856 } 3857 else 3858 return TRUE; 3859 3860 if (!htab->relbrlt 3861 || ! bfd_set_section_alignment (dynobj, htab->relbrlt, 3)) 3862 return FALSE; 3863 3864 return TRUE; 3865} 3866 3867/* Create .got and .rela.got sections in ABFD, and .got in dynobj if 3868 not already done. */ 3869 3870static bfd_boolean 3871create_got_section (bfd *abfd, struct bfd_link_info *info) 3872{ 3873 asection *got, *relgot; 3874 flagword flags; 3875 struct ppc_link_hash_table *htab = ppc_hash_table (info); 3876 3877 if (!htab->got) 3878 { 3879 if (! _bfd_elf_create_got_section (htab->elf.dynobj, info)) 3880 return FALSE; 3881 3882 htab->got = bfd_get_section_by_name (htab->elf.dynobj, ".got"); 3883 if (!htab->got) 3884 abort (); 3885 } 3886 3887 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 3888 | SEC_LINKER_CREATED); 3889 3890 got = bfd_make_section_anyway_with_flags (abfd, ".got", flags); 3891 if (!got 3892 || !bfd_set_section_alignment (abfd, got, 3)) 3893 return FALSE; 3894 3895 relgot = bfd_make_section_anyway_with_flags (abfd, ".rela.got", 3896 flags | SEC_READONLY); 3897 if (!relgot 3898 || ! bfd_set_section_alignment (abfd, relgot, 3)) 3899 return FALSE; 3900 3901 ppc64_elf_tdata (abfd)->got = got; 3902 ppc64_elf_tdata (abfd)->relgot = relgot; 3903 return TRUE; 3904} 3905 3906/* Create the dynamic sections, and set up shortcuts. */ 3907 3908static bfd_boolean 3909ppc64_elf_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 3910{ 3911 struct ppc_link_hash_table *htab; 3912 3913 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 3914 return FALSE; 3915 3916 htab = ppc_hash_table (info); 3917 if (!htab->got) 3918 htab->got = bfd_get_section_by_name (dynobj, ".got"); 3919 htab->plt = bfd_get_section_by_name (dynobj, ".plt"); 3920 htab->relplt = bfd_get_section_by_name (dynobj, ".rela.plt"); 3921 htab->dynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 3922 if (!info->shared) 3923 htab->relbss = bfd_get_section_by_name (dynobj, ".rela.bss"); 3924 3925 if (!htab->got || !htab->plt || !htab->relplt || !htab->dynbss 3926 || (!info->shared && !htab->relbss)) 3927 abort (); 3928 3929 return TRUE; 3930} 3931 3932/* Merge PLT info on FROM with that on TO. */ 3933 3934static void 3935move_plt_plist (struct ppc_link_hash_entry *from, 3936 struct ppc_link_hash_entry *to) 3937{ 3938 if (from->elf.plt.plist != NULL) 3939 { 3940 if (to->elf.plt.plist != NULL) 3941 { 3942 struct plt_entry **entp; 3943 struct plt_entry *ent; 3944 3945 for (entp = &from->elf.plt.plist; (ent = *entp) != NULL; ) 3946 { 3947 struct plt_entry *dent; 3948 3949 for (dent = to->elf.plt.plist; dent != NULL; dent = dent->next) 3950 if (dent->addend == ent->addend) 3951 { 3952 dent->plt.refcount += ent->plt.refcount; 3953 *entp = ent->next; 3954 break; 3955 } 3956 if (dent == NULL) 3957 entp = &ent->next; 3958 } 3959 *entp = to->elf.plt.plist; 3960 } 3961 3962 to->elf.plt.plist = from->elf.plt.plist; 3963 from->elf.plt.plist = NULL; 3964 } 3965} 3966 3967/* Copy the extra info we tack onto an elf_link_hash_entry. */ 3968 3969static void 3970ppc64_elf_copy_indirect_symbol (struct bfd_link_info *info, 3971 struct elf_link_hash_entry *dir, 3972 struct elf_link_hash_entry *ind) 3973{ 3974 struct ppc_link_hash_entry *edir, *eind; 3975 3976 edir = (struct ppc_link_hash_entry *) dir; 3977 eind = (struct ppc_link_hash_entry *) ind; 3978 3979 /* Copy over any dynamic relocs we may have on the indirect sym. */ 3980 if (eind->dyn_relocs != NULL) 3981 { 3982 if (edir->dyn_relocs != NULL) 3983 { 3984 struct ppc_dyn_relocs **pp; 3985 struct ppc_dyn_relocs *p; 3986 3987 /* Add reloc counts against the indirect sym to the direct sym 3988 list. Merge any entries against the same section. */ 3989 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 3990 { 3991 struct ppc_dyn_relocs *q; 3992 3993 for (q = edir->dyn_relocs; q != NULL; q = q->next) 3994 if (q->sec == p->sec) 3995 { 3996 q->pc_count += p->pc_count; 3997 q->count += p->count; 3998 *pp = p->next; 3999 break; 4000 } 4001 if (q == NULL) 4002 pp = &p->next; 4003 } 4004 *pp = edir->dyn_relocs; 4005 } 4006 4007 edir->dyn_relocs = eind->dyn_relocs; 4008 eind->dyn_relocs = NULL; 4009 } 4010 4011 edir->is_func |= eind->is_func; 4012 edir->is_func_descriptor |= eind->is_func_descriptor; 4013 edir->tls_mask |= eind->tls_mask; 4014 4015 /* If called to transfer flags for a weakdef during processing 4016 of elf_adjust_dynamic_symbol, don't copy NON_GOT_REF. 4017 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 4018 if (!(ELIMINATE_COPY_RELOCS 4019 && eind->elf.root.type != bfd_link_hash_indirect 4020 && edir->elf.dynamic_adjusted)) 4021 edir->elf.non_got_ref |= eind->elf.non_got_ref; 4022 4023 edir->elf.ref_dynamic |= eind->elf.ref_dynamic; 4024 edir->elf.ref_regular |= eind->elf.ref_regular; 4025 edir->elf.ref_regular_nonweak |= eind->elf.ref_regular_nonweak; 4026 edir->elf.needs_plt |= eind->elf.needs_plt; 4027 4028 /* If we were called to copy over info for a weak sym, that's all. */ 4029 if (eind->elf.root.type != bfd_link_hash_indirect) 4030 return; 4031 4032 /* Copy over got entries that we may have already seen to the 4033 symbol which just became indirect. */ 4034 if (eind->elf.got.glist != NULL) 4035 { 4036 if (edir->elf.got.glist != NULL) 4037 { 4038 struct got_entry **entp; 4039 struct got_entry *ent; 4040 4041 for (entp = &eind->elf.got.glist; (ent = *entp) != NULL; ) 4042 { 4043 struct got_entry *dent; 4044 4045 for (dent = edir->elf.got.glist; dent != NULL; dent = dent->next) 4046 if (dent->addend == ent->addend 4047 && dent->owner == ent->owner 4048 && dent->tls_type == ent->tls_type) 4049 { 4050 dent->got.refcount += ent->got.refcount; 4051 *entp = ent->next; 4052 break; 4053 } 4054 if (dent == NULL) 4055 entp = &ent->next; 4056 } 4057 *entp = edir->elf.got.glist; 4058 } 4059 4060 edir->elf.got.glist = eind->elf.got.glist; 4061 eind->elf.got.glist = NULL; 4062 } 4063 4064 /* And plt entries. */ 4065 move_plt_plist (eind, edir); 4066 4067 if (eind->elf.dynindx != -1) 4068 { 4069 if (edir->elf.dynindx != -1) 4070 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, 4071 edir->elf.dynstr_index); 4072 edir->elf.dynindx = eind->elf.dynindx; 4073 edir->elf.dynstr_index = eind->elf.dynstr_index; 4074 eind->elf.dynindx = -1; 4075 eind->elf.dynstr_index = 0; 4076 } 4077} 4078 4079/* Find the function descriptor hash entry from the given function code 4080 hash entry FH. Link the entries via their OH fields. */ 4081 4082static struct ppc_link_hash_entry * 4083get_fdh (struct ppc_link_hash_entry *fh, struct ppc_link_hash_table *htab) 4084{ 4085 struct ppc_link_hash_entry *fdh = fh->oh; 4086 4087 if (fdh == NULL) 4088 { 4089 const char *fd_name = fh->elf.root.root.string + 1; 4090 4091 fdh = (struct ppc_link_hash_entry *) 4092 elf_link_hash_lookup (&htab->elf, fd_name, FALSE, FALSE, FALSE); 4093 if (fdh != NULL) 4094 { 4095 fdh->is_func_descriptor = 1; 4096 fdh->oh = fh; 4097 fh->is_func = 1; 4098 fh->oh = fdh; 4099 } 4100 } 4101 4102 return fdh; 4103} 4104 4105/* Make a fake function descriptor sym for the code sym FH. */ 4106 4107static struct ppc_link_hash_entry * 4108make_fdh (struct bfd_link_info *info, 4109 struct ppc_link_hash_entry *fh) 4110{ 4111 bfd *abfd; 4112 asymbol *newsym; 4113 struct bfd_link_hash_entry *bh; 4114 struct ppc_link_hash_entry *fdh; 4115 4116 abfd = fh->elf.root.u.undef.abfd; 4117 newsym = bfd_make_empty_symbol (abfd); 4118 newsym->name = fh->elf.root.root.string + 1; 4119 newsym->section = bfd_und_section_ptr; 4120 newsym->value = 0; 4121 newsym->flags = BSF_WEAK; 4122 4123 bh = NULL; 4124 if (!_bfd_generic_link_add_one_symbol (info, abfd, newsym->name, 4125 newsym->flags, newsym->section, 4126 newsym->value, NULL, FALSE, FALSE, 4127 &bh)) 4128 return NULL; 4129 4130 fdh = (struct ppc_link_hash_entry *) bh; 4131 fdh->elf.non_elf = 0; 4132 fdh->fake = 1; 4133 fdh->is_func_descriptor = 1; 4134 fdh->oh = fh; 4135 fh->is_func = 1; 4136 fh->oh = fdh; 4137 return fdh; 4138} 4139 4140/* Fix function descriptor symbols defined in .opd sections to be 4141 function type. */ 4142 4143static bfd_boolean 4144ppc64_elf_add_symbol_hook (bfd *ibfd ATTRIBUTE_UNUSED, 4145 struct bfd_link_info *info ATTRIBUTE_UNUSED, 4146 Elf_Internal_Sym *isym, 4147 const char **name ATTRIBUTE_UNUSED, 4148 flagword *flags ATTRIBUTE_UNUSED, 4149 asection **sec, 4150 bfd_vma *value ATTRIBUTE_UNUSED) 4151{ 4152 if (*sec != NULL 4153 && strcmp (bfd_get_section_name (ibfd, *sec), ".opd") == 0) 4154 isym->st_info = ELF_ST_INFO (ELF_ST_BIND (isym->st_info), STT_FUNC); 4155 4156 return TRUE; 4157} 4158 4159/* This function makes an old ABI object reference to ".bar" cause the 4160 inclusion of a new ABI object archive that defines "bar". 4161 NAME is a symbol defined in an archive. Return a symbol in the hash 4162 table that might be satisfied by the archive symbols. */ 4163 4164static struct elf_link_hash_entry * 4165ppc64_elf_archive_symbol_lookup (bfd *abfd, 4166 struct bfd_link_info *info, 4167 const char *name) 4168{ 4169 struct elf_link_hash_entry *h; 4170 char *dot_name; 4171 size_t len; 4172 4173 h = _bfd_elf_archive_symbol_lookup (abfd, info, name); 4174 if (h != NULL 4175 /* Don't return this sym if it is a fake function descriptor 4176 created by add_symbol_adjust. */ 4177 && !(h->root.type == bfd_link_hash_undefweak 4178 && ((struct ppc_link_hash_entry *) h)->fake)) 4179 return h; 4180 4181 if (name[0] == '.') 4182 return h; 4183 4184 len = strlen (name); 4185 dot_name = bfd_alloc (abfd, len + 2); 4186 if (dot_name == NULL) 4187 return (struct elf_link_hash_entry *) 0 - 1; 4188 dot_name[0] = '.'; 4189 memcpy (dot_name + 1, name, len + 1); 4190 h = _bfd_elf_archive_symbol_lookup (abfd, info, dot_name); 4191 bfd_release (abfd, dot_name); 4192 return h; 4193} 4194 4195/* This function satisfies all old ABI object references to ".bar" if a 4196 new ABI object defines "bar". Well, at least, undefined dot symbols 4197 are made weak. This stops later archive searches from including an 4198 object if we already have a function descriptor definition. It also 4199 prevents the linker complaining about undefined symbols. 4200 We also check and correct mismatched symbol visibility here. The 4201 most restrictive visibility of the function descriptor and the 4202 function entry symbol is used. */ 4203 4204static bfd_boolean 4205add_symbol_adjust (struct ppc_link_hash_entry *eh, struct bfd_link_info *info) 4206{ 4207 struct ppc_link_hash_table *htab; 4208 struct ppc_link_hash_entry *fdh; 4209 4210 if (eh->elf.root.type == bfd_link_hash_indirect) 4211 return TRUE; 4212 4213 if (eh->elf.root.type == bfd_link_hash_warning) 4214 eh = (struct ppc_link_hash_entry *) eh->elf.root.u.i.link; 4215 4216 if (eh->elf.root.root.string[0] != '.') 4217 abort (); 4218 4219 htab = ppc_hash_table (info); 4220 fdh = get_fdh (eh, htab); 4221 if (fdh == NULL 4222 && !info->relocatable 4223 && (eh->elf.root.type == bfd_link_hash_undefined 4224 || eh->elf.root.type == bfd_link_hash_undefweak) 4225 && eh->elf.ref_regular) 4226 { 4227 /* Make an undefweak function descriptor sym, which is enough to 4228 pull in an --as-needed shared lib, but won't cause link 4229 errors. Archives are handled elsewhere. */ 4230 fdh = make_fdh (info, eh); 4231 if (fdh == NULL) 4232 return FALSE; 4233 else 4234 fdh->elf.ref_regular = 1; 4235 } 4236 else if (fdh != NULL) 4237 { 4238 unsigned entry_vis = ELF_ST_VISIBILITY (eh->elf.other) - 1; 4239 unsigned descr_vis = ELF_ST_VISIBILITY (fdh->elf.other) - 1; 4240 if (entry_vis < descr_vis) 4241 fdh->elf.other += entry_vis - descr_vis; 4242 else if (entry_vis > descr_vis) 4243 eh->elf.other += descr_vis - entry_vis; 4244 4245 if ((fdh->elf.root.type == bfd_link_hash_defined 4246 || fdh->elf.root.type == bfd_link_hash_defweak) 4247 && eh->elf.root.type == bfd_link_hash_undefined) 4248 { 4249 eh->elf.root.type = bfd_link_hash_undefweak; 4250 eh->was_undefined = 1; 4251 htab->twiddled_syms = 1; 4252 } 4253 } 4254 4255 return TRUE; 4256} 4257 4258/* Process list of dot-symbols we made in link_hash_newfunc. */ 4259 4260static bfd_boolean 4261ppc64_elf_check_directives (bfd *ibfd, struct bfd_link_info *info) 4262{ 4263 struct ppc_link_hash_table *htab; 4264 struct ppc_link_hash_entry **p, *eh; 4265 4266 htab = ppc_hash_table (info); 4267 if (!is_ppc64_elf_target (htab->elf.root.creator)) 4268 return TRUE; 4269 4270 if (is_ppc64_elf_target (ibfd->xvec)) 4271 { 4272 p = &htab->dot_syms; 4273 while ((eh = *p) != NULL) 4274 { 4275 *p = NULL; 4276 if (!add_symbol_adjust (eh, info)) 4277 return FALSE; 4278 p = &eh->u.next_dot_sym; 4279 } 4280 } 4281 4282 /* Clear the list for non-ppc64 input files. */ 4283 p = &htab->dot_syms; 4284 while ((eh = *p) != NULL) 4285 { 4286 *p = NULL; 4287 p = &eh->u.next_dot_sym; 4288 } 4289 4290 /* We need to fix the undefs list for any syms we have twiddled to 4291 undef_weak. */ 4292 if (htab->twiddled_syms) 4293 { 4294 bfd_link_repair_undef_list (&htab->elf.root); 4295 htab->twiddled_syms = 0; 4296 } 4297 return TRUE; 4298} 4299 4300/* Undo hash table changes when an --as-needed input file is determined 4301 not to be needed. */ 4302 4303static bfd_boolean 4304ppc64_elf_as_needed_cleanup (bfd *ibfd ATTRIBUTE_UNUSED, 4305 struct bfd_link_info *info) 4306{ 4307 ppc_hash_table (info)->dot_syms = NULL; 4308 return TRUE; 4309} 4310 4311static bfd_boolean 4312update_local_sym_info (bfd *abfd, Elf_Internal_Shdr *symtab_hdr, 4313 unsigned long r_symndx, bfd_vma r_addend, int tls_type) 4314{ 4315 struct got_entry **local_got_ents = elf_local_got_ents (abfd); 4316 char *local_got_tls_masks; 4317 4318 if (local_got_ents == NULL) 4319 { 4320 bfd_size_type size = symtab_hdr->sh_info; 4321 4322 size *= sizeof (*local_got_ents) + sizeof (*local_got_tls_masks); 4323 local_got_ents = bfd_zalloc (abfd, size); 4324 if (local_got_ents == NULL) 4325 return FALSE; 4326 elf_local_got_ents (abfd) = local_got_ents; 4327 } 4328 4329 if ((tls_type & TLS_EXPLICIT) == 0) 4330 { 4331 struct got_entry *ent; 4332 4333 for (ent = local_got_ents[r_symndx]; ent != NULL; ent = ent->next) 4334 if (ent->addend == r_addend 4335 && ent->owner == abfd 4336 && ent->tls_type == tls_type) 4337 break; 4338 if (ent == NULL) 4339 { 4340 bfd_size_type amt = sizeof (*ent); 4341 ent = bfd_alloc (abfd, amt); 4342 if (ent == NULL) 4343 return FALSE; 4344 ent->next = local_got_ents[r_symndx]; 4345 ent->addend = r_addend; 4346 ent->owner = abfd; 4347 ent->tls_type = tls_type; 4348 ent->got.refcount = 0; 4349 local_got_ents[r_symndx] = ent; 4350 } 4351 ent->got.refcount += 1; 4352 } 4353 4354 local_got_tls_masks = (char *) (local_got_ents + symtab_hdr->sh_info); 4355 local_got_tls_masks[r_symndx] |= tls_type; 4356 return TRUE; 4357} 4358 4359static bfd_boolean 4360update_plt_info (bfd *abfd, struct ppc_link_hash_entry *eh, bfd_vma addend) 4361{ 4362 struct plt_entry *ent; 4363 4364 for (ent = eh->elf.plt.plist; ent != NULL; ent = ent->next) 4365 if (ent->addend == addend) 4366 break; 4367 if (ent == NULL) 4368 { 4369 bfd_size_type amt = sizeof (*ent); 4370 ent = bfd_alloc (abfd, amt); 4371 if (ent == NULL) 4372 return FALSE; 4373 ent->next = eh->elf.plt.plist; 4374 ent->addend = addend; 4375 ent->plt.refcount = 0; 4376 eh->elf.plt.plist = ent; 4377 } 4378 ent->plt.refcount += 1; 4379 eh->elf.needs_plt = 1; 4380 if (eh->elf.root.root.string[0] == '.' 4381 && eh->elf.root.root.string[1] != '\0') 4382 eh->is_func = 1; 4383 return TRUE; 4384} 4385 4386/* Look through the relocs for a section during the first phase, and 4387 calculate needed space in the global offset table, procedure 4388 linkage table, and dynamic reloc sections. */ 4389 4390static bfd_boolean 4391ppc64_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, 4392 asection *sec, const Elf_Internal_Rela *relocs) 4393{ 4394 struct ppc_link_hash_table *htab; 4395 Elf_Internal_Shdr *symtab_hdr; 4396 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 4397 const Elf_Internal_Rela *rel; 4398 const Elf_Internal_Rela *rel_end; 4399 asection *sreloc; 4400 asection **opd_sym_map; 4401 4402 if (info->relocatable) 4403 return TRUE; 4404 4405 /* Don't do anything special with non-loaded, non-alloced sections. 4406 In particular, any relocs in such sections should not affect GOT 4407 and PLT reference counting (ie. we don't allow them to create GOT 4408 or PLT entries), there's no possibility or desire to optimize TLS 4409 relocs, and there's not much point in propagating relocs to shared 4410 libs that the dynamic linker won't relocate. */ 4411 if ((sec->flags & SEC_ALLOC) == 0) 4412 return TRUE; 4413 4414 htab = ppc_hash_table (info); 4415 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 4416 4417 sym_hashes = elf_sym_hashes (abfd); 4418 sym_hashes_end = (sym_hashes 4419 + symtab_hdr->sh_size / sizeof (Elf64_External_Sym) 4420 - symtab_hdr->sh_info); 4421 4422 sreloc = NULL; 4423 opd_sym_map = NULL; 4424 if (strcmp (bfd_get_section_name (abfd, sec), ".opd") == 0) 4425 { 4426 /* Garbage collection needs some extra help with .opd sections. 4427 We don't want to necessarily keep everything referenced by 4428 relocs in .opd, as that would keep all functions. Instead, 4429 if we reference an .opd symbol (a function descriptor), we 4430 want to keep the function code symbol's section. This is 4431 easy for global symbols, but for local syms we need to keep 4432 information about the associated function section. Later, if 4433 edit_opd deletes entries, we'll use this array to adjust 4434 local syms in .opd. */ 4435 union opd_info { 4436 asection *func_section; 4437 long entry_adjust; 4438 }; 4439 bfd_size_type amt; 4440 4441 amt = sec->size * sizeof (union opd_info) / 8; 4442 opd_sym_map = bfd_zalloc (abfd, amt); 4443 if (opd_sym_map == NULL) 4444 return FALSE; 4445 ppc64_elf_section_data (sec)->u.opd_func_sec = opd_sym_map; 4446 BFD_ASSERT (ppc64_elf_section_data (sec)->sec_type == sec_normal); 4447 ppc64_elf_section_data (sec)->sec_type = sec_opd; 4448 } 4449 4450 if (htab->sfpr == NULL 4451 && !create_linkage_sections (htab->elf.dynobj, info)) 4452 return FALSE; 4453 4454 rel_end = relocs + sec->reloc_count; 4455 for (rel = relocs; rel < rel_end; rel++) 4456 { 4457 unsigned long r_symndx; 4458 struct elf_link_hash_entry *h; 4459 enum elf_ppc64_reloc_type r_type; 4460 int tls_type = 0; 4461 struct _ppc64_elf_section_data *ppc64_sec; 4462 4463 r_symndx = ELF64_R_SYM (rel->r_info); 4464 if (r_symndx < symtab_hdr->sh_info) 4465 h = NULL; 4466 else 4467 { 4468 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 4469 while (h->root.type == bfd_link_hash_indirect 4470 || h->root.type == bfd_link_hash_warning) 4471 h = (struct elf_link_hash_entry *) h->root.u.i.link; 4472 } 4473 4474 r_type = ELF64_R_TYPE (rel->r_info); 4475 switch (r_type) 4476 { 4477 case R_PPC64_GOT_TLSLD16: 4478 case R_PPC64_GOT_TLSLD16_LO: 4479 case R_PPC64_GOT_TLSLD16_HI: 4480 case R_PPC64_GOT_TLSLD16_HA: 4481 ppc64_tlsld_got (abfd)->refcount += 1; 4482 tls_type = TLS_TLS | TLS_LD; 4483 goto dogottls; 4484 4485 case R_PPC64_GOT_TLSGD16: 4486 case R_PPC64_GOT_TLSGD16_LO: 4487 case R_PPC64_GOT_TLSGD16_HI: 4488 case R_PPC64_GOT_TLSGD16_HA: 4489 tls_type = TLS_TLS | TLS_GD; 4490 goto dogottls; 4491 4492 case R_PPC64_GOT_TPREL16_DS: 4493 case R_PPC64_GOT_TPREL16_LO_DS: 4494 case R_PPC64_GOT_TPREL16_HI: 4495 case R_PPC64_GOT_TPREL16_HA: 4496 if (info->shared) 4497 info->flags |= DF_STATIC_TLS; 4498 tls_type = TLS_TLS | TLS_TPREL; 4499 goto dogottls; 4500 4501 case R_PPC64_GOT_DTPREL16_DS: 4502 case R_PPC64_GOT_DTPREL16_LO_DS: 4503 case R_PPC64_GOT_DTPREL16_HI: 4504 case R_PPC64_GOT_DTPREL16_HA: 4505 tls_type = TLS_TLS | TLS_DTPREL; 4506 dogottls: 4507 sec->has_tls_reloc = 1; 4508 /* Fall thru */ 4509 4510 case R_PPC64_GOT16: 4511 case R_PPC64_GOT16_DS: 4512 case R_PPC64_GOT16_HA: 4513 case R_PPC64_GOT16_HI: 4514 case R_PPC64_GOT16_LO: 4515 case R_PPC64_GOT16_LO_DS: 4516 /* This symbol requires a global offset table entry. */ 4517 sec->has_toc_reloc = 1; 4518 if (ppc64_elf_tdata (abfd)->got == NULL 4519 && !create_got_section (abfd, info)) 4520 return FALSE; 4521 4522 if (h != NULL) 4523 { 4524 struct ppc_link_hash_entry *eh; 4525 struct got_entry *ent; 4526 4527 eh = (struct ppc_link_hash_entry *) h; 4528 for (ent = eh->elf.got.glist; ent != NULL; ent = ent->next) 4529 if (ent->addend == rel->r_addend 4530 && ent->owner == abfd 4531 && ent->tls_type == tls_type) 4532 break; 4533 if (ent == NULL) 4534 { 4535 bfd_size_type amt = sizeof (*ent); 4536 ent = bfd_alloc (abfd, amt); 4537 if (ent == NULL) 4538 return FALSE; 4539 ent->next = eh->elf.got.glist; 4540 ent->addend = rel->r_addend; 4541 ent->owner = abfd; 4542 ent->tls_type = tls_type; 4543 ent->got.refcount = 0; 4544 eh->elf.got.glist = ent; 4545 } 4546 ent->got.refcount += 1; 4547 eh->tls_mask |= tls_type; 4548 } 4549 else 4550 /* This is a global offset table entry for a local symbol. */ 4551 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx, 4552 rel->r_addend, tls_type)) 4553 return FALSE; 4554 break; 4555 4556 case R_PPC64_PLT16_HA: 4557 case R_PPC64_PLT16_HI: 4558 case R_PPC64_PLT16_LO: 4559 case R_PPC64_PLT32: 4560 case R_PPC64_PLT64: 4561 /* This symbol requires a procedure linkage table entry. We 4562 actually build the entry in adjust_dynamic_symbol, 4563 because this might be a case of linking PIC code without 4564 linking in any dynamic objects, in which case we don't 4565 need to generate a procedure linkage table after all. */ 4566 if (h == NULL) 4567 { 4568 /* It does not make sense to have a procedure linkage 4569 table entry for a local symbol. */ 4570 bfd_set_error (bfd_error_bad_value); 4571 return FALSE; 4572 } 4573 else 4574 if (!update_plt_info (abfd, (struct ppc_link_hash_entry *) h, 4575 rel->r_addend)) 4576 return FALSE; 4577 break; 4578 4579 /* The following relocations don't need to propagate the 4580 relocation if linking a shared object since they are 4581 section relative. */ 4582 case R_PPC64_SECTOFF: 4583 case R_PPC64_SECTOFF_LO: 4584 case R_PPC64_SECTOFF_HI: 4585 case R_PPC64_SECTOFF_HA: 4586 case R_PPC64_SECTOFF_DS: 4587 case R_PPC64_SECTOFF_LO_DS: 4588 case R_PPC64_DTPREL16: 4589 case R_PPC64_DTPREL16_LO: 4590 case R_PPC64_DTPREL16_HI: 4591 case R_PPC64_DTPREL16_HA: 4592 case R_PPC64_DTPREL16_DS: 4593 case R_PPC64_DTPREL16_LO_DS: 4594 case R_PPC64_DTPREL16_HIGHER: 4595 case R_PPC64_DTPREL16_HIGHERA: 4596 case R_PPC64_DTPREL16_HIGHEST: 4597 case R_PPC64_DTPREL16_HIGHESTA: 4598 break; 4599 4600 /* Nor do these. */ 4601 case R_PPC64_TOC16: 4602 case R_PPC64_TOC16_LO: 4603 case R_PPC64_TOC16_HI: 4604 case R_PPC64_TOC16_HA: 4605 case R_PPC64_TOC16_DS: 4606 case R_PPC64_TOC16_LO_DS: 4607 sec->has_toc_reloc = 1; 4608 break; 4609 4610 /* This relocation describes the C++ object vtable hierarchy. 4611 Reconstruct it for later use during GC. */ 4612 case R_PPC64_GNU_VTINHERIT: 4613 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 4614 return FALSE; 4615 break; 4616 4617 /* This relocation describes which C++ vtable entries are actually 4618 used. Record for later use during GC. */ 4619 case R_PPC64_GNU_VTENTRY: 4620 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 4621 return FALSE; 4622 break; 4623 4624 case R_PPC64_REL14: 4625 case R_PPC64_REL14_BRTAKEN: 4626 case R_PPC64_REL14_BRNTAKEN: 4627 { 4628 asection *dest = NULL; 4629 4630 /* Heuristic: If jumping outside our section, chances are 4631 we are going to need a stub. */ 4632 if (h != NULL) 4633 { 4634 /* If the sym is weak it may be overridden later, so 4635 don't assume we know where a weak sym lives. */ 4636 if (h->root.type == bfd_link_hash_defined) 4637 dest = h->root.u.def.section; 4638 } 4639 else 4640 dest = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 4641 sec, r_symndx); 4642 if (dest != sec) 4643 ppc64_elf_section_data (sec)->has_14bit_branch = 1; 4644 } 4645 /* Fall through. */ 4646 4647 case R_PPC64_REL24: 4648 if (h != NULL) 4649 { 4650 /* We may need a .plt entry if the function this reloc 4651 refers to is in a shared lib. */ 4652 if (!update_plt_info (abfd, (struct ppc_link_hash_entry *) h, 4653 rel->r_addend)) 4654 return FALSE; 4655 if (h == &htab->tls_get_addr->elf 4656 || h == &htab->tls_get_addr_fd->elf) 4657 sec->has_tls_reloc = 1; 4658 else if (htab->tls_get_addr == NULL 4659 && CONST_STRNEQ (h->root.root.string, ".__tls_get_addr") 4660 && (h->root.root.string[15] == 0 4661 || h->root.root.string[15] == '@')) 4662 { 4663 htab->tls_get_addr = (struct ppc_link_hash_entry *) h; 4664 sec->has_tls_reloc = 1; 4665 } 4666 else if (htab->tls_get_addr_fd == NULL 4667 && CONST_STRNEQ (h->root.root.string, "__tls_get_addr") 4668 && (h->root.root.string[14] == 0 4669 || h->root.root.string[14] == '@')) 4670 { 4671 htab->tls_get_addr_fd = (struct ppc_link_hash_entry *) h; 4672 sec->has_tls_reloc = 1; 4673 } 4674 } 4675 break; 4676 4677 case R_PPC64_TPREL64: 4678 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_TPREL; 4679 if (info->shared) 4680 info->flags |= DF_STATIC_TLS; 4681 goto dotlstoc; 4682 4683 case R_PPC64_DTPMOD64: 4684 if (rel + 1 < rel_end 4685 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64) 4686 && rel[1].r_offset == rel->r_offset + 8) 4687 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_GD; 4688 else 4689 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_LD; 4690 goto dotlstoc; 4691 4692 case R_PPC64_DTPREL64: 4693 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_DTPREL; 4694 if (rel != relocs 4695 && rel[-1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPMOD64) 4696 && rel[-1].r_offset == rel->r_offset - 8) 4697 /* This is the second reloc of a dtpmod, dtprel pair. 4698 Don't mark with TLS_DTPREL. */ 4699 goto dodyn; 4700 4701 dotlstoc: 4702 sec->has_tls_reloc = 1; 4703 if (h != NULL) 4704 { 4705 struct ppc_link_hash_entry *eh; 4706 eh = (struct ppc_link_hash_entry *) h; 4707 eh->tls_mask |= tls_type; 4708 } 4709 else 4710 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx, 4711 rel->r_addend, tls_type)) 4712 return FALSE; 4713 4714 ppc64_sec = ppc64_elf_section_data (sec); 4715 if (ppc64_sec->sec_type != sec_toc) 4716 { 4717 /* One extra to simplify get_tls_mask. */ 4718 bfd_size_type amt = sec->size * sizeof (unsigned) / 8 + 1; 4719 ppc64_sec->u.t_symndx = bfd_zalloc (abfd, amt); 4720 if (ppc64_sec->u.t_symndx == NULL) 4721 return FALSE; 4722 BFD_ASSERT (ppc64_sec->sec_type == sec_normal); 4723 ppc64_sec->sec_type = sec_toc; 4724 } 4725 BFD_ASSERT (rel->r_offset % 8 == 0); 4726 ppc64_sec->u.t_symndx[rel->r_offset / 8] = r_symndx; 4727 4728 /* Mark the second slot of a GD or LD entry. 4729 -1 to indicate GD and -2 to indicate LD. */ 4730 if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_GD)) 4731 ppc64_sec->u.t_symndx[rel->r_offset / 8 + 1] = -1; 4732 else if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_LD)) 4733 ppc64_sec->u.t_symndx[rel->r_offset / 8 + 1] = -2; 4734 goto dodyn; 4735 4736 case R_PPC64_TPREL16: 4737 case R_PPC64_TPREL16_LO: 4738 case R_PPC64_TPREL16_HI: 4739 case R_PPC64_TPREL16_HA: 4740 case R_PPC64_TPREL16_DS: 4741 case R_PPC64_TPREL16_LO_DS: 4742 case R_PPC64_TPREL16_HIGHER: 4743 case R_PPC64_TPREL16_HIGHERA: 4744 case R_PPC64_TPREL16_HIGHEST: 4745 case R_PPC64_TPREL16_HIGHESTA: 4746 if (info->shared) 4747 { 4748 info->flags |= DF_STATIC_TLS; 4749 goto dodyn; 4750 } 4751 break; 4752 4753 case R_PPC64_ADDR64: 4754 if (opd_sym_map != NULL 4755 && rel + 1 < rel_end 4756 && ELF64_R_TYPE ((rel + 1)->r_info) == R_PPC64_TOC) 4757 { 4758 if (h != NULL) 4759 { 4760 if (h->root.root.string[0] == '.' 4761 && h->root.root.string[1] != 0 4762 && get_fdh ((struct ppc_link_hash_entry *) h, htab)) 4763 ; 4764 else 4765 ((struct ppc_link_hash_entry *) h)->is_func = 1; 4766 } 4767 else 4768 { 4769 asection *s; 4770 4771 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, sec, 4772 r_symndx); 4773 if (s == NULL) 4774 return FALSE; 4775 else if (s != sec) 4776 opd_sym_map[rel->r_offset / 8] = s; 4777 } 4778 } 4779 /* Fall through. */ 4780 4781 case R_PPC64_REL30: 4782 case R_PPC64_REL32: 4783 case R_PPC64_REL64: 4784 case R_PPC64_ADDR14: 4785 case R_PPC64_ADDR14_BRNTAKEN: 4786 case R_PPC64_ADDR14_BRTAKEN: 4787 case R_PPC64_ADDR16: 4788 case R_PPC64_ADDR16_DS: 4789 case R_PPC64_ADDR16_HA: 4790 case R_PPC64_ADDR16_HI: 4791 case R_PPC64_ADDR16_HIGHER: 4792 case R_PPC64_ADDR16_HIGHERA: 4793 case R_PPC64_ADDR16_HIGHEST: 4794 case R_PPC64_ADDR16_HIGHESTA: 4795 case R_PPC64_ADDR16_LO: 4796 case R_PPC64_ADDR16_LO_DS: 4797 case R_PPC64_ADDR24: 4798 case R_PPC64_ADDR32: 4799 case R_PPC64_UADDR16: 4800 case R_PPC64_UADDR32: 4801 case R_PPC64_UADDR64: 4802 case R_PPC64_TOC: 4803 if (h != NULL && !info->shared) 4804 /* We may need a copy reloc. */ 4805 h->non_got_ref = 1; 4806 4807 /* Don't propagate .opd relocs. */ 4808 if (NO_OPD_RELOCS && opd_sym_map != NULL) 4809 break; 4810 4811 /* If we are creating a shared library, and this is a reloc 4812 against a global symbol, or a non PC relative reloc 4813 against a local symbol, then we need to copy the reloc 4814 into the shared library. However, if we are linking with 4815 -Bsymbolic, we do not need to copy a reloc against a 4816 global symbol which is defined in an object we are 4817 including in the link (i.e., DEF_REGULAR is set). At 4818 this point we have not seen all the input files, so it is 4819 possible that DEF_REGULAR is not set now but will be set 4820 later (it is never cleared). In case of a weak definition, 4821 DEF_REGULAR may be cleared later by a strong definition in 4822 a shared library. We account for that possibility below by 4823 storing information in the dyn_relocs field of the hash 4824 table entry. A similar situation occurs when creating 4825 shared libraries and symbol visibility changes render the 4826 symbol local. 4827 4828 If on the other hand, we are creating an executable, we 4829 may need to keep relocations for symbols satisfied by a 4830 dynamic library if we manage to avoid copy relocs for the 4831 symbol. */ 4832 dodyn: 4833 if ((info->shared 4834 && (MUST_BE_DYN_RELOC (r_type) 4835 || (h != NULL 4836 && (! info->symbolic 4837 || h->root.type == bfd_link_hash_defweak 4838 || !h->def_regular)))) 4839 || (ELIMINATE_COPY_RELOCS 4840 && !info->shared 4841 && h != NULL 4842 && (h->root.type == bfd_link_hash_defweak 4843 || !h->def_regular))) 4844 { 4845 struct ppc_dyn_relocs *p; 4846 struct ppc_dyn_relocs **head; 4847 4848 /* We must copy these reloc types into the output file. 4849 Create a reloc section in dynobj and make room for 4850 this reloc. */ 4851 if (sreloc == NULL) 4852 { 4853 const char *name; 4854 bfd *dynobj; 4855 4856 name = (bfd_elf_string_from_elf_section 4857 (abfd, 4858 elf_elfheader (abfd)->e_shstrndx, 4859 elf_section_data (sec)->rel_hdr.sh_name)); 4860 if (name == NULL) 4861 return FALSE; 4862 4863 if (! CONST_STRNEQ (name, ".rela") 4864 || strcmp (bfd_get_section_name (abfd, sec), 4865 name + 5) != 0) 4866 { 4867 (*_bfd_error_handler) 4868 (_("%B: bad relocation section name `%s\'"), 4869 abfd, name); 4870 bfd_set_error (bfd_error_bad_value); 4871 } 4872 4873 dynobj = htab->elf.dynobj; 4874 sreloc = bfd_get_section_by_name (dynobj, name); 4875 if (sreloc == NULL) 4876 { 4877 flagword flags; 4878 4879 flags = (SEC_HAS_CONTENTS | SEC_READONLY 4880 | SEC_IN_MEMORY | SEC_LINKER_CREATED 4881 | SEC_ALLOC | SEC_LOAD); 4882 sreloc = bfd_make_section_with_flags (dynobj, 4883 name, 4884 flags); 4885 if (sreloc == NULL 4886 || ! bfd_set_section_alignment (dynobj, sreloc, 3)) 4887 return FALSE; 4888 } 4889 elf_section_data (sec)->sreloc = sreloc; 4890 } 4891 4892 /* If this is a global symbol, we count the number of 4893 relocations we need for this symbol. */ 4894 if (h != NULL) 4895 { 4896 head = &((struct ppc_link_hash_entry *) h)->dyn_relocs; 4897 } 4898 else 4899 { 4900 /* Track dynamic relocs needed for local syms too. 4901 We really need local syms available to do this 4902 easily. Oh well. */ 4903 4904 asection *s; 4905 void *vpp; 4906 4907 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 4908 sec, r_symndx); 4909 if (s == NULL) 4910 return FALSE; 4911 4912 vpp = &elf_section_data (s)->local_dynrel; 4913 head = (struct ppc_dyn_relocs **) vpp; 4914 } 4915 4916 p = *head; 4917 if (p == NULL || p->sec != sec) 4918 { 4919 p = bfd_alloc (htab->elf.dynobj, sizeof *p); 4920 if (p == NULL) 4921 return FALSE; 4922 p->next = *head; 4923 *head = p; 4924 p->sec = sec; 4925 p->count = 0; 4926 p->pc_count = 0; 4927 } 4928 4929 p->count += 1; 4930 if (!MUST_BE_DYN_RELOC (r_type)) 4931 p->pc_count += 1; 4932 } 4933 break; 4934 4935 default: 4936 break; 4937 } 4938 } 4939 4940 return TRUE; 4941} 4942 4943/* OFFSET in OPD_SEC specifies a function descriptor. Return the address 4944 of the code entry point, and its section. */ 4945 4946static bfd_vma 4947opd_entry_value (asection *opd_sec, 4948 bfd_vma offset, 4949 asection **code_sec, 4950 bfd_vma *code_off) 4951{ 4952 bfd *opd_bfd = opd_sec->owner; 4953 Elf_Internal_Rela *relocs; 4954 Elf_Internal_Rela *lo, *hi, *look; 4955 bfd_vma val; 4956 4957 /* No relocs implies we are linking a --just-symbols object. */ 4958 if (opd_sec->reloc_count == 0) 4959 { 4960 bfd_vma val; 4961 4962 if (!bfd_get_section_contents (opd_bfd, opd_sec, &val, offset, 8)) 4963 return (bfd_vma) -1; 4964 4965 if (code_sec != NULL) 4966 { 4967 asection *sec, *likely = NULL; 4968 for (sec = opd_bfd->sections; sec != NULL; sec = sec->next) 4969 if (sec->vma <= val 4970 && (sec->flags & SEC_LOAD) != 0 4971 && (sec->flags & SEC_ALLOC) != 0) 4972 likely = sec; 4973 if (likely != NULL) 4974 { 4975 *code_sec = likely; 4976 if (code_off != NULL) 4977 *code_off = val - likely->vma; 4978 } 4979 } 4980 return val; 4981 } 4982 4983 relocs = ppc64_elf_tdata (opd_bfd)->opd_relocs; 4984 if (relocs == NULL) 4985 relocs = _bfd_elf_link_read_relocs (opd_bfd, opd_sec, NULL, NULL, TRUE); 4986 4987 /* Go find the opd reloc at the sym address. */ 4988 lo = relocs; 4989 BFD_ASSERT (lo != NULL); 4990 hi = lo + opd_sec->reloc_count - 1; /* ignore last reloc */ 4991 val = (bfd_vma) -1; 4992 while (lo < hi) 4993 { 4994 look = lo + (hi - lo) / 2; 4995 if (look->r_offset < offset) 4996 lo = look + 1; 4997 else if (look->r_offset > offset) 4998 hi = look; 4999 else 5000 { 5001 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (opd_bfd)->symtab_hdr; 5002 if (ELF64_R_TYPE (look->r_info) == R_PPC64_ADDR64 5003 && ELF64_R_TYPE ((look + 1)->r_info) == R_PPC64_TOC) 5004 { 5005 unsigned long symndx = ELF64_R_SYM (look->r_info); 5006 asection *sec; 5007 5008 if (symndx < symtab_hdr->sh_info) 5009 { 5010 Elf_Internal_Sym *sym; 5011 5012 sym = (Elf_Internal_Sym *) symtab_hdr->contents; 5013 if (sym == NULL) 5014 { 5015 sym = bfd_elf_get_elf_syms (opd_bfd, symtab_hdr, 5016 symtab_hdr->sh_info, 5017 0, NULL, NULL, NULL); 5018 if (sym == NULL) 5019 break; 5020 symtab_hdr->contents = (bfd_byte *) sym; 5021 } 5022 5023 sym += symndx; 5024 val = sym->st_value; 5025 sec = NULL; 5026 if ((sym->st_shndx != SHN_UNDEF 5027 && sym->st_shndx < SHN_LORESERVE) 5028 || sym->st_shndx > SHN_HIRESERVE) 5029 sec = bfd_section_from_elf_index (opd_bfd, sym->st_shndx); 5030 BFD_ASSERT ((sec->flags & SEC_MERGE) == 0); 5031 } 5032 else 5033 { 5034 struct elf_link_hash_entry **sym_hashes; 5035 struct elf_link_hash_entry *rh; 5036 5037 sym_hashes = elf_sym_hashes (opd_bfd); 5038 rh = sym_hashes[symndx - symtab_hdr->sh_info]; 5039 while (rh->root.type == bfd_link_hash_indirect 5040 || rh->root.type == bfd_link_hash_warning) 5041 rh = ((struct elf_link_hash_entry *) rh->root.u.i.link); 5042 BFD_ASSERT (rh->root.type == bfd_link_hash_defined 5043 || rh->root.type == bfd_link_hash_defweak); 5044 val = rh->root.u.def.value; 5045 sec = rh->root.u.def.section; 5046 } 5047 val += look->r_addend; 5048 if (code_off != NULL) 5049 *code_off = val; 5050 if (code_sec != NULL) 5051 *code_sec = sec; 5052 if (sec != NULL && sec->output_section != NULL) 5053 val += sec->output_section->vma + sec->output_offset; 5054 } 5055 break; 5056 } 5057 } 5058 5059 return val; 5060} 5061 5062/* Mark sections containing dynamically referenced symbols. When 5063 building shared libraries, we must assume that any visible symbol is 5064 referenced. */ 5065 5066static bfd_boolean 5067ppc64_elf_gc_mark_dynamic_ref (struct elf_link_hash_entry *h, void *inf) 5068{ 5069 struct bfd_link_info *info = (struct bfd_link_info *) inf; 5070 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) h; 5071 5072 if (eh->elf.root.type == bfd_link_hash_warning) 5073 eh = (struct ppc_link_hash_entry *) eh->elf.root.u.i.link; 5074 5075 /* Dynamic linking info is on the func descriptor sym. */ 5076 if (eh->oh != NULL 5077 && eh->oh->is_func_descriptor 5078 && (eh->oh->elf.root.type == bfd_link_hash_defined 5079 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5080 eh = eh->oh; 5081 5082 if ((eh->elf.root.type == bfd_link_hash_defined 5083 || eh->elf.root.type == bfd_link_hash_defweak) 5084 && (eh->elf.ref_dynamic 5085 || (!info->executable 5086 && eh->elf.def_regular 5087 && ELF_ST_VISIBILITY (eh->elf.other) != STV_INTERNAL 5088 && ELF_ST_VISIBILITY (eh->elf.other) != STV_HIDDEN))) 5089 { 5090 asection *code_sec; 5091 5092 eh->elf.root.u.def.section->flags |= SEC_KEEP; 5093 5094 /* Function descriptor syms cause the associated 5095 function code sym section to be marked. */ 5096 if (eh->is_func_descriptor 5097 && (eh->oh->elf.root.type == bfd_link_hash_defined 5098 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5099 eh->oh->elf.root.u.def.section->flags |= SEC_KEEP; 5100 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5101 && opd_entry_value (eh->elf.root.u.def.section, 5102 eh->elf.root.u.def.value, 5103 &code_sec, NULL) != (bfd_vma) -1) 5104 code_sec->flags |= SEC_KEEP; 5105 } 5106 5107 return TRUE; 5108} 5109 5110/* Return the section that should be marked against GC for a given 5111 relocation. */ 5112 5113static asection * 5114ppc64_elf_gc_mark_hook (asection *sec, 5115 struct bfd_link_info *info, 5116 Elf_Internal_Rela *rel, 5117 struct elf_link_hash_entry *h, 5118 Elf_Internal_Sym *sym) 5119{ 5120 asection *rsec; 5121 5122 /* First mark all our entry sym sections. */ 5123 if (info->gc_sym_list != NULL) 5124 { 5125 struct ppc_link_hash_table *htab = ppc_hash_table (info); 5126 struct bfd_sym_chain *sym = info->gc_sym_list; 5127 5128 info->gc_sym_list = NULL; 5129 for (; sym != NULL; sym = sym->next) 5130 { 5131 struct ppc_link_hash_entry *eh; 5132 5133 eh = (struct ppc_link_hash_entry *) 5134 elf_link_hash_lookup (&htab->elf, sym->name, FALSE, FALSE, FALSE); 5135 if (eh == NULL) 5136 continue; 5137 if (eh->elf.root.type != bfd_link_hash_defined 5138 && eh->elf.root.type != bfd_link_hash_defweak) 5139 continue; 5140 5141 if (eh->is_func_descriptor 5142 && (eh->oh->elf.root.type == bfd_link_hash_defined 5143 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5144 rsec = eh->oh->elf.root.u.def.section; 5145 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5146 && opd_entry_value (eh->elf.root.u.def.section, 5147 eh->elf.root.u.def.value, 5148 &rsec, NULL) != (bfd_vma) -1) 5149 ; 5150 else 5151 continue; 5152 5153 if (!rsec->gc_mark) 5154 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook); 5155 5156 rsec = eh->elf.root.u.def.section; 5157 if (!rsec->gc_mark) 5158 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook); 5159 } 5160 } 5161 5162 /* Syms return NULL if we're marking .opd, so we avoid marking all 5163 function sections, as all functions are referenced in .opd. */ 5164 rsec = NULL; 5165 if (get_opd_info (sec) != NULL) 5166 return rsec; 5167 5168 if (h != NULL) 5169 { 5170 enum elf_ppc64_reloc_type r_type; 5171 struct ppc_link_hash_entry *eh; 5172 5173 r_type = ELF64_R_TYPE (rel->r_info); 5174 switch (r_type) 5175 { 5176 case R_PPC64_GNU_VTINHERIT: 5177 case R_PPC64_GNU_VTENTRY: 5178 break; 5179 5180 default: 5181 switch (h->root.type) 5182 { 5183 case bfd_link_hash_defined: 5184 case bfd_link_hash_defweak: 5185 eh = (struct ppc_link_hash_entry *) h; 5186 if (eh->oh != NULL 5187 && eh->oh->is_func_descriptor 5188 && (eh->oh->elf.root.type == bfd_link_hash_defined 5189 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5190 eh = eh->oh; 5191 5192 /* Function descriptor syms cause the associated 5193 function code sym section to be marked. */ 5194 if (eh->is_func_descriptor 5195 && (eh->oh->elf.root.type == bfd_link_hash_defined 5196 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5197 { 5198 /* They also mark their opd section. */ 5199 if (!eh->elf.root.u.def.section->gc_mark) 5200 _bfd_elf_gc_mark (info, eh->elf.root.u.def.section, 5201 ppc64_elf_gc_mark_hook); 5202 5203 rsec = eh->oh->elf.root.u.def.section; 5204 } 5205 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5206 && opd_entry_value (eh->elf.root.u.def.section, 5207 eh->elf.root.u.def.value, 5208 &rsec, NULL) != (bfd_vma) -1) 5209 { 5210 if (!eh->elf.root.u.def.section->gc_mark) 5211 _bfd_elf_gc_mark (info, eh->elf.root.u.def.section, 5212 ppc64_elf_gc_mark_hook); 5213 } 5214 else 5215 rsec = h->root.u.def.section; 5216 break; 5217 5218 case bfd_link_hash_common: 5219 rsec = h->root.u.c.p->section; 5220 break; 5221 5222 default: 5223 break; 5224 } 5225 } 5226 } 5227 else 5228 { 5229 asection **opd_sym_section; 5230 5231 rsec = bfd_section_from_elf_index (sec->owner, sym->st_shndx); 5232 opd_sym_section = get_opd_info (rsec); 5233 if (opd_sym_section != NULL) 5234 { 5235 if (!rsec->gc_mark) 5236 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook); 5237 5238 rsec = opd_sym_section[(sym->st_value + rel->r_addend) / 8]; 5239 } 5240 } 5241 5242 return rsec; 5243} 5244 5245/* Update the .got, .plt. and dynamic reloc reference counts for the 5246 section being removed. */ 5247 5248static bfd_boolean 5249ppc64_elf_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, 5250 asection *sec, const Elf_Internal_Rela *relocs) 5251{ 5252 struct ppc_link_hash_table *htab; 5253 Elf_Internal_Shdr *symtab_hdr; 5254 struct elf_link_hash_entry **sym_hashes; 5255 struct got_entry **local_got_ents; 5256 const Elf_Internal_Rela *rel, *relend; 5257 5258 if ((sec->flags & SEC_ALLOC) == 0) 5259 return TRUE; 5260 5261 elf_section_data (sec)->local_dynrel = NULL; 5262 5263 htab = ppc_hash_table (info); 5264 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 5265 sym_hashes = elf_sym_hashes (abfd); 5266 local_got_ents = elf_local_got_ents (abfd); 5267 5268 relend = relocs + sec->reloc_count; 5269 for (rel = relocs; rel < relend; rel++) 5270 { 5271 unsigned long r_symndx; 5272 enum elf_ppc64_reloc_type r_type; 5273 struct elf_link_hash_entry *h = NULL; 5274 char tls_type = 0; 5275 5276 r_symndx = ELF64_R_SYM (rel->r_info); 5277 r_type = ELF64_R_TYPE (rel->r_info); 5278 if (r_symndx >= symtab_hdr->sh_info) 5279 { 5280 struct ppc_link_hash_entry *eh; 5281 struct ppc_dyn_relocs **pp; 5282 struct ppc_dyn_relocs *p; 5283 5284 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 5285 while (h->root.type == bfd_link_hash_indirect 5286 || h->root.type == bfd_link_hash_warning) 5287 h = (struct elf_link_hash_entry *) h->root.u.i.link; 5288 eh = (struct ppc_link_hash_entry *) h; 5289 5290 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 5291 if (p->sec == sec) 5292 { 5293 /* Everything must go for SEC. */ 5294 *pp = p->next; 5295 break; 5296 } 5297 } 5298 5299 switch (r_type) 5300 { 5301 case R_PPC64_GOT_TLSLD16: 5302 case R_PPC64_GOT_TLSLD16_LO: 5303 case R_PPC64_GOT_TLSLD16_HI: 5304 case R_PPC64_GOT_TLSLD16_HA: 5305 ppc64_tlsld_got (abfd)->refcount -= 1; 5306 tls_type = TLS_TLS | TLS_LD; 5307 goto dogot; 5308 5309 case R_PPC64_GOT_TLSGD16: 5310 case R_PPC64_GOT_TLSGD16_LO: 5311 case R_PPC64_GOT_TLSGD16_HI: 5312 case R_PPC64_GOT_TLSGD16_HA: 5313 tls_type = TLS_TLS | TLS_GD; 5314 goto dogot; 5315 5316 case R_PPC64_GOT_TPREL16_DS: 5317 case R_PPC64_GOT_TPREL16_LO_DS: 5318 case R_PPC64_GOT_TPREL16_HI: 5319 case R_PPC64_GOT_TPREL16_HA: 5320 tls_type = TLS_TLS | TLS_TPREL; 5321 goto dogot; 5322 5323 case R_PPC64_GOT_DTPREL16_DS: 5324 case R_PPC64_GOT_DTPREL16_LO_DS: 5325 case R_PPC64_GOT_DTPREL16_HI: 5326 case R_PPC64_GOT_DTPREL16_HA: 5327 tls_type = TLS_TLS | TLS_DTPREL; 5328 goto dogot; 5329 5330 case R_PPC64_GOT16: 5331 case R_PPC64_GOT16_DS: 5332 case R_PPC64_GOT16_HA: 5333 case R_PPC64_GOT16_HI: 5334 case R_PPC64_GOT16_LO: 5335 case R_PPC64_GOT16_LO_DS: 5336 dogot: 5337 { 5338 struct got_entry *ent; 5339 5340 if (h != NULL) 5341 ent = h->got.glist; 5342 else 5343 ent = local_got_ents[r_symndx]; 5344 5345 for (; ent != NULL; ent = ent->next) 5346 if (ent->addend == rel->r_addend 5347 && ent->owner == abfd 5348 && ent->tls_type == tls_type) 5349 break; 5350 if (ent == NULL) 5351 abort (); 5352 if (ent->got.refcount > 0) 5353 ent->got.refcount -= 1; 5354 } 5355 break; 5356 5357 case R_PPC64_PLT16_HA: 5358 case R_PPC64_PLT16_HI: 5359 case R_PPC64_PLT16_LO: 5360 case R_PPC64_PLT32: 5361 case R_PPC64_PLT64: 5362 case R_PPC64_REL14: 5363 case R_PPC64_REL14_BRNTAKEN: 5364 case R_PPC64_REL14_BRTAKEN: 5365 case R_PPC64_REL24: 5366 if (h != NULL) 5367 { 5368 struct plt_entry *ent; 5369 5370 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 5371 if (ent->addend == rel->r_addend) 5372 break; 5373 if (ent == NULL) 5374 abort (); 5375 if (ent->plt.refcount > 0) 5376 ent->plt.refcount -= 1; 5377 } 5378 break; 5379 5380 default: 5381 break; 5382 } 5383 } 5384 return TRUE; 5385} 5386 5387/* The maximum size of .sfpr. */ 5388#define SFPR_MAX (218*4) 5389 5390struct sfpr_def_parms 5391{ 5392 const char name[12]; 5393 unsigned char lo, hi; 5394 bfd_byte * (*write_ent) (bfd *, bfd_byte *, int); 5395 bfd_byte * (*write_tail) (bfd *, bfd_byte *, int); 5396}; 5397 5398/* Auto-generate _save*, _rest* functions in .sfpr. */ 5399 5400static unsigned int 5401sfpr_define (struct bfd_link_info *info, const struct sfpr_def_parms *parm) 5402{ 5403 struct ppc_link_hash_table *htab = ppc_hash_table (info); 5404 unsigned int i; 5405 size_t len = strlen (parm->name); 5406 bfd_boolean writing = FALSE; 5407 char sym[16]; 5408 5409 memcpy (sym, parm->name, len); 5410 sym[len + 2] = 0; 5411 5412 for (i = parm->lo; i <= parm->hi; i++) 5413 { 5414 struct elf_link_hash_entry *h; 5415 5416 sym[len + 0] = i / 10 + '0'; 5417 sym[len + 1] = i % 10 + '0'; 5418 h = elf_link_hash_lookup (&htab->elf, sym, FALSE, FALSE, TRUE); 5419 if (h != NULL 5420 && !h->def_regular) 5421 { 5422 h->root.type = bfd_link_hash_defined; 5423 h->root.u.def.section = htab->sfpr; 5424 h->root.u.def.value = htab->sfpr->size; 5425 h->type = STT_FUNC; 5426 h->def_regular = 1; 5427 _bfd_elf_link_hash_hide_symbol (info, h, TRUE); 5428 writing = TRUE; 5429 if (htab->sfpr->contents == NULL) 5430 { 5431 htab->sfpr->contents = bfd_alloc (htab->elf.dynobj, SFPR_MAX); 5432 if (htab->sfpr->contents == NULL) 5433 return FALSE; 5434 } 5435 } 5436 if (writing) 5437 { 5438 bfd_byte *p = htab->sfpr->contents + htab->sfpr->size; 5439 if (i != parm->hi) 5440 p = (*parm->write_ent) (htab->elf.dynobj, p, i); 5441 else 5442 p = (*parm->write_tail) (htab->elf.dynobj, p, i); 5443 htab->sfpr->size = p - htab->sfpr->contents; 5444 } 5445 } 5446 5447 return TRUE; 5448} 5449 5450static bfd_byte * 5451savegpr0 (bfd *abfd, bfd_byte *p, int r) 5452{ 5453 bfd_put_32 (abfd, STD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5454 return p + 4; 5455} 5456 5457static bfd_byte * 5458savegpr0_tail (bfd *abfd, bfd_byte *p, int r) 5459{ 5460 p = savegpr0 (abfd, p, r); 5461 bfd_put_32 (abfd, STD_R0_0R1 + 16, p); 5462 p = p + 4; 5463 bfd_put_32 (abfd, BLR, p); 5464 return p + 4; 5465} 5466 5467static bfd_byte * 5468restgpr0 (bfd *abfd, bfd_byte *p, int r) 5469{ 5470 bfd_put_32 (abfd, LD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5471 return p + 4; 5472} 5473 5474static bfd_byte * 5475restgpr0_tail (bfd *abfd, bfd_byte *p, int r) 5476{ 5477 bfd_put_32 (abfd, LD_R0_0R1 + 16, p); 5478 p = p + 4; 5479 p = restgpr0 (abfd, p, r); 5480 bfd_put_32 (abfd, MTLR_R0, p); 5481 p = p + 4; 5482 if (r == 29) 5483 { 5484 p = restgpr0 (abfd, p, 30); 5485 p = restgpr0 (abfd, p, 31); 5486 } 5487 bfd_put_32 (abfd, BLR, p); 5488 return p + 4; 5489} 5490 5491static bfd_byte * 5492savegpr1 (bfd *abfd, bfd_byte *p, int r) 5493{ 5494 bfd_put_32 (abfd, STD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5495 return p + 4; 5496} 5497 5498static bfd_byte * 5499savegpr1_tail (bfd *abfd, bfd_byte *p, int r) 5500{ 5501 p = savegpr1 (abfd, p, r); 5502 bfd_put_32 (abfd, BLR, p); 5503 return p + 4; 5504} 5505 5506static bfd_byte * 5507restgpr1 (bfd *abfd, bfd_byte *p, int r) 5508{ 5509 bfd_put_32 (abfd, LD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5510 return p + 4; 5511} 5512 5513static bfd_byte * 5514restgpr1_tail (bfd *abfd, bfd_byte *p, int r) 5515{ 5516 p = restgpr1 (abfd, p, r); 5517 bfd_put_32 (abfd, BLR, p); 5518 return p + 4; 5519} 5520 5521static bfd_byte * 5522savefpr (bfd *abfd, bfd_byte *p, int r) 5523{ 5524 bfd_put_32 (abfd, STFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5525 return p + 4; 5526} 5527 5528static bfd_byte * 5529savefpr0_tail (bfd *abfd, bfd_byte *p, int r) 5530{ 5531 p = savefpr (abfd, p, r); 5532 bfd_put_32 (abfd, STD_R0_0R1 + 16, p); 5533 p = p + 4; 5534 bfd_put_32 (abfd, BLR, p); 5535 return p + 4; 5536} 5537 5538static bfd_byte * 5539restfpr (bfd *abfd, bfd_byte *p, int r) 5540{ 5541 bfd_put_32 (abfd, LFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5542 return p + 4; 5543} 5544 5545static bfd_byte * 5546restfpr0_tail (bfd *abfd, bfd_byte *p, int r) 5547{ 5548 bfd_put_32 (abfd, LD_R0_0R1 + 16, p); 5549 p = p + 4; 5550 p = restfpr (abfd, p, r); 5551 bfd_put_32 (abfd, MTLR_R0, p); 5552 p = p + 4; 5553 if (r == 29) 5554 { 5555 p = restfpr (abfd, p, 30); 5556 p = restfpr (abfd, p, 31); 5557 } 5558 bfd_put_32 (abfd, BLR, p); 5559 return p + 4; 5560} 5561 5562static bfd_byte * 5563savefpr1_tail (bfd *abfd, bfd_byte *p, int r) 5564{ 5565 p = savefpr (abfd, p, r); 5566 bfd_put_32 (abfd, BLR, p); 5567 return p + 4; 5568} 5569 5570static bfd_byte * 5571restfpr1_tail (bfd *abfd, bfd_byte *p, int r) 5572{ 5573 p = restfpr (abfd, p, r); 5574 bfd_put_32 (abfd, BLR, p); 5575 return p + 4; 5576} 5577 5578static bfd_byte * 5579savevr (bfd *abfd, bfd_byte *p, int r) 5580{ 5581 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p); 5582 p = p + 4; 5583 bfd_put_32 (abfd, STVX_VR0_R12_R0 + (r << 21), p); 5584 return p + 4; 5585} 5586 5587static bfd_byte * 5588savevr_tail (bfd *abfd, bfd_byte *p, int r) 5589{ 5590 p = savevr (abfd, p, r); 5591 bfd_put_32 (abfd, BLR, p); 5592 return p + 4; 5593} 5594 5595static bfd_byte * 5596restvr (bfd *abfd, bfd_byte *p, int r) 5597{ 5598 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p); 5599 p = p + 4; 5600 bfd_put_32 (abfd, LVX_VR0_R12_R0 + (r << 21), p); 5601 return p + 4; 5602} 5603 5604static bfd_byte * 5605restvr_tail (bfd *abfd, bfd_byte *p, int r) 5606{ 5607 p = restvr (abfd, p, r); 5608 bfd_put_32 (abfd, BLR, p); 5609 return p + 4; 5610} 5611 5612/* Called via elf_link_hash_traverse to transfer dynamic linking 5613 information on function code symbol entries to their corresponding 5614 function descriptor symbol entries. */ 5615 5616static bfd_boolean 5617func_desc_adjust (struct elf_link_hash_entry *h, void *inf) 5618{ 5619 struct bfd_link_info *info; 5620 struct ppc_link_hash_table *htab; 5621 struct plt_entry *ent; 5622 struct ppc_link_hash_entry *fh; 5623 struct ppc_link_hash_entry *fdh; 5624 bfd_boolean force_local; 5625 5626 fh = (struct ppc_link_hash_entry *) h; 5627 if (fh->elf.root.type == bfd_link_hash_indirect) 5628 return TRUE; 5629 5630 if (fh->elf.root.type == bfd_link_hash_warning) 5631 fh = (struct ppc_link_hash_entry *) fh->elf.root.u.i.link; 5632 5633 info = inf; 5634 htab = ppc_hash_table (info); 5635 5636 /* Resolve undefined references to dot-symbols as the value 5637 in the function descriptor, if we have one in a regular object. 5638 This is to satisfy cases like ".quad .foo". Calls to functions 5639 in dynamic objects are handled elsewhere. */ 5640 if (fh->elf.root.type == bfd_link_hash_undefweak 5641 && fh->was_undefined 5642 && (fh->oh->elf.root.type == bfd_link_hash_defined 5643 || fh->oh->elf.root.type == bfd_link_hash_defweak) 5644 && get_opd_info (fh->oh->elf.root.u.def.section) != NULL 5645 && opd_entry_value (fh->oh->elf.root.u.def.section, 5646 fh->oh->elf.root.u.def.value, 5647 &fh->elf.root.u.def.section, 5648 &fh->elf.root.u.def.value) != (bfd_vma) -1) 5649 { 5650 fh->elf.root.type = fh->oh->elf.root.type; 5651 fh->elf.forced_local = 1; 5652 } 5653 5654 /* If this is a function code symbol, transfer dynamic linking 5655 information to the function descriptor symbol. */ 5656 if (!fh->is_func) 5657 return TRUE; 5658 5659 for (ent = fh->elf.plt.plist; ent != NULL; ent = ent->next) 5660 if (ent->plt.refcount > 0) 5661 break; 5662 if (ent == NULL 5663 || fh->elf.root.root.string[0] != '.' 5664 || fh->elf.root.root.string[1] == '\0') 5665 return TRUE; 5666 5667 /* Find the corresponding function descriptor symbol. Create it 5668 as undefined if necessary. */ 5669 5670 fdh = get_fdh (fh, htab); 5671 if (fdh != NULL) 5672 while (fdh->elf.root.type == bfd_link_hash_indirect 5673 || fdh->elf.root.type == bfd_link_hash_warning) 5674 fdh = (struct ppc_link_hash_entry *) fdh->elf.root.u.i.link; 5675 5676 if (fdh == NULL 5677 && info->shared 5678 && (fh->elf.root.type == bfd_link_hash_undefined 5679 || fh->elf.root.type == bfd_link_hash_undefweak)) 5680 { 5681 fdh = make_fdh (info, fh); 5682 if (fdh == NULL) 5683 return FALSE; 5684 } 5685 5686 /* Fake function descriptors are made undefweak. If the function 5687 code symbol is strong undefined, make the fake sym the same. 5688 If the function code symbol is defined, then force the fake 5689 descriptor local; We can't support overriding of symbols in a 5690 shared library on a fake descriptor. */ 5691 5692 if (fdh != NULL 5693 && fdh->fake 5694 && fdh->elf.root.type == bfd_link_hash_undefweak) 5695 { 5696 if (fh->elf.root.type == bfd_link_hash_undefined) 5697 { 5698 fdh->elf.root.type = bfd_link_hash_undefined; 5699 bfd_link_add_undef (&htab->elf.root, &fdh->elf.root); 5700 } 5701 else if (fh->elf.root.type == bfd_link_hash_defined 5702 || fh->elf.root.type == bfd_link_hash_defweak) 5703 { 5704 _bfd_elf_link_hash_hide_symbol (info, &fdh->elf, TRUE); 5705 } 5706 } 5707 5708 if (fdh != NULL 5709 && !fdh->elf.forced_local 5710 && (info->shared 5711 || fdh->elf.def_dynamic 5712 || fdh->elf.ref_dynamic 5713 || (fdh->elf.root.type == bfd_link_hash_undefweak 5714 && ELF_ST_VISIBILITY (fdh->elf.other) == STV_DEFAULT))) 5715 { 5716 if (fdh->elf.dynindx == -1) 5717 if (! bfd_elf_link_record_dynamic_symbol (info, &fdh->elf)) 5718 return FALSE; 5719 fdh->elf.ref_regular |= fh->elf.ref_regular; 5720 fdh->elf.ref_dynamic |= fh->elf.ref_dynamic; 5721 fdh->elf.ref_regular_nonweak |= fh->elf.ref_regular_nonweak; 5722 fdh->elf.non_got_ref |= fh->elf.non_got_ref; 5723 if (ELF_ST_VISIBILITY (fh->elf.other) == STV_DEFAULT) 5724 { 5725 move_plt_plist (fh, fdh); 5726 fdh->elf.needs_plt = 1; 5727 } 5728 fdh->is_func_descriptor = 1; 5729 fdh->oh = fh; 5730 fh->oh = fdh; 5731 } 5732 5733 /* Now that the info is on the function descriptor, clear the 5734 function code sym info. Any function code syms for which we 5735 don't have a definition in a regular file, we force local. 5736 This prevents a shared library from exporting syms that have 5737 been imported from another library. Function code syms that 5738 are really in the library we must leave global to prevent the 5739 linker dragging in a definition from a static library. */ 5740 force_local = (!fh->elf.def_regular 5741 || fdh == NULL 5742 || !fdh->elf.def_regular 5743 || fdh->elf.forced_local); 5744 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local); 5745 5746 return TRUE; 5747} 5748 5749/* Called near the start of bfd_elf_size_dynamic_sections. We use 5750 this hook to a) provide some gcc support functions, and b) transfer 5751 dynamic linking information gathered so far on function code symbol 5752 entries, to their corresponding function descriptor symbol entries. */ 5753 5754static bfd_boolean 5755ppc64_elf_func_desc_adjust (bfd *obfd ATTRIBUTE_UNUSED, 5756 struct bfd_link_info *info) 5757{ 5758 struct ppc_link_hash_table *htab; 5759 unsigned int i; 5760 const struct sfpr_def_parms funcs[] = 5761 { 5762 { "_savegpr0_", 14, 31, savegpr0, savegpr0_tail }, 5763 { "_restgpr0_", 14, 29, restgpr0, restgpr0_tail }, 5764 { "_restgpr0_", 30, 31, restgpr0, restgpr0_tail }, 5765 { "_savegpr1_", 14, 31, savegpr1, savegpr1_tail }, 5766 { "_restgpr1_", 14, 31, restgpr1, restgpr1_tail }, 5767 { "_savefpr_", 14, 31, savefpr, savefpr0_tail }, 5768 { "_restfpr_", 14, 29, restfpr, restfpr0_tail }, 5769 { "_restfpr_", 30, 31, restfpr, restfpr0_tail }, 5770 { "._savef", 14, 31, savefpr, savefpr1_tail }, 5771 { "._restf", 14, 31, restfpr, restfpr1_tail }, 5772 { "_savevr_", 20, 31, savevr, savevr_tail }, 5773 { "_restvr_", 20, 31, restvr, restvr_tail } 5774 }; 5775 5776 htab = ppc_hash_table (info); 5777 if (htab->sfpr == NULL) 5778 /* We don't have any relocs. */ 5779 return TRUE; 5780 5781 /* Provide any missing _save* and _rest* functions. */ 5782 htab->sfpr->size = 0; 5783 for (i = 0; i < sizeof (funcs) / sizeof (funcs[0]); i++) 5784 if (!sfpr_define (info, &funcs[i])) 5785 return FALSE; 5786 5787 elf_link_hash_traverse (&htab->elf, func_desc_adjust, info); 5788 5789 if (htab->sfpr->size == 0) 5790 htab->sfpr->flags |= SEC_EXCLUDE; 5791 5792 return TRUE; 5793} 5794 5795/* Adjust a symbol defined by a dynamic object and referenced by a 5796 regular object. The current definition is in some section of the 5797 dynamic object, but we're not including those sections. We have to 5798 change the definition to something the rest of the link can 5799 understand. */ 5800 5801static bfd_boolean 5802ppc64_elf_adjust_dynamic_symbol (struct bfd_link_info *info, 5803 struct elf_link_hash_entry *h) 5804{ 5805 struct ppc_link_hash_table *htab; 5806 asection *s; 5807 unsigned int power_of_two; 5808 5809 htab = ppc_hash_table (info); 5810 5811 /* Deal with function syms. */ 5812 if (h->type == STT_FUNC 5813 || h->needs_plt) 5814 { 5815 /* Clear procedure linkage table information for any symbol that 5816 won't need a .plt entry. */ 5817 struct plt_entry *ent; 5818 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 5819 if (ent->plt.refcount > 0) 5820 break; 5821 if (ent == NULL 5822 || SYMBOL_CALLS_LOCAL (info, h) 5823 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 5824 && h->root.type == bfd_link_hash_undefweak)) 5825 { 5826 h->plt.plist = NULL; 5827 h->needs_plt = 0; 5828 } 5829 } 5830 else 5831 h->plt.plist = NULL; 5832 5833 /* If this is a weak symbol, and there is a real definition, the 5834 processor independent code will have arranged for us to see the 5835 real definition first, and we can just use the same value. */ 5836 if (h->u.weakdef != NULL) 5837 { 5838 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 5839 || h->u.weakdef->root.type == bfd_link_hash_defweak); 5840 h->root.u.def.section = h->u.weakdef->root.u.def.section; 5841 h->root.u.def.value = h->u.weakdef->root.u.def.value; 5842 if (ELIMINATE_COPY_RELOCS) 5843 h->non_got_ref = h->u.weakdef->non_got_ref; 5844 return TRUE; 5845 } 5846 5847 /* If we are creating a shared library, we must presume that the 5848 only references to the symbol are via the global offset table. 5849 For such cases we need not do anything here; the relocations will 5850 be handled correctly by relocate_section. */ 5851 if (info->shared) 5852 return TRUE; 5853 5854 /* If there are no references to this symbol that do not use the 5855 GOT, we don't need to generate a copy reloc. */ 5856 if (!h->non_got_ref) 5857 return TRUE; 5858 5859 if (ELIMINATE_COPY_RELOCS) 5860 { 5861 struct ppc_link_hash_entry * eh; 5862 struct ppc_dyn_relocs *p; 5863 5864 eh = (struct ppc_link_hash_entry *) h; 5865 for (p = eh->dyn_relocs; p != NULL; p = p->next) 5866 { 5867 s = p->sec->output_section; 5868 if (s != NULL && (s->flags & SEC_READONLY) != 0) 5869 break; 5870 } 5871 5872 /* If we didn't find any dynamic relocs in read-only sections, then 5873 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 5874 if (p == NULL) 5875 { 5876 h->non_got_ref = 0; 5877 return TRUE; 5878 } 5879 } 5880 5881 if (h->plt.plist != NULL) 5882 { 5883 /* We should never get here, but unfortunately there are versions 5884 of gcc out there that improperly (for this ABI) put initialized 5885 function pointers, vtable refs and suchlike in read-only 5886 sections. Allow them to proceed, but warn that this might 5887 break at runtime. */ 5888 (*_bfd_error_handler) 5889 (_("copy reloc against `%s' requires lazy plt linking; " 5890 "avoid setting LD_BIND_NOW=1 or upgrade gcc"), 5891 h->root.root.string); 5892 } 5893 5894 /* This is a reference to a symbol defined by a dynamic object which 5895 is not a function. */ 5896 5897 if (h->size == 0) 5898 { 5899 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 5900 h->root.root.string); 5901 return TRUE; 5902 } 5903 5904 /* We must allocate the symbol in our .dynbss section, which will 5905 become part of the .bss section of the executable. There will be 5906 an entry for this symbol in the .dynsym section. The dynamic 5907 object will contain position independent code, so all references 5908 from the dynamic object to this symbol will go through the global 5909 offset table. The dynamic linker will use the .dynsym entry to 5910 determine the address it must put in the global offset table, so 5911 both the dynamic object and the regular object will refer to the 5912 same memory location for the variable. */ 5913 5914 /* We must generate a R_PPC64_COPY reloc to tell the dynamic linker 5915 to copy the initial value out of the dynamic object and into the 5916 runtime process image. We need to remember the offset into the 5917 .rela.bss section we are going to use. */ 5918 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 5919 { 5920 htab->relbss->size += sizeof (Elf64_External_Rela); 5921 h->needs_copy = 1; 5922 } 5923 5924 /* We need to figure out the alignment required for this symbol. I 5925 have no idea how ELF linkers handle this. */ 5926 power_of_two = bfd_log2 (h->size); 5927 if (power_of_two > 4) 5928 power_of_two = 4; 5929 5930 /* Apply the required alignment. */ 5931 s = htab->dynbss; 5932 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 5933 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) 5934 { 5935 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) 5936 return FALSE; 5937 } 5938 5939 /* Define the symbol as being at this point in the section. */ 5940 h->root.u.def.section = s; 5941 h->root.u.def.value = s->size; 5942 5943 /* Increment the section size to make room for the symbol. */ 5944 s->size += h->size; 5945 5946 return TRUE; 5947} 5948 5949/* If given a function descriptor symbol, hide both the function code 5950 sym and the descriptor. */ 5951static void 5952ppc64_elf_hide_symbol (struct bfd_link_info *info, 5953 struct elf_link_hash_entry *h, 5954 bfd_boolean force_local) 5955{ 5956 struct ppc_link_hash_entry *eh; 5957 _bfd_elf_link_hash_hide_symbol (info, h, force_local); 5958 5959 eh = (struct ppc_link_hash_entry *) h; 5960 if (eh->is_func_descriptor) 5961 { 5962 struct ppc_link_hash_entry *fh = eh->oh; 5963 5964 if (fh == NULL) 5965 { 5966 const char *p, *q; 5967 struct ppc_link_hash_table *htab; 5968 char save; 5969 5970 /* We aren't supposed to use alloca in BFD because on 5971 systems which do not have alloca the version in libiberty 5972 calls xmalloc, which might cause the program to crash 5973 when it runs out of memory. This function doesn't have a 5974 return status, so there's no way to gracefully return an 5975 error. So cheat. We know that string[-1] can be safely 5976 accessed; It's either a string in an ELF string table, 5977 or allocated in an objalloc structure. */ 5978 5979 p = eh->elf.root.root.string - 1; 5980 save = *p; 5981 *(char *) p = '.'; 5982 htab = ppc_hash_table (info); 5983 fh = (struct ppc_link_hash_entry *) 5984 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE); 5985 *(char *) p = save; 5986 5987 /* Unfortunately, if it so happens that the string we were 5988 looking for was allocated immediately before this string, 5989 then we overwrote the string terminator. That's the only 5990 reason the lookup should fail. */ 5991 if (fh == NULL) 5992 { 5993 q = eh->elf.root.root.string + strlen (eh->elf.root.root.string); 5994 while (q >= eh->elf.root.root.string && *q == *p) 5995 --q, --p; 5996 if (q < eh->elf.root.root.string && *p == '.') 5997 fh = (struct ppc_link_hash_entry *) 5998 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE); 5999 } 6000 if (fh != NULL) 6001 { 6002 eh->oh = fh; 6003 fh->oh = eh; 6004 } 6005 } 6006 if (fh != NULL) 6007 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local); 6008 } 6009} 6010 6011static bfd_boolean 6012get_sym_h (struct elf_link_hash_entry **hp, 6013 Elf_Internal_Sym **symp, 6014 asection **symsecp, 6015 char **tls_maskp, 6016 Elf_Internal_Sym **locsymsp, 6017 unsigned long r_symndx, 6018 bfd *ibfd) 6019{ 6020 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 6021 6022 if (r_symndx >= symtab_hdr->sh_info) 6023 { 6024 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd); 6025 struct elf_link_hash_entry *h; 6026 6027 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 6028 while (h->root.type == bfd_link_hash_indirect 6029 || h->root.type == bfd_link_hash_warning) 6030 h = (struct elf_link_hash_entry *) h->root.u.i.link; 6031 6032 if (hp != NULL) 6033 *hp = h; 6034 6035 if (symp != NULL) 6036 *symp = NULL; 6037 6038 if (symsecp != NULL) 6039 { 6040 asection *symsec = NULL; 6041 if (h->root.type == bfd_link_hash_defined 6042 || h->root.type == bfd_link_hash_defweak) 6043 symsec = h->root.u.def.section; 6044 *symsecp = symsec; 6045 } 6046 6047 if (tls_maskp != NULL) 6048 { 6049 struct ppc_link_hash_entry *eh; 6050 6051 eh = (struct ppc_link_hash_entry *) h; 6052 *tls_maskp = &eh->tls_mask; 6053 } 6054 } 6055 else 6056 { 6057 Elf_Internal_Sym *sym; 6058 Elf_Internal_Sym *locsyms = *locsymsp; 6059 6060 if (locsyms == NULL) 6061 { 6062 locsyms = (Elf_Internal_Sym *) symtab_hdr->contents; 6063 if (locsyms == NULL) 6064 locsyms = bfd_elf_get_elf_syms (ibfd, symtab_hdr, 6065 symtab_hdr->sh_info, 6066 0, NULL, NULL, NULL); 6067 if (locsyms == NULL) 6068 return FALSE; 6069 *locsymsp = locsyms; 6070 } 6071 sym = locsyms + r_symndx; 6072 6073 if (hp != NULL) 6074 *hp = NULL; 6075 6076 if (symp != NULL) 6077 *symp = sym; 6078 6079 if (symsecp != NULL) 6080 { 6081 asection *symsec = NULL; 6082 if ((sym->st_shndx != SHN_UNDEF 6083 && sym->st_shndx < SHN_LORESERVE) 6084 || sym->st_shndx > SHN_HIRESERVE) 6085 symsec = bfd_section_from_elf_index (ibfd, sym->st_shndx); 6086 *symsecp = symsec; 6087 } 6088 6089 if (tls_maskp != NULL) 6090 { 6091 struct got_entry **lgot_ents; 6092 char *tls_mask; 6093 6094 tls_mask = NULL; 6095 lgot_ents = elf_local_got_ents (ibfd); 6096 if (lgot_ents != NULL) 6097 { 6098 char *lgot_masks = (char *) (lgot_ents + symtab_hdr->sh_info); 6099 tls_mask = &lgot_masks[r_symndx]; 6100 } 6101 *tls_maskp = tls_mask; 6102 } 6103 } 6104 return TRUE; 6105} 6106 6107/* Returns TLS_MASKP for the given REL symbol. Function return is 0 on 6108 error, 2 on a toc GD type suitable for optimization, 3 on a toc LD 6109 type suitable for optimization, and 1 otherwise. */ 6110 6111static int 6112get_tls_mask (char **tls_maskp, unsigned long *toc_symndx, 6113 Elf_Internal_Sym **locsymsp, 6114 const Elf_Internal_Rela *rel, bfd *ibfd) 6115{ 6116 unsigned long r_symndx; 6117 int next_r; 6118 struct elf_link_hash_entry *h; 6119 Elf_Internal_Sym *sym; 6120 asection *sec; 6121 bfd_vma off; 6122 6123 r_symndx = ELF64_R_SYM (rel->r_info); 6124 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd)) 6125 return 0; 6126 6127 if ((*tls_maskp != NULL && **tls_maskp != 0) 6128 || sec == NULL 6129 || ppc64_elf_section_data (sec)->sec_type != sec_toc) 6130 return 1; 6131 6132 /* Look inside a TOC section too. */ 6133 if (h != NULL) 6134 { 6135 BFD_ASSERT (h->root.type == bfd_link_hash_defined); 6136 off = h->root.u.def.value; 6137 } 6138 else 6139 off = sym->st_value; 6140 off += rel->r_addend; 6141 BFD_ASSERT (off % 8 == 0); 6142 r_symndx = ppc64_elf_section_data (sec)->u.t_symndx[off / 8]; 6143 next_r = ppc64_elf_section_data (sec)->u.t_symndx[off / 8 + 1]; 6144 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd)) 6145 return 0; 6146 if (toc_symndx != NULL) 6147 *toc_symndx = r_symndx; 6148 if ((h == NULL 6149 || ((h->root.type == bfd_link_hash_defined 6150 || h->root.type == bfd_link_hash_defweak) 6151 && !h->def_dynamic)) 6152 && (next_r == -1 || next_r == -2)) 6153 return 1 - next_r; 6154 return 1; 6155} 6156 6157/* Adjust all global syms defined in opd sections. In gcc generated 6158 code for the old ABI, these will already have been done. */ 6159 6160static bfd_boolean 6161adjust_opd_syms (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED) 6162{ 6163 struct ppc_link_hash_entry *eh; 6164 asection *sym_sec; 6165 long *opd_adjust; 6166 6167 if (h->root.type == bfd_link_hash_indirect) 6168 return TRUE; 6169 6170 if (h->root.type == bfd_link_hash_warning) 6171 h = (struct elf_link_hash_entry *) h->root.u.i.link; 6172 6173 if (h->root.type != bfd_link_hash_defined 6174 && h->root.type != bfd_link_hash_defweak) 6175 return TRUE; 6176 6177 eh = (struct ppc_link_hash_entry *) h; 6178 if (eh->adjust_done) 6179 return TRUE; 6180 6181 sym_sec = eh->elf.root.u.def.section; 6182 opd_adjust = get_opd_info (sym_sec); 6183 if (opd_adjust != NULL) 6184 { 6185 long adjust = opd_adjust[eh->elf.root.u.def.value / 8]; 6186 if (adjust == -1) 6187 { 6188 /* This entry has been deleted. */ 6189 asection *dsec = ppc64_elf_tdata (sym_sec->owner)->deleted_section; 6190 if (dsec == NULL) 6191 { 6192 for (dsec = sym_sec->owner->sections; dsec; dsec = dsec->next) 6193 if (elf_discarded_section (dsec)) 6194 { 6195 ppc64_elf_tdata (sym_sec->owner)->deleted_section = dsec; 6196 break; 6197 } 6198 } 6199 eh->elf.root.u.def.value = 0; 6200 eh->elf.root.u.def.section = dsec; 6201 } 6202 else 6203 eh->elf.root.u.def.value += adjust; 6204 eh->adjust_done = 1; 6205 } 6206 return TRUE; 6207} 6208 6209/* Handles decrementing dynamic reloc counts for the reloc specified by 6210 R_INFO in section SEC. If LOCAL_SYMS is NULL, then H and SYM_SEC 6211 have already been determined. */ 6212 6213static bfd_boolean 6214dec_dynrel_count (bfd_vma r_info, 6215 asection *sec, 6216 struct bfd_link_info *info, 6217 Elf_Internal_Sym **local_syms, 6218 struct elf_link_hash_entry *h, 6219 asection *sym_sec) 6220{ 6221 enum elf_ppc64_reloc_type r_type; 6222 struct ppc_dyn_relocs *p; 6223 struct ppc_dyn_relocs **pp; 6224 6225 /* Can this reloc be dynamic? This switch, and later tests here 6226 should be kept in sync with the code in check_relocs. */ 6227 r_type = ELF64_R_TYPE (r_info); 6228 switch (r_type) 6229 { 6230 default: 6231 return TRUE; 6232 6233 case R_PPC64_TPREL16: 6234 case R_PPC64_TPREL16_LO: 6235 case R_PPC64_TPREL16_HI: 6236 case R_PPC64_TPREL16_HA: 6237 case R_PPC64_TPREL16_DS: 6238 case R_PPC64_TPREL16_LO_DS: 6239 case R_PPC64_TPREL16_HIGHER: 6240 case R_PPC64_TPREL16_HIGHERA: 6241 case R_PPC64_TPREL16_HIGHEST: 6242 case R_PPC64_TPREL16_HIGHESTA: 6243 if (!info->shared) 6244 return TRUE; 6245 6246 case R_PPC64_TPREL64: 6247 case R_PPC64_DTPMOD64: 6248 case R_PPC64_DTPREL64: 6249 case R_PPC64_ADDR64: 6250 case R_PPC64_REL30: 6251 case R_PPC64_REL32: 6252 case R_PPC64_REL64: 6253 case R_PPC64_ADDR14: 6254 case R_PPC64_ADDR14_BRNTAKEN: 6255 case R_PPC64_ADDR14_BRTAKEN: 6256 case R_PPC64_ADDR16: 6257 case R_PPC64_ADDR16_DS: 6258 case R_PPC64_ADDR16_HA: 6259 case R_PPC64_ADDR16_HI: 6260 case R_PPC64_ADDR16_HIGHER: 6261 case R_PPC64_ADDR16_HIGHERA: 6262 case R_PPC64_ADDR16_HIGHEST: 6263 case R_PPC64_ADDR16_HIGHESTA: 6264 case R_PPC64_ADDR16_LO: 6265 case R_PPC64_ADDR16_LO_DS: 6266 case R_PPC64_ADDR24: 6267 case R_PPC64_ADDR32: 6268 case R_PPC64_UADDR16: 6269 case R_PPC64_UADDR32: 6270 case R_PPC64_UADDR64: 6271 case R_PPC64_TOC: 6272 break; 6273 } 6274 6275 if (local_syms != NULL) 6276 { 6277 unsigned long r_symndx; 6278 Elf_Internal_Sym *sym; 6279 bfd *ibfd = sec->owner; 6280 6281 r_symndx = ELF64_R_SYM (r_info); 6282 if (!get_sym_h (&h, &sym, &sym_sec, NULL, local_syms, r_symndx, ibfd)) 6283 return FALSE; 6284 } 6285 6286 if ((info->shared 6287 && (MUST_BE_DYN_RELOC (r_type) 6288 || (h != NULL 6289 && (!info->symbolic 6290 || h->root.type == bfd_link_hash_defweak 6291 || !h->def_regular)))) 6292 || (ELIMINATE_COPY_RELOCS 6293 && !info->shared 6294 && h != NULL 6295 && (h->root.type == bfd_link_hash_defweak 6296 || !h->def_regular))) 6297 ; 6298 else 6299 return TRUE; 6300 6301 if (h != NULL) 6302 pp = &((struct ppc_link_hash_entry *) h)->dyn_relocs; 6303 else 6304 { 6305 if (sym_sec != NULL) 6306 { 6307 void *vpp = &elf_section_data (sym_sec)->local_dynrel; 6308 pp = (struct ppc_dyn_relocs **) vpp; 6309 } 6310 else 6311 { 6312 void *vpp = &elf_section_data (sec)->local_dynrel; 6313 pp = (struct ppc_dyn_relocs **) vpp; 6314 } 6315 6316 /* elf_gc_sweep may have already removed all dyn relocs associated 6317 with local syms for a given section. Don't report a dynreloc 6318 miscount. */ 6319 if (*pp == NULL) 6320 return TRUE; 6321 } 6322 6323 while ((p = *pp) != NULL) 6324 { 6325 if (p->sec == sec) 6326 { 6327 if (!MUST_BE_DYN_RELOC (r_type)) 6328 p->pc_count -= 1; 6329 p->count -= 1; 6330 if (p->count == 0) 6331 *pp = p->next; 6332 return TRUE; 6333 } 6334 pp = &p->next; 6335 } 6336 6337 (*_bfd_error_handler) (_("dynreloc miscount for %B, section %A"), 6338 sec->owner, sec); 6339 bfd_set_error (bfd_error_bad_value); 6340 return FALSE; 6341} 6342 6343/* Remove unused Official Procedure Descriptor entries. Currently we 6344 only remove those associated with functions in discarded link-once 6345 sections, or weakly defined functions that have been overridden. It 6346 would be possible to remove many more entries for statically linked 6347 applications. */ 6348 6349bfd_boolean 6350ppc64_elf_edit_opd (bfd *obfd, struct bfd_link_info *info, 6351 bfd_boolean no_opd_opt, 6352 bfd_boolean non_overlapping) 6353{ 6354 bfd *ibfd; 6355 bfd_boolean some_edited = FALSE; 6356 asection *need_pad = NULL; 6357 6358 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 6359 { 6360 asection *sec; 6361 Elf_Internal_Rela *relstart, *rel, *relend; 6362 Elf_Internal_Shdr *symtab_hdr; 6363 Elf_Internal_Sym *local_syms; 6364 struct elf_link_hash_entry **sym_hashes; 6365 bfd_vma offset; 6366 bfd_size_type amt; 6367 long *opd_adjust; 6368 bfd_boolean need_edit, add_aux_fields; 6369 bfd_size_type cnt_16b = 0; 6370 6371 sec = bfd_get_section_by_name (ibfd, ".opd"); 6372 if (sec == NULL || sec->size == 0) 6373 continue; 6374 6375 amt = sec->size * sizeof (long) / 8; 6376 opd_adjust = get_opd_info (sec); 6377 if (opd_adjust == NULL) 6378 { 6379 /* check_relocs hasn't been called. Must be a ld -r link 6380 or --just-symbols object. */ 6381 opd_adjust = bfd_alloc (obfd, amt); 6382 if (opd_adjust == NULL) 6383 return FALSE; 6384 ppc64_elf_section_data (sec)->u.opd_adjust = opd_adjust; 6385 BFD_ASSERT (ppc64_elf_section_data (sec)->sec_type == sec_normal); 6386 ppc64_elf_section_data (sec)->sec_type = sec_opd; 6387 } 6388 memset (opd_adjust, 0, amt); 6389 6390 if (no_opd_opt) 6391 continue; 6392 6393 if (sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS) 6394 continue; 6395 6396 if (sec->output_section == bfd_abs_section_ptr) 6397 continue; 6398 6399 /* Look through the section relocs. */ 6400 if ((sec->flags & SEC_RELOC) == 0 || sec->reloc_count == 0) 6401 continue; 6402 6403 local_syms = NULL; 6404 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 6405 sym_hashes = elf_sym_hashes (ibfd); 6406 6407 /* Read the relocations. */ 6408 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 6409 info->keep_memory); 6410 if (relstart == NULL) 6411 return FALSE; 6412 6413 /* First run through the relocs to check they are sane, and to 6414 determine whether we need to edit this opd section. */ 6415 need_edit = FALSE; 6416 need_pad = sec; 6417 offset = 0; 6418 relend = relstart + sec->reloc_count; 6419 for (rel = relstart; rel < relend; ) 6420 { 6421 enum elf_ppc64_reloc_type r_type; 6422 unsigned long r_symndx; 6423 asection *sym_sec; 6424 struct elf_link_hash_entry *h; 6425 Elf_Internal_Sym *sym; 6426 6427 /* .opd contains a regular array of 16 or 24 byte entries. We're 6428 only interested in the reloc pointing to a function entry 6429 point. */ 6430 if (rel->r_offset != offset 6431 || rel + 1 >= relend 6432 || (rel + 1)->r_offset != offset + 8) 6433 { 6434 /* If someone messes with .opd alignment then after a 6435 "ld -r" we might have padding in the middle of .opd. 6436 Also, there's nothing to prevent someone putting 6437 something silly in .opd with the assembler. No .opd 6438 optimization for them! */ 6439 broken_opd: 6440 (*_bfd_error_handler) 6441 (_("%B: .opd is not a regular array of opd entries"), ibfd); 6442 need_edit = FALSE; 6443 break; 6444 } 6445 6446 if ((r_type = ELF64_R_TYPE (rel->r_info)) != R_PPC64_ADDR64 6447 || (r_type = ELF64_R_TYPE ((rel + 1)->r_info)) != R_PPC64_TOC) 6448 { 6449 (*_bfd_error_handler) 6450 (_("%B: unexpected reloc type %u in .opd section"), 6451 ibfd, r_type); 6452 need_edit = FALSE; 6453 break; 6454 } 6455 6456 r_symndx = ELF64_R_SYM (rel->r_info); 6457 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 6458 r_symndx, ibfd)) 6459 goto error_ret; 6460 6461 if (sym_sec == NULL || sym_sec->owner == NULL) 6462 { 6463 const char *sym_name; 6464 if (h != NULL) 6465 sym_name = h->root.root.string; 6466 else 6467 sym_name = bfd_elf_sym_name (ibfd, symtab_hdr, sym, 6468 sym_sec); 6469 6470 (*_bfd_error_handler) 6471 (_("%B: undefined sym `%s' in .opd section"), 6472 ibfd, sym_name); 6473 need_edit = FALSE; 6474 break; 6475 } 6476 6477 /* opd entries are always for functions defined in the 6478 current input bfd. If the symbol isn't defined in the 6479 input bfd, then we won't be using the function in this 6480 bfd; It must be defined in a linkonce section in another 6481 bfd, or is weak. It's also possible that we are 6482 discarding the function due to a linker script /DISCARD/, 6483 which we test for via the output_section. */ 6484 if (sym_sec->owner != ibfd 6485 || sym_sec->output_section == bfd_abs_section_ptr) 6486 need_edit = TRUE; 6487 6488 rel += 2; 6489 if (rel == relend 6490 || (rel + 1 == relend && rel->r_offset == offset + 16)) 6491 { 6492 if (sec->size == offset + 24) 6493 { 6494 need_pad = NULL; 6495 break; 6496 } 6497 if (rel == relend && sec->size == offset + 16) 6498 { 6499 cnt_16b++; 6500 break; 6501 } 6502 goto broken_opd; 6503 } 6504 6505 if (rel->r_offset == offset + 24) 6506 offset += 24; 6507 else if (rel->r_offset != offset + 16) 6508 goto broken_opd; 6509 else if (rel + 1 < relend 6510 && ELF64_R_TYPE (rel[0].r_info) == R_PPC64_ADDR64 6511 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_TOC) 6512 { 6513 offset += 16; 6514 cnt_16b++; 6515 } 6516 else if (rel + 2 < relend 6517 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_ADDR64 6518 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_TOC) 6519 { 6520 offset += 24; 6521 rel += 1; 6522 } 6523 else 6524 goto broken_opd; 6525 } 6526 6527 add_aux_fields = non_overlapping && cnt_16b > 0; 6528 6529 if (need_edit || add_aux_fields) 6530 { 6531 Elf_Internal_Rela *write_rel; 6532 bfd_byte *rptr, *wptr; 6533 bfd_byte *new_contents = NULL; 6534 bfd_boolean skip; 6535 long opd_ent_size; 6536 6537 /* This seems a waste of time as input .opd sections are all 6538 zeros as generated by gcc, but I suppose there's no reason 6539 this will always be so. We might start putting something in 6540 the third word of .opd entries. */ 6541 if ((sec->flags & SEC_IN_MEMORY) == 0) 6542 { 6543 bfd_byte *loc; 6544 if (!bfd_malloc_and_get_section (ibfd, sec, &loc)) 6545 { 6546 if (loc != NULL) 6547 free (loc); 6548 error_ret: 6549 if (local_syms != NULL 6550 && symtab_hdr->contents != (unsigned char *) local_syms) 6551 free (local_syms); 6552 if (elf_section_data (sec)->relocs != relstart) 6553 free (relstart); 6554 return FALSE; 6555 } 6556 sec->contents = loc; 6557 sec->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS); 6558 } 6559 6560 elf_section_data (sec)->relocs = relstart; 6561 6562 new_contents = sec->contents; 6563 if (add_aux_fields) 6564 { 6565 new_contents = bfd_malloc (sec->size + cnt_16b * 8); 6566 if (new_contents == NULL) 6567 return FALSE; 6568 need_pad = FALSE; 6569 } 6570 wptr = new_contents; 6571 rptr = sec->contents; 6572 6573 write_rel = relstart; 6574 skip = FALSE; 6575 offset = 0; 6576 opd_ent_size = 0; 6577 for (rel = relstart; rel < relend; rel++) 6578 { 6579 unsigned long r_symndx; 6580 asection *sym_sec; 6581 struct elf_link_hash_entry *h; 6582 Elf_Internal_Sym *sym; 6583 6584 r_symndx = ELF64_R_SYM (rel->r_info); 6585 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 6586 r_symndx, ibfd)) 6587 goto error_ret; 6588 6589 if (rel->r_offset == offset) 6590 { 6591 struct ppc_link_hash_entry *fdh = NULL; 6592 6593 /* See if the .opd entry is full 24 byte or 6594 16 byte (with fd_aux entry overlapped with next 6595 fd_func). */ 6596 opd_ent_size = 24; 6597 if ((rel + 2 == relend && sec->size == offset + 16) 6598 || (rel + 3 < relend 6599 && rel[2].r_offset == offset + 16 6600 && rel[3].r_offset == offset + 24 6601 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_ADDR64 6602 && ELF64_R_TYPE (rel[3].r_info) == R_PPC64_TOC)) 6603 opd_ent_size = 16; 6604 6605 if (h != NULL 6606 && h->root.root.string[0] == '.') 6607 { 6608 fdh = get_fdh ((struct ppc_link_hash_entry *) h, 6609 ppc_hash_table (info)); 6610 if (fdh != NULL 6611 && fdh->elf.root.type != bfd_link_hash_defined 6612 && fdh->elf.root.type != bfd_link_hash_defweak) 6613 fdh = NULL; 6614 } 6615 6616 skip = (sym_sec->owner != ibfd 6617 || sym_sec->output_section == bfd_abs_section_ptr); 6618 if (skip) 6619 { 6620 if (fdh != NULL && sym_sec->owner == ibfd) 6621 { 6622 /* Arrange for the function descriptor sym 6623 to be dropped. */ 6624 fdh->elf.root.u.def.value = 0; 6625 fdh->elf.root.u.def.section = sym_sec; 6626 } 6627 opd_adjust[rel->r_offset / 8] = -1; 6628 } 6629 else 6630 { 6631 /* We'll be keeping this opd entry. */ 6632 6633 if (fdh != NULL) 6634 { 6635 /* Redefine the function descriptor symbol to 6636 this location in the opd section. It is 6637 necessary to update the value here rather 6638 than using an array of adjustments as we do 6639 for local symbols, because various places 6640 in the generic ELF code use the value 6641 stored in u.def.value. */ 6642 fdh->elf.root.u.def.value = wptr - new_contents; 6643 fdh->adjust_done = 1; 6644 } 6645 6646 /* Local syms are a bit tricky. We could 6647 tweak them as they can be cached, but 6648 we'd need to look through the local syms 6649 for the function descriptor sym which we 6650 don't have at the moment. So keep an 6651 array of adjustments. */ 6652 opd_adjust[rel->r_offset / 8] 6653 = (wptr - new_contents) - (rptr - sec->contents); 6654 6655 if (wptr != rptr) 6656 memcpy (wptr, rptr, opd_ent_size); 6657 wptr += opd_ent_size; 6658 if (add_aux_fields && opd_ent_size == 16) 6659 { 6660 memset (wptr, '\0', 8); 6661 wptr += 8; 6662 } 6663 } 6664 rptr += opd_ent_size; 6665 offset += opd_ent_size; 6666 } 6667 6668 if (skip) 6669 { 6670 if (!NO_OPD_RELOCS 6671 && !info->relocatable 6672 && !dec_dynrel_count (rel->r_info, sec, info, 6673 NULL, h, sym_sec)) 6674 goto error_ret; 6675 } 6676 else 6677 { 6678 /* We need to adjust any reloc offsets to point to the 6679 new opd entries. While we're at it, we may as well 6680 remove redundant relocs. */ 6681 rel->r_offset += opd_adjust[(offset - opd_ent_size) / 8]; 6682 if (write_rel != rel) 6683 memcpy (write_rel, rel, sizeof (*rel)); 6684 ++write_rel; 6685 } 6686 } 6687 6688 sec->size = wptr - new_contents; 6689 sec->reloc_count = write_rel - relstart; 6690 if (add_aux_fields) 6691 { 6692 free (sec->contents); 6693 sec->contents = new_contents; 6694 } 6695 6696 /* Fudge the header size too, as this is used later in 6697 elf_bfd_final_link if we are emitting relocs. */ 6698 elf_section_data (sec)->rel_hdr.sh_size 6699 = sec->reloc_count * elf_section_data (sec)->rel_hdr.sh_entsize; 6700 BFD_ASSERT (elf_section_data (sec)->rel_hdr2 == NULL); 6701 some_edited = TRUE; 6702 } 6703 else if (elf_section_data (sec)->relocs != relstart) 6704 free (relstart); 6705 6706 if (local_syms != NULL 6707 && symtab_hdr->contents != (unsigned char *) local_syms) 6708 { 6709 if (!info->keep_memory) 6710 free (local_syms); 6711 else 6712 symtab_hdr->contents = (unsigned char *) local_syms; 6713 } 6714 } 6715 6716 if (some_edited) 6717 elf_link_hash_traverse (elf_hash_table (info), adjust_opd_syms, NULL); 6718 6719 /* If we are doing a final link and the last .opd entry is just 16 byte 6720 long, add a 8 byte padding after it. */ 6721 if (need_pad != NULL && !info->relocatable) 6722 { 6723 bfd_byte *p; 6724 6725 if ((need_pad->flags & SEC_IN_MEMORY) == 0) 6726 { 6727 BFD_ASSERT (need_pad->size > 0); 6728 6729 p = bfd_malloc (need_pad->size + 8); 6730 if (p == NULL) 6731 return FALSE; 6732 6733 if (! bfd_get_section_contents (need_pad->owner, need_pad, 6734 p, 0, need_pad->size)) 6735 return FALSE; 6736 6737 need_pad->contents = p; 6738 need_pad->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS); 6739 } 6740 else 6741 { 6742 p = bfd_realloc (need_pad->contents, need_pad->size + 8); 6743 if (p == NULL) 6744 return FALSE; 6745 6746 need_pad->contents = p; 6747 } 6748 6749 memset (need_pad->contents + need_pad->size, 0, 8); 6750 need_pad->size += 8; 6751 } 6752 6753 return TRUE; 6754} 6755 6756/* Set htab->tls_get_addr and call the generic ELF tls_setup function. */ 6757 6758asection * 6759ppc64_elf_tls_setup (bfd *obfd, struct bfd_link_info *info) 6760{ 6761 struct ppc_link_hash_table *htab; 6762 6763 htab = ppc_hash_table (info); 6764 if (htab->tls_get_addr != NULL) 6765 { 6766 struct ppc_link_hash_entry *h = htab->tls_get_addr; 6767 6768 while (h->elf.root.type == bfd_link_hash_indirect 6769 || h->elf.root.type == bfd_link_hash_warning) 6770 h = (struct ppc_link_hash_entry *) h->elf.root.u.i.link; 6771 6772 htab->tls_get_addr = h; 6773 6774 if (htab->tls_get_addr_fd == NULL 6775 && h->oh != NULL 6776 && h->oh->is_func_descriptor 6777 && (h->oh->elf.root.type == bfd_link_hash_defined 6778 || h->oh->elf.root.type == bfd_link_hash_defweak)) 6779 htab->tls_get_addr_fd = h->oh; 6780 } 6781 6782 if (htab->tls_get_addr_fd != NULL) 6783 { 6784 struct ppc_link_hash_entry *h = htab->tls_get_addr_fd; 6785 6786 while (h->elf.root.type == bfd_link_hash_indirect 6787 || h->elf.root.type == bfd_link_hash_warning) 6788 h = (struct ppc_link_hash_entry *) h->elf.root.u.i.link; 6789 6790 htab->tls_get_addr_fd = h; 6791 } 6792 6793 return _bfd_elf_tls_setup (obfd, info); 6794} 6795 6796/* Run through all the TLS relocs looking for optimization 6797 opportunities. The linker has been hacked (see ppc64elf.em) to do 6798 a preliminary section layout so that we know the TLS segment 6799 offsets. We can't optimize earlier because some optimizations need 6800 to know the tp offset, and we need to optimize before allocating 6801 dynamic relocations. */ 6802 6803bfd_boolean 6804ppc64_elf_tls_optimize (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) 6805{ 6806 bfd *ibfd; 6807 asection *sec; 6808 struct ppc_link_hash_table *htab; 6809 6810 if (info->relocatable || info->shared) 6811 return TRUE; 6812 6813 htab = ppc_hash_table (info); 6814 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 6815 { 6816 Elf_Internal_Sym *locsyms = NULL; 6817 asection *toc = bfd_get_section_by_name (ibfd, ".toc"); 6818 unsigned char *toc_ref = NULL; 6819 6820 /* Look at all the sections for this file, with TOC last. */ 6821 for (sec = (ibfd->sections == toc && toc && toc->next ? toc->next 6822 : ibfd->sections); 6823 sec != NULL; 6824 sec = (sec == toc ? NULL 6825 : sec->next == NULL ? toc 6826 : sec->next == toc && toc->next ? toc->next 6827 : sec->next)) 6828 if (sec->has_tls_reloc && !bfd_is_abs_section (sec->output_section)) 6829 { 6830 Elf_Internal_Rela *relstart, *rel, *relend; 6831 int expecting_tls_get_addr; 6832 long toc_ref_index = 0; 6833 6834 /* Read the relocations. */ 6835 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 6836 info->keep_memory); 6837 if (relstart == NULL) 6838 return FALSE; 6839 6840 expecting_tls_get_addr = 0; 6841 relend = relstart + sec->reloc_count; 6842 for (rel = relstart; rel < relend; rel++) 6843 { 6844 enum elf_ppc64_reloc_type r_type; 6845 unsigned long r_symndx; 6846 struct elf_link_hash_entry *h; 6847 Elf_Internal_Sym *sym; 6848 asection *sym_sec; 6849 char *tls_mask; 6850 char tls_set, tls_clear, tls_type = 0; 6851 bfd_vma value; 6852 bfd_boolean ok_tprel, is_local; 6853 6854 r_symndx = ELF64_R_SYM (rel->r_info); 6855 if (!get_sym_h (&h, &sym, &sym_sec, &tls_mask, &locsyms, 6856 r_symndx, ibfd)) 6857 { 6858 err_free_rel: 6859 if (elf_section_data (sec)->relocs != relstart) 6860 free (relstart); 6861 if (toc_ref != NULL) 6862 free (toc_ref); 6863 if (locsyms != NULL 6864 && (elf_tdata (ibfd)->symtab_hdr.contents 6865 != (unsigned char *) locsyms)) 6866 free (locsyms); 6867 return FALSE; 6868 } 6869 6870 if (h != NULL) 6871 { 6872 if (h->root.type != bfd_link_hash_defined 6873 && h->root.type != bfd_link_hash_defweak) 6874 continue; 6875 value = h->root.u.def.value; 6876 } 6877 else 6878 /* Symbols referenced by TLS relocs must be of type 6879 STT_TLS. So no need for .opd local sym adjust. */ 6880 value = sym->st_value; 6881 6882 ok_tprel = FALSE; 6883 is_local = FALSE; 6884 if (h == NULL 6885 || !h->def_dynamic) 6886 { 6887 is_local = TRUE; 6888 value += sym_sec->output_offset; 6889 value += sym_sec->output_section->vma; 6890 value -= htab->elf.tls_sec->vma; 6891 ok_tprel = (value + TP_OFFSET + ((bfd_vma) 1 << 31) 6892 < (bfd_vma) 1 << 32); 6893 } 6894 6895 r_type = ELF64_R_TYPE (rel->r_info); 6896 switch (r_type) 6897 { 6898 case R_PPC64_GOT_TLSLD16: 6899 case R_PPC64_GOT_TLSLD16_LO: 6900 case R_PPC64_GOT_TLSLD16_HI: 6901 case R_PPC64_GOT_TLSLD16_HA: 6902 /* These relocs should never be against a symbol 6903 defined in a shared lib. Leave them alone if 6904 that turns out to be the case. */ 6905 ppc64_tlsld_got (ibfd)->refcount -= 1; 6906 if (!is_local) 6907 continue; 6908 6909 /* LD -> LE */ 6910 tls_set = 0; 6911 tls_clear = TLS_LD; 6912 tls_type = TLS_TLS | TLS_LD; 6913 expecting_tls_get_addr = 1; 6914 break; 6915 6916 case R_PPC64_GOT_TLSGD16: 6917 case R_PPC64_GOT_TLSGD16_LO: 6918 case R_PPC64_GOT_TLSGD16_HI: 6919 case R_PPC64_GOT_TLSGD16_HA: 6920 if (ok_tprel) 6921 /* GD -> LE */ 6922 tls_set = 0; 6923 else 6924 /* GD -> IE */ 6925 tls_set = TLS_TLS | TLS_TPRELGD; 6926 tls_clear = TLS_GD; 6927 tls_type = TLS_TLS | TLS_GD; 6928 expecting_tls_get_addr = 1; 6929 break; 6930 6931 case R_PPC64_GOT_TPREL16_DS: 6932 case R_PPC64_GOT_TPREL16_LO_DS: 6933 case R_PPC64_GOT_TPREL16_HI: 6934 case R_PPC64_GOT_TPREL16_HA: 6935 expecting_tls_get_addr = 0; 6936 if (ok_tprel) 6937 { 6938 /* IE -> LE */ 6939 tls_set = 0; 6940 tls_clear = TLS_TPREL; 6941 tls_type = TLS_TLS | TLS_TPREL; 6942 break; 6943 } 6944 else 6945 continue; 6946 6947 case R_PPC64_REL14: 6948 case R_PPC64_REL14_BRTAKEN: 6949 case R_PPC64_REL14_BRNTAKEN: 6950 case R_PPC64_REL24: 6951 if (h != NULL 6952 && (h == &htab->tls_get_addr->elf 6953 || h == &htab->tls_get_addr_fd->elf)) 6954 { 6955 if (!expecting_tls_get_addr 6956 && rel != relstart 6957 && ((ELF64_R_TYPE (rel[-1].r_info) 6958 == R_PPC64_TOC16) 6959 || (ELF64_R_TYPE (rel[-1].r_info) 6960 == R_PPC64_TOC16_LO))) 6961 { 6962 /* Check for toc tls entries. */ 6963 char *toc_tls; 6964 int retval; 6965 6966 retval = get_tls_mask (&toc_tls, NULL, &locsyms, 6967 rel - 1, ibfd); 6968 if (retval == 0) 6969 goto err_free_rel; 6970 if (retval > 1 && toc_tls != NULL) 6971 { 6972 expecting_tls_get_addr = 1; 6973 if (toc_ref != NULL) 6974 toc_ref[toc_ref_index] = 1; 6975 } 6976 } 6977 6978 if (expecting_tls_get_addr) 6979 { 6980 struct plt_entry *ent; 6981 for (ent = h->plt.plist; ent; ent = ent->next) 6982 if (ent->addend == 0) 6983 { 6984 if (ent->plt.refcount > 0) 6985 ent->plt.refcount -= 1; 6986 break; 6987 } 6988 } 6989 } 6990 expecting_tls_get_addr = 0; 6991 continue; 6992 6993 case R_PPC64_TOC16: 6994 case R_PPC64_TOC16_LO: 6995 case R_PPC64_TLS: 6996 expecting_tls_get_addr = 0; 6997 if (sym_sec == toc && toc != NULL) 6998 { 6999 /* Mark this toc entry as referenced by a TLS 7000 code sequence. We can do that now in the 7001 case of R_PPC64_TLS, and after checking for 7002 tls_get_addr for the TOC16 relocs. */ 7003 if (toc_ref == NULL) 7004 { 7005 toc_ref = bfd_zmalloc (toc->size / 8); 7006 if (toc_ref == NULL) 7007 goto err_free_rel; 7008 } 7009 if (h != NULL) 7010 value = h->root.u.def.value; 7011 else 7012 value = sym->st_value; 7013 value += rel->r_addend; 7014 BFD_ASSERT (value < toc->size && value % 8 == 0); 7015 toc_ref_index = value / 8; 7016 if (r_type == R_PPC64_TLS) 7017 toc_ref[toc_ref_index] = 1; 7018 } 7019 continue; 7020 7021 case R_PPC64_TPREL64: 7022 expecting_tls_get_addr = 0; 7023 if (sec != toc 7024 || toc_ref == NULL 7025 || !toc_ref[rel->r_offset / 8]) 7026 continue; 7027 if (ok_tprel) 7028 { 7029 /* IE -> LE */ 7030 tls_set = TLS_EXPLICIT; 7031 tls_clear = TLS_TPREL; 7032 break; 7033 } 7034 else 7035 continue; 7036 7037 case R_PPC64_DTPMOD64: 7038 expecting_tls_get_addr = 0; 7039 if (sec != toc 7040 || toc_ref == NULL 7041 || !toc_ref[rel->r_offset / 8]) 7042 continue; 7043 if (rel + 1 < relend 7044 && (rel[1].r_info 7045 == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64)) 7046 && rel[1].r_offset == rel->r_offset + 8) 7047 { 7048 if (ok_tprel) 7049 /* GD -> LE */ 7050 tls_set = TLS_EXPLICIT | TLS_GD; 7051 else 7052 /* GD -> IE */ 7053 tls_set = TLS_EXPLICIT | TLS_GD | TLS_TPRELGD; 7054 tls_clear = TLS_GD; 7055 } 7056 else 7057 { 7058 if (!is_local) 7059 continue; 7060 7061 /* LD -> LE */ 7062 tls_set = TLS_EXPLICIT; 7063 tls_clear = TLS_LD; 7064 } 7065 break; 7066 7067 default: 7068 expecting_tls_get_addr = 0; 7069 continue; 7070 } 7071 7072 if ((tls_set & TLS_EXPLICIT) == 0) 7073 { 7074 struct got_entry *ent; 7075 7076 /* Adjust got entry for this reloc. */ 7077 if (h != NULL) 7078 ent = h->got.glist; 7079 else 7080 ent = elf_local_got_ents (ibfd)[r_symndx]; 7081 7082 for (; ent != NULL; ent = ent->next) 7083 if (ent->addend == rel->r_addend 7084 && ent->owner == ibfd 7085 && ent->tls_type == tls_type) 7086 break; 7087 if (ent == NULL) 7088 abort (); 7089 7090 if (tls_set == 0) 7091 { 7092 /* We managed to get rid of a got entry. */ 7093 if (ent->got.refcount > 0) 7094 ent->got.refcount -= 1; 7095 } 7096 } 7097 else 7098 { 7099 /* If we got rid of a DTPMOD/DTPREL reloc pair then 7100 we'll lose one or two dyn relocs. */ 7101 if (!dec_dynrel_count (rel->r_info, sec, info, 7102 NULL, h, sym_sec)) 7103 return FALSE; 7104 7105 if (tls_set == (TLS_EXPLICIT | TLS_GD)) 7106 { 7107 if (!dec_dynrel_count ((rel + 1)->r_info, sec, info, 7108 NULL, h, sym_sec)) 7109 return FALSE; 7110 } 7111 } 7112 7113 *tls_mask |= tls_set; 7114 *tls_mask &= ~tls_clear; 7115 } 7116 7117 if (elf_section_data (sec)->relocs != relstart) 7118 free (relstart); 7119 } 7120 7121 if (toc_ref != NULL) 7122 free (toc_ref); 7123 7124 if (locsyms != NULL 7125 && (elf_tdata (ibfd)->symtab_hdr.contents 7126 != (unsigned char *) locsyms)) 7127 { 7128 if (!info->keep_memory) 7129 free (locsyms); 7130 else 7131 elf_tdata (ibfd)->symtab_hdr.contents = (unsigned char *) locsyms; 7132 } 7133 } 7134 return TRUE; 7135} 7136 7137/* Called via elf_link_hash_traverse from ppc64_elf_edit_toc to adjust 7138 the values of any global symbols in a toc section that has been 7139 edited. Globals in toc sections should be a rarity, so this function 7140 sets a flag if any are found in toc sections other than the one just 7141 edited, so that futher hash table traversals can be avoided. */ 7142 7143struct adjust_toc_info 7144{ 7145 asection *toc; 7146 unsigned long *skip; 7147 bfd_boolean global_toc_syms; 7148}; 7149 7150static bfd_boolean 7151adjust_toc_syms (struct elf_link_hash_entry *h, void *inf) 7152{ 7153 struct ppc_link_hash_entry *eh; 7154 struct adjust_toc_info *toc_inf = (struct adjust_toc_info *) inf; 7155 7156 if (h->root.type == bfd_link_hash_indirect) 7157 return TRUE; 7158 7159 if (h->root.type == bfd_link_hash_warning) 7160 h = (struct elf_link_hash_entry *) h->root.u.i.link; 7161 7162 if (h->root.type != bfd_link_hash_defined 7163 && h->root.type != bfd_link_hash_defweak) 7164 return TRUE; 7165 7166 eh = (struct ppc_link_hash_entry *) h; 7167 if (eh->adjust_done) 7168 return TRUE; 7169 7170 if (eh->elf.root.u.def.section == toc_inf->toc) 7171 { 7172 unsigned long skip = toc_inf->skip[eh->elf.root.u.def.value >> 3]; 7173 if (skip != (unsigned long) -1) 7174 eh->elf.root.u.def.value -= skip; 7175 else 7176 { 7177 (*_bfd_error_handler) 7178 (_("%s defined in removed toc entry"), eh->elf.root.root.string); 7179 eh->elf.root.u.def.section = &bfd_abs_section; 7180 eh->elf.root.u.def.value = 0; 7181 } 7182 eh->adjust_done = 1; 7183 } 7184 else if (strcmp (eh->elf.root.u.def.section->name, ".toc") == 0) 7185 toc_inf->global_toc_syms = TRUE; 7186 7187 return TRUE; 7188} 7189 7190/* Examine all relocs referencing .toc sections in order to remove 7191 unused .toc entries. */ 7192 7193bfd_boolean 7194ppc64_elf_edit_toc (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) 7195{ 7196 bfd *ibfd; 7197 struct adjust_toc_info toc_inf; 7198 7199 toc_inf.global_toc_syms = TRUE; 7200 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 7201 { 7202 asection *toc, *sec; 7203 Elf_Internal_Shdr *symtab_hdr; 7204 Elf_Internal_Sym *local_syms; 7205 struct elf_link_hash_entry **sym_hashes; 7206 Elf_Internal_Rela *relstart, *rel; 7207 unsigned long *skip, *drop; 7208 unsigned char *used; 7209 unsigned char *keep, last, some_unused; 7210 7211 toc = bfd_get_section_by_name (ibfd, ".toc"); 7212 if (toc == NULL 7213 || toc->size == 0 7214 || toc->sec_info_type == ELF_INFO_TYPE_JUST_SYMS 7215 || elf_discarded_section (toc)) 7216 continue; 7217 7218 local_syms = NULL; 7219 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 7220 sym_hashes = elf_sym_hashes (ibfd); 7221 7222 /* Look at sections dropped from the final link. */ 7223 skip = NULL; 7224 relstart = NULL; 7225 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 7226 { 7227 if (sec->reloc_count == 0 7228 || !elf_discarded_section (sec) 7229 || get_opd_info (sec) 7230 || (sec->flags & SEC_ALLOC) == 0 7231 || (sec->flags & SEC_DEBUGGING) != 0) 7232 continue; 7233 7234 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, FALSE); 7235 if (relstart == NULL) 7236 goto error_ret; 7237 7238 /* Run through the relocs to see which toc entries might be 7239 unused. */ 7240 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 7241 { 7242 enum elf_ppc64_reloc_type r_type; 7243 unsigned long r_symndx; 7244 asection *sym_sec; 7245 struct elf_link_hash_entry *h; 7246 Elf_Internal_Sym *sym; 7247 bfd_vma val; 7248 7249 r_type = ELF64_R_TYPE (rel->r_info); 7250 switch (r_type) 7251 { 7252 default: 7253 continue; 7254 7255 case R_PPC64_TOC16: 7256 case R_PPC64_TOC16_LO: 7257 case R_PPC64_TOC16_HI: 7258 case R_PPC64_TOC16_HA: 7259 case R_PPC64_TOC16_DS: 7260 case R_PPC64_TOC16_LO_DS: 7261 break; 7262 } 7263 7264 r_symndx = ELF64_R_SYM (rel->r_info); 7265 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 7266 r_symndx, ibfd)) 7267 goto error_ret; 7268 7269 if (sym_sec != toc) 7270 continue; 7271 7272 if (h != NULL) 7273 val = h->root.u.def.value; 7274 else 7275 val = sym->st_value; 7276 val += rel->r_addend; 7277 7278 if (val >= toc->size) 7279 continue; 7280 7281 /* Anything in the toc ought to be aligned to 8 bytes. 7282 If not, don't mark as unused. */ 7283 if (val & 7) 7284 continue; 7285 7286 if (skip == NULL) 7287 { 7288 skip = bfd_zmalloc (sizeof (*skip) * (toc->size + 7) / 8); 7289 if (skip == NULL) 7290 goto error_ret; 7291 } 7292 7293 skip[val >> 3] = 1; 7294 } 7295 7296 if (elf_section_data (sec)->relocs != relstart) 7297 free (relstart); 7298 } 7299 7300 if (skip == NULL) 7301 continue; 7302 7303 used = bfd_zmalloc (sizeof (*used) * (toc->size + 7) / 8); 7304 if (used == NULL) 7305 { 7306 error_ret: 7307 if (local_syms != NULL 7308 && symtab_hdr->contents != (unsigned char *) local_syms) 7309 free (local_syms); 7310 if (sec != NULL 7311 && relstart != NULL 7312 && elf_section_data (sec)->relocs != relstart) 7313 free (relstart); 7314 if (skip != NULL) 7315 free (skip); 7316 return FALSE; 7317 } 7318 7319 /* Now check all kept sections that might reference the toc. 7320 Check the toc itself last. */ 7321 for (sec = (ibfd->sections == toc && toc->next ? toc->next 7322 : ibfd->sections); 7323 sec != NULL; 7324 sec = (sec == toc ? NULL 7325 : sec->next == NULL ? toc 7326 : sec->next == toc && toc->next ? toc->next 7327 : sec->next)) 7328 { 7329 int repeat; 7330 7331 if (sec->reloc_count == 0 7332 || elf_discarded_section (sec) 7333 || get_opd_info (sec) 7334 || (sec->flags & SEC_ALLOC) == 0 7335 || (sec->flags & SEC_DEBUGGING) != 0) 7336 continue; 7337 7338 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, TRUE); 7339 if (relstart == NULL) 7340 goto error_ret; 7341 7342 /* Mark toc entries referenced as used. */ 7343 repeat = 0; 7344 do 7345 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 7346 { 7347 enum elf_ppc64_reloc_type r_type; 7348 unsigned long r_symndx; 7349 asection *sym_sec; 7350 struct elf_link_hash_entry *h; 7351 Elf_Internal_Sym *sym; 7352 bfd_vma val; 7353 7354 r_type = ELF64_R_TYPE (rel->r_info); 7355 switch (r_type) 7356 { 7357 case R_PPC64_TOC16: 7358 case R_PPC64_TOC16_LO: 7359 case R_PPC64_TOC16_HI: 7360 case R_PPC64_TOC16_HA: 7361 case R_PPC64_TOC16_DS: 7362 case R_PPC64_TOC16_LO_DS: 7363 /* In case we're taking addresses of toc entries. */ 7364 case R_PPC64_ADDR64: 7365 break; 7366 7367 default: 7368 continue; 7369 } 7370 7371 r_symndx = ELF64_R_SYM (rel->r_info); 7372 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 7373 r_symndx, ibfd)) 7374 { 7375 free (used); 7376 goto error_ret; 7377 } 7378 7379 if (sym_sec != toc) 7380 continue; 7381 7382 if (h != NULL) 7383 val = h->root.u.def.value; 7384 else 7385 val = sym->st_value; 7386 val += rel->r_addend; 7387 7388 if (val >= toc->size) 7389 continue; 7390 7391 /* For the toc section, we only mark as used if 7392 this entry itself isn't unused. */ 7393 if (sec == toc 7394 && !used[val >> 3] 7395 && (used[rel->r_offset >> 3] 7396 || !skip[rel->r_offset >> 3])) 7397 /* Do all the relocs again, to catch reference 7398 chains. */ 7399 repeat = 1; 7400 7401 used[val >> 3] = 1; 7402 } 7403 while (repeat); 7404 } 7405 7406 /* Merge the used and skip arrays. Assume that TOC 7407 doublewords not appearing as either used or unused belong 7408 to to an entry more than one doubleword in size. */ 7409 for (drop = skip, keep = used, last = 0, some_unused = 0; 7410 drop < skip + (toc->size + 7) / 8; 7411 ++drop, ++keep) 7412 { 7413 if (*keep) 7414 { 7415 *drop = 0; 7416 last = 0; 7417 } 7418 else if (*drop) 7419 { 7420 some_unused = 1; 7421 last = 1; 7422 } 7423 else 7424 *drop = last; 7425 } 7426 7427 free (used); 7428 7429 if (some_unused) 7430 { 7431 bfd_byte *contents, *src; 7432 unsigned long off; 7433 7434 /* Shuffle the toc contents, and at the same time convert the 7435 skip array from booleans into offsets. */ 7436 if (!bfd_malloc_and_get_section (ibfd, toc, &contents)) 7437 goto error_ret; 7438 7439 elf_section_data (toc)->this_hdr.contents = contents; 7440 7441 for (src = contents, off = 0, drop = skip; 7442 src < contents + toc->size; 7443 src += 8, ++drop) 7444 { 7445 if (*drop) 7446 { 7447 *drop = (unsigned long) -1; 7448 off += 8; 7449 } 7450 else if (off != 0) 7451 { 7452 *drop = off; 7453 memcpy (src - off, src, 8); 7454 } 7455 } 7456 toc->rawsize = toc->size; 7457 toc->size = src - contents - off; 7458 7459 if (toc->reloc_count != 0) 7460 { 7461 Elf_Internal_Rela *wrel; 7462 bfd_size_type sz; 7463 7464 /* Read toc relocs. */ 7465 relstart = _bfd_elf_link_read_relocs (ibfd, toc, NULL, NULL, 7466 TRUE); 7467 if (relstart == NULL) 7468 goto error_ret; 7469 7470 /* Remove unused toc relocs, and adjust those we keep. */ 7471 wrel = relstart; 7472 for (rel = relstart; rel < relstart + toc->reloc_count; ++rel) 7473 if (skip[rel->r_offset >> 3] != (unsigned long) -1) 7474 { 7475 wrel->r_offset = rel->r_offset - skip[rel->r_offset >> 3]; 7476 wrel->r_info = rel->r_info; 7477 wrel->r_addend = rel->r_addend; 7478 ++wrel; 7479 } 7480 else if (!dec_dynrel_count (rel->r_info, toc, info, 7481 &local_syms, NULL, NULL)) 7482 goto error_ret; 7483 7484 toc->reloc_count = wrel - relstart; 7485 sz = elf_section_data (toc)->rel_hdr.sh_entsize; 7486 elf_section_data (toc)->rel_hdr.sh_size = toc->reloc_count * sz; 7487 BFD_ASSERT (elf_section_data (toc)->rel_hdr2 == NULL); 7488 } 7489 7490 /* Adjust addends for relocs against the toc section sym. */ 7491 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 7492 { 7493 if (sec->reloc_count == 0 7494 || elf_discarded_section (sec)) 7495 continue; 7496 7497 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 7498 TRUE); 7499 if (relstart == NULL) 7500 goto error_ret; 7501 7502 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 7503 { 7504 enum elf_ppc64_reloc_type r_type; 7505 unsigned long r_symndx; 7506 asection *sym_sec; 7507 struct elf_link_hash_entry *h; 7508 Elf_Internal_Sym *sym; 7509 7510 r_type = ELF64_R_TYPE (rel->r_info); 7511 switch (r_type) 7512 { 7513 default: 7514 continue; 7515 7516 case R_PPC64_TOC16: 7517 case R_PPC64_TOC16_LO: 7518 case R_PPC64_TOC16_HI: 7519 case R_PPC64_TOC16_HA: 7520 case R_PPC64_TOC16_DS: 7521 case R_PPC64_TOC16_LO_DS: 7522 case R_PPC64_ADDR64: 7523 break; 7524 } 7525 7526 r_symndx = ELF64_R_SYM (rel->r_info); 7527 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 7528 r_symndx, ibfd)) 7529 goto error_ret; 7530 7531 if (sym_sec != toc || h != NULL || sym->st_value != 0) 7532 continue; 7533 7534 rel->r_addend -= skip[rel->r_addend >> 3]; 7535 } 7536 } 7537 7538 /* We shouldn't have local or global symbols defined in the TOC, 7539 but handle them anyway. */ 7540 if (local_syms != NULL) 7541 { 7542 Elf_Internal_Sym *sym; 7543 7544 for (sym = local_syms; 7545 sym < local_syms + symtab_hdr->sh_info; 7546 ++sym) 7547 if (sym->st_shndx != SHN_UNDEF 7548 && (sym->st_shndx < SHN_LORESERVE 7549 || sym->st_shndx > SHN_HIRESERVE) 7550 && sym->st_value != 0 7551 && bfd_section_from_elf_index (ibfd, sym->st_shndx) == toc) 7552 { 7553 if (skip[sym->st_value >> 3] != (unsigned long) -1) 7554 sym->st_value -= skip[sym->st_value >> 3]; 7555 else 7556 { 7557 (*_bfd_error_handler) 7558 (_("%s defined in removed toc entry"), 7559 bfd_elf_sym_name (ibfd, symtab_hdr, sym, 7560 NULL)); 7561 sym->st_value = 0; 7562 sym->st_shndx = SHN_ABS; 7563 } 7564 symtab_hdr->contents = (unsigned char *) local_syms; 7565 } 7566 } 7567 7568 /* Finally, adjust any global syms defined in the toc. */ 7569 if (toc_inf.global_toc_syms) 7570 { 7571 toc_inf.toc = toc; 7572 toc_inf.skip = skip; 7573 toc_inf.global_toc_syms = FALSE; 7574 elf_link_hash_traverse (elf_hash_table (info), adjust_toc_syms, 7575 &toc_inf); 7576 } 7577 } 7578 7579 if (local_syms != NULL 7580 && symtab_hdr->contents != (unsigned char *) local_syms) 7581 { 7582 if (!info->keep_memory) 7583 free (local_syms); 7584 else 7585 symtab_hdr->contents = (unsigned char *) local_syms; 7586 } 7587 free (skip); 7588 } 7589 7590 return TRUE; 7591} 7592 7593/* Allocate space in .plt, .got and associated reloc sections for 7594 dynamic relocs. */ 7595 7596static bfd_boolean 7597allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) 7598{ 7599 struct bfd_link_info *info; 7600 struct ppc_link_hash_table *htab; 7601 asection *s; 7602 struct ppc_link_hash_entry *eh; 7603 struct ppc_dyn_relocs *p; 7604 struct got_entry *gent; 7605 7606 if (h->root.type == bfd_link_hash_indirect) 7607 return TRUE; 7608 7609 if (h->root.type == bfd_link_hash_warning) 7610 h = (struct elf_link_hash_entry *) h->root.u.i.link; 7611 7612 info = (struct bfd_link_info *) inf; 7613 htab = ppc_hash_table (info); 7614 7615 if (htab->elf.dynamic_sections_created 7616 && h->dynindx != -1 7617 && WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info->shared, h)) 7618 { 7619 struct plt_entry *pent; 7620 bfd_boolean doneone = FALSE; 7621 for (pent = h->plt.plist; pent != NULL; pent = pent->next) 7622 if (pent->plt.refcount > 0) 7623 { 7624 /* If this is the first .plt entry, make room for the special 7625 first entry. */ 7626 s = htab->plt; 7627 if (s->size == 0) 7628 s->size += PLT_INITIAL_ENTRY_SIZE; 7629 7630 pent->plt.offset = s->size; 7631 7632 /* Make room for this entry. */ 7633 s->size += PLT_ENTRY_SIZE; 7634 7635 /* Make room for the .glink code. */ 7636 s = htab->glink; 7637 if (s->size == 0) 7638 s->size += GLINK_CALL_STUB_SIZE; 7639 /* We need bigger stubs past index 32767. */ 7640 if (s->size >= GLINK_CALL_STUB_SIZE + 32768*2*4) 7641 s->size += 4; 7642 s->size += 2*4; 7643 7644 /* We also need to make an entry in the .rela.plt section. */ 7645 s = htab->relplt; 7646 s->size += sizeof (Elf64_External_Rela); 7647 doneone = TRUE; 7648 } 7649 else 7650 pent->plt.offset = (bfd_vma) -1; 7651 if (!doneone) 7652 { 7653 h->plt.plist = NULL; 7654 h->needs_plt = 0; 7655 } 7656 } 7657 else 7658 { 7659 h->plt.plist = NULL; 7660 h->needs_plt = 0; 7661 } 7662 7663 eh = (struct ppc_link_hash_entry *) h; 7664 /* Run through the TLS GD got entries first if we're changing them 7665 to TPREL. */ 7666 if ((eh->tls_mask & TLS_TPRELGD) != 0) 7667 for (gent = h->got.glist; gent != NULL; gent = gent->next) 7668 if (gent->got.refcount > 0 7669 && (gent->tls_type & TLS_GD) != 0) 7670 { 7671 /* This was a GD entry that has been converted to TPREL. If 7672 there happens to be a TPREL entry we can use that one. */ 7673 struct got_entry *ent; 7674 for (ent = h->got.glist; ent != NULL; ent = ent->next) 7675 if (ent->got.refcount > 0 7676 && (ent->tls_type & TLS_TPREL) != 0 7677 && ent->addend == gent->addend 7678 && ent->owner == gent->owner) 7679 { 7680 gent->got.refcount = 0; 7681 break; 7682 } 7683 7684 /* If not, then we'll be using our own TPREL entry. */ 7685 if (gent->got.refcount != 0) 7686 gent->tls_type = TLS_TLS | TLS_TPREL; 7687 } 7688 7689 for (gent = h->got.glist; gent != NULL; gent = gent->next) 7690 if (gent->got.refcount > 0) 7691 { 7692 bfd_boolean dyn; 7693 7694 /* Make sure this symbol is output as a dynamic symbol. 7695 Undefined weak syms won't yet be marked as dynamic, 7696 nor will all TLS symbols. */ 7697 if (h->dynindx == -1 7698 && !h->forced_local) 7699 { 7700 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 7701 return FALSE; 7702 } 7703 7704 if ((gent->tls_type & TLS_LD) != 0 7705 && !h->def_dynamic) 7706 { 7707 gent->got.offset = ppc64_tlsld_got (gent->owner)->offset; 7708 continue; 7709 } 7710 7711 s = ppc64_elf_tdata (gent->owner)->got; 7712 gent->got.offset = s->size; 7713 s->size 7714 += (gent->tls_type & eh->tls_mask & (TLS_GD | TLS_LD)) ? 16 : 8; 7715 dyn = htab->elf.dynamic_sections_created; 7716 if ((info->shared 7717 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)) 7718 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 7719 || h->root.type != bfd_link_hash_undefweak)) 7720 ppc64_elf_tdata (gent->owner)->relgot->size 7721 += (gent->tls_type & eh->tls_mask & TLS_GD 7722 ? 2 * sizeof (Elf64_External_Rela) 7723 : sizeof (Elf64_External_Rela)); 7724 } 7725 else 7726 gent->got.offset = (bfd_vma) -1; 7727 7728 if (eh->dyn_relocs == NULL) 7729 return TRUE; 7730 7731 /* In the shared -Bsymbolic case, discard space allocated for 7732 dynamic pc-relative relocs against symbols which turn out to be 7733 defined in regular objects. For the normal shared case, discard 7734 space for relocs that have become local due to symbol visibility 7735 changes. */ 7736 7737 if (info->shared) 7738 { 7739 /* Relocs that use pc_count are those that appear on a call insn, 7740 or certain REL relocs (see MUST_BE_DYN_RELOC) that can be 7741 generated via assembly. We want calls to protected symbols to 7742 resolve directly to the function rather than going via the plt. 7743 If people want function pointer comparisons to work as expected 7744 then they should avoid writing weird assembly. */ 7745 if (SYMBOL_CALLS_LOCAL (info, h)) 7746 { 7747 struct ppc_dyn_relocs **pp; 7748 7749 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 7750 { 7751 p->count -= p->pc_count; 7752 p->pc_count = 0; 7753 if (p->count == 0) 7754 *pp = p->next; 7755 else 7756 pp = &p->next; 7757 } 7758 } 7759 7760 /* Also discard relocs on undefined weak syms with non-default 7761 visibility. */ 7762 if (eh->dyn_relocs != NULL 7763 && h->root.type == bfd_link_hash_undefweak) 7764 { 7765 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 7766 eh->dyn_relocs = NULL; 7767 7768 /* Make sure this symbol is output as a dynamic symbol. 7769 Undefined weak syms won't yet be marked as dynamic. */ 7770 else if (h->dynindx == -1 7771 && !h->forced_local) 7772 { 7773 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 7774 return FALSE; 7775 } 7776 } 7777 } 7778 else if (ELIMINATE_COPY_RELOCS) 7779 { 7780 /* For the non-shared case, discard space for relocs against 7781 symbols which turn out to need copy relocs or are not 7782 dynamic. */ 7783 7784 if (!h->non_got_ref 7785 && h->def_dynamic 7786 && !h->def_regular) 7787 { 7788 /* Make sure this symbol is output as a dynamic symbol. 7789 Undefined weak syms won't yet be marked as dynamic. */ 7790 if (h->dynindx == -1 7791 && !h->forced_local) 7792 { 7793 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 7794 return FALSE; 7795 } 7796 7797 /* If that succeeded, we know we'll be keeping all the 7798 relocs. */ 7799 if (h->dynindx != -1) 7800 goto keep; 7801 } 7802 7803 eh->dyn_relocs = NULL; 7804 7805 keep: ; 7806 } 7807 7808 /* Finally, allocate space. */ 7809 for (p = eh->dyn_relocs; p != NULL; p = p->next) 7810 { 7811 asection *sreloc = elf_section_data (p->sec)->sreloc; 7812 sreloc->size += p->count * sizeof (Elf64_External_Rela); 7813 } 7814 7815 return TRUE; 7816} 7817 7818/* Find any dynamic relocs that apply to read-only sections. */ 7819 7820static bfd_boolean 7821readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) 7822{ 7823 struct ppc_link_hash_entry *eh; 7824 struct ppc_dyn_relocs *p; 7825 7826 if (h->root.type == bfd_link_hash_warning) 7827 h = (struct elf_link_hash_entry *) h->root.u.i.link; 7828 7829 eh = (struct ppc_link_hash_entry *) h; 7830 for (p = eh->dyn_relocs; p != NULL; p = p->next) 7831 { 7832 asection *s = p->sec->output_section; 7833 7834 if (s != NULL && (s->flags & SEC_READONLY) != 0) 7835 { 7836 struct bfd_link_info *info = inf; 7837 7838 info->flags |= DF_TEXTREL; 7839 7840 /* Not an error, just cut short the traversal. */ 7841 return FALSE; 7842 } 7843 } 7844 return TRUE; 7845} 7846 7847/* Set the sizes of the dynamic sections. */ 7848 7849static bfd_boolean 7850ppc64_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 7851 struct bfd_link_info *info) 7852{ 7853 struct ppc_link_hash_table *htab; 7854 bfd *dynobj; 7855 asection *s; 7856 bfd_boolean relocs; 7857 bfd *ibfd; 7858 7859 htab = ppc_hash_table (info); 7860 dynobj = htab->elf.dynobj; 7861 if (dynobj == NULL) 7862 abort (); 7863 7864 if (htab->elf.dynamic_sections_created) 7865 { 7866 /* Set the contents of the .interp section to the interpreter. */ 7867 if (info->executable) 7868 { 7869 s = bfd_get_section_by_name (dynobj, ".interp"); 7870 if (s == NULL) 7871 abort (); 7872 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 7873 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 7874 } 7875 } 7876 7877 /* Set up .got offsets for local syms, and space for local dynamic 7878 relocs. */ 7879 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 7880 { 7881 struct got_entry **lgot_ents; 7882 struct got_entry **end_lgot_ents; 7883 char *lgot_masks; 7884 bfd_size_type locsymcount; 7885 Elf_Internal_Shdr *symtab_hdr; 7886 asection *srel; 7887 7888 if (!is_ppc64_elf_target (ibfd->xvec)) 7889 continue; 7890 7891 if (ppc64_tlsld_got (ibfd)->refcount > 0) 7892 { 7893 s = ppc64_elf_tdata (ibfd)->got; 7894 ppc64_tlsld_got (ibfd)->offset = s->size; 7895 s->size += 16; 7896 if (info->shared) 7897 { 7898 srel = ppc64_elf_tdata (ibfd)->relgot; 7899 srel->size += sizeof (Elf64_External_Rela); 7900 } 7901 } 7902 else 7903 ppc64_tlsld_got (ibfd)->offset = (bfd_vma) -1; 7904 7905 for (s = ibfd->sections; s != NULL; s = s->next) 7906 { 7907 struct ppc_dyn_relocs *p; 7908 7909 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 7910 { 7911 if (!bfd_is_abs_section (p->sec) 7912 && bfd_is_abs_section (p->sec->output_section)) 7913 { 7914 /* Input section has been discarded, either because 7915 it is a copy of a linkonce section or due to 7916 linker script /DISCARD/, so we'll be discarding 7917 the relocs too. */ 7918 } 7919 else if (p->count != 0) 7920 { 7921 srel = elf_section_data (p->sec)->sreloc; 7922 srel->size += p->count * sizeof (Elf64_External_Rela); 7923 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 7924 info->flags |= DF_TEXTREL; 7925 } 7926 } 7927 } 7928 7929 lgot_ents = elf_local_got_ents (ibfd); 7930 if (!lgot_ents) 7931 continue; 7932 7933 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 7934 locsymcount = symtab_hdr->sh_info; 7935 end_lgot_ents = lgot_ents + locsymcount; 7936 lgot_masks = (char *) end_lgot_ents; 7937 s = ppc64_elf_tdata (ibfd)->got; 7938 srel = ppc64_elf_tdata (ibfd)->relgot; 7939 for (; lgot_ents < end_lgot_ents; ++lgot_ents, ++lgot_masks) 7940 { 7941 struct got_entry *ent; 7942 7943 for (ent = *lgot_ents; ent != NULL; ent = ent->next) 7944 if (ent->got.refcount > 0) 7945 { 7946 if ((ent->tls_type & *lgot_masks & TLS_LD) != 0) 7947 { 7948 if (ppc64_tlsld_got (ibfd)->offset == (bfd_vma) -1) 7949 { 7950 ppc64_tlsld_got (ibfd)->offset = s->size; 7951 s->size += 16; 7952 if (info->shared) 7953 srel->size += sizeof (Elf64_External_Rela); 7954 } 7955 ent->got.offset = ppc64_tlsld_got (ibfd)->offset; 7956 } 7957 else 7958 { 7959 ent->got.offset = s->size; 7960 if ((ent->tls_type & *lgot_masks & TLS_GD) != 0) 7961 { 7962 s->size += 16; 7963 if (info->shared) 7964 srel->size += 2 * sizeof (Elf64_External_Rela); 7965 } 7966 else 7967 { 7968 s->size += 8; 7969 if (info->shared) 7970 srel->size += sizeof (Elf64_External_Rela); 7971 } 7972 } 7973 } 7974 else 7975 ent->got.offset = (bfd_vma) -1; 7976 } 7977 } 7978 7979 /* Allocate global sym .plt and .got entries, and space for global 7980 sym dynamic relocs. */ 7981 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); 7982 7983 /* We now have determined the sizes of the various dynamic sections. 7984 Allocate memory for them. */ 7985 relocs = FALSE; 7986 for (s = dynobj->sections; s != NULL; s = s->next) 7987 { 7988 if ((s->flags & SEC_LINKER_CREATED) == 0) 7989 continue; 7990 7991 if (s == htab->brlt || s == htab->relbrlt) 7992 /* These haven't been allocated yet; don't strip. */ 7993 continue; 7994 else if (s == htab->got 7995 || s == htab->plt 7996 || s == htab->glink 7997 || s == htab->dynbss) 7998 { 7999 /* Strip this section if we don't need it; see the 8000 comment below. */ 8001 } 8002 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) 8003 { 8004 if (s->size != 0) 8005 { 8006 if (s != htab->relplt) 8007 relocs = TRUE; 8008 8009 /* We use the reloc_count field as a counter if we need 8010 to copy relocs into the output file. */ 8011 s->reloc_count = 0; 8012 } 8013 } 8014 else 8015 { 8016 /* It's not one of our sections, so don't allocate space. */ 8017 continue; 8018 } 8019 8020 if (s->size == 0) 8021 { 8022 /* If we don't need this section, strip it from the 8023 output file. This is mostly to handle .rela.bss and 8024 .rela.plt. We must create both sections in 8025 create_dynamic_sections, because they must be created 8026 before the linker maps input sections to output 8027 sections. The linker does that before 8028 adjust_dynamic_symbol is called, and it is that 8029 function which decides whether anything needs to go 8030 into these sections. */ 8031 s->flags |= SEC_EXCLUDE; 8032 continue; 8033 } 8034 8035 if ((s->flags & SEC_HAS_CONTENTS) == 0) 8036 continue; 8037 8038 /* Allocate memory for the section contents. We use bfd_zalloc 8039 here in case unused entries are not reclaimed before the 8040 section's contents are written out. This should not happen, 8041 but this way if it does we get a R_PPC64_NONE reloc in .rela 8042 sections instead of garbage. 8043 We also rely on the section contents being zero when writing 8044 the GOT. */ 8045 s->contents = bfd_zalloc (dynobj, s->size); 8046 if (s->contents == NULL) 8047 return FALSE; 8048 } 8049 8050 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 8051 { 8052 if (!is_ppc64_elf_target (ibfd->xvec)) 8053 continue; 8054 8055 s = ppc64_elf_tdata (ibfd)->got; 8056 if (s != NULL && s != htab->got) 8057 { 8058 if (s->size == 0) 8059 s->flags |= SEC_EXCLUDE; 8060 else 8061 { 8062 s->contents = bfd_zalloc (ibfd, s->size); 8063 if (s->contents == NULL) 8064 return FALSE; 8065 } 8066 } 8067 s = ppc64_elf_tdata (ibfd)->relgot; 8068 if (s != NULL) 8069 { 8070 if (s->size == 0) 8071 s->flags |= SEC_EXCLUDE; 8072 else 8073 { 8074 s->contents = bfd_zalloc (ibfd, s->size); 8075 if (s->contents == NULL) 8076 return FALSE; 8077 relocs = TRUE; 8078 s->reloc_count = 0; 8079 } 8080 } 8081 } 8082 8083 if (htab->elf.dynamic_sections_created) 8084 { 8085 /* Add some entries to the .dynamic section. We fill in the 8086 values later, in ppc64_elf_finish_dynamic_sections, but we 8087 must add the entries now so that we get the correct size for 8088 the .dynamic section. The DT_DEBUG entry is filled in by the 8089 dynamic linker and used by the debugger. */ 8090#define add_dynamic_entry(TAG, VAL) \ 8091 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 8092 8093 if (info->executable) 8094 { 8095 if (!add_dynamic_entry (DT_DEBUG, 0)) 8096 return FALSE; 8097 } 8098 8099 if (htab->plt != NULL && htab->plt->size != 0) 8100 { 8101 if (!add_dynamic_entry (DT_PLTGOT, 0) 8102 || !add_dynamic_entry (DT_PLTRELSZ, 0) 8103 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 8104 || !add_dynamic_entry (DT_JMPREL, 0) 8105 || !add_dynamic_entry (DT_PPC64_GLINK, 0)) 8106 return FALSE; 8107 } 8108 8109 if (NO_OPD_RELOCS) 8110 { 8111 if (!add_dynamic_entry (DT_PPC64_OPD, 0) 8112 || !add_dynamic_entry (DT_PPC64_OPDSZ, 0)) 8113 return FALSE; 8114 } 8115 8116 if (relocs) 8117 { 8118 if (!add_dynamic_entry (DT_RELA, 0) 8119 || !add_dynamic_entry (DT_RELASZ, 0) 8120 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) 8121 return FALSE; 8122 8123 /* If any dynamic relocs apply to a read-only section, 8124 then we need a DT_TEXTREL entry. */ 8125 if ((info->flags & DF_TEXTREL) == 0) 8126 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info); 8127 8128 if ((info->flags & DF_TEXTREL) != 0) 8129 { 8130 if (!add_dynamic_entry (DT_TEXTREL, 0)) 8131 return FALSE; 8132 } 8133 } 8134 } 8135#undef add_dynamic_entry 8136 8137 return TRUE; 8138} 8139 8140/* Determine the type of stub needed, if any, for a call. */ 8141 8142static inline enum ppc_stub_type 8143ppc_type_of_stub (asection *input_sec, 8144 const Elf_Internal_Rela *rel, 8145 struct ppc_link_hash_entry **hash, 8146 bfd_vma destination) 8147{ 8148 struct ppc_link_hash_entry *h = *hash; 8149 bfd_vma location; 8150 bfd_vma branch_offset; 8151 bfd_vma max_branch_offset; 8152 enum elf_ppc64_reloc_type r_type; 8153 8154 if (h != NULL) 8155 { 8156 struct ppc_link_hash_entry *fdh = h; 8157 if (fdh->oh != NULL 8158 && fdh->oh->is_func_descriptor) 8159 fdh = fdh->oh; 8160 8161 if (fdh->elf.dynindx != -1) 8162 { 8163 struct plt_entry *ent; 8164 8165 for (ent = fdh->elf.plt.plist; ent != NULL; ent = ent->next) 8166 if (ent->addend == rel->r_addend 8167 && ent->plt.offset != (bfd_vma) -1) 8168 { 8169 *hash = fdh; 8170 return ppc_stub_plt_call; 8171 } 8172 } 8173 8174 /* Here, we know we don't have a plt entry. If we don't have a 8175 either a defined function descriptor or a defined entry symbol 8176 in a regular object file, then it is pointless trying to make 8177 any other type of stub. */ 8178 if (!((fdh->elf.root.type == bfd_link_hash_defined 8179 || fdh->elf.root.type == bfd_link_hash_defweak) 8180 && fdh->elf.root.u.def.section->output_section != NULL) 8181 && !((h->elf.root.type == bfd_link_hash_defined 8182 || h->elf.root.type == bfd_link_hash_defweak) 8183 && h->elf.root.u.def.section->output_section != NULL)) 8184 return ppc_stub_none; 8185 } 8186 8187 /* Determine where the call point is. */ 8188 location = (input_sec->output_offset 8189 + input_sec->output_section->vma 8190 + rel->r_offset); 8191 8192 branch_offset = destination - location; 8193 r_type = ELF64_R_TYPE (rel->r_info); 8194 8195 /* Determine if a long branch stub is needed. */ 8196 max_branch_offset = 1 << 25; 8197 if (r_type != R_PPC64_REL24) 8198 max_branch_offset = 1 << 15; 8199 8200 if (branch_offset + max_branch_offset >= 2 * max_branch_offset) 8201 /* We need a stub. Figure out whether a long_branch or plt_branch 8202 is needed later. */ 8203 return ppc_stub_long_branch; 8204 8205 return ppc_stub_none; 8206} 8207 8208/* Build a .plt call stub. */ 8209 8210static inline bfd_byte * 8211build_plt_stub (bfd *obfd, bfd_byte *p, int offset) 8212{ 8213#define PPC_LO(v) ((v) & 0xffff) 8214#define PPC_HI(v) (((v) >> 16) & 0xffff) 8215#define PPC_HA(v) PPC_HI ((v) + 0x8000) 8216 8217 bfd_put_32 (obfd, ADDIS_R12_R2 | PPC_HA (offset), p), p += 4; 8218 bfd_put_32 (obfd, STD_R2_40R1, p), p += 4; 8219 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4; 8220 if (PPC_HA (offset + 8) != PPC_HA (offset)) 8221 bfd_put_32 (obfd, ADDIS_R12_R12 | 1, p), p += 4; 8222 offset += 8; 8223 bfd_put_32 (obfd, LD_R2_0R12 | PPC_LO (offset), p), p += 4; 8224 if (PPC_HA (offset + 8) != PPC_HA (offset)) 8225 bfd_put_32 (obfd, ADDIS_R12_R12 | 1, p), p += 4; 8226 offset += 8; 8227 bfd_put_32 (obfd, MTCTR_R11, p), p += 4; 8228 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4; 8229 bfd_put_32 (obfd, BCTR, p), p += 4; 8230 return p; 8231} 8232 8233static bfd_boolean 8234ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) 8235{ 8236 struct ppc_stub_hash_entry *stub_entry; 8237 struct ppc_branch_hash_entry *br_entry; 8238 struct bfd_link_info *info; 8239 struct ppc_link_hash_table *htab; 8240 bfd_byte *loc; 8241 bfd_byte *p; 8242 unsigned int indx; 8243 struct plt_entry *ent; 8244 bfd_vma dest, off; 8245 int size; 8246 8247 /* Massage our args to the form they really have. */ 8248 stub_entry = (struct ppc_stub_hash_entry *) gen_entry; 8249 info = in_arg; 8250 8251 htab = ppc_hash_table (info); 8252 8253 /* Make a note of the offset within the stubs for this entry. */ 8254 stub_entry->stub_offset = stub_entry->stub_sec->size; 8255 loc = stub_entry->stub_sec->contents + stub_entry->stub_offset; 8256 8257 htab->stub_count[stub_entry->stub_type - 1] += 1; 8258 switch (stub_entry->stub_type) 8259 { 8260 case ppc_stub_long_branch: 8261 case ppc_stub_long_branch_r2off: 8262 /* Branches are relative. This is where we are going to. */ 8263 off = dest = (stub_entry->target_value 8264 + stub_entry->target_section->output_offset 8265 + stub_entry->target_section->output_section->vma); 8266 8267 /* And this is where we are coming from. */ 8268 off -= (stub_entry->stub_offset 8269 + stub_entry->stub_sec->output_offset 8270 + stub_entry->stub_sec->output_section->vma); 8271 8272 if (stub_entry->stub_type != ppc_stub_long_branch_r2off) 8273 size = 4; 8274 else 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 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc); 8283 loc += 4; 8284 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc); 8285 loc += 4; 8286 off -= 12; 8287 size = 16; 8288 } 8289 bfd_put_32 (htab->stub_bfd, B_DOT | (off & 0x3fffffc), loc); 8290 8291 if (off + (1 << 25) >= (bfd_vma) (1 << 26)) 8292 { 8293 (*_bfd_error_handler) (_("long branch stub `%s' offset overflow"), 8294 stub_entry->root.string); 8295 htab->stub_error = TRUE; 8296 return FALSE; 8297 } 8298 8299 if (info->emitrelocations) 8300 { 8301 Elf_Internal_Rela *relocs, *r; 8302 struct bfd_elf_section_data *elfsec_data; 8303 8304 elfsec_data = elf_section_data (stub_entry->stub_sec); 8305 relocs = elfsec_data->relocs; 8306 if (relocs == NULL) 8307 { 8308 bfd_size_type relsize; 8309 relsize = stub_entry->stub_sec->reloc_count * sizeof (*relocs); 8310 relocs = bfd_alloc (htab->stub_bfd, relsize); 8311 if (relocs == NULL) 8312 return FALSE; 8313 elfsec_data->relocs = relocs; 8314 elfsec_data->rel_hdr.sh_size = relsize; 8315 elfsec_data->rel_hdr.sh_entsize = 24; 8316 stub_entry->stub_sec->reloc_count = 0; 8317 } 8318 r = relocs + stub_entry->stub_sec->reloc_count; 8319 stub_entry->stub_sec->reloc_count += 1; 8320 r->r_offset = loc - stub_entry->stub_sec->contents; 8321 r->r_info = ELF64_R_INFO (0, R_PPC64_REL24); 8322 r->r_addend = dest; 8323 if (stub_entry->h != NULL) 8324 { 8325 struct elf_link_hash_entry **hashes; 8326 unsigned long symndx; 8327 struct ppc_link_hash_entry *h; 8328 8329 hashes = elf_sym_hashes (htab->stub_bfd); 8330 if (hashes == NULL) 8331 { 8332 bfd_size_type hsize; 8333 8334 hsize = (htab->stub_globals + 1) * sizeof (*hashes); 8335 hashes = bfd_zalloc (htab->stub_bfd, hsize); 8336 if (hashes == NULL) 8337 return FALSE; 8338 elf_sym_hashes (htab->stub_bfd) = hashes; 8339 htab->stub_globals = 1; 8340 } 8341 symndx = htab->stub_globals++; 8342 h = stub_entry->h; 8343 hashes[symndx] = &h->elf; 8344 r->r_info = ELF64_R_INFO (symndx, R_PPC64_REL24); 8345 if (h->oh != NULL && h->oh->is_func) 8346 h = h->oh; 8347 if (h->elf.root.u.def.section != stub_entry->target_section) 8348 /* H is an opd symbol. The addend must be zero. */ 8349 r->r_addend = 0; 8350 else 8351 { 8352 off = (h->elf.root.u.def.value 8353 + h->elf.root.u.def.section->output_offset 8354 + h->elf.root.u.def.section->output_section->vma); 8355 r->r_addend -= off; 8356 } 8357 } 8358 } 8359 break; 8360 8361 case ppc_stub_plt_branch: 8362 case ppc_stub_plt_branch_r2off: 8363 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table, 8364 stub_entry->root.string + 9, 8365 FALSE, FALSE); 8366 if (br_entry == NULL) 8367 { 8368 (*_bfd_error_handler) (_("can't find branch stub `%s'"), 8369 stub_entry->root.string); 8370 htab->stub_error = TRUE; 8371 return FALSE; 8372 } 8373 8374 off = (stub_entry->target_value 8375 + stub_entry->target_section->output_offset 8376 + stub_entry->target_section->output_section->vma); 8377 8378 bfd_put_64 (htab->brlt->owner, off, 8379 htab->brlt->contents + br_entry->offset); 8380 8381 if (htab->relbrlt != NULL) 8382 { 8383 /* Create a reloc for the branch lookup table entry. */ 8384 Elf_Internal_Rela rela; 8385 bfd_byte *rl; 8386 8387 rela.r_offset = (br_entry->offset 8388 + htab->brlt->output_offset 8389 + htab->brlt->output_section->vma); 8390 rela.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); 8391 rela.r_addend = off; 8392 8393 rl = htab->relbrlt->contents; 8394 rl += htab->relbrlt->reloc_count++ * sizeof (Elf64_External_Rela); 8395 bfd_elf64_swap_reloca_out (htab->relbrlt->owner, &rela, rl); 8396 } 8397 8398 off = (br_entry->offset 8399 + htab->brlt->output_offset 8400 + htab->brlt->output_section->vma 8401 - elf_gp (htab->brlt->output_section->owner) 8402 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8403 8404 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0) 8405 { 8406 (*_bfd_error_handler) 8407 (_("linkage table error against `%s'"), 8408 stub_entry->root.string); 8409 bfd_set_error (bfd_error_bad_value); 8410 htab->stub_error = TRUE; 8411 return FALSE; 8412 } 8413 8414 indx = off; 8415 if (stub_entry->stub_type != ppc_stub_plt_branch_r2off) 8416 { 8417 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (indx), loc); 8418 loc += 4; 8419 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (indx), loc); 8420 size = 16; 8421 } 8422 else 8423 { 8424 bfd_vma r2off; 8425 8426 r2off = (htab->stub_group[stub_entry->target_section->id].toc_off 8427 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8428 bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc); 8429 loc += 4; 8430 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (indx), loc); 8431 loc += 4; 8432 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (indx), loc); 8433 loc += 4; 8434 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc); 8435 loc += 4; 8436 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc); 8437 size = 28; 8438 } 8439 loc += 4; 8440 bfd_put_32 (htab->stub_bfd, MTCTR_R11, loc); 8441 loc += 4; 8442 bfd_put_32 (htab->stub_bfd, BCTR, loc); 8443 break; 8444 8445 case ppc_stub_plt_call: 8446 /* Do the best we can for shared libraries built without 8447 exporting ".foo" for each "foo". This can happen when symbol 8448 versioning scripts strip all bar a subset of symbols. */ 8449 if (stub_entry->h->oh != NULL 8450 && stub_entry->h->oh->elf.root.type != bfd_link_hash_defined 8451 && stub_entry->h->oh->elf.root.type != bfd_link_hash_defweak) 8452 { 8453 /* Point the symbol at the stub. There may be multiple stubs, 8454 we don't really care; The main thing is to make this sym 8455 defined somewhere. Maybe defining the symbol in the stub 8456 section is a silly idea. If we didn't do this, htab->top_id 8457 could disappear. */ 8458 stub_entry->h->oh->elf.root.type = bfd_link_hash_defined; 8459 stub_entry->h->oh->elf.root.u.def.section = stub_entry->stub_sec; 8460 stub_entry->h->oh->elf.root.u.def.value = stub_entry->stub_offset; 8461 } 8462 8463 /* Now build the stub. */ 8464 off = (bfd_vma) -1; 8465 for (ent = stub_entry->h->elf.plt.plist; ent != NULL; ent = ent->next) 8466 if (ent->addend == stub_entry->addend) 8467 { 8468 off = ent->plt.offset; 8469 break; 8470 } 8471 if (off >= (bfd_vma) -2) 8472 abort (); 8473 8474 off &= ~ (bfd_vma) 1; 8475 off += (htab->plt->output_offset 8476 + htab->plt->output_section->vma 8477 - elf_gp (htab->plt->output_section->owner) 8478 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8479 8480 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0) 8481 { 8482 (*_bfd_error_handler) 8483 (_("linkage table error against `%s'"), 8484 stub_entry->h->elf.root.root.string); 8485 bfd_set_error (bfd_error_bad_value); 8486 htab->stub_error = TRUE; 8487 return FALSE; 8488 } 8489 8490 p = build_plt_stub (htab->stub_bfd, loc, off); 8491 size = p - loc; 8492 break; 8493 8494 default: 8495 BFD_FAIL (); 8496 return FALSE; 8497 } 8498 8499 stub_entry->stub_sec->size += size; 8500 8501 if (htab->emit_stub_syms) 8502 { 8503 struct elf_link_hash_entry *h; 8504 size_t len1, len2; 8505 char *name; 8506 const char *const stub_str[] = { "long_branch", 8507 "long_branch_r2off", 8508 "plt_branch", 8509 "plt_branch_r2off", 8510 "plt_call" }; 8511 8512 len1 = strlen (stub_str[stub_entry->stub_type - 1]); 8513 len2 = strlen (stub_entry->root.string); 8514 name = bfd_malloc (len1 + len2 + 2); 8515 if (name == NULL) 8516 return FALSE; 8517 memcpy (name, stub_entry->root.string, 9); 8518 memcpy (name + 9, stub_str[stub_entry->stub_type - 1], len1); 8519 memcpy (name + len1 + 9, stub_entry->root.string + 8, len2 - 8 + 1); 8520 h = elf_link_hash_lookup (&htab->elf, name, TRUE, FALSE, FALSE); 8521 if (h == NULL) 8522 return FALSE; 8523 if (h->root.type == bfd_link_hash_new) 8524 { 8525 h->root.type = bfd_link_hash_defined; 8526 h->root.u.def.section = stub_entry->stub_sec; 8527 h->root.u.def.value = stub_entry->stub_offset; 8528 h->ref_regular = 1; 8529 h->def_regular = 1; 8530 h->ref_regular_nonweak = 1; 8531 h->forced_local = 1; 8532 h->non_elf = 0; 8533 } 8534 } 8535 8536 return TRUE; 8537} 8538 8539/* As above, but don't actually build the stub. Just bump offset so 8540 we know stub section sizes, and select plt_branch stubs where 8541 long_branch stubs won't do. */ 8542 8543static bfd_boolean 8544ppc_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) 8545{ 8546 struct ppc_stub_hash_entry *stub_entry; 8547 struct bfd_link_info *info; 8548 struct ppc_link_hash_table *htab; 8549 bfd_vma off; 8550 int size; 8551 8552 /* Massage our args to the form they really have. */ 8553 stub_entry = (struct ppc_stub_hash_entry *) gen_entry; 8554 info = in_arg; 8555 8556 htab = ppc_hash_table (info); 8557 8558 if (stub_entry->stub_type == ppc_stub_plt_call) 8559 { 8560 struct plt_entry *ent; 8561 off = (bfd_vma) -1; 8562 for (ent = stub_entry->h->elf.plt.plist; ent != NULL; ent = ent->next) 8563 if (ent->addend == stub_entry->addend) 8564 { 8565 off = ent->plt.offset & ~(bfd_vma) 1; 8566 break; 8567 } 8568 if (off >= (bfd_vma) -2) 8569 abort (); 8570 off += (htab->plt->output_offset 8571 + htab->plt->output_section->vma 8572 - elf_gp (htab->plt->output_section->owner) 8573 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8574 8575 size = PLT_CALL_STUB_SIZE; 8576 if (PPC_HA (off + 16) != PPC_HA (off)) 8577 size += 4; 8578 } 8579 else 8580 { 8581 /* ppc_stub_long_branch or ppc_stub_plt_branch, or their r2off 8582 variants. */ 8583 off = (stub_entry->target_value 8584 + stub_entry->target_section->output_offset 8585 + stub_entry->target_section->output_section->vma); 8586 off -= (stub_entry->stub_sec->size 8587 + stub_entry->stub_sec->output_offset 8588 + stub_entry->stub_sec->output_section->vma); 8589 8590 /* Reset the stub type from the plt variant in case we now 8591 can reach with a shorter stub. */ 8592 if (stub_entry->stub_type >= ppc_stub_plt_branch) 8593 stub_entry->stub_type += ppc_stub_long_branch - ppc_stub_plt_branch; 8594 8595 size = 4; 8596 if (stub_entry->stub_type == ppc_stub_long_branch_r2off) 8597 { 8598 off -= 12; 8599 size = 16; 8600 } 8601 8602 /* If the branch offset if too big, use a ppc_stub_plt_branch. */ 8603 if (off + (1 << 25) >= (bfd_vma) (1 << 26)) 8604 { 8605 struct ppc_branch_hash_entry *br_entry; 8606 8607 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table, 8608 stub_entry->root.string + 9, 8609 TRUE, FALSE); 8610 if (br_entry == NULL) 8611 { 8612 (*_bfd_error_handler) (_("can't build branch stub `%s'"), 8613 stub_entry->root.string); 8614 htab->stub_error = TRUE; 8615 return FALSE; 8616 } 8617 8618 if (br_entry->iter != htab->stub_iteration) 8619 { 8620 br_entry->iter = htab->stub_iteration; 8621 br_entry->offset = htab->brlt->size; 8622 htab->brlt->size += 8; 8623 8624 if (htab->relbrlt != NULL) 8625 htab->relbrlt->size += sizeof (Elf64_External_Rela); 8626 } 8627 8628 stub_entry->stub_type += ppc_stub_plt_branch - ppc_stub_long_branch; 8629 size = 16; 8630 if (stub_entry->stub_type != ppc_stub_plt_branch) 8631 size = 28; 8632 } 8633 8634 if (info->emitrelocations 8635 && (stub_entry->stub_type == ppc_stub_long_branch 8636 || stub_entry->stub_type == ppc_stub_long_branch_r2off)) 8637 stub_entry->stub_sec->reloc_count += 1; 8638 } 8639 8640 stub_entry->stub_sec->size += size; 8641 return TRUE; 8642} 8643 8644/* Set up various things so that we can make a list of input sections 8645 for each output section included in the link. Returns -1 on error, 8646 0 when no stubs will be needed, and 1 on success. */ 8647 8648int 8649ppc64_elf_setup_section_lists (bfd *output_bfd, 8650 struct bfd_link_info *info, 8651 int no_multi_toc) 8652{ 8653 bfd *input_bfd; 8654 int top_id, top_index, id; 8655 asection *section; 8656 asection **input_list; 8657 bfd_size_type amt; 8658 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8659 8660 htab->no_multi_toc = no_multi_toc; 8661 8662 if (htab->brlt == NULL) 8663 return 0; 8664 8665 /* Find the top input section id. */ 8666 for (input_bfd = info->input_bfds, top_id = 3; 8667 input_bfd != NULL; 8668 input_bfd = input_bfd->link_next) 8669 { 8670 for (section = input_bfd->sections; 8671 section != NULL; 8672 section = section->next) 8673 { 8674 if (top_id < section->id) 8675 top_id = section->id; 8676 } 8677 } 8678 8679 htab->top_id = top_id; 8680 amt = sizeof (struct map_stub) * (top_id + 1); 8681 htab->stub_group = bfd_zmalloc (amt); 8682 if (htab->stub_group == NULL) 8683 return -1; 8684 8685 /* Set toc_off for com, und, abs and ind sections. */ 8686 for (id = 0; id < 3; id++) 8687 htab->stub_group[id].toc_off = TOC_BASE_OFF; 8688 8689 elf_gp (output_bfd) = htab->toc_curr = ppc64_elf_toc (output_bfd); 8690 8691 /* We can't use output_bfd->section_count here to find the top output 8692 section index as some sections may have been removed, and 8693 strip_excluded_output_sections doesn't renumber the indices. */ 8694 for (section = output_bfd->sections, top_index = 0; 8695 section != NULL; 8696 section = section->next) 8697 { 8698 if (top_index < section->index) 8699 top_index = section->index; 8700 } 8701 8702 htab->top_index = top_index; 8703 amt = sizeof (asection *) * (top_index + 1); 8704 input_list = bfd_zmalloc (amt); 8705 htab->input_list = input_list; 8706 if (input_list == NULL) 8707 return -1; 8708 8709 return 1; 8710} 8711 8712/* The linker repeatedly calls this function for each TOC input section 8713 and linker generated GOT section. Group input bfds such that the toc 8714 within a group is less than 64k in size. Will break with cute linker 8715 scripts that play games with dot in the output toc section. */ 8716 8717void 8718ppc64_elf_next_toc_section (struct bfd_link_info *info, asection *isec) 8719{ 8720 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8721 8722 if (!htab->no_multi_toc) 8723 { 8724 bfd_vma addr = isec->output_offset + isec->output_section->vma; 8725 bfd_vma off = addr - htab->toc_curr; 8726 8727 if (off + isec->size > 0x10000) 8728 htab->toc_curr = addr; 8729 8730 elf_gp (isec->owner) = (htab->toc_curr 8731 - elf_gp (isec->output_section->owner) 8732 + TOC_BASE_OFF); 8733 } 8734} 8735 8736/* Called after the last call to the above function. */ 8737 8738void 8739ppc64_elf_reinit_toc (bfd *output_bfd, struct bfd_link_info *info) 8740{ 8741 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8742 8743 htab->multi_toc_needed = htab->toc_curr != elf_gp (output_bfd); 8744 8745 /* toc_curr tracks the TOC offset used for code sections below in 8746 ppc64_elf_next_input_section. Start off at 0x8000. */ 8747 htab->toc_curr = TOC_BASE_OFF; 8748} 8749 8750/* No toc references were found in ISEC. If the code in ISEC makes no 8751 calls, then there's no need to use toc adjusting stubs when branching 8752 into ISEC. Actually, indirect calls from ISEC are OK as they will 8753 load r2. Returns -1 on error, 0 for no stub needed, 1 for stub 8754 needed, and 2 if a cyclical call-graph was found but no other reason 8755 for a stub was detected. If called from the top level, a return of 8756 2 means the same as a return of 0. */ 8757 8758static int 8759toc_adjusting_stub_needed (struct bfd_link_info *info, asection *isec) 8760{ 8761 Elf_Internal_Rela *relstart, *rel; 8762 Elf_Internal_Sym *local_syms; 8763 int ret; 8764 struct ppc_link_hash_table *htab; 8765 8766 /* We know none of our code bearing sections will need toc stubs. */ 8767 if ((isec->flags & SEC_LINKER_CREATED) != 0) 8768 return 0; 8769 8770 if (isec->size == 0) 8771 return 0; 8772 8773 if (isec->output_section == NULL) 8774 return 0; 8775 8776 /* Hack for linux kernel. .fixup contains branches, but only back to 8777 the function that hit an exception. */ 8778 if (strcmp (isec->name, ".fixup") == 0) 8779 return 0; 8780 8781 if (isec->reloc_count == 0) 8782 return 0; 8783 8784 relstart = _bfd_elf_link_read_relocs (isec->owner, isec, NULL, NULL, 8785 info->keep_memory); 8786 if (relstart == NULL) 8787 return -1; 8788 8789 /* Look for branches to outside of this section. */ 8790 local_syms = NULL; 8791 ret = 0; 8792 htab = ppc_hash_table (info); 8793 for (rel = relstart; rel < relstart + isec->reloc_count; ++rel) 8794 { 8795 enum elf_ppc64_reloc_type r_type; 8796 unsigned long r_symndx; 8797 struct elf_link_hash_entry *h; 8798 Elf_Internal_Sym *sym; 8799 asection *sym_sec; 8800 long *opd_adjust; 8801 bfd_vma sym_value; 8802 bfd_vma dest; 8803 8804 r_type = ELF64_R_TYPE (rel->r_info); 8805 if (r_type != R_PPC64_REL24 8806 && r_type != R_PPC64_REL14 8807 && r_type != R_PPC64_REL14_BRTAKEN 8808 && r_type != R_PPC64_REL14_BRNTAKEN) 8809 continue; 8810 8811 r_symndx = ELF64_R_SYM (rel->r_info); 8812 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, r_symndx, 8813 isec->owner)) 8814 { 8815 ret = -1; 8816 break; 8817 } 8818 8819 /* Calls to dynamic lib functions go through a plt call stub 8820 that uses r2. Branches to undefined symbols might be a call 8821 using old-style dot symbols that can be satisfied by a plt 8822 call into a new-style dynamic library. */ 8823 if (sym_sec == NULL) 8824 { 8825 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) h; 8826 if (eh != NULL 8827 && eh->oh != NULL 8828 && eh->oh->elf.plt.plist != NULL) 8829 { 8830 ret = 1; 8831 break; 8832 } 8833 8834 /* Ignore other undefined symbols. */ 8835 continue; 8836 } 8837 8838 /* Assume branches to other sections not included in the link need 8839 stubs too, to cover -R and absolute syms. */ 8840 if (sym_sec->output_section == NULL) 8841 { 8842 ret = 1; 8843 break; 8844 } 8845 8846 if (h == NULL) 8847 sym_value = sym->st_value; 8848 else 8849 { 8850 if (h->root.type != bfd_link_hash_defined 8851 && h->root.type != bfd_link_hash_defweak) 8852 abort (); 8853 sym_value = h->root.u.def.value; 8854 } 8855 sym_value += rel->r_addend; 8856 8857 /* If this branch reloc uses an opd sym, find the code section. */ 8858 opd_adjust = get_opd_info (sym_sec); 8859 if (opd_adjust != NULL) 8860 { 8861 if (h == NULL) 8862 { 8863 long adjust; 8864 8865 adjust = opd_adjust[sym->st_value / 8]; 8866 if (adjust == -1) 8867 /* Assume deleted functions won't ever be called. */ 8868 continue; 8869 sym_value += adjust; 8870 } 8871 8872 dest = opd_entry_value (sym_sec, sym_value, &sym_sec, NULL); 8873 if (dest == (bfd_vma) -1) 8874 continue; 8875 } 8876 else 8877 dest = (sym_value 8878 + sym_sec->output_offset 8879 + sym_sec->output_section->vma); 8880 8881 /* Ignore branch to self. */ 8882 if (sym_sec == isec) 8883 continue; 8884 8885 /* If the called function uses the toc, we need a stub. */ 8886 if (sym_sec->has_toc_reloc 8887 || sym_sec->makes_toc_func_call) 8888 { 8889 ret = 1; 8890 break; 8891 } 8892 8893 /* Assume any branch that needs a long branch stub might in fact 8894 need a plt_branch stub. A plt_branch stub uses r2. */ 8895 else if (dest - (isec->output_offset 8896 + isec->output_section->vma 8897 + rel->r_offset) + (1 << 25) >= (2 << 25)) 8898 { 8899 ret = 1; 8900 break; 8901 } 8902 8903 /* If calling back to a section in the process of being tested, we 8904 can't say for sure that no toc adjusting stubs are needed, so 8905 don't return zero. */ 8906 else if (sym_sec->call_check_in_progress) 8907 ret = 2; 8908 8909 /* Branches to another section that itself doesn't have any TOC 8910 references are OK. Recursively call ourselves to check. */ 8911 else if (sym_sec->id <= htab->top_id 8912 && htab->stub_group[sym_sec->id].toc_off == 0) 8913 { 8914 int recur; 8915 8916 /* Mark current section as indeterminate, so that other 8917 sections that call back to current won't be marked as 8918 known. */ 8919 isec->call_check_in_progress = 1; 8920 recur = toc_adjusting_stub_needed (info, sym_sec); 8921 isec->call_check_in_progress = 0; 8922 8923 if (recur < 0) 8924 { 8925 /* An error. Exit. */ 8926 ret = -1; 8927 break; 8928 } 8929 else if (recur <= 1) 8930 { 8931 /* Known result. Mark as checked and set section flag. */ 8932 htab->stub_group[sym_sec->id].toc_off = 1; 8933 if (recur != 0) 8934 { 8935 sym_sec->makes_toc_func_call = 1; 8936 ret = 1; 8937 break; 8938 } 8939 } 8940 else 8941 { 8942 /* Unknown result. Continue checking. */ 8943 ret = 2; 8944 } 8945 } 8946 } 8947 8948 if (local_syms != NULL 8949 && (elf_tdata (isec->owner)->symtab_hdr.contents 8950 != (unsigned char *) local_syms)) 8951 free (local_syms); 8952 if (elf_section_data (isec)->relocs != relstart) 8953 free (relstart); 8954 8955 return ret; 8956} 8957 8958/* The linker repeatedly calls this function for each input section, 8959 in the order that input sections are linked into output sections. 8960 Build lists of input sections to determine groupings between which 8961 we may insert linker stubs. */ 8962 8963bfd_boolean 8964ppc64_elf_next_input_section (struct bfd_link_info *info, asection *isec) 8965{ 8966 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8967 8968 if ((isec->output_section->flags & SEC_CODE) != 0 8969 && isec->output_section->index <= htab->top_index) 8970 { 8971 asection **list = htab->input_list + isec->output_section->index; 8972 /* Steal the link_sec pointer for our list. */ 8973#define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec) 8974 /* This happens to make the list in reverse order, 8975 which is what we want. */ 8976 PREV_SEC (isec) = *list; 8977 *list = isec; 8978 } 8979 8980 if (htab->multi_toc_needed) 8981 { 8982 /* If a code section has a function that uses the TOC then we need 8983 to use the right TOC (obviously). Also, make sure that .opd gets 8984 the correct TOC value for R_PPC64_TOC relocs that don't have or 8985 can't find their function symbol (shouldn't ever happen now). */ 8986 if (isec->has_toc_reloc || (isec->flags & SEC_CODE) == 0) 8987 { 8988 if (elf_gp (isec->owner) != 0) 8989 htab->toc_curr = elf_gp (isec->owner); 8990 } 8991 else if (htab->stub_group[isec->id].toc_off == 0) 8992 { 8993 int ret = toc_adjusting_stub_needed (info, isec); 8994 if (ret < 0) 8995 return FALSE; 8996 else 8997 isec->makes_toc_func_call = ret & 1; 8998 } 8999 } 9000 9001 /* Functions that don't use the TOC can belong in any TOC group. 9002 Use the last TOC base. This happens to make _init and _fini 9003 pasting work. */ 9004 htab->stub_group[isec->id].toc_off = htab->toc_curr; 9005 return TRUE; 9006} 9007 9008/* See whether we can group stub sections together. Grouping stub 9009 sections may result in fewer stubs. More importantly, we need to 9010 put all .init* and .fini* stubs at the beginning of the .init or 9011 .fini output sections respectively, because glibc splits the 9012 _init and _fini functions into multiple parts. Putting a stub in 9013 the middle of a function is not a good idea. */ 9014 9015static void 9016group_sections (struct ppc_link_hash_table *htab, 9017 bfd_size_type stub_group_size, 9018 bfd_boolean stubs_always_before_branch) 9019{ 9020 asection **list; 9021 bfd_size_type stub14_group_size; 9022 bfd_boolean suppress_size_errors; 9023 9024 suppress_size_errors = FALSE; 9025 stub14_group_size = stub_group_size; 9026 if (stub_group_size == 1) 9027 { 9028 /* Default values. */ 9029 if (stubs_always_before_branch) 9030 { 9031 stub_group_size = 0x1e00000; 9032 stub14_group_size = 0x7800; 9033 } 9034 else 9035 { 9036 stub_group_size = 0x1c00000; 9037 stub14_group_size = 0x7000; 9038 } 9039 suppress_size_errors = TRUE; 9040 } 9041 9042 list = htab->input_list + htab->top_index; 9043 do 9044 { 9045 asection *tail = *list; 9046 while (tail != NULL) 9047 { 9048 asection *curr; 9049 asection *prev; 9050 bfd_size_type total; 9051 bfd_boolean big_sec; 9052 bfd_vma curr_toc; 9053 9054 curr = tail; 9055 total = tail->size; 9056 big_sec = total > (ppc64_elf_section_data (tail)->has_14bit_branch 9057 ? stub14_group_size : stub_group_size); 9058 if (big_sec && !suppress_size_errors) 9059 (*_bfd_error_handler) (_("%B section %A exceeds stub group size"), 9060 tail->owner, tail); 9061 curr_toc = htab->stub_group[tail->id].toc_off; 9062 9063 while ((prev = PREV_SEC (curr)) != NULL 9064 && ((total += curr->output_offset - prev->output_offset) 9065 < (ppc64_elf_section_data (prev)->has_14bit_branch 9066 ? stub14_group_size : stub_group_size)) 9067 && htab->stub_group[prev->id].toc_off == curr_toc) 9068 curr = prev; 9069 9070 /* OK, the size from the start of CURR to the end is less 9071 than stub_group_size and thus can be handled by one stub 9072 section. (or the tail section is itself larger than 9073 stub_group_size, in which case we may be toast.) We 9074 should really be keeping track of the total size of stubs 9075 added here, as stubs contribute to the final output 9076 section size. That's a little tricky, and this way will 9077 only break if stubs added make the total size more than 9078 2^25, ie. for the default stub_group_size, if stubs total 9079 more than 2097152 bytes, or nearly 75000 plt call stubs. */ 9080 do 9081 { 9082 prev = PREV_SEC (tail); 9083 /* Set up this stub group. */ 9084 htab->stub_group[tail->id].link_sec = curr; 9085 } 9086 while (tail != curr && (tail = prev) != NULL); 9087 9088 /* But wait, there's more! Input sections up to stub_group_size 9089 bytes before the stub section can be handled by it too. 9090 Don't do this if we have a really large section after the 9091 stubs, as adding more stubs increases the chance that 9092 branches may not reach into the stub section. */ 9093 if (!stubs_always_before_branch && !big_sec) 9094 { 9095 total = 0; 9096 while (prev != NULL 9097 && ((total += tail->output_offset - prev->output_offset) 9098 < (ppc64_elf_section_data (prev)->has_14bit_branch 9099 ? stub14_group_size : stub_group_size)) 9100 && htab->stub_group[prev->id].toc_off == curr_toc) 9101 { 9102 tail = prev; 9103 prev = PREV_SEC (tail); 9104 htab->stub_group[tail->id].link_sec = curr; 9105 } 9106 } 9107 tail = prev; 9108 } 9109 } 9110 while (list-- != htab->input_list); 9111 free (htab->input_list); 9112#undef PREV_SEC 9113} 9114 9115/* Determine and set the size of the stub section for a final link. 9116 9117 The basic idea here is to examine all the relocations looking for 9118 PC-relative calls to a target that is unreachable with a "bl" 9119 instruction. */ 9120 9121bfd_boolean 9122ppc64_elf_size_stubs (bfd *output_bfd, 9123 struct bfd_link_info *info, 9124 bfd_signed_vma group_size, 9125 asection *(*add_stub_section) (const char *, asection *), 9126 void (*layout_sections_again) (void)) 9127{ 9128 bfd_size_type stub_group_size; 9129 bfd_boolean stubs_always_before_branch; 9130 struct ppc_link_hash_table *htab = ppc_hash_table (info); 9131 9132 /* Stash our params away. */ 9133 htab->add_stub_section = add_stub_section; 9134 htab->layout_sections_again = layout_sections_again; 9135 stubs_always_before_branch = group_size < 0; 9136 if (group_size < 0) 9137 stub_group_size = -group_size; 9138 else 9139 stub_group_size = group_size; 9140 9141 group_sections (htab, stub_group_size, stubs_always_before_branch); 9142 9143 while (1) 9144 { 9145 bfd *input_bfd; 9146 unsigned int bfd_indx; 9147 asection *stub_sec; 9148 9149 htab->stub_iteration += 1; 9150 9151 for (input_bfd = info->input_bfds, bfd_indx = 0; 9152 input_bfd != NULL; 9153 input_bfd = input_bfd->link_next, bfd_indx++) 9154 { 9155 Elf_Internal_Shdr *symtab_hdr; 9156 asection *section; 9157 Elf_Internal_Sym *local_syms = NULL; 9158 9159 if (!is_ppc64_elf_target (input_bfd->xvec)) 9160 continue; 9161 9162 /* We'll need the symbol table in a second. */ 9163 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 9164 if (symtab_hdr->sh_info == 0) 9165 continue; 9166 9167 /* Walk over each section attached to the input bfd. */ 9168 for (section = input_bfd->sections; 9169 section != NULL; 9170 section = section->next) 9171 { 9172 Elf_Internal_Rela *internal_relocs, *irelaend, *irela; 9173 9174 /* If there aren't any relocs, then there's nothing more 9175 to do. */ 9176 if ((section->flags & SEC_RELOC) == 0 9177 || (section->flags & SEC_ALLOC) == 0 9178 || (section->flags & SEC_LOAD) == 0 9179 || (section->flags & SEC_CODE) == 0 9180 || section->reloc_count == 0) 9181 continue; 9182 9183 /* If this section is a link-once section that will be 9184 discarded, then don't create any stubs. */ 9185 if (section->output_section == NULL 9186 || section->output_section->owner != output_bfd) 9187 continue; 9188 9189 /* Get the relocs. */ 9190 internal_relocs 9191 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, 9192 info->keep_memory); 9193 if (internal_relocs == NULL) 9194 goto error_ret_free_local; 9195 9196 /* Now examine each relocation. */ 9197 irela = internal_relocs; 9198 irelaend = irela + section->reloc_count; 9199 for (; irela < irelaend; irela++) 9200 { 9201 enum elf_ppc64_reloc_type r_type; 9202 unsigned int r_indx; 9203 enum ppc_stub_type stub_type; 9204 struct ppc_stub_hash_entry *stub_entry; 9205 asection *sym_sec, *code_sec; 9206 bfd_vma sym_value; 9207 bfd_vma destination; 9208 bfd_boolean ok_dest; 9209 struct ppc_link_hash_entry *hash; 9210 struct ppc_link_hash_entry *fdh; 9211 struct elf_link_hash_entry *h; 9212 Elf_Internal_Sym *sym; 9213 char *stub_name; 9214 const asection *id_sec; 9215 long *opd_adjust; 9216 9217 r_type = ELF64_R_TYPE (irela->r_info); 9218 r_indx = ELF64_R_SYM (irela->r_info); 9219 9220 if (r_type >= R_PPC64_max) 9221 { 9222 bfd_set_error (bfd_error_bad_value); 9223 goto error_ret_free_internal; 9224 } 9225 9226 /* Only look for stubs on branch instructions. */ 9227 if (r_type != R_PPC64_REL24 9228 && r_type != R_PPC64_REL14 9229 && r_type != R_PPC64_REL14_BRTAKEN 9230 && r_type != R_PPC64_REL14_BRNTAKEN) 9231 continue; 9232 9233 /* Now determine the call target, its name, value, 9234 section. */ 9235 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 9236 r_indx, input_bfd)) 9237 goto error_ret_free_internal; 9238 hash = (struct ppc_link_hash_entry *) h; 9239 9240 ok_dest = FALSE; 9241 fdh = NULL; 9242 sym_value = 0; 9243 if (hash == NULL) 9244 { 9245 sym_value = sym->st_value; 9246 ok_dest = TRUE; 9247 } 9248 else if (hash->elf.root.type == bfd_link_hash_defined 9249 || hash->elf.root.type == bfd_link_hash_defweak) 9250 { 9251 sym_value = hash->elf.root.u.def.value; 9252 if (sym_sec->output_section != NULL) 9253 ok_dest = TRUE; 9254 } 9255 else if (hash->elf.root.type == bfd_link_hash_undefweak 9256 || hash->elf.root.type == bfd_link_hash_undefined) 9257 { 9258 /* Recognise an old ABI func code entry sym, and 9259 use the func descriptor sym instead if it is 9260 defined. */ 9261 if (hash->elf.root.root.string[0] == '.' 9262 && (fdh = get_fdh (hash, htab)) != NULL) 9263 { 9264 if (fdh->elf.root.type == bfd_link_hash_defined 9265 || fdh->elf.root.type == bfd_link_hash_defweak) 9266 { 9267 sym_sec = fdh->elf.root.u.def.section; 9268 sym_value = fdh->elf.root.u.def.value; 9269 if (sym_sec->output_section != NULL) 9270 ok_dest = TRUE; 9271 } 9272 else 9273 fdh = NULL; 9274 } 9275 } 9276 else 9277 { 9278 bfd_set_error (bfd_error_bad_value); 9279 goto error_ret_free_internal; 9280 } 9281 9282 destination = 0; 9283 if (ok_dest) 9284 { 9285 sym_value += irela->r_addend; 9286 destination = (sym_value 9287 + sym_sec->output_offset 9288 + sym_sec->output_section->vma); 9289 } 9290 9291 code_sec = sym_sec; 9292 opd_adjust = get_opd_info (sym_sec); 9293 if (opd_adjust != NULL) 9294 { 9295 bfd_vma dest; 9296 9297 if (hash == NULL) 9298 { 9299 long adjust = opd_adjust[sym_value / 8]; 9300 if (adjust == -1) 9301 continue; 9302 sym_value += adjust; 9303 } 9304 dest = opd_entry_value (sym_sec, sym_value, 9305 &code_sec, &sym_value); 9306 if (dest != (bfd_vma) -1) 9307 { 9308 destination = dest; 9309 if (fdh != NULL) 9310 { 9311 /* Fixup old ABI sym to point at code 9312 entry. */ 9313 hash->elf.root.type = bfd_link_hash_defweak; 9314 hash->elf.root.u.def.section = code_sec; 9315 hash->elf.root.u.def.value = sym_value; 9316 } 9317 } 9318 } 9319 9320 /* Determine what (if any) linker stub is needed. */ 9321 stub_type = ppc_type_of_stub (section, irela, &hash, 9322 destination); 9323 9324 if (stub_type != ppc_stub_plt_call) 9325 { 9326 /* Check whether we need a TOC adjusting stub. 9327 Since the linker pastes together pieces from 9328 different object files when creating the 9329 _init and _fini functions, it may be that a 9330 call to what looks like a local sym is in 9331 fact a call needing a TOC adjustment. */ 9332 if (code_sec != NULL 9333 && code_sec->output_section != NULL 9334 && (htab->stub_group[code_sec->id].toc_off 9335 != htab->stub_group[section->id].toc_off) 9336 && (code_sec->has_toc_reloc 9337 || code_sec->makes_toc_func_call)) 9338 stub_type = ppc_stub_long_branch_r2off; 9339 } 9340 9341 if (stub_type == ppc_stub_none) 9342 continue; 9343 9344 /* __tls_get_addr calls might be eliminated. */ 9345 if (stub_type != ppc_stub_plt_call 9346 && hash != NULL 9347 && (hash == htab->tls_get_addr 9348 || hash == htab->tls_get_addr_fd) 9349 && section->has_tls_reloc 9350 && irela != internal_relocs) 9351 { 9352 /* Get tls info. */ 9353 char *tls_mask; 9354 9355 if (!get_tls_mask (&tls_mask, NULL, &local_syms, 9356 irela - 1, input_bfd)) 9357 goto error_ret_free_internal; 9358 if (*tls_mask != 0) 9359 continue; 9360 } 9361 9362 /* Support for grouping stub sections. */ 9363 id_sec = htab->stub_group[section->id].link_sec; 9364 9365 /* Get the name of this stub. */ 9366 stub_name = ppc_stub_name (id_sec, sym_sec, hash, irela); 9367 if (!stub_name) 9368 goto error_ret_free_internal; 9369 9370 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, 9371 stub_name, FALSE, FALSE); 9372 if (stub_entry != NULL) 9373 { 9374 /* The proper stub has already been created. */ 9375 free (stub_name); 9376 continue; 9377 } 9378 9379 stub_entry = ppc_add_stub (stub_name, section, htab); 9380 if (stub_entry == NULL) 9381 { 9382 free (stub_name); 9383 error_ret_free_internal: 9384 if (elf_section_data (section)->relocs == NULL) 9385 free (internal_relocs); 9386 error_ret_free_local: 9387 if (local_syms != NULL 9388 && (symtab_hdr->contents 9389 != (unsigned char *) local_syms)) 9390 free (local_syms); 9391 return FALSE; 9392 } 9393 9394 stub_entry->stub_type = stub_type; 9395 stub_entry->target_value = sym_value; 9396 stub_entry->target_section = code_sec; 9397 stub_entry->h = hash; 9398 stub_entry->addend = irela->r_addend; 9399 9400 if (stub_entry->h != NULL) 9401 htab->stub_globals += 1; 9402 } 9403 9404 /* We're done with the internal relocs, free them. */ 9405 if (elf_section_data (section)->relocs != internal_relocs) 9406 free (internal_relocs); 9407 } 9408 9409 if (local_syms != NULL 9410 && symtab_hdr->contents != (unsigned char *) local_syms) 9411 { 9412 if (!info->keep_memory) 9413 free (local_syms); 9414 else 9415 symtab_hdr->contents = (unsigned char *) local_syms; 9416 } 9417 } 9418 9419 /* We may have added some stubs. Find out the new size of the 9420 stub sections. */ 9421 for (stub_sec = htab->stub_bfd->sections; 9422 stub_sec != NULL; 9423 stub_sec = stub_sec->next) 9424 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 9425 { 9426 stub_sec->rawsize = stub_sec->size; 9427 stub_sec->size = 0; 9428 stub_sec->reloc_count = 0; 9429 } 9430 9431 htab->brlt->size = 0; 9432 if (htab->relbrlt != NULL) 9433 htab->relbrlt->size = 0; 9434 9435 bfd_hash_traverse (&htab->stub_hash_table, ppc_size_one_stub, info); 9436 9437 for (stub_sec = htab->stub_bfd->sections; 9438 stub_sec != NULL; 9439 stub_sec = stub_sec->next) 9440 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0 9441 && stub_sec->rawsize != stub_sec->size) 9442 break; 9443 9444 /* Exit from this loop when no stubs have been added, and no stubs 9445 have changed size. */ 9446 if (stub_sec == NULL) 9447 break; 9448 9449 /* Ask the linker to do its stuff. */ 9450 (*htab->layout_sections_again) (); 9451 } 9452 9453 /* It would be nice to strip htab->brlt from the output if the 9454 section is empty, but it's too late. If we strip sections here, 9455 the dynamic symbol table is corrupted since the section symbol 9456 for the stripped section isn't written. */ 9457 9458 return TRUE; 9459} 9460 9461/* Called after we have determined section placement. If sections 9462 move, we'll be called again. Provide a value for TOCstart. */ 9463 9464bfd_vma 9465ppc64_elf_toc (bfd *obfd) 9466{ 9467 asection *s; 9468 bfd_vma TOCstart; 9469 9470 /* The TOC consists of sections .got, .toc, .tocbss, .plt in that 9471 order. The TOC starts where the first of these sections starts. */ 9472 s = bfd_get_section_by_name (obfd, ".got"); 9473 if (s == NULL) 9474 s = bfd_get_section_by_name (obfd, ".toc"); 9475 if (s == NULL) 9476 s = bfd_get_section_by_name (obfd, ".tocbss"); 9477 if (s == NULL) 9478 s = bfd_get_section_by_name (obfd, ".plt"); 9479 if (s == NULL) 9480 { 9481 /* This may happen for 9482 o references to TOC base (SYM@toc / TOC[tc0]) without a 9483 .toc directive 9484 o bad linker script 9485 o --gc-sections and empty TOC sections 9486 9487 FIXME: Warn user? */ 9488 9489 /* Look for a likely section. We probably won't even be 9490 using TOCstart. */ 9491 for (s = obfd->sections; s != NULL; s = s->next) 9492 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA | SEC_READONLY)) 9493 == (SEC_ALLOC | SEC_SMALL_DATA)) 9494 break; 9495 if (s == NULL) 9496 for (s = obfd->sections; s != NULL; s = s->next) 9497 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA)) 9498 == (SEC_ALLOC | SEC_SMALL_DATA)) 9499 break; 9500 if (s == NULL) 9501 for (s = obfd->sections; s != NULL; s = s->next) 9502 if ((s->flags & (SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC) 9503 break; 9504 if (s == NULL) 9505 for (s = obfd->sections; s != NULL; s = s->next) 9506 if ((s->flags & SEC_ALLOC) == SEC_ALLOC) 9507 break; 9508 } 9509 9510 TOCstart = 0; 9511 if (s != NULL) 9512 TOCstart = s->output_section->vma + s->output_offset; 9513 9514 return TOCstart; 9515} 9516 9517/* Build all the stubs associated with the current output file. 9518 The stubs are kept in a hash table attached to the main linker 9519 hash table. This function is called via gldelf64ppc_finish. */ 9520 9521bfd_boolean 9522ppc64_elf_build_stubs (bfd_boolean emit_stub_syms, 9523 struct bfd_link_info *info, 9524 char **stats) 9525{ 9526 struct ppc_link_hash_table *htab = ppc_hash_table (info); 9527 asection *stub_sec; 9528 bfd_byte *p; 9529 int stub_sec_count = 0; 9530 9531 htab->emit_stub_syms = emit_stub_syms; 9532 9533 /* Allocate memory to hold the linker stubs. */ 9534 for (stub_sec = htab->stub_bfd->sections; 9535 stub_sec != NULL; 9536 stub_sec = stub_sec->next) 9537 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0 9538 && stub_sec->size != 0) 9539 { 9540 stub_sec->contents = bfd_zalloc (htab->stub_bfd, stub_sec->size); 9541 if (stub_sec->contents == NULL) 9542 return FALSE; 9543 /* We want to check that built size is the same as calculated 9544 size. rawsize is a convenient location to use. */ 9545 stub_sec->rawsize = stub_sec->size; 9546 stub_sec->size = 0; 9547 } 9548 9549 if (htab->glink != NULL && htab->glink->size != 0) 9550 { 9551 unsigned int indx; 9552 bfd_vma plt0; 9553 9554 /* Build the .glink plt call stub. */ 9555 if (htab->emit_stub_syms) 9556 { 9557 struct elf_link_hash_entry *h; 9558 h = elf_link_hash_lookup (&htab->elf, "__glink", TRUE, FALSE, FALSE); 9559 if (h == NULL) 9560 return FALSE; 9561 if (h->root.type == bfd_link_hash_new) 9562 { 9563 h->root.type = bfd_link_hash_defined; 9564 h->root.u.def.section = htab->glink; 9565 h->root.u.def.value = 8; 9566 h->ref_regular = 1; 9567 h->def_regular = 1; 9568 h->ref_regular_nonweak = 1; 9569 h->forced_local = 1; 9570 h->non_elf = 0; 9571 } 9572 } 9573 p = htab->glink->contents; 9574 plt0 = (htab->plt->output_section->vma 9575 + htab->plt->output_offset 9576 - (htab->glink->output_section->vma 9577 + htab->glink->output_offset 9578 + 16)); 9579 bfd_put_64 (htab->glink->owner, plt0, p); 9580 p += 8; 9581 bfd_put_32 (htab->glink->owner, MFLR_R12, p); 9582 p += 4; 9583 bfd_put_32 (htab->glink->owner, BCL_20_31, p); 9584 p += 4; 9585 bfd_put_32 (htab->glink->owner, MFLR_R11, p); 9586 p += 4; 9587 bfd_put_32 (htab->glink->owner, LD_R2_M16R11, p); 9588 p += 4; 9589 bfd_put_32 (htab->glink->owner, MTLR_R12, p); 9590 p += 4; 9591 bfd_put_32 (htab->glink->owner, ADD_R12_R2_R11, p); 9592 p += 4; 9593 bfd_put_32 (htab->glink->owner, LD_R11_0R12, p); 9594 p += 4; 9595 bfd_put_32 (htab->glink->owner, LD_R2_0R12 | 8, p); 9596 p += 4; 9597 bfd_put_32 (htab->glink->owner, MTCTR_R11, p); 9598 p += 4; 9599 bfd_put_32 (htab->glink->owner, LD_R11_0R12 | 16, p); 9600 p += 4; 9601 bfd_put_32 (htab->glink->owner, BCTR, p); 9602 p += 4; 9603 while (p - htab->glink->contents < GLINK_CALL_STUB_SIZE) 9604 { 9605 bfd_put_32 (htab->glink->owner, NOP, p); 9606 p += 4; 9607 } 9608 9609 /* Build the .glink lazy link call stubs. */ 9610 indx = 0; 9611 while (p < htab->glink->contents + htab->glink->size) 9612 { 9613 if (indx < 0x8000) 9614 { 9615 bfd_put_32 (htab->glink->owner, LI_R0_0 | indx, p); 9616 p += 4; 9617 } 9618 else 9619 { 9620 bfd_put_32 (htab->glink->owner, LIS_R0_0 | PPC_HI (indx), p); 9621 p += 4; 9622 bfd_put_32 (htab->glink->owner, ORI_R0_R0_0 | PPC_LO (indx), p); 9623 p += 4; 9624 } 9625 bfd_put_32 (htab->glink->owner, 9626 B_DOT | ((htab->glink->contents - p + 8) & 0x3fffffc), p); 9627 indx++; 9628 p += 4; 9629 } 9630 htab->glink->rawsize = p - htab->glink->contents; 9631 } 9632 9633 if (htab->brlt->size != 0) 9634 { 9635 htab->brlt->contents = bfd_zalloc (htab->brlt->owner, 9636 htab->brlt->size); 9637 if (htab->brlt->contents == NULL) 9638 return FALSE; 9639 } 9640 if (htab->relbrlt != NULL && htab->relbrlt->size != 0) 9641 { 9642 htab->relbrlt->contents = bfd_zalloc (htab->relbrlt->owner, 9643 htab->relbrlt->size); 9644 if (htab->relbrlt->contents == NULL) 9645 return FALSE; 9646 } 9647 9648 /* Build the stubs as directed by the stub hash table. */ 9649 bfd_hash_traverse (&htab->stub_hash_table, ppc_build_one_stub, info); 9650 9651 if (htab->relbrlt != NULL) 9652 htab->relbrlt->reloc_count = 0; 9653 9654 for (stub_sec = htab->stub_bfd->sections; 9655 stub_sec != NULL; 9656 stub_sec = stub_sec->next) 9657 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 9658 { 9659 stub_sec_count += 1; 9660 if (stub_sec->rawsize != stub_sec->size) 9661 break; 9662 } 9663 9664 if (stub_sec != NULL 9665 || htab->glink->rawsize != htab->glink->size) 9666 { 9667 htab->stub_error = TRUE; 9668 (*_bfd_error_handler) (_("stubs don't match calculated size")); 9669 } 9670 9671 if (htab->stub_error) 9672 return FALSE; 9673 9674 if (stats != NULL) 9675 { 9676 *stats = bfd_malloc (500); 9677 if (*stats == NULL) 9678 return FALSE; 9679 9680 sprintf (*stats, _("linker stubs in %u group%s\n" 9681 " branch %lu\n" 9682 " toc adjust %lu\n" 9683 " long branch %lu\n" 9684 " long toc adj %lu\n" 9685 " plt call %lu"), 9686 stub_sec_count, 9687 stub_sec_count == 1 ? "" : "s", 9688 htab->stub_count[ppc_stub_long_branch - 1], 9689 htab->stub_count[ppc_stub_long_branch_r2off - 1], 9690 htab->stub_count[ppc_stub_plt_branch - 1], 9691 htab->stub_count[ppc_stub_plt_branch_r2off - 1], 9692 htab->stub_count[ppc_stub_plt_call - 1]); 9693 } 9694 return TRUE; 9695} 9696 9697/* This function undoes the changes made by add_symbol_adjust. */ 9698 9699static bfd_boolean 9700undo_symbol_twiddle (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED) 9701{ 9702 struct ppc_link_hash_entry *eh; 9703 9704 if (h->root.type == bfd_link_hash_indirect) 9705 return TRUE; 9706 9707 if (h->root.type == bfd_link_hash_warning) 9708 h = (struct elf_link_hash_entry *) h->root.u.i.link; 9709 9710 eh = (struct ppc_link_hash_entry *) h; 9711 if (eh->elf.root.type != bfd_link_hash_undefweak || !eh->was_undefined) 9712 return TRUE; 9713 9714 eh->elf.root.type = bfd_link_hash_undefined; 9715 return TRUE; 9716} 9717 9718void 9719ppc64_elf_restore_symbols (struct bfd_link_info *info) 9720{ 9721 struct ppc_link_hash_table *htab = ppc_hash_table (info); 9722 elf_link_hash_traverse (&htab->elf, undo_symbol_twiddle, info); 9723} 9724 9725/* What to do when ld finds relocations against symbols defined in 9726 discarded sections. */ 9727 9728static unsigned int 9729ppc64_elf_action_discarded (asection *sec) 9730{ 9731 if (strcmp (".opd", sec->name) == 0) 9732 return 0; 9733 9734 if (strcmp (".toc", sec->name) == 0) 9735 return 0; 9736 9737 if (strcmp (".toc1", sec->name) == 0) 9738 return 0; 9739 9740 return _bfd_elf_default_action_discarded (sec); 9741} 9742 9743/* The RELOCATE_SECTION function is called by the ELF backend linker 9744 to handle the relocations for a section. 9745 9746 The relocs are always passed as Rela structures; if the section 9747 actually uses Rel structures, the r_addend field will always be 9748 zero. 9749 9750 This function is responsible for adjust the section contents as 9751 necessary, and (if using Rela relocs and generating a 9752 relocatable output file) adjusting the reloc addend as 9753 necessary. 9754 9755 This function does not have to worry about setting the reloc 9756 address or the reloc symbol index. 9757 9758 LOCAL_SYMS is a pointer to the swapped in local symbols. 9759 9760 LOCAL_SECTIONS is an array giving the section in the input file 9761 corresponding to the st_shndx field of each local symbol. 9762 9763 The global hash table entry for the global symbols can be found 9764 via elf_sym_hashes (input_bfd). 9765 9766 When generating relocatable output, this function must handle 9767 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 9768 going to be the section symbol corresponding to the output 9769 section, which means that the addend must be adjusted 9770 accordingly. */ 9771 9772static bfd_boolean 9773ppc64_elf_relocate_section (bfd *output_bfd, 9774 struct bfd_link_info *info, 9775 bfd *input_bfd, 9776 asection *input_section, 9777 bfd_byte *contents, 9778 Elf_Internal_Rela *relocs, 9779 Elf_Internal_Sym *local_syms, 9780 asection **local_sections) 9781{ 9782 struct ppc_link_hash_table *htab; 9783 Elf_Internal_Shdr *symtab_hdr; 9784 struct elf_link_hash_entry **sym_hashes; 9785 Elf_Internal_Rela *rel; 9786 Elf_Internal_Rela *relend; 9787 Elf_Internal_Rela outrel; 9788 bfd_byte *loc; 9789 struct got_entry **local_got_ents; 9790 bfd_vma TOCstart; 9791 bfd_boolean ret = TRUE; 9792 bfd_boolean is_opd; 9793 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */ 9794 bfd_boolean is_power4 = FALSE; 9795 bfd_vma d_offset = (bfd_big_endian (output_bfd) ? 2 : 0); 9796 9797 /* Initialize howto table if needed. */ 9798 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 9799 ppc_howto_init (); 9800 9801 htab = ppc_hash_table (info); 9802 9803 /* Don't relocate stub sections. */ 9804 if (input_section->owner == htab->stub_bfd) 9805 return TRUE; 9806 9807 local_got_ents = elf_local_got_ents (input_bfd); 9808 TOCstart = elf_gp (output_bfd); 9809 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 9810 sym_hashes = elf_sym_hashes (input_bfd); 9811 is_opd = ppc64_elf_section_data (input_section)->sec_type == sec_opd; 9812 9813 rel = relocs; 9814 relend = relocs + input_section->reloc_count; 9815 for (; rel < relend; rel++) 9816 { 9817 enum elf_ppc64_reloc_type r_type; 9818 bfd_vma addend, orig_addend; 9819 bfd_reloc_status_type r; 9820 Elf_Internal_Sym *sym; 9821 asection *sec; 9822 struct elf_link_hash_entry *h_elf; 9823 struct ppc_link_hash_entry *h; 9824 struct ppc_link_hash_entry *fdh; 9825 const char *sym_name; 9826 unsigned long r_symndx, toc_symndx; 9827 char tls_mask, tls_gd, tls_type; 9828 char sym_type; 9829 bfd_vma relocation; 9830 bfd_boolean unresolved_reloc; 9831 bfd_boolean warned; 9832 unsigned long insn, mask; 9833 struct ppc_stub_hash_entry *stub_entry; 9834 bfd_vma max_br_offset; 9835 bfd_vma from; 9836 9837 r_type = ELF64_R_TYPE (rel->r_info); 9838 r_symndx = ELF64_R_SYM (rel->r_info); 9839 9840 /* For old style R_PPC64_TOC relocs with a zero symbol, use the 9841 symbol of the previous ADDR64 reloc. The symbol gives us the 9842 proper TOC base to use. */ 9843 if (rel->r_info == ELF64_R_INFO (0, R_PPC64_TOC) 9844 && rel != relocs 9845 && ELF64_R_TYPE (rel[-1].r_info) == R_PPC64_ADDR64 9846 && is_opd) 9847 r_symndx = ELF64_R_SYM (rel[-1].r_info); 9848 9849 sym = NULL; 9850 sec = NULL; 9851 h_elf = NULL; 9852 sym_name = NULL; 9853 unresolved_reloc = FALSE; 9854 warned = FALSE; 9855 orig_addend = rel->r_addend; 9856 9857 if (r_symndx < symtab_hdr->sh_info) 9858 { 9859 /* It's a local symbol. */ 9860 long *opd_adjust; 9861 9862 sym = local_syms + r_symndx; 9863 sec = local_sections[r_symndx]; 9864 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, sec); 9865 sym_type = ELF64_ST_TYPE (sym->st_info); 9866 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 9867 opd_adjust = get_opd_info (sec); 9868 if (opd_adjust != NULL) 9869 { 9870 long adjust = opd_adjust[(sym->st_value + rel->r_addend) / 8]; 9871 if (adjust == -1) 9872 relocation = 0; 9873 else 9874 { 9875 /* If this is a relocation against the opd section sym 9876 and we have edited .opd, adjust the reloc addend so 9877 that ld -r and ld --emit-relocs output is correct. 9878 If it is a reloc against some other .opd symbol, 9879 then the symbol value will be adjusted later. */ 9880 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) 9881 rel->r_addend += adjust; 9882 else 9883 relocation += adjust; 9884 } 9885 } 9886 if (info->relocatable) 9887 continue; 9888 } 9889 else 9890 { 9891 if (info->relocatable) 9892 continue; 9893 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 9894 r_symndx, symtab_hdr, sym_hashes, 9895 h_elf, sec, relocation, 9896 unresolved_reloc, warned); 9897 sym_name = h_elf->root.root.string; 9898 sym_type = h_elf->type; 9899 } 9900 h = (struct ppc_link_hash_entry *) h_elf; 9901 9902 /* TLS optimizations. Replace instruction sequences and relocs 9903 based on information we collected in tls_optimize. We edit 9904 RELOCS so that --emit-relocs will output something sensible 9905 for the final instruction stream. */ 9906 tls_mask = 0; 9907 tls_gd = 0; 9908 toc_symndx = 0; 9909 if (IS_PPC64_TLS_RELOC (r_type)) 9910 { 9911 if (h != NULL) 9912 tls_mask = h->tls_mask; 9913 else if (local_got_ents != NULL) 9914 { 9915 char *lgot_masks; 9916 lgot_masks = (char *) (local_got_ents + symtab_hdr->sh_info); 9917 tls_mask = lgot_masks[r_symndx]; 9918 } 9919 if (tls_mask == 0 && r_type == R_PPC64_TLS) 9920 { 9921 /* Check for toc tls entries. */ 9922 char *toc_tls; 9923 9924 if (!get_tls_mask (&toc_tls, &toc_symndx, &local_syms, 9925 rel, input_bfd)) 9926 return FALSE; 9927 9928 if (toc_tls) 9929 tls_mask = *toc_tls; 9930 } 9931 } 9932 9933 /* Check that tls relocs are used with tls syms, and non-tls 9934 relocs are used with non-tls syms. */ 9935 if (r_symndx != 0 9936 && r_type != R_PPC64_NONE 9937 && (h == NULL 9938 || h->elf.root.type == bfd_link_hash_defined 9939 || h->elf.root.type == bfd_link_hash_defweak) 9940 && IS_PPC64_TLS_RELOC (r_type) != (sym_type == STT_TLS)) 9941 { 9942 if (r_type == R_PPC64_TLS && tls_mask != 0) 9943 /* R_PPC64_TLS is OK against a symbol in the TOC. */ 9944 ; 9945 else 9946 (*_bfd_error_handler) 9947 (sym_type == STT_TLS 9948 ? _("%B(%A+0x%lx): %s used with TLS symbol %s") 9949 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s"), 9950 input_bfd, 9951 input_section, 9952 (long) rel->r_offset, 9953 ppc64_elf_howto_table[r_type]->name, 9954 sym_name); 9955 } 9956 9957 /* Ensure reloc mapping code below stays sane. */ 9958 if (R_PPC64_TOC16_LO_DS != R_PPC64_TOC16_DS + 1 9959 || R_PPC64_TOC16_LO != R_PPC64_TOC16 + 1 9960 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TLSGD16 & 3) 9961 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TLSGD16_LO & 3) 9962 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TLSGD16_HI & 3) 9963 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TLSGD16_HA & 3) 9964 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TPREL16_DS & 3) 9965 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TPREL16_LO_DS & 3) 9966 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TPREL16_HI & 3) 9967 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TPREL16_HA & 3)) 9968 abort (); 9969 9970 switch (r_type) 9971 { 9972 default: 9973 break; 9974 9975 case R_PPC64_TOC16: 9976 case R_PPC64_TOC16_LO: 9977 case R_PPC64_TOC16_DS: 9978 case R_PPC64_TOC16_LO_DS: 9979 { 9980 /* Check for toc tls entries. */ 9981 char *toc_tls; 9982 int retval; 9983 9984 retval = get_tls_mask (&toc_tls, &toc_symndx, &local_syms, 9985 rel, input_bfd); 9986 if (retval == 0) 9987 return FALSE; 9988 9989 if (toc_tls) 9990 { 9991 tls_mask = *toc_tls; 9992 if (r_type == R_PPC64_TOC16_DS 9993 || r_type == R_PPC64_TOC16_LO_DS) 9994 { 9995 if (tls_mask != 0 9996 && (tls_mask & (TLS_DTPREL | TLS_TPREL)) == 0) 9997 goto toctprel; 9998 } 9999 else 10000 { 10001 /* If we found a GD reloc pair, then we might be 10002 doing a GD->IE transition. */ 10003 if (retval == 2) 10004 { 10005 tls_gd = TLS_TPRELGD; 10006 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 10007 goto tls_get_addr_check; 10008 } 10009 else if (retval == 3) 10010 { 10011 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 10012 goto tls_get_addr_check; 10013 } 10014 } 10015 } 10016 } 10017 break; 10018 10019 case R_PPC64_GOT_TPREL16_DS: 10020 case R_PPC64_GOT_TPREL16_LO_DS: 10021 if (tls_mask != 0 10022 && (tls_mask & TLS_TPREL) == 0) 10023 { 10024 toctprel: 10025 insn = bfd_get_32 (output_bfd, contents + rel->r_offset - d_offset); 10026 insn &= 31 << 21; 10027 insn |= 0x3c0d0000; /* addis 0,13,0 */ 10028 bfd_put_32 (output_bfd, insn, contents + rel->r_offset - d_offset); 10029 r_type = R_PPC64_TPREL16_HA; 10030 if (toc_symndx != 0) 10031 { 10032 rel->r_info = ELF64_R_INFO (toc_symndx, r_type); 10033 /* We changed the symbol. Start over in order to 10034 get h, sym, sec etc. right. */ 10035 rel--; 10036 continue; 10037 } 10038 else 10039 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10040 } 10041 break; 10042 10043 case R_PPC64_TLS: 10044 if (tls_mask != 0 10045 && (tls_mask & TLS_TPREL) == 0) 10046 { 10047 bfd_vma rtra; 10048 insn = bfd_get_32 (output_bfd, contents + rel->r_offset); 10049 if ((insn & ((0x3f << 26) | (31 << 11))) 10050 == ((31 << 26) | (13 << 11))) 10051 rtra = insn & ((1 << 26) - (1 << 16)); 10052 else if ((insn & ((0x3f << 26) | (31 << 16))) 10053 == ((31 << 26) | (13 << 16))) 10054 rtra = (insn & (31 << 21)) | ((insn & (31 << 11)) << 5); 10055 else 10056 abort (); 10057 if ((insn & ((1 << 11) - (1 << 1))) == 266 << 1) 10058 /* add -> addi. */ 10059 insn = 14 << 26; 10060 else if ((insn & (31 << 1)) == 23 << 1 10061 && ((insn & (31 << 6)) < 14 << 6 10062 || ((insn & (31 << 6)) >= 16 << 6 10063 && (insn & (31 << 6)) < 24 << 6))) 10064 /* load and store indexed -> dform. */ 10065 insn = (32 | ((insn >> 6) & 31)) << 26; 10066 else if ((insn & (31 << 1)) == 21 << 1 10067 && (insn & (0x1a << 6)) == 0) 10068 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */ 10069 insn = (((58 | ((insn >> 6) & 4)) << 26) 10070 | ((insn >> 6) & 1)); 10071 else if ((insn & (31 << 1)) == 21 << 1 10072 && (insn & ((1 << 11) - (1 << 1))) == 341 << 1) 10073 /* lwax -> lwa. */ 10074 insn = (58 << 26) | 2; 10075 else 10076 abort (); 10077 insn |= rtra; 10078 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 10079 /* Was PPC64_TLS which sits on insn boundary, now 10080 PPC64_TPREL16_LO which is at low-order half-word. */ 10081 rel->r_offset += d_offset; 10082 r_type = R_PPC64_TPREL16_LO; 10083 if (toc_symndx != 0) 10084 { 10085 rel->r_info = ELF64_R_INFO (toc_symndx, r_type); 10086 /* We changed the symbol. Start over in order to 10087 get h, sym, sec etc. right. */ 10088 rel--; 10089 continue; 10090 } 10091 else 10092 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10093 } 10094 break; 10095 10096 case R_PPC64_GOT_TLSGD16_HI: 10097 case R_PPC64_GOT_TLSGD16_HA: 10098 tls_gd = TLS_TPRELGD; 10099 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 10100 goto tls_gdld_hi; 10101 break; 10102 10103 case R_PPC64_GOT_TLSLD16_HI: 10104 case R_PPC64_GOT_TLSLD16_HA: 10105 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 10106 { 10107 tls_gdld_hi: 10108 if ((tls_mask & tls_gd) != 0) 10109 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3) 10110 + R_PPC64_GOT_TPREL16_DS); 10111 else 10112 { 10113 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset); 10114 rel->r_offset -= d_offset; 10115 r_type = R_PPC64_NONE; 10116 } 10117 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10118 } 10119 break; 10120 10121 case R_PPC64_GOT_TLSGD16: 10122 case R_PPC64_GOT_TLSGD16_LO: 10123 tls_gd = TLS_TPRELGD; 10124 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 10125 goto tls_get_addr_check; 10126 break; 10127 10128 case R_PPC64_GOT_TLSLD16: 10129 case R_PPC64_GOT_TLSLD16_LO: 10130 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 10131 { 10132 tls_get_addr_check: 10133 if (rel + 1 < relend) 10134 { 10135 enum elf_ppc64_reloc_type r_type2; 10136 unsigned long r_symndx2; 10137 struct elf_link_hash_entry *h2; 10138 bfd_vma insn1, insn2, insn3; 10139 bfd_vma offset; 10140 10141 /* The next instruction should be a call to 10142 __tls_get_addr. Peek at the reloc to be sure. */ 10143 r_type2 = ELF64_R_TYPE (rel[1].r_info); 10144 r_symndx2 = ELF64_R_SYM (rel[1].r_info); 10145 if (r_symndx2 < symtab_hdr->sh_info 10146 || (r_type2 != R_PPC64_REL14 10147 && r_type2 != R_PPC64_REL14_BRTAKEN 10148 && r_type2 != R_PPC64_REL14_BRNTAKEN 10149 && r_type2 != R_PPC64_REL24)) 10150 break; 10151 10152 h2 = sym_hashes[r_symndx2 - symtab_hdr->sh_info]; 10153 while (h2->root.type == bfd_link_hash_indirect 10154 || h2->root.type == bfd_link_hash_warning) 10155 h2 = (struct elf_link_hash_entry *) h2->root.u.i.link; 10156 if (h2 == NULL || (h2 != &htab->tls_get_addr->elf 10157 && h2 != &htab->tls_get_addr_fd->elf)) 10158 break; 10159 10160 /* OK, it checks out. Replace the call. */ 10161 offset = rel[1].r_offset; 10162 insn1 = bfd_get_32 (output_bfd, 10163 contents + rel->r_offset - d_offset); 10164 insn3 = bfd_get_32 (output_bfd, 10165 contents + offset + 4); 10166 if ((tls_mask & tls_gd) != 0) 10167 { 10168 /* IE */ 10169 insn1 &= (1 << 26) - (1 << 2); 10170 insn1 |= 58 << 26; /* ld */ 10171 insn2 = 0x7c636a14; /* add 3,3,13 */ 10172 rel[1].r_info = ELF64_R_INFO (r_symndx2, R_PPC64_NONE); 10173 if ((tls_mask & TLS_EXPLICIT) == 0) 10174 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3) 10175 + R_PPC64_GOT_TPREL16_DS); 10176 else 10177 r_type += R_PPC64_TOC16_DS - R_PPC64_TOC16; 10178 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10179 } 10180 else 10181 { 10182 /* LE */ 10183 insn1 = 0x3c6d0000; /* addis 3,13,0 */ 10184 insn2 = 0x38630000; /* addi 3,3,0 */ 10185 if (tls_gd == 0) 10186 { 10187 /* Was an LD reloc. */ 10188 r_symndx = 0; 10189 rel->r_addend = htab->elf.tls_sec->vma + DTP_OFFSET; 10190 rel[1].r_addend = htab->elf.tls_sec->vma + DTP_OFFSET; 10191 } 10192 else if (toc_symndx != 0) 10193 r_symndx = toc_symndx; 10194 r_type = R_PPC64_TPREL16_HA; 10195 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10196 rel[1].r_info = ELF64_R_INFO (r_symndx, 10197 R_PPC64_TPREL16_LO); 10198 rel[1].r_offset += d_offset; 10199 } 10200 if (insn3 == NOP 10201 || insn3 == CROR_151515 || insn3 == CROR_313131) 10202 { 10203 insn3 = insn2; 10204 insn2 = NOP; 10205 rel[1].r_offset += 4; 10206 } 10207 bfd_put_32 (output_bfd, insn1, contents + rel->r_offset - d_offset); 10208 bfd_put_32 (output_bfd, insn2, contents + offset); 10209 bfd_put_32 (output_bfd, insn3, contents + offset + 4); 10210 if (tls_gd == 0 || toc_symndx != 0) 10211 { 10212 /* We changed the symbol. Start over in order 10213 to get h, sym, sec etc. right. */ 10214 rel--; 10215 continue; 10216 } 10217 } 10218 } 10219 break; 10220 10221 case R_PPC64_DTPMOD64: 10222 if (rel + 1 < relend 10223 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64) 10224 && rel[1].r_offset == rel->r_offset + 8) 10225 { 10226 if ((tls_mask & TLS_GD) == 0) 10227 { 10228 rel[1].r_info = ELF64_R_INFO (r_symndx, R_PPC64_NONE); 10229 if ((tls_mask & TLS_TPRELGD) != 0) 10230 r_type = R_PPC64_TPREL64; 10231 else 10232 { 10233 bfd_put_64 (output_bfd, 1, contents + rel->r_offset); 10234 r_type = R_PPC64_NONE; 10235 } 10236 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10237 } 10238 } 10239 else 10240 { 10241 if ((tls_mask & TLS_LD) == 0) 10242 { 10243 bfd_put_64 (output_bfd, 1, contents + rel->r_offset); 10244 r_type = R_PPC64_NONE; 10245 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10246 } 10247 } 10248 break; 10249 10250 case R_PPC64_TPREL64: 10251 if ((tls_mask & TLS_TPREL) == 0) 10252 { 10253 r_type = R_PPC64_NONE; 10254 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10255 } 10256 break; 10257 } 10258 10259 /* Handle other relocations that tweak non-addend part of insn. */ 10260 insn = 0; 10261 max_br_offset = 1 << 25; 10262 addend = rel->r_addend; 10263 switch (r_type) 10264 { 10265 default: 10266 break; 10267 10268 /* Branch taken prediction relocations. */ 10269 case R_PPC64_ADDR14_BRTAKEN: 10270 case R_PPC64_REL14_BRTAKEN: 10271 insn = 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */ 10272 /* Fall thru. */ 10273 10274 /* Branch not taken prediction relocations. */ 10275 case R_PPC64_ADDR14_BRNTAKEN: 10276 case R_PPC64_REL14_BRNTAKEN: 10277 insn |= bfd_get_32 (output_bfd, 10278 contents + rel->r_offset) & ~(0x01 << 21); 10279 /* Fall thru. */ 10280 10281 case R_PPC64_REL14: 10282 max_br_offset = 1 << 15; 10283 /* Fall thru. */ 10284 10285 case R_PPC64_REL24: 10286 /* Calls to functions with a different TOC, such as calls to 10287 shared objects, need to alter the TOC pointer. This is 10288 done using a linkage stub. A REL24 branching to these 10289 linkage stubs needs to be followed by a nop, as the nop 10290 will be replaced with an instruction to restore the TOC 10291 base pointer. */ 10292 stub_entry = NULL; 10293 fdh = h; 10294 if (((h != NULL 10295 && (((fdh = h->oh) != NULL 10296 && fdh->elf.plt.plist != NULL) 10297 || (fdh = h)->elf.plt.plist != NULL)) 10298 || (sec != NULL 10299 && sec->output_section != NULL 10300 && sec->id <= htab->top_id 10301 && (htab->stub_group[sec->id].toc_off 10302 != htab->stub_group[input_section->id].toc_off))) 10303 && (stub_entry = ppc_get_stub_entry (input_section, sec, fdh, 10304 rel, htab)) != NULL 10305 && (stub_entry->stub_type == ppc_stub_plt_call 10306 || stub_entry->stub_type == ppc_stub_plt_branch_r2off 10307 || stub_entry->stub_type == ppc_stub_long_branch_r2off)) 10308 { 10309 bfd_boolean can_plt_call = FALSE; 10310 10311 if (rel->r_offset + 8 <= input_section->size) 10312 { 10313 unsigned long nop; 10314 nop = bfd_get_32 (input_bfd, contents + rel->r_offset + 4); 10315 if (nop == NOP 10316 || nop == CROR_151515 || nop == CROR_313131) 10317 { 10318 bfd_put_32 (input_bfd, LD_R2_40R1, 10319 contents + rel->r_offset + 4); 10320 can_plt_call = TRUE; 10321 } 10322 } 10323 10324 if (!can_plt_call) 10325 { 10326 if (stub_entry->stub_type == ppc_stub_plt_call) 10327 { 10328 /* If this is a plain branch rather than a branch 10329 and link, don't require a nop. However, don't 10330 allow tail calls in a shared library as they 10331 will result in r2 being corrupted. */ 10332 unsigned long br; 10333 br = bfd_get_32 (input_bfd, contents + rel->r_offset); 10334 if (info->executable && (br & 1) == 0) 10335 can_plt_call = TRUE; 10336 else 10337 stub_entry = NULL; 10338 } 10339 else if (h != NULL 10340 && strcmp (h->elf.root.root.string, 10341 ".__libc_start_main") == 0) 10342 { 10343 /* Allow crt1 branch to go via a toc adjusting stub. */ 10344 can_plt_call = TRUE; 10345 } 10346 else 10347 { 10348 if (strcmp (input_section->output_section->name, 10349 ".init") == 0 10350 || strcmp (input_section->output_section->name, 10351 ".fini") == 0) 10352 (*_bfd_error_handler) 10353 (_("%B(%A+0x%lx): automatic multiple TOCs " 10354 "not supported using your crt files; " 10355 "recompile with -mminimal-toc or upgrade gcc"), 10356 input_bfd, 10357 input_section, 10358 (long) rel->r_offset); 10359 else 10360 (*_bfd_error_handler) 10361 (_("%B(%A+0x%lx): sibling call optimization to `%s' " 10362 "does not allow automatic multiple TOCs; " 10363 "recompile with -mminimal-toc or " 10364 "-fno-optimize-sibling-calls, " 10365 "or make `%s' extern"), 10366 input_bfd, 10367 input_section, 10368 (long) rel->r_offset, 10369 sym_name, 10370 sym_name); 10371 bfd_set_error (bfd_error_bad_value); 10372 ret = FALSE; 10373 } 10374 } 10375 10376 if (can_plt_call 10377 && stub_entry->stub_type == ppc_stub_plt_call) 10378 unresolved_reloc = FALSE; 10379 } 10380 10381 if (stub_entry == NULL 10382 && get_opd_info (sec) != NULL) 10383 { 10384 /* The branch destination is the value of the opd entry. */ 10385 bfd_vma off = (relocation + addend 10386 - sec->output_section->vma 10387 - sec->output_offset); 10388 bfd_vma dest = opd_entry_value (sec, off, NULL, NULL); 10389 if (dest != (bfd_vma) -1) 10390 { 10391 relocation = dest; 10392 addend = 0; 10393 } 10394 } 10395 10396 /* If the branch is out of reach we ought to have a long 10397 branch stub. */ 10398 from = (rel->r_offset 10399 + input_section->output_offset 10400 + input_section->output_section->vma); 10401 10402 if (stub_entry == NULL 10403 && (relocation + addend - from + max_br_offset 10404 >= 2 * max_br_offset) 10405 && r_type != R_PPC64_ADDR14_BRTAKEN 10406 && r_type != R_PPC64_ADDR14_BRNTAKEN) 10407 stub_entry = ppc_get_stub_entry (input_section, sec, h, rel, 10408 htab); 10409 10410 if (stub_entry != NULL) 10411 { 10412 /* Munge up the value and addend so that we call the stub 10413 rather than the procedure directly. */ 10414 relocation = (stub_entry->stub_offset 10415 + stub_entry->stub_sec->output_offset 10416 + stub_entry->stub_sec->output_section->vma); 10417 addend = 0; 10418 } 10419 10420 if (insn != 0) 10421 { 10422 if (is_power4) 10423 { 10424 /* Set 'a' bit. This is 0b00010 in BO field for branch 10425 on CR(BI) insns (BO == 001at or 011at), and 0b01000 10426 for branch on CTR insns (BO == 1a00t or 1a01t). */ 10427 if ((insn & (0x14 << 21)) == (0x04 << 21)) 10428 insn |= 0x02 << 21; 10429 else if ((insn & (0x14 << 21)) == (0x10 << 21)) 10430 insn |= 0x08 << 21; 10431 else 10432 break; 10433 } 10434 else 10435 { 10436 /* Invert 'y' bit if not the default. */ 10437 if ((bfd_signed_vma) (relocation + addend - from) < 0) 10438 insn ^= 0x01 << 21; 10439 } 10440 10441 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 10442 } 10443 10444 /* NOP out calls to undefined weak functions. 10445 We can thus call a weak function without first 10446 checking whether the function is defined. */ 10447 else if (h != NULL 10448 && h->elf.root.type == bfd_link_hash_undefweak 10449 && r_type == R_PPC64_REL24 10450 && relocation == 0 10451 && addend == 0) 10452 { 10453 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset); 10454 continue; 10455 } 10456 break; 10457 } 10458 10459 /* Set `addend'. */ 10460 tls_type = 0; 10461 switch (r_type) 10462 { 10463 default: 10464 (*_bfd_error_handler) 10465 (_("%B: unknown relocation type %d for symbol %s"), 10466 input_bfd, (int) r_type, sym_name); 10467 10468 bfd_set_error (bfd_error_bad_value); 10469 ret = FALSE; 10470 continue; 10471 10472 case R_PPC64_NONE: 10473 case R_PPC64_TLS: 10474 case R_PPC64_GNU_VTINHERIT: 10475 case R_PPC64_GNU_VTENTRY: 10476 continue; 10477 10478 /* GOT16 relocations. Like an ADDR16 using the symbol's 10479 address in the GOT as relocation value instead of the 10480 symbol's value itself. Also, create a GOT entry for the 10481 symbol and put the symbol value there. */ 10482 case R_PPC64_GOT_TLSGD16: 10483 case R_PPC64_GOT_TLSGD16_LO: 10484 case R_PPC64_GOT_TLSGD16_HI: 10485 case R_PPC64_GOT_TLSGD16_HA: 10486 tls_type = TLS_TLS | TLS_GD; 10487 goto dogot; 10488 10489 case R_PPC64_GOT_TLSLD16: 10490 case R_PPC64_GOT_TLSLD16_LO: 10491 case R_PPC64_GOT_TLSLD16_HI: 10492 case R_PPC64_GOT_TLSLD16_HA: 10493 tls_type = TLS_TLS | TLS_LD; 10494 goto dogot; 10495 10496 case R_PPC64_GOT_TPREL16_DS: 10497 case R_PPC64_GOT_TPREL16_LO_DS: 10498 case R_PPC64_GOT_TPREL16_HI: 10499 case R_PPC64_GOT_TPREL16_HA: 10500 tls_type = TLS_TLS | TLS_TPREL; 10501 goto dogot; 10502 10503 case R_PPC64_GOT_DTPREL16_DS: 10504 case R_PPC64_GOT_DTPREL16_LO_DS: 10505 case R_PPC64_GOT_DTPREL16_HI: 10506 case R_PPC64_GOT_DTPREL16_HA: 10507 tls_type = TLS_TLS | TLS_DTPREL; 10508 goto dogot; 10509 10510 case R_PPC64_GOT16: 10511 case R_PPC64_GOT16_LO: 10512 case R_PPC64_GOT16_HI: 10513 case R_PPC64_GOT16_HA: 10514 case R_PPC64_GOT16_DS: 10515 case R_PPC64_GOT16_LO_DS: 10516 dogot: 10517 { 10518 /* Relocation is to the entry for this symbol in the global 10519 offset table. */ 10520 asection *got; 10521 bfd_vma *offp; 10522 bfd_vma off; 10523 unsigned long indx = 0; 10524 10525 if (tls_type == (TLS_TLS | TLS_LD) 10526 && (h == NULL 10527 || !h->elf.def_dynamic)) 10528 offp = &ppc64_tlsld_got (input_bfd)->offset; 10529 else 10530 { 10531 struct got_entry *ent; 10532 10533 if (h != NULL) 10534 { 10535 bfd_boolean dyn = htab->elf.dynamic_sections_created; 10536 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, 10537 &h->elf) 10538 || (info->shared 10539 && SYMBOL_REFERENCES_LOCAL (info, &h->elf))) 10540 /* This is actually a static link, or it is a 10541 -Bsymbolic link and the symbol is defined 10542 locally, or the symbol was forced to be local 10543 because of a version file. */ 10544 ; 10545 else 10546 { 10547 indx = h->elf.dynindx; 10548 unresolved_reloc = FALSE; 10549 } 10550 ent = h->elf.got.glist; 10551 } 10552 else 10553 { 10554 if (local_got_ents == NULL) 10555 abort (); 10556 ent = local_got_ents[r_symndx]; 10557 } 10558 10559 for (; ent != NULL; ent = ent->next) 10560 if (ent->addend == orig_addend 10561 && ent->owner == input_bfd 10562 && ent->tls_type == tls_type) 10563 break; 10564 if (ent == NULL) 10565 abort (); 10566 offp = &ent->got.offset; 10567 } 10568 10569 got = ppc64_elf_tdata (input_bfd)->got; 10570 if (got == NULL) 10571 abort (); 10572 10573 /* The offset must always be a multiple of 8. We use the 10574 least significant bit to record whether we have already 10575 processed this entry. */ 10576 off = *offp; 10577 if ((off & 1) != 0) 10578 off &= ~1; 10579 else 10580 { 10581 /* Generate relocs for the dynamic linker, except in 10582 the case of TLSLD where we'll use one entry per 10583 module. */ 10584 asection *relgot = ppc64_elf_tdata (input_bfd)->relgot; 10585 10586 *offp = off | 1; 10587 if ((info->shared || indx != 0) 10588 && (h == NULL 10589 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT 10590 || h->elf.root.type != bfd_link_hash_undefweak)) 10591 { 10592 outrel.r_offset = (got->output_section->vma 10593 + got->output_offset 10594 + off); 10595 outrel.r_addend = addend; 10596 if (tls_type & (TLS_LD | TLS_GD)) 10597 { 10598 outrel.r_addend = 0; 10599 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPMOD64); 10600 if (tls_type == (TLS_TLS | TLS_GD)) 10601 { 10602 loc = relgot->contents; 10603 loc += (relgot->reloc_count++ 10604 * sizeof (Elf64_External_Rela)); 10605 bfd_elf64_swap_reloca_out (output_bfd, 10606 &outrel, loc); 10607 outrel.r_offset += 8; 10608 outrel.r_addend = addend; 10609 outrel.r_info 10610 = ELF64_R_INFO (indx, R_PPC64_DTPREL64); 10611 } 10612 } 10613 else if (tls_type == (TLS_TLS | TLS_DTPREL)) 10614 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPREL64); 10615 else if (tls_type == (TLS_TLS | TLS_TPREL)) 10616 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_TPREL64); 10617 else if (indx == 0) 10618 { 10619 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_RELATIVE); 10620 10621 /* Write the .got section contents for the sake 10622 of prelink. */ 10623 loc = got->contents + off; 10624 bfd_put_64 (output_bfd, outrel.r_addend + relocation, 10625 loc); 10626 } 10627 else 10628 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_GLOB_DAT); 10629 10630 if (indx == 0 && tls_type != (TLS_TLS | TLS_LD)) 10631 { 10632 outrel.r_addend += relocation; 10633 if (tls_type & (TLS_GD | TLS_DTPREL | TLS_TPREL)) 10634 outrel.r_addend -= htab->elf.tls_sec->vma; 10635 } 10636 loc = relgot->contents; 10637 loc += (relgot->reloc_count++ 10638 * sizeof (Elf64_External_Rela)); 10639 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 10640 } 10641 10642 /* Init the .got section contents here if we're not 10643 emitting a reloc. */ 10644 else 10645 { 10646 relocation += addend; 10647 if (tls_type == (TLS_TLS | TLS_LD)) 10648 relocation = 1; 10649 else if (tls_type != 0) 10650 { 10651 relocation -= htab->elf.tls_sec->vma + DTP_OFFSET; 10652 if (tls_type == (TLS_TLS | TLS_TPREL)) 10653 relocation += DTP_OFFSET - TP_OFFSET; 10654 10655 if (tls_type == (TLS_TLS | TLS_GD)) 10656 { 10657 bfd_put_64 (output_bfd, relocation, 10658 got->contents + off + 8); 10659 relocation = 1; 10660 } 10661 } 10662 10663 bfd_put_64 (output_bfd, relocation, 10664 got->contents + off); 10665 } 10666 } 10667 10668 if (off >= (bfd_vma) -2) 10669 abort (); 10670 10671 relocation = got->output_offset + off; 10672 10673 /* TOC base (r2) is TOC start plus 0x8000. */ 10674 addend = -TOC_BASE_OFF; 10675 } 10676 break; 10677 10678 case R_PPC64_PLT16_HA: 10679 case R_PPC64_PLT16_HI: 10680 case R_PPC64_PLT16_LO: 10681 case R_PPC64_PLT32: 10682 case R_PPC64_PLT64: 10683 /* Relocation is to the entry for this symbol in the 10684 procedure linkage table. */ 10685 10686 /* Resolve a PLT reloc against a local symbol directly, 10687 without using the procedure linkage table. */ 10688 if (h == NULL) 10689 break; 10690 10691 /* It's possible that we didn't make a PLT entry for this 10692 symbol. This happens when statically linking PIC code, 10693 or when using -Bsymbolic. Go find a match if there is a 10694 PLT entry. */ 10695 if (htab->plt != NULL) 10696 { 10697 struct plt_entry *ent; 10698 for (ent = h->elf.plt.plist; ent != NULL; ent = ent->next) 10699 if (ent->addend == orig_addend 10700 && ent->plt.offset != (bfd_vma) -1) 10701 { 10702 relocation = (htab->plt->output_section->vma 10703 + htab->plt->output_offset 10704 + ent->plt.offset); 10705 unresolved_reloc = FALSE; 10706 } 10707 } 10708 break; 10709 10710 case R_PPC64_TOC: 10711 /* Relocation value is TOC base. */ 10712 relocation = TOCstart; 10713 if (r_symndx == 0) 10714 relocation += htab->stub_group[input_section->id].toc_off; 10715 else if (unresolved_reloc) 10716 ; 10717 else if (sec != NULL && sec->id <= htab->top_id) 10718 relocation += htab->stub_group[sec->id].toc_off; 10719 else 10720 unresolved_reloc = TRUE; 10721 goto dodyn2; 10722 10723 /* TOC16 relocs. We want the offset relative to the TOC base, 10724 which is the address of the start of the TOC plus 0x8000. 10725 The TOC consists of sections .got, .toc, .tocbss, and .plt, 10726 in this order. */ 10727 case R_PPC64_TOC16: 10728 case R_PPC64_TOC16_LO: 10729 case R_PPC64_TOC16_HI: 10730 case R_PPC64_TOC16_DS: 10731 case R_PPC64_TOC16_LO_DS: 10732 case R_PPC64_TOC16_HA: 10733 addend -= TOCstart + htab->stub_group[input_section->id].toc_off; 10734 break; 10735 10736 /* Relocate against the beginning of the section. */ 10737 case R_PPC64_SECTOFF: 10738 case R_PPC64_SECTOFF_LO: 10739 case R_PPC64_SECTOFF_HI: 10740 case R_PPC64_SECTOFF_DS: 10741 case R_PPC64_SECTOFF_LO_DS: 10742 case R_PPC64_SECTOFF_HA: 10743 if (sec != NULL) 10744 addend -= sec->output_section->vma; 10745 break; 10746 10747 case R_PPC64_REL14: 10748 case R_PPC64_REL14_BRNTAKEN: 10749 case R_PPC64_REL14_BRTAKEN: 10750 case R_PPC64_REL24: 10751 break; 10752 10753 case R_PPC64_TPREL16: 10754 case R_PPC64_TPREL16_LO: 10755 case R_PPC64_TPREL16_HI: 10756 case R_PPC64_TPREL16_HA: 10757 case R_PPC64_TPREL16_DS: 10758 case R_PPC64_TPREL16_LO_DS: 10759 case R_PPC64_TPREL16_HIGHER: 10760 case R_PPC64_TPREL16_HIGHERA: 10761 case R_PPC64_TPREL16_HIGHEST: 10762 case R_PPC64_TPREL16_HIGHESTA: 10763 addend -= htab->elf.tls_sec->vma + TP_OFFSET; 10764 if (info->shared) 10765 /* The TPREL16 relocs shouldn't really be used in shared 10766 libs as they will result in DT_TEXTREL being set, but 10767 support them anyway. */ 10768 goto dodyn; 10769 break; 10770 10771 case R_PPC64_DTPREL16: 10772 case R_PPC64_DTPREL16_LO: 10773 case R_PPC64_DTPREL16_HI: 10774 case R_PPC64_DTPREL16_HA: 10775 case R_PPC64_DTPREL16_DS: 10776 case R_PPC64_DTPREL16_LO_DS: 10777 case R_PPC64_DTPREL16_HIGHER: 10778 case R_PPC64_DTPREL16_HIGHERA: 10779 case R_PPC64_DTPREL16_HIGHEST: 10780 case R_PPC64_DTPREL16_HIGHESTA: 10781 addend -= htab->elf.tls_sec->vma + DTP_OFFSET; 10782 break; 10783 10784 case R_PPC64_DTPMOD64: 10785 relocation = 1; 10786 addend = 0; 10787 goto dodyn; 10788 10789 case R_PPC64_TPREL64: 10790 addend -= htab->elf.tls_sec->vma + TP_OFFSET; 10791 goto dodyn; 10792 10793 case R_PPC64_DTPREL64: 10794 addend -= htab->elf.tls_sec->vma + DTP_OFFSET; 10795 /* Fall thru */ 10796 10797 /* Relocations that may need to be propagated if this is a 10798 dynamic object. */ 10799 case R_PPC64_REL30: 10800 case R_PPC64_REL32: 10801 case R_PPC64_REL64: 10802 case R_PPC64_ADDR14: 10803 case R_PPC64_ADDR14_BRNTAKEN: 10804 case R_PPC64_ADDR14_BRTAKEN: 10805 case R_PPC64_ADDR16: 10806 case R_PPC64_ADDR16_DS: 10807 case R_PPC64_ADDR16_HA: 10808 case R_PPC64_ADDR16_HI: 10809 case R_PPC64_ADDR16_HIGHER: 10810 case R_PPC64_ADDR16_HIGHERA: 10811 case R_PPC64_ADDR16_HIGHEST: 10812 case R_PPC64_ADDR16_HIGHESTA: 10813 case R_PPC64_ADDR16_LO: 10814 case R_PPC64_ADDR16_LO_DS: 10815 case R_PPC64_ADDR24: 10816 case R_PPC64_ADDR32: 10817 case R_PPC64_ADDR64: 10818 case R_PPC64_UADDR16: 10819 case R_PPC64_UADDR32: 10820 case R_PPC64_UADDR64: 10821 /* r_symndx will be zero only for relocs against symbols 10822 from removed linkonce sections, or sections discarded by 10823 a linker script. */ 10824 dodyn: 10825 if (r_symndx == 0) 10826 { 10827 _bfd_clear_contents (ppc64_elf_howto_table[r_type], input_bfd, 10828 contents + rel->r_offset); 10829 break; 10830 } 10831 /* Fall thru. */ 10832 10833 dodyn2: 10834 if ((input_section->flags & SEC_ALLOC) == 0) 10835 break; 10836 10837 if (NO_OPD_RELOCS && is_opd) 10838 break; 10839 10840 if ((info->shared 10841 && (h == NULL 10842 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT 10843 || h->elf.root.type != bfd_link_hash_undefweak) 10844 && (MUST_BE_DYN_RELOC (r_type) 10845 || !SYMBOL_CALLS_LOCAL (info, &h->elf))) 10846 || (ELIMINATE_COPY_RELOCS 10847 && !info->shared 10848 && h != NULL 10849 && h->elf.dynindx != -1 10850 && !h->elf.non_got_ref 10851 && h->elf.def_dynamic 10852 && !h->elf.def_regular)) 10853 { 10854 Elf_Internal_Rela outrel; 10855 bfd_boolean skip, relocate; 10856 asection *sreloc; 10857 bfd_byte *loc; 10858 bfd_vma out_off; 10859 10860 /* When generating a dynamic object, these relocations 10861 are copied into the output file to be resolved at run 10862 time. */ 10863 10864 skip = FALSE; 10865 relocate = FALSE; 10866 10867 out_off = _bfd_elf_section_offset (output_bfd, info, 10868 input_section, rel->r_offset); 10869 if (out_off == (bfd_vma) -1) 10870 skip = TRUE; 10871 else if (out_off == (bfd_vma) -2) 10872 skip = TRUE, relocate = TRUE; 10873 out_off += (input_section->output_section->vma 10874 + input_section->output_offset); 10875 outrel.r_offset = out_off; 10876 outrel.r_addend = rel->r_addend; 10877 10878 /* Optimize unaligned reloc use. */ 10879 if ((r_type == R_PPC64_ADDR64 && (out_off & 7) != 0) 10880 || (r_type == R_PPC64_UADDR64 && (out_off & 7) == 0)) 10881 r_type ^= R_PPC64_ADDR64 ^ R_PPC64_UADDR64; 10882 else if ((r_type == R_PPC64_ADDR32 && (out_off & 3) != 0) 10883 || (r_type == R_PPC64_UADDR32 && (out_off & 3) == 0)) 10884 r_type ^= R_PPC64_ADDR32 ^ R_PPC64_UADDR32; 10885 else if ((r_type == R_PPC64_ADDR16 && (out_off & 1) != 0) 10886 || (r_type == R_PPC64_UADDR16 && (out_off & 1) == 0)) 10887 r_type ^= R_PPC64_ADDR16 ^ R_PPC64_UADDR16; 10888 10889 if (skip) 10890 memset (&outrel, 0, sizeof outrel); 10891 else if (!SYMBOL_REFERENCES_LOCAL (info, &h->elf) 10892 && !is_opd 10893 && r_type != R_PPC64_TOC) 10894 outrel.r_info = ELF64_R_INFO (h->elf.dynindx, r_type); 10895 else 10896 { 10897 /* This symbol is local, or marked to become local, 10898 or this is an opd section reloc which must point 10899 at a local function. */ 10900 outrel.r_addend += relocation; 10901 if (r_type == R_PPC64_ADDR64 || r_type == R_PPC64_TOC) 10902 { 10903 if (is_opd && h != NULL) 10904 { 10905 /* Lie about opd entries. This case occurs 10906 when building shared libraries and we 10907 reference a function in another shared 10908 lib. The same thing happens for a weak 10909 definition in an application that's 10910 overridden by a strong definition in a 10911 shared lib. (I believe this is a generic 10912 bug in binutils handling of weak syms.) 10913 In these cases we won't use the opd 10914 entry in this lib. */ 10915 unresolved_reloc = FALSE; 10916 } 10917 outrel.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); 10918 10919 /* We need to relocate .opd contents for ld.so. 10920 Prelink also wants simple and consistent rules 10921 for relocs. This make all RELATIVE relocs have 10922 *r_offset equal to r_addend. */ 10923 relocate = TRUE; 10924 } 10925 else 10926 { 10927 long indx = 0; 10928 10929 if (bfd_is_abs_section (sec)) 10930 ; 10931 else if (sec == NULL || sec->owner == NULL) 10932 { 10933 bfd_set_error (bfd_error_bad_value); 10934 return FALSE; 10935 } 10936 else 10937 { 10938 asection *osec; 10939 10940 osec = sec->output_section; 10941 indx = elf_section_data (osec)->dynindx; 10942 10943 if (indx == 0) 10944 { 10945 if ((osec->flags & SEC_READONLY) == 0 10946 && htab->elf.data_index_section != NULL) 10947 osec = htab->elf.data_index_section; 10948 else 10949 osec = htab->elf.text_index_section; 10950 indx = elf_section_data (osec)->dynindx; 10951 } 10952 BFD_ASSERT (indx != 0); 10953 10954 /* We are turning this relocation into one 10955 against a section symbol, so subtract out 10956 the output section's address but not the 10957 offset of the input section in the output 10958 section. */ 10959 outrel.r_addend -= osec->vma; 10960 } 10961 10962 outrel.r_info = ELF64_R_INFO (indx, r_type); 10963 } 10964 } 10965 10966 sreloc = elf_section_data (input_section)->sreloc; 10967 if (sreloc == NULL) 10968 abort (); 10969 10970 if (sreloc->reloc_count * sizeof (Elf64_External_Rela) 10971 >= sreloc->size) 10972 abort (); 10973 loc = sreloc->contents; 10974 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 10975 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 10976 10977 /* If this reloc is against an external symbol, it will 10978 be computed at runtime, so there's no need to do 10979 anything now. However, for the sake of prelink ensure 10980 that the section contents are a known value. */ 10981 if (! relocate) 10982 { 10983 unresolved_reloc = FALSE; 10984 /* The value chosen here is quite arbitrary as ld.so 10985 ignores section contents except for the special 10986 case of .opd where the contents might be accessed 10987 before relocation. Choose zero, as that won't 10988 cause reloc overflow. */ 10989 relocation = 0; 10990 addend = 0; 10991 /* Use *r_offset == r_addend for R_PPC64_ADDR64 relocs 10992 to improve backward compatibility with older 10993 versions of ld. */ 10994 if (r_type == R_PPC64_ADDR64) 10995 addend = outrel.r_addend; 10996 /* Adjust pc_relative relocs to have zero in *r_offset. */ 10997 else if (ppc64_elf_howto_table[r_type]->pc_relative) 10998 addend = (input_section->output_section->vma 10999 + input_section->output_offset 11000 + rel->r_offset); 11001 } 11002 } 11003 break; 11004 11005 case R_PPC64_COPY: 11006 case R_PPC64_GLOB_DAT: 11007 case R_PPC64_JMP_SLOT: 11008 case R_PPC64_RELATIVE: 11009 /* We shouldn't ever see these dynamic relocs in relocatable 11010 files. */ 11011 /* Fall through. */ 11012 11013 case R_PPC64_PLTGOT16: 11014 case R_PPC64_PLTGOT16_DS: 11015 case R_PPC64_PLTGOT16_HA: 11016 case R_PPC64_PLTGOT16_HI: 11017 case R_PPC64_PLTGOT16_LO: 11018 case R_PPC64_PLTGOT16_LO_DS: 11019 case R_PPC64_PLTREL32: 11020 case R_PPC64_PLTREL64: 11021 /* These ones haven't been implemented yet. */ 11022 11023 (*_bfd_error_handler) 11024 (_("%B: relocation %s is not supported for symbol %s."), 11025 input_bfd, 11026 ppc64_elf_howto_table[r_type]->name, sym_name); 11027 11028 bfd_set_error (bfd_error_invalid_operation); 11029 ret = FALSE; 11030 continue; 11031 } 11032 11033 /* Do any further special processing. */ 11034 switch (r_type) 11035 { 11036 default: 11037 break; 11038 11039 case R_PPC64_ADDR16_HA: 11040 case R_PPC64_ADDR16_HIGHERA: 11041 case R_PPC64_ADDR16_HIGHESTA: 11042 case R_PPC64_TOC16_HA: 11043 case R_PPC64_SECTOFF_HA: 11044 case R_PPC64_TPREL16_HA: 11045 case R_PPC64_DTPREL16_HA: 11046 case R_PPC64_TPREL16_HIGHER: 11047 case R_PPC64_TPREL16_HIGHERA: 11048 case R_PPC64_TPREL16_HIGHEST: 11049 case R_PPC64_TPREL16_HIGHESTA: 11050 case R_PPC64_DTPREL16_HIGHER: 11051 case R_PPC64_DTPREL16_HIGHERA: 11052 case R_PPC64_DTPREL16_HIGHEST: 11053 case R_PPC64_DTPREL16_HIGHESTA: 11054 /* It's just possible that this symbol is a weak symbol 11055 that's not actually defined anywhere. In that case, 11056 'sec' would be NULL, and we should leave the symbol 11057 alone (it will be set to zero elsewhere in the link). */ 11058 if (sec == NULL) 11059 break; 11060 /* Fall thru */ 11061 11062 case R_PPC64_GOT16_HA: 11063 case R_PPC64_PLTGOT16_HA: 11064 case R_PPC64_PLT16_HA: 11065 case R_PPC64_GOT_TLSGD16_HA: 11066 case R_PPC64_GOT_TLSLD16_HA: 11067 case R_PPC64_GOT_TPREL16_HA: 11068 case R_PPC64_GOT_DTPREL16_HA: 11069 /* Add 0x10000 if sign bit in 0:15 is set. 11070 Bits 0:15 are not used. */ 11071 addend += 0x8000; 11072 break; 11073 11074 case R_PPC64_ADDR16_DS: 11075 case R_PPC64_ADDR16_LO_DS: 11076 case R_PPC64_GOT16_DS: 11077 case R_PPC64_GOT16_LO_DS: 11078 case R_PPC64_PLT16_LO_DS: 11079 case R_PPC64_SECTOFF_DS: 11080 case R_PPC64_SECTOFF_LO_DS: 11081 case R_PPC64_TOC16_DS: 11082 case R_PPC64_TOC16_LO_DS: 11083 case R_PPC64_PLTGOT16_DS: 11084 case R_PPC64_PLTGOT16_LO_DS: 11085 case R_PPC64_GOT_TPREL16_DS: 11086 case R_PPC64_GOT_TPREL16_LO_DS: 11087 case R_PPC64_GOT_DTPREL16_DS: 11088 case R_PPC64_GOT_DTPREL16_LO_DS: 11089 case R_PPC64_TPREL16_DS: 11090 case R_PPC64_TPREL16_LO_DS: 11091 case R_PPC64_DTPREL16_DS: 11092 case R_PPC64_DTPREL16_LO_DS: 11093 insn = bfd_get_32 (input_bfd, contents + (rel->r_offset & ~3)); 11094 mask = 3; 11095 /* If this reloc is against an lq insn, then the value must be 11096 a multiple of 16. This is somewhat of a hack, but the 11097 "correct" way to do this by defining _DQ forms of all the 11098 _DS relocs bloats all reloc switches in this file. It 11099 doesn't seem to make much sense to use any of these relocs 11100 in data, so testing the insn should be safe. */ 11101 if ((insn & (0x3f << 26)) == (56u << 26)) 11102 mask = 15; 11103 if (((relocation + addend) & mask) != 0) 11104 { 11105 (*_bfd_error_handler) 11106 (_("%B: error: relocation %s not a multiple of %d"), 11107 input_bfd, 11108 ppc64_elf_howto_table[r_type]->name, 11109 mask + 1); 11110 bfd_set_error (bfd_error_bad_value); 11111 ret = FALSE; 11112 continue; 11113 } 11114 break; 11115 } 11116 11117 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 11118 because such sections are not SEC_ALLOC and thus ld.so will 11119 not process them. */ 11120 if (unresolved_reloc 11121 && !((input_section->flags & SEC_DEBUGGING) != 0 11122 && h->elf.def_dynamic)) 11123 { 11124 (*_bfd_error_handler) 11125 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 11126 input_bfd, 11127 input_section, 11128 (long) rel->r_offset, 11129 ppc64_elf_howto_table[(int) r_type]->name, 11130 h->elf.root.root.string); 11131 ret = FALSE; 11132 } 11133 11134 r = _bfd_final_link_relocate (ppc64_elf_howto_table[(int) r_type], 11135 input_bfd, 11136 input_section, 11137 contents, 11138 rel->r_offset, 11139 relocation, 11140 addend); 11141 11142 if (r != bfd_reloc_ok) 11143 { 11144 if (sym_name == NULL) 11145 sym_name = "(null)"; 11146 if (r == bfd_reloc_overflow) 11147 { 11148 if (warned) 11149 continue; 11150 if (h != NULL 11151 && h->elf.root.type == bfd_link_hash_undefweak 11152 && ppc64_elf_howto_table[r_type]->pc_relative) 11153 { 11154 /* Assume this is a call protected by other code that 11155 detects the symbol is undefined. If this is the case, 11156 we can safely ignore the overflow. If not, the 11157 program is hosed anyway, and a little warning isn't 11158 going to help. */ 11159 11160 continue; 11161 } 11162 11163 if (!((*info->callbacks->reloc_overflow) 11164 (info, (h ? &h->elf.root : NULL), sym_name, 11165 ppc64_elf_howto_table[r_type]->name, 11166 orig_addend, input_bfd, input_section, rel->r_offset))) 11167 return FALSE; 11168 } 11169 else 11170 { 11171 (*_bfd_error_handler) 11172 (_("%B(%A+0x%lx): %s reloc against `%s': error %d"), 11173 input_bfd, 11174 input_section, 11175 (long) rel->r_offset, 11176 ppc64_elf_howto_table[r_type]->name, 11177 sym_name, 11178 (int) r); 11179 ret = FALSE; 11180 } 11181 } 11182 } 11183 11184 /* If we're emitting relocations, then shortly after this function 11185 returns, reloc offsets and addends for this section will be 11186 adjusted. Worse, reloc symbol indices will be for the output 11187 file rather than the input. Save a copy of the relocs for 11188 opd_entry_value. */ 11189 if (is_opd && (info->emitrelocations || info->relocatable)) 11190 { 11191 bfd_size_type amt; 11192 amt = input_section->reloc_count * sizeof (Elf_Internal_Rela); 11193 rel = bfd_alloc (input_bfd, amt); 11194 BFD_ASSERT (ppc64_elf_tdata (input_bfd)->opd_relocs == NULL); 11195 ppc64_elf_tdata (input_bfd)->opd_relocs = rel; 11196 if (rel == NULL) 11197 return FALSE; 11198 memcpy (rel, relocs, amt); 11199 } 11200 return ret; 11201} 11202 11203/* Adjust the value of any local symbols in opd sections. */ 11204 11205static bfd_boolean 11206ppc64_elf_output_symbol_hook (struct bfd_link_info *info, 11207 const char *name ATTRIBUTE_UNUSED, 11208 Elf_Internal_Sym *elfsym, 11209 asection *input_sec, 11210 struct elf_link_hash_entry *h) 11211{ 11212 long *opd_adjust, adjust; 11213 bfd_vma value; 11214 11215 if (h != NULL) 11216 return TRUE; 11217 11218 opd_adjust = get_opd_info (input_sec); 11219 if (opd_adjust == NULL) 11220 return TRUE; 11221 11222 value = elfsym->st_value - input_sec->output_offset; 11223 if (!info->relocatable) 11224 value -= input_sec->output_section->vma; 11225 11226 adjust = opd_adjust[value / 8]; 11227 if (adjust == -1) 11228 elfsym->st_value = 0; 11229 else 11230 elfsym->st_value += adjust; 11231 return TRUE; 11232} 11233 11234/* Finish up dynamic symbol handling. We set the contents of various 11235 dynamic sections here. */ 11236 11237static bfd_boolean 11238ppc64_elf_finish_dynamic_symbol (bfd *output_bfd, 11239 struct bfd_link_info *info, 11240 struct elf_link_hash_entry *h, 11241 Elf_Internal_Sym *sym) 11242{ 11243 struct ppc_link_hash_table *htab; 11244 struct plt_entry *ent; 11245 Elf_Internal_Rela rela; 11246 bfd_byte *loc; 11247 11248 htab = ppc_hash_table (info); 11249 11250 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 11251 if (ent->plt.offset != (bfd_vma) -1) 11252 { 11253 /* This symbol has an entry in the procedure linkage 11254 table. Set it up. */ 11255 11256 if (htab->plt == NULL 11257 || htab->relplt == NULL 11258 || htab->glink == NULL) 11259 abort (); 11260 11261 /* Create a JMP_SLOT reloc to inform the dynamic linker to 11262 fill in the PLT entry. */ 11263 rela.r_offset = (htab->plt->output_section->vma 11264 + htab->plt->output_offset 11265 + ent->plt.offset); 11266 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_JMP_SLOT); 11267 rela.r_addend = ent->addend; 11268 11269 loc = htab->relplt->contents; 11270 loc += ((ent->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE 11271 * sizeof (Elf64_External_Rela)); 11272 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 11273 } 11274 11275 if (h->needs_copy) 11276 { 11277 Elf_Internal_Rela rela; 11278 bfd_byte *loc; 11279 11280 /* This symbol needs a copy reloc. Set it up. */ 11281 11282 if (h->dynindx == -1 11283 || (h->root.type != bfd_link_hash_defined 11284 && h->root.type != bfd_link_hash_defweak) 11285 || htab->relbss == NULL) 11286 abort (); 11287 11288 rela.r_offset = (h->root.u.def.value 11289 + h->root.u.def.section->output_section->vma 11290 + h->root.u.def.section->output_offset); 11291 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_COPY); 11292 rela.r_addend = 0; 11293 loc = htab->relbss->contents; 11294 loc += htab->relbss->reloc_count++ * sizeof (Elf64_External_Rela); 11295 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 11296 } 11297 11298 /* Mark some specially defined symbols as absolute. */ 11299 if (strcmp (h->root.root.string, "_DYNAMIC") == 0) 11300 sym->st_shndx = SHN_ABS; 11301 11302 return TRUE; 11303} 11304 11305/* Used to decide how to sort relocs in an optimal manner for the 11306 dynamic linker, before writing them out. */ 11307 11308static enum elf_reloc_type_class 11309ppc64_elf_reloc_type_class (const Elf_Internal_Rela *rela) 11310{ 11311 enum elf_ppc64_reloc_type r_type; 11312 11313 r_type = ELF64_R_TYPE (rela->r_info); 11314 switch (r_type) 11315 { 11316 case R_PPC64_RELATIVE: 11317 return reloc_class_relative; 11318 case R_PPC64_JMP_SLOT: 11319 return reloc_class_plt; 11320 case R_PPC64_COPY: 11321 return reloc_class_copy; 11322 default: 11323 return reloc_class_normal; 11324 } 11325} 11326 11327/* Finish up the dynamic sections. */ 11328 11329static bfd_boolean 11330ppc64_elf_finish_dynamic_sections (bfd *output_bfd, 11331 struct bfd_link_info *info) 11332{ 11333 struct ppc_link_hash_table *htab; 11334 bfd *dynobj; 11335 asection *sdyn; 11336 11337 htab = ppc_hash_table (info); 11338 dynobj = htab->elf.dynobj; 11339 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 11340 11341 if (htab->elf.dynamic_sections_created) 11342 { 11343 Elf64_External_Dyn *dyncon, *dynconend; 11344 11345 if (sdyn == NULL || htab->got == NULL) 11346 abort (); 11347 11348 dyncon = (Elf64_External_Dyn *) sdyn->contents; 11349 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); 11350 for (; dyncon < dynconend; dyncon++) 11351 { 11352 Elf_Internal_Dyn dyn; 11353 asection *s; 11354 11355 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); 11356 11357 switch (dyn.d_tag) 11358 { 11359 default: 11360 continue; 11361 11362 case DT_PPC64_GLINK: 11363 s = htab->glink; 11364 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 11365 /* We stupidly defined DT_PPC64_GLINK to be the start 11366 of glink rather than the first entry point, which is 11367 what ld.so needs, and now have a bigger stub to 11368 support automatic multiple TOCs. */ 11369 dyn.d_un.d_ptr += GLINK_CALL_STUB_SIZE - 32; 11370 break; 11371 11372 case DT_PPC64_OPD: 11373 s = bfd_get_section_by_name (output_bfd, ".opd"); 11374 if (s == NULL) 11375 continue; 11376 dyn.d_un.d_ptr = s->vma; 11377 break; 11378 11379 case DT_PPC64_OPDSZ: 11380 s = bfd_get_section_by_name (output_bfd, ".opd"); 11381 if (s == NULL) 11382 continue; 11383 dyn.d_un.d_val = s->size; 11384 break; 11385 11386 case DT_PLTGOT: 11387 s = htab->plt; 11388 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 11389 break; 11390 11391 case DT_JMPREL: 11392 s = htab->relplt; 11393 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 11394 break; 11395 11396 case DT_PLTRELSZ: 11397 dyn.d_un.d_val = htab->relplt->size; 11398 break; 11399 11400 case DT_RELASZ: 11401 /* Don't count procedure linkage table relocs in the 11402 overall reloc count. */ 11403 s = htab->relplt; 11404 if (s == NULL) 11405 continue; 11406 dyn.d_un.d_val -= s->size; 11407 break; 11408 11409 case DT_RELA: 11410 /* We may not be using the standard ELF linker script. 11411 If .rela.plt is the first .rela section, we adjust 11412 DT_RELA to not include it. */ 11413 s = htab->relplt; 11414 if (s == NULL) 11415 continue; 11416 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) 11417 continue; 11418 dyn.d_un.d_ptr += s->size; 11419 break; 11420 } 11421 11422 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); 11423 } 11424 } 11425 11426 if (htab->got != NULL && htab->got->size != 0) 11427 { 11428 /* Fill in the first entry in the global offset table. 11429 We use it to hold the link-time TOCbase. */ 11430 bfd_put_64 (output_bfd, 11431 elf_gp (output_bfd) + TOC_BASE_OFF, 11432 htab->got->contents); 11433 11434 /* Set .got entry size. */ 11435 elf_section_data (htab->got->output_section)->this_hdr.sh_entsize = 8; 11436 } 11437 11438 if (htab->plt != NULL && htab->plt->size != 0) 11439 { 11440 /* Set .plt entry size. */ 11441 elf_section_data (htab->plt->output_section)->this_hdr.sh_entsize 11442 = PLT_ENTRY_SIZE; 11443 } 11444 11445 /* We need to handle writing out multiple GOT sections ourselves, 11446 since we didn't add them to DYNOBJ. We know dynobj is the first 11447 bfd. */ 11448 while ((dynobj = dynobj->link_next) != NULL) 11449 { 11450 asection *s; 11451 11452 if (!is_ppc64_elf_target (dynobj->xvec)) 11453 continue; 11454 11455 s = ppc64_elf_tdata (dynobj)->got; 11456 if (s != NULL 11457 && s->size != 0 11458 && s->output_section != bfd_abs_section_ptr 11459 && !bfd_set_section_contents (output_bfd, s->output_section, 11460 s->contents, s->output_offset, 11461 s->size)) 11462 return FALSE; 11463 s = ppc64_elf_tdata (dynobj)->relgot; 11464 if (s != NULL 11465 && s->size != 0 11466 && s->output_section != bfd_abs_section_ptr 11467 && !bfd_set_section_contents (output_bfd, s->output_section, 11468 s->contents, s->output_offset, 11469 s->size)) 11470 return FALSE; 11471 } 11472 11473 return TRUE; 11474} 11475 11476#include "elf64-target.h" 11477