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 "bfd.h" 29#include "sysdep.h" 30#include "bfdlink.h" 31#include "libbfd.h" 32#include "elf-bfd.h" 33#include "elf/ppc64.h" 34#include "elf64-ppc.h" 35 36static bfd_reloc_status_type ppc64_elf_ha_reloc 37 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 38static bfd_reloc_status_type ppc64_elf_branch_reloc 39 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 40static bfd_reloc_status_type ppc64_elf_brtaken_reloc 41 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 42static bfd_reloc_status_type ppc64_elf_sectoff_reloc 43 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 44static bfd_reloc_status_type ppc64_elf_sectoff_ha_reloc 45 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 46static bfd_reloc_status_type ppc64_elf_toc_reloc 47 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 48static bfd_reloc_status_type ppc64_elf_toc_ha_reloc 49 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 50static bfd_reloc_status_type ppc64_elf_toc64_reloc 51 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 52static bfd_reloc_status_type ppc64_elf_unhandled_reloc 53 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 54static bfd_vma opd_entry_value 55 (asection *, bfd_vma, asection **, bfd_vma *); 56 57#define TARGET_LITTLE_SYM bfd_elf64_powerpcle_vec 58#define TARGET_LITTLE_NAME "elf64-powerpcle" 59#define TARGET_BIG_SYM bfd_elf64_powerpc_vec 60#define TARGET_BIG_NAME "elf64-powerpc" 61#define ELF_ARCH bfd_arch_powerpc 62#define ELF_MACHINE_CODE EM_PPC64 63#define ELF_MAXPAGESIZE 0x10000 64#define elf_info_to_howto ppc64_elf_info_to_howto 65 66#define elf_backend_want_got_sym 0 67#define elf_backend_want_plt_sym 0 68#define elf_backend_plt_alignment 3 69#define elf_backend_plt_not_loaded 1 70#define elf_backend_got_header_size 8 71#define elf_backend_can_gc_sections 1 72#define elf_backend_can_refcount 1 73#define elf_backend_rela_normal 1 74 75#define bfd_elf64_mkobject ppc64_elf_mkobject 76#define bfd_elf64_bfd_reloc_type_lookup ppc64_elf_reloc_type_lookup 77#define bfd_elf64_bfd_merge_private_bfd_data ppc64_elf_merge_private_bfd_data 78#define bfd_elf64_new_section_hook ppc64_elf_new_section_hook 79#define bfd_elf64_bfd_link_hash_table_create ppc64_elf_link_hash_table_create 80#define bfd_elf64_bfd_link_hash_table_free ppc64_elf_link_hash_table_free 81#define bfd_elf64_get_synthetic_symtab ppc64_elf_get_synthetic_symtab 82 83#define elf_backend_object_p ppc64_elf_object_p 84#define elf_backend_grok_prstatus ppc64_elf_grok_prstatus 85#define elf_backend_grok_psinfo ppc64_elf_grok_psinfo 86#define elf_backend_create_dynamic_sections ppc64_elf_create_dynamic_sections 87#define elf_backend_copy_indirect_symbol ppc64_elf_copy_indirect_symbol 88#define elf_backend_add_symbol_hook ppc64_elf_add_symbol_hook 89#define elf_backend_check_directives ppc64_elf_check_directives 90#define elf_backend_archive_symbol_lookup ppc64_elf_archive_symbol_lookup 91#define elf_backend_check_relocs ppc64_elf_check_relocs 92#define elf_backend_gc_mark_dynamic_ref ppc64_elf_gc_mark_dynamic_ref 93#define elf_backend_gc_mark_hook ppc64_elf_gc_mark_hook 94#define elf_backend_gc_sweep_hook ppc64_elf_gc_sweep_hook 95#define elf_backend_adjust_dynamic_symbol ppc64_elf_adjust_dynamic_symbol 96#define elf_backend_hide_symbol ppc64_elf_hide_symbol 97#define elf_backend_always_size_sections ppc64_elf_func_desc_adjust 98#define elf_backend_size_dynamic_sections ppc64_elf_size_dynamic_sections 99#define elf_backend_action_discarded ppc64_elf_action_discarded 100#define elf_backend_relocate_section ppc64_elf_relocate_section 101#define elf_backend_finish_dynamic_symbol ppc64_elf_finish_dynamic_symbol 102#define elf_backend_reloc_type_class ppc64_elf_reloc_type_class 103#define elf_backend_finish_dynamic_sections ppc64_elf_finish_dynamic_sections 104#define elf_backend_link_output_symbol_hook ppc64_elf_output_symbol_hook 105#define elf_backend_special_sections ppc64_elf_special_sections 106 107/* The name of the dynamic interpreter. This is put in the .interp 108 section. */ 109#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" 110 111/* The size in bytes of an entry in the procedure linkage table. */ 112#define PLT_ENTRY_SIZE 24 113 114/* The initial size of the plt reserved for the dynamic linker. */ 115#define PLT_INITIAL_ENTRY_SIZE PLT_ENTRY_SIZE 116 117/* TOC base pointers offset from start of TOC. */ 118#define TOC_BASE_OFF 0x8000 119 120/* Offset of tp and dtp pointers from start of TLS block. */ 121#define TP_OFFSET 0x7000 122#define DTP_OFFSET 0x8000 123 124/* .plt call stub instructions. The normal stub is like this, but 125 sometimes the .plt entry crosses a 64k boundary and we need to 126 insert an addis to adjust r12. */ 127#define PLT_CALL_STUB_SIZE (7*4) 128#define ADDIS_R12_R2 0x3d820000 /* addis %r12,%r2,xxx@ha */ 129#define STD_R2_40R1 0xf8410028 /* std %r2,40(%r1) */ 130#define LD_R11_0R12 0xe96c0000 /* ld %r11,xxx+0@l(%r12) */ 131#define LD_R2_0R12 0xe84c0000 /* ld %r2,xxx+8@l(%r12) */ 132#define MTCTR_R11 0x7d6903a6 /* mtctr %r11 */ 133 /* ld %r11,xxx+16@l(%r12) */ 134#define BCTR 0x4e800420 /* bctr */ 135 136 137#define ADDIS_R2_R2 0x3c420000 /* addis %r2,%r2,off@ha */ 138#define ADDI_R2_R2 0x38420000 /* addi %r2,%r2,off@l */ 139 140#define LD_R2_40R1 0xe8410028 /* ld %r2,40(%r1) */ 141 142/* glink call stub instructions. We enter with the index in R0, and the 143 address of glink entry in CTR. From that, we can calculate PLT0. */ 144#define GLINK_CALL_STUB_SIZE (16*4) 145#define MFCTR_R12 0x7d8902a6 /* mfctr %r12 */ 146#define SLDI_R11_R0_3 0x780b1f24 /* sldi %r11,%r0,3 */ 147#define ADDIC_R2_R0_32K 0x34408000 /* addic. %r2,%r0,-32768 */ 148#define SUB_R12_R12_R11 0x7d8b6050 /* sub %r12,%r12,%r11 */ 149#define SRADI_R2_R2_63 0x7c42fe76 /* sradi %r2,%r2,63 */ 150#define SLDI_R11_R0_2 0x780b1764 /* sldi %r11,%r0,2 */ 151#define AND_R2_R2_R11 0x7c425838 /* and %r2,%r2,%r11 */ 152 /* sub %r12,%r12,%r11 */ 153#define ADD_R12_R12_R2 0x7d8c1214 /* add %r12,%r12,%r2 */ 154#define ADDIS_R12_R12 0x3d8c0000 /* addis %r12,%r12,xxx@ha */ 155 /* ld %r11,xxx@l(%r12) */ 156#define ADDI_R12_R12 0x398c0000 /* addi %r12,%r12,xxx@l */ 157 /* ld %r2,8(%r12) */ 158 /* mtctr %r11 */ 159 /* ld %r11,16(%r12) */ 160 /* bctr */ 161 162/* Pad with this. */ 163#define NOP 0x60000000 164 165/* Some other nops. */ 166#define CROR_151515 0x4def7b82 167#define CROR_313131 0x4ffffb82 168 169/* .glink entries for the first 32k functions are two instructions. */ 170#define LI_R0_0 0x38000000 /* li %r0,0 */ 171#define B_DOT 0x48000000 /* b . */ 172 173/* After that, we need two instructions to load the index, followed by 174 a branch. */ 175#define LIS_R0_0 0x3c000000 /* lis %r0,0 */ 176#define ORI_R0_R0_0 0x60000000 /* ori %r0,%r0,0 */ 177 178/* Instructions used by the save and restore reg functions. */ 179#define STD_R0_0R1 0xf8010000 /* std %r0,0(%r1) */ 180#define STD_R0_0R12 0xf80c0000 /* std %r0,0(%r12) */ 181#define LD_R0_0R1 0xe8010000 /* ld %r0,0(%r1) */ 182#define LD_R0_0R12 0xe80c0000 /* ld %r0,0(%r12) */ 183#define STFD_FR0_0R1 0xd8010000 /* stfd %fr0,0(%r1) */ 184#define LFD_FR0_0R1 0xc8010000 /* lfd %fr0,0(%r1) */ 185#define LI_R12_0 0x39800000 /* li %r12,0 */ 186#define STVX_VR0_R12_R0 0x7c0c01ce /* stvx %v0,%r12,%r0 */ 187#define LVX_VR0_R12_R0 0x7c0c00ce /* lvx %v0,%r12,%r0 */ 188#define MTLR_R0 0x7c0803a6 /* mtlr %r0 */ 189#define BLR 0x4e800020 /* blr */ 190 191/* Since .opd is an array of descriptors and each entry will end up 192 with identical R_PPC64_RELATIVE relocs, there is really no need to 193 propagate .opd relocs; The dynamic linker should be taught to 194 relocate .opd without reloc entries. */ 195#ifndef NO_OPD_RELOCS 196#define NO_OPD_RELOCS 0 197#endif 198 199#define ONES(n) (((bfd_vma) 1 << ((n) - 1) << 1) - 1) 200 201/* Relocation HOWTO's. */ 202static reloc_howto_type *ppc64_elf_howto_table[(int) R_PPC64_max]; 203 204static reloc_howto_type ppc64_elf_howto_raw[] = { 205 /* This reloc does nothing. */ 206 HOWTO (R_PPC64_NONE, /* type */ 207 0, /* rightshift */ 208 2, /* size (0 = byte, 1 = short, 2 = long) */ 209 32, /* bitsize */ 210 FALSE, /* pc_relative */ 211 0, /* bitpos */ 212 complain_overflow_dont, /* complain_on_overflow */ 213 bfd_elf_generic_reloc, /* special_function */ 214 "R_PPC64_NONE", /* name */ 215 FALSE, /* partial_inplace */ 216 0, /* src_mask */ 217 0, /* dst_mask */ 218 FALSE), /* pcrel_offset */ 219 220 /* A standard 32 bit relocation. */ 221 HOWTO (R_PPC64_ADDR32, /* type */ 222 0, /* rightshift */ 223 2, /* size (0 = byte, 1 = short, 2 = long) */ 224 32, /* bitsize */ 225 FALSE, /* pc_relative */ 226 0, /* bitpos */ 227 complain_overflow_bitfield, /* complain_on_overflow */ 228 bfd_elf_generic_reloc, /* special_function */ 229 "R_PPC64_ADDR32", /* name */ 230 FALSE, /* partial_inplace */ 231 0, /* src_mask */ 232 0xffffffff, /* dst_mask */ 233 FALSE), /* pcrel_offset */ 234 235 /* An absolute 26 bit branch; the lower two bits must be zero. 236 FIXME: we don't check that, we just clear them. */ 237 HOWTO (R_PPC64_ADDR24, /* type */ 238 0, /* rightshift */ 239 2, /* size (0 = byte, 1 = short, 2 = long) */ 240 26, /* bitsize */ 241 FALSE, /* pc_relative */ 242 0, /* bitpos */ 243 complain_overflow_bitfield, /* complain_on_overflow */ 244 bfd_elf_generic_reloc, /* special_function */ 245 "R_PPC64_ADDR24", /* name */ 246 FALSE, /* partial_inplace */ 247 0, /* src_mask */ 248 0x03fffffc, /* dst_mask */ 249 FALSE), /* pcrel_offset */ 250 251 /* A standard 16 bit relocation. */ 252 HOWTO (R_PPC64_ADDR16, /* type */ 253 0, /* rightshift */ 254 1, /* size (0 = byte, 1 = short, 2 = long) */ 255 16, /* bitsize */ 256 FALSE, /* pc_relative */ 257 0, /* bitpos */ 258 complain_overflow_bitfield, /* complain_on_overflow */ 259 bfd_elf_generic_reloc, /* special_function */ 260 "R_PPC64_ADDR16", /* name */ 261 FALSE, /* partial_inplace */ 262 0, /* src_mask */ 263 0xffff, /* dst_mask */ 264 FALSE), /* pcrel_offset */ 265 266 /* A 16 bit relocation without overflow. */ 267 HOWTO (R_PPC64_ADDR16_LO, /* type */ 268 0, /* rightshift */ 269 1, /* size (0 = byte, 1 = short, 2 = long) */ 270 16, /* bitsize */ 271 FALSE, /* pc_relative */ 272 0, /* bitpos */ 273 complain_overflow_dont,/* complain_on_overflow */ 274 bfd_elf_generic_reloc, /* special_function */ 275 "R_PPC64_ADDR16_LO", /* name */ 276 FALSE, /* partial_inplace */ 277 0, /* src_mask */ 278 0xffff, /* dst_mask */ 279 FALSE), /* pcrel_offset */ 280 281 /* Bits 16-31 of an address. */ 282 HOWTO (R_PPC64_ADDR16_HI, /* type */ 283 16, /* rightshift */ 284 1, /* size (0 = byte, 1 = short, 2 = long) */ 285 16, /* bitsize */ 286 FALSE, /* pc_relative */ 287 0, /* bitpos */ 288 complain_overflow_dont, /* complain_on_overflow */ 289 bfd_elf_generic_reloc, /* special_function */ 290 "R_PPC64_ADDR16_HI", /* name */ 291 FALSE, /* partial_inplace */ 292 0, /* src_mask */ 293 0xffff, /* dst_mask */ 294 FALSE), /* pcrel_offset */ 295 296 /* Bits 16-31 of an address, plus 1 if the contents of the low 16 297 bits, treated as a signed number, is negative. */ 298 HOWTO (R_PPC64_ADDR16_HA, /* type */ 299 16, /* rightshift */ 300 1, /* size (0 = byte, 1 = short, 2 = long) */ 301 16, /* bitsize */ 302 FALSE, /* pc_relative */ 303 0, /* bitpos */ 304 complain_overflow_dont, /* complain_on_overflow */ 305 ppc64_elf_ha_reloc, /* special_function */ 306 "R_PPC64_ADDR16_HA", /* name */ 307 FALSE, /* partial_inplace */ 308 0, /* src_mask */ 309 0xffff, /* dst_mask */ 310 FALSE), /* pcrel_offset */ 311 312 /* An absolute 16 bit branch; the lower two bits must be zero. 313 FIXME: we don't check that, we just clear them. */ 314 HOWTO (R_PPC64_ADDR14, /* type */ 315 0, /* rightshift */ 316 2, /* size (0 = byte, 1 = short, 2 = long) */ 317 16, /* bitsize */ 318 FALSE, /* pc_relative */ 319 0, /* bitpos */ 320 complain_overflow_bitfield, /* complain_on_overflow */ 321 ppc64_elf_branch_reloc, /* special_function */ 322 "R_PPC64_ADDR14", /* name */ 323 FALSE, /* partial_inplace */ 324 0, /* src_mask */ 325 0x0000fffc, /* dst_mask */ 326 FALSE), /* pcrel_offset */ 327 328 /* An absolute 16 bit branch, for which bit 10 should be set to 329 indicate that the branch is expected to be taken. The lower two 330 bits must be zero. */ 331 HOWTO (R_PPC64_ADDR14_BRTAKEN, /* type */ 332 0, /* rightshift */ 333 2, /* size (0 = byte, 1 = short, 2 = long) */ 334 16, /* bitsize */ 335 FALSE, /* pc_relative */ 336 0, /* bitpos */ 337 complain_overflow_bitfield, /* complain_on_overflow */ 338 ppc64_elf_brtaken_reloc, /* special_function */ 339 "R_PPC64_ADDR14_BRTAKEN",/* name */ 340 FALSE, /* partial_inplace */ 341 0, /* src_mask */ 342 0x0000fffc, /* dst_mask */ 343 FALSE), /* pcrel_offset */ 344 345 /* An absolute 16 bit branch, for which bit 10 should be set to 346 indicate that the branch is not expected to be taken. The lower 347 two bits must be zero. */ 348 HOWTO (R_PPC64_ADDR14_BRNTAKEN, /* type */ 349 0, /* rightshift */ 350 2, /* size (0 = byte, 1 = short, 2 = long) */ 351 16, /* bitsize */ 352 FALSE, /* pc_relative */ 353 0, /* bitpos */ 354 complain_overflow_bitfield, /* complain_on_overflow */ 355 ppc64_elf_brtaken_reloc, /* special_function */ 356 "R_PPC64_ADDR14_BRNTAKEN",/* name */ 357 FALSE, /* partial_inplace */ 358 0, /* src_mask */ 359 0x0000fffc, /* dst_mask */ 360 FALSE), /* pcrel_offset */ 361 362 /* A relative 26 bit branch; the lower two bits must be zero. */ 363 HOWTO (R_PPC64_REL24, /* type */ 364 0, /* rightshift */ 365 2, /* size (0 = byte, 1 = short, 2 = long) */ 366 26, /* bitsize */ 367 TRUE, /* pc_relative */ 368 0, /* bitpos */ 369 complain_overflow_signed, /* complain_on_overflow */ 370 ppc64_elf_branch_reloc, /* special_function */ 371 "R_PPC64_REL24", /* name */ 372 FALSE, /* partial_inplace */ 373 0, /* src_mask */ 374 0x03fffffc, /* dst_mask */ 375 TRUE), /* pcrel_offset */ 376 377 /* A relative 16 bit branch; the lower two bits must be zero. */ 378 HOWTO (R_PPC64_REL14, /* type */ 379 0, /* rightshift */ 380 2, /* size (0 = byte, 1 = short, 2 = long) */ 381 16, /* bitsize */ 382 TRUE, /* pc_relative */ 383 0, /* bitpos */ 384 complain_overflow_signed, /* complain_on_overflow */ 385 ppc64_elf_branch_reloc, /* special_function */ 386 "R_PPC64_REL14", /* name */ 387 FALSE, /* partial_inplace */ 388 0, /* src_mask */ 389 0x0000fffc, /* dst_mask */ 390 TRUE), /* pcrel_offset */ 391 392 /* A relative 16 bit branch. Bit 10 should be set to indicate that 393 the branch is expected to be taken. The lower two bits must be 394 zero. */ 395 HOWTO (R_PPC64_REL14_BRTAKEN, /* type */ 396 0, /* rightshift */ 397 2, /* size (0 = byte, 1 = short, 2 = long) */ 398 16, /* bitsize */ 399 TRUE, /* pc_relative */ 400 0, /* bitpos */ 401 complain_overflow_signed, /* complain_on_overflow */ 402 ppc64_elf_brtaken_reloc, /* special_function */ 403 "R_PPC64_REL14_BRTAKEN", /* name */ 404 FALSE, /* partial_inplace */ 405 0, /* src_mask */ 406 0x0000fffc, /* dst_mask */ 407 TRUE), /* pcrel_offset */ 408 409 /* A relative 16 bit branch. Bit 10 should be set to indicate that 410 the branch is not expected to be taken. The lower two bits must 411 be zero. */ 412 HOWTO (R_PPC64_REL14_BRNTAKEN, /* type */ 413 0, /* rightshift */ 414 2, /* size (0 = byte, 1 = short, 2 = long) */ 415 16, /* bitsize */ 416 TRUE, /* pc_relative */ 417 0, /* bitpos */ 418 complain_overflow_signed, /* complain_on_overflow */ 419 ppc64_elf_brtaken_reloc, /* special_function */ 420 "R_PPC64_REL14_BRNTAKEN",/* name */ 421 FALSE, /* partial_inplace */ 422 0, /* src_mask */ 423 0x0000fffc, /* dst_mask */ 424 TRUE), /* pcrel_offset */ 425 426 /* Like R_PPC64_ADDR16, but referring to the GOT table entry for the 427 symbol. */ 428 HOWTO (R_PPC64_GOT16, /* type */ 429 0, /* rightshift */ 430 1, /* size (0 = byte, 1 = short, 2 = long) */ 431 16, /* bitsize */ 432 FALSE, /* pc_relative */ 433 0, /* bitpos */ 434 complain_overflow_signed, /* complain_on_overflow */ 435 ppc64_elf_unhandled_reloc, /* special_function */ 436 "R_PPC64_GOT16", /* name */ 437 FALSE, /* partial_inplace */ 438 0, /* src_mask */ 439 0xffff, /* dst_mask */ 440 FALSE), /* pcrel_offset */ 441 442 /* Like R_PPC64_ADDR16_LO, but referring to the GOT table entry for 443 the symbol. */ 444 HOWTO (R_PPC64_GOT16_LO, /* type */ 445 0, /* rightshift */ 446 1, /* size (0 = byte, 1 = short, 2 = long) */ 447 16, /* bitsize */ 448 FALSE, /* pc_relative */ 449 0, /* bitpos */ 450 complain_overflow_dont, /* complain_on_overflow */ 451 ppc64_elf_unhandled_reloc, /* special_function */ 452 "R_PPC64_GOT16_LO", /* name */ 453 FALSE, /* partial_inplace */ 454 0, /* src_mask */ 455 0xffff, /* dst_mask */ 456 FALSE), /* pcrel_offset */ 457 458 /* Like R_PPC64_ADDR16_HI, but referring to the GOT table entry for 459 the symbol. */ 460 HOWTO (R_PPC64_GOT16_HI, /* type */ 461 16, /* rightshift */ 462 1, /* size (0 = byte, 1 = short, 2 = long) */ 463 16, /* bitsize */ 464 FALSE, /* pc_relative */ 465 0, /* bitpos */ 466 complain_overflow_dont,/* complain_on_overflow */ 467 ppc64_elf_unhandled_reloc, /* special_function */ 468 "R_PPC64_GOT16_HI", /* name */ 469 FALSE, /* partial_inplace */ 470 0, /* src_mask */ 471 0xffff, /* dst_mask */ 472 FALSE), /* pcrel_offset */ 473 474 /* Like R_PPC64_ADDR16_HA, but referring to the GOT table entry for 475 the symbol. */ 476 HOWTO (R_PPC64_GOT16_HA, /* type */ 477 16, /* rightshift */ 478 1, /* size (0 = byte, 1 = short, 2 = long) */ 479 16, /* bitsize */ 480 FALSE, /* pc_relative */ 481 0, /* bitpos */ 482 complain_overflow_dont,/* complain_on_overflow */ 483 ppc64_elf_unhandled_reloc, /* special_function */ 484 "R_PPC64_GOT16_HA", /* name */ 485 FALSE, /* partial_inplace */ 486 0, /* src_mask */ 487 0xffff, /* dst_mask */ 488 FALSE), /* pcrel_offset */ 489 490 /* This is used only by the dynamic linker. The symbol should exist 491 both in the object being run and in some shared library. The 492 dynamic linker copies the data addressed by the symbol from the 493 shared library into the object, because the object being 494 run has to have the data at some particular address. */ 495 HOWTO (R_PPC64_COPY, /* type */ 496 0, /* rightshift */ 497 0, /* this one is variable size */ 498 0, /* bitsize */ 499 FALSE, /* pc_relative */ 500 0, /* bitpos */ 501 complain_overflow_dont, /* complain_on_overflow */ 502 ppc64_elf_unhandled_reloc, /* special_function */ 503 "R_PPC64_COPY", /* name */ 504 FALSE, /* partial_inplace */ 505 0, /* src_mask */ 506 0, /* dst_mask */ 507 FALSE), /* pcrel_offset */ 508 509 /* Like R_PPC64_ADDR64, but used when setting global offset table 510 entries. */ 511 HOWTO (R_PPC64_GLOB_DAT, /* type */ 512 0, /* rightshift */ 513 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 514 64, /* bitsize */ 515 FALSE, /* pc_relative */ 516 0, /* bitpos */ 517 complain_overflow_dont, /* complain_on_overflow */ 518 ppc64_elf_unhandled_reloc, /* special_function */ 519 "R_PPC64_GLOB_DAT", /* name */ 520 FALSE, /* partial_inplace */ 521 0, /* src_mask */ 522 ONES (64), /* dst_mask */ 523 FALSE), /* pcrel_offset */ 524 525 /* Created by the link editor. Marks a procedure linkage table 526 entry for a symbol. */ 527 HOWTO (R_PPC64_JMP_SLOT, /* type */ 528 0, /* rightshift */ 529 0, /* size (0 = byte, 1 = short, 2 = long) */ 530 0, /* bitsize */ 531 FALSE, /* pc_relative */ 532 0, /* bitpos */ 533 complain_overflow_dont, /* complain_on_overflow */ 534 ppc64_elf_unhandled_reloc, /* special_function */ 535 "R_PPC64_JMP_SLOT", /* name */ 536 FALSE, /* partial_inplace */ 537 0, /* src_mask */ 538 0, /* dst_mask */ 539 FALSE), /* pcrel_offset */ 540 541 /* Used only by the dynamic linker. When the object is run, this 542 doubleword64 is set to the load address of the object, plus the 543 addend. */ 544 HOWTO (R_PPC64_RELATIVE, /* type */ 545 0, /* rightshift */ 546 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 547 64, /* bitsize */ 548 FALSE, /* pc_relative */ 549 0, /* bitpos */ 550 complain_overflow_dont, /* complain_on_overflow */ 551 bfd_elf_generic_reloc, /* special_function */ 552 "R_PPC64_RELATIVE", /* name */ 553 FALSE, /* partial_inplace */ 554 0, /* src_mask */ 555 ONES (64), /* dst_mask */ 556 FALSE), /* pcrel_offset */ 557 558 /* Like R_PPC64_ADDR32, but may be unaligned. */ 559 HOWTO (R_PPC64_UADDR32, /* type */ 560 0, /* rightshift */ 561 2, /* size (0 = byte, 1 = short, 2 = long) */ 562 32, /* bitsize */ 563 FALSE, /* pc_relative */ 564 0, /* bitpos */ 565 complain_overflow_bitfield, /* complain_on_overflow */ 566 bfd_elf_generic_reloc, /* special_function */ 567 "R_PPC64_UADDR32", /* name */ 568 FALSE, /* partial_inplace */ 569 0, /* src_mask */ 570 0xffffffff, /* dst_mask */ 571 FALSE), /* pcrel_offset */ 572 573 /* Like R_PPC64_ADDR16, but may be unaligned. */ 574 HOWTO (R_PPC64_UADDR16, /* type */ 575 0, /* rightshift */ 576 1, /* size (0 = byte, 1 = short, 2 = long) */ 577 16, /* bitsize */ 578 FALSE, /* pc_relative */ 579 0, /* bitpos */ 580 complain_overflow_bitfield, /* complain_on_overflow */ 581 bfd_elf_generic_reloc, /* special_function */ 582 "R_PPC64_UADDR16", /* name */ 583 FALSE, /* partial_inplace */ 584 0, /* src_mask */ 585 0xffff, /* dst_mask */ 586 FALSE), /* pcrel_offset */ 587 588 /* 32-bit PC relative. */ 589 HOWTO (R_PPC64_REL32, /* type */ 590 0, /* rightshift */ 591 2, /* size (0 = byte, 1 = short, 2 = long) */ 592 32, /* bitsize */ 593 TRUE, /* pc_relative */ 594 0, /* bitpos */ 595 /* FIXME: Verify. Was complain_overflow_bitfield. */ 596 complain_overflow_signed, /* complain_on_overflow */ 597 bfd_elf_generic_reloc, /* special_function */ 598 "R_PPC64_REL32", /* name */ 599 FALSE, /* partial_inplace */ 600 0, /* src_mask */ 601 0xffffffff, /* dst_mask */ 602 TRUE), /* pcrel_offset */ 603 604 /* 32-bit relocation to the symbol's procedure linkage table. */ 605 HOWTO (R_PPC64_PLT32, /* type */ 606 0, /* rightshift */ 607 2, /* size (0 = byte, 1 = short, 2 = long) */ 608 32, /* bitsize */ 609 FALSE, /* pc_relative */ 610 0, /* bitpos */ 611 complain_overflow_bitfield, /* complain_on_overflow */ 612 ppc64_elf_unhandled_reloc, /* special_function */ 613 "R_PPC64_PLT32", /* name */ 614 FALSE, /* partial_inplace */ 615 0, /* src_mask */ 616 0xffffffff, /* dst_mask */ 617 FALSE), /* pcrel_offset */ 618 619 /* 32-bit PC relative relocation to the symbol's procedure linkage table. 620 FIXME: R_PPC64_PLTREL32 not supported. */ 621 HOWTO (R_PPC64_PLTREL32, /* type */ 622 0, /* rightshift */ 623 2, /* size (0 = byte, 1 = short, 2 = long) */ 624 32, /* bitsize */ 625 TRUE, /* pc_relative */ 626 0, /* bitpos */ 627 complain_overflow_signed, /* complain_on_overflow */ 628 bfd_elf_generic_reloc, /* special_function */ 629 "R_PPC64_PLTREL32", /* name */ 630 FALSE, /* partial_inplace */ 631 0, /* src_mask */ 632 0xffffffff, /* dst_mask */ 633 TRUE), /* pcrel_offset */ 634 635 /* Like R_PPC64_ADDR16_LO, but referring to the PLT table entry for 636 the symbol. */ 637 HOWTO (R_PPC64_PLT16_LO, /* type */ 638 0, /* rightshift */ 639 1, /* size (0 = byte, 1 = short, 2 = long) */ 640 16, /* bitsize */ 641 FALSE, /* pc_relative */ 642 0, /* bitpos */ 643 complain_overflow_dont, /* complain_on_overflow */ 644 ppc64_elf_unhandled_reloc, /* special_function */ 645 "R_PPC64_PLT16_LO", /* name */ 646 FALSE, /* partial_inplace */ 647 0, /* src_mask */ 648 0xffff, /* dst_mask */ 649 FALSE), /* pcrel_offset */ 650 651 /* Like R_PPC64_ADDR16_HI, but referring to the PLT table entry for 652 the symbol. */ 653 HOWTO (R_PPC64_PLT16_HI, /* type */ 654 16, /* rightshift */ 655 1, /* size (0 = byte, 1 = short, 2 = long) */ 656 16, /* bitsize */ 657 FALSE, /* pc_relative */ 658 0, /* bitpos */ 659 complain_overflow_dont, /* complain_on_overflow */ 660 ppc64_elf_unhandled_reloc, /* special_function */ 661 "R_PPC64_PLT16_HI", /* name */ 662 FALSE, /* partial_inplace */ 663 0, /* src_mask */ 664 0xffff, /* dst_mask */ 665 FALSE), /* pcrel_offset */ 666 667 /* Like R_PPC64_ADDR16_HA, but referring to the PLT table entry for 668 the symbol. */ 669 HOWTO (R_PPC64_PLT16_HA, /* type */ 670 16, /* rightshift */ 671 1, /* size (0 = byte, 1 = short, 2 = long) */ 672 16, /* bitsize */ 673 FALSE, /* pc_relative */ 674 0, /* bitpos */ 675 complain_overflow_dont, /* complain_on_overflow */ 676 ppc64_elf_unhandled_reloc, /* special_function */ 677 "R_PPC64_PLT16_HA", /* name */ 678 FALSE, /* partial_inplace */ 679 0, /* src_mask */ 680 0xffff, /* dst_mask */ 681 FALSE), /* pcrel_offset */ 682 683 /* 16-bit section relative relocation. */ 684 HOWTO (R_PPC64_SECTOFF, /* type */ 685 0, /* rightshift */ 686 1, /* size (0 = byte, 1 = short, 2 = long) */ 687 16, /* bitsize */ 688 FALSE, /* pc_relative */ 689 0, /* bitpos */ 690 complain_overflow_bitfield, /* complain_on_overflow */ 691 ppc64_elf_sectoff_reloc, /* special_function */ 692 "R_PPC64_SECTOFF", /* name */ 693 FALSE, /* partial_inplace */ 694 0, /* src_mask */ 695 0xffff, /* dst_mask */ 696 FALSE), /* pcrel_offset */ 697 698 /* Like R_PPC64_SECTOFF, but no overflow warning. */ 699 HOWTO (R_PPC64_SECTOFF_LO, /* type */ 700 0, /* rightshift */ 701 1, /* size (0 = byte, 1 = short, 2 = long) */ 702 16, /* bitsize */ 703 FALSE, /* pc_relative */ 704 0, /* bitpos */ 705 complain_overflow_dont, /* complain_on_overflow */ 706 ppc64_elf_sectoff_reloc, /* special_function */ 707 "R_PPC64_SECTOFF_LO", /* name */ 708 FALSE, /* partial_inplace */ 709 0, /* src_mask */ 710 0xffff, /* dst_mask */ 711 FALSE), /* pcrel_offset */ 712 713 /* 16-bit upper half section relative relocation. */ 714 HOWTO (R_PPC64_SECTOFF_HI, /* type */ 715 16, /* rightshift */ 716 1, /* size (0 = byte, 1 = short, 2 = long) */ 717 16, /* bitsize */ 718 FALSE, /* pc_relative */ 719 0, /* bitpos */ 720 complain_overflow_dont, /* complain_on_overflow */ 721 ppc64_elf_sectoff_reloc, /* special_function */ 722 "R_PPC64_SECTOFF_HI", /* name */ 723 FALSE, /* partial_inplace */ 724 0, /* src_mask */ 725 0xffff, /* dst_mask */ 726 FALSE), /* pcrel_offset */ 727 728 /* 16-bit upper half adjusted section relative relocation. */ 729 HOWTO (R_PPC64_SECTOFF_HA, /* type */ 730 16, /* rightshift */ 731 1, /* size (0 = byte, 1 = short, 2 = long) */ 732 16, /* bitsize */ 733 FALSE, /* pc_relative */ 734 0, /* bitpos */ 735 complain_overflow_dont, /* complain_on_overflow */ 736 ppc64_elf_sectoff_ha_reloc, /* special_function */ 737 "R_PPC64_SECTOFF_HA", /* name */ 738 FALSE, /* partial_inplace */ 739 0, /* src_mask */ 740 0xffff, /* dst_mask */ 741 FALSE), /* pcrel_offset */ 742 743 /* Like R_PPC64_REL24 without touching the two least significant bits. */ 744 HOWTO (R_PPC64_REL30, /* type */ 745 2, /* rightshift */ 746 2, /* size (0 = byte, 1 = short, 2 = long) */ 747 30, /* bitsize */ 748 TRUE, /* pc_relative */ 749 0, /* bitpos */ 750 complain_overflow_dont, /* complain_on_overflow */ 751 bfd_elf_generic_reloc, /* special_function */ 752 "R_PPC64_REL30", /* name */ 753 FALSE, /* partial_inplace */ 754 0, /* src_mask */ 755 0xfffffffc, /* dst_mask */ 756 TRUE), /* pcrel_offset */ 757 758 /* Relocs in the 64-bit PowerPC ELF ABI, not in the 32-bit ABI. */ 759 760 /* A standard 64-bit relocation. */ 761 HOWTO (R_PPC64_ADDR64, /* type */ 762 0, /* rightshift */ 763 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 764 64, /* bitsize */ 765 FALSE, /* pc_relative */ 766 0, /* bitpos */ 767 complain_overflow_dont, /* complain_on_overflow */ 768 bfd_elf_generic_reloc, /* special_function */ 769 "R_PPC64_ADDR64", /* name */ 770 FALSE, /* partial_inplace */ 771 0, /* src_mask */ 772 ONES (64), /* dst_mask */ 773 FALSE), /* pcrel_offset */ 774 775 /* The bits 32-47 of an address. */ 776 HOWTO (R_PPC64_ADDR16_HIGHER, /* type */ 777 32, /* rightshift */ 778 1, /* size (0 = byte, 1 = short, 2 = long) */ 779 16, /* bitsize */ 780 FALSE, /* pc_relative */ 781 0, /* bitpos */ 782 complain_overflow_dont, /* complain_on_overflow */ 783 bfd_elf_generic_reloc, /* special_function */ 784 "R_PPC64_ADDR16_HIGHER", /* name */ 785 FALSE, /* partial_inplace */ 786 0, /* src_mask */ 787 0xffff, /* dst_mask */ 788 FALSE), /* pcrel_offset */ 789 790 /* The bits 32-47 of an address, plus 1 if the contents of the low 791 16 bits, treated as a signed number, is negative. */ 792 HOWTO (R_PPC64_ADDR16_HIGHERA, /* type */ 793 32, /* rightshift */ 794 1, /* size (0 = byte, 1 = short, 2 = long) */ 795 16, /* bitsize */ 796 FALSE, /* pc_relative */ 797 0, /* bitpos */ 798 complain_overflow_dont, /* complain_on_overflow */ 799 ppc64_elf_ha_reloc, /* special_function */ 800 "R_PPC64_ADDR16_HIGHERA", /* name */ 801 FALSE, /* partial_inplace */ 802 0, /* src_mask */ 803 0xffff, /* dst_mask */ 804 FALSE), /* pcrel_offset */ 805 806 /* The bits 48-63 of an address. */ 807 HOWTO (R_PPC64_ADDR16_HIGHEST,/* type */ 808 48, /* rightshift */ 809 1, /* size (0 = byte, 1 = short, 2 = long) */ 810 16, /* bitsize */ 811 FALSE, /* pc_relative */ 812 0, /* bitpos */ 813 complain_overflow_dont, /* complain_on_overflow */ 814 bfd_elf_generic_reloc, /* special_function */ 815 "R_PPC64_ADDR16_HIGHEST", /* name */ 816 FALSE, /* partial_inplace */ 817 0, /* src_mask */ 818 0xffff, /* dst_mask */ 819 FALSE), /* pcrel_offset */ 820 821 /* The bits 48-63 of an address, plus 1 if the contents of the low 822 16 bits, treated as a signed number, is negative. */ 823 HOWTO (R_PPC64_ADDR16_HIGHESTA,/* type */ 824 48, /* rightshift */ 825 1, /* size (0 = byte, 1 = short, 2 = long) */ 826 16, /* bitsize */ 827 FALSE, /* pc_relative */ 828 0, /* bitpos */ 829 complain_overflow_dont, /* complain_on_overflow */ 830 ppc64_elf_ha_reloc, /* special_function */ 831 "R_PPC64_ADDR16_HIGHESTA", /* name */ 832 FALSE, /* partial_inplace */ 833 0, /* src_mask */ 834 0xffff, /* dst_mask */ 835 FALSE), /* pcrel_offset */ 836 837 /* Like ADDR64, but may be unaligned. */ 838 HOWTO (R_PPC64_UADDR64, /* type */ 839 0, /* rightshift */ 840 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 841 64, /* bitsize */ 842 FALSE, /* pc_relative */ 843 0, /* bitpos */ 844 complain_overflow_dont, /* complain_on_overflow */ 845 bfd_elf_generic_reloc, /* special_function */ 846 "R_PPC64_UADDR64", /* name */ 847 FALSE, /* partial_inplace */ 848 0, /* src_mask */ 849 ONES (64), /* dst_mask */ 850 FALSE), /* pcrel_offset */ 851 852 /* 64-bit relative relocation. */ 853 HOWTO (R_PPC64_REL64, /* type */ 854 0, /* rightshift */ 855 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 856 64, /* bitsize */ 857 TRUE, /* pc_relative */ 858 0, /* bitpos */ 859 complain_overflow_dont, /* complain_on_overflow */ 860 bfd_elf_generic_reloc, /* special_function */ 861 "R_PPC64_REL64", /* name */ 862 FALSE, /* partial_inplace */ 863 0, /* src_mask */ 864 ONES (64), /* dst_mask */ 865 TRUE), /* pcrel_offset */ 866 867 /* 64-bit relocation to the symbol's procedure linkage table. */ 868 HOWTO (R_PPC64_PLT64, /* type */ 869 0, /* rightshift */ 870 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 871 64, /* bitsize */ 872 FALSE, /* pc_relative */ 873 0, /* bitpos */ 874 complain_overflow_dont, /* complain_on_overflow */ 875 ppc64_elf_unhandled_reloc, /* special_function */ 876 "R_PPC64_PLT64", /* name */ 877 FALSE, /* partial_inplace */ 878 0, /* src_mask */ 879 ONES (64), /* dst_mask */ 880 FALSE), /* pcrel_offset */ 881 882 /* 64-bit PC relative relocation to the symbol's procedure linkage 883 table. */ 884 /* FIXME: R_PPC64_PLTREL64 not supported. */ 885 HOWTO (R_PPC64_PLTREL64, /* type */ 886 0, /* rightshift */ 887 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 888 64, /* bitsize */ 889 TRUE, /* pc_relative */ 890 0, /* bitpos */ 891 complain_overflow_dont, /* complain_on_overflow */ 892 ppc64_elf_unhandled_reloc, /* special_function */ 893 "R_PPC64_PLTREL64", /* name */ 894 FALSE, /* partial_inplace */ 895 0, /* src_mask */ 896 ONES (64), /* dst_mask */ 897 TRUE), /* pcrel_offset */ 898 899 /* 16 bit TOC-relative relocation. */ 900 901 /* R_PPC64_TOC16 47 half16* S + A - .TOC. */ 902 HOWTO (R_PPC64_TOC16, /* type */ 903 0, /* rightshift */ 904 1, /* size (0 = byte, 1 = short, 2 = long) */ 905 16, /* bitsize */ 906 FALSE, /* pc_relative */ 907 0, /* bitpos */ 908 complain_overflow_signed, /* complain_on_overflow */ 909 ppc64_elf_toc_reloc, /* special_function */ 910 "R_PPC64_TOC16", /* name */ 911 FALSE, /* partial_inplace */ 912 0, /* src_mask */ 913 0xffff, /* dst_mask */ 914 FALSE), /* pcrel_offset */ 915 916 /* 16 bit TOC-relative relocation without overflow. */ 917 918 /* R_PPC64_TOC16_LO 48 half16 #lo (S + A - .TOC.) */ 919 HOWTO (R_PPC64_TOC16_LO, /* type */ 920 0, /* rightshift */ 921 1, /* size (0 = byte, 1 = short, 2 = long) */ 922 16, /* bitsize */ 923 FALSE, /* pc_relative */ 924 0, /* bitpos */ 925 complain_overflow_dont, /* complain_on_overflow */ 926 ppc64_elf_toc_reloc, /* special_function */ 927 "R_PPC64_TOC16_LO", /* name */ 928 FALSE, /* partial_inplace */ 929 0, /* src_mask */ 930 0xffff, /* dst_mask */ 931 FALSE), /* pcrel_offset */ 932 933 /* 16 bit TOC-relative relocation, high 16 bits. */ 934 935 /* R_PPC64_TOC16_HI 49 half16 #hi (S + A - .TOC.) */ 936 HOWTO (R_PPC64_TOC16_HI, /* type */ 937 16, /* rightshift */ 938 1, /* size (0 = byte, 1 = short, 2 = long) */ 939 16, /* bitsize */ 940 FALSE, /* pc_relative */ 941 0, /* bitpos */ 942 complain_overflow_dont, /* complain_on_overflow */ 943 ppc64_elf_toc_reloc, /* special_function */ 944 "R_PPC64_TOC16_HI", /* name */ 945 FALSE, /* partial_inplace */ 946 0, /* src_mask */ 947 0xffff, /* dst_mask */ 948 FALSE), /* pcrel_offset */ 949 950 /* 16 bit TOC-relative relocation, high 16 bits, plus 1 if the 951 contents of the low 16 bits, treated as a signed number, is 952 negative. */ 953 954 /* R_PPC64_TOC16_HA 50 half16 #ha (S + A - .TOC.) */ 955 HOWTO (R_PPC64_TOC16_HA, /* type */ 956 16, /* rightshift */ 957 1, /* size (0 = byte, 1 = short, 2 = long) */ 958 16, /* bitsize */ 959 FALSE, /* pc_relative */ 960 0, /* bitpos */ 961 complain_overflow_dont, /* complain_on_overflow */ 962 ppc64_elf_toc_ha_reloc, /* special_function */ 963 "R_PPC64_TOC16_HA", /* name */ 964 FALSE, /* partial_inplace */ 965 0, /* src_mask */ 966 0xffff, /* dst_mask */ 967 FALSE), /* pcrel_offset */ 968 969 /* 64-bit relocation; insert value of TOC base (.TOC.). */ 970 971 /* R_PPC64_TOC 51 doubleword64 .TOC. */ 972 HOWTO (R_PPC64_TOC, /* type */ 973 0, /* rightshift */ 974 4, /* size (0=byte, 1=short, 2=long, 4=64 bits) */ 975 64, /* bitsize */ 976 FALSE, /* pc_relative */ 977 0, /* bitpos */ 978 complain_overflow_bitfield, /* complain_on_overflow */ 979 ppc64_elf_toc64_reloc, /* special_function */ 980 "R_PPC64_TOC", /* name */ 981 FALSE, /* partial_inplace */ 982 0, /* src_mask */ 983 ONES (64), /* dst_mask */ 984 FALSE), /* pcrel_offset */ 985 986 /* Like R_PPC64_GOT16, but also informs the link editor that the 987 value to relocate may (!) refer to a PLT entry which the link 988 editor (a) may replace with the symbol value. If the link editor 989 is unable to fully resolve the symbol, it may (b) create a PLT 990 entry and store the address to the new PLT entry in the GOT. 991 This permits lazy resolution of function symbols at run time. 992 The link editor may also skip all of this and just (c) emit a 993 R_PPC64_GLOB_DAT to tie the symbol to the GOT entry. */ 994 /* FIXME: R_PPC64_PLTGOT16 not implemented. */ 995 HOWTO (R_PPC64_PLTGOT16, /* type */ 996 0, /* rightshift */ 997 1, /* size (0 = byte, 1 = short, 2 = long) */ 998 16, /* bitsize */ 999 FALSE, /* pc_relative */ 1000 0, /* bitpos */ 1001 complain_overflow_signed, /* complain_on_overflow */ 1002 ppc64_elf_unhandled_reloc, /* special_function */ 1003 "R_PPC64_PLTGOT16", /* name */ 1004 FALSE, /* partial_inplace */ 1005 0, /* src_mask */ 1006 0xffff, /* dst_mask */ 1007 FALSE), /* pcrel_offset */ 1008 1009 /* Like R_PPC64_PLTGOT16, but without overflow. */ 1010 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */ 1011 HOWTO (R_PPC64_PLTGOT16_LO, /* type */ 1012 0, /* rightshift */ 1013 1, /* size (0 = byte, 1 = short, 2 = long) */ 1014 16, /* bitsize */ 1015 FALSE, /* pc_relative */ 1016 0, /* bitpos */ 1017 complain_overflow_dont, /* complain_on_overflow */ 1018 ppc64_elf_unhandled_reloc, /* special_function */ 1019 "R_PPC64_PLTGOT16_LO", /* name */ 1020 FALSE, /* partial_inplace */ 1021 0, /* src_mask */ 1022 0xffff, /* dst_mask */ 1023 FALSE), /* pcrel_offset */ 1024 1025 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address. */ 1026 /* FIXME: R_PPC64_PLTGOT16_HI not implemented. */ 1027 HOWTO (R_PPC64_PLTGOT16_HI, /* type */ 1028 16, /* rightshift */ 1029 1, /* size (0 = byte, 1 = short, 2 = long) */ 1030 16, /* bitsize */ 1031 FALSE, /* pc_relative */ 1032 0, /* bitpos */ 1033 complain_overflow_dont, /* complain_on_overflow */ 1034 ppc64_elf_unhandled_reloc, /* special_function */ 1035 "R_PPC64_PLTGOT16_HI", /* name */ 1036 FALSE, /* partial_inplace */ 1037 0, /* src_mask */ 1038 0xffff, /* dst_mask */ 1039 FALSE), /* pcrel_offset */ 1040 1041 /* Like R_PPC64_PLT_GOT16, but using bits 16-31 of the address, plus 1042 1 if the contents of the low 16 bits, treated as a signed number, 1043 is negative. */ 1044 /* FIXME: R_PPC64_PLTGOT16_HA not implemented. */ 1045 HOWTO (R_PPC64_PLTGOT16_HA, /* type */ 1046 16, /* rightshift */ 1047 1, /* size (0 = byte, 1 = short, 2 = long) */ 1048 16, /* bitsize */ 1049 FALSE, /* pc_relative */ 1050 0, /* bitpos */ 1051 complain_overflow_dont,/* complain_on_overflow */ 1052 ppc64_elf_unhandled_reloc, /* special_function */ 1053 "R_PPC64_PLTGOT16_HA", /* name */ 1054 FALSE, /* partial_inplace */ 1055 0, /* src_mask */ 1056 0xffff, /* dst_mask */ 1057 FALSE), /* pcrel_offset */ 1058 1059 /* Like R_PPC64_ADDR16, but for instructions with a DS field. */ 1060 HOWTO (R_PPC64_ADDR16_DS, /* type */ 1061 0, /* rightshift */ 1062 1, /* size (0 = byte, 1 = short, 2 = long) */ 1063 16, /* bitsize */ 1064 FALSE, /* pc_relative */ 1065 0, /* bitpos */ 1066 complain_overflow_bitfield, /* complain_on_overflow */ 1067 bfd_elf_generic_reloc, /* special_function */ 1068 "R_PPC64_ADDR16_DS", /* name */ 1069 FALSE, /* partial_inplace */ 1070 0, /* src_mask */ 1071 0xfffc, /* dst_mask */ 1072 FALSE), /* pcrel_offset */ 1073 1074 /* Like R_PPC64_ADDR16_LO, but for instructions with a DS field. */ 1075 HOWTO (R_PPC64_ADDR16_LO_DS, /* type */ 1076 0, /* rightshift */ 1077 1, /* size (0 = byte, 1 = short, 2 = long) */ 1078 16, /* bitsize */ 1079 FALSE, /* pc_relative */ 1080 0, /* bitpos */ 1081 complain_overflow_dont,/* complain_on_overflow */ 1082 bfd_elf_generic_reloc, /* special_function */ 1083 "R_PPC64_ADDR16_LO_DS",/* name */ 1084 FALSE, /* partial_inplace */ 1085 0, /* src_mask */ 1086 0xfffc, /* dst_mask */ 1087 FALSE), /* pcrel_offset */ 1088 1089 /* Like R_PPC64_GOT16, but for instructions with a DS field. */ 1090 HOWTO (R_PPC64_GOT16_DS, /* type */ 1091 0, /* rightshift */ 1092 1, /* size (0 = byte, 1 = short, 2 = long) */ 1093 16, /* bitsize */ 1094 FALSE, /* pc_relative */ 1095 0, /* bitpos */ 1096 complain_overflow_signed, /* complain_on_overflow */ 1097 ppc64_elf_unhandled_reloc, /* special_function */ 1098 "R_PPC64_GOT16_DS", /* name */ 1099 FALSE, /* partial_inplace */ 1100 0, /* src_mask */ 1101 0xfffc, /* dst_mask */ 1102 FALSE), /* pcrel_offset */ 1103 1104 /* Like R_PPC64_GOT16_LO, but for instructions with a DS field. */ 1105 HOWTO (R_PPC64_GOT16_LO_DS, /* type */ 1106 0, /* rightshift */ 1107 1, /* size (0 = byte, 1 = short, 2 = long) */ 1108 16, /* bitsize */ 1109 FALSE, /* pc_relative */ 1110 0, /* bitpos */ 1111 complain_overflow_dont, /* complain_on_overflow */ 1112 ppc64_elf_unhandled_reloc, /* special_function */ 1113 "R_PPC64_GOT16_LO_DS", /* name */ 1114 FALSE, /* partial_inplace */ 1115 0, /* src_mask */ 1116 0xfffc, /* dst_mask */ 1117 FALSE), /* pcrel_offset */ 1118 1119 /* Like R_PPC64_PLT16_LO, but for instructions with a DS field. */ 1120 HOWTO (R_PPC64_PLT16_LO_DS, /* type */ 1121 0, /* rightshift */ 1122 1, /* size (0 = byte, 1 = short, 2 = long) */ 1123 16, /* bitsize */ 1124 FALSE, /* pc_relative */ 1125 0, /* bitpos */ 1126 complain_overflow_dont, /* complain_on_overflow */ 1127 ppc64_elf_unhandled_reloc, /* special_function */ 1128 "R_PPC64_PLT16_LO_DS", /* name */ 1129 FALSE, /* partial_inplace */ 1130 0, /* src_mask */ 1131 0xfffc, /* dst_mask */ 1132 FALSE), /* pcrel_offset */ 1133 1134 /* Like R_PPC64_SECTOFF, but for instructions with a DS field. */ 1135 HOWTO (R_PPC64_SECTOFF_DS, /* type */ 1136 0, /* rightshift */ 1137 1, /* size (0 = byte, 1 = short, 2 = long) */ 1138 16, /* bitsize */ 1139 FALSE, /* pc_relative */ 1140 0, /* bitpos */ 1141 complain_overflow_bitfield, /* complain_on_overflow */ 1142 ppc64_elf_sectoff_reloc, /* special_function */ 1143 "R_PPC64_SECTOFF_DS", /* name */ 1144 FALSE, /* partial_inplace */ 1145 0, /* src_mask */ 1146 0xfffc, /* dst_mask */ 1147 FALSE), /* pcrel_offset */ 1148 1149 /* Like R_PPC64_SECTOFF_LO, but for instructions with a DS field. */ 1150 HOWTO (R_PPC64_SECTOFF_LO_DS, /* type */ 1151 0, /* rightshift */ 1152 1, /* size (0 = byte, 1 = short, 2 = long) */ 1153 16, /* bitsize */ 1154 FALSE, /* pc_relative */ 1155 0, /* bitpos */ 1156 complain_overflow_dont, /* complain_on_overflow */ 1157 ppc64_elf_sectoff_reloc, /* special_function */ 1158 "R_PPC64_SECTOFF_LO_DS",/* name */ 1159 FALSE, /* partial_inplace */ 1160 0, /* src_mask */ 1161 0xfffc, /* dst_mask */ 1162 FALSE), /* pcrel_offset */ 1163 1164 /* Like R_PPC64_TOC16, but for instructions with a DS field. */ 1165 HOWTO (R_PPC64_TOC16_DS, /* type */ 1166 0, /* rightshift */ 1167 1, /* size (0 = byte, 1 = short, 2 = long) */ 1168 16, /* bitsize */ 1169 FALSE, /* pc_relative */ 1170 0, /* bitpos */ 1171 complain_overflow_signed, /* complain_on_overflow */ 1172 ppc64_elf_toc_reloc, /* special_function */ 1173 "R_PPC64_TOC16_DS", /* name */ 1174 FALSE, /* partial_inplace */ 1175 0, /* src_mask */ 1176 0xfffc, /* dst_mask */ 1177 FALSE), /* pcrel_offset */ 1178 1179 /* Like R_PPC64_TOC16_LO, but for instructions with a DS field. */ 1180 HOWTO (R_PPC64_TOC16_LO_DS, /* type */ 1181 0, /* rightshift */ 1182 1, /* size (0 = byte, 1 = short, 2 = long) */ 1183 16, /* bitsize */ 1184 FALSE, /* pc_relative */ 1185 0, /* bitpos */ 1186 complain_overflow_dont, /* complain_on_overflow */ 1187 ppc64_elf_toc_reloc, /* special_function */ 1188 "R_PPC64_TOC16_LO_DS", /* name */ 1189 FALSE, /* partial_inplace */ 1190 0, /* src_mask */ 1191 0xfffc, /* dst_mask */ 1192 FALSE), /* pcrel_offset */ 1193 1194 /* Like R_PPC64_PLTGOT16, but for instructions with a DS field. */ 1195 /* FIXME: R_PPC64_PLTGOT16_DS not implemented. */ 1196 HOWTO (R_PPC64_PLTGOT16_DS, /* type */ 1197 0, /* rightshift */ 1198 1, /* size (0 = byte, 1 = short, 2 = long) */ 1199 16, /* bitsize */ 1200 FALSE, /* pc_relative */ 1201 0, /* bitpos */ 1202 complain_overflow_signed, /* complain_on_overflow */ 1203 ppc64_elf_unhandled_reloc, /* special_function */ 1204 "R_PPC64_PLTGOT16_DS", /* name */ 1205 FALSE, /* partial_inplace */ 1206 0, /* src_mask */ 1207 0xfffc, /* dst_mask */ 1208 FALSE), /* pcrel_offset */ 1209 1210 /* Like R_PPC64_PLTGOT16_LO, but for instructions with a DS field. */ 1211 /* FIXME: R_PPC64_PLTGOT16_LO not implemented. */ 1212 HOWTO (R_PPC64_PLTGOT16_LO_DS,/* type */ 1213 0, /* rightshift */ 1214 1, /* size (0 = byte, 1 = short, 2 = long) */ 1215 16, /* bitsize */ 1216 FALSE, /* pc_relative */ 1217 0, /* bitpos */ 1218 complain_overflow_dont, /* complain_on_overflow */ 1219 ppc64_elf_unhandled_reloc, /* special_function */ 1220 "R_PPC64_PLTGOT16_LO_DS",/* name */ 1221 FALSE, /* partial_inplace */ 1222 0, /* src_mask */ 1223 0xfffc, /* dst_mask */ 1224 FALSE), /* pcrel_offset */ 1225 1226 /* Marker reloc for TLS. */ 1227 HOWTO (R_PPC64_TLS, 1228 0, /* rightshift */ 1229 2, /* size (0 = byte, 1 = short, 2 = long) */ 1230 32, /* bitsize */ 1231 FALSE, /* pc_relative */ 1232 0, /* bitpos */ 1233 complain_overflow_dont, /* complain_on_overflow */ 1234 bfd_elf_generic_reloc, /* special_function */ 1235 "R_PPC64_TLS", /* name */ 1236 FALSE, /* partial_inplace */ 1237 0, /* src_mask */ 1238 0, /* dst_mask */ 1239 FALSE), /* pcrel_offset */ 1240 1241 /* Computes the load module index of the load module that contains the 1242 definition of its TLS sym. */ 1243 HOWTO (R_PPC64_DTPMOD64, 1244 0, /* rightshift */ 1245 4, /* size (0 = byte, 1 = short, 2 = long) */ 1246 64, /* bitsize */ 1247 FALSE, /* pc_relative */ 1248 0, /* bitpos */ 1249 complain_overflow_dont, /* complain_on_overflow */ 1250 ppc64_elf_unhandled_reloc, /* special_function */ 1251 "R_PPC64_DTPMOD64", /* name */ 1252 FALSE, /* partial_inplace */ 1253 0, /* src_mask */ 1254 ONES (64), /* dst_mask */ 1255 FALSE), /* pcrel_offset */ 1256 1257 /* Computes a dtv-relative displacement, the difference between the value 1258 of sym+add and the base address of the thread-local storage block that 1259 contains the definition of sym, minus 0x8000. */ 1260 HOWTO (R_PPC64_DTPREL64, 1261 0, /* rightshift */ 1262 4, /* size (0 = byte, 1 = short, 2 = long) */ 1263 64, /* bitsize */ 1264 FALSE, /* pc_relative */ 1265 0, /* bitpos */ 1266 complain_overflow_dont, /* complain_on_overflow */ 1267 ppc64_elf_unhandled_reloc, /* special_function */ 1268 "R_PPC64_DTPREL64", /* name */ 1269 FALSE, /* partial_inplace */ 1270 0, /* src_mask */ 1271 ONES (64), /* dst_mask */ 1272 FALSE), /* pcrel_offset */ 1273 1274 /* A 16 bit dtprel reloc. */ 1275 HOWTO (R_PPC64_DTPREL16, 1276 0, /* rightshift */ 1277 1, /* size (0 = byte, 1 = short, 2 = long) */ 1278 16, /* bitsize */ 1279 FALSE, /* pc_relative */ 1280 0, /* bitpos */ 1281 complain_overflow_signed, /* complain_on_overflow */ 1282 ppc64_elf_unhandled_reloc, /* special_function */ 1283 "R_PPC64_DTPREL16", /* name */ 1284 FALSE, /* partial_inplace */ 1285 0, /* src_mask */ 1286 0xffff, /* dst_mask */ 1287 FALSE), /* pcrel_offset */ 1288 1289 /* Like DTPREL16, but no overflow. */ 1290 HOWTO (R_PPC64_DTPREL16_LO, 1291 0, /* rightshift */ 1292 1, /* size (0 = byte, 1 = short, 2 = long) */ 1293 16, /* bitsize */ 1294 FALSE, /* pc_relative */ 1295 0, /* bitpos */ 1296 complain_overflow_dont, /* complain_on_overflow */ 1297 ppc64_elf_unhandled_reloc, /* special_function */ 1298 "R_PPC64_DTPREL16_LO", /* name */ 1299 FALSE, /* partial_inplace */ 1300 0, /* src_mask */ 1301 0xffff, /* dst_mask */ 1302 FALSE), /* pcrel_offset */ 1303 1304 /* Like DTPREL16_LO, but next higher group of 16 bits. */ 1305 HOWTO (R_PPC64_DTPREL16_HI, 1306 16, /* rightshift */ 1307 1, /* size (0 = byte, 1 = short, 2 = long) */ 1308 16, /* bitsize */ 1309 FALSE, /* pc_relative */ 1310 0, /* bitpos */ 1311 complain_overflow_dont, /* complain_on_overflow */ 1312 ppc64_elf_unhandled_reloc, /* special_function */ 1313 "R_PPC64_DTPREL16_HI", /* name */ 1314 FALSE, /* partial_inplace */ 1315 0, /* src_mask */ 1316 0xffff, /* dst_mask */ 1317 FALSE), /* pcrel_offset */ 1318 1319 /* Like DTPREL16_HI, but adjust for low 16 bits. */ 1320 HOWTO (R_PPC64_DTPREL16_HA, 1321 16, /* rightshift */ 1322 1, /* size (0 = byte, 1 = short, 2 = long) */ 1323 16, /* bitsize */ 1324 FALSE, /* pc_relative */ 1325 0, /* bitpos */ 1326 complain_overflow_dont, /* complain_on_overflow */ 1327 ppc64_elf_unhandled_reloc, /* special_function */ 1328 "R_PPC64_DTPREL16_HA", /* name */ 1329 FALSE, /* partial_inplace */ 1330 0, /* src_mask */ 1331 0xffff, /* dst_mask */ 1332 FALSE), /* pcrel_offset */ 1333 1334 /* Like DTPREL16_HI, but next higher group of 16 bits. */ 1335 HOWTO (R_PPC64_DTPREL16_HIGHER, 1336 32, /* rightshift */ 1337 1, /* size (0 = byte, 1 = short, 2 = long) */ 1338 16, /* bitsize */ 1339 FALSE, /* pc_relative */ 1340 0, /* bitpos */ 1341 complain_overflow_dont, /* complain_on_overflow */ 1342 ppc64_elf_unhandled_reloc, /* special_function */ 1343 "R_PPC64_DTPREL16_HIGHER", /* name */ 1344 FALSE, /* partial_inplace */ 1345 0, /* src_mask */ 1346 0xffff, /* dst_mask */ 1347 FALSE), /* pcrel_offset */ 1348 1349 /* Like DTPREL16_HIGHER, but adjust for low 16 bits. */ 1350 HOWTO (R_PPC64_DTPREL16_HIGHERA, 1351 32, /* rightshift */ 1352 1, /* size (0 = byte, 1 = short, 2 = long) */ 1353 16, /* bitsize */ 1354 FALSE, /* pc_relative */ 1355 0, /* bitpos */ 1356 complain_overflow_dont, /* complain_on_overflow */ 1357 ppc64_elf_unhandled_reloc, /* special_function */ 1358 "R_PPC64_DTPREL16_HIGHERA", /* name */ 1359 FALSE, /* partial_inplace */ 1360 0, /* src_mask */ 1361 0xffff, /* dst_mask */ 1362 FALSE), /* pcrel_offset */ 1363 1364 /* Like DTPREL16_HIGHER, but next higher group of 16 bits. */ 1365 HOWTO (R_PPC64_DTPREL16_HIGHEST, 1366 48, /* rightshift */ 1367 1, /* size (0 = byte, 1 = short, 2 = long) */ 1368 16, /* bitsize */ 1369 FALSE, /* pc_relative */ 1370 0, /* bitpos */ 1371 complain_overflow_dont, /* complain_on_overflow */ 1372 ppc64_elf_unhandled_reloc, /* special_function */ 1373 "R_PPC64_DTPREL16_HIGHEST", /* name */ 1374 FALSE, /* partial_inplace */ 1375 0, /* src_mask */ 1376 0xffff, /* dst_mask */ 1377 FALSE), /* pcrel_offset */ 1378 1379 /* Like DTPREL16_HIGHEST, but adjust for low 16 bits. */ 1380 HOWTO (R_PPC64_DTPREL16_HIGHESTA, 1381 48, /* rightshift */ 1382 1, /* size (0 = byte, 1 = short, 2 = long) */ 1383 16, /* bitsize */ 1384 FALSE, /* pc_relative */ 1385 0, /* bitpos */ 1386 complain_overflow_dont, /* complain_on_overflow */ 1387 ppc64_elf_unhandled_reloc, /* special_function */ 1388 "R_PPC64_DTPREL16_HIGHESTA", /* name */ 1389 FALSE, /* partial_inplace */ 1390 0, /* src_mask */ 1391 0xffff, /* dst_mask */ 1392 FALSE), /* pcrel_offset */ 1393 1394 /* Like DTPREL16, but for insns with a DS field. */ 1395 HOWTO (R_PPC64_DTPREL16_DS, 1396 0, /* rightshift */ 1397 1, /* size (0 = byte, 1 = short, 2 = long) */ 1398 16, /* bitsize */ 1399 FALSE, /* pc_relative */ 1400 0, /* bitpos */ 1401 complain_overflow_signed, /* complain_on_overflow */ 1402 ppc64_elf_unhandled_reloc, /* special_function */ 1403 "R_PPC64_DTPREL16_DS", /* name */ 1404 FALSE, /* partial_inplace */ 1405 0, /* src_mask */ 1406 0xfffc, /* dst_mask */ 1407 FALSE), /* pcrel_offset */ 1408 1409 /* Like DTPREL16_DS, but no overflow. */ 1410 HOWTO (R_PPC64_DTPREL16_LO_DS, 1411 0, /* rightshift */ 1412 1, /* size (0 = byte, 1 = short, 2 = long) */ 1413 16, /* bitsize */ 1414 FALSE, /* pc_relative */ 1415 0, /* bitpos */ 1416 complain_overflow_dont, /* complain_on_overflow */ 1417 ppc64_elf_unhandled_reloc, /* special_function */ 1418 "R_PPC64_DTPREL16_LO_DS", /* name */ 1419 FALSE, /* partial_inplace */ 1420 0, /* src_mask */ 1421 0xfffc, /* dst_mask */ 1422 FALSE), /* pcrel_offset */ 1423 1424 /* Computes a tp-relative displacement, the difference between the value of 1425 sym+add and the value of the thread pointer (r13). */ 1426 HOWTO (R_PPC64_TPREL64, 1427 0, /* rightshift */ 1428 4, /* size (0 = byte, 1 = short, 2 = long) */ 1429 64, /* bitsize */ 1430 FALSE, /* pc_relative */ 1431 0, /* bitpos */ 1432 complain_overflow_dont, /* complain_on_overflow */ 1433 ppc64_elf_unhandled_reloc, /* special_function */ 1434 "R_PPC64_TPREL64", /* name */ 1435 FALSE, /* partial_inplace */ 1436 0, /* src_mask */ 1437 ONES (64), /* dst_mask */ 1438 FALSE), /* pcrel_offset */ 1439 1440 /* A 16 bit tprel reloc. */ 1441 HOWTO (R_PPC64_TPREL16, 1442 0, /* rightshift */ 1443 1, /* size (0 = byte, 1 = short, 2 = long) */ 1444 16, /* bitsize */ 1445 FALSE, /* pc_relative */ 1446 0, /* bitpos */ 1447 complain_overflow_signed, /* complain_on_overflow */ 1448 ppc64_elf_unhandled_reloc, /* special_function */ 1449 "R_PPC64_TPREL16", /* name */ 1450 FALSE, /* partial_inplace */ 1451 0, /* src_mask */ 1452 0xffff, /* dst_mask */ 1453 FALSE), /* pcrel_offset */ 1454 1455 /* Like TPREL16, but no overflow. */ 1456 HOWTO (R_PPC64_TPREL16_LO, 1457 0, /* rightshift */ 1458 1, /* size (0 = byte, 1 = short, 2 = long) */ 1459 16, /* bitsize */ 1460 FALSE, /* pc_relative */ 1461 0, /* bitpos */ 1462 complain_overflow_dont, /* complain_on_overflow */ 1463 ppc64_elf_unhandled_reloc, /* special_function */ 1464 "R_PPC64_TPREL16_LO", /* name */ 1465 FALSE, /* partial_inplace */ 1466 0, /* src_mask */ 1467 0xffff, /* dst_mask */ 1468 FALSE), /* pcrel_offset */ 1469 1470 /* Like TPREL16_LO, but next higher group of 16 bits. */ 1471 HOWTO (R_PPC64_TPREL16_HI, 1472 16, /* rightshift */ 1473 1, /* size (0 = byte, 1 = short, 2 = long) */ 1474 16, /* bitsize */ 1475 FALSE, /* pc_relative */ 1476 0, /* bitpos */ 1477 complain_overflow_dont, /* complain_on_overflow */ 1478 ppc64_elf_unhandled_reloc, /* special_function */ 1479 "R_PPC64_TPREL16_HI", /* name */ 1480 FALSE, /* partial_inplace */ 1481 0, /* src_mask */ 1482 0xffff, /* dst_mask */ 1483 FALSE), /* pcrel_offset */ 1484 1485 /* Like TPREL16_HI, but adjust for low 16 bits. */ 1486 HOWTO (R_PPC64_TPREL16_HA, 1487 16, /* rightshift */ 1488 1, /* size (0 = byte, 1 = short, 2 = long) */ 1489 16, /* bitsize */ 1490 FALSE, /* pc_relative */ 1491 0, /* bitpos */ 1492 complain_overflow_dont, /* complain_on_overflow */ 1493 ppc64_elf_unhandled_reloc, /* special_function */ 1494 "R_PPC64_TPREL16_HA", /* name */ 1495 FALSE, /* partial_inplace */ 1496 0, /* src_mask */ 1497 0xffff, /* dst_mask */ 1498 FALSE), /* pcrel_offset */ 1499 1500 /* Like TPREL16_HI, but next higher group of 16 bits. */ 1501 HOWTO (R_PPC64_TPREL16_HIGHER, 1502 32, /* rightshift */ 1503 1, /* size (0 = byte, 1 = short, 2 = long) */ 1504 16, /* bitsize */ 1505 FALSE, /* pc_relative */ 1506 0, /* bitpos */ 1507 complain_overflow_dont, /* complain_on_overflow */ 1508 ppc64_elf_unhandled_reloc, /* special_function */ 1509 "R_PPC64_TPREL16_HIGHER", /* name */ 1510 FALSE, /* partial_inplace */ 1511 0, /* src_mask */ 1512 0xffff, /* dst_mask */ 1513 FALSE), /* pcrel_offset */ 1514 1515 /* Like TPREL16_HIGHER, but adjust for low 16 bits. */ 1516 HOWTO (R_PPC64_TPREL16_HIGHERA, 1517 32, /* rightshift */ 1518 1, /* size (0 = byte, 1 = short, 2 = long) */ 1519 16, /* bitsize */ 1520 FALSE, /* pc_relative */ 1521 0, /* bitpos */ 1522 complain_overflow_dont, /* complain_on_overflow */ 1523 ppc64_elf_unhandled_reloc, /* special_function */ 1524 "R_PPC64_TPREL16_HIGHERA", /* name */ 1525 FALSE, /* partial_inplace */ 1526 0, /* src_mask */ 1527 0xffff, /* dst_mask */ 1528 FALSE), /* pcrel_offset */ 1529 1530 /* Like TPREL16_HIGHER, but next higher group of 16 bits. */ 1531 HOWTO (R_PPC64_TPREL16_HIGHEST, 1532 48, /* rightshift */ 1533 1, /* size (0 = byte, 1 = short, 2 = long) */ 1534 16, /* bitsize */ 1535 FALSE, /* pc_relative */ 1536 0, /* bitpos */ 1537 complain_overflow_dont, /* complain_on_overflow */ 1538 ppc64_elf_unhandled_reloc, /* special_function */ 1539 "R_PPC64_TPREL16_HIGHEST", /* name */ 1540 FALSE, /* partial_inplace */ 1541 0, /* src_mask */ 1542 0xffff, /* dst_mask */ 1543 FALSE), /* pcrel_offset */ 1544 1545 /* Like TPREL16_HIGHEST, but adjust for low 16 bits. */ 1546 HOWTO (R_PPC64_TPREL16_HIGHESTA, 1547 48, /* rightshift */ 1548 1, /* size (0 = byte, 1 = short, 2 = long) */ 1549 16, /* bitsize */ 1550 FALSE, /* pc_relative */ 1551 0, /* bitpos */ 1552 complain_overflow_dont, /* complain_on_overflow */ 1553 ppc64_elf_unhandled_reloc, /* special_function */ 1554 "R_PPC64_TPREL16_HIGHESTA", /* name */ 1555 FALSE, /* partial_inplace */ 1556 0, /* src_mask */ 1557 0xffff, /* dst_mask */ 1558 FALSE), /* pcrel_offset */ 1559 1560 /* Like TPREL16, but for insns with a DS field. */ 1561 HOWTO (R_PPC64_TPREL16_DS, 1562 0, /* rightshift */ 1563 1, /* size (0 = byte, 1 = short, 2 = long) */ 1564 16, /* bitsize */ 1565 FALSE, /* pc_relative */ 1566 0, /* bitpos */ 1567 complain_overflow_signed, /* complain_on_overflow */ 1568 ppc64_elf_unhandled_reloc, /* special_function */ 1569 "R_PPC64_TPREL16_DS", /* name */ 1570 FALSE, /* partial_inplace */ 1571 0, /* src_mask */ 1572 0xfffc, /* dst_mask */ 1573 FALSE), /* pcrel_offset */ 1574 1575 /* Like TPREL16_DS, but no overflow. */ 1576 HOWTO (R_PPC64_TPREL16_LO_DS, 1577 0, /* rightshift */ 1578 1, /* size (0 = byte, 1 = short, 2 = long) */ 1579 16, /* bitsize */ 1580 FALSE, /* pc_relative */ 1581 0, /* bitpos */ 1582 complain_overflow_dont, /* complain_on_overflow */ 1583 ppc64_elf_unhandled_reloc, /* special_function */ 1584 "R_PPC64_TPREL16_LO_DS", /* name */ 1585 FALSE, /* partial_inplace */ 1586 0, /* src_mask */ 1587 0xfffc, /* dst_mask */ 1588 FALSE), /* pcrel_offset */ 1589 1590 /* Allocates two contiguous entries in the GOT to hold a tls_index structure, 1591 with values (sym+add)@dtpmod and (sym+add)@dtprel, and computes the offset 1592 to the first entry relative to the TOC base (r2). */ 1593 HOWTO (R_PPC64_GOT_TLSGD16, 1594 0, /* rightshift */ 1595 1, /* size (0 = byte, 1 = short, 2 = long) */ 1596 16, /* bitsize */ 1597 FALSE, /* pc_relative */ 1598 0, /* bitpos */ 1599 complain_overflow_signed, /* complain_on_overflow */ 1600 ppc64_elf_unhandled_reloc, /* special_function */ 1601 "R_PPC64_GOT_TLSGD16", /* name */ 1602 FALSE, /* partial_inplace */ 1603 0, /* src_mask */ 1604 0xffff, /* dst_mask */ 1605 FALSE), /* pcrel_offset */ 1606 1607 /* Like GOT_TLSGD16, but no overflow. */ 1608 HOWTO (R_PPC64_GOT_TLSGD16_LO, 1609 0, /* rightshift */ 1610 1, /* size (0 = byte, 1 = short, 2 = long) */ 1611 16, /* bitsize */ 1612 FALSE, /* pc_relative */ 1613 0, /* bitpos */ 1614 complain_overflow_dont, /* complain_on_overflow */ 1615 ppc64_elf_unhandled_reloc, /* special_function */ 1616 "R_PPC64_GOT_TLSGD16_LO", /* name */ 1617 FALSE, /* partial_inplace */ 1618 0, /* src_mask */ 1619 0xffff, /* dst_mask */ 1620 FALSE), /* pcrel_offset */ 1621 1622 /* Like GOT_TLSGD16_LO, but next higher group of 16 bits. */ 1623 HOWTO (R_PPC64_GOT_TLSGD16_HI, 1624 16, /* rightshift */ 1625 1, /* size (0 = byte, 1 = short, 2 = long) */ 1626 16, /* bitsize */ 1627 FALSE, /* pc_relative */ 1628 0, /* bitpos */ 1629 complain_overflow_dont, /* complain_on_overflow */ 1630 ppc64_elf_unhandled_reloc, /* special_function */ 1631 "R_PPC64_GOT_TLSGD16_HI", /* name */ 1632 FALSE, /* partial_inplace */ 1633 0, /* src_mask */ 1634 0xffff, /* dst_mask */ 1635 FALSE), /* pcrel_offset */ 1636 1637 /* Like GOT_TLSGD16_HI, but adjust for low 16 bits. */ 1638 HOWTO (R_PPC64_GOT_TLSGD16_HA, 1639 16, /* rightshift */ 1640 1, /* size (0 = byte, 1 = short, 2 = long) */ 1641 16, /* bitsize */ 1642 FALSE, /* pc_relative */ 1643 0, /* bitpos */ 1644 complain_overflow_dont, /* complain_on_overflow */ 1645 ppc64_elf_unhandled_reloc, /* special_function */ 1646 "R_PPC64_GOT_TLSGD16_HA", /* name */ 1647 FALSE, /* partial_inplace */ 1648 0, /* src_mask */ 1649 0xffff, /* dst_mask */ 1650 FALSE), /* pcrel_offset */ 1651 1652 /* Allocates two contiguous entries in the GOT to hold a tls_index structure, 1653 with values (sym+add)@dtpmod and zero, and computes the offset to the 1654 first entry relative to the TOC base (r2). */ 1655 HOWTO (R_PPC64_GOT_TLSLD16, 1656 0, /* rightshift */ 1657 1, /* size (0 = byte, 1 = short, 2 = long) */ 1658 16, /* bitsize */ 1659 FALSE, /* pc_relative */ 1660 0, /* bitpos */ 1661 complain_overflow_signed, /* complain_on_overflow */ 1662 ppc64_elf_unhandled_reloc, /* special_function */ 1663 "R_PPC64_GOT_TLSLD16", /* name */ 1664 FALSE, /* partial_inplace */ 1665 0, /* src_mask */ 1666 0xffff, /* dst_mask */ 1667 FALSE), /* pcrel_offset */ 1668 1669 /* Like GOT_TLSLD16, but no overflow. */ 1670 HOWTO (R_PPC64_GOT_TLSLD16_LO, 1671 0, /* rightshift */ 1672 1, /* size (0 = byte, 1 = short, 2 = long) */ 1673 16, /* bitsize */ 1674 FALSE, /* pc_relative */ 1675 0, /* bitpos */ 1676 complain_overflow_dont, /* complain_on_overflow */ 1677 ppc64_elf_unhandled_reloc, /* special_function */ 1678 "R_PPC64_GOT_TLSLD16_LO", /* name */ 1679 FALSE, /* partial_inplace */ 1680 0, /* src_mask */ 1681 0xffff, /* dst_mask */ 1682 FALSE), /* pcrel_offset */ 1683 1684 /* Like GOT_TLSLD16_LO, but next higher group of 16 bits. */ 1685 HOWTO (R_PPC64_GOT_TLSLD16_HI, 1686 16, /* rightshift */ 1687 1, /* size (0 = byte, 1 = short, 2 = long) */ 1688 16, /* bitsize */ 1689 FALSE, /* pc_relative */ 1690 0, /* bitpos */ 1691 complain_overflow_dont, /* complain_on_overflow */ 1692 ppc64_elf_unhandled_reloc, /* special_function */ 1693 "R_PPC64_GOT_TLSLD16_HI", /* name */ 1694 FALSE, /* partial_inplace */ 1695 0, /* src_mask */ 1696 0xffff, /* dst_mask */ 1697 FALSE), /* pcrel_offset */ 1698 1699 /* Like GOT_TLSLD16_HI, but adjust for low 16 bits. */ 1700 HOWTO (R_PPC64_GOT_TLSLD16_HA, 1701 16, /* rightshift */ 1702 1, /* size (0 = byte, 1 = short, 2 = long) */ 1703 16, /* bitsize */ 1704 FALSE, /* pc_relative */ 1705 0, /* bitpos */ 1706 complain_overflow_dont, /* complain_on_overflow */ 1707 ppc64_elf_unhandled_reloc, /* special_function */ 1708 "R_PPC64_GOT_TLSLD16_HA", /* name */ 1709 FALSE, /* partial_inplace */ 1710 0, /* src_mask */ 1711 0xffff, /* dst_mask */ 1712 FALSE), /* pcrel_offset */ 1713 1714 /* Allocates an entry in the GOT with value (sym+add)@dtprel, and computes 1715 the offset to the entry relative to the TOC base (r2). */ 1716 HOWTO (R_PPC64_GOT_DTPREL16_DS, 1717 0, /* rightshift */ 1718 1, /* size (0 = byte, 1 = short, 2 = long) */ 1719 16, /* bitsize */ 1720 FALSE, /* pc_relative */ 1721 0, /* bitpos */ 1722 complain_overflow_signed, /* complain_on_overflow */ 1723 ppc64_elf_unhandled_reloc, /* special_function */ 1724 "R_PPC64_GOT_DTPREL16_DS", /* name */ 1725 FALSE, /* partial_inplace */ 1726 0, /* src_mask */ 1727 0xfffc, /* dst_mask */ 1728 FALSE), /* pcrel_offset */ 1729 1730 /* Like GOT_DTPREL16_DS, but no overflow. */ 1731 HOWTO (R_PPC64_GOT_DTPREL16_LO_DS, 1732 0, /* rightshift */ 1733 1, /* size (0 = byte, 1 = short, 2 = long) */ 1734 16, /* bitsize */ 1735 FALSE, /* pc_relative */ 1736 0, /* bitpos */ 1737 complain_overflow_dont, /* complain_on_overflow */ 1738 ppc64_elf_unhandled_reloc, /* special_function */ 1739 "R_PPC64_GOT_DTPREL16_LO_DS", /* name */ 1740 FALSE, /* partial_inplace */ 1741 0, /* src_mask */ 1742 0xfffc, /* dst_mask */ 1743 FALSE), /* pcrel_offset */ 1744 1745 /* Like GOT_DTPREL16_LO_DS, but next higher group of 16 bits. */ 1746 HOWTO (R_PPC64_GOT_DTPREL16_HI, 1747 16, /* rightshift */ 1748 1, /* size (0 = byte, 1 = short, 2 = long) */ 1749 16, /* bitsize */ 1750 FALSE, /* pc_relative */ 1751 0, /* bitpos */ 1752 complain_overflow_dont, /* complain_on_overflow */ 1753 ppc64_elf_unhandled_reloc, /* special_function */ 1754 "R_PPC64_GOT_DTPREL16_HI", /* name */ 1755 FALSE, /* partial_inplace */ 1756 0, /* src_mask */ 1757 0xffff, /* dst_mask */ 1758 FALSE), /* pcrel_offset */ 1759 1760 /* Like GOT_DTPREL16_HI, but adjust for low 16 bits. */ 1761 HOWTO (R_PPC64_GOT_DTPREL16_HA, 1762 16, /* rightshift */ 1763 1, /* size (0 = byte, 1 = short, 2 = long) */ 1764 16, /* bitsize */ 1765 FALSE, /* pc_relative */ 1766 0, /* bitpos */ 1767 complain_overflow_dont, /* complain_on_overflow */ 1768 ppc64_elf_unhandled_reloc, /* special_function */ 1769 "R_PPC64_GOT_DTPREL16_HA", /* name */ 1770 FALSE, /* partial_inplace */ 1771 0, /* src_mask */ 1772 0xffff, /* dst_mask */ 1773 FALSE), /* pcrel_offset */ 1774 1775 /* Allocates an entry in the GOT with value (sym+add)@tprel, and computes the 1776 offset to the entry relative to the TOC base (r2). */ 1777 HOWTO (R_PPC64_GOT_TPREL16_DS, 1778 0, /* rightshift */ 1779 1, /* size (0 = byte, 1 = short, 2 = long) */ 1780 16, /* bitsize */ 1781 FALSE, /* pc_relative */ 1782 0, /* bitpos */ 1783 complain_overflow_signed, /* complain_on_overflow */ 1784 ppc64_elf_unhandled_reloc, /* special_function */ 1785 "R_PPC64_GOT_TPREL16_DS", /* name */ 1786 FALSE, /* partial_inplace */ 1787 0, /* src_mask */ 1788 0xfffc, /* dst_mask */ 1789 FALSE), /* pcrel_offset */ 1790 1791 /* Like GOT_TPREL16_DS, but no overflow. */ 1792 HOWTO (R_PPC64_GOT_TPREL16_LO_DS, 1793 0, /* rightshift */ 1794 1, /* size (0 = byte, 1 = short, 2 = long) */ 1795 16, /* bitsize */ 1796 FALSE, /* pc_relative */ 1797 0, /* bitpos */ 1798 complain_overflow_dont, /* complain_on_overflow */ 1799 ppc64_elf_unhandled_reloc, /* special_function */ 1800 "R_PPC64_GOT_TPREL16_LO_DS", /* name */ 1801 FALSE, /* partial_inplace */ 1802 0, /* src_mask */ 1803 0xfffc, /* dst_mask */ 1804 FALSE), /* pcrel_offset */ 1805 1806 /* Like GOT_TPREL16_LO_DS, but next higher group of 16 bits. */ 1807 HOWTO (R_PPC64_GOT_TPREL16_HI, 1808 16, /* rightshift */ 1809 1, /* size (0 = byte, 1 = short, 2 = long) */ 1810 16, /* bitsize */ 1811 FALSE, /* pc_relative */ 1812 0, /* bitpos */ 1813 complain_overflow_dont, /* complain_on_overflow */ 1814 ppc64_elf_unhandled_reloc, /* special_function */ 1815 "R_PPC64_GOT_TPREL16_HI", /* name */ 1816 FALSE, /* partial_inplace */ 1817 0, /* src_mask */ 1818 0xffff, /* dst_mask */ 1819 FALSE), /* pcrel_offset */ 1820 1821 /* Like GOT_TPREL16_HI, but adjust for low 16 bits. */ 1822 HOWTO (R_PPC64_GOT_TPREL16_HA, 1823 16, /* rightshift */ 1824 1, /* size (0 = byte, 1 = short, 2 = long) */ 1825 16, /* bitsize */ 1826 FALSE, /* pc_relative */ 1827 0, /* bitpos */ 1828 complain_overflow_dont, /* complain_on_overflow */ 1829 ppc64_elf_unhandled_reloc, /* special_function */ 1830 "R_PPC64_GOT_TPREL16_HA", /* name */ 1831 FALSE, /* partial_inplace */ 1832 0, /* src_mask */ 1833 0xffff, /* dst_mask */ 1834 FALSE), /* pcrel_offset */ 1835 1836 /* GNU extension to record C++ vtable hierarchy. */ 1837 HOWTO (R_PPC64_GNU_VTINHERIT, /* type */ 1838 0, /* rightshift */ 1839 0, /* size (0 = byte, 1 = short, 2 = long) */ 1840 0, /* bitsize */ 1841 FALSE, /* pc_relative */ 1842 0, /* bitpos */ 1843 complain_overflow_dont, /* complain_on_overflow */ 1844 NULL, /* special_function */ 1845 "R_PPC64_GNU_VTINHERIT", /* name */ 1846 FALSE, /* partial_inplace */ 1847 0, /* src_mask */ 1848 0, /* dst_mask */ 1849 FALSE), /* pcrel_offset */ 1850 1851 /* GNU extension to record C++ vtable member usage. */ 1852 HOWTO (R_PPC64_GNU_VTENTRY, /* type */ 1853 0, /* rightshift */ 1854 0, /* size (0 = byte, 1 = short, 2 = long) */ 1855 0, /* bitsize */ 1856 FALSE, /* pc_relative */ 1857 0, /* bitpos */ 1858 complain_overflow_dont, /* complain_on_overflow */ 1859 NULL, /* special_function */ 1860 "R_PPC64_GNU_VTENTRY", /* name */ 1861 FALSE, /* partial_inplace */ 1862 0, /* src_mask */ 1863 0, /* dst_mask */ 1864 FALSE), /* pcrel_offset */ 1865}; 1866 1867 1868/* Initialize the ppc64_elf_howto_table, so that linear accesses can 1869 be done. */ 1870 1871static void 1872ppc_howto_init (void) 1873{ 1874 unsigned int i, type; 1875 1876 for (i = 0; 1877 i < sizeof (ppc64_elf_howto_raw) / sizeof (ppc64_elf_howto_raw[0]); 1878 i++) 1879 { 1880 type = ppc64_elf_howto_raw[i].type; 1881 BFD_ASSERT (type < (sizeof (ppc64_elf_howto_table) 1882 / sizeof (ppc64_elf_howto_table[0]))); 1883 ppc64_elf_howto_table[type] = &ppc64_elf_howto_raw[i]; 1884 } 1885} 1886 1887static reloc_howto_type * 1888ppc64_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 1889 bfd_reloc_code_real_type code) 1890{ 1891 enum elf_ppc64_reloc_type r = R_PPC64_NONE; 1892 1893 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 1894 /* Initialize howto table if needed. */ 1895 ppc_howto_init (); 1896 1897 switch (code) 1898 { 1899 default: 1900 return NULL; 1901 1902 case BFD_RELOC_NONE: r = R_PPC64_NONE; 1903 break; 1904 case BFD_RELOC_32: r = R_PPC64_ADDR32; 1905 break; 1906 case BFD_RELOC_PPC_BA26: r = R_PPC64_ADDR24; 1907 break; 1908 case BFD_RELOC_16: r = R_PPC64_ADDR16; 1909 break; 1910 case BFD_RELOC_LO16: r = R_PPC64_ADDR16_LO; 1911 break; 1912 case BFD_RELOC_HI16: r = R_PPC64_ADDR16_HI; 1913 break; 1914 case BFD_RELOC_HI16_S: r = R_PPC64_ADDR16_HA; 1915 break; 1916 case BFD_RELOC_PPC_BA16: r = R_PPC64_ADDR14; 1917 break; 1918 case BFD_RELOC_PPC_BA16_BRTAKEN: r = R_PPC64_ADDR14_BRTAKEN; 1919 break; 1920 case BFD_RELOC_PPC_BA16_BRNTAKEN: r = R_PPC64_ADDR14_BRNTAKEN; 1921 break; 1922 case BFD_RELOC_PPC_B26: r = R_PPC64_REL24; 1923 break; 1924 case BFD_RELOC_PPC_B16: r = R_PPC64_REL14; 1925 break; 1926 case BFD_RELOC_PPC_B16_BRTAKEN: r = R_PPC64_REL14_BRTAKEN; 1927 break; 1928 case BFD_RELOC_PPC_B16_BRNTAKEN: r = R_PPC64_REL14_BRNTAKEN; 1929 break; 1930 case BFD_RELOC_16_GOTOFF: r = R_PPC64_GOT16; 1931 break; 1932 case BFD_RELOC_LO16_GOTOFF: r = R_PPC64_GOT16_LO; 1933 break; 1934 case BFD_RELOC_HI16_GOTOFF: r = R_PPC64_GOT16_HI; 1935 break; 1936 case BFD_RELOC_HI16_S_GOTOFF: r = R_PPC64_GOT16_HA; 1937 break; 1938 case BFD_RELOC_PPC_COPY: r = R_PPC64_COPY; 1939 break; 1940 case BFD_RELOC_PPC_GLOB_DAT: r = R_PPC64_GLOB_DAT; 1941 break; 1942 case BFD_RELOC_32_PCREL: r = R_PPC64_REL32; 1943 break; 1944 case BFD_RELOC_32_PLTOFF: r = R_PPC64_PLT32; 1945 break; 1946 case BFD_RELOC_32_PLT_PCREL: r = R_PPC64_PLTREL32; 1947 break; 1948 case BFD_RELOC_LO16_PLTOFF: r = R_PPC64_PLT16_LO; 1949 break; 1950 case BFD_RELOC_HI16_PLTOFF: r = R_PPC64_PLT16_HI; 1951 break; 1952 case BFD_RELOC_HI16_S_PLTOFF: r = R_PPC64_PLT16_HA; 1953 break; 1954 case BFD_RELOC_16_BASEREL: r = R_PPC64_SECTOFF; 1955 break; 1956 case BFD_RELOC_LO16_BASEREL: r = R_PPC64_SECTOFF_LO; 1957 break; 1958 case BFD_RELOC_HI16_BASEREL: r = R_PPC64_SECTOFF_HI; 1959 break; 1960 case BFD_RELOC_HI16_S_BASEREL: r = R_PPC64_SECTOFF_HA; 1961 break; 1962 case BFD_RELOC_CTOR: r = R_PPC64_ADDR64; 1963 break; 1964 case BFD_RELOC_64: r = R_PPC64_ADDR64; 1965 break; 1966 case BFD_RELOC_PPC64_HIGHER: r = R_PPC64_ADDR16_HIGHER; 1967 break; 1968 case BFD_RELOC_PPC64_HIGHER_S: r = R_PPC64_ADDR16_HIGHERA; 1969 break; 1970 case BFD_RELOC_PPC64_HIGHEST: r = R_PPC64_ADDR16_HIGHEST; 1971 break; 1972 case BFD_RELOC_PPC64_HIGHEST_S: r = R_PPC64_ADDR16_HIGHESTA; 1973 break; 1974 case BFD_RELOC_64_PCREL: r = R_PPC64_REL64; 1975 break; 1976 case BFD_RELOC_64_PLTOFF: r = R_PPC64_PLT64; 1977 break; 1978 case BFD_RELOC_64_PLT_PCREL: r = R_PPC64_PLTREL64; 1979 break; 1980 case BFD_RELOC_PPC_TOC16: r = R_PPC64_TOC16; 1981 break; 1982 case BFD_RELOC_PPC64_TOC16_LO: r = R_PPC64_TOC16_LO; 1983 break; 1984 case BFD_RELOC_PPC64_TOC16_HI: r = R_PPC64_TOC16_HI; 1985 break; 1986 case BFD_RELOC_PPC64_TOC16_HA: r = R_PPC64_TOC16_HA; 1987 break; 1988 case BFD_RELOC_PPC64_TOC: r = R_PPC64_TOC; 1989 break; 1990 case BFD_RELOC_PPC64_PLTGOT16: r = R_PPC64_PLTGOT16; 1991 break; 1992 case BFD_RELOC_PPC64_PLTGOT16_LO: r = R_PPC64_PLTGOT16_LO; 1993 break; 1994 case BFD_RELOC_PPC64_PLTGOT16_HI: r = R_PPC64_PLTGOT16_HI; 1995 break; 1996 case BFD_RELOC_PPC64_PLTGOT16_HA: r = R_PPC64_PLTGOT16_HA; 1997 break; 1998 case BFD_RELOC_PPC64_ADDR16_DS: r = R_PPC64_ADDR16_DS; 1999 break; 2000 case BFD_RELOC_PPC64_ADDR16_LO_DS: r = R_PPC64_ADDR16_LO_DS; 2001 break; 2002 case BFD_RELOC_PPC64_GOT16_DS: r = R_PPC64_GOT16_DS; 2003 break; 2004 case BFD_RELOC_PPC64_GOT16_LO_DS: r = R_PPC64_GOT16_LO_DS; 2005 break; 2006 case BFD_RELOC_PPC64_PLT16_LO_DS: r = R_PPC64_PLT16_LO_DS; 2007 break; 2008 case BFD_RELOC_PPC64_SECTOFF_DS: r = R_PPC64_SECTOFF_DS; 2009 break; 2010 case BFD_RELOC_PPC64_SECTOFF_LO_DS: r = R_PPC64_SECTOFF_LO_DS; 2011 break; 2012 case BFD_RELOC_PPC64_TOC16_DS: r = R_PPC64_TOC16_DS; 2013 break; 2014 case BFD_RELOC_PPC64_TOC16_LO_DS: r = R_PPC64_TOC16_LO_DS; 2015 break; 2016 case BFD_RELOC_PPC64_PLTGOT16_DS: r = R_PPC64_PLTGOT16_DS; 2017 break; 2018 case BFD_RELOC_PPC64_PLTGOT16_LO_DS: r = R_PPC64_PLTGOT16_LO_DS; 2019 break; 2020 case BFD_RELOC_PPC_TLS: r = R_PPC64_TLS; 2021 break; 2022 case BFD_RELOC_PPC_DTPMOD: r = R_PPC64_DTPMOD64; 2023 break; 2024 case BFD_RELOC_PPC_TPREL16: r = R_PPC64_TPREL16; 2025 break; 2026 case BFD_RELOC_PPC_TPREL16_LO: r = R_PPC64_TPREL16_LO; 2027 break; 2028 case BFD_RELOC_PPC_TPREL16_HI: r = R_PPC64_TPREL16_HI; 2029 break; 2030 case BFD_RELOC_PPC_TPREL16_HA: r = R_PPC64_TPREL16_HA; 2031 break; 2032 case BFD_RELOC_PPC_TPREL: r = R_PPC64_TPREL64; 2033 break; 2034 case BFD_RELOC_PPC_DTPREL16: r = R_PPC64_DTPREL16; 2035 break; 2036 case BFD_RELOC_PPC_DTPREL16_LO: r = R_PPC64_DTPREL16_LO; 2037 break; 2038 case BFD_RELOC_PPC_DTPREL16_HI: r = R_PPC64_DTPREL16_HI; 2039 break; 2040 case BFD_RELOC_PPC_DTPREL16_HA: r = R_PPC64_DTPREL16_HA; 2041 break; 2042 case BFD_RELOC_PPC_DTPREL: r = R_PPC64_DTPREL64; 2043 break; 2044 case BFD_RELOC_PPC_GOT_TLSGD16: r = R_PPC64_GOT_TLSGD16; 2045 break; 2046 case BFD_RELOC_PPC_GOT_TLSGD16_LO: r = R_PPC64_GOT_TLSGD16_LO; 2047 break; 2048 case BFD_RELOC_PPC_GOT_TLSGD16_HI: r = R_PPC64_GOT_TLSGD16_HI; 2049 break; 2050 case BFD_RELOC_PPC_GOT_TLSGD16_HA: r = R_PPC64_GOT_TLSGD16_HA; 2051 break; 2052 case BFD_RELOC_PPC_GOT_TLSLD16: r = R_PPC64_GOT_TLSLD16; 2053 break; 2054 case BFD_RELOC_PPC_GOT_TLSLD16_LO: r = R_PPC64_GOT_TLSLD16_LO; 2055 break; 2056 case BFD_RELOC_PPC_GOT_TLSLD16_HI: r = R_PPC64_GOT_TLSLD16_HI; 2057 break; 2058 case BFD_RELOC_PPC_GOT_TLSLD16_HA: r = R_PPC64_GOT_TLSLD16_HA; 2059 break; 2060 case BFD_RELOC_PPC_GOT_TPREL16: r = R_PPC64_GOT_TPREL16_DS; 2061 break; 2062 case BFD_RELOC_PPC_GOT_TPREL16_LO: r = R_PPC64_GOT_TPREL16_LO_DS; 2063 break; 2064 case BFD_RELOC_PPC_GOT_TPREL16_HI: r = R_PPC64_GOT_TPREL16_HI; 2065 break; 2066 case BFD_RELOC_PPC_GOT_TPREL16_HA: r = R_PPC64_GOT_TPREL16_HA; 2067 break; 2068 case BFD_RELOC_PPC_GOT_DTPREL16: r = R_PPC64_GOT_DTPREL16_DS; 2069 break; 2070 case BFD_RELOC_PPC_GOT_DTPREL16_LO: r = R_PPC64_GOT_DTPREL16_LO_DS; 2071 break; 2072 case BFD_RELOC_PPC_GOT_DTPREL16_HI: r = R_PPC64_GOT_DTPREL16_HI; 2073 break; 2074 case BFD_RELOC_PPC_GOT_DTPREL16_HA: r = R_PPC64_GOT_DTPREL16_HA; 2075 break; 2076 case BFD_RELOC_PPC64_TPREL16_DS: r = R_PPC64_TPREL16_DS; 2077 break; 2078 case BFD_RELOC_PPC64_TPREL16_LO_DS: r = R_PPC64_TPREL16_LO_DS; 2079 break; 2080 case BFD_RELOC_PPC64_TPREL16_HIGHER: r = R_PPC64_TPREL16_HIGHER; 2081 break; 2082 case BFD_RELOC_PPC64_TPREL16_HIGHERA: r = R_PPC64_TPREL16_HIGHERA; 2083 break; 2084 case BFD_RELOC_PPC64_TPREL16_HIGHEST: r = R_PPC64_TPREL16_HIGHEST; 2085 break; 2086 case BFD_RELOC_PPC64_TPREL16_HIGHESTA: r = R_PPC64_TPREL16_HIGHESTA; 2087 break; 2088 case BFD_RELOC_PPC64_DTPREL16_DS: r = R_PPC64_DTPREL16_DS; 2089 break; 2090 case BFD_RELOC_PPC64_DTPREL16_LO_DS: r = R_PPC64_DTPREL16_LO_DS; 2091 break; 2092 case BFD_RELOC_PPC64_DTPREL16_HIGHER: r = R_PPC64_DTPREL16_HIGHER; 2093 break; 2094 case BFD_RELOC_PPC64_DTPREL16_HIGHERA: r = R_PPC64_DTPREL16_HIGHERA; 2095 break; 2096 case BFD_RELOC_PPC64_DTPREL16_HIGHEST: r = R_PPC64_DTPREL16_HIGHEST; 2097 break; 2098 case BFD_RELOC_PPC64_DTPREL16_HIGHESTA: r = R_PPC64_DTPREL16_HIGHESTA; 2099 break; 2100 case BFD_RELOC_VTABLE_INHERIT: r = R_PPC64_GNU_VTINHERIT; 2101 break; 2102 case BFD_RELOC_VTABLE_ENTRY: r = R_PPC64_GNU_VTENTRY; 2103 break; 2104 } 2105 2106 return ppc64_elf_howto_table[r]; 2107}; 2108 2109/* Set the howto pointer for a PowerPC ELF reloc. */ 2110 2111static void 2112ppc64_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, 2113 Elf_Internal_Rela *dst) 2114{ 2115 unsigned int type; 2116 2117 /* Initialize howto table if needed. */ 2118 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 2119 ppc_howto_init (); 2120 2121 type = ELF64_R_TYPE (dst->r_info); 2122 if (type >= (sizeof (ppc64_elf_howto_table) 2123 / sizeof (ppc64_elf_howto_table[0]))) 2124 { 2125 (*_bfd_error_handler) (_("%B: invalid relocation type %d"), 2126 abfd, (int) type); 2127 type = R_PPC64_NONE; 2128 } 2129 cache_ptr->howto = ppc64_elf_howto_table[type]; 2130} 2131 2132/* Handle the R_PPC64_ADDR16_HA and similar relocs. */ 2133 2134static bfd_reloc_status_type 2135ppc64_elf_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2136 void *data, asection *input_section, 2137 bfd *output_bfd, char **error_message) 2138{ 2139 /* If this is a relocatable link (output_bfd test tells us), just 2140 call the generic function. Any adjustment will be done at final 2141 link time. */ 2142 if (output_bfd != NULL) 2143 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2144 input_section, output_bfd, error_message); 2145 2146 /* Adjust the addend for sign extension of the low 16 bits. 2147 We won't actually be using the low 16 bits, so trashing them 2148 doesn't matter. */ 2149 reloc_entry->addend += 0x8000; 2150 return bfd_reloc_continue; 2151} 2152 2153static bfd_reloc_status_type 2154ppc64_elf_branch_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2155 void *data, asection *input_section, 2156 bfd *output_bfd, char **error_message) 2157{ 2158 if (output_bfd != NULL) 2159 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2160 input_section, output_bfd, error_message); 2161 2162 if (strcmp (symbol->section->name, ".opd") == 0 2163 && (symbol->section->owner->flags & DYNAMIC) == 0) 2164 { 2165 bfd_vma dest = opd_entry_value (symbol->section, 2166 symbol->value + reloc_entry->addend, 2167 NULL, NULL); 2168 if (dest != (bfd_vma) -1) 2169 reloc_entry->addend = dest - (symbol->value 2170 + symbol->section->output_section->vma 2171 + symbol->section->output_offset); 2172 } 2173 return bfd_reloc_continue; 2174} 2175 2176static bfd_reloc_status_type 2177ppc64_elf_brtaken_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2178 void *data, asection *input_section, 2179 bfd *output_bfd, char **error_message) 2180{ 2181 long insn; 2182 enum elf_ppc64_reloc_type r_type; 2183 bfd_size_type octets; 2184 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */ 2185 bfd_boolean is_power4 = FALSE; 2186 2187 /* If this is a relocatable link (output_bfd test tells us), just 2188 call the generic function. Any adjustment will be done at final 2189 link time. */ 2190 if (output_bfd != NULL) 2191 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2192 input_section, output_bfd, error_message); 2193 2194 octets = reloc_entry->address * bfd_octets_per_byte (abfd); 2195 insn = bfd_get_32 (abfd, (bfd_byte *) data + octets); 2196 insn &= ~(0x01 << 21); 2197 r_type = reloc_entry->howto->type; 2198 if (r_type == R_PPC64_ADDR14_BRTAKEN 2199 || r_type == R_PPC64_REL14_BRTAKEN) 2200 insn |= 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */ 2201 2202 if (is_power4) 2203 { 2204 /* Set 'a' bit. This is 0b00010 in BO field for branch 2205 on CR(BI) insns (BO == 001at or 011at), and 0b01000 2206 for branch on CTR insns (BO == 1a00t or 1a01t). */ 2207 if ((insn & (0x14 << 21)) == (0x04 << 21)) 2208 insn |= 0x02 << 21; 2209 else if ((insn & (0x14 << 21)) == (0x10 << 21)) 2210 insn |= 0x08 << 21; 2211 else 2212 goto out; 2213 } 2214 else 2215 { 2216 bfd_vma target = 0; 2217 bfd_vma from; 2218 2219 if (!bfd_is_com_section (symbol->section)) 2220 target = symbol->value; 2221 target += symbol->section->output_section->vma; 2222 target += symbol->section->output_offset; 2223 target += reloc_entry->addend; 2224 2225 from = (reloc_entry->address 2226 + input_section->output_offset 2227 + input_section->output_section->vma); 2228 2229 /* Invert 'y' bit if not the default. */ 2230 if ((bfd_signed_vma) (target - from) < 0) 2231 insn ^= 0x01 << 21; 2232 } 2233 bfd_put_32 (abfd, insn, (bfd_byte *) data + octets); 2234 out: 2235 return ppc64_elf_branch_reloc (abfd, reloc_entry, symbol, data, 2236 input_section, output_bfd, error_message); 2237} 2238 2239static bfd_reloc_status_type 2240ppc64_elf_sectoff_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2241 void *data, asection *input_section, 2242 bfd *output_bfd, char **error_message) 2243{ 2244 /* If this is a relocatable link (output_bfd test tells us), just 2245 call the generic function. Any adjustment will be done at final 2246 link time. */ 2247 if (output_bfd != NULL) 2248 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2249 input_section, output_bfd, error_message); 2250 2251 /* Subtract the symbol section base address. */ 2252 reloc_entry->addend -= symbol->section->output_section->vma; 2253 return bfd_reloc_continue; 2254} 2255 2256static bfd_reloc_status_type 2257ppc64_elf_sectoff_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2258 void *data, asection *input_section, 2259 bfd *output_bfd, char **error_message) 2260{ 2261 /* If this is a relocatable link (output_bfd test tells us), just 2262 call the generic function. Any adjustment will be done at final 2263 link time. */ 2264 if (output_bfd != NULL) 2265 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2266 input_section, output_bfd, error_message); 2267 2268 /* Subtract the symbol section base address. */ 2269 reloc_entry->addend -= symbol->section->output_section->vma; 2270 2271 /* Adjust the addend for sign extension of the low 16 bits. */ 2272 reloc_entry->addend += 0x8000; 2273 return bfd_reloc_continue; 2274} 2275 2276static bfd_reloc_status_type 2277ppc64_elf_toc_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2278 void *data, asection *input_section, 2279 bfd *output_bfd, char **error_message) 2280{ 2281 bfd_vma TOCstart; 2282 2283 /* If this is a relocatable link (output_bfd test tells us), just 2284 call the generic function. Any adjustment will be done at final 2285 link time. */ 2286 if (output_bfd != NULL) 2287 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2288 input_section, output_bfd, error_message); 2289 2290 TOCstart = _bfd_get_gp_value (input_section->output_section->owner); 2291 if (TOCstart == 0) 2292 TOCstart = ppc64_elf_toc (input_section->output_section->owner); 2293 2294 /* Subtract the TOC base address. */ 2295 reloc_entry->addend -= TOCstart + TOC_BASE_OFF; 2296 return bfd_reloc_continue; 2297} 2298 2299static bfd_reloc_status_type 2300ppc64_elf_toc_ha_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2301 void *data, asection *input_section, 2302 bfd *output_bfd, char **error_message) 2303{ 2304 bfd_vma TOCstart; 2305 2306 /* If this is a relocatable link (output_bfd test tells us), just 2307 call the generic function. Any adjustment will be done at final 2308 link time. */ 2309 if (output_bfd != NULL) 2310 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2311 input_section, output_bfd, error_message); 2312 2313 TOCstart = _bfd_get_gp_value (input_section->output_section->owner); 2314 if (TOCstart == 0) 2315 TOCstart = ppc64_elf_toc (input_section->output_section->owner); 2316 2317 /* Subtract the TOC base address. */ 2318 reloc_entry->addend -= TOCstart + TOC_BASE_OFF; 2319 2320 /* Adjust the addend for sign extension of the low 16 bits. */ 2321 reloc_entry->addend += 0x8000; 2322 return bfd_reloc_continue; 2323} 2324 2325static bfd_reloc_status_type 2326ppc64_elf_toc64_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2327 void *data, asection *input_section, 2328 bfd *output_bfd, char **error_message) 2329{ 2330 bfd_vma TOCstart; 2331 bfd_size_type octets; 2332 2333 /* If this is a relocatable link (output_bfd test tells us), just 2334 call the generic function. Any adjustment will be done at final 2335 link time. */ 2336 if (output_bfd != NULL) 2337 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2338 input_section, output_bfd, error_message); 2339 2340 TOCstart = _bfd_get_gp_value (input_section->output_section->owner); 2341 if (TOCstart == 0) 2342 TOCstart = ppc64_elf_toc (input_section->output_section->owner); 2343 2344 octets = reloc_entry->address * bfd_octets_per_byte (abfd); 2345 bfd_put_64 (abfd, TOCstart + TOC_BASE_OFF, (bfd_byte *) data + octets); 2346 return bfd_reloc_ok; 2347} 2348 2349static bfd_reloc_status_type 2350ppc64_elf_unhandled_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, 2351 void *data, asection *input_section, 2352 bfd *output_bfd, char **error_message) 2353{ 2354 /* If this is a relocatable link (output_bfd test tells us), just 2355 call the generic function. Any adjustment will be done at final 2356 link time. */ 2357 if (output_bfd != NULL) 2358 return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, 2359 input_section, output_bfd, error_message); 2360 2361 if (error_message != NULL) 2362 { 2363 static char buf[60]; 2364 sprintf (buf, "generic linker can't handle %s", 2365 reloc_entry->howto->name); 2366 *error_message = buf; 2367 } 2368 return bfd_reloc_dangerous; 2369} 2370 2371struct ppc64_elf_obj_tdata 2372{ 2373 struct elf_obj_tdata elf; 2374 2375 /* Shortcuts to dynamic linker sections. */ 2376 asection *got; 2377 asection *relgot; 2378 2379 union { 2380 /* Used during garbage collection. We attach global symbols defined 2381 on removed .opd entries to this section so that the sym is removed. */ 2382 asection *deleted_section; 2383 2384 /* Used when adding symbols. */ 2385 bfd_boolean has_dotsym; 2386 } u; 2387 2388 /* TLS local dynamic got entry handling. Suppose for multiple GOT 2389 sections means we potentially need one of these for each input bfd. */ 2390 union { 2391 bfd_signed_vma refcount; 2392 bfd_vma offset; 2393 } tlsld_got; 2394 2395 /* A copy of relocs before they are modified for --emit-relocs. */ 2396 Elf_Internal_Rela *opd_relocs; 2397}; 2398 2399#define ppc64_elf_tdata(bfd) \ 2400 ((struct ppc64_elf_obj_tdata *) (bfd)->tdata.any) 2401 2402#define ppc64_tlsld_got(bfd) \ 2403 (&ppc64_elf_tdata (bfd)->tlsld_got) 2404 2405/* Override the generic function because we store some extras. */ 2406 2407static bfd_boolean 2408ppc64_elf_mkobject (bfd *abfd) 2409{ 2410 bfd_size_type amt = sizeof (struct ppc64_elf_obj_tdata); 2411 abfd->tdata.any = bfd_zalloc (abfd, amt); 2412 if (abfd->tdata.any == NULL) 2413 return FALSE; 2414 return TRUE; 2415} 2416 2417/* Return 1 if target is one of ours. */ 2418 2419static bfd_boolean 2420is_ppc64_elf_target (const struct bfd_target *targ) 2421{ 2422 extern const bfd_target bfd_elf64_powerpc_vec; 2423 extern const bfd_target bfd_elf64_powerpcle_vec; 2424 2425 return targ == &bfd_elf64_powerpc_vec || targ == &bfd_elf64_powerpcle_vec; 2426} 2427 2428/* Fix bad default arch selected for a 64 bit input bfd when the 2429 default is 32 bit. */ 2430 2431static bfd_boolean 2432ppc64_elf_object_p (bfd *abfd) 2433{ 2434 if (abfd->arch_info->the_default && abfd->arch_info->bits_per_word == 32) 2435 { 2436 Elf_Internal_Ehdr *i_ehdr = elf_elfheader (abfd); 2437 2438 if (i_ehdr->e_ident[EI_CLASS] == ELFCLASS64) 2439 { 2440 /* Relies on arch after 32 bit default being 64 bit default. */ 2441 abfd->arch_info = abfd->arch_info->next; 2442 BFD_ASSERT (abfd->arch_info->bits_per_word == 64); 2443 } 2444 } 2445 return TRUE; 2446} 2447 2448/* Support for core dump NOTE sections. */ 2449 2450static bfd_boolean 2451ppc64_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) 2452{ 2453 size_t offset, size; 2454 2455 if (note->descsz != 504) 2456 return FALSE; 2457 2458 /* pr_cursig */ 2459 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); 2460 2461 /* pr_pid */ 2462 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 32); 2463 2464 /* pr_reg */ 2465 offset = 112; 2466 size = 384; 2467 2468 /* Make a ".reg/999" section. */ 2469 return _bfd_elfcore_make_pseudosection (abfd, ".reg", 2470 size, note->descpos + offset); 2471} 2472 2473static bfd_boolean 2474ppc64_elf_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) 2475{ 2476 if (note->descsz != 136) 2477 return FALSE; 2478 2479 elf_tdata (abfd)->core_program 2480 = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16); 2481 elf_tdata (abfd)->core_command 2482 = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80); 2483 2484 return TRUE; 2485} 2486 2487/* Merge backend specific data from an object file to the output 2488 object file when linking. */ 2489 2490static bfd_boolean 2491ppc64_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) 2492{ 2493 /* Check if we have the same endianess. */ 2494 if (ibfd->xvec->byteorder != obfd->xvec->byteorder 2495 && ibfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN 2496 && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN) 2497 { 2498 const char *msg; 2499 2500 if (bfd_big_endian (ibfd)) 2501 msg = _("%B: compiled for a big endian system " 2502 "and target is little endian"); 2503 else 2504 msg = _("%B: compiled for a little endian system " 2505 "and target is big endian"); 2506 2507 (*_bfd_error_handler) (msg, ibfd); 2508 2509 bfd_set_error (bfd_error_wrong_format); 2510 return FALSE; 2511 } 2512 2513 return TRUE; 2514} 2515 2516/* Add extra PPC sections. */ 2517 2518static const struct bfd_elf_special_section ppc64_elf_special_sections[]= 2519{ 2520 { ".plt", 4, 0, SHT_NOBITS, 0 }, 2521 { ".sbss", 5, -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, 2522 { ".sdata", 6, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2523 { ".toc", 4, 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2524 { ".toc1", 5, 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, 2525 { ".tocbss", 7, 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, 2526 { NULL, 0, 0, 0, 0 } 2527}; 2528 2529struct _ppc64_elf_section_data 2530{ 2531 struct bfd_elf_section_data elf; 2532 2533 /* An array with one entry for each opd function descriptor. */ 2534 union 2535 { 2536 /* Points to the function code section for local opd entries. */ 2537 asection **func_sec; 2538 /* After editing .opd, adjust references to opd local syms. */ 2539 long *adjust; 2540 } opd; 2541 2542 /* An array for toc sections, indexed by offset/8. 2543 Specifies the relocation symbol index used at a given toc offset. */ 2544 unsigned *t_symndx; 2545}; 2546 2547#define ppc64_elf_section_data(sec) \ 2548 ((struct _ppc64_elf_section_data *) elf_section_data (sec)) 2549 2550static bfd_boolean 2551ppc64_elf_new_section_hook (bfd *abfd, asection *sec) 2552{ 2553 struct _ppc64_elf_section_data *sdata; 2554 bfd_size_type amt = sizeof (*sdata); 2555 2556 sdata = bfd_zalloc (abfd, amt); 2557 if (sdata == NULL) 2558 return FALSE; 2559 sec->used_by_bfd = sdata; 2560 2561 return _bfd_elf_new_section_hook (abfd, sec); 2562} 2563 2564static void * 2565get_opd_info (asection * sec) 2566{ 2567 if (sec != NULL 2568 && ppc64_elf_section_data (sec) != NULL 2569 && ppc64_elf_section_data (sec)->opd.adjust != NULL) 2570 return ppc64_elf_section_data (sec)->opd.adjust; 2571 return NULL; 2572} 2573 2574/* Parameters for the qsort hook. */ 2575static asection *synthetic_opd; 2576static bfd_boolean synthetic_relocatable; 2577 2578/* qsort comparison function for ppc64_elf_get_synthetic_symtab. */ 2579 2580static int 2581compare_symbols (const void *ap, const void *bp) 2582{ 2583 const asymbol *a = * (const asymbol **) ap; 2584 const asymbol *b = * (const asymbol **) bp; 2585 2586 /* Section symbols first. */ 2587 if ((a->flags & BSF_SECTION_SYM) && !(b->flags & BSF_SECTION_SYM)) 2588 return -1; 2589 if (!(a->flags & BSF_SECTION_SYM) && (b->flags & BSF_SECTION_SYM)) 2590 return 1; 2591 2592 /* then .opd symbols. */ 2593 if (a->section == synthetic_opd && b->section != synthetic_opd) 2594 return -1; 2595 if (a->section != synthetic_opd && b->section == synthetic_opd) 2596 return 1; 2597 2598 /* then other code symbols. */ 2599 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2600 == (SEC_CODE | SEC_ALLOC) 2601 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2602 != (SEC_CODE | SEC_ALLOC)) 2603 return -1; 2604 2605 if ((a->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2606 != (SEC_CODE | SEC_ALLOC) 2607 && (b->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2608 == (SEC_CODE | SEC_ALLOC)) 2609 return 1; 2610 2611 if (synthetic_relocatable) 2612 { 2613 if (a->section->id < b->section->id) 2614 return -1; 2615 2616 if (a->section->id > b->section->id) 2617 return 1; 2618 } 2619 2620 if (a->value + a->section->vma < b->value + b->section->vma) 2621 return -1; 2622 2623 if (a->value + a->section->vma > b->value + b->section->vma) 2624 return 1; 2625 2626 /* For syms with the same value, prefer strong dynamic global function 2627 syms over other syms. */ 2628 if ((a->flags & BSF_GLOBAL) != 0 && (b->flags & BSF_GLOBAL) == 0) 2629 return -1; 2630 2631 if ((a->flags & BSF_GLOBAL) == 0 && (b->flags & BSF_GLOBAL) != 0) 2632 return 1; 2633 2634 if ((a->flags & BSF_FUNCTION) != 0 && (b->flags & BSF_FUNCTION) == 0) 2635 return -1; 2636 2637 if ((a->flags & BSF_FUNCTION) == 0 && (b->flags & BSF_FUNCTION) != 0) 2638 return 1; 2639 2640 if ((a->flags & BSF_WEAK) == 0 && (b->flags & BSF_WEAK) != 0) 2641 return -1; 2642 2643 if ((a->flags & BSF_WEAK) != 0 && (b->flags & BSF_WEAK) == 0) 2644 return 1; 2645 2646 if ((a->flags & BSF_DYNAMIC) != 0 && (b->flags & BSF_DYNAMIC) == 0) 2647 return -1; 2648 2649 if ((a->flags & BSF_DYNAMIC) == 0 && (b->flags & BSF_DYNAMIC) != 0) 2650 return 1; 2651 2652 return 0; 2653} 2654 2655/* Search SYMS for a symbol of the given VALUE. */ 2656 2657static asymbol * 2658sym_exists_at (asymbol **syms, long lo, long hi, int id, bfd_vma value) 2659{ 2660 long mid; 2661 2662 if (id == -1) 2663 { 2664 while (lo < hi) 2665 { 2666 mid = (lo + hi) >> 1; 2667 if (syms[mid]->value + syms[mid]->section->vma < value) 2668 lo = mid + 1; 2669 else if (syms[mid]->value + syms[mid]->section->vma > value) 2670 hi = mid; 2671 else 2672 return syms[mid]; 2673 } 2674 } 2675 else 2676 { 2677 while (lo < hi) 2678 { 2679 mid = (lo + hi) >> 1; 2680 if (syms[mid]->section->id < id) 2681 lo = mid + 1; 2682 else if (syms[mid]->section->id > id) 2683 hi = mid; 2684 else if (syms[mid]->value < value) 2685 lo = mid + 1; 2686 else if (syms[mid]->value > value) 2687 hi = mid; 2688 else 2689 return syms[mid]; 2690 } 2691 } 2692 return NULL; 2693} 2694 2695/* Create synthetic symbols, effectively restoring "dot-symbol" function 2696 entry syms. */ 2697 2698static long 2699ppc64_elf_get_synthetic_symtab (bfd *abfd, 2700 long static_count, asymbol **static_syms, 2701 long dyn_count, asymbol **dyn_syms, 2702 asymbol **ret) 2703{ 2704 asymbol *s; 2705 long i; 2706 long count; 2707 char *names; 2708 long symcount, codesecsym, codesecsymend, secsymend, opdsymend; 2709 asection *opd; 2710 bfd_boolean relocatable = (abfd->flags & (EXEC_P | DYNAMIC)) == 0; 2711 asymbol **syms; 2712 2713 *ret = NULL; 2714 2715 opd = bfd_get_section_by_name (abfd, ".opd"); 2716 if (opd == NULL) 2717 return 0; 2718 2719 symcount = static_count; 2720 if (!relocatable) 2721 symcount += dyn_count; 2722 if (symcount == 0) 2723 return 0; 2724 2725 syms = bfd_malloc ((symcount + 1) * sizeof (*syms)); 2726 if (syms == NULL) 2727 return -1; 2728 2729 if (!relocatable && static_count != 0 && dyn_count != 0) 2730 { 2731 /* Use both symbol tables. */ 2732 memcpy (syms, static_syms, static_count * sizeof (*syms)); 2733 memcpy (syms + static_count, dyn_syms, (dyn_count + 1) * sizeof (*syms)); 2734 } 2735 else if (!relocatable && static_count == 0) 2736 memcpy (syms, dyn_syms, (symcount + 1) * sizeof (*syms)); 2737 else 2738 memcpy (syms, static_syms, (symcount + 1) * sizeof (*syms)); 2739 2740 synthetic_opd = opd; 2741 synthetic_relocatable = relocatable; 2742 qsort (syms, symcount, sizeof (*syms), compare_symbols); 2743 2744 if (!relocatable && symcount > 1) 2745 { 2746 long j; 2747 /* Trim duplicate syms, since we may have merged the normal and 2748 dynamic symbols. Actually, we only care about syms that have 2749 different values, so trim any with the same value. */ 2750 for (i = 1, j = 1; i < symcount; ++i) 2751 if (syms[i - 1]->value + syms[i - 1]->section->vma 2752 != syms[i]->value + syms[i]->section->vma) 2753 syms[j++] = syms[i]; 2754 symcount = j; 2755 } 2756 2757 i = 0; 2758 if (syms[i]->section == opd) 2759 ++i; 2760 codesecsym = i; 2761 2762 for (; i < symcount; ++i) 2763 if (((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2764 != (SEC_CODE | SEC_ALLOC)) 2765 || (syms[i]->flags & BSF_SECTION_SYM) == 0) 2766 break; 2767 codesecsymend = i; 2768 2769 for (; i < symcount; ++i) 2770 if ((syms[i]->flags & BSF_SECTION_SYM) == 0) 2771 break; 2772 secsymend = i; 2773 2774 for (; i < symcount; ++i) 2775 if (syms[i]->section != opd) 2776 break; 2777 opdsymend = i; 2778 2779 for (; i < symcount; ++i) 2780 if ((syms[i]->section->flags & (SEC_CODE | SEC_ALLOC | SEC_THREAD_LOCAL)) 2781 != (SEC_CODE | SEC_ALLOC)) 2782 break; 2783 symcount = i; 2784 2785 count = 0; 2786 if (opdsymend == secsymend) 2787 goto done; 2788 2789 if (relocatable) 2790 { 2791 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean); 2792 arelent *r; 2793 size_t size; 2794 long relcount; 2795 2796 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table; 2797 relcount = (opd->flags & SEC_RELOC) ? opd->reloc_count : 0; 2798 if (relcount == 0) 2799 goto done; 2800 2801 if (!(*slurp_relocs) (abfd, opd, static_syms, FALSE)) 2802 { 2803 count = -1; 2804 goto done; 2805 } 2806 2807 size = 0; 2808 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i) 2809 { 2810 asymbol *sym; 2811 2812 while (r < opd->relocation + relcount 2813 && r->address < syms[i]->value + opd->vma) 2814 ++r; 2815 2816 if (r == opd->relocation + relcount) 2817 break; 2818 2819 if (r->address != syms[i]->value + opd->vma) 2820 continue; 2821 2822 if (r->howto->type != R_PPC64_ADDR64) 2823 continue; 2824 2825 sym = *r->sym_ptr_ptr; 2826 if (!sym_exists_at (syms, opdsymend, symcount, 2827 sym->section->id, sym->value + r->addend)) 2828 { 2829 ++count; 2830 size += sizeof (asymbol); 2831 size += strlen (syms[i]->name) + 2; 2832 } 2833 } 2834 2835 s = *ret = bfd_malloc (size); 2836 if (s == NULL) 2837 { 2838 count = -1; 2839 goto done; 2840 } 2841 2842 names = (char *) (s + count); 2843 2844 for (i = secsymend, r = opd->relocation; i < opdsymend; ++i) 2845 { 2846 asymbol *sym; 2847 2848 while (r < opd->relocation + relcount 2849 && r->address < syms[i]->value + opd->vma) 2850 ++r; 2851 2852 if (r == opd->relocation + relcount) 2853 break; 2854 2855 if (r->address != syms[i]->value + opd->vma) 2856 continue; 2857 2858 if (r->howto->type != R_PPC64_ADDR64) 2859 continue; 2860 2861 sym = *r->sym_ptr_ptr; 2862 if (!sym_exists_at (syms, opdsymend, symcount, 2863 sym->section->id, sym->value + r->addend)) 2864 { 2865 size_t len; 2866 2867 *s = *syms[i]; 2868 s->section = sym->section; 2869 s->value = sym->value + r->addend; 2870 s->name = names; 2871 *names++ = '.'; 2872 len = strlen (syms[i]->name); 2873 memcpy (names, syms[i]->name, len + 1); 2874 names += len + 1; 2875 s++; 2876 } 2877 } 2878 } 2879 else 2880 { 2881 bfd_byte *contents; 2882 size_t size; 2883 2884 if (!bfd_malloc_and_get_section (abfd, opd, &contents)) 2885 { 2886 if (contents) 2887 { 2888 free_contents_and_exit: 2889 free (contents); 2890 } 2891 count = -1; 2892 goto done; 2893 } 2894 2895 size = 0; 2896 for (i = secsymend; i < opdsymend; ++i) 2897 { 2898 bfd_vma ent; 2899 2900 ent = bfd_get_64 (abfd, contents + syms[i]->value); 2901 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent)) 2902 { 2903 ++count; 2904 size += sizeof (asymbol); 2905 size += strlen (syms[i]->name) + 2; 2906 } 2907 } 2908 2909 s = *ret = bfd_malloc (size); 2910 if (s == NULL) 2911 goto free_contents_and_exit; 2912 2913 names = (char *) (s + count); 2914 2915 for (i = secsymend; i < opdsymend; ++i) 2916 { 2917 bfd_vma ent; 2918 2919 ent = bfd_get_64 (abfd, contents + syms[i]->value); 2920 if (!sym_exists_at (syms, opdsymend, symcount, -1, ent)) 2921 { 2922 long lo, hi; 2923 size_t len; 2924 asection *sec = abfd->sections; 2925 2926 *s = *syms[i]; 2927 lo = codesecsym; 2928 hi = codesecsymend; 2929 while (lo < hi) 2930 { 2931 long mid = (lo + hi) >> 1; 2932 if (syms[mid]->section->vma < ent) 2933 lo = mid + 1; 2934 else if (syms[mid]->section->vma > ent) 2935 hi = mid; 2936 else 2937 { 2938 sec = syms[mid]->section; 2939 break; 2940 } 2941 } 2942 2943 if (lo >= hi && lo > codesecsym) 2944 sec = syms[lo - 1]->section; 2945 2946 for (; sec != NULL; sec = sec->next) 2947 { 2948 if (sec->vma > ent) 2949 break; 2950 if ((sec->flags & SEC_ALLOC) == 0 2951 || (sec->flags & SEC_LOAD) == 0) 2952 break; 2953 if ((sec->flags & SEC_CODE) != 0) 2954 s->section = sec; 2955 } 2956 s->value = ent - s->section->vma; 2957 s->name = names; 2958 *names++ = '.'; 2959 len = strlen (syms[i]->name); 2960 memcpy (names, syms[i]->name, len + 1); 2961 names += len + 1; 2962 s++; 2963 } 2964 } 2965 free (contents); 2966 } 2967 2968 done: 2969 free (syms); 2970 return count; 2971} 2972 2973/* The following functions are specific to the ELF linker, while 2974 functions above are used generally. Those named ppc64_elf_* are 2975 called by the main ELF linker code. They appear in this file more 2976 or less in the order in which they are called. eg. 2977 ppc64_elf_check_relocs is called early in the link process, 2978 ppc64_elf_finish_dynamic_sections is one of the last functions 2979 called. 2980 2981 PowerPC64-ELF uses a similar scheme to PowerPC64-XCOFF in that 2982 functions have both a function code symbol and a function descriptor 2983 symbol. A call to foo in a relocatable object file looks like: 2984 2985 . .text 2986 . x: 2987 . bl .foo 2988 . nop 2989 2990 The function definition in another object file might be: 2991 2992 . .section .opd 2993 . foo: .quad .foo 2994 . .quad .TOC.@tocbase 2995 . .quad 0 2996 . 2997 . .text 2998 . .foo: blr 2999 3000 When the linker resolves the call during a static link, the branch 3001 unsurprisingly just goes to .foo and the .opd information is unused. 3002 If the function definition is in a shared library, things are a little 3003 different: The call goes via a plt call stub, the opd information gets 3004 copied to the plt, and the linker patches the nop. 3005 3006 . x: 3007 . bl .foo_stub 3008 . ld 2,40(1) 3009 . 3010 . 3011 . .foo_stub: 3012 . addis 12,2,Lfoo@toc@ha # in practice, the call stub 3013 . addi 12,12,Lfoo@toc@l # is slightly optimized, but 3014 . std 2,40(1) # this is the general idea 3015 . ld 11,0(12) 3016 . ld 2,8(12) 3017 . mtctr 11 3018 . ld 11,16(12) 3019 . bctr 3020 . 3021 . .section .plt 3022 . Lfoo: reloc (R_PPC64_JMP_SLOT, foo) 3023 3024 The "reloc ()" notation is supposed to indicate that the linker emits 3025 an R_PPC64_JMP_SLOT reloc against foo. The dynamic linker does the opd 3026 copying. 3027 3028 What are the difficulties here? Well, firstly, the relocations 3029 examined by the linker in check_relocs are against the function code 3030 sym .foo, while the dynamic relocation in the plt is emitted against 3031 the function descriptor symbol, foo. Somewhere along the line, we need 3032 to carefully copy dynamic link information from one symbol to the other. 3033 Secondly, the generic part of the elf linker will make .foo a dynamic 3034 symbol as is normal for most other backends. We need foo dynamic 3035 instead, at least for an application final link. However, when 3036 creating a shared library containing foo, we need to have both symbols 3037 dynamic so that references to .foo are satisfied during the early 3038 stages of linking. Otherwise the linker might decide to pull in a 3039 definition from some other object, eg. a static library. 3040 3041 Update: As of August 2004, we support a new convention. Function 3042 calls may use the function descriptor symbol, ie. "bl foo". This 3043 behaves exactly as "bl .foo". */ 3044 3045/* The linker needs to keep track of the number of relocs that it 3046 decides to copy as dynamic relocs in check_relocs for each symbol. 3047 This is so that it can later discard them if they are found to be 3048 unnecessary. We store the information in a field extending the 3049 regular ELF linker hash table. */ 3050 3051struct ppc_dyn_relocs 3052{ 3053 struct ppc_dyn_relocs *next; 3054 3055 /* The input section of the reloc. */ 3056 asection *sec; 3057 3058 /* Total number of relocs copied for the input section. */ 3059 bfd_size_type count; 3060 3061 /* Number of pc-relative relocs copied for the input section. */ 3062 bfd_size_type pc_count; 3063}; 3064 3065/* Track GOT entries needed for a given symbol. We might need more 3066 than one got entry per symbol. */ 3067struct got_entry 3068{ 3069 struct got_entry *next; 3070 3071 /* The symbol addend that we'll be placing in the GOT. */ 3072 bfd_vma addend; 3073 3074 /* Unlike other ELF targets, we use separate GOT entries for the same 3075 symbol referenced from different input files. This is to support 3076 automatic multiple TOC/GOT sections, where the TOC base can vary 3077 from one input file to another. 3078 3079 Point to the BFD owning this GOT entry. */ 3080 bfd *owner; 3081 3082 /* Zero for non-tls entries, or TLS_TLS and one of TLS_GD, TLS_LD, 3083 TLS_TPREL or TLS_DTPREL for tls entries. */ 3084 char tls_type; 3085 3086 /* Reference count until size_dynamic_sections, GOT offset thereafter. */ 3087 union 3088 { 3089 bfd_signed_vma refcount; 3090 bfd_vma offset; 3091 } got; 3092}; 3093 3094/* The same for PLT. */ 3095struct plt_entry 3096{ 3097 struct plt_entry *next; 3098 3099 bfd_vma addend; 3100 3101 union 3102 { 3103 bfd_signed_vma refcount; 3104 bfd_vma offset; 3105 } plt; 3106}; 3107 3108/* Of those relocs that might be copied as dynamic relocs, this macro 3109 selects those that must be copied when linking a shared library, 3110 even when the symbol is local. */ 3111 3112#define MUST_BE_DYN_RELOC(RTYPE) \ 3113 ((RTYPE) != R_PPC64_REL32 \ 3114 && (RTYPE) != R_PPC64_REL64 \ 3115 && (RTYPE) != R_PPC64_REL30) 3116 3117/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid 3118 copying dynamic variables from a shared lib into an app's dynbss 3119 section, and instead use a dynamic relocation to point into the 3120 shared lib. With code that gcc generates, it's vital that this be 3121 enabled; In the PowerPC64 ABI, the address of a function is actually 3122 the address of a function descriptor, which resides in the .opd 3123 section. gcc uses the descriptor directly rather than going via the 3124 GOT as some other ABI's do, which means that initialized function 3125 pointers must reference the descriptor. Thus, a function pointer 3126 initialized to the address of a function in a shared library will 3127 either require a copy reloc, or a dynamic reloc. Using a copy reloc 3128 redefines the function descriptor symbol to point to the copy. This 3129 presents a problem as a plt entry for that function is also 3130 initialized from the function descriptor symbol and the copy reloc 3131 may not be initialized first. */ 3132#define ELIMINATE_COPY_RELOCS 1 3133 3134/* Section name for stubs is the associated section name plus this 3135 string. */ 3136#define STUB_SUFFIX ".stub" 3137 3138/* Linker stubs. 3139 ppc_stub_long_branch: 3140 Used when a 14 bit branch (or even a 24 bit branch) can't reach its 3141 destination, but a 24 bit branch in a stub section will reach. 3142 . b dest 3143 3144 ppc_stub_plt_branch: 3145 Similar to the above, but a 24 bit branch in the stub section won't 3146 reach its destination. 3147 . addis %r12,%r2,xxx@toc@ha 3148 . ld %r11,xxx@toc@l(%r12) 3149 . mtctr %r11 3150 . bctr 3151 3152 ppc_stub_plt_call: 3153 Used to call a function in a shared library. If it so happens that 3154 the plt entry referenced crosses a 64k boundary, then an extra 3155 "addis %r12,%r12,1" will be inserted before the load at xxx+8 or 3156 xxx+16 as appropriate. 3157 . addis %r12,%r2,xxx@toc@ha 3158 . std %r2,40(%r1) 3159 . ld %r11,xxx+0@toc@l(%r12) 3160 . ld %r2,xxx+8@toc@l(%r12) 3161 . mtctr %r11 3162 . ld %r11,xxx+16@toc@l(%r12) 3163 . bctr 3164 3165 ppc_stub_long_branch and ppc_stub_plt_branch may also have additional 3166 code to adjust the value and save r2 to support multiple toc sections. 3167 A ppc_stub_long_branch with an r2 offset looks like: 3168 . std %r2,40(%r1) 3169 . addis %r2,%r2,off@ha 3170 . addi %r2,%r2,off@l 3171 . b dest 3172 3173 A ppc_stub_plt_branch with an r2 offset looks like: 3174 . std %r2,40(%r1) 3175 . addis %r12,%r2,xxx@toc@ha 3176 . ld %r11,xxx@toc@l(%r12) 3177 . addis %r2,%r2,off@ha 3178 . addi %r2,%r2,off@l 3179 . mtctr %r11 3180 . bctr 3181*/ 3182 3183enum ppc_stub_type { 3184 ppc_stub_none, 3185 ppc_stub_long_branch, 3186 ppc_stub_long_branch_r2off, 3187 ppc_stub_plt_branch, 3188 ppc_stub_plt_branch_r2off, 3189 ppc_stub_plt_call 3190}; 3191 3192struct ppc_stub_hash_entry { 3193 3194 /* Base hash table entry structure. */ 3195 struct bfd_hash_entry root; 3196 3197 enum ppc_stub_type stub_type; 3198 3199 /* The stub section. */ 3200 asection *stub_sec; 3201 3202 /* Offset within stub_sec of the beginning of this stub. */ 3203 bfd_vma stub_offset; 3204 3205 /* Given the symbol's value and its section we can determine its final 3206 value when building the stubs (so the stub knows where to jump. */ 3207 bfd_vma target_value; 3208 asection *target_section; 3209 3210 /* The symbol table entry, if any, that this was derived from. */ 3211 struct ppc_link_hash_entry *h; 3212 3213 /* And the reloc addend that this was derived from. */ 3214 bfd_vma addend; 3215 3216 /* Where this stub is being called from, or, in the case of combined 3217 stub sections, the first input section in the group. */ 3218 asection *id_sec; 3219}; 3220 3221struct ppc_branch_hash_entry { 3222 3223 /* Base hash table entry structure. */ 3224 struct bfd_hash_entry root; 3225 3226 /* Offset within branch lookup table. */ 3227 unsigned int offset; 3228 3229 /* Generation marker. */ 3230 unsigned int iter; 3231}; 3232 3233struct ppc_link_hash_entry 3234{ 3235 struct elf_link_hash_entry elf; 3236 3237 /* A pointer to the most recently used stub hash entry against this 3238 symbol. */ 3239 struct ppc_stub_hash_entry *stub_cache; 3240 3241 /* Track dynamic relocs copied for this symbol. */ 3242 struct ppc_dyn_relocs *dyn_relocs; 3243 3244 /* Link between function code and descriptor symbols. */ 3245 struct ppc_link_hash_entry *oh; 3246 3247 /* Flag function code and descriptor symbols. */ 3248 unsigned int is_func:1; 3249 unsigned int is_func_descriptor:1; 3250 unsigned int fake:1; 3251 3252 /* Whether global opd/toc sym has been adjusted or not. 3253 After ppc64_elf_edit_opd/ppc64_elf_edit_toc has run, this flag 3254 should be set for all globals defined in any opd/toc section. */ 3255 unsigned int adjust_done:1; 3256 3257 /* Set if we twiddled this symbol to weak at some stage. */ 3258 unsigned int was_undefined:1; 3259 3260 /* Contexts in which symbol is used in the GOT (or TOC). 3261 TLS_GD .. TLS_EXPLICIT bits are or'd into the mask as the 3262 corresponding relocs are encountered during check_relocs. 3263 tls_optimize clears TLS_GD .. TLS_TPREL when optimizing to 3264 indicate the corresponding GOT entry type is not needed. 3265 tls_optimize may also set TLS_TPRELGD when a GD reloc turns into 3266 a TPREL one. We use a separate flag rather than setting TPREL 3267 just for convenience in distinguishing the two cases. */ 3268#define TLS_GD 1 /* GD reloc. */ 3269#define TLS_LD 2 /* LD reloc. */ 3270#define TLS_TPREL 4 /* TPREL reloc, => IE. */ 3271#define TLS_DTPREL 8 /* DTPREL reloc, => LD. */ 3272#define TLS_TLS 16 /* Any TLS reloc. */ 3273#define TLS_EXPLICIT 32 /* Marks TOC section TLS relocs. */ 3274#define TLS_TPRELGD 64 /* TPREL reloc resulting from GD->IE. */ 3275 char tls_mask; 3276}; 3277 3278/* ppc64 ELF linker hash table. */ 3279 3280struct ppc_link_hash_table 3281{ 3282 struct elf_link_hash_table elf; 3283 3284 /* The stub hash table. */ 3285 struct bfd_hash_table stub_hash_table; 3286 3287 /* Another hash table for plt_branch stubs. */ 3288 struct bfd_hash_table branch_hash_table; 3289 3290 /* Linker stub bfd. */ 3291 bfd *stub_bfd; 3292 3293 /* Linker call-backs. */ 3294 asection * (*add_stub_section) (const char *, asection *); 3295 void (*layout_sections_again) (void); 3296 3297 /* Array to keep track of which stub sections have been created, and 3298 information on stub grouping. */ 3299 struct map_stub { 3300 /* This is the section to which stubs in the group will be attached. */ 3301 asection *link_sec; 3302 /* The stub section. */ 3303 asection *stub_sec; 3304 /* Along with elf_gp, specifies the TOC pointer used in this group. */ 3305 bfd_vma toc_off; 3306 } *stub_group; 3307 3308 /* Temp used when calculating TOC pointers. */ 3309 bfd_vma toc_curr; 3310 3311 /* Highest input section id. */ 3312 int top_id; 3313 3314 /* Highest output section index. */ 3315 int top_index; 3316 3317 /* List of input sections for each output section. */ 3318 asection **input_list; 3319 3320 /* Short-cuts to get to dynamic linker sections. */ 3321 asection *got; 3322 asection *plt; 3323 asection *relplt; 3324 asection *dynbss; 3325 asection *relbss; 3326 asection *glink; 3327 asection *sfpr; 3328 asection *brlt; 3329 asection *relbrlt; 3330 3331 /* Shortcut to .__tls_get_addr and __tls_get_addr. */ 3332 struct ppc_link_hash_entry *tls_get_addr; 3333 struct ppc_link_hash_entry *tls_get_addr_fd; 3334 3335 /* Statistics. */ 3336 unsigned long stub_count[ppc_stub_plt_call]; 3337 3338 /* Number of stubs against global syms. */ 3339 unsigned long stub_globals; 3340 3341 /* Set if we should emit symbols for stubs. */ 3342 unsigned int emit_stub_syms:1; 3343 3344 /* Support for multiple toc sections. */ 3345 unsigned int no_multi_toc:1; 3346 unsigned int multi_toc_needed:1; 3347 3348 /* Set on error. */ 3349 unsigned int stub_error:1; 3350 3351 /* Flag set when small branches are detected. Used to 3352 select suitable defaults for the stub group size. */ 3353 unsigned int has_14bit_branch:1; 3354 3355 /* Temp used by ppc64_elf_check_directives. */ 3356 unsigned int twiddled_syms:1; 3357 3358 /* Incremented every time we size stubs. */ 3359 unsigned int stub_iteration; 3360 3361 /* Small local sym to section mapping cache. */ 3362 struct sym_sec_cache sym_sec; 3363}; 3364 3365/* Rename some of the generic section flags to better document how they 3366 are used here. */ 3367#define has_toc_reloc has_gp_reloc 3368#define makes_toc_func_call need_finalize_relax 3369#define call_check_in_progress reloc_done 3370 3371/* Get the ppc64 ELF linker hash table from a link_info structure. */ 3372 3373#define ppc_hash_table(p) \ 3374 ((struct ppc_link_hash_table *) ((p)->hash)) 3375 3376#define ppc_stub_hash_lookup(table, string, create, copy) \ 3377 ((struct ppc_stub_hash_entry *) \ 3378 bfd_hash_lookup ((table), (string), (create), (copy))) 3379 3380#define ppc_branch_hash_lookup(table, string, create, copy) \ 3381 ((struct ppc_branch_hash_entry *) \ 3382 bfd_hash_lookup ((table), (string), (create), (copy))) 3383 3384/* Create an entry in the stub hash table. */ 3385 3386static struct bfd_hash_entry * 3387stub_hash_newfunc (struct bfd_hash_entry *entry, 3388 struct bfd_hash_table *table, 3389 const char *string) 3390{ 3391 /* Allocate the structure if it has not already been allocated by a 3392 subclass. */ 3393 if (entry == NULL) 3394 { 3395 entry = bfd_hash_allocate (table, sizeof (struct ppc_stub_hash_entry)); 3396 if (entry == NULL) 3397 return entry; 3398 } 3399 3400 /* Call the allocation method of the superclass. */ 3401 entry = bfd_hash_newfunc (entry, table, string); 3402 if (entry != NULL) 3403 { 3404 struct ppc_stub_hash_entry *eh; 3405 3406 /* Initialize the local fields. */ 3407 eh = (struct ppc_stub_hash_entry *) entry; 3408 eh->stub_type = ppc_stub_none; 3409 eh->stub_sec = NULL; 3410 eh->stub_offset = 0; 3411 eh->target_value = 0; 3412 eh->target_section = NULL; 3413 eh->h = NULL; 3414 eh->id_sec = NULL; 3415 } 3416 3417 return entry; 3418} 3419 3420/* Create an entry in the branch hash table. */ 3421 3422static struct bfd_hash_entry * 3423branch_hash_newfunc (struct bfd_hash_entry *entry, 3424 struct bfd_hash_table *table, 3425 const char *string) 3426{ 3427 /* Allocate the structure if it has not already been allocated by a 3428 subclass. */ 3429 if (entry == NULL) 3430 { 3431 entry = bfd_hash_allocate (table, sizeof (struct ppc_branch_hash_entry)); 3432 if (entry == NULL) 3433 return entry; 3434 } 3435 3436 /* Call the allocation method of the superclass. */ 3437 entry = bfd_hash_newfunc (entry, table, string); 3438 if (entry != NULL) 3439 { 3440 struct ppc_branch_hash_entry *eh; 3441 3442 /* Initialize the local fields. */ 3443 eh = (struct ppc_branch_hash_entry *) entry; 3444 eh->offset = 0; 3445 eh->iter = 0; 3446 } 3447 3448 return entry; 3449} 3450 3451/* Create an entry in a ppc64 ELF linker hash table. */ 3452 3453static struct bfd_hash_entry * 3454link_hash_newfunc (struct bfd_hash_entry *entry, 3455 struct bfd_hash_table *table, 3456 const char *string) 3457{ 3458 /* Allocate the structure if it has not already been allocated by a 3459 subclass. */ 3460 if (entry == NULL) 3461 { 3462 entry = bfd_hash_allocate (table, sizeof (struct ppc_link_hash_entry)); 3463 if (entry == NULL) 3464 return entry; 3465 } 3466 3467 /* Call the allocation method of the superclass. */ 3468 entry = _bfd_elf_link_hash_newfunc (entry, table, string); 3469 if (entry != NULL) 3470 { 3471 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) entry; 3472 3473 memset (&eh->stub_cache, 0, 3474 (sizeof (struct ppc_link_hash_entry) 3475 - offsetof (struct ppc_link_hash_entry, stub_cache))); 3476 } 3477 3478 return entry; 3479} 3480 3481/* Create a ppc64 ELF linker hash table. */ 3482 3483static struct bfd_link_hash_table * 3484ppc64_elf_link_hash_table_create (bfd *abfd) 3485{ 3486 struct ppc_link_hash_table *htab; 3487 bfd_size_type amt = sizeof (struct ppc_link_hash_table); 3488 3489 htab = bfd_zmalloc (amt); 3490 if (htab == NULL) 3491 return NULL; 3492 3493 if (!_bfd_elf_link_hash_table_init (&htab->elf, abfd, link_hash_newfunc, 3494 sizeof (struct ppc_link_hash_entry))) 3495 { 3496 free (htab); 3497 return NULL; 3498 } 3499 3500 /* Init the stub hash table too. */ 3501 if (!bfd_hash_table_init (&htab->stub_hash_table, stub_hash_newfunc, 3502 sizeof (struct ppc_stub_hash_entry))) 3503 return NULL; 3504 3505 /* And the branch hash table. */ 3506 if (!bfd_hash_table_init (&htab->branch_hash_table, branch_hash_newfunc, 3507 sizeof (struct ppc_branch_hash_entry))) 3508 return NULL; 3509 3510 /* Initializing two fields of the union is just cosmetic. We really 3511 only care about glist, but when compiled on a 32-bit host the 3512 bfd_vma fields are larger. Setting the bfd_vma to zero makes 3513 debugger inspection of these fields look nicer. */ 3514 htab->elf.init_got_refcount.refcount = 0; 3515 htab->elf.init_got_refcount.glist = NULL; 3516 htab->elf.init_plt_refcount.refcount = 0; 3517 htab->elf.init_plt_refcount.glist = NULL; 3518 htab->elf.init_got_offset.offset = 0; 3519 htab->elf.init_got_offset.glist = NULL; 3520 htab->elf.init_plt_offset.offset = 0; 3521 htab->elf.init_plt_offset.glist = NULL; 3522 3523 return &htab->elf.root; 3524} 3525 3526/* Free the derived linker hash table. */ 3527 3528static void 3529ppc64_elf_link_hash_table_free (struct bfd_link_hash_table *hash) 3530{ 3531 struct ppc_link_hash_table *ret = (struct ppc_link_hash_table *) hash; 3532 3533 bfd_hash_table_free (&ret->stub_hash_table); 3534 bfd_hash_table_free (&ret->branch_hash_table); 3535 _bfd_generic_link_hash_table_free (hash); 3536} 3537 3538/* Satisfy the ELF linker by filling in some fields in our fake bfd. */ 3539 3540void 3541ppc64_elf_init_stub_bfd (bfd *abfd, struct bfd_link_info *info) 3542{ 3543 struct ppc_link_hash_table *htab; 3544 3545 elf_elfheader (abfd)->e_ident[EI_CLASS] = ELFCLASS64; 3546 3547/* Always hook our dynamic sections into the first bfd, which is the 3548 linker created stub bfd. This ensures that the GOT header is at 3549 the start of the output TOC section. */ 3550 htab = ppc_hash_table (info); 3551 htab->stub_bfd = abfd; 3552 htab->elf.dynobj = abfd; 3553} 3554 3555/* Build a name for an entry in the stub hash table. */ 3556 3557static char * 3558ppc_stub_name (const asection *input_section, 3559 const asection *sym_sec, 3560 const struct ppc_link_hash_entry *h, 3561 const Elf_Internal_Rela *rel) 3562{ 3563 char *stub_name; 3564 bfd_size_type len; 3565 3566 /* rel->r_addend is actually 64 bit, but who uses more than +/- 2^31 3567 offsets from a sym as a branch target? In fact, we could 3568 probably assume the addend is always zero. */ 3569 BFD_ASSERT (((int) rel->r_addend & 0xffffffff) == rel->r_addend); 3570 3571 if (h) 3572 { 3573 len = 8 + 1 + strlen (h->elf.root.root.string) + 1 + 8 + 1; 3574 stub_name = bfd_malloc (len); 3575 if (stub_name == NULL) 3576 return stub_name; 3577 3578 sprintf (stub_name, "%08x.%s+%x", 3579 input_section->id & 0xffffffff, 3580 h->elf.root.root.string, 3581 (int) rel->r_addend & 0xffffffff); 3582 } 3583 else 3584 { 3585 len = 8 + 1 + 8 + 1 + 8 + 1 + 8 + 1; 3586 stub_name = bfd_malloc (len); 3587 if (stub_name == NULL) 3588 return stub_name; 3589 3590 sprintf (stub_name, "%08x.%x:%x+%x", 3591 input_section->id & 0xffffffff, 3592 sym_sec->id & 0xffffffff, 3593 (int) ELF64_R_SYM (rel->r_info) & 0xffffffff, 3594 (int) rel->r_addend & 0xffffffff); 3595 } 3596 if (stub_name[len - 2] == '+' && stub_name[len - 1] == '0') 3597 stub_name[len - 2] = 0; 3598 return stub_name; 3599} 3600 3601/* Look up an entry in the stub hash. Stub entries are cached because 3602 creating the stub name takes a bit of time. */ 3603 3604static struct ppc_stub_hash_entry * 3605ppc_get_stub_entry (const asection *input_section, 3606 const asection *sym_sec, 3607 struct ppc_link_hash_entry *h, 3608 const Elf_Internal_Rela *rel, 3609 struct ppc_link_hash_table *htab) 3610{ 3611 struct ppc_stub_hash_entry *stub_entry; 3612 const asection *id_sec; 3613 3614 /* If this input section is part of a group of sections sharing one 3615 stub section, then use the id of the first section in the group. 3616 Stub names need to include a section id, as there may well be 3617 more than one stub used to reach say, printf, and we need to 3618 distinguish between them. */ 3619 id_sec = htab->stub_group[input_section->id].link_sec; 3620 3621 if (h != NULL && h->stub_cache != NULL 3622 && h->stub_cache->h == h 3623 && h->stub_cache->id_sec == id_sec) 3624 { 3625 stub_entry = h->stub_cache; 3626 } 3627 else 3628 { 3629 char *stub_name; 3630 3631 stub_name = ppc_stub_name (id_sec, sym_sec, h, rel); 3632 if (stub_name == NULL) 3633 return NULL; 3634 3635 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, 3636 stub_name, FALSE, FALSE); 3637 if (h != NULL) 3638 h->stub_cache = stub_entry; 3639 3640 free (stub_name); 3641 } 3642 3643 return stub_entry; 3644} 3645 3646/* Add a new stub entry to the stub hash. Not all fields of the new 3647 stub entry are initialised. */ 3648 3649static struct ppc_stub_hash_entry * 3650ppc_add_stub (const char *stub_name, 3651 asection *section, 3652 struct ppc_link_hash_table *htab) 3653{ 3654 asection *link_sec; 3655 asection *stub_sec; 3656 struct ppc_stub_hash_entry *stub_entry; 3657 3658 link_sec = htab->stub_group[section->id].link_sec; 3659 stub_sec = htab->stub_group[section->id].stub_sec; 3660 if (stub_sec == NULL) 3661 { 3662 stub_sec = htab->stub_group[link_sec->id].stub_sec; 3663 if (stub_sec == NULL) 3664 { 3665 size_t namelen; 3666 bfd_size_type len; 3667 char *s_name; 3668 3669 namelen = strlen (link_sec->name); 3670 len = namelen + sizeof (STUB_SUFFIX); 3671 s_name = bfd_alloc (htab->stub_bfd, len); 3672 if (s_name == NULL) 3673 return NULL; 3674 3675 memcpy (s_name, link_sec->name, namelen); 3676 memcpy (s_name + namelen, STUB_SUFFIX, sizeof (STUB_SUFFIX)); 3677 stub_sec = (*htab->add_stub_section) (s_name, link_sec); 3678 if (stub_sec == NULL) 3679 return NULL; 3680 htab->stub_group[link_sec->id].stub_sec = stub_sec; 3681 } 3682 htab->stub_group[section->id].stub_sec = stub_sec; 3683 } 3684 3685 /* Enter this entry into the linker stub hash table. */ 3686 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, stub_name, 3687 TRUE, FALSE); 3688 if (stub_entry == NULL) 3689 { 3690 (*_bfd_error_handler) (_("%B: cannot create stub entry %s"), 3691 section->owner, stub_name); 3692 return NULL; 3693 } 3694 3695 stub_entry->stub_sec = stub_sec; 3696 stub_entry->stub_offset = 0; 3697 stub_entry->id_sec = link_sec; 3698 return stub_entry; 3699} 3700 3701/* Create sections for linker generated code. */ 3702 3703static bfd_boolean 3704create_linkage_sections (bfd *dynobj, struct bfd_link_info *info) 3705{ 3706 struct ppc_link_hash_table *htab; 3707 flagword flags; 3708 3709 htab = ppc_hash_table (info); 3710 3711 /* Create .sfpr for code to save and restore fp regs. */ 3712 flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_READONLY 3713 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3714 htab->sfpr = bfd_make_section_anyway_with_flags (dynobj, ".sfpr", 3715 flags); 3716 if (htab->sfpr == NULL 3717 || ! bfd_set_section_alignment (dynobj, htab->sfpr, 2)) 3718 return FALSE; 3719 3720 /* Create .glink for lazy dynamic linking support. */ 3721 htab->glink = bfd_make_section_anyway_with_flags (dynobj, ".glink", 3722 flags); 3723 if (htab->glink == NULL 3724 || ! bfd_set_section_alignment (dynobj, htab->glink, 2)) 3725 return FALSE; 3726 3727 /* Create branch lookup table for plt_branch stubs. */ 3728 if (info->shared) 3729 { 3730 flags = (SEC_ALLOC | SEC_LOAD 3731 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3732 htab->brlt 3733 = bfd_make_section_anyway_with_flags (dynobj, ".data.rel.ro.brlt", 3734 flags); 3735 } 3736 else 3737 { 3738 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY 3739 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3740 htab->brlt 3741 = bfd_make_section_anyway_with_flags (dynobj, ".rodata.brlt", flags); 3742 } 3743 3744 if (htab->brlt == NULL 3745 || ! bfd_set_section_alignment (dynobj, htab->brlt, 3)) 3746 return FALSE; 3747 3748 if (info->shared) 3749 { 3750 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY 3751 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3752 htab->relbrlt 3753 = bfd_make_section_anyway_with_flags (dynobj, ".rela.data.rel.ro.brlt", 3754 flags); 3755 } 3756 else if (info->emitrelocations) 3757 { 3758 flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY 3759 | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); 3760 htab->relbrlt 3761 = bfd_make_section_anyway_with_flags (dynobj, ".rela.rodata.brlt", 3762 flags); 3763 } 3764 else 3765 return TRUE; 3766 3767 if (!htab->relbrlt 3768 || ! bfd_set_section_alignment (dynobj, htab->relbrlt, 3)) 3769 return FALSE; 3770 3771 return TRUE; 3772} 3773 3774/* Create .got and .rela.got sections in ABFD, and .got in dynobj if 3775 not already done. */ 3776 3777static bfd_boolean 3778create_got_section (bfd *abfd, struct bfd_link_info *info) 3779{ 3780 asection *got, *relgot; 3781 flagword flags; 3782 struct ppc_link_hash_table *htab = ppc_hash_table (info); 3783 3784 if (!htab->got) 3785 { 3786 if (! _bfd_elf_create_got_section (htab->elf.dynobj, info)) 3787 return FALSE; 3788 3789 htab->got = bfd_get_section_by_name (htab->elf.dynobj, ".got"); 3790 if (!htab->got) 3791 abort (); 3792 } 3793 3794 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY 3795 | SEC_LINKER_CREATED); 3796 3797 got = bfd_make_section_anyway_with_flags (abfd, ".got", flags); 3798 if (!got 3799 || !bfd_set_section_alignment (abfd, got, 3)) 3800 return FALSE; 3801 3802 relgot = bfd_make_section_anyway_with_flags (abfd, ".rela.got", 3803 flags | SEC_READONLY); 3804 if (!relgot 3805 || ! bfd_set_section_alignment (abfd, relgot, 3)) 3806 return FALSE; 3807 3808 ppc64_elf_tdata (abfd)->got = got; 3809 ppc64_elf_tdata (abfd)->relgot = relgot; 3810 return TRUE; 3811} 3812 3813/* Create the dynamic sections, and set up shortcuts. */ 3814 3815static bfd_boolean 3816ppc64_elf_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) 3817{ 3818 struct ppc_link_hash_table *htab; 3819 3820 if (!_bfd_elf_create_dynamic_sections (dynobj, info)) 3821 return FALSE; 3822 3823 htab = ppc_hash_table (info); 3824 if (!htab->got) 3825 htab->got = bfd_get_section_by_name (dynobj, ".got"); 3826 htab->plt = bfd_get_section_by_name (dynobj, ".plt"); 3827 htab->relplt = bfd_get_section_by_name (dynobj, ".rela.plt"); 3828 htab->dynbss = bfd_get_section_by_name (dynobj, ".dynbss"); 3829 if (!info->shared) 3830 htab->relbss = bfd_get_section_by_name (dynobj, ".rela.bss"); 3831 3832 if (!htab->got || !htab->plt || !htab->relplt || !htab->dynbss 3833 || (!info->shared && !htab->relbss)) 3834 abort (); 3835 3836 return TRUE; 3837} 3838 3839/* Merge PLT info on FROM with that on TO. */ 3840 3841static void 3842move_plt_plist (struct ppc_link_hash_entry *from, 3843 struct ppc_link_hash_entry *to) 3844{ 3845 if (from->elf.plt.plist != NULL) 3846 { 3847 if (to->elf.plt.plist != NULL) 3848 { 3849 struct plt_entry **entp; 3850 struct plt_entry *ent; 3851 3852 for (entp = &from->elf.plt.plist; (ent = *entp) != NULL; ) 3853 { 3854 struct plt_entry *dent; 3855 3856 for (dent = to->elf.plt.plist; dent != NULL; dent = dent->next) 3857 if (dent->addend == ent->addend) 3858 { 3859 dent->plt.refcount += ent->plt.refcount; 3860 *entp = ent->next; 3861 break; 3862 } 3863 if (dent == NULL) 3864 entp = &ent->next; 3865 } 3866 *entp = to->elf.plt.plist; 3867 } 3868 3869 to->elf.plt.plist = from->elf.plt.plist; 3870 from->elf.plt.plist = NULL; 3871 } 3872} 3873 3874/* Copy the extra info we tack onto an elf_link_hash_entry. */ 3875 3876static void 3877ppc64_elf_copy_indirect_symbol (struct bfd_link_info *info, 3878 struct elf_link_hash_entry *dir, 3879 struct elf_link_hash_entry *ind) 3880{ 3881 struct ppc_link_hash_entry *edir, *eind; 3882 3883 edir = (struct ppc_link_hash_entry *) dir; 3884 eind = (struct ppc_link_hash_entry *) ind; 3885 3886 /* Copy over any dynamic relocs we may have on the indirect sym. */ 3887 if (eind->dyn_relocs != NULL) 3888 { 3889 if (edir->dyn_relocs != NULL) 3890 { 3891 struct ppc_dyn_relocs **pp; 3892 struct ppc_dyn_relocs *p; 3893 3894 /* Add reloc counts against the indirect sym to the direct sym 3895 list. Merge any entries against the same section. */ 3896 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) 3897 { 3898 struct ppc_dyn_relocs *q; 3899 3900 for (q = edir->dyn_relocs; q != NULL; q = q->next) 3901 if (q->sec == p->sec) 3902 { 3903 q->pc_count += p->pc_count; 3904 q->count += p->count; 3905 *pp = p->next; 3906 break; 3907 } 3908 if (q == NULL) 3909 pp = &p->next; 3910 } 3911 *pp = edir->dyn_relocs; 3912 } 3913 3914 edir->dyn_relocs = eind->dyn_relocs; 3915 eind->dyn_relocs = NULL; 3916 } 3917 3918 edir->is_func |= eind->is_func; 3919 edir->is_func_descriptor |= eind->is_func_descriptor; 3920 edir->tls_mask |= eind->tls_mask; 3921 3922 /* If called to transfer flags for a weakdef during processing 3923 of elf_adjust_dynamic_symbol, don't copy NON_GOT_REF. 3924 We clear it ourselves for ELIMINATE_COPY_RELOCS. */ 3925 if (!(ELIMINATE_COPY_RELOCS 3926 && eind->elf.root.type != bfd_link_hash_indirect 3927 && edir->elf.dynamic_adjusted)) 3928 edir->elf.non_got_ref |= eind->elf.non_got_ref; 3929 3930 edir->elf.ref_dynamic |= eind->elf.ref_dynamic; 3931 edir->elf.ref_regular |= eind->elf.ref_regular; 3932 edir->elf.ref_regular_nonweak |= eind->elf.ref_regular_nonweak; 3933 edir->elf.needs_plt |= eind->elf.needs_plt; 3934 3935 /* If we were called to copy over info for a weak sym, that's all. */ 3936 if (eind->elf.root.type != bfd_link_hash_indirect) 3937 return; 3938 3939 /* Copy over got entries that we may have already seen to the 3940 symbol which just became indirect. */ 3941 if (eind->elf.got.glist != NULL) 3942 { 3943 if (edir->elf.got.glist != NULL) 3944 { 3945 struct got_entry **entp; 3946 struct got_entry *ent; 3947 3948 for (entp = &eind->elf.got.glist; (ent = *entp) != NULL; ) 3949 { 3950 struct got_entry *dent; 3951 3952 for (dent = edir->elf.got.glist; dent != NULL; dent = dent->next) 3953 if (dent->addend == ent->addend 3954 && dent->owner == ent->owner 3955 && dent->tls_type == ent->tls_type) 3956 { 3957 dent->got.refcount += ent->got.refcount; 3958 *entp = ent->next; 3959 break; 3960 } 3961 if (dent == NULL) 3962 entp = &ent->next; 3963 } 3964 *entp = edir->elf.got.glist; 3965 } 3966 3967 edir->elf.got.glist = eind->elf.got.glist; 3968 eind->elf.got.glist = NULL; 3969 } 3970 3971 /* And plt entries. */ 3972 move_plt_plist (eind, edir); 3973 3974 if (eind->elf.dynindx != -1) 3975 { 3976 if (edir->elf.dynindx != -1) 3977 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, 3978 edir->elf.dynstr_index); 3979 edir->elf.dynindx = eind->elf.dynindx; 3980 edir->elf.dynstr_index = eind->elf.dynstr_index; 3981 eind->elf.dynindx = -1; 3982 eind->elf.dynstr_index = 0; 3983 } 3984} 3985 3986/* Find the function descriptor hash entry from the given function code 3987 hash entry FH. Link the entries via their OH fields. */ 3988 3989static struct ppc_link_hash_entry * 3990get_fdh (struct ppc_link_hash_entry *fh, struct ppc_link_hash_table *htab) 3991{ 3992 struct ppc_link_hash_entry *fdh = fh->oh; 3993 3994 if (fdh == NULL) 3995 { 3996 const char *fd_name = fh->elf.root.root.string + 1; 3997 3998 fdh = (struct ppc_link_hash_entry *) 3999 elf_link_hash_lookup (&htab->elf, fd_name, FALSE, FALSE, FALSE); 4000 if (fdh != NULL) 4001 { 4002 fdh->is_func_descriptor = 1; 4003 fdh->oh = fh; 4004 fh->is_func = 1; 4005 fh->oh = fdh; 4006 } 4007 } 4008 4009 return fdh; 4010} 4011 4012/* Make a fake function descriptor sym for the code sym FH. */ 4013 4014static struct ppc_link_hash_entry * 4015make_fdh (struct bfd_link_info *info, 4016 struct ppc_link_hash_entry *fh) 4017{ 4018 bfd *abfd; 4019 asymbol *newsym; 4020 struct bfd_link_hash_entry *bh; 4021 struct ppc_link_hash_entry *fdh; 4022 4023 abfd = fh->elf.root.u.undef.abfd; 4024 newsym = bfd_make_empty_symbol (abfd); 4025 newsym->name = fh->elf.root.root.string + 1; 4026 newsym->section = bfd_und_section_ptr; 4027 newsym->value = 0; 4028 newsym->flags = BSF_WEAK; 4029 4030 bh = NULL; 4031 if (!_bfd_generic_link_add_one_symbol (info, abfd, newsym->name, 4032 newsym->flags, newsym->section, 4033 newsym->value, NULL, FALSE, FALSE, 4034 &bh)) 4035 return NULL; 4036 4037 fdh = (struct ppc_link_hash_entry *) bh; 4038 fdh->elf.non_elf = 0; 4039 fdh->fake = 1; 4040 fdh->is_func_descriptor = 1; 4041 fdh->oh = fh; 4042 fh->is_func = 1; 4043 fh->oh = fdh; 4044 return fdh; 4045} 4046 4047/* Hacks to support old ABI code. 4048 When making function calls, old ABI code references function entry 4049 points (dot symbols), while new ABI code references the function 4050 descriptor symbol. We need to make any combination of reference and 4051 definition work together, without breaking archive linking. 4052 4053 For a defined function "foo" and an undefined call to "bar": 4054 An old object defines "foo" and ".foo", references ".bar" (possibly 4055 "bar" too). 4056 A new object defines "foo" and references "bar". 4057 4058 A new object thus has no problem with its undefined symbols being 4059 satisfied by definitions in an old object. On the other hand, the 4060 old object won't have ".bar" satisfied by a new object. */ 4061 4062/* Fix function descriptor symbols defined in .opd sections to be 4063 function type. */ 4064 4065static bfd_boolean 4066ppc64_elf_add_symbol_hook (bfd *ibfd, 4067 struct bfd_link_info *info ATTRIBUTE_UNUSED, 4068 Elf_Internal_Sym *isym, 4069 const char **name, 4070 flagword *flags ATTRIBUTE_UNUSED, 4071 asection **sec, 4072 bfd_vma *value ATTRIBUTE_UNUSED) 4073{ 4074 if (*sec != NULL 4075 && strcmp (bfd_get_section_name (ibfd, *sec), ".opd") == 0) 4076 isym->st_info = ELF_ST_INFO (ELF_ST_BIND (isym->st_info), STT_FUNC); 4077 4078 if ((*name)[0] == '.' 4079 && ELF_ST_BIND (isym->st_info) == STB_GLOBAL 4080 && ELF_ST_TYPE (isym->st_info) < STT_SECTION 4081 && is_ppc64_elf_target (ibfd->xvec)) 4082 ppc64_elf_tdata (ibfd)->u.has_dotsym = 1; 4083 4084 return TRUE; 4085} 4086 4087/* This function makes an old ABI object reference to ".bar" cause the 4088 inclusion of a new ABI object archive that defines "bar". 4089 NAME is a symbol defined in an archive. Return a symbol in the hash 4090 table that might be satisfied by the archive symbols. */ 4091 4092static struct elf_link_hash_entry * 4093ppc64_elf_archive_symbol_lookup (bfd *abfd, 4094 struct bfd_link_info *info, 4095 const char *name) 4096{ 4097 struct elf_link_hash_entry *h; 4098 char *dot_name; 4099 size_t len; 4100 4101 h = _bfd_elf_archive_symbol_lookup (abfd, info, name); 4102 if (h != NULL 4103 /* Don't return this sym if it is a fake function descriptor 4104 created by add_symbol_adjust. */ 4105 && !(h->root.type == bfd_link_hash_undefweak 4106 && ((struct ppc_link_hash_entry *) h)->fake)) 4107 return h; 4108 4109 if (name[0] == '.') 4110 return h; 4111 4112 len = strlen (name); 4113 dot_name = bfd_alloc (abfd, len + 2); 4114 if (dot_name == NULL) 4115 return (struct elf_link_hash_entry *) 0 - 1; 4116 dot_name[0] = '.'; 4117 memcpy (dot_name + 1, name, len + 1); 4118 h = _bfd_elf_archive_symbol_lookup (abfd, info, dot_name); 4119 bfd_release (abfd, dot_name); 4120 return h; 4121} 4122 4123/* This function satisfies all old ABI object references to ".bar" if a 4124 new ABI object defines "bar". Well, at least, undefined dot symbols 4125 are made weak. This stops later archive searches from including an 4126 object if we already have a function descriptor definition. It also 4127 prevents the linker complaining about undefined symbols. 4128 We also check and correct mismatched symbol visibility here. The 4129 most restrictive visibility of the function descriptor and the 4130 function entry symbol is used. */ 4131 4132struct add_symbol_adjust_data 4133{ 4134 struct bfd_link_info *info; 4135 bfd_boolean ok; 4136}; 4137 4138static bfd_boolean 4139add_symbol_adjust (struct elf_link_hash_entry *h, void *inf) 4140{ 4141 struct add_symbol_adjust_data *data; 4142 struct ppc_link_hash_table *htab; 4143 struct ppc_link_hash_entry *eh; 4144 struct ppc_link_hash_entry *fdh; 4145 4146 if (h->root.type == bfd_link_hash_indirect) 4147 return TRUE; 4148 4149 if (h->root.type == bfd_link_hash_warning) 4150 h = (struct elf_link_hash_entry *) h->root.u.i.link; 4151 4152 if (h->root.root.string[0] != '.') 4153 return TRUE; 4154 4155 data = inf; 4156 htab = ppc_hash_table (data->info); 4157 eh = (struct ppc_link_hash_entry *) h; 4158 fdh = get_fdh (eh, htab); 4159 if (fdh == NULL 4160 && !data->info->relocatable 4161 && (eh->elf.root.type == bfd_link_hash_undefined 4162 || eh->elf.root.type == bfd_link_hash_undefweak) 4163 && eh->elf.ref_regular) 4164 { 4165 /* Make an undefweak function descriptor sym, which is enough to 4166 pull in an --as-needed shared lib, but won't cause link 4167 errors. Archives are handled elsewhere. */ 4168 fdh = make_fdh (data->info, eh); 4169 if (fdh == NULL) 4170 data->ok = FALSE; 4171 else 4172 fdh->elf.ref_regular = 1; 4173 } 4174 else if (fdh != NULL) 4175 { 4176 unsigned entry_vis = ELF_ST_VISIBILITY (eh->elf.other) - 1; 4177 unsigned descr_vis = ELF_ST_VISIBILITY (fdh->elf.other) - 1; 4178 if (entry_vis < descr_vis) 4179 fdh->elf.other += entry_vis - descr_vis; 4180 else if (entry_vis > descr_vis) 4181 eh->elf.other += descr_vis - entry_vis; 4182 4183 if ((fdh->elf.root.type == bfd_link_hash_defined 4184 || fdh->elf.root.type == bfd_link_hash_defweak) 4185 && eh->elf.root.type == bfd_link_hash_undefined) 4186 { 4187 eh->elf.root.type = bfd_link_hash_undefweak; 4188 eh->was_undefined = 1; 4189 htab->twiddled_syms = 1; 4190 } 4191 } 4192 4193 return TRUE; 4194} 4195 4196static bfd_boolean 4197ppc64_elf_check_directives (bfd *abfd, struct bfd_link_info *info) 4198{ 4199 struct ppc_link_hash_table *htab; 4200 struct add_symbol_adjust_data data; 4201 4202 if (!is_ppc64_elf_target (abfd->xvec)) 4203 return TRUE; 4204 4205 if (!ppc64_elf_tdata (abfd)->u.has_dotsym) 4206 return TRUE; 4207 ppc64_elf_tdata (abfd)->u.deleted_section = NULL; 4208 4209 htab = ppc_hash_table (info); 4210 if (!is_ppc64_elf_target (htab->elf.root.creator)) 4211 return TRUE; 4212 4213 data.info = info; 4214 data.ok = TRUE; 4215 elf_link_hash_traverse (&htab->elf, add_symbol_adjust, &data); 4216 4217 /* We need to fix the undefs list for any syms we have twiddled to 4218 undef_weak. */ 4219 if (htab->twiddled_syms) 4220 { 4221 bfd_link_repair_undef_list (&htab->elf.root); 4222 htab->twiddled_syms = 0; 4223 } 4224 return data.ok; 4225} 4226 4227static bfd_boolean 4228update_local_sym_info (bfd *abfd, Elf_Internal_Shdr *symtab_hdr, 4229 unsigned long r_symndx, bfd_vma r_addend, int tls_type) 4230{ 4231 struct got_entry **local_got_ents = elf_local_got_ents (abfd); 4232 char *local_got_tls_masks; 4233 4234 if (local_got_ents == NULL) 4235 { 4236 bfd_size_type size = symtab_hdr->sh_info; 4237 4238 size *= sizeof (*local_got_ents) + sizeof (*local_got_tls_masks); 4239 local_got_ents = bfd_zalloc (abfd, size); 4240 if (local_got_ents == NULL) 4241 return FALSE; 4242 elf_local_got_ents (abfd) = local_got_ents; 4243 } 4244 4245 if ((tls_type & TLS_EXPLICIT) == 0) 4246 { 4247 struct got_entry *ent; 4248 4249 for (ent = local_got_ents[r_symndx]; ent != NULL; ent = ent->next) 4250 if (ent->addend == r_addend 4251 && ent->owner == abfd 4252 && ent->tls_type == tls_type) 4253 break; 4254 if (ent == NULL) 4255 { 4256 bfd_size_type amt = sizeof (*ent); 4257 ent = bfd_alloc (abfd, amt); 4258 if (ent == NULL) 4259 return FALSE; 4260 ent->next = local_got_ents[r_symndx]; 4261 ent->addend = r_addend; 4262 ent->owner = abfd; 4263 ent->tls_type = tls_type; 4264 ent->got.refcount = 0; 4265 local_got_ents[r_symndx] = ent; 4266 } 4267 ent->got.refcount += 1; 4268 } 4269 4270 local_got_tls_masks = (char *) (local_got_ents + symtab_hdr->sh_info); 4271 local_got_tls_masks[r_symndx] |= tls_type; 4272 return TRUE; 4273} 4274 4275static bfd_boolean 4276update_plt_info (bfd *abfd, struct ppc_link_hash_entry *eh, bfd_vma addend) 4277{ 4278 struct plt_entry *ent; 4279 4280 for (ent = eh->elf.plt.plist; ent != NULL; ent = ent->next) 4281 if (ent->addend == addend) 4282 break; 4283 if (ent == NULL) 4284 { 4285 bfd_size_type amt = sizeof (*ent); 4286 ent = bfd_alloc (abfd, amt); 4287 if (ent == NULL) 4288 return FALSE; 4289 ent->next = eh->elf.plt.plist; 4290 ent->addend = addend; 4291 ent->plt.refcount = 0; 4292 eh->elf.plt.plist = ent; 4293 } 4294 ent->plt.refcount += 1; 4295 eh->elf.needs_plt = 1; 4296 if (eh->elf.root.root.string[0] == '.' 4297 && eh->elf.root.root.string[1] != '\0') 4298 eh->is_func = 1; 4299 return TRUE; 4300} 4301 4302/* Look through the relocs for a section during the first phase, and 4303 calculate needed space in the global offset table, procedure 4304 linkage table, and dynamic reloc sections. */ 4305 4306static bfd_boolean 4307ppc64_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, 4308 asection *sec, const Elf_Internal_Rela *relocs) 4309{ 4310 struct ppc_link_hash_table *htab; 4311 Elf_Internal_Shdr *symtab_hdr; 4312 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; 4313 const Elf_Internal_Rela *rel; 4314 const Elf_Internal_Rela *rel_end; 4315 asection *sreloc; 4316 asection **opd_sym_map; 4317 4318 if (info->relocatable) 4319 return TRUE; 4320 4321 /* Don't do anything special with non-loaded, non-alloced sections. 4322 In particular, any relocs in such sections should not affect GOT 4323 and PLT reference counting (ie. we don't allow them to create GOT 4324 or PLT entries), there's no possibility or desire to optimize TLS 4325 relocs, and there's not much point in propagating relocs to shared 4326 libs that the dynamic linker won't relocate. */ 4327 if ((sec->flags & SEC_ALLOC) == 0) 4328 return TRUE; 4329 4330 htab = ppc_hash_table (info); 4331 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 4332 4333 sym_hashes = elf_sym_hashes (abfd); 4334 sym_hashes_end = (sym_hashes 4335 + symtab_hdr->sh_size / sizeof (Elf64_External_Sym) 4336 - symtab_hdr->sh_info); 4337 4338 sreloc = NULL; 4339 opd_sym_map = NULL; 4340 if (strcmp (bfd_get_section_name (abfd, sec), ".opd") == 0) 4341 { 4342 /* Garbage collection needs some extra help with .opd sections. 4343 We don't want to necessarily keep everything referenced by 4344 relocs in .opd, as that would keep all functions. Instead, 4345 if we reference an .opd symbol (a function descriptor), we 4346 want to keep the function code symbol's section. This is 4347 easy for global symbols, but for local syms we need to keep 4348 information about the associated function section. Later, if 4349 edit_opd deletes entries, we'll use this array to adjust 4350 local syms in .opd. */ 4351 union opd_info { 4352 asection *func_section; 4353 long entry_adjust; 4354 }; 4355 bfd_size_type amt; 4356 4357 amt = sec->size * sizeof (union opd_info) / 8; 4358 opd_sym_map = bfd_zalloc (abfd, amt); 4359 if (opd_sym_map == NULL) 4360 return FALSE; 4361 ppc64_elf_section_data (sec)->opd.func_sec = opd_sym_map; 4362 } 4363 4364 if (htab->sfpr == NULL 4365 && !create_linkage_sections (htab->elf.dynobj, info)) 4366 return FALSE; 4367 4368 rel_end = relocs + sec->reloc_count; 4369 for (rel = relocs; rel < rel_end; rel++) 4370 { 4371 unsigned long r_symndx; 4372 struct elf_link_hash_entry *h; 4373 enum elf_ppc64_reloc_type r_type; 4374 int tls_type = 0; 4375 4376 r_symndx = ELF64_R_SYM (rel->r_info); 4377 if (r_symndx < symtab_hdr->sh_info) 4378 h = NULL; 4379 else 4380 { 4381 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 4382 while (h->root.type == bfd_link_hash_indirect 4383 || h->root.type == bfd_link_hash_warning) 4384 h = (struct elf_link_hash_entry *) h->root.u.i.link; 4385 } 4386 4387 r_type = ELF64_R_TYPE (rel->r_info); 4388 switch (r_type) 4389 { 4390 case R_PPC64_GOT_TLSLD16: 4391 case R_PPC64_GOT_TLSLD16_LO: 4392 case R_PPC64_GOT_TLSLD16_HI: 4393 case R_PPC64_GOT_TLSLD16_HA: 4394 ppc64_tlsld_got (abfd)->refcount += 1; 4395 tls_type = TLS_TLS | TLS_LD; 4396 goto dogottls; 4397 4398 case R_PPC64_GOT_TLSGD16: 4399 case R_PPC64_GOT_TLSGD16_LO: 4400 case R_PPC64_GOT_TLSGD16_HI: 4401 case R_PPC64_GOT_TLSGD16_HA: 4402 tls_type = TLS_TLS | TLS_GD; 4403 goto dogottls; 4404 4405 case R_PPC64_GOT_TPREL16_DS: 4406 case R_PPC64_GOT_TPREL16_LO_DS: 4407 case R_PPC64_GOT_TPREL16_HI: 4408 case R_PPC64_GOT_TPREL16_HA: 4409 if (info->shared) 4410 info->flags |= DF_STATIC_TLS; 4411 tls_type = TLS_TLS | TLS_TPREL; 4412 goto dogottls; 4413 4414 case R_PPC64_GOT_DTPREL16_DS: 4415 case R_PPC64_GOT_DTPREL16_LO_DS: 4416 case R_PPC64_GOT_DTPREL16_HI: 4417 case R_PPC64_GOT_DTPREL16_HA: 4418 tls_type = TLS_TLS | TLS_DTPREL; 4419 dogottls: 4420 sec->has_tls_reloc = 1; 4421 /* Fall thru */ 4422 4423 case R_PPC64_GOT16: 4424 case R_PPC64_GOT16_DS: 4425 case R_PPC64_GOT16_HA: 4426 case R_PPC64_GOT16_HI: 4427 case R_PPC64_GOT16_LO: 4428 case R_PPC64_GOT16_LO_DS: 4429 /* This symbol requires a global offset table entry. */ 4430 sec->has_toc_reloc = 1; 4431 if (ppc64_elf_tdata (abfd)->got == NULL 4432 && !create_got_section (abfd, info)) 4433 return FALSE; 4434 4435 if (h != NULL) 4436 { 4437 struct ppc_link_hash_entry *eh; 4438 struct got_entry *ent; 4439 4440 eh = (struct ppc_link_hash_entry *) h; 4441 for (ent = eh->elf.got.glist; ent != NULL; ent = ent->next) 4442 if (ent->addend == rel->r_addend 4443 && ent->owner == abfd 4444 && ent->tls_type == tls_type) 4445 break; 4446 if (ent == NULL) 4447 { 4448 bfd_size_type amt = sizeof (*ent); 4449 ent = bfd_alloc (abfd, amt); 4450 if (ent == NULL) 4451 return FALSE; 4452 ent->next = eh->elf.got.glist; 4453 ent->addend = rel->r_addend; 4454 ent->owner = abfd; 4455 ent->tls_type = tls_type; 4456 ent->got.refcount = 0; 4457 eh->elf.got.glist = ent; 4458 } 4459 ent->got.refcount += 1; 4460 eh->tls_mask |= tls_type; 4461 } 4462 else 4463 /* This is a global offset table entry for a local symbol. */ 4464 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx, 4465 rel->r_addend, tls_type)) 4466 return FALSE; 4467 break; 4468 4469 case R_PPC64_PLT16_HA: 4470 case R_PPC64_PLT16_HI: 4471 case R_PPC64_PLT16_LO: 4472 case R_PPC64_PLT32: 4473 case R_PPC64_PLT64: 4474 /* This symbol requires a procedure linkage table entry. We 4475 actually build the entry in adjust_dynamic_symbol, 4476 because this might be a case of linking PIC code without 4477 linking in any dynamic objects, in which case we don't 4478 need to generate a procedure linkage table after all. */ 4479 if (h == NULL) 4480 { 4481 /* It does not make sense to have a procedure linkage 4482 table entry for a local symbol. */ 4483 bfd_set_error (bfd_error_bad_value); 4484 return FALSE; 4485 } 4486 else 4487 if (!update_plt_info (abfd, (struct ppc_link_hash_entry *) h, 4488 rel->r_addend)) 4489 return FALSE; 4490 break; 4491 4492 /* The following relocations don't need to propagate the 4493 relocation if linking a shared object since they are 4494 section relative. */ 4495 case R_PPC64_SECTOFF: 4496 case R_PPC64_SECTOFF_LO: 4497 case R_PPC64_SECTOFF_HI: 4498 case R_PPC64_SECTOFF_HA: 4499 case R_PPC64_SECTOFF_DS: 4500 case R_PPC64_SECTOFF_LO_DS: 4501 case R_PPC64_DTPREL16: 4502 case R_PPC64_DTPREL16_LO: 4503 case R_PPC64_DTPREL16_HI: 4504 case R_PPC64_DTPREL16_HA: 4505 case R_PPC64_DTPREL16_DS: 4506 case R_PPC64_DTPREL16_LO_DS: 4507 case R_PPC64_DTPREL16_HIGHER: 4508 case R_PPC64_DTPREL16_HIGHERA: 4509 case R_PPC64_DTPREL16_HIGHEST: 4510 case R_PPC64_DTPREL16_HIGHESTA: 4511 break; 4512 4513 /* Nor do these. */ 4514 case R_PPC64_TOC16: 4515 case R_PPC64_TOC16_LO: 4516 case R_PPC64_TOC16_HI: 4517 case R_PPC64_TOC16_HA: 4518 case R_PPC64_TOC16_DS: 4519 case R_PPC64_TOC16_LO_DS: 4520 sec->has_toc_reloc = 1; 4521 break; 4522 4523 /* This relocation describes the C++ object vtable hierarchy. 4524 Reconstruct it for later use during GC. */ 4525 case R_PPC64_GNU_VTINHERIT: 4526 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) 4527 return FALSE; 4528 break; 4529 4530 /* This relocation describes which C++ vtable entries are actually 4531 used. Record for later use during GC. */ 4532 case R_PPC64_GNU_VTENTRY: 4533 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) 4534 return FALSE; 4535 break; 4536 4537 case R_PPC64_REL14: 4538 case R_PPC64_REL14_BRTAKEN: 4539 case R_PPC64_REL14_BRNTAKEN: 4540 { 4541 asection *dest = NULL; 4542 4543 /* Heuristic: If jumping outside our section, chances are 4544 we are going to need a stub. */ 4545 if (h != NULL) 4546 { 4547 /* If the sym is weak it may be overridden later, so 4548 don't assume we know where a weak sym lives. */ 4549 if (h->root.type == bfd_link_hash_defined) 4550 dest = h->root.u.def.section; 4551 } 4552 else 4553 dest = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 4554 sec, r_symndx); 4555 if (dest != sec) 4556 htab->has_14bit_branch = 1; 4557 } 4558 /* Fall through. */ 4559 4560 case R_PPC64_REL24: 4561 if (h != NULL) 4562 { 4563 /* We may need a .plt entry if the function this reloc 4564 refers to is in a shared lib. */ 4565 if (!update_plt_info (abfd, (struct ppc_link_hash_entry *) h, 4566 rel->r_addend)) 4567 return FALSE; 4568 if (h == &htab->tls_get_addr->elf 4569 || h == &htab->tls_get_addr_fd->elf) 4570 sec->has_tls_reloc = 1; 4571 else if (htab->tls_get_addr == NULL 4572 && !strncmp (h->root.root.string, ".__tls_get_addr", 15) 4573 && (h->root.root.string[15] == 0 4574 || h->root.root.string[15] == '@')) 4575 { 4576 htab->tls_get_addr = (struct ppc_link_hash_entry *) h; 4577 sec->has_tls_reloc = 1; 4578 } 4579 else if (htab->tls_get_addr_fd == NULL 4580 && !strncmp (h->root.root.string, "__tls_get_addr", 14) 4581 && (h->root.root.string[14] == 0 4582 || h->root.root.string[14] == '@')) 4583 { 4584 htab->tls_get_addr_fd = (struct ppc_link_hash_entry *) h; 4585 sec->has_tls_reloc = 1; 4586 } 4587 } 4588 break; 4589 4590 case R_PPC64_TPREL64: 4591 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_TPREL; 4592 if (info->shared) 4593 info->flags |= DF_STATIC_TLS; 4594 goto dotlstoc; 4595 4596 case R_PPC64_DTPMOD64: 4597 if (rel + 1 < rel_end 4598 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64) 4599 && rel[1].r_offset == rel->r_offset + 8) 4600 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_GD; 4601 else 4602 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_LD; 4603 goto dotlstoc; 4604 4605 case R_PPC64_DTPREL64: 4606 tls_type = TLS_EXPLICIT | TLS_TLS | TLS_DTPREL; 4607 if (rel != relocs 4608 && rel[-1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPMOD64) 4609 && rel[-1].r_offset == rel->r_offset - 8) 4610 /* This is the second reloc of a dtpmod, dtprel pair. 4611 Don't mark with TLS_DTPREL. */ 4612 goto dodyn; 4613 4614 dotlstoc: 4615 sec->has_tls_reloc = 1; 4616 if (h != NULL) 4617 { 4618 struct ppc_link_hash_entry *eh; 4619 eh = (struct ppc_link_hash_entry *) h; 4620 eh->tls_mask |= tls_type; 4621 } 4622 else 4623 if (!update_local_sym_info (abfd, symtab_hdr, r_symndx, 4624 rel->r_addend, tls_type)) 4625 return FALSE; 4626 4627 if (ppc64_elf_section_data (sec)->t_symndx == NULL) 4628 { 4629 /* One extra to simplify get_tls_mask. */ 4630 bfd_size_type amt = sec->size * sizeof (unsigned) / 8 + 1; 4631 ppc64_elf_section_data (sec)->t_symndx = bfd_zalloc (abfd, amt); 4632 if (ppc64_elf_section_data (sec)->t_symndx == NULL) 4633 return FALSE; 4634 } 4635 BFD_ASSERT (rel->r_offset % 8 == 0); 4636 ppc64_elf_section_data (sec)->t_symndx[rel->r_offset / 8] = r_symndx; 4637 4638 /* Mark the second slot of a GD or LD entry. 4639 -1 to indicate GD and -2 to indicate LD. */ 4640 if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_GD)) 4641 ppc64_elf_section_data (sec)->t_symndx[rel->r_offset / 8 + 1] = -1; 4642 else if (tls_type == (TLS_EXPLICIT | TLS_TLS | TLS_LD)) 4643 ppc64_elf_section_data (sec)->t_symndx[rel->r_offset / 8 + 1] = -2; 4644 goto dodyn; 4645 4646 case R_PPC64_TPREL16: 4647 case R_PPC64_TPREL16_LO: 4648 case R_PPC64_TPREL16_HI: 4649 case R_PPC64_TPREL16_HA: 4650 case R_PPC64_TPREL16_DS: 4651 case R_PPC64_TPREL16_LO_DS: 4652 case R_PPC64_TPREL16_HIGHER: 4653 case R_PPC64_TPREL16_HIGHERA: 4654 case R_PPC64_TPREL16_HIGHEST: 4655 case R_PPC64_TPREL16_HIGHESTA: 4656 if (info->shared) 4657 { 4658 info->flags |= DF_STATIC_TLS; 4659 goto dodyn; 4660 } 4661 break; 4662 4663 case R_PPC64_ADDR64: 4664 if (opd_sym_map != NULL 4665 && rel + 1 < rel_end 4666 && ELF64_R_TYPE ((rel + 1)->r_info) == R_PPC64_TOC) 4667 { 4668 if (h != NULL) 4669 { 4670 if (h->root.root.string[0] == '.' 4671 && h->root.root.string[1] != 0 4672 && get_fdh ((struct ppc_link_hash_entry *) h, htab)) 4673 ; 4674 else 4675 ((struct ppc_link_hash_entry *) h)->is_func = 1; 4676 } 4677 else 4678 { 4679 asection *s; 4680 4681 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, sec, 4682 r_symndx); 4683 if (s == NULL) 4684 return FALSE; 4685 else if (s != sec) 4686 opd_sym_map[rel->r_offset / 8] = s; 4687 } 4688 } 4689 /* Fall through. */ 4690 4691 case R_PPC64_REL30: 4692 case R_PPC64_REL32: 4693 case R_PPC64_REL64: 4694 case R_PPC64_ADDR14: 4695 case R_PPC64_ADDR14_BRNTAKEN: 4696 case R_PPC64_ADDR14_BRTAKEN: 4697 case R_PPC64_ADDR16: 4698 case R_PPC64_ADDR16_DS: 4699 case R_PPC64_ADDR16_HA: 4700 case R_PPC64_ADDR16_HI: 4701 case R_PPC64_ADDR16_HIGHER: 4702 case R_PPC64_ADDR16_HIGHERA: 4703 case R_PPC64_ADDR16_HIGHEST: 4704 case R_PPC64_ADDR16_HIGHESTA: 4705 case R_PPC64_ADDR16_LO: 4706 case R_PPC64_ADDR16_LO_DS: 4707 case R_PPC64_ADDR24: 4708 case R_PPC64_ADDR32: 4709 case R_PPC64_UADDR16: 4710 case R_PPC64_UADDR32: 4711 case R_PPC64_UADDR64: 4712 case R_PPC64_TOC: 4713 if (h != NULL && !info->shared) 4714 /* We may need a copy reloc. */ 4715 h->non_got_ref = 1; 4716 4717 /* Don't propagate .opd relocs. */ 4718 if (NO_OPD_RELOCS && opd_sym_map != NULL) 4719 break; 4720 4721 /* If we are creating a shared library, and this is a reloc 4722 against a global symbol, or a non PC relative reloc 4723 against a local symbol, then we need to copy the reloc 4724 into the shared library. However, if we are linking with 4725 -Bsymbolic, we do not need to copy a reloc against a 4726 global symbol which is defined in an object we are 4727 including in the link (i.e., DEF_REGULAR is set). At 4728 this point we have not seen all the input files, so it is 4729 possible that DEF_REGULAR is not set now but will be set 4730 later (it is never cleared). In case of a weak definition, 4731 DEF_REGULAR may be cleared later by a strong definition in 4732 a shared library. We account for that possibility below by 4733 storing information in the dyn_relocs field of the hash 4734 table entry. A similar situation occurs when creating 4735 shared libraries and symbol visibility changes render the 4736 symbol local. 4737 4738 If on the other hand, we are creating an executable, we 4739 may need to keep relocations for symbols satisfied by a 4740 dynamic library if we manage to avoid copy relocs for the 4741 symbol. */ 4742 dodyn: 4743 if ((info->shared 4744 && (MUST_BE_DYN_RELOC (r_type) 4745 || (h != NULL 4746 && (! info->symbolic 4747 || h->root.type == bfd_link_hash_defweak 4748 || !h->def_regular)))) 4749 || (ELIMINATE_COPY_RELOCS 4750 && !info->shared 4751 && h != NULL 4752 && (h->root.type == bfd_link_hash_defweak 4753 || !h->def_regular))) 4754 { 4755 struct ppc_dyn_relocs *p; 4756 struct ppc_dyn_relocs **head; 4757 4758 /* We must copy these reloc types into the output file. 4759 Create a reloc section in dynobj and make room for 4760 this reloc. */ 4761 if (sreloc == NULL) 4762 { 4763 const char *name; 4764 bfd *dynobj; 4765 4766 name = (bfd_elf_string_from_elf_section 4767 (abfd, 4768 elf_elfheader (abfd)->e_shstrndx, 4769 elf_section_data (sec)->rel_hdr.sh_name)); 4770 if (name == NULL) 4771 return FALSE; 4772 4773 if (strncmp (name, ".rela", 5) != 0 4774 || strcmp (bfd_get_section_name (abfd, sec), 4775 name + 5) != 0) 4776 { 4777 (*_bfd_error_handler) 4778 (_("%B: bad relocation section name `%s\'"), 4779 abfd, name); 4780 bfd_set_error (bfd_error_bad_value); 4781 } 4782 4783 dynobj = htab->elf.dynobj; 4784 sreloc = bfd_get_section_by_name (dynobj, name); 4785 if (sreloc == NULL) 4786 { 4787 flagword flags; 4788 4789 flags = (SEC_HAS_CONTENTS | SEC_READONLY 4790 | SEC_IN_MEMORY | SEC_LINKER_CREATED 4791 | SEC_ALLOC | SEC_LOAD); 4792 sreloc = bfd_make_section_with_flags (dynobj, 4793 name, 4794 flags); 4795 if (sreloc == NULL 4796 || ! bfd_set_section_alignment (dynobj, sreloc, 3)) 4797 return FALSE; 4798 } 4799 elf_section_data (sec)->sreloc = sreloc; 4800 } 4801 4802 /* If this is a global symbol, we count the number of 4803 relocations we need for this symbol. */ 4804 if (h != NULL) 4805 { 4806 head = &((struct ppc_link_hash_entry *) h)->dyn_relocs; 4807 } 4808 else 4809 { 4810 /* Track dynamic relocs needed for local syms too. 4811 We really need local syms available to do this 4812 easily. Oh well. */ 4813 4814 asection *s; 4815 void *vpp; 4816 4817 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, 4818 sec, r_symndx); 4819 if (s == NULL) 4820 return FALSE; 4821 4822 vpp = &elf_section_data (s)->local_dynrel; 4823 head = (struct ppc_dyn_relocs **) vpp; 4824 } 4825 4826 p = *head; 4827 if (p == NULL || p->sec != sec) 4828 { 4829 p = bfd_alloc (htab->elf.dynobj, sizeof *p); 4830 if (p == NULL) 4831 return FALSE; 4832 p->next = *head; 4833 *head = p; 4834 p->sec = sec; 4835 p->count = 0; 4836 p->pc_count = 0; 4837 } 4838 4839 p->count += 1; 4840 if (!MUST_BE_DYN_RELOC (r_type)) 4841 p->pc_count += 1; 4842 } 4843 break; 4844 4845 default: 4846 break; 4847 } 4848 } 4849 4850 return TRUE; 4851} 4852 4853/* OFFSET in OPD_SEC specifies a function descriptor. Return the address 4854 of the code entry point, and its section. */ 4855 4856static bfd_vma 4857opd_entry_value (asection *opd_sec, 4858 bfd_vma offset, 4859 asection **code_sec, 4860 bfd_vma *code_off) 4861{ 4862 bfd *opd_bfd = opd_sec->owner; 4863 Elf_Internal_Rela *relocs; 4864 Elf_Internal_Rela *lo, *hi, *look; 4865 bfd_vma val; 4866 4867 /* No relocs implies we are linking a --just-symbols object. */ 4868 if (opd_sec->reloc_count == 0) 4869 { 4870 bfd_vma val; 4871 4872 if (!bfd_get_section_contents (opd_bfd, opd_sec, &val, offset, 8)) 4873 return (bfd_vma) -1; 4874 4875 if (code_sec != NULL) 4876 { 4877 asection *sec, *likely = NULL; 4878 for (sec = opd_bfd->sections; sec != NULL; sec = sec->next) 4879 if (sec->vma <= val 4880 && (sec->flags & SEC_LOAD) != 0 4881 && (sec->flags & SEC_ALLOC) != 0) 4882 likely = sec; 4883 if (likely != NULL) 4884 { 4885 *code_sec = likely; 4886 if (code_off != NULL) 4887 *code_off = val - likely->vma; 4888 } 4889 } 4890 return val; 4891 } 4892 4893 relocs = ppc64_elf_tdata (opd_bfd)->opd_relocs; 4894 if (relocs == NULL) 4895 relocs = _bfd_elf_link_read_relocs (opd_bfd, opd_sec, NULL, NULL, TRUE); 4896 4897 /* Go find the opd reloc at the sym address. */ 4898 lo = relocs; 4899 BFD_ASSERT (lo != NULL); 4900 hi = lo + opd_sec->reloc_count - 1; /* ignore last reloc */ 4901 val = (bfd_vma) -1; 4902 while (lo < hi) 4903 { 4904 look = lo + (hi - lo) / 2; 4905 if (look->r_offset < offset) 4906 lo = look + 1; 4907 else if (look->r_offset > offset) 4908 hi = look; 4909 else 4910 { 4911 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (opd_bfd)->symtab_hdr; 4912 if (ELF64_R_TYPE (look->r_info) == R_PPC64_ADDR64 4913 && ELF64_R_TYPE ((look + 1)->r_info) == R_PPC64_TOC) 4914 { 4915 unsigned long symndx = ELF64_R_SYM (look->r_info); 4916 asection *sec; 4917 4918 if (symndx < symtab_hdr->sh_info) 4919 { 4920 Elf_Internal_Sym *sym; 4921 4922 sym = (Elf_Internal_Sym *) symtab_hdr->contents; 4923 if (sym == NULL) 4924 { 4925 sym = bfd_elf_get_elf_syms (opd_bfd, symtab_hdr, 4926 symtab_hdr->sh_info, 4927 0, NULL, NULL, NULL); 4928 if (sym == NULL) 4929 break; 4930 symtab_hdr->contents = (bfd_byte *) sym; 4931 } 4932 4933 sym += symndx; 4934 val = sym->st_value; 4935 sec = NULL; 4936 if ((sym->st_shndx != SHN_UNDEF 4937 && sym->st_shndx < SHN_LORESERVE) 4938 || sym->st_shndx > SHN_HIRESERVE) 4939 sec = bfd_section_from_elf_index (opd_bfd, sym->st_shndx); 4940 BFD_ASSERT ((sec->flags & SEC_MERGE) == 0); 4941 } 4942 else 4943 { 4944 struct elf_link_hash_entry **sym_hashes; 4945 struct elf_link_hash_entry *rh; 4946 4947 sym_hashes = elf_sym_hashes (opd_bfd); 4948 rh = sym_hashes[symndx - symtab_hdr->sh_info]; 4949 while (rh->root.type == bfd_link_hash_indirect 4950 || rh->root.type == bfd_link_hash_warning) 4951 rh = ((struct elf_link_hash_entry *) rh->root.u.i.link); 4952 BFD_ASSERT (rh->root.type == bfd_link_hash_defined 4953 || rh->root.type == bfd_link_hash_defweak); 4954 val = rh->root.u.def.value; 4955 sec = rh->root.u.def.section; 4956 } 4957 val += look->r_addend; 4958 if (code_off != NULL) 4959 *code_off = val; 4960 if (code_sec != NULL) 4961 *code_sec = sec; 4962 if (sec != NULL && sec->output_section != NULL) 4963 val += sec->output_section->vma + sec->output_offset; 4964 } 4965 break; 4966 } 4967 } 4968 4969 return val; 4970} 4971 4972/* Mark sections containing dynamically referenced symbols. When 4973 building shared libraries, we must assume that any visible symbol is 4974 referenced. */ 4975 4976static bfd_boolean 4977ppc64_elf_gc_mark_dynamic_ref (struct elf_link_hash_entry *h, void *inf) 4978{ 4979 struct bfd_link_info *info = (struct bfd_link_info *) inf; 4980 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) h; 4981 4982 if (eh->elf.root.type == bfd_link_hash_warning) 4983 eh = (struct ppc_link_hash_entry *) eh->elf.root.u.i.link; 4984 4985 /* Dynamic linking info is on the func descriptor sym. */ 4986 if (eh->oh != NULL 4987 && eh->oh->is_func_descriptor 4988 && (eh->oh->elf.root.type == bfd_link_hash_defined 4989 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 4990 eh = eh->oh; 4991 4992 if ((eh->elf.root.type == bfd_link_hash_defined 4993 || eh->elf.root.type == bfd_link_hash_defweak) 4994 && (eh->elf.ref_dynamic 4995 || (!info->executable 4996 && eh->elf.def_regular 4997 && ELF_ST_VISIBILITY (eh->elf.other) != STV_INTERNAL 4998 && ELF_ST_VISIBILITY (eh->elf.other) != STV_HIDDEN))) 4999 { 5000 asection *code_sec; 5001 5002 eh->elf.root.u.def.section->flags |= SEC_KEEP; 5003 5004 /* Function descriptor syms cause the associated 5005 function code sym section to be marked. */ 5006 if (eh->is_func_descriptor 5007 && (eh->oh->elf.root.type == bfd_link_hash_defined 5008 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5009 eh->oh->elf.root.u.def.section->flags |= SEC_KEEP; 5010 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5011 && opd_entry_value (eh->elf.root.u.def.section, 5012 eh->elf.root.u.def.value, 5013 &code_sec, NULL) != (bfd_vma) -1) 5014 code_sec->flags |= SEC_KEEP; 5015 } 5016 5017 return TRUE; 5018} 5019 5020/* Return the section that should be marked against GC for a given 5021 relocation. */ 5022 5023static asection * 5024ppc64_elf_gc_mark_hook (asection *sec, 5025 struct bfd_link_info *info, 5026 Elf_Internal_Rela *rel, 5027 struct elf_link_hash_entry *h, 5028 Elf_Internal_Sym *sym) 5029{ 5030 asection *rsec; 5031 5032 /* First mark all our entry sym sections. */ 5033 if (info->gc_sym_list != NULL) 5034 { 5035 struct ppc_link_hash_table *htab = ppc_hash_table (info); 5036 struct bfd_sym_chain *sym = info->gc_sym_list; 5037 5038 info->gc_sym_list = NULL; 5039 for (; sym != NULL; sym = sym->next) 5040 { 5041 struct ppc_link_hash_entry *eh; 5042 5043 eh = (struct ppc_link_hash_entry *) 5044 elf_link_hash_lookup (&htab->elf, sym->name, FALSE, FALSE, FALSE); 5045 if (eh == NULL) 5046 continue; 5047 if (eh->elf.root.type != bfd_link_hash_defined 5048 && eh->elf.root.type != bfd_link_hash_defweak) 5049 continue; 5050 5051 if (eh->is_func_descriptor 5052 && (eh->oh->elf.root.type == bfd_link_hash_defined 5053 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5054 rsec = eh->oh->elf.root.u.def.section; 5055 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5056 && opd_entry_value (eh->elf.root.u.def.section, 5057 eh->elf.root.u.def.value, 5058 &rsec, NULL) != (bfd_vma) -1) 5059 ; 5060 else 5061 continue; 5062 5063 if (!rsec->gc_mark) 5064 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook); 5065 5066 rsec = eh->elf.root.u.def.section; 5067 if (!rsec->gc_mark) 5068 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook); 5069 } 5070 } 5071 5072 /* Syms return NULL if we're marking .opd, so we avoid marking all 5073 function sections, as all functions are referenced in .opd. */ 5074 rsec = NULL; 5075 if (get_opd_info (sec) != NULL) 5076 return rsec; 5077 5078 if (h != NULL) 5079 { 5080 enum elf_ppc64_reloc_type r_type; 5081 struct ppc_link_hash_entry *eh; 5082 5083 r_type = ELF64_R_TYPE (rel->r_info); 5084 switch (r_type) 5085 { 5086 case R_PPC64_GNU_VTINHERIT: 5087 case R_PPC64_GNU_VTENTRY: 5088 break; 5089 5090 default: 5091 switch (h->root.type) 5092 { 5093 case bfd_link_hash_defined: 5094 case bfd_link_hash_defweak: 5095 eh = (struct ppc_link_hash_entry *) h; 5096 if (eh->oh != NULL 5097 && eh->oh->is_func_descriptor 5098 && (eh->oh->elf.root.type == bfd_link_hash_defined 5099 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5100 eh = eh->oh; 5101 5102 /* Function descriptor syms cause the associated 5103 function code sym section to be marked. */ 5104 if (eh->is_func_descriptor 5105 && (eh->oh->elf.root.type == bfd_link_hash_defined 5106 || eh->oh->elf.root.type == bfd_link_hash_defweak)) 5107 { 5108 /* They also mark their opd section. */ 5109 if (!eh->elf.root.u.def.section->gc_mark) 5110 _bfd_elf_gc_mark (info, eh->elf.root.u.def.section, 5111 ppc64_elf_gc_mark_hook); 5112 5113 rsec = eh->oh->elf.root.u.def.section; 5114 } 5115 else if (get_opd_info (eh->elf.root.u.def.section) != NULL 5116 && opd_entry_value (eh->elf.root.u.def.section, 5117 eh->elf.root.u.def.value, 5118 &rsec, NULL) != (bfd_vma) -1) 5119 { 5120 if (!eh->elf.root.u.def.section->gc_mark) 5121 _bfd_elf_gc_mark (info, eh->elf.root.u.def.section, 5122 ppc64_elf_gc_mark_hook); 5123 } 5124 else 5125 rsec = h->root.u.def.section; 5126 break; 5127 5128 case bfd_link_hash_common: 5129 rsec = h->root.u.c.p->section; 5130 break; 5131 5132 default: 5133 break; 5134 } 5135 } 5136 } 5137 else 5138 { 5139 asection **opd_sym_section; 5140 5141 rsec = bfd_section_from_elf_index (sec->owner, sym->st_shndx); 5142 opd_sym_section = get_opd_info (rsec); 5143 if (opd_sym_section != NULL) 5144 { 5145 if (!rsec->gc_mark) 5146 _bfd_elf_gc_mark (info, rsec, ppc64_elf_gc_mark_hook); 5147 5148 rsec = opd_sym_section[(sym->st_value + rel->r_addend) / 8]; 5149 } 5150 } 5151 5152 return rsec; 5153} 5154 5155/* Update the .got, .plt. and dynamic reloc reference counts for the 5156 section being removed. */ 5157 5158static bfd_boolean 5159ppc64_elf_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info, 5160 asection *sec, const Elf_Internal_Rela *relocs) 5161{ 5162 struct ppc_link_hash_table *htab; 5163 Elf_Internal_Shdr *symtab_hdr; 5164 struct elf_link_hash_entry **sym_hashes; 5165 struct got_entry **local_got_ents; 5166 const Elf_Internal_Rela *rel, *relend; 5167 5168 if ((sec->flags & SEC_ALLOC) == 0) 5169 return TRUE; 5170 5171 elf_section_data (sec)->local_dynrel = NULL; 5172 5173 htab = ppc_hash_table (info); 5174 symtab_hdr = &elf_tdata (abfd)->symtab_hdr; 5175 sym_hashes = elf_sym_hashes (abfd); 5176 local_got_ents = elf_local_got_ents (abfd); 5177 5178 relend = relocs + sec->reloc_count; 5179 for (rel = relocs; rel < relend; rel++) 5180 { 5181 unsigned long r_symndx; 5182 enum elf_ppc64_reloc_type r_type; 5183 struct elf_link_hash_entry *h = NULL; 5184 char tls_type = 0; 5185 5186 r_symndx = ELF64_R_SYM (rel->r_info); 5187 r_type = ELF64_R_TYPE (rel->r_info); 5188 if (r_symndx >= symtab_hdr->sh_info) 5189 { 5190 struct ppc_link_hash_entry *eh; 5191 struct ppc_dyn_relocs **pp; 5192 struct ppc_dyn_relocs *p; 5193 5194 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 5195 while (h->root.type == bfd_link_hash_indirect 5196 || h->root.type == bfd_link_hash_warning) 5197 h = (struct elf_link_hash_entry *) h->root.u.i.link; 5198 eh = (struct ppc_link_hash_entry *) h; 5199 5200 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) 5201 if (p->sec == sec) 5202 { 5203 /* Everything must go for SEC. */ 5204 *pp = p->next; 5205 break; 5206 } 5207 } 5208 5209 switch (r_type) 5210 { 5211 case R_PPC64_GOT_TLSLD16: 5212 case R_PPC64_GOT_TLSLD16_LO: 5213 case R_PPC64_GOT_TLSLD16_HI: 5214 case R_PPC64_GOT_TLSLD16_HA: 5215 ppc64_tlsld_got (abfd)->refcount -= 1; 5216 tls_type = TLS_TLS | TLS_LD; 5217 goto dogot; 5218 5219 case R_PPC64_GOT_TLSGD16: 5220 case R_PPC64_GOT_TLSGD16_LO: 5221 case R_PPC64_GOT_TLSGD16_HI: 5222 case R_PPC64_GOT_TLSGD16_HA: 5223 tls_type = TLS_TLS | TLS_GD; 5224 goto dogot; 5225 5226 case R_PPC64_GOT_TPREL16_DS: 5227 case R_PPC64_GOT_TPREL16_LO_DS: 5228 case R_PPC64_GOT_TPREL16_HI: 5229 case R_PPC64_GOT_TPREL16_HA: 5230 tls_type = TLS_TLS | TLS_TPREL; 5231 goto dogot; 5232 5233 case R_PPC64_GOT_DTPREL16_DS: 5234 case R_PPC64_GOT_DTPREL16_LO_DS: 5235 case R_PPC64_GOT_DTPREL16_HI: 5236 case R_PPC64_GOT_DTPREL16_HA: 5237 tls_type = TLS_TLS | TLS_DTPREL; 5238 goto dogot; 5239 5240 case R_PPC64_GOT16: 5241 case R_PPC64_GOT16_DS: 5242 case R_PPC64_GOT16_HA: 5243 case R_PPC64_GOT16_HI: 5244 case R_PPC64_GOT16_LO: 5245 case R_PPC64_GOT16_LO_DS: 5246 dogot: 5247 { 5248 struct got_entry *ent; 5249 5250 if (h != NULL) 5251 ent = h->got.glist; 5252 else 5253 ent = local_got_ents[r_symndx]; 5254 5255 for (; ent != NULL; ent = ent->next) 5256 if (ent->addend == rel->r_addend 5257 && ent->owner == abfd 5258 && ent->tls_type == tls_type) 5259 break; 5260 if (ent == NULL) 5261 abort (); 5262 if (ent->got.refcount > 0) 5263 ent->got.refcount -= 1; 5264 } 5265 break; 5266 5267 case R_PPC64_PLT16_HA: 5268 case R_PPC64_PLT16_HI: 5269 case R_PPC64_PLT16_LO: 5270 case R_PPC64_PLT32: 5271 case R_PPC64_PLT64: 5272 case R_PPC64_REL14: 5273 case R_PPC64_REL14_BRNTAKEN: 5274 case R_PPC64_REL14_BRTAKEN: 5275 case R_PPC64_REL24: 5276 if (h != NULL) 5277 { 5278 struct plt_entry *ent; 5279 5280 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 5281 if (ent->addend == rel->r_addend) 5282 break; 5283 if (ent == NULL) 5284 abort (); 5285 if (ent->plt.refcount > 0) 5286 ent->plt.refcount -= 1; 5287 } 5288 break; 5289 5290 default: 5291 break; 5292 } 5293 } 5294 return TRUE; 5295} 5296 5297/* The maximum size of .sfpr. */ 5298#define SFPR_MAX (218*4) 5299 5300struct sfpr_def_parms 5301{ 5302 const char name[12]; 5303 unsigned char lo, hi; 5304 bfd_byte * (*write_ent) (bfd *, bfd_byte *, int); 5305 bfd_byte * (*write_tail) (bfd *, bfd_byte *, int); 5306}; 5307 5308/* Auto-generate _save*, _rest* functions in .sfpr. */ 5309 5310static unsigned int 5311sfpr_define (struct bfd_link_info *info, const struct sfpr_def_parms *parm) 5312{ 5313 struct ppc_link_hash_table *htab = ppc_hash_table (info); 5314 unsigned int i; 5315 size_t len = strlen (parm->name); 5316 bfd_boolean writing = FALSE; 5317 char sym[16]; 5318 5319 memcpy (sym, parm->name, len); 5320 sym[len + 2] = 0; 5321 5322 for (i = parm->lo; i <= parm->hi; i++) 5323 { 5324 struct elf_link_hash_entry *h; 5325 5326 sym[len + 0] = i / 10 + '0'; 5327 sym[len + 1] = i % 10 + '0'; 5328 h = elf_link_hash_lookup (&htab->elf, sym, FALSE, FALSE, TRUE); 5329 if (h != NULL 5330 && !h->def_regular) 5331 { 5332 h->root.type = bfd_link_hash_defined; 5333 h->root.u.def.section = htab->sfpr; 5334 h->root.u.def.value = htab->sfpr->size; 5335 h->type = STT_FUNC; 5336 h->def_regular = 1; 5337 _bfd_elf_link_hash_hide_symbol (info, h, TRUE); 5338 writing = TRUE; 5339 if (htab->sfpr->contents == NULL) 5340 { 5341 htab->sfpr->contents = bfd_alloc (htab->elf.dynobj, SFPR_MAX); 5342 if (htab->sfpr->contents == NULL) 5343 return FALSE; 5344 } 5345 } 5346 if (writing) 5347 { 5348 bfd_byte *p = htab->sfpr->contents + htab->sfpr->size; 5349 if (i != parm->hi) 5350 p = (*parm->write_ent) (htab->elf.dynobj, p, i); 5351 else 5352 p = (*parm->write_tail) (htab->elf.dynobj, p, i); 5353 htab->sfpr->size = p - htab->sfpr->contents; 5354 } 5355 } 5356 5357 return TRUE; 5358} 5359 5360static bfd_byte * 5361savegpr0 (bfd *abfd, bfd_byte *p, int r) 5362{ 5363 bfd_put_32 (abfd, STD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5364 return p + 4; 5365} 5366 5367static bfd_byte * 5368savegpr0_tail (bfd *abfd, bfd_byte *p, int r) 5369{ 5370 p = savegpr0 (abfd, p, r); 5371 bfd_put_32 (abfd, STD_R0_0R1 + 16, p); 5372 p = p + 4; 5373 bfd_put_32 (abfd, BLR, p); 5374 return p + 4; 5375} 5376 5377static bfd_byte * 5378restgpr0 (bfd *abfd, bfd_byte *p, int r) 5379{ 5380 bfd_put_32 (abfd, LD_R0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5381 return p + 4; 5382} 5383 5384static bfd_byte * 5385restgpr0_tail (bfd *abfd, bfd_byte *p, int r) 5386{ 5387 bfd_put_32 (abfd, LD_R0_0R1 + 16, p); 5388 p = p + 4; 5389 p = restgpr0 (abfd, p, r); 5390 bfd_put_32 (abfd, MTLR_R0, p); 5391 p = p + 4; 5392 if (r == 29) 5393 { 5394 p = restgpr0 (abfd, p, 30); 5395 p = restgpr0 (abfd, p, 31); 5396 } 5397 bfd_put_32 (abfd, BLR, p); 5398 return p + 4; 5399} 5400 5401static bfd_byte * 5402savegpr1 (bfd *abfd, bfd_byte *p, int r) 5403{ 5404 bfd_put_32 (abfd, STD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5405 return p + 4; 5406} 5407 5408static bfd_byte * 5409savegpr1_tail (bfd *abfd, bfd_byte *p, int r) 5410{ 5411 p = savegpr1 (abfd, p, r); 5412 bfd_put_32 (abfd, BLR, p); 5413 return p + 4; 5414} 5415 5416static bfd_byte * 5417restgpr1 (bfd *abfd, bfd_byte *p, int r) 5418{ 5419 bfd_put_32 (abfd, LD_R0_0R12 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5420 return p + 4; 5421} 5422 5423static bfd_byte * 5424restgpr1_tail (bfd *abfd, bfd_byte *p, int r) 5425{ 5426 p = restgpr1 (abfd, p, r); 5427 bfd_put_32 (abfd, BLR, p); 5428 return p + 4; 5429} 5430 5431static bfd_byte * 5432savefpr (bfd *abfd, bfd_byte *p, int r) 5433{ 5434 bfd_put_32 (abfd, STFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5435 return p + 4; 5436} 5437 5438static bfd_byte * 5439savefpr0_tail (bfd *abfd, bfd_byte *p, int r) 5440{ 5441 p = savefpr (abfd, p, r); 5442 bfd_put_32 (abfd, STD_R0_0R1 + 16, p); 5443 p = p + 4; 5444 bfd_put_32 (abfd, BLR, p); 5445 return p + 4; 5446} 5447 5448static bfd_byte * 5449restfpr (bfd *abfd, bfd_byte *p, int r) 5450{ 5451 bfd_put_32 (abfd, LFD_FR0_0R1 + (r << 21) + (1 << 16) - (32 - r) * 8, p); 5452 return p + 4; 5453} 5454 5455static bfd_byte * 5456restfpr0_tail (bfd *abfd, bfd_byte *p, int r) 5457{ 5458 bfd_put_32 (abfd, LD_R0_0R1 + 16, p); 5459 p = p + 4; 5460 p = restfpr (abfd, p, r); 5461 bfd_put_32 (abfd, MTLR_R0, p); 5462 p = p + 4; 5463 if (r == 29) 5464 { 5465 p = restfpr (abfd, p, 30); 5466 p = restfpr (abfd, p, 31); 5467 } 5468 bfd_put_32 (abfd, BLR, p); 5469 return p + 4; 5470} 5471 5472static bfd_byte * 5473savefpr1_tail (bfd *abfd, bfd_byte *p, int r) 5474{ 5475 p = savefpr (abfd, p, r); 5476 bfd_put_32 (abfd, BLR, p); 5477 return p + 4; 5478} 5479 5480static bfd_byte * 5481restfpr1_tail (bfd *abfd, bfd_byte *p, int r) 5482{ 5483 p = restfpr (abfd, p, r); 5484 bfd_put_32 (abfd, BLR, p); 5485 return p + 4; 5486} 5487 5488static bfd_byte * 5489savevr (bfd *abfd, bfd_byte *p, int r) 5490{ 5491 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p); 5492 p = p + 4; 5493 bfd_put_32 (abfd, STVX_VR0_R12_R0 + (r << 21), p); 5494 return p + 4; 5495} 5496 5497static bfd_byte * 5498savevr_tail (bfd *abfd, bfd_byte *p, int r) 5499{ 5500 p = savevr (abfd, p, r); 5501 bfd_put_32 (abfd, BLR, p); 5502 return p + 4; 5503} 5504 5505static bfd_byte * 5506restvr (bfd *abfd, bfd_byte *p, int r) 5507{ 5508 bfd_put_32 (abfd, LI_R12_0 + (1 << 16) - (32 - r) * 16, p); 5509 p = p + 4; 5510 bfd_put_32 (abfd, LVX_VR0_R12_R0 + (r << 21), p); 5511 return p + 4; 5512} 5513 5514static bfd_byte * 5515restvr_tail (bfd *abfd, bfd_byte *p, int r) 5516{ 5517 p = restvr (abfd, p, r); 5518 bfd_put_32 (abfd, BLR, p); 5519 return p + 4; 5520} 5521 5522/* Called via elf_link_hash_traverse to transfer dynamic linking 5523 information on function code symbol entries to their corresponding 5524 function descriptor symbol entries. */ 5525 5526static bfd_boolean 5527func_desc_adjust (struct elf_link_hash_entry *h, void *inf) 5528{ 5529 struct bfd_link_info *info; 5530 struct ppc_link_hash_table *htab; 5531 struct plt_entry *ent; 5532 struct ppc_link_hash_entry *fh; 5533 struct ppc_link_hash_entry *fdh; 5534 bfd_boolean force_local; 5535 5536 fh = (struct ppc_link_hash_entry *) h; 5537 if (fh->elf.root.type == bfd_link_hash_indirect) 5538 return TRUE; 5539 5540 if (fh->elf.root.type == bfd_link_hash_warning) 5541 fh = (struct ppc_link_hash_entry *) fh->elf.root.u.i.link; 5542 5543 info = inf; 5544 htab = ppc_hash_table (info); 5545 5546 /* Resolve undefined references to dot-symbols as the value 5547 in the function descriptor, if we have one in a regular object. 5548 This is to satisfy cases like ".quad .foo". Calls to functions 5549 in dynamic objects are handled elsewhere. */ 5550 if (fh->elf.root.type == bfd_link_hash_undefweak 5551 && fh->was_undefined 5552 && (fh->oh->elf.root.type == bfd_link_hash_defined 5553 || fh->oh->elf.root.type == bfd_link_hash_defweak) 5554 && get_opd_info (fh->oh->elf.root.u.def.section) != NULL 5555 && opd_entry_value (fh->oh->elf.root.u.def.section, 5556 fh->oh->elf.root.u.def.value, 5557 &fh->elf.root.u.def.section, 5558 &fh->elf.root.u.def.value) != (bfd_vma) -1) 5559 { 5560 fh->elf.root.type = fh->oh->elf.root.type; 5561 fh->elf.forced_local = 1; 5562 } 5563 5564 /* If this is a function code symbol, transfer dynamic linking 5565 information to the function descriptor symbol. */ 5566 if (!fh->is_func) 5567 return TRUE; 5568 5569 for (ent = fh->elf.plt.plist; ent != NULL; ent = ent->next) 5570 if (ent->plt.refcount > 0) 5571 break; 5572 if (ent == NULL 5573 || fh->elf.root.root.string[0] != '.' 5574 || fh->elf.root.root.string[1] == '\0') 5575 return TRUE; 5576 5577 /* Find the corresponding function descriptor symbol. Create it 5578 as undefined if necessary. */ 5579 5580 fdh = get_fdh (fh, htab); 5581 if (fdh != NULL) 5582 while (fdh->elf.root.type == bfd_link_hash_indirect 5583 || fdh->elf.root.type == bfd_link_hash_warning) 5584 fdh = (struct ppc_link_hash_entry *) fdh->elf.root.u.i.link; 5585 5586 if (fdh == NULL 5587 && info->shared 5588 && (fh->elf.root.type == bfd_link_hash_undefined 5589 || fh->elf.root.type == bfd_link_hash_undefweak)) 5590 { 5591 fdh = make_fdh (info, fh); 5592 if (fdh == NULL) 5593 return FALSE; 5594 } 5595 5596 /* Fake function descriptors are made undefweak. If the function 5597 code symbol is strong undefined, make the fake sym the same. 5598 If the function code symbol is defined, then force the fake 5599 descriptor local; We can't support overriding of symbols in a 5600 shared library on a fake descriptor. */ 5601 5602 if (fdh != NULL 5603 && fdh->fake 5604 && fdh->elf.root.type == bfd_link_hash_undefweak) 5605 { 5606 if (fh->elf.root.type == bfd_link_hash_undefined) 5607 { 5608 fdh->elf.root.type = bfd_link_hash_undefined; 5609 bfd_link_add_undef (&htab->elf.root, &fdh->elf.root); 5610 } 5611 else if (fh->elf.root.type == bfd_link_hash_defined 5612 || fh->elf.root.type == bfd_link_hash_defweak) 5613 { 5614 _bfd_elf_link_hash_hide_symbol (info, &fdh->elf, TRUE); 5615 } 5616 } 5617 5618 if (fdh != NULL 5619 && !fdh->elf.forced_local 5620 && (info->shared 5621 || fdh->elf.def_dynamic 5622 || fdh->elf.ref_dynamic 5623 || (fdh->elf.root.type == bfd_link_hash_undefweak 5624 && ELF_ST_VISIBILITY (fdh->elf.other) == STV_DEFAULT))) 5625 { 5626 if (fdh->elf.dynindx == -1) 5627 if (! bfd_elf_link_record_dynamic_symbol (info, &fdh->elf)) 5628 return FALSE; 5629 fdh->elf.ref_regular |= fh->elf.ref_regular; 5630 fdh->elf.ref_dynamic |= fh->elf.ref_dynamic; 5631 fdh->elf.ref_regular_nonweak |= fh->elf.ref_regular_nonweak; 5632 fdh->elf.non_got_ref |= fh->elf.non_got_ref; 5633 if (ELF_ST_VISIBILITY (fh->elf.other) == STV_DEFAULT) 5634 { 5635 move_plt_plist (fh, fdh); 5636 fdh->elf.needs_plt = 1; 5637 } 5638 fdh->is_func_descriptor = 1; 5639 fdh->oh = fh; 5640 fh->oh = fdh; 5641 } 5642 5643 /* Now that the info is on the function descriptor, clear the 5644 function code sym info. Any function code syms for which we 5645 don't have a definition in a regular file, we force local. 5646 This prevents a shared library from exporting syms that have 5647 been imported from another library. Function code syms that 5648 are really in the library we must leave global to prevent the 5649 linker dragging in a definition from a static library. */ 5650 force_local = (!fh->elf.def_regular 5651 || fdh == NULL 5652 || !fdh->elf.def_regular 5653 || fdh->elf.forced_local); 5654 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local); 5655 5656 return TRUE; 5657} 5658 5659/* Called near the start of bfd_elf_size_dynamic_sections. We use 5660 this hook to a) provide some gcc support functions, and b) transfer 5661 dynamic linking information gathered so far on function code symbol 5662 entries, to their corresponding function descriptor symbol entries. */ 5663 5664static bfd_boolean 5665ppc64_elf_func_desc_adjust (bfd *obfd ATTRIBUTE_UNUSED, 5666 struct bfd_link_info *info) 5667{ 5668 struct ppc_link_hash_table *htab; 5669 unsigned int i; 5670 const struct sfpr_def_parms funcs[] = 5671 { 5672 { "_savegpr0_", 14, 31, savegpr0, savegpr0_tail }, 5673 { "_restgpr0_", 14, 29, restgpr0, restgpr0_tail }, 5674 { "_restgpr0_", 30, 31, restgpr0, restgpr0_tail }, 5675 { "_savegpr1_", 14, 31, savegpr1, savegpr1_tail }, 5676 { "_restgpr1_", 14, 31, restgpr1, restgpr1_tail }, 5677 { "_savefpr_", 14, 31, savefpr, savefpr0_tail }, 5678 { "_restfpr_", 14, 29, restfpr, restfpr0_tail }, 5679 { "_restfpr_", 30, 31, restfpr, restfpr0_tail }, 5680 { "._savef", 14, 31, savefpr, savefpr1_tail }, 5681 { "._restf", 14, 31, restfpr, restfpr1_tail }, 5682 { "_savevr_", 20, 31, savevr, savevr_tail }, 5683 { "_restvr_", 20, 31, restvr, restvr_tail } 5684 }; 5685 5686 htab = ppc_hash_table (info); 5687 if (htab->sfpr == NULL) 5688 /* We don't have any relocs. */ 5689 return TRUE; 5690 5691 /* Provide any missing _save* and _rest* functions. */ 5692 htab->sfpr->size = 0; 5693 for (i = 0; i < sizeof (funcs) / sizeof (funcs[0]); i++) 5694 if (!sfpr_define (info, &funcs[i])) 5695 return FALSE; 5696 5697 elf_link_hash_traverse (&htab->elf, func_desc_adjust, info); 5698 5699 if (htab->sfpr->size == 0) 5700 htab->sfpr->flags |= SEC_EXCLUDE; 5701 5702 return TRUE; 5703} 5704 5705/* Adjust a symbol defined by a dynamic object and referenced by a 5706 regular object. The current definition is in some section of the 5707 dynamic object, but we're not including those sections. We have to 5708 change the definition to something the rest of the link can 5709 understand. */ 5710 5711static bfd_boolean 5712ppc64_elf_adjust_dynamic_symbol (struct bfd_link_info *info, 5713 struct elf_link_hash_entry *h) 5714{ 5715 struct ppc_link_hash_table *htab; 5716 asection *s; 5717 unsigned int power_of_two; 5718 5719 htab = ppc_hash_table (info); 5720 5721 /* Deal with function syms. */ 5722 if (h->type == STT_FUNC 5723 || h->needs_plt) 5724 { 5725 /* Clear procedure linkage table information for any symbol that 5726 won't need a .plt entry. */ 5727 struct plt_entry *ent; 5728 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 5729 if (ent->plt.refcount > 0) 5730 break; 5731 if (ent == NULL 5732 || SYMBOL_CALLS_LOCAL (info, h) 5733 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT 5734 && h->root.type == bfd_link_hash_undefweak)) 5735 { 5736 h->plt.plist = NULL; 5737 h->needs_plt = 0; 5738 } 5739 } 5740 else 5741 h->plt.plist = NULL; 5742 5743 /* If this is a weak symbol, and there is a real definition, the 5744 processor independent code will have arranged for us to see the 5745 real definition first, and we can just use the same value. */ 5746 if (h->u.weakdef != NULL) 5747 { 5748 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined 5749 || h->u.weakdef->root.type == bfd_link_hash_defweak); 5750 h->root.u.def.section = h->u.weakdef->root.u.def.section; 5751 h->root.u.def.value = h->u.weakdef->root.u.def.value; 5752 if (ELIMINATE_COPY_RELOCS) 5753 h->non_got_ref = h->u.weakdef->non_got_ref; 5754 return TRUE; 5755 } 5756 5757 /* If we are creating a shared library, we must presume that the 5758 only references to the symbol are via the global offset table. 5759 For such cases we need not do anything here; the relocations will 5760 be handled correctly by relocate_section. */ 5761 if (info->shared) 5762 return TRUE; 5763 5764 /* If there are no references to this symbol that do not use the 5765 GOT, we don't need to generate a copy reloc. */ 5766 if (!h->non_got_ref) 5767 return TRUE; 5768 5769 if (ELIMINATE_COPY_RELOCS) 5770 { 5771 struct ppc_link_hash_entry * eh; 5772 struct ppc_dyn_relocs *p; 5773 5774 eh = (struct ppc_link_hash_entry *) h; 5775 for (p = eh->dyn_relocs; p != NULL; p = p->next) 5776 { 5777 s = p->sec->output_section; 5778 if (s != NULL && (s->flags & SEC_READONLY) != 0) 5779 break; 5780 } 5781 5782 /* If we didn't find any dynamic relocs in read-only sections, then 5783 we'll be keeping the dynamic relocs and avoiding the copy reloc. */ 5784 if (p == NULL) 5785 { 5786 h->non_got_ref = 0; 5787 return TRUE; 5788 } 5789 } 5790 5791 if (h->plt.plist != NULL) 5792 { 5793 /* We should never get here, but unfortunately there are versions 5794 of gcc out there that improperly (for this ABI) put initialized 5795 function pointers, vtable refs and suchlike in read-only 5796 sections. Allow them to proceed, but warn that this might 5797 break at runtime. */ 5798 (*_bfd_error_handler) 5799 (_("copy reloc against `%s' requires lazy plt linking; " 5800 "avoid setting LD_BIND_NOW=1 or upgrade gcc"), 5801 h->root.root.string); 5802 } 5803 5804 /* This is a reference to a symbol defined by a dynamic object which 5805 is not a function. */ 5806 5807 if (h->size == 0) 5808 { 5809 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), 5810 h->root.root.string); 5811 return TRUE; 5812 } 5813 5814 /* We must allocate the symbol in our .dynbss section, which will 5815 become part of the .bss section of the executable. There will be 5816 an entry for this symbol in the .dynsym section. The dynamic 5817 object will contain position independent code, so all references 5818 from the dynamic object to this symbol will go through the global 5819 offset table. The dynamic linker will use the .dynsym entry to 5820 determine the address it must put in the global offset table, so 5821 both the dynamic object and the regular object will refer to the 5822 same memory location for the variable. */ 5823 5824 /* We must generate a R_PPC64_COPY reloc to tell the dynamic linker 5825 to copy the initial value out of the dynamic object and into the 5826 runtime process image. We need to remember the offset into the 5827 .rela.bss section we are going to use. */ 5828 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) 5829 { 5830 htab->relbss->size += sizeof (Elf64_External_Rela); 5831 h->needs_copy = 1; 5832 } 5833 5834 /* We need to figure out the alignment required for this symbol. I 5835 have no idea how ELF linkers handle this. */ 5836 power_of_two = bfd_log2 (h->size); 5837 if (power_of_two > 4) 5838 power_of_two = 4; 5839 5840 /* Apply the required alignment. */ 5841 s = htab->dynbss; 5842 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); 5843 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) 5844 { 5845 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) 5846 return FALSE; 5847 } 5848 5849 /* Define the symbol as being at this point in the section. */ 5850 h->root.u.def.section = s; 5851 h->root.u.def.value = s->size; 5852 5853 /* Increment the section size to make room for the symbol. */ 5854 s->size += h->size; 5855 5856 return TRUE; 5857} 5858 5859/* If given a function descriptor symbol, hide both the function code 5860 sym and the descriptor. */ 5861static void 5862ppc64_elf_hide_symbol (struct bfd_link_info *info, 5863 struct elf_link_hash_entry *h, 5864 bfd_boolean force_local) 5865{ 5866 struct ppc_link_hash_entry *eh; 5867 _bfd_elf_link_hash_hide_symbol (info, h, force_local); 5868 5869 eh = (struct ppc_link_hash_entry *) h; 5870 if (eh->is_func_descriptor) 5871 { 5872 struct ppc_link_hash_entry *fh = eh->oh; 5873 5874 if (fh == NULL) 5875 { 5876 const char *p, *q; 5877 struct ppc_link_hash_table *htab; 5878 char save; 5879 5880 /* We aren't supposed to use alloca in BFD because on 5881 systems which do not have alloca the version in libiberty 5882 calls xmalloc, which might cause the program to crash 5883 when it runs out of memory. This function doesn't have a 5884 return status, so there's no way to gracefully return an 5885 error. So cheat. We know that string[-1] can be safely 5886 accessed; It's either a string in an ELF string table, 5887 or allocated in an objalloc structure. */ 5888 5889 p = eh->elf.root.root.string - 1; 5890 save = *p; 5891 *(char *) p = '.'; 5892 htab = ppc_hash_table (info); 5893 fh = (struct ppc_link_hash_entry *) 5894 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE); 5895 *(char *) p = save; 5896 5897 /* Unfortunately, if it so happens that the string we were 5898 looking for was allocated immediately before this string, 5899 then we overwrote the string terminator. That's the only 5900 reason the lookup should fail. */ 5901 if (fh == NULL) 5902 { 5903 q = eh->elf.root.root.string + strlen (eh->elf.root.root.string); 5904 while (q >= eh->elf.root.root.string && *q == *p) 5905 --q, --p; 5906 if (q < eh->elf.root.root.string && *p == '.') 5907 fh = (struct ppc_link_hash_entry *) 5908 elf_link_hash_lookup (&htab->elf, p, FALSE, FALSE, FALSE); 5909 } 5910 if (fh != NULL) 5911 { 5912 eh->oh = fh; 5913 fh->oh = eh; 5914 } 5915 } 5916 if (fh != NULL) 5917 _bfd_elf_link_hash_hide_symbol (info, &fh->elf, force_local); 5918 } 5919} 5920 5921static bfd_boolean 5922get_sym_h (struct elf_link_hash_entry **hp, 5923 Elf_Internal_Sym **symp, 5924 asection **symsecp, 5925 char **tls_maskp, 5926 Elf_Internal_Sym **locsymsp, 5927 unsigned long r_symndx, 5928 bfd *ibfd) 5929{ 5930 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 5931 5932 if (r_symndx >= symtab_hdr->sh_info) 5933 { 5934 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (ibfd); 5935 struct elf_link_hash_entry *h; 5936 5937 h = sym_hashes[r_symndx - symtab_hdr->sh_info]; 5938 while (h->root.type == bfd_link_hash_indirect 5939 || h->root.type == bfd_link_hash_warning) 5940 h = (struct elf_link_hash_entry *) h->root.u.i.link; 5941 5942 if (hp != NULL) 5943 *hp = h; 5944 5945 if (symp != NULL) 5946 *symp = NULL; 5947 5948 if (symsecp != NULL) 5949 { 5950 asection *symsec = NULL; 5951 if (h->root.type == bfd_link_hash_defined 5952 || h->root.type == bfd_link_hash_defweak) 5953 symsec = h->root.u.def.section; 5954 *symsecp = symsec; 5955 } 5956 5957 if (tls_maskp != NULL) 5958 { 5959 struct ppc_link_hash_entry *eh; 5960 5961 eh = (struct ppc_link_hash_entry *) h; 5962 *tls_maskp = &eh->tls_mask; 5963 } 5964 } 5965 else 5966 { 5967 Elf_Internal_Sym *sym; 5968 Elf_Internal_Sym *locsyms = *locsymsp; 5969 5970 if (locsyms == NULL) 5971 { 5972 locsyms = (Elf_Internal_Sym *) symtab_hdr->contents; 5973 if (locsyms == NULL) 5974 locsyms = bfd_elf_get_elf_syms (ibfd, symtab_hdr, 5975 symtab_hdr->sh_info, 5976 0, NULL, NULL, NULL); 5977 if (locsyms == NULL) 5978 return FALSE; 5979 *locsymsp = locsyms; 5980 } 5981 sym = locsyms + r_symndx; 5982 5983 if (hp != NULL) 5984 *hp = NULL; 5985 5986 if (symp != NULL) 5987 *symp = sym; 5988 5989 if (symsecp != NULL) 5990 { 5991 asection *symsec = NULL; 5992 if ((sym->st_shndx != SHN_UNDEF 5993 && sym->st_shndx < SHN_LORESERVE) 5994 || sym->st_shndx > SHN_HIRESERVE) 5995 symsec = bfd_section_from_elf_index (ibfd, sym->st_shndx); 5996 *symsecp = symsec; 5997 } 5998 5999 if (tls_maskp != NULL) 6000 { 6001 struct got_entry **lgot_ents; 6002 char *tls_mask; 6003 6004 tls_mask = NULL; 6005 lgot_ents = elf_local_got_ents (ibfd); 6006 if (lgot_ents != NULL) 6007 { 6008 char *lgot_masks = (char *) (lgot_ents + symtab_hdr->sh_info); 6009 tls_mask = &lgot_masks[r_symndx]; 6010 } 6011 *tls_maskp = tls_mask; 6012 } 6013 } 6014 return TRUE; 6015} 6016 6017/* Returns TLS_MASKP for the given REL symbol. Function return is 0 on 6018 error, 2 on a toc GD type suitable for optimization, 3 on a toc LD 6019 type suitable for optimization, and 1 otherwise. */ 6020 6021static int 6022get_tls_mask (char **tls_maskp, unsigned long *toc_symndx, 6023 Elf_Internal_Sym **locsymsp, 6024 const Elf_Internal_Rela *rel, bfd *ibfd) 6025{ 6026 unsigned long r_symndx; 6027 int next_r; 6028 struct elf_link_hash_entry *h; 6029 Elf_Internal_Sym *sym; 6030 asection *sec; 6031 bfd_vma off; 6032 6033 r_symndx = ELF64_R_SYM (rel->r_info); 6034 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd)) 6035 return 0; 6036 6037 if ((*tls_maskp != NULL && **tls_maskp != 0) 6038 || sec == NULL 6039 || ppc64_elf_section_data (sec)->t_symndx == NULL) 6040 return 1; 6041 6042 /* Look inside a TOC section too. */ 6043 if (h != NULL) 6044 { 6045 BFD_ASSERT (h->root.type == bfd_link_hash_defined); 6046 off = h->root.u.def.value; 6047 } 6048 else 6049 off = sym->st_value; 6050 off += rel->r_addend; 6051 BFD_ASSERT (off % 8 == 0); 6052 r_symndx = ppc64_elf_section_data (sec)->t_symndx[off / 8]; 6053 next_r = ppc64_elf_section_data (sec)->t_symndx[off / 8 + 1]; 6054 if (!get_sym_h (&h, &sym, &sec, tls_maskp, locsymsp, r_symndx, ibfd)) 6055 return 0; 6056 if (toc_symndx != NULL) 6057 *toc_symndx = r_symndx; 6058 if ((h == NULL 6059 || ((h->root.type == bfd_link_hash_defined 6060 || h->root.type == bfd_link_hash_defweak) 6061 && !h->def_dynamic)) 6062 && (next_r == -1 || next_r == -2)) 6063 return 1 - next_r; 6064 return 1; 6065} 6066 6067/* Adjust all global syms defined in opd sections. In gcc generated 6068 code for the old ABI, these will already have been done. */ 6069 6070static bfd_boolean 6071adjust_opd_syms (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED) 6072{ 6073 struct ppc_link_hash_entry *eh; 6074 asection *sym_sec; 6075 long *opd_adjust; 6076 6077 if (h->root.type == bfd_link_hash_indirect) 6078 return TRUE; 6079 6080 if (h->root.type == bfd_link_hash_warning) 6081 h = (struct elf_link_hash_entry *) h->root.u.i.link; 6082 6083 if (h->root.type != bfd_link_hash_defined 6084 && h->root.type != bfd_link_hash_defweak) 6085 return TRUE; 6086 6087 eh = (struct ppc_link_hash_entry *) h; 6088 if (eh->adjust_done) 6089 return TRUE; 6090 6091 sym_sec = eh->elf.root.u.def.section; 6092 opd_adjust = get_opd_info (sym_sec); 6093 if (opd_adjust != NULL) 6094 { 6095 long adjust = opd_adjust[eh->elf.root.u.def.value / 8]; 6096 if (adjust == -1) 6097 { 6098 /* This entry has been deleted. */ 6099 asection *dsec = ppc64_elf_tdata (sym_sec->owner)->u.deleted_section; 6100 if (dsec == NULL) 6101 { 6102 for (dsec = sym_sec->owner->sections; dsec; dsec = dsec->next) 6103 if (elf_discarded_section (dsec)) 6104 { 6105 ppc64_elf_tdata (sym_sec->owner)->u.deleted_section = dsec; 6106 break; 6107 } 6108 } 6109 eh->elf.root.u.def.value = 0; 6110 eh->elf.root.u.def.section = dsec; 6111 } 6112 else 6113 eh->elf.root.u.def.value += adjust; 6114 eh->adjust_done = 1; 6115 } 6116 return TRUE; 6117} 6118 6119/* Handles decrementing dynamic reloc counts for the reloc specified by 6120 R_INFO in section SEC. If LOCAL_SYMS is NULL, then H and SYM_SEC 6121 have already been determined. */ 6122 6123static bfd_boolean 6124dec_dynrel_count (bfd_vma r_info, 6125 asection *sec, 6126 struct bfd_link_info *info, 6127 Elf_Internal_Sym **local_syms, 6128 struct elf_link_hash_entry *h, 6129 asection *sym_sec) 6130{ 6131 enum elf_ppc64_reloc_type r_type; 6132 struct ppc_dyn_relocs *p; 6133 struct ppc_dyn_relocs **pp; 6134 6135 /* Can this reloc be dynamic? This switch, and later tests here 6136 should be kept in sync with the code in check_relocs. */ 6137 r_type = ELF64_R_TYPE (r_info); 6138 switch (r_type) 6139 { 6140 default: 6141 return TRUE; 6142 6143 case R_PPC64_TPREL16: 6144 case R_PPC64_TPREL16_LO: 6145 case R_PPC64_TPREL16_HI: 6146 case R_PPC64_TPREL16_HA: 6147 case R_PPC64_TPREL16_DS: 6148 case R_PPC64_TPREL16_LO_DS: 6149 case R_PPC64_TPREL16_HIGHER: 6150 case R_PPC64_TPREL16_HIGHERA: 6151 case R_PPC64_TPREL16_HIGHEST: 6152 case R_PPC64_TPREL16_HIGHESTA: 6153 if (!info->shared) 6154 return TRUE; 6155 6156 case R_PPC64_TPREL64: 6157 case R_PPC64_DTPMOD64: 6158 case R_PPC64_DTPREL64: 6159 case R_PPC64_ADDR64: 6160 case R_PPC64_REL30: 6161 case R_PPC64_REL32: 6162 case R_PPC64_REL64: 6163 case R_PPC64_ADDR14: 6164 case R_PPC64_ADDR14_BRNTAKEN: 6165 case R_PPC64_ADDR14_BRTAKEN: 6166 case R_PPC64_ADDR16: 6167 case R_PPC64_ADDR16_DS: 6168 case R_PPC64_ADDR16_HA: 6169 case R_PPC64_ADDR16_HI: 6170 case R_PPC64_ADDR16_HIGHER: 6171 case R_PPC64_ADDR16_HIGHERA: 6172 case R_PPC64_ADDR16_HIGHEST: 6173 case R_PPC64_ADDR16_HIGHESTA: 6174 case R_PPC64_ADDR16_LO: 6175 case R_PPC64_ADDR16_LO_DS: 6176 case R_PPC64_ADDR24: 6177 case R_PPC64_ADDR32: 6178 case R_PPC64_UADDR16: 6179 case R_PPC64_UADDR32: 6180 case R_PPC64_UADDR64: 6181 case R_PPC64_TOC: 6182 break; 6183 } 6184 6185 if (local_syms != NULL) 6186 { 6187 unsigned long r_symndx; 6188 Elf_Internal_Sym *sym; 6189 bfd *ibfd = sec->owner; 6190 6191 r_symndx = ELF64_R_SYM (r_info); 6192 if (!get_sym_h (&h, &sym, &sym_sec, NULL, local_syms, r_symndx, ibfd)) 6193 return FALSE; 6194 } 6195 6196 if ((info->shared 6197 && (MUST_BE_DYN_RELOC (r_type) 6198 || (h != NULL 6199 && (!info->symbolic 6200 || h->root.type == bfd_link_hash_defweak 6201 || !h->def_regular)))) 6202 || (ELIMINATE_COPY_RELOCS 6203 && !info->shared 6204 && h != NULL 6205 && (h->root.type == bfd_link_hash_defweak 6206 || !h->def_regular))) 6207 ; 6208 else 6209 return TRUE; 6210 6211 if (h != NULL) 6212 pp = &((struct ppc_link_hash_entry *) h)->dyn_relocs; 6213 else 6214 { 6215 if (sym_sec != NULL) 6216 { 6217 void *vpp = &elf_section_data (sym_sec)->local_dynrel; 6218 pp = (struct ppc_dyn_relocs **) vpp; 6219 } 6220 else 6221 { 6222 void *vpp = &elf_section_data (sec)->local_dynrel; 6223 pp = (struct ppc_dyn_relocs **) vpp; 6224 } 6225 6226 /* elf_gc_sweep may have already removed all dyn relocs associated 6227 with local syms for a given section. Don't report a dynreloc 6228 miscount. */ 6229 if (*pp == NULL) 6230 return TRUE; 6231 } 6232 6233 while ((p = *pp) != NULL) 6234 { 6235 if (p->sec == sec) 6236 { 6237 if (!MUST_BE_DYN_RELOC (r_type)) 6238 p->pc_count -= 1; 6239 p->count -= 1; 6240 if (p->count == 0) 6241 *pp = p->next; 6242 return TRUE; 6243 } 6244 pp = &p->next; 6245 } 6246 6247 (*_bfd_error_handler) (_("dynreloc miscount for %B, section %A"), 6248 sec->owner, sec); 6249 bfd_set_error (bfd_error_bad_value); 6250 return FALSE; 6251} 6252 6253/* Remove unused Official Procedure Descriptor entries. Currently we 6254 only remove those associated with functions in discarded link-once 6255 sections, or weakly defined functions that have been overridden. It 6256 would be possible to remove many more entries for statically linked 6257 applications. */ 6258 6259bfd_boolean 6260ppc64_elf_edit_opd (bfd *obfd, struct bfd_link_info *info, 6261 bfd_boolean no_opd_opt, 6262 bfd_boolean non_overlapping) 6263{ 6264 bfd *ibfd; 6265 bfd_boolean some_edited = FALSE; 6266 asection *need_pad = NULL; 6267 6268 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 6269 { 6270 asection *sec; 6271 Elf_Internal_Rela *relstart, *rel, *relend; 6272 Elf_Internal_Shdr *symtab_hdr; 6273 Elf_Internal_Sym *local_syms; 6274 struct elf_link_hash_entry **sym_hashes; 6275 bfd_vma offset; 6276 bfd_size_type amt; 6277 long *opd_adjust; 6278 bfd_boolean need_edit, add_aux_fields; 6279 bfd_size_type cnt_16b = 0; 6280 6281 sec = bfd_get_section_by_name (ibfd, ".opd"); 6282 if (sec == NULL || sec->size == 0) 6283 continue; 6284 6285 amt = sec->size * sizeof (long) / 8; 6286 opd_adjust = get_opd_info (sec); 6287 if (opd_adjust == NULL) 6288 { 6289 /* check_relocs hasn't been called. Must be a ld -r link 6290 or --just-symbols object. */ 6291 opd_adjust = bfd_alloc (obfd, amt); 6292 if (opd_adjust == NULL) 6293 return FALSE; 6294 ppc64_elf_section_data (sec)->opd.adjust = opd_adjust; 6295 } 6296 memset (opd_adjust, 0, amt); 6297 6298 if (no_opd_opt) 6299 continue; 6300 6301 if (sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS) 6302 continue; 6303 6304 if (sec->output_section == bfd_abs_section_ptr) 6305 continue; 6306 6307 /* Look through the section relocs. */ 6308 if ((sec->flags & SEC_RELOC) == 0 || sec->reloc_count == 0) 6309 continue; 6310 6311 local_syms = NULL; 6312 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 6313 sym_hashes = elf_sym_hashes (ibfd); 6314 6315 /* Read the relocations. */ 6316 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 6317 info->keep_memory); 6318 if (relstart == NULL) 6319 return FALSE; 6320 6321 /* First run through the relocs to check they are sane, and to 6322 determine whether we need to edit this opd section. */ 6323 need_edit = FALSE; 6324 need_pad = sec; 6325 offset = 0; 6326 relend = relstart + sec->reloc_count; 6327 for (rel = relstart; rel < relend; ) 6328 { 6329 enum elf_ppc64_reloc_type r_type; 6330 unsigned long r_symndx; 6331 asection *sym_sec; 6332 struct elf_link_hash_entry *h; 6333 Elf_Internal_Sym *sym; 6334 6335 /* .opd contains a regular array of 16 or 24 byte entries. We're 6336 only interested in the reloc pointing to a function entry 6337 point. */ 6338 if (rel->r_offset != offset 6339 || rel + 1 >= relend 6340 || (rel + 1)->r_offset != offset + 8) 6341 { 6342 /* If someone messes with .opd alignment then after a 6343 "ld -r" we might have padding in the middle of .opd. 6344 Also, there's nothing to prevent someone putting 6345 something silly in .opd with the assembler. No .opd 6346 optimization for them! */ 6347 broken_opd: 6348 (*_bfd_error_handler) 6349 (_("%B: .opd is not a regular array of opd entries"), ibfd); 6350 need_edit = FALSE; 6351 break; 6352 } 6353 6354 if ((r_type = ELF64_R_TYPE (rel->r_info)) != R_PPC64_ADDR64 6355 || (r_type = ELF64_R_TYPE ((rel + 1)->r_info)) != R_PPC64_TOC) 6356 { 6357 (*_bfd_error_handler) 6358 (_("%B: unexpected reloc type %u in .opd section"), 6359 ibfd, r_type); 6360 need_edit = FALSE; 6361 break; 6362 } 6363 6364 r_symndx = ELF64_R_SYM (rel->r_info); 6365 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 6366 r_symndx, ibfd)) 6367 goto error_ret; 6368 6369 if (sym_sec == NULL || sym_sec->owner == NULL) 6370 { 6371 const char *sym_name; 6372 if (h != NULL) 6373 sym_name = h->root.root.string; 6374 else 6375 sym_name = bfd_elf_sym_name (ibfd, symtab_hdr, sym, 6376 sym_sec); 6377 6378 (*_bfd_error_handler) 6379 (_("%B: undefined sym `%s' in .opd section"), 6380 ibfd, sym_name); 6381 need_edit = FALSE; 6382 break; 6383 } 6384 6385 /* opd entries are always for functions defined in the 6386 current input bfd. If the symbol isn't defined in the 6387 input bfd, then we won't be using the function in this 6388 bfd; It must be defined in a linkonce section in another 6389 bfd, or is weak. It's also possible that we are 6390 discarding the function due to a linker script /DISCARD/, 6391 which we test for via the output_section. */ 6392 if (sym_sec->owner != ibfd 6393 || sym_sec->output_section == bfd_abs_section_ptr) 6394 need_edit = TRUE; 6395 6396 rel += 2; 6397 if (rel == relend 6398 || (rel + 1 == relend && rel->r_offset == offset + 16)) 6399 { 6400 if (sec->size == offset + 24) 6401 { 6402 need_pad = NULL; 6403 break; 6404 } 6405 if (rel == relend && sec->size == offset + 16) 6406 { 6407 cnt_16b++; 6408 break; 6409 } 6410 goto broken_opd; 6411 } 6412 6413 if (rel->r_offset == offset + 24) 6414 offset += 24; 6415 else if (rel->r_offset != offset + 16) 6416 goto broken_opd; 6417 else if (rel + 1 < relend 6418 && ELF64_R_TYPE (rel[0].r_info) == R_PPC64_ADDR64 6419 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_TOC) 6420 { 6421 offset += 16; 6422 cnt_16b++; 6423 } 6424 else if (rel + 2 < relend 6425 && ELF64_R_TYPE (rel[1].r_info) == R_PPC64_ADDR64 6426 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_TOC) 6427 { 6428 offset += 24; 6429 rel += 1; 6430 } 6431 else 6432 goto broken_opd; 6433 } 6434 6435 add_aux_fields = non_overlapping && cnt_16b > 0; 6436 6437 if (need_edit || add_aux_fields) 6438 { 6439 Elf_Internal_Rela *write_rel; 6440 bfd_byte *rptr, *wptr; 6441 bfd_byte *new_contents = NULL; 6442 bfd_boolean skip; 6443 long opd_ent_size; 6444 6445 /* This seems a waste of time as input .opd sections are all 6446 zeros as generated by gcc, but I suppose there's no reason 6447 this will always be so. We might start putting something in 6448 the third word of .opd entries. */ 6449 if ((sec->flags & SEC_IN_MEMORY) == 0) 6450 { 6451 bfd_byte *loc; 6452 if (!bfd_malloc_and_get_section (ibfd, sec, &loc)) 6453 { 6454 if (loc != NULL) 6455 free (loc); 6456 error_ret: 6457 if (local_syms != NULL 6458 && symtab_hdr->contents != (unsigned char *) local_syms) 6459 free (local_syms); 6460 if (elf_section_data (sec)->relocs != relstart) 6461 free (relstart); 6462 return FALSE; 6463 } 6464 sec->contents = loc; 6465 sec->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS); 6466 } 6467 6468 elf_section_data (sec)->relocs = relstart; 6469 6470 new_contents = sec->contents; 6471 if (add_aux_fields) 6472 { 6473 new_contents = bfd_malloc (sec->size + cnt_16b * 8); 6474 if (new_contents == NULL) 6475 return FALSE; 6476 need_pad = FALSE; 6477 } 6478 wptr = new_contents; 6479 rptr = sec->contents; 6480 6481 write_rel = relstart; 6482 skip = FALSE; 6483 offset = 0; 6484 opd_ent_size = 0; 6485 for (rel = relstart; rel < relend; rel++) 6486 { 6487 unsigned long r_symndx; 6488 asection *sym_sec; 6489 struct elf_link_hash_entry *h; 6490 Elf_Internal_Sym *sym; 6491 6492 r_symndx = ELF64_R_SYM (rel->r_info); 6493 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 6494 r_symndx, ibfd)) 6495 goto error_ret; 6496 6497 if (rel->r_offset == offset) 6498 { 6499 struct ppc_link_hash_entry *fdh = NULL; 6500 6501 /* See if the .opd entry is full 24 byte or 6502 16 byte (with fd_aux entry overlapped with next 6503 fd_func). */ 6504 opd_ent_size = 24; 6505 if ((rel + 2 == relend && sec->size == offset + 16) 6506 || (rel + 3 < relend 6507 && rel[2].r_offset == offset + 16 6508 && rel[3].r_offset == offset + 24 6509 && ELF64_R_TYPE (rel[2].r_info) == R_PPC64_ADDR64 6510 && ELF64_R_TYPE (rel[3].r_info) == R_PPC64_TOC)) 6511 opd_ent_size = 16; 6512 6513 if (h != NULL 6514 && h->root.root.string[0] == '.') 6515 { 6516 fdh = get_fdh ((struct ppc_link_hash_entry *) h, 6517 ppc_hash_table (info)); 6518 if (fdh != NULL 6519 && fdh->elf.root.type != bfd_link_hash_defined 6520 && fdh->elf.root.type != bfd_link_hash_defweak) 6521 fdh = NULL; 6522 } 6523 6524 skip = (sym_sec->owner != ibfd 6525 || sym_sec->output_section == bfd_abs_section_ptr); 6526 if (skip) 6527 { 6528 if (fdh != NULL && sym_sec->owner == ibfd) 6529 { 6530 /* Arrange for the function descriptor sym 6531 to be dropped. */ 6532 fdh->elf.root.u.def.value = 0; 6533 fdh->elf.root.u.def.section = sym_sec; 6534 } 6535 opd_adjust[rel->r_offset / 8] = -1; 6536 } 6537 else 6538 { 6539 /* We'll be keeping this opd entry. */ 6540 6541 if (fdh != NULL) 6542 { 6543 /* Redefine the function descriptor symbol to 6544 this location in the opd section. It is 6545 necessary to update the value here rather 6546 than using an array of adjustments as we do 6547 for local symbols, because various places 6548 in the generic ELF code use the value 6549 stored in u.def.value. */ 6550 fdh->elf.root.u.def.value = wptr - new_contents; 6551 fdh->adjust_done = 1; 6552 } 6553 6554 /* Local syms are a bit tricky. We could 6555 tweak them as they can be cached, but 6556 we'd need to look through the local syms 6557 for the function descriptor sym which we 6558 don't have at the moment. So keep an 6559 array of adjustments. */ 6560 opd_adjust[rel->r_offset / 8] 6561 = (wptr - new_contents) - (rptr - sec->contents); 6562 6563 if (wptr != rptr) 6564 memcpy (wptr, rptr, opd_ent_size); 6565 wptr += opd_ent_size; 6566 if (add_aux_fields && opd_ent_size == 16) 6567 { 6568 memset (wptr, '\0', 8); 6569 wptr += 8; 6570 } 6571 } 6572 rptr += opd_ent_size; 6573 offset += opd_ent_size; 6574 } 6575 6576 if (skip) 6577 { 6578 if (!NO_OPD_RELOCS 6579 && !info->relocatable 6580 && !dec_dynrel_count (rel->r_info, sec, info, 6581 NULL, h, sym_sec)) 6582 goto error_ret; 6583 } 6584 else 6585 { 6586 /* We need to adjust any reloc offsets to point to the 6587 new opd entries. While we're at it, we may as well 6588 remove redundant relocs. */ 6589 rel->r_offset += opd_adjust[(offset - opd_ent_size) / 8]; 6590 if (write_rel != rel) 6591 memcpy (write_rel, rel, sizeof (*rel)); 6592 ++write_rel; 6593 } 6594 } 6595 6596 sec->size = wptr - new_contents; 6597 sec->reloc_count = write_rel - relstart; 6598 if (add_aux_fields) 6599 { 6600 free (sec->contents); 6601 sec->contents = new_contents; 6602 } 6603 6604 /* Fudge the size too, as this is used later in 6605 elf_bfd_final_link if we are emitting relocs. */ 6606 elf_section_data (sec)->rel_hdr.sh_size 6607 = sec->reloc_count * elf_section_data (sec)->rel_hdr.sh_entsize; 6608 BFD_ASSERT (elf_section_data (sec)->rel_hdr2 == NULL); 6609 some_edited = TRUE; 6610 } 6611 else if (elf_section_data (sec)->relocs != relstart) 6612 free (relstart); 6613 6614 if (local_syms != NULL 6615 && symtab_hdr->contents != (unsigned char *) local_syms) 6616 { 6617 if (!info->keep_memory) 6618 free (local_syms); 6619 else 6620 symtab_hdr->contents = (unsigned char *) local_syms; 6621 } 6622 } 6623 6624 if (some_edited) 6625 elf_link_hash_traverse (elf_hash_table (info), adjust_opd_syms, NULL); 6626 6627 /* If we are doing a final link and the last .opd entry is just 16 byte 6628 long, add a 8 byte padding after it. */ 6629 if (need_pad != NULL && !info->relocatable) 6630 { 6631 bfd_byte *p; 6632 6633 if ((need_pad->flags & SEC_IN_MEMORY) == 0) 6634 { 6635 BFD_ASSERT (need_pad->size > 0); 6636 6637 p = bfd_malloc (need_pad->size + 8); 6638 if (p == NULL) 6639 return FALSE; 6640 6641 if (! bfd_get_section_contents (need_pad->owner, need_pad, 6642 p, 0, need_pad->size)) 6643 return FALSE; 6644 6645 need_pad->contents = p; 6646 need_pad->flags |= (SEC_IN_MEMORY | SEC_HAS_CONTENTS); 6647 } 6648 else 6649 { 6650 p = bfd_realloc (need_pad->contents, need_pad->size + 8); 6651 if (p == NULL) 6652 return FALSE; 6653 6654 need_pad->contents = p; 6655 } 6656 6657 memset (need_pad->contents + need_pad->size, 0, 8); 6658 need_pad->size += 8; 6659 } 6660 6661 return TRUE; 6662} 6663 6664/* Set htab->tls_get_addr and call the generic ELF tls_setup function. */ 6665 6666asection * 6667ppc64_elf_tls_setup (bfd *obfd, struct bfd_link_info *info) 6668{ 6669 struct ppc_link_hash_table *htab; 6670 6671 htab = ppc_hash_table (info); 6672 if (htab->tls_get_addr != NULL) 6673 { 6674 struct ppc_link_hash_entry *h = htab->tls_get_addr; 6675 6676 while (h->elf.root.type == bfd_link_hash_indirect 6677 || h->elf.root.type == bfd_link_hash_warning) 6678 h = (struct ppc_link_hash_entry *) h->elf.root.u.i.link; 6679 6680 htab->tls_get_addr = h; 6681 6682 if (htab->tls_get_addr_fd == NULL 6683 && h->oh != NULL 6684 && h->oh->is_func_descriptor 6685 && (h->oh->elf.root.type == bfd_link_hash_defined 6686 || h->oh->elf.root.type == bfd_link_hash_defweak)) 6687 htab->tls_get_addr_fd = h->oh; 6688 } 6689 6690 if (htab->tls_get_addr_fd != NULL) 6691 { 6692 struct ppc_link_hash_entry *h = htab->tls_get_addr_fd; 6693 6694 while (h->elf.root.type == bfd_link_hash_indirect 6695 || h->elf.root.type == bfd_link_hash_warning) 6696 h = (struct ppc_link_hash_entry *) h->elf.root.u.i.link; 6697 6698 htab->tls_get_addr_fd = h; 6699 } 6700 6701 return _bfd_elf_tls_setup (obfd, info); 6702} 6703 6704/* Run through all the TLS relocs looking for optimization 6705 opportunities. The linker has been hacked (see ppc64elf.em) to do 6706 a preliminary section layout so that we know the TLS segment 6707 offsets. We can't optimize earlier because some optimizations need 6708 to know the tp offset, and we need to optimize before allocating 6709 dynamic relocations. */ 6710 6711bfd_boolean 6712ppc64_elf_tls_optimize (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) 6713{ 6714 bfd *ibfd; 6715 asection *sec; 6716 struct ppc_link_hash_table *htab; 6717 6718 if (info->relocatable || info->shared) 6719 return TRUE; 6720 6721 htab = ppc_hash_table (info); 6722 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 6723 { 6724 Elf_Internal_Sym *locsyms = NULL; 6725 asection *toc = bfd_get_section_by_name (ibfd, ".toc"); 6726 unsigned char *toc_ref = NULL; 6727 6728 /* Look at all the sections for this file, with TOC last. */ 6729 for (sec = (ibfd->sections == toc && toc && toc->next ? toc->next 6730 : ibfd->sections); 6731 sec != NULL; 6732 sec = (sec == toc ? NULL 6733 : sec->next == NULL ? toc 6734 : sec->next == toc && toc->next ? toc->next 6735 : sec->next)) 6736 if (sec->has_tls_reloc && !bfd_is_abs_section (sec->output_section)) 6737 { 6738 Elf_Internal_Rela *relstart, *rel, *relend; 6739 int expecting_tls_get_addr; 6740 long toc_ref_index = 0; 6741 6742 /* Read the relocations. */ 6743 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 6744 info->keep_memory); 6745 if (relstart == NULL) 6746 return FALSE; 6747 6748 expecting_tls_get_addr = 0; 6749 relend = relstart + sec->reloc_count; 6750 for (rel = relstart; rel < relend; rel++) 6751 { 6752 enum elf_ppc64_reloc_type r_type; 6753 unsigned long r_symndx; 6754 struct elf_link_hash_entry *h; 6755 Elf_Internal_Sym *sym; 6756 asection *sym_sec; 6757 char *tls_mask; 6758 char tls_set, tls_clear, tls_type = 0; 6759 bfd_vma value; 6760 bfd_boolean ok_tprel, is_local; 6761 6762 r_symndx = ELF64_R_SYM (rel->r_info); 6763 if (!get_sym_h (&h, &sym, &sym_sec, &tls_mask, &locsyms, 6764 r_symndx, ibfd)) 6765 { 6766 err_free_rel: 6767 if (elf_section_data (sec)->relocs != relstart) 6768 free (relstart); 6769 if (toc_ref != NULL) 6770 free (toc_ref); 6771 if (locsyms != NULL 6772 && (elf_tdata (ibfd)->symtab_hdr.contents 6773 != (unsigned char *) locsyms)) 6774 free (locsyms); 6775 return FALSE; 6776 } 6777 6778 if (h != NULL) 6779 { 6780 if (h->root.type != bfd_link_hash_defined 6781 && h->root.type != bfd_link_hash_defweak) 6782 continue; 6783 value = h->root.u.def.value; 6784 } 6785 else 6786 /* Symbols referenced by TLS relocs must be of type 6787 STT_TLS. So no need for .opd local sym adjust. */ 6788 value = sym->st_value; 6789 6790 ok_tprel = FALSE; 6791 is_local = FALSE; 6792 if (h == NULL 6793 || !h->def_dynamic) 6794 { 6795 is_local = TRUE; 6796 value += sym_sec->output_offset; 6797 value += sym_sec->output_section->vma; 6798 value -= htab->elf.tls_sec->vma; 6799 ok_tprel = (value + TP_OFFSET + ((bfd_vma) 1 << 31) 6800 < (bfd_vma) 1 << 32); 6801 } 6802 6803 r_type = ELF64_R_TYPE (rel->r_info); 6804 switch (r_type) 6805 { 6806 case R_PPC64_GOT_TLSLD16: 6807 case R_PPC64_GOT_TLSLD16_LO: 6808 case R_PPC64_GOT_TLSLD16_HI: 6809 case R_PPC64_GOT_TLSLD16_HA: 6810 /* These relocs should never be against a symbol 6811 defined in a shared lib. Leave them alone if 6812 that turns out to be the case. */ 6813 ppc64_tlsld_got (ibfd)->refcount -= 1; 6814 if (!is_local) 6815 continue; 6816 6817 /* LD -> LE */ 6818 tls_set = 0; 6819 tls_clear = TLS_LD; 6820 tls_type = TLS_TLS | TLS_LD; 6821 expecting_tls_get_addr = 1; 6822 break; 6823 6824 case R_PPC64_GOT_TLSGD16: 6825 case R_PPC64_GOT_TLSGD16_LO: 6826 case R_PPC64_GOT_TLSGD16_HI: 6827 case R_PPC64_GOT_TLSGD16_HA: 6828 if (ok_tprel) 6829 /* GD -> LE */ 6830 tls_set = 0; 6831 else 6832 /* GD -> IE */ 6833 tls_set = TLS_TLS | TLS_TPRELGD; 6834 tls_clear = TLS_GD; 6835 tls_type = TLS_TLS | TLS_GD; 6836 expecting_tls_get_addr = 1; 6837 break; 6838 6839 case R_PPC64_GOT_TPREL16_DS: 6840 case R_PPC64_GOT_TPREL16_LO_DS: 6841 case R_PPC64_GOT_TPREL16_HI: 6842 case R_PPC64_GOT_TPREL16_HA: 6843 expecting_tls_get_addr = 0; 6844 if (ok_tprel) 6845 { 6846 /* IE -> LE */ 6847 tls_set = 0; 6848 tls_clear = TLS_TPREL; 6849 tls_type = TLS_TLS | TLS_TPREL; 6850 break; 6851 } 6852 else 6853 continue; 6854 6855 case R_PPC64_REL14: 6856 case R_PPC64_REL14_BRTAKEN: 6857 case R_PPC64_REL14_BRNTAKEN: 6858 case R_PPC64_REL24: 6859 if (h != NULL 6860 && (h == &htab->tls_get_addr->elf 6861 || h == &htab->tls_get_addr_fd->elf)) 6862 { 6863 if (!expecting_tls_get_addr 6864 && rel != relstart 6865 && ((ELF64_R_TYPE (rel[-1].r_info) 6866 == R_PPC64_TOC16) 6867 || (ELF64_R_TYPE (rel[-1].r_info) 6868 == R_PPC64_TOC16_LO))) 6869 { 6870 /* Check for toc tls entries. */ 6871 char *toc_tls; 6872 int retval; 6873 6874 retval = get_tls_mask (&toc_tls, NULL, &locsyms, 6875 rel - 1, ibfd); 6876 if (retval == 0) 6877 goto err_free_rel; 6878 if (retval > 1 && toc_tls != NULL) 6879 { 6880 expecting_tls_get_addr = 1; 6881 if (toc_ref != NULL) 6882 toc_ref[toc_ref_index] = 1; 6883 } 6884 } 6885 6886 if (expecting_tls_get_addr) 6887 { 6888 struct plt_entry *ent; 6889 for (ent = h->plt.plist; ent; ent = ent->next) 6890 if (ent->addend == 0) 6891 { 6892 if (ent->plt.refcount > 0) 6893 ent->plt.refcount -= 1; 6894 break; 6895 } 6896 } 6897 } 6898 expecting_tls_get_addr = 0; 6899 continue; 6900 6901 case R_PPC64_TOC16: 6902 case R_PPC64_TOC16_LO: 6903 case R_PPC64_TLS: 6904 expecting_tls_get_addr = 0; 6905 if (sym_sec == toc && toc != NULL) 6906 { 6907 /* Mark this toc entry as referenced by a TLS 6908 code sequence. We can do that now in the 6909 case of R_PPC64_TLS, and after checking for 6910 tls_get_addr for the TOC16 relocs. */ 6911 if (toc_ref == NULL) 6912 { 6913 toc_ref = bfd_zmalloc (toc->size / 8); 6914 if (toc_ref == NULL) 6915 goto err_free_rel; 6916 } 6917 if (h != NULL) 6918 value = h->root.u.def.value; 6919 else 6920 value = sym->st_value; 6921 value += rel->r_addend; 6922 BFD_ASSERT (value < toc->size && value % 8 == 0); 6923 toc_ref_index = value / 8; 6924 if (r_type == R_PPC64_TLS) 6925 toc_ref[toc_ref_index] = 1; 6926 } 6927 continue; 6928 6929 case R_PPC64_TPREL64: 6930 expecting_tls_get_addr = 0; 6931 if (sec != toc 6932 || toc_ref == NULL 6933 || !toc_ref[rel->r_offset / 8]) 6934 continue; 6935 if (ok_tprel) 6936 { 6937 /* IE -> LE */ 6938 tls_set = TLS_EXPLICIT; 6939 tls_clear = TLS_TPREL; 6940 break; 6941 } 6942 else 6943 continue; 6944 6945 case R_PPC64_DTPMOD64: 6946 expecting_tls_get_addr = 0; 6947 if (sec != toc 6948 || toc_ref == NULL 6949 || !toc_ref[rel->r_offset / 8]) 6950 continue; 6951 if (rel + 1 < relend 6952 && (rel[1].r_info 6953 == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64)) 6954 && rel[1].r_offset == rel->r_offset + 8) 6955 { 6956 if (ok_tprel) 6957 /* GD -> LE */ 6958 tls_set = TLS_EXPLICIT | TLS_GD; 6959 else 6960 /* GD -> IE */ 6961 tls_set = TLS_EXPLICIT | TLS_GD | TLS_TPRELGD; 6962 tls_clear = TLS_GD; 6963 } 6964 else 6965 { 6966 if (!is_local) 6967 continue; 6968 6969 /* LD -> LE */ 6970 tls_set = TLS_EXPLICIT; 6971 tls_clear = TLS_LD; 6972 } 6973 break; 6974 6975 default: 6976 expecting_tls_get_addr = 0; 6977 continue; 6978 } 6979 6980 if ((tls_set & TLS_EXPLICIT) == 0) 6981 { 6982 struct got_entry *ent; 6983 6984 /* Adjust got entry for this reloc. */ 6985 if (h != NULL) 6986 ent = h->got.glist; 6987 else 6988 ent = elf_local_got_ents (ibfd)[r_symndx]; 6989 6990 for (; ent != NULL; ent = ent->next) 6991 if (ent->addend == rel->r_addend 6992 && ent->owner == ibfd 6993 && ent->tls_type == tls_type) 6994 break; 6995 if (ent == NULL) 6996 abort (); 6997 6998 if (tls_set == 0) 6999 { 7000 /* We managed to get rid of a got entry. */ 7001 if (ent->got.refcount > 0) 7002 ent->got.refcount -= 1; 7003 } 7004 } 7005 else 7006 { 7007 /* If we got rid of a DTPMOD/DTPREL reloc pair then 7008 we'll lose one or two dyn relocs. */ 7009 if (!dec_dynrel_count (rel->r_info, sec, info, 7010 NULL, h, sym_sec)) 7011 return FALSE; 7012 7013 if (tls_set == (TLS_EXPLICIT | TLS_GD)) 7014 { 7015 if (!dec_dynrel_count ((rel + 1)->r_info, sec, info, 7016 NULL, h, sym_sec)) 7017 return FALSE; 7018 } 7019 } 7020 7021 *tls_mask |= tls_set; 7022 *tls_mask &= ~tls_clear; 7023 } 7024 7025 if (elf_section_data (sec)->relocs != relstart) 7026 free (relstart); 7027 } 7028 7029 if (toc_ref != NULL) 7030 free (toc_ref); 7031 7032 if (locsyms != NULL 7033 && (elf_tdata (ibfd)->symtab_hdr.contents 7034 != (unsigned char *) locsyms)) 7035 { 7036 if (!info->keep_memory) 7037 free (locsyms); 7038 else 7039 elf_tdata (ibfd)->symtab_hdr.contents = (unsigned char *) locsyms; 7040 } 7041 } 7042 return TRUE; 7043} 7044 7045/* Called via elf_link_hash_traverse from ppc64_elf_edit_toc to adjust 7046 the values of any global symbols in a toc section that has been 7047 edited. Globals in toc sections should be a rarity, so this function 7048 sets a flag if any are found in toc sections other than the one just 7049 edited, so that futher hash table traversals can be avoided. */ 7050 7051struct adjust_toc_info 7052{ 7053 asection *toc; 7054 unsigned long *skip; 7055 bfd_boolean global_toc_syms; 7056}; 7057 7058static bfd_boolean 7059adjust_toc_syms (struct elf_link_hash_entry *h, void *inf) 7060{ 7061 struct ppc_link_hash_entry *eh; 7062 struct adjust_toc_info *toc_inf = (struct adjust_toc_info *) inf; 7063 7064 if (h->root.type == bfd_link_hash_indirect) 7065 return TRUE; 7066 7067 if (h->root.type == bfd_link_hash_warning) 7068 h = (struct elf_link_hash_entry *) h->root.u.i.link; 7069 7070 if (h->root.type != bfd_link_hash_defined 7071 && h->root.type != bfd_link_hash_defweak) 7072 return TRUE; 7073 7074 eh = (struct ppc_link_hash_entry *) h; 7075 if (eh->adjust_done) 7076 return TRUE; 7077 7078 if (eh->elf.root.u.def.section == toc_inf->toc) 7079 { 7080 unsigned long skip = toc_inf->skip[eh->elf.root.u.def.value >> 3]; 7081 if (skip != (unsigned long) -1) 7082 eh->elf.root.u.def.value -= skip; 7083 else 7084 { 7085 (*_bfd_error_handler) 7086 (_("%s defined in removed toc entry"), eh->elf.root.root.string); 7087 eh->elf.root.u.def.section = &bfd_abs_section; 7088 eh->elf.root.u.def.value = 0; 7089 } 7090 eh->adjust_done = 1; 7091 } 7092 else if (strcmp (eh->elf.root.u.def.section->name, ".toc") == 0) 7093 toc_inf->global_toc_syms = TRUE; 7094 7095 return TRUE; 7096} 7097 7098/* Examine all relocs referencing .toc sections in order to remove 7099 unused .toc entries. */ 7100 7101bfd_boolean 7102ppc64_elf_edit_toc (bfd *obfd ATTRIBUTE_UNUSED, struct bfd_link_info *info) 7103{ 7104 bfd *ibfd; 7105 struct adjust_toc_info toc_inf; 7106 7107 toc_inf.global_toc_syms = TRUE; 7108 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 7109 { 7110 asection *toc, *sec; 7111 Elf_Internal_Shdr *symtab_hdr; 7112 Elf_Internal_Sym *local_syms; 7113 struct elf_link_hash_entry **sym_hashes; 7114 Elf_Internal_Rela *relstart, *rel; 7115 unsigned long *skip, *drop; 7116 unsigned char *used; 7117 unsigned char *keep, last, some_unused; 7118 7119 toc = bfd_get_section_by_name (ibfd, ".toc"); 7120 if (toc == NULL 7121 || toc->size == 0 7122 || toc->sec_info_type == ELF_INFO_TYPE_JUST_SYMS 7123 || elf_discarded_section (toc)) 7124 continue; 7125 7126 local_syms = NULL; 7127 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 7128 sym_hashes = elf_sym_hashes (ibfd); 7129 7130 /* Look at sections dropped from the final link. */ 7131 skip = NULL; 7132 relstart = NULL; 7133 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 7134 { 7135 if (sec->reloc_count == 0 7136 || !elf_discarded_section (sec) 7137 || get_opd_info (sec) 7138 || (sec->flags & SEC_ALLOC) == 0 7139 || (sec->flags & SEC_DEBUGGING) != 0) 7140 continue; 7141 7142 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, FALSE); 7143 if (relstart == NULL) 7144 goto error_ret; 7145 7146 /* Run through the relocs to see which toc entries might be 7147 unused. */ 7148 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 7149 { 7150 enum elf_ppc64_reloc_type r_type; 7151 unsigned long r_symndx; 7152 asection *sym_sec; 7153 struct elf_link_hash_entry *h; 7154 Elf_Internal_Sym *sym; 7155 bfd_vma val; 7156 7157 r_type = ELF64_R_TYPE (rel->r_info); 7158 switch (r_type) 7159 { 7160 default: 7161 continue; 7162 7163 case R_PPC64_TOC16: 7164 case R_PPC64_TOC16_LO: 7165 case R_PPC64_TOC16_HI: 7166 case R_PPC64_TOC16_HA: 7167 case R_PPC64_TOC16_DS: 7168 case R_PPC64_TOC16_LO_DS: 7169 break; 7170 } 7171 7172 r_symndx = ELF64_R_SYM (rel->r_info); 7173 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 7174 r_symndx, ibfd)) 7175 goto error_ret; 7176 7177 if (sym_sec != toc) 7178 continue; 7179 7180 if (h != NULL) 7181 val = h->root.u.def.value; 7182 else 7183 val = sym->st_value; 7184 val += rel->r_addend; 7185 7186 if (val >= toc->size) 7187 continue; 7188 7189 /* Anything in the toc ought to be aligned to 8 bytes. 7190 If not, don't mark as unused. */ 7191 if (val & 7) 7192 continue; 7193 7194 if (skip == NULL) 7195 { 7196 skip = bfd_zmalloc (sizeof (*skip) * (toc->size + 7) / 8); 7197 if (skip == NULL) 7198 goto error_ret; 7199 } 7200 7201 skip[val >> 3] = 1; 7202 } 7203 7204 if (elf_section_data (sec)->relocs != relstart) 7205 free (relstart); 7206 } 7207 7208 if (skip == NULL) 7209 continue; 7210 7211 used = bfd_zmalloc (sizeof (*used) * (toc->size + 7) / 8); 7212 if (used == NULL) 7213 { 7214 error_ret: 7215 if (local_syms != NULL 7216 && symtab_hdr->contents != (unsigned char *) local_syms) 7217 free (local_syms); 7218 if (sec != NULL 7219 && relstart != NULL 7220 && elf_section_data (sec)->relocs != relstart) 7221 free (relstart); 7222 if (skip != NULL) 7223 free (skip); 7224 return FALSE; 7225 } 7226 7227 /* Now check all kept sections that might reference the toc. 7228 Check the toc itself last. */ 7229 for (sec = (ibfd->sections == toc && toc->next ? toc->next 7230 : ibfd->sections); 7231 sec != NULL; 7232 sec = (sec == toc ? NULL 7233 : sec->next == NULL ? toc 7234 : sec->next == toc && toc->next ? toc->next 7235 : sec->next)) 7236 { 7237 int repeat; 7238 7239 if (sec->reloc_count == 0 7240 || elf_discarded_section (sec) 7241 || get_opd_info (sec) 7242 || (sec->flags & SEC_ALLOC) == 0 7243 || (sec->flags & SEC_DEBUGGING) != 0) 7244 continue; 7245 7246 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, TRUE); 7247 if (relstart == NULL) 7248 goto error_ret; 7249 7250 /* Mark toc entries referenced as used. */ 7251 repeat = 0; 7252 do 7253 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 7254 { 7255 enum elf_ppc64_reloc_type r_type; 7256 unsigned long r_symndx; 7257 asection *sym_sec; 7258 struct elf_link_hash_entry *h; 7259 Elf_Internal_Sym *sym; 7260 bfd_vma val; 7261 7262 r_type = ELF64_R_TYPE (rel->r_info); 7263 switch (r_type) 7264 { 7265 case R_PPC64_TOC16: 7266 case R_PPC64_TOC16_LO: 7267 case R_PPC64_TOC16_HI: 7268 case R_PPC64_TOC16_HA: 7269 case R_PPC64_TOC16_DS: 7270 case R_PPC64_TOC16_LO_DS: 7271 /* In case we're taking addresses of toc entries. */ 7272 case R_PPC64_ADDR64: 7273 break; 7274 7275 default: 7276 continue; 7277 } 7278 7279 r_symndx = ELF64_R_SYM (rel->r_info); 7280 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 7281 r_symndx, ibfd)) 7282 { 7283 free (used); 7284 goto error_ret; 7285 } 7286 7287 if (sym_sec != toc) 7288 continue; 7289 7290 if (h != NULL) 7291 val = h->root.u.def.value; 7292 else 7293 val = sym->st_value; 7294 val += rel->r_addend; 7295 7296 if (val >= toc->size) 7297 continue; 7298 7299 /* For the toc section, we only mark as used if 7300 this entry itself isn't unused. */ 7301 if (sec == toc 7302 && !used[val >> 3] 7303 && (used[rel->r_offset >> 3] 7304 || !skip[rel->r_offset >> 3])) 7305 /* Do all the relocs again, to catch reference 7306 chains. */ 7307 repeat = 1; 7308 7309 used[val >> 3] = 1; 7310 } 7311 while (repeat); 7312 } 7313 7314 /* Merge the used and skip arrays. Assume that TOC 7315 doublewords not appearing as either used or unused belong 7316 to to an entry more than one doubleword in size. */ 7317 for (drop = skip, keep = used, last = 0, some_unused = 0; 7318 drop < skip + (toc->size + 7) / 8; 7319 ++drop, ++keep) 7320 { 7321 if (*keep) 7322 { 7323 *drop = 0; 7324 last = 0; 7325 } 7326 else if (*drop) 7327 { 7328 some_unused = 1; 7329 last = 1; 7330 } 7331 else 7332 *drop = last; 7333 } 7334 7335 free (used); 7336 7337 if (some_unused) 7338 { 7339 bfd_byte *contents, *src; 7340 unsigned long off; 7341 7342 /* Shuffle the toc contents, and at the same time convert the 7343 skip array from booleans into offsets. */ 7344 if (!bfd_malloc_and_get_section (ibfd, toc, &contents)) 7345 goto error_ret; 7346 7347 elf_section_data (toc)->this_hdr.contents = contents; 7348 7349 for (src = contents, off = 0, drop = skip; 7350 src < contents + toc->size; 7351 src += 8, ++drop) 7352 { 7353 if (*drop) 7354 { 7355 *drop = (unsigned long) -1; 7356 off += 8; 7357 } 7358 else if (off != 0) 7359 { 7360 *drop = off; 7361 memcpy (src - off, src, 8); 7362 } 7363 } 7364 toc->rawsize = toc->size; 7365 toc->size = src - contents - off; 7366 7367 if (toc->reloc_count != 0) 7368 { 7369 Elf_Internal_Rela *wrel; 7370 bfd_size_type sz; 7371 7372 /* Read toc relocs. */ 7373 relstart = _bfd_elf_link_read_relocs (ibfd, toc, NULL, NULL, 7374 TRUE); 7375 if (relstart == NULL) 7376 goto error_ret; 7377 7378 /* Remove unused toc relocs, and adjust those we keep. */ 7379 wrel = relstart; 7380 for (rel = relstart; rel < relstart + toc->reloc_count; ++rel) 7381 if (skip[rel->r_offset >> 3] != (unsigned long) -1) 7382 { 7383 wrel->r_offset = rel->r_offset - skip[rel->r_offset >> 3]; 7384 wrel->r_info = rel->r_info; 7385 wrel->r_addend = rel->r_addend; 7386 ++wrel; 7387 } 7388 else if (!dec_dynrel_count (rel->r_info, toc, info, 7389 &local_syms, NULL, NULL)) 7390 goto error_ret; 7391 7392 toc->reloc_count = wrel - relstart; 7393 sz = elf_section_data (toc)->rel_hdr.sh_entsize; 7394 elf_section_data (toc)->rel_hdr.sh_size = toc->reloc_count * sz; 7395 BFD_ASSERT (elf_section_data (toc)->rel_hdr2 == NULL); 7396 } 7397 7398 /* Adjust addends for relocs against the toc section sym. */ 7399 for (sec = ibfd->sections; sec != NULL; sec = sec->next) 7400 { 7401 if (sec->reloc_count == 0 7402 || elf_discarded_section (sec)) 7403 continue; 7404 7405 relstart = _bfd_elf_link_read_relocs (ibfd, sec, NULL, NULL, 7406 TRUE); 7407 if (relstart == NULL) 7408 goto error_ret; 7409 7410 for (rel = relstart; rel < relstart + sec->reloc_count; ++rel) 7411 { 7412 enum elf_ppc64_reloc_type r_type; 7413 unsigned long r_symndx; 7414 asection *sym_sec; 7415 struct elf_link_hash_entry *h; 7416 Elf_Internal_Sym *sym; 7417 7418 r_type = ELF64_R_TYPE (rel->r_info); 7419 switch (r_type) 7420 { 7421 default: 7422 continue; 7423 7424 case R_PPC64_TOC16: 7425 case R_PPC64_TOC16_LO: 7426 case R_PPC64_TOC16_HI: 7427 case R_PPC64_TOC16_HA: 7428 case R_PPC64_TOC16_DS: 7429 case R_PPC64_TOC16_LO_DS: 7430 case R_PPC64_ADDR64: 7431 break; 7432 } 7433 7434 r_symndx = ELF64_R_SYM (rel->r_info); 7435 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 7436 r_symndx, ibfd)) 7437 goto error_ret; 7438 7439 if (sym_sec != toc || h != NULL || sym->st_value != 0) 7440 continue; 7441 7442 rel->r_addend -= skip[rel->r_addend >> 3]; 7443 } 7444 } 7445 7446 /* We shouldn't have local or global symbols defined in the TOC, 7447 but handle them anyway. */ 7448 if (local_syms != NULL) 7449 { 7450 Elf_Internal_Sym *sym; 7451 7452 for (sym = local_syms; 7453 sym < local_syms + symtab_hdr->sh_info; 7454 ++sym) 7455 if (sym->st_shndx != SHN_UNDEF 7456 && (sym->st_shndx < SHN_LORESERVE 7457 || sym->st_shndx > SHN_HIRESERVE) 7458 && sym->st_value != 0 7459 && bfd_section_from_elf_index (ibfd, sym->st_shndx) == toc) 7460 { 7461 if (skip[sym->st_value >> 3] != (unsigned long) -1) 7462 sym->st_value -= skip[sym->st_value >> 3]; 7463 else 7464 { 7465 (*_bfd_error_handler) 7466 (_("%s defined in removed toc entry"), 7467 bfd_elf_sym_name (ibfd, symtab_hdr, sym, 7468 NULL)); 7469 sym->st_value = 0; 7470 sym->st_shndx = SHN_ABS; 7471 } 7472 symtab_hdr->contents = (unsigned char *) local_syms; 7473 } 7474 } 7475 7476 /* Finally, adjust any global syms defined in the toc. */ 7477 if (toc_inf.global_toc_syms) 7478 { 7479 toc_inf.toc = toc; 7480 toc_inf.skip = skip; 7481 toc_inf.global_toc_syms = FALSE; 7482 elf_link_hash_traverse (elf_hash_table (info), adjust_toc_syms, 7483 &toc_inf); 7484 } 7485 } 7486 7487 if (local_syms != NULL 7488 && symtab_hdr->contents != (unsigned char *) local_syms) 7489 { 7490 if (!info->keep_memory) 7491 free (local_syms); 7492 else 7493 symtab_hdr->contents = (unsigned char *) local_syms; 7494 } 7495 free (skip); 7496 } 7497 7498 return TRUE; 7499} 7500 7501/* Allocate space in .plt, .got and associated reloc sections for 7502 dynamic relocs. */ 7503 7504static bfd_boolean 7505allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) 7506{ 7507 struct bfd_link_info *info; 7508 struct ppc_link_hash_table *htab; 7509 asection *s; 7510 struct ppc_link_hash_entry *eh; 7511 struct ppc_dyn_relocs *p; 7512 struct got_entry *gent; 7513 7514 if (h->root.type == bfd_link_hash_indirect) 7515 return TRUE; 7516 7517 if (h->root.type == bfd_link_hash_warning) 7518 h = (struct elf_link_hash_entry *) h->root.u.i.link; 7519 7520 info = (struct bfd_link_info *) inf; 7521 htab = ppc_hash_table (info); 7522 7523 if (htab->elf.dynamic_sections_created 7524 && h->dynindx != -1 7525 && WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info->shared, h)) 7526 { 7527 struct plt_entry *pent; 7528 bfd_boolean doneone = FALSE; 7529 for (pent = h->plt.plist; pent != NULL; pent = pent->next) 7530 if (pent->plt.refcount > 0) 7531 { 7532 /* If this is the first .plt entry, make room for the special 7533 first entry. */ 7534 s = htab->plt; 7535 if (s->size == 0) 7536 s->size += PLT_INITIAL_ENTRY_SIZE; 7537 7538 pent->plt.offset = s->size; 7539 7540 /* Make room for this entry. */ 7541 s->size += PLT_ENTRY_SIZE; 7542 7543 /* Make room for the .glink code. */ 7544 s = htab->glink; 7545 if (s->size == 0) 7546 s->size += GLINK_CALL_STUB_SIZE; 7547 /* We need bigger stubs past index 32767. */ 7548 if (s->size >= GLINK_CALL_STUB_SIZE + 32768*2*4) 7549 s->size += 4; 7550 s->size += 2*4; 7551 7552 /* We also need to make an entry in the .rela.plt section. */ 7553 s = htab->relplt; 7554 s->size += sizeof (Elf64_External_Rela); 7555 doneone = TRUE; 7556 } 7557 else 7558 pent->plt.offset = (bfd_vma) -1; 7559 if (!doneone) 7560 { 7561 h->plt.plist = NULL; 7562 h->needs_plt = 0; 7563 } 7564 } 7565 else 7566 { 7567 h->plt.plist = NULL; 7568 h->needs_plt = 0; 7569 } 7570 7571 eh = (struct ppc_link_hash_entry *) h; 7572 /* Run through the TLS GD got entries first if we're changing them 7573 to TPREL. */ 7574 if ((eh->tls_mask & TLS_TPRELGD) != 0) 7575 for (gent = h->got.glist; gent != NULL; gent = gent->next) 7576 if (gent->got.refcount > 0 7577 && (gent->tls_type & TLS_GD) != 0) 7578 { 7579 /* This was a GD entry that has been converted to TPREL. If 7580 there happens to be a TPREL entry we can use that one. */ 7581 struct got_entry *ent; 7582 for (ent = h->got.glist; ent != NULL; ent = ent->next) 7583 if (ent->got.refcount > 0 7584 && (ent->tls_type & TLS_TPREL) != 0 7585 && ent->addend == gent->addend 7586 && ent->owner == gent->owner) 7587 { 7588 gent->got.refcount = 0; 7589 break; 7590 } 7591 7592 /* If not, then we'll be using our own TPREL entry. */ 7593 if (gent->got.refcount != 0) 7594 gent->tls_type = TLS_TLS | TLS_TPREL; 7595 } 7596 7597 for (gent = h->got.glist; gent != NULL; gent = gent->next) 7598 if (gent->got.refcount > 0) 7599 { 7600 bfd_boolean dyn; 7601 7602 /* Make sure this symbol is output as a dynamic symbol. 7603 Undefined weak syms won't yet be marked as dynamic, 7604 nor will all TLS symbols. */ 7605 if (h->dynindx == -1 7606 && !h->forced_local) 7607 { 7608 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 7609 return FALSE; 7610 } 7611 7612 if ((gent->tls_type & TLS_LD) != 0 7613 && !h->def_dynamic) 7614 { 7615 gent->got.offset = ppc64_tlsld_got (gent->owner)->offset; 7616 continue; 7617 } 7618 7619 s = ppc64_elf_tdata (gent->owner)->got; 7620 gent->got.offset = s->size; 7621 s->size 7622 += (gent->tls_type & eh->tls_mask & (TLS_GD | TLS_LD)) ? 16 : 8; 7623 dyn = htab->elf.dynamic_sections_created; 7624 if ((info->shared 7625 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)) 7626 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT 7627 || h->root.type != bfd_link_hash_undefweak)) 7628 ppc64_elf_tdata (gent->owner)->relgot->size 7629 += (gent->tls_type & eh->tls_mask & TLS_GD 7630 ? 2 * sizeof (Elf64_External_Rela) 7631 : sizeof (Elf64_External_Rela)); 7632 } 7633 else 7634 gent->got.offset = (bfd_vma) -1; 7635 7636 if (eh->dyn_relocs == NULL) 7637 return TRUE; 7638 7639 /* In the shared -Bsymbolic case, discard space allocated for 7640 dynamic pc-relative relocs against symbols which turn out to be 7641 defined in regular objects. For the normal shared case, discard 7642 space for relocs that have become local due to symbol visibility 7643 changes. */ 7644 7645 if (info->shared) 7646 { 7647 /* Relocs that use pc_count are those that appear on a call insn, 7648 or certain REL relocs (see MUST_BE_DYN_RELOC) that can be 7649 generated via assembly. We want calls to protected symbols to 7650 resolve directly to the function rather than going via the plt. 7651 If people want function pointer comparisons to work as expected 7652 then they should avoid writing weird assembly. */ 7653 if (SYMBOL_CALLS_LOCAL (info, h)) 7654 { 7655 struct ppc_dyn_relocs **pp; 7656 7657 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) 7658 { 7659 p->count -= p->pc_count; 7660 p->pc_count = 0; 7661 if (p->count == 0) 7662 *pp = p->next; 7663 else 7664 pp = &p->next; 7665 } 7666 } 7667 7668 /* Also discard relocs on undefined weak syms with non-default 7669 visibility. */ 7670 if (eh->dyn_relocs != NULL 7671 && h->root.type == bfd_link_hash_undefweak) 7672 { 7673 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) 7674 eh->dyn_relocs = NULL; 7675 7676 /* Make sure this symbol is output as a dynamic symbol. 7677 Undefined weak syms won't yet be marked as dynamic. */ 7678 else if (h->dynindx == -1 7679 && !h->forced_local) 7680 { 7681 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 7682 return FALSE; 7683 } 7684 } 7685 } 7686 else if (ELIMINATE_COPY_RELOCS) 7687 { 7688 /* For the non-shared case, discard space for relocs against 7689 symbols which turn out to need copy relocs or are not 7690 dynamic. */ 7691 7692 if (!h->non_got_ref 7693 && h->def_dynamic 7694 && !h->def_regular) 7695 { 7696 /* Make sure this symbol is output as a dynamic symbol. 7697 Undefined weak syms won't yet be marked as dynamic. */ 7698 if (h->dynindx == -1 7699 && !h->forced_local) 7700 { 7701 if (! bfd_elf_link_record_dynamic_symbol (info, h)) 7702 return FALSE; 7703 } 7704 7705 /* If that succeeded, we know we'll be keeping all the 7706 relocs. */ 7707 if (h->dynindx != -1) 7708 goto keep; 7709 } 7710 7711 eh->dyn_relocs = NULL; 7712 7713 keep: ; 7714 } 7715 7716 /* Finally, allocate space. */ 7717 for (p = eh->dyn_relocs; p != NULL; p = p->next) 7718 { 7719 asection *sreloc = elf_section_data (p->sec)->sreloc; 7720 sreloc->size += p->count * sizeof (Elf64_External_Rela); 7721 } 7722 7723 return TRUE; 7724} 7725 7726/* Find any dynamic relocs that apply to read-only sections. */ 7727 7728static bfd_boolean 7729readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) 7730{ 7731 struct ppc_link_hash_entry *eh; 7732 struct ppc_dyn_relocs *p; 7733 7734 if (h->root.type == bfd_link_hash_warning) 7735 h = (struct elf_link_hash_entry *) h->root.u.i.link; 7736 7737 eh = (struct ppc_link_hash_entry *) h; 7738 for (p = eh->dyn_relocs; p != NULL; p = p->next) 7739 { 7740 asection *s = p->sec->output_section; 7741 7742 if (s != NULL && (s->flags & SEC_READONLY) != 0) 7743 { 7744 struct bfd_link_info *info = inf; 7745 7746 info->flags |= DF_TEXTREL; 7747 7748 /* Not an error, just cut short the traversal. */ 7749 return FALSE; 7750 } 7751 } 7752 return TRUE; 7753} 7754 7755/* Set the sizes of the dynamic sections. */ 7756 7757static bfd_boolean 7758ppc64_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, 7759 struct bfd_link_info *info) 7760{ 7761 struct ppc_link_hash_table *htab; 7762 bfd *dynobj; 7763 asection *s; 7764 bfd_boolean relocs; 7765 bfd *ibfd; 7766 7767 htab = ppc_hash_table (info); 7768 dynobj = htab->elf.dynobj; 7769 if (dynobj == NULL) 7770 abort (); 7771 7772 if (htab->elf.dynamic_sections_created) 7773 { 7774 /* Set the contents of the .interp section to the interpreter. */ 7775 if (info->executable) 7776 { 7777 s = bfd_get_section_by_name (dynobj, ".interp"); 7778 if (s == NULL) 7779 abort (); 7780 s->size = sizeof ELF_DYNAMIC_INTERPRETER; 7781 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; 7782 } 7783 } 7784 7785 /* Set up .got offsets for local syms, and space for local dynamic 7786 relocs. */ 7787 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 7788 { 7789 struct got_entry **lgot_ents; 7790 struct got_entry **end_lgot_ents; 7791 char *lgot_masks; 7792 bfd_size_type locsymcount; 7793 Elf_Internal_Shdr *symtab_hdr; 7794 asection *srel; 7795 7796 if (!is_ppc64_elf_target (ibfd->xvec)) 7797 continue; 7798 7799 if (ppc64_tlsld_got (ibfd)->refcount > 0) 7800 { 7801 s = ppc64_elf_tdata (ibfd)->got; 7802 ppc64_tlsld_got (ibfd)->offset = s->size; 7803 s->size += 16; 7804 if (info->shared) 7805 { 7806 srel = ppc64_elf_tdata (ibfd)->relgot; 7807 srel->size += sizeof (Elf64_External_Rela); 7808 } 7809 } 7810 else 7811 ppc64_tlsld_got (ibfd)->offset = (bfd_vma) -1; 7812 7813 for (s = ibfd->sections; s != NULL; s = s->next) 7814 { 7815 struct ppc_dyn_relocs *p; 7816 7817 for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next) 7818 { 7819 if (!bfd_is_abs_section (p->sec) 7820 && bfd_is_abs_section (p->sec->output_section)) 7821 { 7822 /* Input section has been discarded, either because 7823 it is a copy of a linkonce section or due to 7824 linker script /DISCARD/, so we'll be discarding 7825 the relocs too. */ 7826 } 7827 else if (p->count != 0) 7828 { 7829 srel = elf_section_data (p->sec)->sreloc; 7830 srel->size += p->count * sizeof (Elf64_External_Rela); 7831 if ((p->sec->output_section->flags & SEC_READONLY) != 0) 7832 info->flags |= DF_TEXTREL; 7833 } 7834 } 7835 } 7836 7837 lgot_ents = elf_local_got_ents (ibfd); 7838 if (!lgot_ents) 7839 continue; 7840 7841 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; 7842 locsymcount = symtab_hdr->sh_info; 7843 end_lgot_ents = lgot_ents + locsymcount; 7844 lgot_masks = (char *) end_lgot_ents; 7845 s = ppc64_elf_tdata (ibfd)->got; 7846 srel = ppc64_elf_tdata (ibfd)->relgot; 7847 for (; lgot_ents < end_lgot_ents; ++lgot_ents, ++lgot_masks) 7848 { 7849 struct got_entry *ent; 7850 7851 for (ent = *lgot_ents; ent != NULL; ent = ent->next) 7852 if (ent->got.refcount > 0) 7853 { 7854 if ((ent->tls_type & *lgot_masks & TLS_LD) != 0) 7855 { 7856 if (ppc64_tlsld_got (ibfd)->offset == (bfd_vma) -1) 7857 { 7858 ppc64_tlsld_got (ibfd)->offset = s->size; 7859 s->size += 16; 7860 if (info->shared) 7861 srel->size += sizeof (Elf64_External_Rela); 7862 } 7863 ent->got.offset = ppc64_tlsld_got (ibfd)->offset; 7864 } 7865 else 7866 { 7867 ent->got.offset = s->size; 7868 if ((ent->tls_type & *lgot_masks & TLS_GD) != 0) 7869 { 7870 s->size += 16; 7871 if (info->shared) 7872 srel->size += 2 * sizeof (Elf64_External_Rela); 7873 } 7874 else 7875 { 7876 s->size += 8; 7877 if (info->shared) 7878 srel->size += sizeof (Elf64_External_Rela); 7879 } 7880 } 7881 } 7882 else 7883 ent->got.offset = (bfd_vma) -1; 7884 } 7885 } 7886 7887 /* Allocate global sym .plt and .got entries, and space for global 7888 sym dynamic relocs. */ 7889 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info); 7890 7891 /* We now have determined the sizes of the various dynamic sections. 7892 Allocate memory for them. */ 7893 relocs = FALSE; 7894 for (s = dynobj->sections; s != NULL; s = s->next) 7895 { 7896 if ((s->flags & SEC_LINKER_CREATED) == 0) 7897 continue; 7898 7899 if (s == htab->brlt || s == htab->relbrlt) 7900 /* These haven't been allocated yet; don't strip. */ 7901 continue; 7902 else if (s == htab->got 7903 || s == htab->plt 7904 || s == htab->glink 7905 || s == htab->dynbss) 7906 { 7907 /* Strip this section if we don't need it; see the 7908 comment below. */ 7909 } 7910 else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) 7911 { 7912 if (s->size != 0) 7913 { 7914 if (s != htab->relplt) 7915 relocs = TRUE; 7916 7917 /* We use the reloc_count field as a counter if we need 7918 to copy relocs into the output file. */ 7919 s->reloc_count = 0; 7920 } 7921 } 7922 else 7923 { 7924 /* It's not one of our sections, so don't allocate space. */ 7925 continue; 7926 } 7927 7928 if (s->size == 0) 7929 { 7930 /* If we don't need this section, strip it from the 7931 output file. This is mostly to handle .rela.bss and 7932 .rela.plt. We must create both sections in 7933 create_dynamic_sections, because they must be created 7934 before the linker maps input sections to output 7935 sections. The linker does that before 7936 adjust_dynamic_symbol is called, and it is that 7937 function which decides whether anything needs to go 7938 into these sections. */ 7939 s->flags |= SEC_EXCLUDE; 7940 continue; 7941 } 7942 7943 if ((s->flags & SEC_HAS_CONTENTS) == 0) 7944 continue; 7945 7946 /* Allocate memory for the section contents. We use bfd_zalloc 7947 here in case unused entries are not reclaimed before the 7948 section's contents are written out. This should not happen, 7949 but this way if it does we get a R_PPC64_NONE reloc in .rela 7950 sections instead of garbage. 7951 We also rely on the section contents being zero when writing 7952 the GOT. */ 7953 s->contents = bfd_zalloc (dynobj, s->size); 7954 if (s->contents == NULL) 7955 return FALSE; 7956 } 7957 7958 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) 7959 { 7960 if (!is_ppc64_elf_target (ibfd->xvec)) 7961 continue; 7962 7963 s = ppc64_elf_tdata (ibfd)->got; 7964 if (s != NULL && s != htab->got) 7965 { 7966 if (s->size == 0) 7967 s->flags |= SEC_EXCLUDE; 7968 else 7969 { 7970 s->contents = bfd_zalloc (ibfd, s->size); 7971 if (s->contents == NULL) 7972 return FALSE; 7973 } 7974 } 7975 s = ppc64_elf_tdata (ibfd)->relgot; 7976 if (s != NULL) 7977 { 7978 if (s->size == 0) 7979 s->flags |= SEC_EXCLUDE; 7980 else 7981 { 7982 s->contents = bfd_zalloc (ibfd, s->size); 7983 if (s->contents == NULL) 7984 return FALSE; 7985 relocs = TRUE; 7986 s->reloc_count = 0; 7987 } 7988 } 7989 } 7990 7991 if (htab->elf.dynamic_sections_created) 7992 { 7993 /* Add some entries to the .dynamic section. We fill in the 7994 values later, in ppc64_elf_finish_dynamic_sections, but we 7995 must add the entries now so that we get the correct size for 7996 the .dynamic section. The DT_DEBUG entry is filled in by the 7997 dynamic linker and used by the debugger. */ 7998#define add_dynamic_entry(TAG, VAL) \ 7999 _bfd_elf_add_dynamic_entry (info, TAG, VAL) 8000 8001 if (info->executable) 8002 { 8003 if (!add_dynamic_entry (DT_DEBUG, 0)) 8004 return FALSE; 8005 } 8006 8007 if (htab->plt != NULL && htab->plt->size != 0) 8008 { 8009 if (!add_dynamic_entry (DT_PLTGOT, 0) 8010 || !add_dynamic_entry (DT_PLTRELSZ, 0) 8011 || !add_dynamic_entry (DT_PLTREL, DT_RELA) 8012 || !add_dynamic_entry (DT_JMPREL, 0) 8013 || !add_dynamic_entry (DT_PPC64_GLINK, 0)) 8014 return FALSE; 8015 } 8016 8017 if (NO_OPD_RELOCS) 8018 { 8019 if (!add_dynamic_entry (DT_PPC64_OPD, 0) 8020 || !add_dynamic_entry (DT_PPC64_OPDSZ, 0)) 8021 return FALSE; 8022 } 8023 8024 if (relocs) 8025 { 8026 if (!add_dynamic_entry (DT_RELA, 0) 8027 || !add_dynamic_entry (DT_RELASZ, 0) 8028 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) 8029 return FALSE; 8030 8031 /* If any dynamic relocs apply to a read-only section, 8032 then we need a DT_TEXTREL entry. */ 8033 if ((info->flags & DF_TEXTREL) == 0) 8034 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info); 8035 8036 if ((info->flags & DF_TEXTREL) != 0) 8037 { 8038 if (!add_dynamic_entry (DT_TEXTREL, 0)) 8039 return FALSE; 8040 } 8041 } 8042 } 8043#undef add_dynamic_entry 8044 8045 return TRUE; 8046} 8047 8048/* Determine the type of stub needed, if any, for a call. */ 8049 8050static inline enum ppc_stub_type 8051ppc_type_of_stub (asection *input_sec, 8052 const Elf_Internal_Rela *rel, 8053 struct ppc_link_hash_entry **hash, 8054 bfd_vma destination) 8055{ 8056 struct ppc_link_hash_entry *h = *hash; 8057 bfd_vma location; 8058 bfd_vma branch_offset; 8059 bfd_vma max_branch_offset; 8060 enum elf_ppc64_reloc_type r_type; 8061 8062 if (h != NULL) 8063 { 8064 struct ppc_link_hash_entry *fdh = h; 8065 if (fdh->oh != NULL 8066 && fdh->oh->is_func_descriptor) 8067 fdh = fdh->oh; 8068 8069 if (fdh->elf.dynindx != -1) 8070 { 8071 struct plt_entry *ent; 8072 8073 for (ent = fdh->elf.plt.plist; ent != NULL; ent = ent->next) 8074 if (ent->addend == rel->r_addend 8075 && ent->plt.offset != (bfd_vma) -1) 8076 { 8077 *hash = fdh; 8078 return ppc_stub_plt_call; 8079 } 8080 } 8081 8082 /* Here, we know we don't have a plt entry. If we don't have a 8083 either a defined function descriptor or a defined entry symbol 8084 in a regular object file, then it is pointless trying to make 8085 any other type of stub. */ 8086 if (!((fdh->elf.root.type == bfd_link_hash_defined 8087 || fdh->elf.root.type == bfd_link_hash_defweak) 8088 && fdh->elf.root.u.def.section->output_section != NULL) 8089 && !((h->elf.root.type == bfd_link_hash_defined 8090 || h->elf.root.type == bfd_link_hash_defweak) 8091 && h->elf.root.u.def.section->output_section != NULL)) 8092 return ppc_stub_none; 8093 } 8094 8095 /* Determine where the call point is. */ 8096 location = (input_sec->output_offset 8097 + input_sec->output_section->vma 8098 + rel->r_offset); 8099 8100 branch_offset = destination - location; 8101 r_type = ELF64_R_TYPE (rel->r_info); 8102 8103 /* Determine if a long branch stub is needed. */ 8104 max_branch_offset = 1 << 25; 8105 if (r_type != R_PPC64_REL24) 8106 max_branch_offset = 1 << 15; 8107 8108 if (branch_offset + max_branch_offset >= 2 * max_branch_offset) 8109 /* We need a stub. Figure out whether a long_branch or plt_branch 8110 is needed later. */ 8111 return ppc_stub_long_branch; 8112 8113 return ppc_stub_none; 8114} 8115 8116/* Build a .plt call stub. */ 8117 8118static inline bfd_byte * 8119build_plt_stub (bfd *obfd, bfd_byte *p, int offset) 8120{ 8121#define PPC_LO(v) ((v) & 0xffff) 8122#define PPC_HI(v) (((v) >> 16) & 0xffff) 8123#define PPC_HA(v) PPC_HI ((v) + 0x8000) 8124 8125 bfd_put_32 (obfd, ADDIS_R12_R2 | PPC_HA (offset), p), p += 4; 8126 bfd_put_32 (obfd, STD_R2_40R1, p), p += 4; 8127 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4; 8128 if (PPC_HA (offset + 8) != PPC_HA (offset)) 8129 bfd_put_32 (obfd, ADDIS_R12_R12 | 1, p), p += 4; 8130 offset += 8; 8131 bfd_put_32 (obfd, LD_R2_0R12 | PPC_LO (offset), p), p += 4; 8132 if (PPC_HA (offset + 8) != PPC_HA (offset)) 8133 bfd_put_32 (obfd, ADDIS_R12_R12 | 1, p), p += 4; 8134 offset += 8; 8135 bfd_put_32 (obfd, MTCTR_R11, p), p += 4; 8136 bfd_put_32 (obfd, LD_R11_0R12 | PPC_LO (offset), p), p += 4; 8137 bfd_put_32 (obfd, BCTR, p), p += 4; 8138 return p; 8139} 8140 8141static bfd_boolean 8142ppc_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) 8143{ 8144 struct ppc_stub_hash_entry *stub_entry; 8145 struct ppc_branch_hash_entry *br_entry; 8146 struct bfd_link_info *info; 8147 struct ppc_link_hash_table *htab; 8148 bfd_byte *loc; 8149 bfd_byte *p; 8150 unsigned int indx; 8151 struct plt_entry *ent; 8152 bfd_vma dest, off; 8153 int size; 8154 8155 /* Massage our args to the form they really have. */ 8156 stub_entry = (struct ppc_stub_hash_entry *) gen_entry; 8157 info = in_arg; 8158 8159 htab = ppc_hash_table (info); 8160 8161 /* Make a note of the offset within the stubs for this entry. */ 8162 stub_entry->stub_offset = stub_entry->stub_sec->size; 8163 loc = stub_entry->stub_sec->contents + stub_entry->stub_offset; 8164 8165 htab->stub_count[stub_entry->stub_type - 1] += 1; 8166 switch (stub_entry->stub_type) 8167 { 8168 case ppc_stub_long_branch: 8169 case ppc_stub_long_branch_r2off: 8170 /* Branches are relative. This is where we are going to. */ 8171 off = dest = (stub_entry->target_value 8172 + stub_entry->target_section->output_offset 8173 + stub_entry->target_section->output_section->vma); 8174 8175 /* And this is where we are coming from. */ 8176 off -= (stub_entry->stub_offset 8177 + stub_entry->stub_sec->output_offset 8178 + stub_entry->stub_sec->output_section->vma); 8179 8180 if (stub_entry->stub_type != ppc_stub_long_branch_r2off) 8181 size = 4; 8182 else 8183 { 8184 bfd_vma r2off; 8185 8186 r2off = (htab->stub_group[stub_entry->target_section->id].toc_off 8187 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8188 bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc); 8189 loc += 4; 8190 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc); 8191 loc += 4; 8192 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc); 8193 loc += 4; 8194 off -= 12; 8195 size = 16; 8196 } 8197 bfd_put_32 (htab->stub_bfd, B_DOT | (off & 0x3fffffc), loc); 8198 8199 if (off + (1 << 25) >= (bfd_vma) (1 << 26)) 8200 { 8201 (*_bfd_error_handler) (_("long branch stub `%s' offset overflow"), 8202 stub_entry->root.string); 8203 htab->stub_error = TRUE; 8204 return FALSE; 8205 } 8206 8207 if (info->emitrelocations) 8208 { 8209 Elf_Internal_Rela *relocs, *r; 8210 struct bfd_elf_section_data *elfsec_data; 8211 8212 elfsec_data = elf_section_data (stub_entry->stub_sec); 8213 relocs = elfsec_data->relocs; 8214 if (relocs == NULL) 8215 { 8216 bfd_size_type relsize; 8217 relsize = stub_entry->stub_sec->reloc_count * sizeof (*relocs); 8218 relocs = bfd_alloc (htab->stub_bfd, relsize); 8219 if (relocs == NULL) 8220 return FALSE; 8221 elfsec_data->relocs = relocs; 8222 elfsec_data->rel_hdr.sh_size = relsize; 8223 elfsec_data->rel_hdr.sh_entsize = 24; 8224 stub_entry->stub_sec->reloc_count = 0; 8225 } 8226 r = relocs + stub_entry->stub_sec->reloc_count; 8227 stub_entry->stub_sec->reloc_count += 1; 8228 r->r_offset = loc - stub_entry->stub_sec->contents; 8229 r->r_info = ELF64_R_INFO (0, R_PPC64_REL24); 8230 r->r_addend = dest; 8231 if (stub_entry->h != NULL) 8232 { 8233 struct elf_link_hash_entry **hashes; 8234 unsigned long symndx; 8235 struct ppc_link_hash_entry *h; 8236 8237 hashes = elf_sym_hashes (htab->stub_bfd); 8238 if (hashes == NULL) 8239 { 8240 bfd_size_type hsize; 8241 8242 hsize = (htab->stub_globals + 1) * sizeof (*hashes); 8243 hashes = bfd_zalloc (htab->stub_bfd, hsize); 8244 if (hashes == NULL) 8245 return FALSE; 8246 elf_sym_hashes (htab->stub_bfd) = hashes; 8247 htab->stub_globals = 1; 8248 } 8249 symndx = htab->stub_globals++; 8250 h = stub_entry->h; 8251 hashes[symndx] = &h->elf; 8252 r->r_info = ELF64_R_INFO (symndx, R_PPC64_REL24); 8253 if (h->oh != NULL && h->oh->is_func) 8254 h = h->oh; 8255 if (h->elf.root.u.def.section != stub_entry->target_section) 8256 /* H is an opd symbol. The addend must be zero. */ 8257 r->r_addend = 0; 8258 else 8259 { 8260 off = (h->elf.root.u.def.value 8261 + h->elf.root.u.def.section->output_offset 8262 + h->elf.root.u.def.section->output_section->vma); 8263 r->r_addend -= off; 8264 } 8265 } 8266 } 8267 break; 8268 8269 case ppc_stub_plt_branch: 8270 case ppc_stub_plt_branch_r2off: 8271 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table, 8272 stub_entry->root.string + 9, 8273 FALSE, FALSE); 8274 if (br_entry == NULL) 8275 { 8276 (*_bfd_error_handler) (_("can't find branch stub `%s'"), 8277 stub_entry->root.string); 8278 htab->stub_error = TRUE; 8279 return FALSE; 8280 } 8281 8282 off = (stub_entry->target_value 8283 + stub_entry->target_section->output_offset 8284 + stub_entry->target_section->output_section->vma); 8285 8286 bfd_put_64 (htab->brlt->owner, off, 8287 htab->brlt->contents + br_entry->offset); 8288 8289 if (htab->relbrlt != NULL) 8290 { 8291 /* Create a reloc for the branch lookup table entry. */ 8292 Elf_Internal_Rela rela; 8293 bfd_byte *rl; 8294 8295 rela.r_offset = (br_entry->offset 8296 + htab->brlt->output_offset 8297 + htab->brlt->output_section->vma); 8298 rela.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); 8299 rela.r_addend = off; 8300 8301 rl = htab->relbrlt->contents; 8302 rl += htab->relbrlt->reloc_count++ * sizeof (Elf64_External_Rela); 8303 bfd_elf64_swap_reloca_out (htab->relbrlt->owner, &rela, rl); 8304 } 8305 8306 off = (br_entry->offset 8307 + htab->brlt->output_offset 8308 + htab->brlt->output_section->vma 8309 - elf_gp (htab->brlt->output_section->owner) 8310 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8311 8312 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0) 8313 { 8314 (*_bfd_error_handler) 8315 (_("linkage table error against `%s'"), 8316 stub_entry->root.string); 8317 bfd_set_error (bfd_error_bad_value); 8318 htab->stub_error = TRUE; 8319 return FALSE; 8320 } 8321 8322 indx = off; 8323 if (stub_entry->stub_type != ppc_stub_plt_branch_r2off) 8324 { 8325 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (indx), loc); 8326 loc += 4; 8327 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (indx), loc); 8328 size = 16; 8329 } 8330 else 8331 { 8332 bfd_vma r2off; 8333 8334 r2off = (htab->stub_group[stub_entry->target_section->id].toc_off 8335 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8336 bfd_put_32 (htab->stub_bfd, STD_R2_40R1, loc); 8337 loc += 4; 8338 bfd_put_32 (htab->stub_bfd, ADDIS_R12_R2 | PPC_HA (indx), loc); 8339 loc += 4; 8340 bfd_put_32 (htab->stub_bfd, LD_R11_0R12 | PPC_LO (indx), loc); 8341 loc += 4; 8342 bfd_put_32 (htab->stub_bfd, ADDIS_R2_R2 | PPC_HA (r2off), loc); 8343 loc += 4; 8344 bfd_put_32 (htab->stub_bfd, ADDI_R2_R2 | PPC_LO (r2off), loc); 8345 size = 28; 8346 } 8347 loc += 4; 8348 bfd_put_32 (htab->stub_bfd, MTCTR_R11, loc); 8349 loc += 4; 8350 bfd_put_32 (htab->stub_bfd, BCTR, loc); 8351 break; 8352 8353 case ppc_stub_plt_call: 8354 /* Do the best we can for shared libraries built without 8355 exporting ".foo" for each "foo". This can happen when symbol 8356 versioning scripts strip all bar a subset of symbols. */ 8357 if (stub_entry->h->oh != NULL 8358 && stub_entry->h->oh->elf.root.type != bfd_link_hash_defined 8359 && stub_entry->h->oh->elf.root.type != bfd_link_hash_defweak) 8360 { 8361 /* Point the symbol at the stub. There may be multiple stubs, 8362 we don't really care; The main thing is to make this sym 8363 defined somewhere. Maybe defining the symbol in the stub 8364 section is a silly idea. If we didn't do this, htab->top_id 8365 could disappear. */ 8366 stub_entry->h->oh->elf.root.type = bfd_link_hash_defined; 8367 stub_entry->h->oh->elf.root.u.def.section = stub_entry->stub_sec; 8368 stub_entry->h->oh->elf.root.u.def.value = stub_entry->stub_offset; 8369 } 8370 8371 /* Now build the stub. */ 8372 off = (bfd_vma) -1; 8373 for (ent = stub_entry->h->elf.plt.plist; ent != NULL; ent = ent->next) 8374 if (ent->addend == stub_entry->addend) 8375 { 8376 off = ent->plt.offset; 8377 break; 8378 } 8379 if (off >= (bfd_vma) -2) 8380 abort (); 8381 8382 off &= ~ (bfd_vma) 1; 8383 off += (htab->plt->output_offset 8384 + htab->plt->output_section->vma 8385 - elf_gp (htab->plt->output_section->owner) 8386 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8387 8388 if (off + 0x80008000 > 0xffffffff || (off & 7) != 0) 8389 { 8390 (*_bfd_error_handler) 8391 (_("linkage table error against `%s'"), 8392 stub_entry->h->elf.root.root.string); 8393 bfd_set_error (bfd_error_bad_value); 8394 htab->stub_error = TRUE; 8395 return FALSE; 8396 } 8397 8398 p = build_plt_stub (htab->stub_bfd, loc, off); 8399 size = p - loc; 8400 break; 8401 8402 default: 8403 BFD_FAIL (); 8404 return FALSE; 8405 } 8406 8407 stub_entry->stub_sec->size += size; 8408 8409 if (htab->emit_stub_syms) 8410 { 8411 struct elf_link_hash_entry *h; 8412 size_t len1, len2; 8413 char *name; 8414 const char *const stub_str[] = { "long_branch", 8415 "long_branch_r2off", 8416 "plt_branch", 8417 "plt_branch_r2off", 8418 "plt_call" }; 8419 8420 len1 = strlen (stub_str[stub_entry->stub_type - 1]); 8421 len2 = strlen (stub_entry->root.string); 8422 name = bfd_malloc (len1 + len2 + 2); 8423 if (name == NULL) 8424 return FALSE; 8425 memcpy (name, stub_entry->root.string, 9); 8426 memcpy (name + 9, stub_str[stub_entry->stub_type - 1], len1); 8427 memcpy (name + len1 + 9, stub_entry->root.string + 8, len2 - 8 + 1); 8428 h = elf_link_hash_lookup (&htab->elf, name, TRUE, FALSE, FALSE); 8429 if (h == NULL) 8430 return FALSE; 8431 if (h->root.type == bfd_link_hash_new) 8432 { 8433 h->root.type = bfd_link_hash_defined; 8434 h->root.u.def.section = stub_entry->stub_sec; 8435 h->root.u.def.value = stub_entry->stub_offset; 8436 h->ref_regular = 1; 8437 h->def_regular = 1; 8438 h->ref_regular_nonweak = 1; 8439 h->forced_local = 1; 8440 h->non_elf = 0; 8441 } 8442 } 8443 8444 return TRUE; 8445} 8446 8447/* As above, but don't actually build the stub. Just bump offset so 8448 we know stub section sizes, and select plt_branch stubs where 8449 long_branch stubs won't do. */ 8450 8451static bfd_boolean 8452ppc_size_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) 8453{ 8454 struct ppc_stub_hash_entry *stub_entry; 8455 struct bfd_link_info *info; 8456 struct ppc_link_hash_table *htab; 8457 bfd_vma off; 8458 int size; 8459 8460 /* Massage our args to the form they really have. */ 8461 stub_entry = (struct ppc_stub_hash_entry *) gen_entry; 8462 info = in_arg; 8463 8464 htab = ppc_hash_table (info); 8465 8466 if (stub_entry->stub_type == ppc_stub_plt_call) 8467 { 8468 struct plt_entry *ent; 8469 off = (bfd_vma) -1; 8470 for (ent = stub_entry->h->elf.plt.plist; ent != NULL; ent = ent->next) 8471 if (ent->addend == stub_entry->addend) 8472 { 8473 off = ent->plt.offset & ~(bfd_vma) 1; 8474 break; 8475 } 8476 if (off >= (bfd_vma) -2) 8477 abort (); 8478 off += (htab->plt->output_offset 8479 + htab->plt->output_section->vma 8480 - elf_gp (htab->plt->output_section->owner) 8481 - htab->stub_group[stub_entry->id_sec->id].toc_off); 8482 8483 size = PLT_CALL_STUB_SIZE; 8484 if (PPC_HA (off + 16) != PPC_HA (off)) 8485 size += 4; 8486 } 8487 else 8488 { 8489 /* ppc_stub_long_branch or ppc_stub_plt_branch, or their r2off 8490 variants. */ 8491 off = (stub_entry->target_value 8492 + stub_entry->target_section->output_offset 8493 + stub_entry->target_section->output_section->vma); 8494 off -= (stub_entry->stub_sec->size 8495 + stub_entry->stub_sec->output_offset 8496 + stub_entry->stub_sec->output_section->vma); 8497 8498 /* Reset the stub type from the plt variant in case we now 8499 can reach with a shorter stub. */ 8500 if (stub_entry->stub_type >= ppc_stub_plt_branch) 8501 stub_entry->stub_type += ppc_stub_long_branch - ppc_stub_plt_branch; 8502 8503 size = 4; 8504 if (stub_entry->stub_type == ppc_stub_long_branch_r2off) 8505 { 8506 off -= 12; 8507 size = 16; 8508 } 8509 8510 /* If the branch offset if too big, use a ppc_stub_plt_branch. */ 8511 if (off + (1 << 25) >= (bfd_vma) (1 << 26)) 8512 { 8513 struct ppc_branch_hash_entry *br_entry; 8514 8515 br_entry = ppc_branch_hash_lookup (&htab->branch_hash_table, 8516 stub_entry->root.string + 9, 8517 TRUE, FALSE); 8518 if (br_entry == NULL) 8519 { 8520 (*_bfd_error_handler) (_("can't build branch stub `%s'"), 8521 stub_entry->root.string); 8522 htab->stub_error = TRUE; 8523 return FALSE; 8524 } 8525 8526 if (br_entry->iter != htab->stub_iteration) 8527 { 8528 br_entry->iter = htab->stub_iteration; 8529 br_entry->offset = htab->brlt->size; 8530 htab->brlt->size += 8; 8531 8532 if (htab->relbrlt != NULL) 8533 htab->relbrlt->size += sizeof (Elf64_External_Rela); 8534 } 8535 8536 stub_entry->stub_type += ppc_stub_plt_branch - ppc_stub_long_branch; 8537 size = 16; 8538 if (stub_entry->stub_type != ppc_stub_plt_branch) 8539 size = 28; 8540 } 8541 8542 if (info->emitrelocations 8543 && (stub_entry->stub_type == ppc_stub_long_branch 8544 || stub_entry->stub_type == ppc_stub_long_branch_r2off)) 8545 stub_entry->stub_sec->reloc_count += 1; 8546 } 8547 8548 stub_entry->stub_sec->size += size; 8549 return TRUE; 8550} 8551 8552/* Set up various things so that we can make a list of input sections 8553 for each output section included in the link. Returns -1 on error, 8554 0 when no stubs will be needed, and 1 on success. */ 8555 8556int 8557ppc64_elf_setup_section_lists (bfd *output_bfd, 8558 struct bfd_link_info *info, 8559 int no_multi_toc) 8560{ 8561 bfd *input_bfd; 8562 int top_id, top_index, id; 8563 asection *section; 8564 asection **input_list; 8565 bfd_size_type amt; 8566 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8567 8568 htab->no_multi_toc = no_multi_toc; 8569 8570 if (htab->brlt == NULL) 8571 return 0; 8572 8573 /* Find the top input section id. */ 8574 for (input_bfd = info->input_bfds, top_id = 3; 8575 input_bfd != NULL; 8576 input_bfd = input_bfd->link_next) 8577 { 8578 for (section = input_bfd->sections; 8579 section != NULL; 8580 section = section->next) 8581 { 8582 if (top_id < section->id) 8583 top_id = section->id; 8584 } 8585 } 8586 8587 htab->top_id = top_id; 8588 amt = sizeof (struct map_stub) * (top_id + 1); 8589 htab->stub_group = bfd_zmalloc (amt); 8590 if (htab->stub_group == NULL) 8591 return -1; 8592 8593 /* Set toc_off for com, und, abs and ind sections. */ 8594 for (id = 0; id < 3; id++) 8595 htab->stub_group[id].toc_off = TOC_BASE_OFF; 8596 8597 elf_gp (output_bfd) = htab->toc_curr = ppc64_elf_toc (output_bfd); 8598 8599 /* We can't use output_bfd->section_count here to find the top output 8600 section index as some sections may have been removed, and 8601 strip_excluded_output_sections doesn't renumber the indices. */ 8602 for (section = output_bfd->sections, top_index = 0; 8603 section != NULL; 8604 section = section->next) 8605 { 8606 if (top_index < section->index) 8607 top_index = section->index; 8608 } 8609 8610 htab->top_index = top_index; 8611 amt = sizeof (asection *) * (top_index + 1); 8612 input_list = bfd_zmalloc (amt); 8613 htab->input_list = input_list; 8614 if (input_list == NULL) 8615 return -1; 8616 8617 return 1; 8618} 8619 8620/* The linker repeatedly calls this function for each TOC input section 8621 and linker generated GOT section. Group input bfds such that the toc 8622 within a group is less than 64k in size. Will break with cute linker 8623 scripts that play games with dot in the output toc section. */ 8624 8625void 8626ppc64_elf_next_toc_section (struct bfd_link_info *info, asection *isec) 8627{ 8628 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8629 8630 if (!htab->no_multi_toc) 8631 { 8632 bfd_vma addr = isec->output_offset + isec->output_section->vma; 8633 bfd_vma off = addr - htab->toc_curr; 8634 8635 if (off + isec->size > 0x10000) 8636 htab->toc_curr = addr; 8637 8638 elf_gp (isec->owner) = (htab->toc_curr 8639 - elf_gp (isec->output_section->owner) 8640 + TOC_BASE_OFF); 8641 } 8642} 8643 8644/* Called after the last call to the above function. */ 8645 8646void 8647ppc64_elf_reinit_toc (bfd *output_bfd, struct bfd_link_info *info) 8648{ 8649 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8650 8651 htab->multi_toc_needed = htab->toc_curr != elf_gp (output_bfd); 8652 8653 /* toc_curr tracks the TOC offset used for code sections below in 8654 ppc64_elf_next_input_section. Start off at 0x8000. */ 8655 htab->toc_curr = TOC_BASE_OFF; 8656} 8657 8658/* No toc references were found in ISEC. If the code in ISEC makes no 8659 calls, then there's no need to use toc adjusting stubs when branching 8660 into ISEC. Actually, indirect calls from ISEC are OK as they will 8661 load r2. Returns -1 on error, 0 for no stub needed, 1 for stub 8662 needed, and 2 if a cyclical call-graph was found but no other reason 8663 for a stub was detected. If called from the top level, a return of 8664 2 means the same as a return of 0. */ 8665 8666static int 8667toc_adjusting_stub_needed (struct bfd_link_info *info, asection *isec) 8668{ 8669 Elf_Internal_Rela *relstart, *rel; 8670 Elf_Internal_Sym *local_syms; 8671 int ret; 8672 struct ppc_link_hash_table *htab; 8673 8674 /* We know none of our code bearing sections will need toc stubs. */ 8675 if ((isec->flags & SEC_LINKER_CREATED) != 0) 8676 return 0; 8677 8678 if (isec->size == 0) 8679 return 0; 8680 8681 if (isec->output_section == NULL) 8682 return 0; 8683 8684 /* Hack for linux kernel. .fixup contains branches, but only back to 8685 the function that hit an exception. */ 8686 if (strcmp (isec->name, ".fixup") == 0) 8687 return 0; 8688 8689 if (isec->reloc_count == 0) 8690 return 0; 8691 8692 relstart = _bfd_elf_link_read_relocs (isec->owner, isec, NULL, NULL, 8693 info->keep_memory); 8694 if (relstart == NULL) 8695 return -1; 8696 8697 /* Look for branches to outside of this section. */ 8698 local_syms = NULL; 8699 ret = 0; 8700 htab = ppc_hash_table (info); 8701 for (rel = relstart; rel < relstart + isec->reloc_count; ++rel) 8702 { 8703 enum elf_ppc64_reloc_type r_type; 8704 unsigned long r_symndx; 8705 struct elf_link_hash_entry *h; 8706 Elf_Internal_Sym *sym; 8707 asection *sym_sec; 8708 long *opd_adjust; 8709 bfd_vma sym_value; 8710 bfd_vma dest; 8711 8712 r_type = ELF64_R_TYPE (rel->r_info); 8713 if (r_type != R_PPC64_REL24 8714 && r_type != R_PPC64_REL14 8715 && r_type != R_PPC64_REL14_BRTAKEN 8716 && r_type != R_PPC64_REL14_BRNTAKEN) 8717 continue; 8718 8719 r_symndx = ELF64_R_SYM (rel->r_info); 8720 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, r_symndx, 8721 isec->owner)) 8722 { 8723 ret = -1; 8724 break; 8725 } 8726 8727 /* Calls to dynamic lib functions go through a plt call stub 8728 that uses r2. Branches to undefined symbols might be a call 8729 using old-style dot symbols that can be satisfied by a plt 8730 call into a new-style dynamic library. */ 8731 if (sym_sec == NULL) 8732 { 8733 struct ppc_link_hash_entry *eh = (struct ppc_link_hash_entry *) h; 8734 if (eh != NULL 8735 && eh->oh != NULL 8736 && eh->oh->elf.plt.plist != NULL) 8737 { 8738 ret = 1; 8739 break; 8740 } 8741 8742 /* Ignore other undefined symbols. */ 8743 continue; 8744 } 8745 8746 /* Assume branches to other sections not included in the link need 8747 stubs too, to cover -R and absolute syms. */ 8748 if (sym_sec->output_section == NULL) 8749 { 8750 ret = 1; 8751 break; 8752 } 8753 8754 if (h == NULL) 8755 sym_value = sym->st_value; 8756 else 8757 { 8758 if (h->root.type != bfd_link_hash_defined 8759 && h->root.type != bfd_link_hash_defweak) 8760 abort (); 8761 sym_value = h->root.u.def.value; 8762 } 8763 sym_value += rel->r_addend; 8764 8765 /* If this branch reloc uses an opd sym, find the code section. */ 8766 opd_adjust = get_opd_info (sym_sec); 8767 if (opd_adjust != NULL) 8768 { 8769 if (h == NULL) 8770 { 8771 long adjust; 8772 8773 adjust = opd_adjust[sym->st_value / 8]; 8774 if (adjust == -1) 8775 /* Assume deleted functions won't ever be called. */ 8776 continue; 8777 sym_value += adjust; 8778 } 8779 8780 dest = opd_entry_value (sym_sec, sym_value, &sym_sec, NULL); 8781 if (dest == (bfd_vma) -1) 8782 continue; 8783 } 8784 else 8785 dest = (sym_value 8786 + sym_sec->output_offset 8787 + sym_sec->output_section->vma); 8788 8789 /* Ignore branch to self. */ 8790 if (sym_sec == isec) 8791 continue; 8792 8793 /* If the called function uses the toc, we need a stub. */ 8794 if (sym_sec->has_toc_reloc 8795 || sym_sec->makes_toc_func_call) 8796 { 8797 ret = 1; 8798 break; 8799 } 8800 8801 /* Assume any branch that needs a long branch stub might in fact 8802 need a plt_branch stub. A plt_branch stub uses r2. */ 8803 else if (dest - (isec->output_offset 8804 + isec->output_section->vma 8805 + rel->r_offset) + (1 << 25) >= (2 << 25)) 8806 { 8807 ret = 1; 8808 break; 8809 } 8810 8811 /* If calling back to a section in the process of being tested, we 8812 can't say for sure that no toc adjusting stubs are needed, so 8813 don't return zero. */ 8814 else if (sym_sec->call_check_in_progress) 8815 ret = 2; 8816 8817 /* Branches to another section that itself doesn't have any TOC 8818 references are OK. Recursively call ourselves to check. */ 8819 else if (sym_sec->id <= htab->top_id 8820 && htab->stub_group[sym_sec->id].toc_off == 0) 8821 { 8822 int recur; 8823 8824 /* Mark current section as indeterminate, so that other 8825 sections that call back to current won't be marked as 8826 known. */ 8827 isec->call_check_in_progress = 1; 8828 recur = toc_adjusting_stub_needed (info, sym_sec); 8829 isec->call_check_in_progress = 0; 8830 8831 if (recur < 0) 8832 { 8833 /* An error. Exit. */ 8834 ret = -1; 8835 break; 8836 } 8837 else if (recur <= 1) 8838 { 8839 /* Known result. Mark as checked and set section flag. */ 8840 htab->stub_group[sym_sec->id].toc_off = 1; 8841 if (recur != 0) 8842 { 8843 sym_sec->makes_toc_func_call = 1; 8844 ret = 1; 8845 break; 8846 } 8847 } 8848 else 8849 { 8850 /* Unknown result. Continue checking. */ 8851 ret = 2; 8852 } 8853 } 8854 } 8855 8856 if (local_syms != NULL 8857 && (elf_tdata (isec->owner)->symtab_hdr.contents 8858 != (unsigned char *) local_syms)) 8859 free (local_syms); 8860 if (elf_section_data (isec)->relocs != relstart) 8861 free (relstart); 8862 8863 return ret; 8864} 8865 8866/* The linker repeatedly calls this function for each input section, 8867 in the order that input sections are linked into output sections. 8868 Build lists of input sections to determine groupings between which 8869 we may insert linker stubs. */ 8870 8871bfd_boolean 8872ppc64_elf_next_input_section (struct bfd_link_info *info, asection *isec) 8873{ 8874 struct ppc_link_hash_table *htab = ppc_hash_table (info); 8875 8876 if ((isec->output_section->flags & SEC_CODE) != 0 8877 && isec->output_section->index <= htab->top_index) 8878 { 8879 asection **list = htab->input_list + isec->output_section->index; 8880 /* Steal the link_sec pointer for our list. */ 8881#define PREV_SEC(sec) (htab->stub_group[(sec)->id].link_sec) 8882 /* This happens to make the list in reverse order, 8883 which is what we want. */ 8884 PREV_SEC (isec) = *list; 8885 *list = isec; 8886 } 8887 8888 if (htab->multi_toc_needed) 8889 { 8890 /* If a code section has a function that uses the TOC then we need 8891 to use the right TOC (obviously). Also, make sure that .opd gets 8892 the correct TOC value for R_PPC64_TOC relocs that don't have or 8893 can't find their function symbol (shouldn't ever happen now). */ 8894 if (isec->has_toc_reloc || (isec->flags & SEC_CODE) == 0) 8895 { 8896 if (elf_gp (isec->owner) != 0) 8897 htab->toc_curr = elf_gp (isec->owner); 8898 } 8899 else if (htab->stub_group[isec->id].toc_off == 0) 8900 { 8901 int ret = toc_adjusting_stub_needed (info, isec); 8902 if (ret < 0) 8903 return FALSE; 8904 else 8905 isec->makes_toc_func_call = ret & 1; 8906 } 8907 } 8908 8909 /* Functions that don't use the TOC can belong in any TOC group. 8910 Use the last TOC base. This happens to make _init and _fini 8911 pasting work. */ 8912 htab->stub_group[isec->id].toc_off = htab->toc_curr; 8913 return TRUE; 8914} 8915 8916/* See whether we can group stub sections together. Grouping stub 8917 sections may result in fewer stubs. More importantly, we need to 8918 put all .init* and .fini* stubs at the beginning of the .init or 8919 .fini output sections respectively, because glibc splits the 8920 _init and _fini functions into multiple parts. Putting a stub in 8921 the middle of a function is not a good idea. */ 8922 8923static void 8924group_sections (struct ppc_link_hash_table *htab, 8925 bfd_size_type stub_group_size, 8926 bfd_boolean stubs_always_before_branch) 8927{ 8928 asection **list = htab->input_list + htab->top_index; 8929 do 8930 { 8931 asection *tail = *list; 8932 while (tail != NULL) 8933 { 8934 asection *curr; 8935 asection *prev; 8936 bfd_size_type total; 8937 bfd_boolean big_sec; 8938 bfd_vma curr_toc; 8939 8940 curr = tail; 8941 total = tail->size; 8942 big_sec = total > stub_group_size; 8943 if (big_sec) 8944 (*_bfd_error_handler) (_("%B section %A exceeds stub group size"), 8945 tail->owner, tail); 8946 curr_toc = htab->stub_group[tail->id].toc_off; 8947 8948 while ((prev = PREV_SEC (curr)) != NULL 8949 && ((total += curr->output_offset - prev->output_offset) 8950 < stub_group_size) 8951 && htab->stub_group[prev->id].toc_off == curr_toc) 8952 curr = prev; 8953 8954 /* OK, the size from the start of CURR to the end is less 8955 than stub_group_size and thus can be handled by one stub 8956 section. (or the tail section is itself larger than 8957 stub_group_size, in which case we may be toast.) We 8958 should really be keeping track of the total size of stubs 8959 added here, as stubs contribute to the final output 8960 section size. That's a little tricky, and this way will 8961 only break if stubs added make the total size more than 8962 2^25, ie. for the default stub_group_size, if stubs total 8963 more than 2097152 bytes, or nearly 75000 plt call stubs. */ 8964 do 8965 { 8966 prev = PREV_SEC (tail); 8967 /* Set up this stub group. */ 8968 htab->stub_group[tail->id].link_sec = curr; 8969 } 8970 while (tail != curr && (tail = prev) != NULL); 8971 8972 /* But wait, there's more! Input sections up to stub_group_size 8973 bytes before the stub section can be handled by it too. 8974 Don't do this if we have a really large section after the 8975 stubs, as adding more stubs increases the chance that 8976 branches may not reach into the stub section. */ 8977 if (!stubs_always_before_branch && !big_sec) 8978 { 8979 total = 0; 8980 while (prev != NULL 8981 && ((total += tail->output_offset - prev->output_offset) 8982 < stub_group_size) 8983 && htab->stub_group[prev->id].toc_off == curr_toc) 8984 { 8985 tail = prev; 8986 prev = PREV_SEC (tail); 8987 htab->stub_group[tail->id].link_sec = curr; 8988 } 8989 } 8990 tail = prev; 8991 } 8992 } 8993 while (list-- != htab->input_list); 8994 free (htab->input_list); 8995#undef PREV_SEC 8996} 8997 8998/* Determine and set the size of the stub section for a final link. 8999 9000 The basic idea here is to examine all the relocations looking for 9001 PC-relative calls to a target that is unreachable with a "bl" 9002 instruction. */ 9003 9004bfd_boolean 9005ppc64_elf_size_stubs (bfd *output_bfd, 9006 struct bfd_link_info *info, 9007 bfd_signed_vma group_size, 9008 asection *(*add_stub_section) (const char *, asection *), 9009 void (*layout_sections_again) (void)) 9010{ 9011 bfd_size_type stub_group_size; 9012 bfd_boolean stubs_always_before_branch; 9013 struct ppc_link_hash_table *htab = ppc_hash_table (info); 9014 9015 /* Stash our params away. */ 9016 htab->add_stub_section = add_stub_section; 9017 htab->layout_sections_again = layout_sections_again; 9018 stubs_always_before_branch = group_size < 0; 9019 if (group_size < 0) 9020 stub_group_size = -group_size; 9021 else 9022 stub_group_size = group_size; 9023 if (stub_group_size == 1) 9024 { 9025 /* Default values. */ 9026 if (stubs_always_before_branch) 9027 { 9028 stub_group_size = 0x1e00000; 9029 if (htab->has_14bit_branch) 9030 stub_group_size = 0x7800; 9031 } 9032 else 9033 { 9034 stub_group_size = 0x1c00000; 9035 if (htab->has_14bit_branch) 9036 stub_group_size = 0x7000; 9037 } 9038 } 9039 9040 group_sections (htab, stub_group_size, stubs_always_before_branch); 9041 9042 while (1) 9043 { 9044 bfd *input_bfd; 9045 unsigned int bfd_indx; 9046 asection *stub_sec; 9047 9048 htab->stub_iteration += 1; 9049 9050 for (input_bfd = info->input_bfds, bfd_indx = 0; 9051 input_bfd != NULL; 9052 input_bfd = input_bfd->link_next, bfd_indx++) 9053 { 9054 Elf_Internal_Shdr *symtab_hdr; 9055 asection *section; 9056 Elf_Internal_Sym *local_syms = NULL; 9057 9058 if (!is_ppc64_elf_target (input_bfd->xvec)) 9059 continue; 9060 9061 /* We'll need the symbol table in a second. */ 9062 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 9063 if (symtab_hdr->sh_info == 0) 9064 continue; 9065 9066 /* Walk over each section attached to the input bfd. */ 9067 for (section = input_bfd->sections; 9068 section != NULL; 9069 section = section->next) 9070 { 9071 Elf_Internal_Rela *internal_relocs, *irelaend, *irela; 9072 9073 /* If there aren't any relocs, then there's nothing more 9074 to do. */ 9075 if ((section->flags & SEC_RELOC) == 0 9076 || section->reloc_count == 0) 9077 continue; 9078 9079 /* If this section is a link-once section that will be 9080 discarded, then don't create any stubs. */ 9081 if (section->output_section == NULL 9082 || section->output_section->owner != output_bfd) 9083 continue; 9084 9085 /* Get the relocs. */ 9086 internal_relocs 9087 = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL, 9088 info->keep_memory); 9089 if (internal_relocs == NULL) 9090 goto error_ret_free_local; 9091 9092 /* Now examine each relocation. */ 9093 irela = internal_relocs; 9094 irelaend = irela + section->reloc_count; 9095 for (; irela < irelaend; irela++) 9096 { 9097 enum elf_ppc64_reloc_type r_type; 9098 unsigned int r_indx; 9099 enum ppc_stub_type stub_type; 9100 struct ppc_stub_hash_entry *stub_entry; 9101 asection *sym_sec, *code_sec; 9102 bfd_vma sym_value; 9103 bfd_vma destination; 9104 bfd_boolean ok_dest; 9105 struct ppc_link_hash_entry *hash; 9106 struct ppc_link_hash_entry *fdh; 9107 struct elf_link_hash_entry *h; 9108 Elf_Internal_Sym *sym; 9109 char *stub_name; 9110 const asection *id_sec; 9111 long *opd_adjust; 9112 9113 r_type = ELF64_R_TYPE (irela->r_info); 9114 r_indx = ELF64_R_SYM (irela->r_info); 9115 9116 if (r_type >= R_PPC64_max) 9117 { 9118 bfd_set_error (bfd_error_bad_value); 9119 goto error_ret_free_internal; 9120 } 9121 9122 /* Only look for stubs on branch instructions. */ 9123 if (r_type != R_PPC64_REL24 9124 && r_type != R_PPC64_REL14 9125 && r_type != R_PPC64_REL14_BRTAKEN 9126 && r_type != R_PPC64_REL14_BRNTAKEN) 9127 continue; 9128 9129 /* Now determine the call target, its name, value, 9130 section. */ 9131 if (!get_sym_h (&h, &sym, &sym_sec, NULL, &local_syms, 9132 r_indx, input_bfd)) 9133 goto error_ret_free_internal; 9134 hash = (struct ppc_link_hash_entry *) h; 9135 9136 ok_dest = FALSE; 9137 fdh = NULL; 9138 sym_value = 0; 9139 if (hash == NULL) 9140 { 9141 sym_value = sym->st_value; 9142 ok_dest = TRUE; 9143 } 9144 else if (hash->elf.root.type == bfd_link_hash_defined 9145 || hash->elf.root.type == bfd_link_hash_defweak) 9146 { 9147 sym_value = hash->elf.root.u.def.value; 9148 if (sym_sec->output_section != NULL) 9149 ok_dest = TRUE; 9150 } 9151 else if (hash->elf.root.type == bfd_link_hash_undefweak 9152 || hash->elf.root.type == bfd_link_hash_undefined) 9153 { 9154 /* Recognise an old ABI func code entry sym, and 9155 use the func descriptor sym instead if it is 9156 defined. */ 9157 if (hash->elf.root.root.string[0] == '.' 9158 && (fdh = get_fdh (hash, htab)) != NULL) 9159 { 9160 if (fdh->elf.root.type == bfd_link_hash_defined 9161 || fdh->elf.root.type == bfd_link_hash_defweak) 9162 { 9163 sym_sec = fdh->elf.root.u.def.section; 9164 sym_value = fdh->elf.root.u.def.value; 9165 if (sym_sec->output_section != NULL) 9166 ok_dest = TRUE; 9167 } 9168 else 9169 fdh = NULL; 9170 } 9171 } 9172 else 9173 { 9174 bfd_set_error (bfd_error_bad_value); 9175 goto error_ret_free_internal; 9176 } 9177 9178 destination = 0; 9179 if (ok_dest) 9180 { 9181 sym_value += irela->r_addend; 9182 destination = (sym_value 9183 + sym_sec->output_offset 9184 + sym_sec->output_section->vma); 9185 } 9186 9187 code_sec = sym_sec; 9188 opd_adjust = get_opd_info (sym_sec); 9189 if (opd_adjust != NULL) 9190 { 9191 bfd_vma dest; 9192 9193 if (hash == NULL) 9194 { 9195 long adjust = opd_adjust[sym_value / 8]; 9196 if (adjust == -1) 9197 continue; 9198 sym_value += adjust; 9199 } 9200 dest = opd_entry_value (sym_sec, sym_value, 9201 &code_sec, &sym_value); 9202 if (dest != (bfd_vma) -1) 9203 { 9204 destination = dest; 9205 if (fdh != NULL) 9206 { 9207 /* Fixup old ABI sym to point at code 9208 entry. */ 9209 hash->elf.root.type = bfd_link_hash_defweak; 9210 hash->elf.root.u.def.section = code_sec; 9211 hash->elf.root.u.def.value = sym_value; 9212 } 9213 } 9214 } 9215 9216 /* Determine what (if any) linker stub is needed. */ 9217 stub_type = ppc_type_of_stub (section, irela, &hash, 9218 destination); 9219 9220 if (stub_type != ppc_stub_plt_call) 9221 { 9222 /* Check whether we need a TOC adjusting stub. 9223 Since the linker pastes together pieces from 9224 different object files when creating the 9225 _init and _fini functions, it may be that a 9226 call to what looks like a local sym is in 9227 fact a call needing a TOC adjustment. */ 9228 if (code_sec != NULL 9229 && code_sec->output_section != NULL 9230 && (htab->stub_group[code_sec->id].toc_off 9231 != htab->stub_group[section->id].toc_off) 9232 && (code_sec->has_toc_reloc 9233 || code_sec->makes_toc_func_call)) 9234 stub_type = ppc_stub_long_branch_r2off; 9235 } 9236 9237 if (stub_type == ppc_stub_none) 9238 continue; 9239 9240 /* __tls_get_addr calls might be eliminated. */ 9241 if (stub_type != ppc_stub_plt_call 9242 && hash != NULL 9243 && (hash == htab->tls_get_addr 9244 || hash == htab->tls_get_addr_fd) 9245 && section->has_tls_reloc 9246 && irela != internal_relocs) 9247 { 9248 /* Get tls info. */ 9249 char *tls_mask; 9250 9251 if (!get_tls_mask (&tls_mask, NULL, &local_syms, 9252 irela - 1, input_bfd)) 9253 goto error_ret_free_internal; 9254 if (*tls_mask != 0) 9255 continue; 9256 } 9257 9258 /* Support for grouping stub sections. */ 9259 id_sec = htab->stub_group[section->id].link_sec; 9260 9261 /* Get the name of this stub. */ 9262 stub_name = ppc_stub_name (id_sec, sym_sec, hash, irela); 9263 if (!stub_name) 9264 goto error_ret_free_internal; 9265 9266 stub_entry = ppc_stub_hash_lookup (&htab->stub_hash_table, 9267 stub_name, FALSE, FALSE); 9268 if (stub_entry != NULL) 9269 { 9270 /* The proper stub has already been created. */ 9271 free (stub_name); 9272 continue; 9273 } 9274 9275 stub_entry = ppc_add_stub (stub_name, section, htab); 9276 if (stub_entry == NULL) 9277 { 9278 free (stub_name); 9279 error_ret_free_internal: 9280 if (elf_section_data (section)->relocs == NULL) 9281 free (internal_relocs); 9282 error_ret_free_local: 9283 if (local_syms != NULL 9284 && (symtab_hdr->contents 9285 != (unsigned char *) local_syms)) 9286 free (local_syms); 9287 return FALSE; 9288 } 9289 9290 stub_entry->stub_type = stub_type; 9291 stub_entry->target_value = sym_value; 9292 stub_entry->target_section = code_sec; 9293 stub_entry->h = hash; 9294 stub_entry->addend = irela->r_addend; 9295 9296 if (stub_entry->h != NULL) 9297 htab->stub_globals += 1; 9298 } 9299 9300 /* We're done with the internal relocs, free them. */ 9301 if (elf_section_data (section)->relocs != internal_relocs) 9302 free (internal_relocs); 9303 } 9304 9305 if (local_syms != NULL 9306 && symtab_hdr->contents != (unsigned char *) local_syms) 9307 { 9308 if (!info->keep_memory) 9309 free (local_syms); 9310 else 9311 symtab_hdr->contents = (unsigned char *) local_syms; 9312 } 9313 } 9314 9315 /* We may have added some stubs. Find out the new size of the 9316 stub sections. */ 9317 for (stub_sec = htab->stub_bfd->sections; 9318 stub_sec != NULL; 9319 stub_sec = stub_sec->next) 9320 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 9321 { 9322 stub_sec->rawsize = stub_sec->size; 9323 stub_sec->size = 0; 9324 stub_sec->reloc_count = 0; 9325 } 9326 9327 htab->brlt->size = 0; 9328 if (htab->relbrlt != NULL) 9329 htab->relbrlt->size = 0; 9330 9331 bfd_hash_traverse (&htab->stub_hash_table, ppc_size_one_stub, info); 9332 9333 for (stub_sec = htab->stub_bfd->sections; 9334 stub_sec != NULL; 9335 stub_sec = stub_sec->next) 9336 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0 9337 && stub_sec->rawsize != stub_sec->size) 9338 break; 9339 9340 /* Exit from this loop when no stubs have been added, and no stubs 9341 have changed size. */ 9342 if (stub_sec == NULL) 9343 break; 9344 9345 /* Ask the linker to do its stuff. */ 9346 (*htab->layout_sections_again) (); 9347 } 9348 9349 /* It would be nice to strip htab->brlt from the output if the 9350 section is empty, but it's too late. If we strip sections here, 9351 the dynamic symbol table is corrupted since the section symbol 9352 for the stripped section isn't written. */ 9353 9354 return TRUE; 9355} 9356 9357/* Called after we have determined section placement. If sections 9358 move, we'll be called again. Provide a value for TOCstart. */ 9359 9360bfd_vma 9361ppc64_elf_toc (bfd *obfd) 9362{ 9363 asection *s; 9364 bfd_vma TOCstart; 9365 9366 /* The TOC consists of sections .got, .toc, .tocbss, .plt in that 9367 order. The TOC starts where the first of these sections starts. */ 9368 s = bfd_get_section_by_name (obfd, ".got"); 9369 if (s == NULL) 9370 s = bfd_get_section_by_name (obfd, ".toc"); 9371 if (s == NULL) 9372 s = bfd_get_section_by_name (obfd, ".tocbss"); 9373 if (s == NULL) 9374 s = bfd_get_section_by_name (obfd, ".plt"); 9375 if (s == NULL) 9376 { 9377 /* This may happen for 9378 o references to TOC base (SYM@toc / TOC[tc0]) without a 9379 .toc directive 9380 o bad linker script 9381 o --gc-sections and empty TOC sections 9382 9383 FIXME: Warn user? */ 9384 9385 /* Look for a likely section. We probably won't even be 9386 using TOCstart. */ 9387 for (s = obfd->sections; s != NULL; s = s->next) 9388 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA | SEC_READONLY)) 9389 == (SEC_ALLOC | SEC_SMALL_DATA)) 9390 break; 9391 if (s == NULL) 9392 for (s = obfd->sections; s != NULL; s = s->next) 9393 if ((s->flags & (SEC_ALLOC | SEC_SMALL_DATA)) 9394 == (SEC_ALLOC | SEC_SMALL_DATA)) 9395 break; 9396 if (s == NULL) 9397 for (s = obfd->sections; s != NULL; s = s->next) 9398 if ((s->flags & (SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC) 9399 break; 9400 if (s == NULL) 9401 for (s = obfd->sections; s != NULL; s = s->next) 9402 if ((s->flags & SEC_ALLOC) == SEC_ALLOC) 9403 break; 9404 } 9405 9406 TOCstart = 0; 9407 if (s != NULL) 9408 TOCstart = s->output_section->vma + s->output_offset; 9409 9410 return TOCstart; 9411} 9412 9413/* Build all the stubs associated with the current output file. 9414 The stubs are kept in a hash table attached to the main linker 9415 hash table. This function is called via gldelf64ppc_finish. */ 9416 9417bfd_boolean 9418ppc64_elf_build_stubs (bfd_boolean emit_stub_syms, 9419 struct bfd_link_info *info, 9420 char **stats) 9421{ 9422 struct ppc_link_hash_table *htab = ppc_hash_table (info); 9423 asection *stub_sec; 9424 bfd_byte *p; 9425 int stub_sec_count = 0; 9426 9427 htab->emit_stub_syms = emit_stub_syms; 9428 9429 /* Allocate memory to hold the linker stubs. */ 9430 for (stub_sec = htab->stub_bfd->sections; 9431 stub_sec != NULL; 9432 stub_sec = stub_sec->next) 9433 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0 9434 && stub_sec->size != 0) 9435 { 9436 stub_sec->contents = bfd_zalloc (htab->stub_bfd, stub_sec->size); 9437 if (stub_sec->contents == NULL) 9438 return FALSE; 9439 /* We want to check that built size is the same as calculated 9440 size. rawsize is a convenient location to use. */ 9441 stub_sec->rawsize = stub_sec->size; 9442 stub_sec->size = 0; 9443 } 9444 9445 if (htab->plt != NULL) 9446 { 9447 unsigned int indx; 9448 bfd_vma plt0; 9449 9450 /* Build the .glink plt call stub. */ 9451 plt0 = (htab->plt->output_section->vma 9452 + htab->plt->output_offset 9453 - (htab->glink->output_section->vma 9454 + htab->glink->output_offset 9455 + GLINK_CALL_STUB_SIZE)); 9456 if (plt0 + 0x80008000 > 0xffffffff) 9457 { 9458 (*_bfd_error_handler) (_(".glink and .plt too far apart")); 9459 bfd_set_error (bfd_error_bad_value); 9460 return FALSE; 9461 } 9462 9463 if (htab->emit_stub_syms) 9464 { 9465 struct elf_link_hash_entry *h; 9466 h = elf_link_hash_lookup (&htab->elf, "__glink", TRUE, FALSE, FALSE); 9467 if (h == NULL) 9468 return FALSE; 9469 if (h->root.type == bfd_link_hash_new) 9470 { 9471 h->root.type = bfd_link_hash_defined; 9472 h->root.u.def.section = htab->glink; 9473 h->root.u.def.value = 0; 9474 h->ref_regular = 1; 9475 h->def_regular = 1; 9476 h->ref_regular_nonweak = 1; 9477 h->forced_local = 1; 9478 h->non_elf = 0; 9479 } 9480 } 9481 p = htab->glink->contents; 9482 bfd_put_32 (htab->glink->owner, MFCTR_R12, p); 9483 p += 4; 9484 bfd_put_32 (htab->glink->owner, SLDI_R11_R0_3, p); 9485 p += 4; 9486 bfd_put_32 (htab->glink->owner, ADDIC_R2_R0_32K, p); 9487 p += 4; 9488 bfd_put_32 (htab->glink->owner, SUB_R12_R12_R11, p); 9489 p += 4; 9490 bfd_put_32 (htab->glink->owner, SRADI_R2_R2_63, p); 9491 p += 4; 9492 bfd_put_32 (htab->glink->owner, SLDI_R11_R0_2, p); 9493 p += 4; 9494 bfd_put_32 (htab->glink->owner, AND_R2_R2_R11, p); 9495 p += 4; 9496 bfd_put_32 (htab->glink->owner, SUB_R12_R12_R11, p); 9497 p += 4; 9498 bfd_put_32 (htab->glink->owner, ADD_R12_R12_R2, p); 9499 p += 4; 9500 bfd_put_32 (htab->glink->owner, ADDIS_R12_R12 | PPC_HA (plt0), p); 9501 p += 4; 9502 bfd_put_32 (htab->glink->owner, LD_R11_0R12 | PPC_LO (plt0), p); 9503 p += 4; 9504 bfd_put_32 (htab->glink->owner, ADDI_R12_R12 | PPC_LO (plt0), p); 9505 p += 4; 9506 bfd_put_32 (htab->glink->owner, LD_R2_0R12 | 8, p); 9507 p += 4; 9508 bfd_put_32 (htab->glink->owner, MTCTR_R11, p); 9509 p += 4; 9510 bfd_put_32 (htab->glink->owner, LD_R11_0R12 | 16, p); 9511 p += 4; 9512 bfd_put_32 (htab->glink->owner, BCTR, p); 9513 p += 4; 9514 9515 /* Build the .glink lazy link call stubs. */ 9516 indx = 0; 9517 while (p < htab->glink->contents + htab->glink->size) 9518 { 9519 if (indx < 0x8000) 9520 { 9521 bfd_put_32 (htab->glink->owner, LI_R0_0 | indx, p); 9522 p += 4; 9523 } 9524 else 9525 { 9526 bfd_put_32 (htab->glink->owner, LIS_R0_0 | PPC_HI (indx), p); 9527 p += 4; 9528 bfd_put_32 (htab->glink->owner, ORI_R0_R0_0 | PPC_LO (indx), p); 9529 p += 4; 9530 } 9531 bfd_put_32 (htab->glink->owner, 9532 B_DOT | ((htab->glink->contents - p) & 0x3fffffc), p); 9533 indx++; 9534 p += 4; 9535 } 9536 htab->glink->rawsize = p - htab->glink->contents; 9537 } 9538 9539 if (htab->brlt->size != 0) 9540 { 9541 htab->brlt->contents = bfd_zalloc (htab->brlt->owner, 9542 htab->brlt->size); 9543 if (htab->brlt->contents == NULL) 9544 return FALSE; 9545 } 9546 if (htab->relbrlt != NULL && htab->relbrlt->size != 0) 9547 { 9548 htab->relbrlt->contents = bfd_zalloc (htab->relbrlt->owner, 9549 htab->relbrlt->size); 9550 if (htab->relbrlt->contents == NULL) 9551 return FALSE; 9552 } 9553 9554 /* Build the stubs as directed by the stub hash table. */ 9555 bfd_hash_traverse (&htab->stub_hash_table, ppc_build_one_stub, info); 9556 9557 for (stub_sec = htab->stub_bfd->sections; 9558 stub_sec != NULL; 9559 stub_sec = stub_sec->next) 9560 if ((stub_sec->flags & SEC_LINKER_CREATED) == 0) 9561 { 9562 stub_sec_count += 1; 9563 if (stub_sec->rawsize != stub_sec->size) 9564 break; 9565 } 9566 9567 if (stub_sec != NULL 9568 || htab->glink->rawsize != htab->glink->size) 9569 { 9570 htab->stub_error = TRUE; 9571 (*_bfd_error_handler) (_("stubs don't match calculated size")); 9572 } 9573 9574 if (htab->stub_error) 9575 return FALSE; 9576 9577 if (stats != NULL) 9578 { 9579 *stats = bfd_malloc (500); 9580 if (*stats == NULL) 9581 return FALSE; 9582 9583 sprintf (*stats, _("linker stubs in %u group%s\n" 9584 " branch %lu\n" 9585 " toc adjust %lu\n" 9586 " long branch %lu\n" 9587 " long toc adj %lu\n" 9588 " plt call %lu"), 9589 stub_sec_count, 9590 stub_sec_count == 1 ? "" : "s", 9591 htab->stub_count[ppc_stub_long_branch - 1], 9592 htab->stub_count[ppc_stub_long_branch_r2off - 1], 9593 htab->stub_count[ppc_stub_plt_branch - 1], 9594 htab->stub_count[ppc_stub_plt_branch_r2off - 1], 9595 htab->stub_count[ppc_stub_plt_call - 1]); 9596 } 9597 return TRUE; 9598} 9599 9600/* This function undoes the changes made by add_symbol_adjust. */ 9601 9602static bfd_boolean 9603undo_symbol_twiddle (struct elf_link_hash_entry *h, void *inf ATTRIBUTE_UNUSED) 9604{ 9605 struct ppc_link_hash_entry *eh; 9606 9607 if (h->root.type == bfd_link_hash_indirect) 9608 return TRUE; 9609 9610 if (h->root.type == bfd_link_hash_warning) 9611 h = (struct elf_link_hash_entry *) h->root.u.i.link; 9612 9613 eh = (struct ppc_link_hash_entry *) h; 9614 if (eh->elf.root.type != bfd_link_hash_undefweak || !eh->was_undefined) 9615 return TRUE; 9616 9617 eh->elf.root.type = bfd_link_hash_undefined; 9618 return TRUE; 9619} 9620 9621void 9622ppc64_elf_restore_symbols (struct bfd_link_info *info) 9623{ 9624 struct ppc_link_hash_table *htab = ppc_hash_table (info); 9625 elf_link_hash_traverse (&htab->elf, undo_symbol_twiddle, info); 9626} 9627 9628/* What to do when ld finds relocations against symbols defined in 9629 discarded sections. */ 9630 9631static unsigned int 9632ppc64_elf_action_discarded (asection *sec) 9633{ 9634 if (strcmp (".opd", sec->name) == 0) 9635 return 0; 9636 9637 if (strcmp (".toc", sec->name) == 0) 9638 return 0; 9639 9640 if (strcmp (".toc1", sec->name) == 0) 9641 return 0; 9642 9643 return _bfd_elf_default_action_discarded (sec); 9644} 9645 9646/* The RELOCATE_SECTION function is called by the ELF backend linker 9647 to handle the relocations for a section. 9648 9649 The relocs are always passed as Rela structures; if the section 9650 actually uses Rel structures, the r_addend field will always be 9651 zero. 9652 9653 This function is responsible for adjust the section contents as 9654 necessary, and (if using Rela relocs and generating a 9655 relocatable output file) adjusting the reloc addend as 9656 necessary. 9657 9658 This function does not have to worry about setting the reloc 9659 address or the reloc symbol index. 9660 9661 LOCAL_SYMS is a pointer to the swapped in local symbols. 9662 9663 LOCAL_SECTIONS is an array giving the section in the input file 9664 corresponding to the st_shndx field of each local symbol. 9665 9666 The global hash table entry for the global symbols can be found 9667 via elf_sym_hashes (input_bfd). 9668 9669 When generating relocatable output, this function must handle 9670 STB_LOCAL/STT_SECTION symbols specially. The output symbol is 9671 going to be the section symbol corresponding to the output 9672 section, which means that the addend must be adjusted 9673 accordingly. */ 9674 9675static bfd_boolean 9676ppc64_elf_relocate_section (bfd *output_bfd, 9677 struct bfd_link_info *info, 9678 bfd *input_bfd, 9679 asection *input_section, 9680 bfd_byte *contents, 9681 Elf_Internal_Rela *relocs, 9682 Elf_Internal_Sym *local_syms, 9683 asection **local_sections) 9684{ 9685 struct ppc_link_hash_table *htab; 9686 Elf_Internal_Shdr *symtab_hdr; 9687 struct elf_link_hash_entry **sym_hashes; 9688 Elf_Internal_Rela *rel; 9689 Elf_Internal_Rela *relend; 9690 Elf_Internal_Rela outrel; 9691 bfd_byte *loc; 9692 struct got_entry **local_got_ents; 9693 bfd_vma TOCstart; 9694 bfd_boolean ret = TRUE; 9695 bfd_boolean is_opd; 9696 /* Disabled until we sort out how ld should choose 'y' vs 'at'. */ 9697 bfd_boolean is_power4 = FALSE; 9698 9699 /* Initialize howto table if needed. */ 9700 if (!ppc64_elf_howto_table[R_PPC64_ADDR32]) 9701 ppc_howto_init (); 9702 9703 htab = ppc_hash_table (info); 9704 9705 /* Don't relocate stub sections. */ 9706 if (input_section->owner == htab->stub_bfd) 9707 return TRUE; 9708 9709 local_got_ents = elf_local_got_ents (input_bfd); 9710 TOCstart = elf_gp (output_bfd); 9711 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 9712 sym_hashes = elf_sym_hashes (input_bfd); 9713 is_opd = ppc64_elf_section_data (input_section)->opd.adjust != NULL; 9714 9715 rel = relocs; 9716 relend = relocs + input_section->reloc_count; 9717 for (; rel < relend; rel++) 9718 { 9719 enum elf_ppc64_reloc_type r_type; 9720 bfd_vma addend, orig_addend; 9721 bfd_reloc_status_type r; 9722 Elf_Internal_Sym *sym; 9723 asection *sec; 9724 struct elf_link_hash_entry *h_elf; 9725 struct ppc_link_hash_entry *h; 9726 struct ppc_link_hash_entry *fdh; 9727 const char *sym_name; 9728 unsigned long r_symndx, toc_symndx; 9729 char tls_mask, tls_gd, tls_type; 9730 char sym_type; 9731 bfd_vma relocation; 9732 bfd_boolean unresolved_reloc; 9733 bfd_boolean warned; 9734 unsigned long insn, mask; 9735 struct ppc_stub_hash_entry *stub_entry; 9736 bfd_vma max_br_offset; 9737 bfd_vma from; 9738 9739 r_type = ELF64_R_TYPE (rel->r_info); 9740 r_symndx = ELF64_R_SYM (rel->r_info); 9741 9742 /* For old style R_PPC64_TOC relocs with a zero symbol, use the 9743 symbol of the previous ADDR64 reloc. The symbol gives us the 9744 proper TOC base to use. */ 9745 if (rel->r_info == ELF64_R_INFO (0, R_PPC64_TOC) 9746 && rel != relocs 9747 && ELF64_R_TYPE (rel[-1].r_info) == R_PPC64_ADDR64 9748 && is_opd) 9749 r_symndx = ELF64_R_SYM (rel[-1].r_info); 9750 9751 sym = NULL; 9752 sec = NULL; 9753 h_elf = NULL; 9754 sym_name = NULL; 9755 unresolved_reloc = FALSE; 9756 warned = FALSE; 9757 orig_addend = rel->r_addend; 9758 9759 if (r_symndx < symtab_hdr->sh_info) 9760 { 9761 /* It's a local symbol. */ 9762 long *opd_adjust; 9763 9764 sym = local_syms + r_symndx; 9765 sec = local_sections[r_symndx]; 9766 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym, sec); 9767 sym_type = ELF64_ST_TYPE (sym->st_info); 9768 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 9769 opd_adjust = get_opd_info (sec); 9770 if (opd_adjust != NULL) 9771 { 9772 long adjust = opd_adjust[(sym->st_value + rel->r_addend) / 8]; 9773 if (adjust == -1) 9774 relocation = 0; 9775 else 9776 { 9777 /* If this is a relocation against the opd section sym 9778 and we have edited .opd, adjust the reloc addend so 9779 that ld -r and ld --emit-relocs output is correct. 9780 If it is a reloc against some other .opd symbol, 9781 then the symbol value will be adjusted later. */ 9782 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) 9783 rel->r_addend += adjust; 9784 else 9785 relocation += adjust; 9786 } 9787 } 9788 if (info->relocatable) 9789 continue; 9790 } 9791 else 9792 { 9793 if (info->relocatable) 9794 continue; 9795 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 9796 r_symndx, symtab_hdr, sym_hashes, 9797 h_elf, sec, relocation, 9798 unresolved_reloc, warned); 9799 sym_name = h_elf->root.root.string; 9800 sym_type = h_elf->type; 9801 } 9802 h = (struct ppc_link_hash_entry *) h_elf; 9803 9804 /* TLS optimizations. Replace instruction sequences and relocs 9805 based on information we collected in tls_optimize. We edit 9806 RELOCS so that --emit-relocs will output something sensible 9807 for the final instruction stream. */ 9808 tls_mask = 0; 9809 tls_gd = 0; 9810 toc_symndx = 0; 9811 if (IS_PPC64_TLS_RELOC (r_type)) 9812 { 9813 if (h != NULL) 9814 tls_mask = h->tls_mask; 9815 else if (local_got_ents != NULL) 9816 { 9817 char *lgot_masks; 9818 lgot_masks = (char *) (local_got_ents + symtab_hdr->sh_info); 9819 tls_mask = lgot_masks[r_symndx]; 9820 } 9821 if (tls_mask == 0 && r_type == R_PPC64_TLS) 9822 { 9823 /* Check for toc tls entries. */ 9824 char *toc_tls; 9825 9826 if (!get_tls_mask (&toc_tls, &toc_symndx, &local_syms, 9827 rel, input_bfd)) 9828 return FALSE; 9829 9830 if (toc_tls) 9831 tls_mask = *toc_tls; 9832 } 9833 } 9834 9835 /* Check that tls relocs are used with tls syms, and non-tls 9836 relocs are used with non-tls syms. */ 9837 if (r_symndx != 0 9838 && r_type != R_PPC64_NONE 9839 && (h == NULL 9840 || h->elf.root.type == bfd_link_hash_defined 9841 || h->elf.root.type == bfd_link_hash_defweak) 9842 && IS_PPC64_TLS_RELOC (r_type) != (sym_type == STT_TLS)) 9843 { 9844 if (r_type == R_PPC64_TLS && tls_mask != 0) 9845 /* R_PPC64_TLS is OK against a symbol in the TOC. */ 9846 ; 9847 else 9848 (*_bfd_error_handler) 9849 (sym_type == STT_TLS 9850 ? _("%B(%A+0x%lx): %s used with TLS symbol %s") 9851 : _("%B(%A+0x%lx): %s used with non-TLS symbol %s"), 9852 input_bfd, 9853 input_section, 9854 (long) rel->r_offset, 9855 ppc64_elf_howto_table[r_type]->name, 9856 sym_name); 9857 } 9858 9859 /* Ensure reloc mapping code below stays sane. */ 9860 if (R_PPC64_TOC16_LO_DS != R_PPC64_TOC16_DS + 1 9861 || R_PPC64_TOC16_LO != R_PPC64_TOC16 + 1 9862 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TLSGD16 & 3) 9863 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TLSGD16_LO & 3) 9864 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TLSGD16_HI & 3) 9865 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TLSGD16_HA & 3) 9866 || (R_PPC64_GOT_TLSLD16 & 3) != (R_PPC64_GOT_TPREL16_DS & 3) 9867 || (R_PPC64_GOT_TLSLD16_LO & 3) != (R_PPC64_GOT_TPREL16_LO_DS & 3) 9868 || (R_PPC64_GOT_TLSLD16_HI & 3) != (R_PPC64_GOT_TPREL16_HI & 3) 9869 || (R_PPC64_GOT_TLSLD16_HA & 3) != (R_PPC64_GOT_TPREL16_HA & 3)) 9870 abort (); 9871 9872 switch (r_type) 9873 { 9874 default: 9875 break; 9876 9877 case R_PPC64_TOC16: 9878 case R_PPC64_TOC16_LO: 9879 case R_PPC64_TOC16_DS: 9880 case R_PPC64_TOC16_LO_DS: 9881 { 9882 /* Check for toc tls entries. */ 9883 char *toc_tls; 9884 int retval; 9885 9886 retval = get_tls_mask (&toc_tls, &toc_symndx, &local_syms, 9887 rel, input_bfd); 9888 if (retval == 0) 9889 return FALSE; 9890 9891 if (toc_tls) 9892 { 9893 tls_mask = *toc_tls; 9894 if (r_type == R_PPC64_TOC16_DS 9895 || r_type == R_PPC64_TOC16_LO_DS) 9896 { 9897 if (tls_mask != 0 9898 && (tls_mask & (TLS_DTPREL | TLS_TPREL)) == 0) 9899 goto toctprel; 9900 } 9901 else 9902 { 9903 /* If we found a GD reloc pair, then we might be 9904 doing a GD->IE transition. */ 9905 if (retval == 2) 9906 { 9907 tls_gd = TLS_TPRELGD; 9908 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 9909 goto tls_get_addr_check; 9910 } 9911 else if (retval == 3) 9912 { 9913 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 9914 goto tls_get_addr_check; 9915 } 9916 } 9917 } 9918 } 9919 break; 9920 9921 case R_PPC64_GOT_TPREL16_DS: 9922 case R_PPC64_GOT_TPREL16_LO_DS: 9923 if (tls_mask != 0 9924 && (tls_mask & TLS_TPREL) == 0) 9925 { 9926 toctprel: 9927 insn = bfd_get_32 (output_bfd, contents + rel->r_offset - 2); 9928 insn &= 31 << 21; 9929 insn |= 0x3c0d0000; /* addis 0,13,0 */ 9930 bfd_put_32 (output_bfd, insn, contents + rel->r_offset - 2); 9931 r_type = R_PPC64_TPREL16_HA; 9932 if (toc_symndx != 0) 9933 { 9934 rel->r_info = ELF64_R_INFO (toc_symndx, r_type); 9935 /* We changed the symbol. Start over in order to 9936 get h, sym, sec etc. right. */ 9937 rel--; 9938 continue; 9939 } 9940 else 9941 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 9942 } 9943 break; 9944 9945 case R_PPC64_TLS: 9946 if (tls_mask != 0 9947 && (tls_mask & TLS_TPREL) == 0) 9948 { 9949 bfd_vma rtra; 9950 insn = bfd_get_32 (output_bfd, contents + rel->r_offset); 9951 if ((insn & ((0x3f << 26) | (31 << 11))) 9952 == ((31 << 26) | (13 << 11))) 9953 rtra = insn & ((1 << 26) - (1 << 16)); 9954 else if ((insn & ((0x3f << 26) | (31 << 16))) 9955 == ((31 << 26) | (13 << 16))) 9956 rtra = (insn & (31 << 21)) | ((insn & (31 << 11)) << 5); 9957 else 9958 abort (); 9959 if ((insn & ((1 << 11) - (1 << 1))) == 266 << 1) 9960 /* add -> addi. */ 9961 insn = 14 << 26; 9962 else if ((insn & (31 << 1)) == 23 << 1 9963 && ((insn & (31 << 6)) < 14 << 6 9964 || ((insn & (31 << 6)) >= 16 << 6 9965 && (insn & (31 << 6)) < 24 << 6))) 9966 /* load and store indexed -> dform. */ 9967 insn = (32 | ((insn >> 6) & 31)) << 26; 9968 else if ((insn & (31 << 1)) == 21 << 1 9969 && (insn & (0x1a << 6)) == 0) 9970 /* ldx, ldux, stdx, stdux -> ld, ldu, std, stdu. */ 9971 insn = (((58 | ((insn >> 6) & 4)) << 26) 9972 | ((insn >> 6) & 1)); 9973 else if ((insn & (31 << 1)) == 21 << 1 9974 && (insn & ((1 << 11) - (1 << 1))) == 341 << 1) 9975 /* lwax -> lwa. */ 9976 insn = (58 << 26) | 2; 9977 else 9978 abort (); 9979 insn |= rtra; 9980 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 9981 /* Was PPC64_TLS which sits on insn boundary, now 9982 PPC64_TPREL16_LO which is at insn+2. */ 9983 rel->r_offset += 2; 9984 r_type = R_PPC64_TPREL16_LO; 9985 if (toc_symndx != 0) 9986 { 9987 rel->r_info = ELF64_R_INFO (toc_symndx, r_type); 9988 /* We changed the symbol. Start over in order to 9989 get h, sym, sec etc. right. */ 9990 rel--; 9991 continue; 9992 } 9993 else 9994 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 9995 } 9996 break; 9997 9998 case R_PPC64_GOT_TLSGD16_HI: 9999 case R_PPC64_GOT_TLSGD16_HA: 10000 tls_gd = TLS_TPRELGD; 10001 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 10002 goto tls_gdld_hi; 10003 break; 10004 10005 case R_PPC64_GOT_TLSLD16_HI: 10006 case R_PPC64_GOT_TLSLD16_HA: 10007 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 10008 { 10009 tls_gdld_hi: 10010 if ((tls_mask & tls_gd) != 0) 10011 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3) 10012 + R_PPC64_GOT_TPREL16_DS); 10013 else 10014 { 10015 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset); 10016 rel->r_offset -= 2; 10017 r_type = R_PPC64_NONE; 10018 } 10019 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10020 } 10021 break; 10022 10023 case R_PPC64_GOT_TLSGD16: 10024 case R_PPC64_GOT_TLSGD16_LO: 10025 tls_gd = TLS_TPRELGD; 10026 if (tls_mask != 0 && (tls_mask & TLS_GD) == 0) 10027 goto tls_get_addr_check; 10028 break; 10029 10030 case R_PPC64_GOT_TLSLD16: 10031 case R_PPC64_GOT_TLSLD16_LO: 10032 if (tls_mask != 0 && (tls_mask & TLS_LD) == 0) 10033 { 10034 tls_get_addr_check: 10035 if (rel + 1 < relend) 10036 { 10037 enum elf_ppc64_reloc_type r_type2; 10038 unsigned long r_symndx2; 10039 struct elf_link_hash_entry *h2; 10040 bfd_vma insn1, insn2, insn3; 10041 bfd_vma offset; 10042 10043 /* The next instruction should be a call to 10044 __tls_get_addr. Peek at the reloc to be sure. */ 10045 r_type2 = ELF64_R_TYPE (rel[1].r_info); 10046 r_symndx2 = ELF64_R_SYM (rel[1].r_info); 10047 if (r_symndx2 < symtab_hdr->sh_info 10048 || (r_type2 != R_PPC64_REL14 10049 && r_type2 != R_PPC64_REL14_BRTAKEN 10050 && r_type2 != R_PPC64_REL14_BRNTAKEN 10051 && r_type2 != R_PPC64_REL24)) 10052 break; 10053 10054 h2 = sym_hashes[r_symndx2 - symtab_hdr->sh_info]; 10055 while (h2->root.type == bfd_link_hash_indirect 10056 || h2->root.type == bfd_link_hash_warning) 10057 h2 = (struct elf_link_hash_entry *) h2->root.u.i.link; 10058 if (h2 == NULL || (h2 != &htab->tls_get_addr->elf 10059 && h2 != &htab->tls_get_addr_fd->elf)) 10060 break; 10061 10062 /* OK, it checks out. Replace the call. */ 10063 offset = rel[1].r_offset; 10064 insn1 = bfd_get_32 (output_bfd, 10065 contents + rel->r_offset - 2); 10066 insn3 = bfd_get_32 (output_bfd, 10067 contents + offset + 4); 10068 if ((tls_mask & tls_gd) != 0) 10069 { 10070 /* IE */ 10071 insn1 &= (1 << 26) - (1 << 2); 10072 insn1 |= 58 << 26; /* ld */ 10073 insn2 = 0x7c636a14; /* add 3,3,13 */ 10074 rel[1].r_info = ELF64_R_INFO (r_symndx2, R_PPC64_NONE); 10075 if ((tls_mask & TLS_EXPLICIT) == 0) 10076 r_type = (((r_type - (R_PPC64_GOT_TLSGD16 & 3)) & 3) 10077 + R_PPC64_GOT_TPREL16_DS); 10078 else 10079 r_type += R_PPC64_TOC16_DS - R_PPC64_TOC16; 10080 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10081 } 10082 else 10083 { 10084 /* LE */ 10085 insn1 = 0x3c6d0000; /* addis 3,13,0 */ 10086 insn2 = 0x38630000; /* addi 3,3,0 */ 10087 if (tls_gd == 0) 10088 { 10089 /* Was an LD reloc. */ 10090 r_symndx = 0; 10091 rel->r_addend = htab->elf.tls_sec->vma + DTP_OFFSET; 10092 rel[1].r_addend = htab->elf.tls_sec->vma + DTP_OFFSET; 10093 } 10094 else if (toc_symndx != 0) 10095 r_symndx = toc_symndx; 10096 r_type = R_PPC64_TPREL16_HA; 10097 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10098 rel[1].r_info = ELF64_R_INFO (r_symndx, 10099 R_PPC64_TPREL16_LO); 10100 rel[1].r_offset += 2; 10101 } 10102 if (insn3 == NOP 10103 || insn3 == CROR_151515 || insn3 == CROR_313131) 10104 { 10105 insn3 = insn2; 10106 insn2 = NOP; 10107 rel[1].r_offset += 4; 10108 } 10109 bfd_put_32 (output_bfd, insn1, contents + rel->r_offset - 2); 10110 bfd_put_32 (output_bfd, insn2, contents + offset); 10111 bfd_put_32 (output_bfd, insn3, contents + offset + 4); 10112 if (tls_gd == 0 || toc_symndx != 0) 10113 { 10114 /* We changed the symbol. Start over in order 10115 to get h, sym, sec etc. right. */ 10116 rel--; 10117 continue; 10118 } 10119 } 10120 } 10121 break; 10122 10123 case R_PPC64_DTPMOD64: 10124 if (rel + 1 < relend 10125 && rel[1].r_info == ELF64_R_INFO (r_symndx, R_PPC64_DTPREL64) 10126 && rel[1].r_offset == rel->r_offset + 8) 10127 { 10128 if ((tls_mask & TLS_GD) == 0) 10129 { 10130 rel[1].r_info = ELF64_R_INFO (r_symndx, R_PPC64_NONE); 10131 if ((tls_mask & TLS_TPRELGD) != 0) 10132 r_type = R_PPC64_TPREL64; 10133 else 10134 { 10135 bfd_put_64 (output_bfd, 1, contents + rel->r_offset); 10136 r_type = R_PPC64_NONE; 10137 } 10138 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10139 } 10140 } 10141 else 10142 { 10143 if ((tls_mask & TLS_LD) == 0) 10144 { 10145 bfd_put_64 (output_bfd, 1, contents + rel->r_offset); 10146 r_type = R_PPC64_NONE; 10147 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10148 } 10149 } 10150 break; 10151 10152 case R_PPC64_TPREL64: 10153 if ((tls_mask & TLS_TPREL) == 0) 10154 { 10155 r_type = R_PPC64_NONE; 10156 rel->r_info = ELF64_R_INFO (r_symndx, r_type); 10157 } 10158 break; 10159 } 10160 10161 /* Handle other relocations that tweak non-addend part of insn. */ 10162 insn = 0; 10163 max_br_offset = 1 << 25; 10164 addend = rel->r_addend; 10165 switch (r_type) 10166 { 10167 default: 10168 break; 10169 10170 /* Branch taken prediction relocations. */ 10171 case R_PPC64_ADDR14_BRTAKEN: 10172 case R_PPC64_REL14_BRTAKEN: 10173 insn = 0x01 << 21; /* 'y' or 't' bit, lowest bit of BO field. */ 10174 /* Fall thru. */ 10175 10176 /* Branch not taken prediction relocations. */ 10177 case R_PPC64_ADDR14_BRNTAKEN: 10178 case R_PPC64_REL14_BRNTAKEN: 10179 insn |= bfd_get_32 (output_bfd, 10180 contents + rel->r_offset) & ~(0x01 << 21); 10181 /* Fall thru. */ 10182 10183 case R_PPC64_REL14: 10184 max_br_offset = 1 << 15; 10185 /* Fall thru. */ 10186 10187 case R_PPC64_REL24: 10188 /* Calls to functions with a different TOC, such as calls to 10189 shared objects, need to alter the TOC pointer. This is 10190 done using a linkage stub. A REL24 branching to these 10191 linkage stubs needs to be followed by a nop, as the nop 10192 will be replaced with an instruction to restore the TOC 10193 base pointer. */ 10194 stub_entry = NULL; 10195 fdh = h; 10196 if (((h != NULL 10197 && (((fdh = h->oh) != NULL 10198 && fdh->elf.plt.plist != NULL) 10199 || (fdh = h)->elf.plt.plist != NULL)) 10200 || (sec != NULL 10201 && sec->output_section != NULL 10202 && sec->id <= htab->top_id 10203 && (htab->stub_group[sec->id].toc_off 10204 != htab->stub_group[input_section->id].toc_off))) 10205 && (stub_entry = ppc_get_stub_entry (input_section, sec, fdh, 10206 rel, htab)) != NULL 10207 && (stub_entry->stub_type == ppc_stub_plt_call 10208 || stub_entry->stub_type == ppc_stub_plt_branch_r2off 10209 || stub_entry->stub_type == ppc_stub_long_branch_r2off)) 10210 { 10211 bfd_boolean can_plt_call = FALSE; 10212 10213 if (rel->r_offset + 8 <= input_section->size) 10214 { 10215 unsigned long nop; 10216 nop = bfd_get_32 (input_bfd, contents + rel->r_offset + 4); 10217 if (nop == NOP 10218 || nop == CROR_151515 || nop == CROR_313131) 10219 { 10220 bfd_put_32 (input_bfd, LD_R2_40R1, 10221 contents + rel->r_offset + 4); 10222 can_plt_call = TRUE; 10223 } 10224 } 10225 10226 if (!can_plt_call) 10227 { 10228 if (stub_entry->stub_type == ppc_stub_plt_call) 10229 { 10230 /* If this is a plain branch rather than a branch 10231 and link, don't require a nop. However, don't 10232 allow tail calls in a shared library as they 10233 will result in r2 being corrupted. */ 10234 unsigned long br; 10235 br = bfd_get_32 (input_bfd, contents + rel->r_offset); 10236 if (info->executable && (br & 1) == 0) 10237 can_plt_call = TRUE; 10238 else 10239 stub_entry = NULL; 10240 } 10241 else if (h != NULL 10242 && strcmp (h->elf.root.root.string, 10243 ".__libc_start_main") == 0) 10244 { 10245 /* Allow crt1 branch to go via a toc adjusting stub. */ 10246 can_plt_call = TRUE; 10247 } 10248 else 10249 { 10250 if (strcmp (input_section->output_section->name, 10251 ".init") == 0 10252 || strcmp (input_section->output_section->name, 10253 ".fini") == 0) 10254 (*_bfd_error_handler) 10255 (_("%B(%A+0x%lx): automatic multiple TOCs " 10256 "not supported using your crt files; " 10257 "recompile with -mminimal-toc or upgrade gcc"), 10258 input_bfd, 10259 input_section, 10260 (long) rel->r_offset); 10261 else 10262 (*_bfd_error_handler) 10263 (_("%B(%A+0x%lx): sibling call optimization to `%s' " 10264 "does not allow automatic multiple TOCs; " 10265 "recompile with -mminimal-toc or " 10266 "-fno-optimize-sibling-calls, " 10267 "or make `%s' extern"), 10268 input_bfd, 10269 input_section, 10270 (long) rel->r_offset, 10271 sym_name, 10272 sym_name); 10273 bfd_set_error (bfd_error_bad_value); 10274 ret = FALSE; 10275 } 10276 } 10277 10278 if (can_plt_call 10279 && stub_entry->stub_type == ppc_stub_plt_call) 10280 unresolved_reloc = FALSE; 10281 } 10282 10283 if (stub_entry == NULL 10284 && get_opd_info (sec) != NULL) 10285 { 10286 /* The branch destination is the value of the opd entry. */ 10287 bfd_vma off = (relocation + addend 10288 - sec->output_section->vma 10289 - sec->output_offset); 10290 bfd_vma dest = opd_entry_value (sec, off, NULL, NULL); 10291 if (dest != (bfd_vma) -1) 10292 { 10293 relocation = dest; 10294 addend = 0; 10295 } 10296 } 10297 10298 /* If the branch is out of reach we ought to have a long 10299 branch stub. */ 10300 from = (rel->r_offset 10301 + input_section->output_offset 10302 + input_section->output_section->vma); 10303 10304 if (stub_entry == NULL 10305 && (relocation + addend - from + max_br_offset 10306 >= 2 * max_br_offset) 10307 && r_type != R_PPC64_ADDR14_BRTAKEN 10308 && r_type != R_PPC64_ADDR14_BRNTAKEN) 10309 stub_entry = ppc_get_stub_entry (input_section, sec, h, rel, 10310 htab); 10311 10312 if (stub_entry != NULL) 10313 { 10314 /* Munge up the value and addend so that we call the stub 10315 rather than the procedure directly. */ 10316 relocation = (stub_entry->stub_offset 10317 + stub_entry->stub_sec->output_offset 10318 + stub_entry->stub_sec->output_section->vma); 10319 addend = 0; 10320 } 10321 10322 if (insn != 0) 10323 { 10324 if (is_power4) 10325 { 10326 /* Set 'a' bit. This is 0b00010 in BO field for branch 10327 on CR(BI) insns (BO == 001at or 011at), and 0b01000 10328 for branch on CTR insns (BO == 1a00t or 1a01t). */ 10329 if ((insn & (0x14 << 21)) == (0x04 << 21)) 10330 insn |= 0x02 << 21; 10331 else if ((insn & (0x14 << 21)) == (0x10 << 21)) 10332 insn |= 0x08 << 21; 10333 else 10334 break; 10335 } 10336 else 10337 { 10338 /* Invert 'y' bit if not the default. */ 10339 if ((bfd_signed_vma) (relocation + addend - from) < 0) 10340 insn ^= 0x01 << 21; 10341 } 10342 10343 bfd_put_32 (output_bfd, insn, contents + rel->r_offset); 10344 } 10345 10346 /* NOP out calls to undefined weak functions. 10347 We can thus call a weak function without first 10348 checking whether the function is defined. */ 10349 else if (h != NULL 10350 && h->elf.root.type == bfd_link_hash_undefweak 10351 && r_type == R_PPC64_REL24 10352 && relocation == 0 10353 && addend == 0) 10354 { 10355 bfd_put_32 (output_bfd, NOP, contents + rel->r_offset); 10356 continue; 10357 } 10358 break; 10359 } 10360 10361 /* Set `addend'. */ 10362 tls_type = 0; 10363 switch (r_type) 10364 { 10365 default: 10366 (*_bfd_error_handler) 10367 (_("%B: unknown relocation type %d for symbol %s"), 10368 input_bfd, (int) r_type, sym_name); 10369 10370 bfd_set_error (bfd_error_bad_value); 10371 ret = FALSE; 10372 continue; 10373 10374 case R_PPC64_NONE: 10375 case R_PPC64_TLS: 10376 case R_PPC64_GNU_VTINHERIT: 10377 case R_PPC64_GNU_VTENTRY: 10378 continue; 10379 10380 /* GOT16 relocations. Like an ADDR16 using the symbol's 10381 address in the GOT as relocation value instead of the 10382 symbol's value itself. Also, create a GOT entry for the 10383 symbol and put the symbol value there. */ 10384 case R_PPC64_GOT_TLSGD16: 10385 case R_PPC64_GOT_TLSGD16_LO: 10386 case R_PPC64_GOT_TLSGD16_HI: 10387 case R_PPC64_GOT_TLSGD16_HA: 10388 tls_type = TLS_TLS | TLS_GD; 10389 goto dogot; 10390 10391 case R_PPC64_GOT_TLSLD16: 10392 case R_PPC64_GOT_TLSLD16_LO: 10393 case R_PPC64_GOT_TLSLD16_HI: 10394 case R_PPC64_GOT_TLSLD16_HA: 10395 tls_type = TLS_TLS | TLS_LD; 10396 goto dogot; 10397 10398 case R_PPC64_GOT_TPREL16_DS: 10399 case R_PPC64_GOT_TPREL16_LO_DS: 10400 case R_PPC64_GOT_TPREL16_HI: 10401 case R_PPC64_GOT_TPREL16_HA: 10402 tls_type = TLS_TLS | TLS_TPREL; 10403 goto dogot; 10404 10405 case R_PPC64_GOT_DTPREL16_DS: 10406 case R_PPC64_GOT_DTPREL16_LO_DS: 10407 case R_PPC64_GOT_DTPREL16_HI: 10408 case R_PPC64_GOT_DTPREL16_HA: 10409 tls_type = TLS_TLS | TLS_DTPREL; 10410 goto dogot; 10411 10412 case R_PPC64_GOT16: 10413 case R_PPC64_GOT16_LO: 10414 case R_PPC64_GOT16_HI: 10415 case R_PPC64_GOT16_HA: 10416 case R_PPC64_GOT16_DS: 10417 case R_PPC64_GOT16_LO_DS: 10418 dogot: 10419 { 10420 /* Relocation is to the entry for this symbol in the global 10421 offset table. */ 10422 asection *got; 10423 bfd_vma *offp; 10424 bfd_vma off; 10425 unsigned long indx = 0; 10426 10427 if (tls_type == (TLS_TLS | TLS_LD) 10428 && (h == NULL 10429 || !h->elf.def_dynamic)) 10430 offp = &ppc64_tlsld_got (input_bfd)->offset; 10431 else 10432 { 10433 struct got_entry *ent; 10434 10435 if (h != NULL) 10436 { 10437 bfd_boolean dyn = htab->elf.dynamic_sections_created; 10438 if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, 10439 &h->elf) 10440 || (info->shared 10441 && SYMBOL_REFERENCES_LOCAL (info, &h->elf))) 10442 /* This is actually a static link, or it is a 10443 -Bsymbolic link and the symbol is defined 10444 locally, or the symbol was forced to be local 10445 because of a version file. */ 10446 ; 10447 else 10448 { 10449 indx = h->elf.dynindx; 10450 unresolved_reloc = FALSE; 10451 } 10452 ent = h->elf.got.glist; 10453 } 10454 else 10455 { 10456 if (local_got_ents == NULL) 10457 abort (); 10458 ent = local_got_ents[r_symndx]; 10459 } 10460 10461 for (; ent != NULL; ent = ent->next) 10462 if (ent->addend == orig_addend 10463 && ent->owner == input_bfd 10464 && ent->tls_type == tls_type) 10465 break; 10466 if (ent == NULL) 10467 abort (); 10468 offp = &ent->got.offset; 10469 } 10470 10471 got = ppc64_elf_tdata (input_bfd)->got; 10472 if (got == NULL) 10473 abort (); 10474 10475 /* The offset must always be a multiple of 8. We use the 10476 least significant bit to record whether we have already 10477 processed this entry. */ 10478 off = *offp; 10479 if ((off & 1) != 0) 10480 off &= ~1; 10481 else 10482 { 10483 /* Generate relocs for the dynamic linker, except in 10484 the case of TLSLD where we'll use one entry per 10485 module. */ 10486 asection *relgot = ppc64_elf_tdata (input_bfd)->relgot; 10487 10488 *offp = off | 1; 10489 if ((info->shared || indx != 0) 10490 && (h == NULL 10491 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT 10492 || h->elf.root.type != bfd_link_hash_undefweak)) 10493 { 10494 outrel.r_offset = (got->output_section->vma 10495 + got->output_offset 10496 + off); 10497 outrel.r_addend = addend; 10498 if (tls_type & (TLS_LD | TLS_GD)) 10499 { 10500 outrel.r_addend = 0; 10501 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPMOD64); 10502 if (tls_type == (TLS_TLS | TLS_GD)) 10503 { 10504 loc = relgot->contents; 10505 loc += (relgot->reloc_count++ 10506 * sizeof (Elf64_External_Rela)); 10507 bfd_elf64_swap_reloca_out (output_bfd, 10508 &outrel, loc); 10509 outrel.r_offset += 8; 10510 outrel.r_addend = addend; 10511 outrel.r_info 10512 = ELF64_R_INFO (indx, R_PPC64_DTPREL64); 10513 } 10514 } 10515 else if (tls_type == (TLS_TLS | TLS_DTPREL)) 10516 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_DTPREL64); 10517 else if (tls_type == (TLS_TLS | TLS_TPREL)) 10518 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_TPREL64); 10519 else if (indx == 0) 10520 { 10521 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_RELATIVE); 10522 10523 /* Write the .got section contents for the sake 10524 of prelink. */ 10525 loc = got->contents + off; 10526 bfd_put_64 (output_bfd, outrel.r_addend + relocation, 10527 loc); 10528 } 10529 else 10530 outrel.r_info = ELF64_R_INFO (indx, R_PPC64_GLOB_DAT); 10531 10532 if (indx == 0 && tls_type != (TLS_TLS | TLS_LD)) 10533 { 10534 outrel.r_addend += relocation; 10535 if (tls_type & (TLS_GD | TLS_DTPREL | TLS_TPREL)) 10536 outrel.r_addend -= htab->elf.tls_sec->vma; 10537 } 10538 loc = relgot->contents; 10539 loc += (relgot->reloc_count++ 10540 * sizeof (Elf64_External_Rela)); 10541 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 10542 } 10543 10544 /* Init the .got section contents here if we're not 10545 emitting a reloc. */ 10546 else 10547 { 10548 relocation += addend; 10549 if (tls_type == (TLS_TLS | TLS_LD)) 10550 relocation = 1; 10551 else if (tls_type != 0) 10552 { 10553 relocation -= htab->elf.tls_sec->vma + DTP_OFFSET; 10554 if (tls_type == (TLS_TLS | TLS_TPREL)) 10555 relocation += DTP_OFFSET - TP_OFFSET; 10556 10557 if (tls_type == (TLS_TLS | TLS_GD)) 10558 { 10559 bfd_put_64 (output_bfd, relocation, 10560 got->contents + off + 8); 10561 relocation = 1; 10562 } 10563 } 10564 10565 bfd_put_64 (output_bfd, relocation, 10566 got->contents + off); 10567 } 10568 } 10569 10570 if (off >= (bfd_vma) -2) 10571 abort (); 10572 10573 relocation = got->output_offset + off; 10574 10575 /* TOC base (r2) is TOC start plus 0x8000. */ 10576 addend = -TOC_BASE_OFF; 10577 } 10578 break; 10579 10580 case R_PPC64_PLT16_HA: 10581 case R_PPC64_PLT16_HI: 10582 case R_PPC64_PLT16_LO: 10583 case R_PPC64_PLT32: 10584 case R_PPC64_PLT64: 10585 /* Relocation is to the entry for this symbol in the 10586 procedure linkage table. */ 10587 10588 /* Resolve a PLT reloc against a local symbol directly, 10589 without using the procedure linkage table. */ 10590 if (h == NULL) 10591 break; 10592 10593 /* It's possible that we didn't make a PLT entry for this 10594 symbol. This happens when statically linking PIC code, 10595 or when using -Bsymbolic. Go find a match if there is a 10596 PLT entry. */ 10597 if (htab->plt != NULL) 10598 { 10599 struct plt_entry *ent; 10600 for (ent = h->elf.plt.plist; ent != NULL; ent = ent->next) 10601 if (ent->addend == orig_addend 10602 && ent->plt.offset != (bfd_vma) -1) 10603 { 10604 relocation = (htab->plt->output_section->vma 10605 + htab->plt->output_offset 10606 + ent->plt.offset); 10607 unresolved_reloc = FALSE; 10608 } 10609 } 10610 break; 10611 10612 case R_PPC64_TOC: 10613 /* Relocation value is TOC base. */ 10614 relocation = TOCstart; 10615 if (r_symndx == 0) 10616 relocation += htab->stub_group[input_section->id].toc_off; 10617 else if (unresolved_reloc) 10618 ; 10619 else if (sec != NULL && sec->id <= htab->top_id) 10620 relocation += htab->stub_group[sec->id].toc_off; 10621 else 10622 unresolved_reloc = TRUE; 10623 goto dodyn2; 10624 10625 /* TOC16 relocs. We want the offset relative to the TOC base, 10626 which is the address of the start of the TOC plus 0x8000. 10627 The TOC consists of sections .got, .toc, .tocbss, and .plt, 10628 in this order. */ 10629 case R_PPC64_TOC16: 10630 case R_PPC64_TOC16_LO: 10631 case R_PPC64_TOC16_HI: 10632 case R_PPC64_TOC16_DS: 10633 case R_PPC64_TOC16_LO_DS: 10634 case R_PPC64_TOC16_HA: 10635 addend -= TOCstart + htab->stub_group[input_section->id].toc_off; 10636 break; 10637 10638 /* Relocate against the beginning of the section. */ 10639 case R_PPC64_SECTOFF: 10640 case R_PPC64_SECTOFF_LO: 10641 case R_PPC64_SECTOFF_HI: 10642 case R_PPC64_SECTOFF_DS: 10643 case R_PPC64_SECTOFF_LO_DS: 10644 case R_PPC64_SECTOFF_HA: 10645 if (sec != NULL) 10646 addend -= sec->output_section->vma; 10647 break; 10648 10649 case R_PPC64_REL14: 10650 case R_PPC64_REL14_BRNTAKEN: 10651 case R_PPC64_REL14_BRTAKEN: 10652 case R_PPC64_REL24: 10653 break; 10654 10655 case R_PPC64_TPREL16: 10656 case R_PPC64_TPREL16_LO: 10657 case R_PPC64_TPREL16_HI: 10658 case R_PPC64_TPREL16_HA: 10659 case R_PPC64_TPREL16_DS: 10660 case R_PPC64_TPREL16_LO_DS: 10661 case R_PPC64_TPREL16_HIGHER: 10662 case R_PPC64_TPREL16_HIGHERA: 10663 case R_PPC64_TPREL16_HIGHEST: 10664 case R_PPC64_TPREL16_HIGHESTA: 10665 addend -= htab->elf.tls_sec->vma + TP_OFFSET; 10666 if (info->shared) 10667 /* The TPREL16 relocs shouldn't really be used in shared 10668 libs as they will result in DT_TEXTREL being set, but 10669 support them anyway. */ 10670 goto dodyn; 10671 break; 10672 10673 case R_PPC64_DTPREL16: 10674 case R_PPC64_DTPREL16_LO: 10675 case R_PPC64_DTPREL16_HI: 10676 case R_PPC64_DTPREL16_HA: 10677 case R_PPC64_DTPREL16_DS: 10678 case R_PPC64_DTPREL16_LO_DS: 10679 case R_PPC64_DTPREL16_HIGHER: 10680 case R_PPC64_DTPREL16_HIGHERA: 10681 case R_PPC64_DTPREL16_HIGHEST: 10682 case R_PPC64_DTPREL16_HIGHESTA: 10683 addend -= htab->elf.tls_sec->vma + DTP_OFFSET; 10684 break; 10685 10686 case R_PPC64_DTPMOD64: 10687 relocation = 1; 10688 addend = 0; 10689 goto dodyn; 10690 10691 case R_PPC64_TPREL64: 10692 addend -= htab->elf.tls_sec->vma + TP_OFFSET; 10693 goto dodyn; 10694 10695 case R_PPC64_DTPREL64: 10696 addend -= htab->elf.tls_sec->vma + DTP_OFFSET; 10697 /* Fall thru */ 10698 10699 /* Relocations that may need to be propagated if this is a 10700 dynamic object. */ 10701 case R_PPC64_REL30: 10702 case R_PPC64_REL32: 10703 case R_PPC64_REL64: 10704 case R_PPC64_ADDR14: 10705 case R_PPC64_ADDR14_BRNTAKEN: 10706 case R_PPC64_ADDR14_BRTAKEN: 10707 case R_PPC64_ADDR16: 10708 case R_PPC64_ADDR16_DS: 10709 case R_PPC64_ADDR16_HA: 10710 case R_PPC64_ADDR16_HI: 10711 case R_PPC64_ADDR16_HIGHER: 10712 case R_PPC64_ADDR16_HIGHERA: 10713 case R_PPC64_ADDR16_HIGHEST: 10714 case R_PPC64_ADDR16_HIGHESTA: 10715 case R_PPC64_ADDR16_LO: 10716 case R_PPC64_ADDR16_LO_DS: 10717 case R_PPC64_ADDR24: 10718 case R_PPC64_ADDR32: 10719 case R_PPC64_ADDR64: 10720 case R_PPC64_UADDR16: 10721 case R_PPC64_UADDR32: 10722 case R_PPC64_UADDR64: 10723 /* r_symndx will be zero only for relocs against symbols 10724 from removed linkonce sections, or sections discarded by 10725 a linker script. */ 10726 dodyn: 10727 if (r_symndx == 0) 10728 break; 10729 /* Fall thru. */ 10730 10731 dodyn2: 10732 if ((input_section->flags & SEC_ALLOC) == 0) 10733 break; 10734 10735 if (NO_OPD_RELOCS && is_opd) 10736 break; 10737 10738 if ((info->shared 10739 && (h == NULL 10740 || ELF_ST_VISIBILITY (h->elf.other) == STV_DEFAULT 10741 || h->elf.root.type != bfd_link_hash_undefweak) 10742 && (MUST_BE_DYN_RELOC (r_type) 10743 || !SYMBOL_CALLS_LOCAL (info, &h->elf))) 10744 || (ELIMINATE_COPY_RELOCS 10745 && !info->shared 10746 && h != NULL 10747 && h->elf.dynindx != -1 10748 && !h->elf.non_got_ref 10749 && h->elf.def_dynamic 10750 && !h->elf.def_regular)) 10751 { 10752 Elf_Internal_Rela outrel; 10753 bfd_boolean skip, relocate; 10754 asection *sreloc; 10755 bfd_byte *loc; 10756 bfd_vma out_off; 10757 10758 /* When generating a dynamic object, these relocations 10759 are copied into the output file to be resolved at run 10760 time. */ 10761 10762 skip = FALSE; 10763 relocate = FALSE; 10764 10765 out_off = _bfd_elf_section_offset (output_bfd, info, 10766 input_section, rel->r_offset); 10767 if (out_off == (bfd_vma) -1) 10768 skip = TRUE; 10769 else if (out_off == (bfd_vma) -2) 10770 skip = TRUE, relocate = TRUE; 10771 out_off += (input_section->output_section->vma 10772 + input_section->output_offset); 10773 outrel.r_offset = out_off; 10774 outrel.r_addend = rel->r_addend; 10775 10776 /* Optimize unaligned reloc use. */ 10777 if ((r_type == R_PPC64_ADDR64 && (out_off & 7) != 0) 10778 || (r_type == R_PPC64_UADDR64 && (out_off & 7) == 0)) 10779 r_type ^= R_PPC64_ADDR64 ^ R_PPC64_UADDR64; 10780 else if ((r_type == R_PPC64_ADDR32 && (out_off & 3) != 0) 10781 || (r_type == R_PPC64_UADDR32 && (out_off & 3) == 0)) 10782 r_type ^= R_PPC64_ADDR32 ^ R_PPC64_UADDR32; 10783 else if ((r_type == R_PPC64_ADDR16 && (out_off & 1) != 0) 10784 || (r_type == R_PPC64_UADDR16 && (out_off & 1) == 0)) 10785 r_type ^= R_PPC64_ADDR16 ^ R_PPC64_UADDR16; 10786 10787 if (skip) 10788 memset (&outrel, 0, sizeof outrel); 10789 else if (!SYMBOL_REFERENCES_LOCAL (info, &h->elf) 10790 && !is_opd 10791 && r_type != R_PPC64_TOC) 10792 outrel.r_info = ELF64_R_INFO (h->elf.dynindx, r_type); 10793 else 10794 { 10795 /* This symbol is local, or marked to become local, 10796 or this is an opd section reloc which must point 10797 at a local function. */ 10798 outrel.r_addend += relocation; 10799 if (r_type == R_PPC64_ADDR64 || r_type == R_PPC64_TOC) 10800 { 10801 if (is_opd && h != NULL) 10802 { 10803 /* Lie about opd entries. This case occurs 10804 when building shared libraries and we 10805 reference a function in another shared 10806 lib. The same thing happens for a weak 10807 definition in an application that's 10808 overridden by a strong definition in a 10809 shared lib. (I believe this is a generic 10810 bug in binutils handling of weak syms.) 10811 In these cases we won't use the opd 10812 entry in this lib. */ 10813 unresolved_reloc = FALSE; 10814 } 10815 outrel.r_info = ELF64_R_INFO (0, R_PPC64_RELATIVE); 10816 10817 /* We need to relocate .opd contents for ld.so. 10818 Prelink also wants simple and consistent rules 10819 for relocs. This make all RELATIVE relocs have 10820 *r_offset equal to r_addend. */ 10821 relocate = TRUE; 10822 } 10823 else 10824 { 10825 long indx = 0; 10826 10827 if (bfd_is_abs_section (sec)) 10828 ; 10829 else if (sec == NULL || sec->owner == NULL) 10830 { 10831 bfd_set_error (bfd_error_bad_value); 10832 return FALSE; 10833 } 10834 else 10835 { 10836 asection *osec; 10837 10838 osec = sec->output_section; 10839 indx = elf_section_data (osec)->dynindx; 10840 10841 /* We are turning this relocation into one 10842 against a section symbol, so subtract out 10843 the output section's address but not the 10844 offset of the input section in the output 10845 section. */ 10846 outrel.r_addend -= osec->vma; 10847 } 10848 10849 outrel.r_info = ELF64_R_INFO (indx, r_type); 10850 } 10851 } 10852 10853 sreloc = elf_section_data (input_section)->sreloc; 10854 if (sreloc == NULL) 10855 abort (); 10856 10857 if (sreloc->reloc_count * sizeof (Elf64_External_Rela) 10858 >= sreloc->size) 10859 abort (); 10860 loc = sreloc->contents; 10861 loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela); 10862 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); 10863 10864 /* If this reloc is against an external symbol, it will 10865 be computed at runtime, so there's no need to do 10866 anything now. However, for the sake of prelink ensure 10867 that the section contents are a known value. */ 10868 if (! relocate) 10869 { 10870 unresolved_reloc = FALSE; 10871 /* The value chosen here is quite arbitrary as ld.so 10872 ignores section contents except for the special 10873 case of .opd where the contents might be accessed 10874 before relocation. Choose zero, as that won't 10875 cause reloc overflow. */ 10876 relocation = 0; 10877 addend = 0; 10878 /* Use *r_offset == r_addend for R_PPC64_ADDR64 relocs 10879 to improve backward compatibility with older 10880 versions of ld. */ 10881 if (r_type == R_PPC64_ADDR64) 10882 addend = outrel.r_addend; 10883 /* Adjust pc_relative relocs to have zero in *r_offset. */ 10884 else if (ppc64_elf_howto_table[r_type]->pc_relative) 10885 addend = (input_section->output_section->vma 10886 + input_section->output_offset 10887 + rel->r_offset); 10888 } 10889 } 10890 break; 10891 10892 case R_PPC64_COPY: 10893 case R_PPC64_GLOB_DAT: 10894 case R_PPC64_JMP_SLOT: 10895 case R_PPC64_RELATIVE: 10896 /* We shouldn't ever see these dynamic relocs in relocatable 10897 files. */ 10898 /* Fall through. */ 10899 10900 case R_PPC64_PLTGOT16: 10901 case R_PPC64_PLTGOT16_DS: 10902 case R_PPC64_PLTGOT16_HA: 10903 case R_PPC64_PLTGOT16_HI: 10904 case R_PPC64_PLTGOT16_LO: 10905 case R_PPC64_PLTGOT16_LO_DS: 10906 case R_PPC64_PLTREL32: 10907 case R_PPC64_PLTREL64: 10908 /* These ones haven't been implemented yet. */ 10909 10910 (*_bfd_error_handler) 10911 (_("%B: relocation %s is not supported for symbol %s."), 10912 input_bfd, 10913 ppc64_elf_howto_table[r_type]->name, sym_name); 10914 10915 bfd_set_error (bfd_error_invalid_operation); 10916 ret = FALSE; 10917 continue; 10918 } 10919 10920 /* Do any further special processing. */ 10921 switch (r_type) 10922 { 10923 default: 10924 break; 10925 10926 case R_PPC64_ADDR16_HA: 10927 case R_PPC64_ADDR16_HIGHERA: 10928 case R_PPC64_ADDR16_HIGHESTA: 10929 case R_PPC64_GOT16_HA: 10930 case R_PPC64_PLTGOT16_HA: 10931 case R_PPC64_PLT16_HA: 10932 case R_PPC64_TOC16_HA: 10933 case R_PPC64_SECTOFF_HA: 10934 case R_PPC64_TPREL16_HA: 10935 case R_PPC64_DTPREL16_HA: 10936 case R_PPC64_GOT_TLSGD16_HA: 10937 case R_PPC64_GOT_TLSLD16_HA: 10938 case R_PPC64_GOT_TPREL16_HA: 10939 case R_PPC64_GOT_DTPREL16_HA: 10940 case R_PPC64_TPREL16_HIGHER: 10941 case R_PPC64_TPREL16_HIGHERA: 10942 case R_PPC64_TPREL16_HIGHEST: 10943 case R_PPC64_TPREL16_HIGHESTA: 10944 case R_PPC64_DTPREL16_HIGHER: 10945 case R_PPC64_DTPREL16_HIGHERA: 10946 case R_PPC64_DTPREL16_HIGHEST: 10947 case R_PPC64_DTPREL16_HIGHESTA: 10948 /* It's just possible that this symbol is a weak symbol 10949 that's not actually defined anywhere. In that case, 10950 'sec' would be NULL, and we should leave the symbol 10951 alone (it will be set to zero elsewhere in the link). */ 10952 if (sec != NULL) 10953 /* Add 0x10000 if sign bit in 0:15 is set. 10954 Bits 0:15 are not used. */ 10955 addend += 0x8000; 10956 break; 10957 10958 case R_PPC64_ADDR16_DS: 10959 case R_PPC64_ADDR16_LO_DS: 10960 case R_PPC64_GOT16_DS: 10961 case R_PPC64_GOT16_LO_DS: 10962 case R_PPC64_PLT16_LO_DS: 10963 case R_PPC64_SECTOFF_DS: 10964 case R_PPC64_SECTOFF_LO_DS: 10965 case R_PPC64_TOC16_DS: 10966 case R_PPC64_TOC16_LO_DS: 10967 case R_PPC64_PLTGOT16_DS: 10968 case R_PPC64_PLTGOT16_LO_DS: 10969 case R_PPC64_GOT_TPREL16_DS: 10970 case R_PPC64_GOT_TPREL16_LO_DS: 10971 case R_PPC64_GOT_DTPREL16_DS: 10972 case R_PPC64_GOT_DTPREL16_LO_DS: 10973 case R_PPC64_TPREL16_DS: 10974 case R_PPC64_TPREL16_LO_DS: 10975 case R_PPC64_DTPREL16_DS: 10976 case R_PPC64_DTPREL16_LO_DS: 10977 insn = bfd_get_32 (input_bfd, contents + (rel->r_offset & ~3)); 10978 mask = 3; 10979 /* If this reloc is against an lq insn, then the value must be 10980 a multiple of 16. This is somewhat of a hack, but the 10981 "correct" way to do this by defining _DQ forms of all the 10982 _DS relocs bloats all reloc switches in this file. It 10983 doesn't seem to make much sense to use any of these relocs 10984 in data, so testing the insn should be safe. */ 10985 if ((insn & (0x3f << 26)) == (56u << 26)) 10986 mask = 15; 10987 if (((relocation + addend) & mask) != 0) 10988 { 10989 (*_bfd_error_handler) 10990 (_("%B: error: relocation %s not a multiple of %d"), 10991 input_bfd, 10992 ppc64_elf_howto_table[r_type]->name, 10993 mask + 1); 10994 bfd_set_error (bfd_error_bad_value); 10995 ret = FALSE; 10996 continue; 10997 } 10998 break; 10999 } 11000 11001 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections 11002 because such sections are not SEC_ALLOC and thus ld.so will 11003 not process them. */ 11004 if (unresolved_reloc 11005 && !((input_section->flags & SEC_DEBUGGING) != 0 11006 && h->elf.def_dynamic)) 11007 { 11008 (*_bfd_error_handler) 11009 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), 11010 input_bfd, 11011 input_section, 11012 (long) rel->r_offset, 11013 ppc64_elf_howto_table[(int) r_type]->name, 11014 h->elf.root.root.string); 11015 ret = FALSE; 11016 } 11017 11018 r = _bfd_final_link_relocate (ppc64_elf_howto_table[(int) r_type], 11019 input_bfd, 11020 input_section, 11021 contents, 11022 rel->r_offset, 11023 relocation, 11024 addend); 11025 11026 if (r != bfd_reloc_ok) 11027 { 11028 if (sym_name == NULL) 11029 sym_name = "(null)"; 11030 if (r == bfd_reloc_overflow) 11031 { 11032 if (warned) 11033 continue; 11034 if (h != NULL 11035 && h->elf.root.type == bfd_link_hash_undefweak 11036 && ppc64_elf_howto_table[r_type]->pc_relative) 11037 { 11038 /* Assume this is a call protected by other code that 11039 detects the symbol is undefined. If this is the case, 11040 we can safely ignore the overflow. If not, the 11041 program is hosed anyway, and a little warning isn't 11042 going to help. */ 11043 11044 continue; 11045 } 11046 11047 if (!((*info->callbacks->reloc_overflow) 11048 (info, (h ? &h->elf.root : NULL), sym_name, 11049 ppc64_elf_howto_table[r_type]->name, 11050 orig_addend, input_bfd, input_section, rel->r_offset))) 11051 return FALSE; 11052 } 11053 else 11054 { 11055 (*_bfd_error_handler) 11056 (_("%B(%A+0x%lx): %s reloc against `%s': error %d"), 11057 input_bfd, 11058 input_section, 11059 (long) rel->r_offset, 11060 ppc64_elf_howto_table[r_type]->name, 11061 sym_name, 11062 (int) r); 11063 ret = FALSE; 11064 } 11065 } 11066 } 11067 11068 /* If we're emitting relocations, then shortly after this function 11069 returns, reloc offsets and addends for this section will be 11070 adjusted. Worse, reloc symbol indices will be for the output 11071 file rather than the input. Save a copy of the relocs for 11072 opd_entry_value. */ 11073 if (is_opd && (info->emitrelocations || info->relocatable)) 11074 { 11075 bfd_size_type amt; 11076 amt = input_section->reloc_count * sizeof (Elf_Internal_Rela); 11077 rel = bfd_alloc (input_bfd, amt); 11078 BFD_ASSERT (ppc64_elf_tdata (input_bfd)->opd_relocs == NULL); 11079 ppc64_elf_tdata (input_bfd)->opd_relocs = rel; 11080 if (rel == NULL) 11081 return FALSE; 11082 memcpy (rel, relocs, amt); 11083 } 11084 return ret; 11085} 11086 11087/* Adjust the value of any local symbols in opd sections. */ 11088 11089static bfd_boolean 11090ppc64_elf_output_symbol_hook (struct bfd_link_info *info, 11091 const char *name ATTRIBUTE_UNUSED, 11092 Elf_Internal_Sym *elfsym, 11093 asection *input_sec, 11094 struct elf_link_hash_entry *h) 11095{ 11096 long *opd_adjust, adjust; 11097 bfd_vma value; 11098 11099 if (h != NULL) 11100 return TRUE; 11101 11102 opd_adjust = get_opd_info (input_sec); 11103 if (opd_adjust == NULL) 11104 return TRUE; 11105 11106 value = elfsym->st_value - input_sec->output_offset; 11107 if (!info->relocatable) 11108 value -= input_sec->output_section->vma; 11109 11110 adjust = opd_adjust[value / 8]; 11111 if (adjust == -1) 11112 elfsym->st_value = 0; 11113 else 11114 elfsym->st_value += adjust; 11115 return TRUE; 11116} 11117 11118/* Finish up dynamic symbol handling. We set the contents of various 11119 dynamic sections here. */ 11120 11121static bfd_boolean 11122ppc64_elf_finish_dynamic_symbol (bfd *output_bfd, 11123 struct bfd_link_info *info, 11124 struct elf_link_hash_entry *h, 11125 Elf_Internal_Sym *sym) 11126{ 11127 struct ppc_link_hash_table *htab; 11128 bfd *dynobj; 11129 struct plt_entry *ent; 11130 Elf_Internal_Rela rela; 11131 bfd_byte *loc; 11132 11133 htab = ppc_hash_table (info); 11134 dynobj = htab->elf.dynobj; 11135 11136 for (ent = h->plt.plist; ent != NULL; ent = ent->next) 11137 if (ent->plt.offset != (bfd_vma) -1) 11138 { 11139 /* This symbol has an entry in the procedure linkage 11140 table. Set it up. */ 11141 11142 if (htab->plt == NULL 11143 || htab->relplt == NULL 11144 || htab->glink == NULL) 11145 abort (); 11146 11147 /* Create a JMP_SLOT reloc to inform the dynamic linker to 11148 fill in the PLT entry. */ 11149 rela.r_offset = (htab->plt->output_section->vma 11150 + htab->plt->output_offset 11151 + ent->plt.offset); 11152 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_JMP_SLOT); 11153 rela.r_addend = ent->addend; 11154 11155 loc = htab->relplt->contents; 11156 loc += ((ent->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE 11157 * sizeof (Elf64_External_Rela)); 11158 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 11159 } 11160 11161 if (h->needs_copy) 11162 { 11163 Elf_Internal_Rela rela; 11164 bfd_byte *loc; 11165 11166 /* This symbol needs a copy reloc. Set it up. */ 11167 11168 if (h->dynindx == -1 11169 || (h->root.type != bfd_link_hash_defined 11170 && h->root.type != bfd_link_hash_defweak) 11171 || htab->relbss == NULL) 11172 abort (); 11173 11174 rela.r_offset = (h->root.u.def.value 11175 + h->root.u.def.section->output_section->vma 11176 + h->root.u.def.section->output_offset); 11177 rela.r_info = ELF64_R_INFO (h->dynindx, R_PPC64_COPY); 11178 rela.r_addend = 0; 11179 loc = htab->relbss->contents; 11180 loc += htab->relbss->reloc_count++ * sizeof (Elf64_External_Rela); 11181 bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); 11182 } 11183 11184 /* Mark some specially defined symbols as absolute. */ 11185 if (strcmp (h->root.root.string, "_DYNAMIC") == 0) 11186 sym->st_shndx = SHN_ABS; 11187 11188 return TRUE; 11189} 11190 11191/* Used to decide how to sort relocs in an optimal manner for the 11192 dynamic linker, before writing them out. */ 11193 11194static enum elf_reloc_type_class 11195ppc64_elf_reloc_type_class (const Elf_Internal_Rela *rela) 11196{ 11197 enum elf_ppc64_reloc_type r_type; 11198 11199 r_type = ELF64_R_TYPE (rela->r_info); 11200 switch (r_type) 11201 { 11202 case R_PPC64_RELATIVE: 11203 return reloc_class_relative; 11204 case R_PPC64_JMP_SLOT: 11205 return reloc_class_plt; 11206 case R_PPC64_COPY: 11207 return reloc_class_copy; 11208 default: 11209 return reloc_class_normal; 11210 } 11211} 11212 11213/* Finish up the dynamic sections. */ 11214 11215static bfd_boolean 11216ppc64_elf_finish_dynamic_sections (bfd *output_bfd, 11217 struct bfd_link_info *info) 11218{ 11219 struct ppc_link_hash_table *htab; 11220 bfd *dynobj; 11221 asection *sdyn; 11222 11223 htab = ppc_hash_table (info); 11224 dynobj = htab->elf.dynobj; 11225 sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); 11226 11227 if (htab->elf.dynamic_sections_created) 11228 { 11229 Elf64_External_Dyn *dyncon, *dynconend; 11230 11231 if (sdyn == NULL || htab->got == NULL) 11232 abort (); 11233 11234 dyncon = (Elf64_External_Dyn *) sdyn->contents; 11235 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size); 11236 for (; dyncon < dynconend; dyncon++) 11237 { 11238 Elf_Internal_Dyn dyn; 11239 asection *s; 11240 11241 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); 11242 11243 switch (dyn.d_tag) 11244 { 11245 default: 11246 continue; 11247 11248 case DT_PPC64_GLINK: 11249 s = htab->glink; 11250 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 11251 /* We stupidly defined DT_PPC64_GLINK to be the start 11252 of glink rather than the first entry point, which is 11253 what ld.so needs, and now have a bigger stub to 11254 support automatic multiple TOCs. */ 11255 dyn.d_un.d_ptr += GLINK_CALL_STUB_SIZE - 32; 11256 break; 11257 11258 case DT_PPC64_OPD: 11259 s = bfd_get_section_by_name (output_bfd, ".opd"); 11260 if (s == NULL) 11261 continue; 11262 dyn.d_un.d_ptr = s->vma; 11263 break; 11264 11265 case DT_PPC64_OPDSZ: 11266 s = bfd_get_section_by_name (output_bfd, ".opd"); 11267 if (s == NULL) 11268 continue; 11269 dyn.d_un.d_val = s->size; 11270 break; 11271 11272 case DT_PLTGOT: 11273 s = htab->plt; 11274 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 11275 break; 11276 11277 case DT_JMPREL: 11278 s = htab->relplt; 11279 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; 11280 break; 11281 11282 case DT_PLTRELSZ: 11283 dyn.d_un.d_val = htab->relplt->size; 11284 break; 11285 11286 case DT_RELASZ: 11287 /* Don't count procedure linkage table relocs in the 11288 overall reloc count. */ 11289 s = htab->relplt; 11290 if (s == NULL) 11291 continue; 11292 dyn.d_un.d_val -= s->size; 11293 break; 11294 11295 case DT_RELA: 11296 /* We may not be using the standard ELF linker script. 11297 If .rela.plt is the first .rela section, we adjust 11298 DT_RELA to not include it. */ 11299 s = htab->relplt; 11300 if (s == NULL) 11301 continue; 11302 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset) 11303 continue; 11304 dyn.d_un.d_ptr += s->size; 11305 break; 11306 } 11307 11308 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); 11309 } 11310 } 11311 11312 if (htab->got != NULL && htab->got->size != 0) 11313 { 11314 /* Fill in the first entry in the global offset table. 11315 We use it to hold the link-time TOCbase. */ 11316 bfd_put_64 (output_bfd, 11317 elf_gp (output_bfd) + TOC_BASE_OFF, 11318 htab->got->contents); 11319 11320 /* Set .got entry size. */ 11321 elf_section_data (htab->got->output_section)->this_hdr.sh_entsize = 8; 11322 } 11323 11324 if (htab->plt != NULL && htab->plt->size != 0) 11325 { 11326 /* Set .plt entry size. */ 11327 elf_section_data (htab->plt->output_section)->this_hdr.sh_entsize 11328 = PLT_ENTRY_SIZE; 11329 } 11330 11331 /* We need to handle writing out multiple GOT sections ourselves, 11332 since we didn't add them to DYNOBJ. We know dynobj is the first 11333 bfd. */ 11334 while ((dynobj = dynobj->link_next) != NULL) 11335 { 11336 asection *s; 11337 11338 if (!is_ppc64_elf_target (dynobj->xvec)) 11339 continue; 11340 11341 s = ppc64_elf_tdata (dynobj)->got; 11342 if (s != NULL 11343 && s->size != 0 11344 && s->output_section != bfd_abs_section_ptr 11345 && !bfd_set_section_contents (output_bfd, s->output_section, 11346 s->contents, s->output_offset, 11347 s->size)) 11348 return FALSE; 11349 s = ppc64_elf_tdata (dynobj)->relgot; 11350 if (s != NULL 11351 && s->size != 0 11352 && s->output_section != bfd_abs_section_ptr 11353 && !bfd_set_section_contents (output_bfd, s->output_section, 11354 s->contents, s->output_offset, 11355 s->size)) 11356 return FALSE; 11357 } 11358 11359 return TRUE; 11360} 11361 11362#include "elf64-target.h" 11363