bfd/elfxx-x86.h

   1 /* x86 specific support for ELF
   2    Copyright (C) 2017 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include "bfd.h"
  23 #include "bfdlink.h"
  24 #include "libbfd.h"
  25 #include "elf-bfd.h"
  26 #include "bfd_stdint.h"
  27 #include "hashtab.h"
  28
  29 #define PLT_CIE_LENGTH          20
  30 #define PLT_FDE_LENGTH          36
  31 #define PLT_FDE_START_OFFSET    4 + PLT_CIE_LENGTH + 8
  32 #define PLT_FDE_LEN_OFFSET      4 + PLT_CIE_LENGTH + 12
  33
  34 #define ABI_64_P(abfd) \
  35   (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
  36
  37 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
  38    copying dynamic variables from a shared lib into an app's dynbss
  39    section, and instead use a dynamic relocation to point into the
  40    shared lib.  */
  41 #define ELIMINATE_COPY_RELOCS 1
  42
  43 #define elf_x86_hash_table(p, id) \
  44   (is_elf_hash_table ((p)->hash) \
  45    && elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \
  46     ? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL)
  47
  48 /* Will references to this symbol always be local in this object?  */
  49 #define SYMBOL_REFERENCES_LOCAL_P(INFO, H) \
  50   _bfd_x86_elf_link_symbol_references_local ((INFO), (H))
  51
  52 /* Is a undefined weak symbol which is resolved to 0.  Reference to an
  53    undefined weak symbol is resolved to 0 when building executable if
  54    it isn't dynamic and
  55    1. Has non-GOT/non-PLT relocations in text section.  Or
  56    2. Has no GOT/PLT relocation.
  57    Local undefined weak symbol is always resolved to 0.
  58  */
  59 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
  60   ((EH)->elf.root.type == bfd_link_hash_undefweak                \
  61    && (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf)            \
  62        || (bfd_link_executable (INFO)                            \
  63            && (!(EH)->has_got_reloc                              \
  64                || (EH)->has_non_got_reloc))))
  65
  66 /* Should copy relocation be generated for a symbol.  Don't generate
  67    copy relocation against a protected symbol defined in a shared
  68    object with GNU_PROPERTY_NO_COPY_ON_PROTECTED.  */
  69 #define SYMBOL_NO_COPYRELOC(INFO, EH) \
  70   ((EH)->def_protected \
  71    && ((EH)->elf.root.type == bfd_link_hash_defined \
  72        || (EH)->elf.root.type == bfd_link_hash_defweak) \
  73    && elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \
  74    && ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \
  75    && ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0)
  76
  77 /* TRUE if dynamic relocation is needed.  If we are creating a shared
  78    library, and this is a reloc against a global symbol, or a non PC
  79    relative reloc against a local symbol, then we need to copy the reloc
  80    into the shared library.  However, if we are linking with -Bsymbolic,
  81    we do not need to copy a reloc against a global symbol which is
  82    defined in an object we are including in the link (i.e., DEF_REGULAR
  83    is set).  At this point we have not seen all the input files, so it
  84    is possible that DEF_REGULAR is not set now but will be set later (it
  85    is never cleared).  In case of a weak definition, DEF_REGULAR may be
  86    cleared later by a strong definition in a shared library.  We account
  87    for that possibility below by storing information in the relocs_copied
  88    field of the hash table entry.  A similar situation occurs when
  89    creating shared libraries and symbol visibility changes render the
  90    symbol local.
  91
  92    If on the other hand, we are creating an executable, we may need to
  93    keep relocations for symbols satisfied by a dynamic library if we
  94    manage to avoid copy relocs for the symbol.
  95
  96    We also need to generate dynamic pointer relocation against
  97    STT_GNU_IFUNC symbol in the non-code section.  */
  98 #define NEED_DYNAMIC_RELOCATION_P(INFO, H, SEC, R_TYPE, POINTER_TYPE) \
  99   ((bfd_link_pic (INFO) \
 100     && (! X86_PCREL_TYPE_P (R_TYPE) \
 101         || ((H) != NULL \
 102             && (! (bfd_link_pie (INFO) \
 103                    || SYMBOLIC_BIND ((INFO), (H))) \
 104                 || (H)->root.type == bfd_link_hash_defweak \
 105                 || !(H)->def_regular)))) \
 106                 || ((H) != NULL \
 107                     && (H)->type == STT_GNU_IFUNC \
 108                     && (R_TYPE) == POINTER_TYPE \
 109                     && ((SEC)->flags & SEC_CODE) == 0) \
 110                     || (ELIMINATE_COPY_RELOCS \
 111                         && !bfd_link_pic (INFO) \
 112                         && (H) != NULL \
 113                         && ((H)->root.type == bfd_link_hash_defweak \
 114                             || !(H)->def_regular)))
 115
 116 /* TRUE if TLS IE->LE transition is OK.  */
 117 #define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \
 118   (bfd_link_executable (INFO) \
 119    && (H) != NULL \
 120    && (H)->dynindx == -1 \
 121    && (TLS_TYPE & GOT_TLS_IE))
 122
 123 /* x86 ELF linker hash entry.  */
 124
 125 struct elf_x86_link_hash_entry
 126 {
 127   struct elf_link_hash_entry elf;
 128
 129   /* Track dynamic relocs copied for this symbol.  */
 130   struct elf_dyn_relocs *dyn_relocs;
 131
 132   unsigned char tls_type;
 133
 134   /* TRUE if symbol has GOT or PLT relocations.  */
 135   unsigned int has_got_reloc : 1;
 136
 137   /* TRUE if symbol has non-GOT/non-PLT relocations in text sections.  */
 138   unsigned int has_non_got_reloc : 1;
 139
 140   /* Don't call finish_dynamic_symbol on this symbol.  */
 141   unsigned int no_finish_dynamic_symbol : 1;
 142
 143   /* TRUE if symbol is __tls_get_addr.  */
 144   unsigned int tls_get_addr : 1;
 145
 146   /* TRUE if symbol is defined as a protected symbol.  */
 147   unsigned int def_protected : 1;
 148
 149   /* 0: Symbol references are unknown.
 150      1: Symbol references aren't local.
 151      2: Symbol references are local.
 152    */
 153   unsigned int local_ref : 2;
 154
 155   /* TRUE if symbol is defined by linker.  */
 156   unsigned int linker_def : 1;
 157
 158   /* TRUE if symbol is referenced by R_386_GOTOFF relocation.  This is
 159      only used by i386.  */
 160   unsigned int gotoff_ref : 1;
 161
 162   /* TRUE if a weak symbol with a real definition needs a copy reloc.
 163      When there is a weak symbol with a real definition, the processor
 164      independent code will have arranged for us to see the real
 165      definition first.  We need to copy the needs_copy bit from the
 166      real definition and check it when allowing copy reloc in PIE.  This
 167      is only used by x86-64.  */
 168   unsigned int needs_copy : 1;
 169
 170   /* Reference count of C/C++ function pointer relocations in read-write
 171      section which can be resolved at run-time.  */
 172   bfd_signed_vma func_pointer_refcount;
 173
 174   /* Information about the GOT PLT entry. Filled when there are both
 175      GOT and PLT relocations against the same function.  */
 176   union gotplt_union plt_got;
 177
 178   /* Information about the second PLT entry.   */
 179   union gotplt_union plt_second;
 180
 181   /* Offset of the GOTPLT entry reserved for the TLS descriptor,
 182      starting at the end of the jump table.  */
 183   bfd_vma tlsdesc_got;
 184 };
 185
 186 struct elf_x86_lazy_plt_layout
 187 {
 188   /* The first entry in an absolute lazy procedure linkage table looks
 189      like this.  */
 190   const bfd_byte *plt0_entry;
 191   unsigned int plt0_entry_size;          /* Size of PLT0 entry.  */
 192
 193   /* Later entries in an absolute lazy procedure linkage table look
 194      like this.  */
 195   const bfd_byte *plt_entry;
 196   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 197
 198   /* Offsets into plt0_entry that are to be replaced with GOT[1] and
 199      GOT[2].  */
 200   unsigned int plt0_got1_offset;
 201   unsigned int plt0_got2_offset;
 202
 203   /* Offset of the end of the PC-relative instruction containing
 204      plt0_got2_offset.  This is for x86-64 only.  */
 205   unsigned int plt0_got2_insn_end;
 206
 207   /* Offsets into plt_entry that are to be replaced with...  */
 208   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 209   unsigned int plt_reloc_offset;  /* ... offset into relocation table. */
 210   unsigned int plt_plt_offset;    /* ... offset to start of .plt. */
 211
 212   /* Length of the PC-relative instruction containing plt_got_offset.
 213      This is used for x86-64 only.  */
 214   unsigned int plt_got_insn_size;
 215
 216   /* Offset of the end of the PC-relative jump to plt0_entry.  This is
 217      used for x86-64 only.  */
 218   unsigned int plt_plt_insn_end;
 219
 220   /* Offset into plt_entry where the initial value of the GOT entry
 221      points.  */
 222   unsigned int plt_lazy_offset;
 223
 224   /* The first entry in a PIC lazy procedure linkage table looks like
 225      this.  */
 226   const bfd_byte *pic_plt0_entry;
 227
 228   /* Subsequent entries in a PIC lazy procedure linkage table look
 229      like this.  */
 230   const bfd_byte *pic_plt_entry;
 231
 232   /* .eh_frame covering the lazy .plt section.  */
 233   const bfd_byte *eh_frame_plt;
 234   unsigned int eh_frame_plt_size;
 235 };
 236
 237 struct elf_x86_non_lazy_plt_layout
 238 {
 239   /* Entries in an absolute non-lazy procedure linkage table look like
 240      this.  */
 241   const bfd_byte *plt_entry;
 242   /* Entries in a PIC non-lazy procedure linkage table look like this.  */
 243   const bfd_byte *pic_plt_entry;
 244
 245   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 246
 247   /* Offsets into plt_entry that are to be replaced with...  */
 248   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 249
 250   /* Length of the PC-relative instruction containing plt_got_offset.
 251      This is used for x86-64 only.  */
 252   unsigned int plt_got_insn_size;
 253
 254   /* .eh_frame covering the non-lazy .plt section.  */
 255   const bfd_byte *eh_frame_plt;
 256   unsigned int eh_frame_plt_size;
 257 };
 258
 259 struct elf_x86_plt_layout
 260 {
 261   /* The first entry in a lazy procedure linkage table looks like this.
 262      This is only used for i386 where absolute PLT0 and PIC PLT0 are
 263      different.  */
 264   const bfd_byte *plt0_entry;
 265   /* Entries in a procedure linkage table look like this.  */
 266   const bfd_byte *plt_entry;
 267   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 268
 269   /* 1 has PLT0.  */
 270   unsigned int has_plt0;
 271
 272   /* Offsets into plt_entry that are to be replaced with...  */
 273   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 274
 275   /* Length of the PC-relative instruction containing plt_got_offset.
 276      This is only used for x86-64.  */
 277   unsigned int plt_got_insn_size;
 278
 279   /* .eh_frame covering the .plt section.  */
 280   const bfd_byte *eh_frame_plt;
 281   unsigned int eh_frame_plt_size;
 282 };
 283
 284 /* Values in tls_type of x86 ELF linker hash entry.  */
 285 #define GOT_UNKNOWN     0
 286 #define GOT_NORMAL      1
 287 #define GOT_TLS_GD      2
 288 #define GOT_TLS_IE      4
 289 #define GOT_TLS_IE_POS  5
 290 #define GOT_TLS_IE_NEG  6
 291 #define GOT_TLS_IE_BOTH 7
 292 #define GOT_TLS_GDESC   8
 293 #define GOT_TLS_GD_BOTH_P(type) \
 294   ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
 295 #define GOT_TLS_GD_P(type) \
 296   ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
 297 #define GOT_TLS_GDESC_P(type) \
 298   ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
 299 #define GOT_TLS_GD_ANY_P(type) \
 300   (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
 301
 302 #define elf_x86_hash_entry(ent) \
 303   ((struct elf_x86_link_hash_entry *)(ent))
 304
 305 /* x86 ELF linker hash table.  */
 306
 307 struct elf_x86_link_hash_table
 308 {
 309   struct elf_link_hash_table elf;
 310
 311   /* Short-cuts to get to dynamic linker sections.  */
 312   asection *interp;
 313   asection *plt_eh_frame;
 314   asection *plt_second;
 315   asection *plt_second_eh_frame;
 316   asection *plt_got;
 317   asection *plt_got_eh_frame;
 318
 319   /* Parameters describing PLT generation, lazy or non-lazy.  */
 320   struct elf_x86_plt_layout plt;
 321
 322   /* Parameters describing lazy PLT generation.  */
 323   const struct elf_x86_lazy_plt_layout *lazy_plt;
 324
 325   /* Parameters describing non-lazy PLT generation.  */
 326   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 327
 328   union
 329   {
 330     bfd_signed_vma refcount;
 331     bfd_vma offset;
 332   } tls_ld_or_ldm_got;
 333
 334   /* The amount of space used by the jump slots in the GOT.  */
 335   bfd_vma sgotplt_jump_table_size;
 336
 337   /* Small local sym cache.  */
 338   struct sym_cache sym_cache;
 339
 340   /* _TLS_MODULE_BASE_ symbol.  */
 341   struct bfd_link_hash_entry *tls_module_base;
 342
 343   /* Used by local STT_GNU_IFUNC symbols.  */
 344   htab_t loc_hash_table;
 345   void * loc_hash_memory;
 346
 347   /* The offset into sgot of the GOT entry used by the PLT entry
 348      above.  */
 349   bfd_vma tlsdesc_got;
 350
 351   /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt.  */
 352   bfd_vma next_jump_slot_index;
 353   /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt.  */
 354   bfd_vma next_irelative_index;
 355
 356   /* TRUE if there are dynamic relocs against IFUNC symbols that apply
 357      to read-only sections.  */
 358   bfd_boolean readonly_dynrelocs_against_ifunc;
 359
 360   /* TRUE if this is a VxWorks x86 target.  This is only used for
 361      i386.  */
 362   bfd_boolean is_vxworks;
 363
 364   /* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
 365      This is used for i386 only.  */
 366   asection *srelplt2;
 367
 368   /* The index of the next unused R_386_TLS_DESC slot in .rel.plt.  This
 369      is only used for i386.  */
 370   bfd_vma next_tls_desc_index;
 371
 372   /* The offset into splt of the PLT entry for the TLS descriptor
 373      resolver.  Special values are 0, if not necessary (or not found
 374      to be necessary yet), and -1 if needed but not determined
 375      yet.  This is only used for x86-64.  */
 376   bfd_vma tlsdesc_plt;
 377
 378   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 379   bfd_vma (*r_sym) (bfd_vma);
 380   bfd_boolean (*is_reloc_section) (const char *);
 381   enum elf_target_id target_id;
 382   unsigned int sizeof_reloc;
 383   unsigned int dt_reloc;
 384   unsigned int dt_reloc_sz;
 385   unsigned int dt_reloc_ent;
 386   unsigned int got_entry_size;
 387   unsigned int pointer_r_type;
 388   int dynamic_interpreter_size;
 389   const char *dynamic_interpreter;
 390   const char *tls_get_addr;
 391 };
 392
 393 struct elf_x86_init_table
 394 {
 395   /* The lazy PLT layout.  */
 396   const struct elf_x86_lazy_plt_layout *lazy_plt;
 397
 398   /* The non-lazy PLT layout.  */
 399   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 400
 401   /* The lazy PLT layout for IBT.  */
 402   const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
 403
 404   /* The non-lazy PLT layout for IBT.  */
 405   const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
 406
 407   /* TRUE if this is a normal x86 target.  */
 408   bfd_boolean normal_target;
 409
 410   /* TRUE if this is a VxWorks x86 target.  */
 411   bfd_boolean is_vxworks;
 412
 413   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 414   bfd_vma (*r_sym) (bfd_vma);
 415 };
 416
 417 struct elf_x86_obj_tdata
 418 {
 419   struct elf_obj_tdata root;
 420
 421   /* tls_type for each local got entry.  */
 422   char *local_got_tls_type;
 423
 424   /* GOTPLT entries for TLS descriptors.  */
 425   bfd_vma *local_tlsdesc_gotent;
 426 };
 427
 428 enum elf_x86_plt_type
 429 {
 430   plt_non_lazy = 0,
 431   plt_lazy = 1 << 0,
 432   plt_pic = 1 << 1,
 433   plt_second = 1 << 2,
 434   plt_unknown = -1
 435 };
 436
 437 struct elf_x86_plt
 438 {
 439   const char *name;
 440   asection *sec;
 441   bfd_byte *contents;
 442   enum elf_x86_plt_type type;
 443   unsigned int plt_got_offset;
 444   unsigned int plt_entry_size;
 445   unsigned int plt_got_insn_size;       /* Only used for x86-64.  */
 446   long count;
 447 };
 448
 449 #define elf_x86_tdata(abfd) \
 450   ((struct elf_x86_obj_tdata *) (abfd)->tdata.any)
 451
 452 #define elf_x86_local_got_tls_type(abfd) \
 453   (elf_x86_tdata (abfd)->local_got_tls_type)
 454
 455 #define elf_x86_local_tlsdesc_gotent(abfd) \
 456   (elf_x86_tdata (abfd)->local_tlsdesc_gotent)
 457
 458 #define elf_x86_compute_jump_table_size(htab) \
 459   ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)
 460
 461 #define is_x86_elf(bfd, htab)                           \
 462   (bfd_get_flavour (bfd) == bfd_target_elf_flavour      \
 463    && elf_tdata (bfd) != NULL                           \
 464    && elf_object_id (bfd) == (htab)->target_id)
 465
 466 extern bfd_boolean _bfd_x86_elf_mkobject
 467   (bfd *);
 468
 469 extern void _bfd_x86_elf_set_tls_module_base
 470   (struct bfd_link_info *);
 471
 472 extern bfd_vma _bfd_x86_elf_dtpoff_base
 473   (struct bfd_link_info *);
 474
 475 extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
 476   (struct elf_link_hash_entry *, void *);
 477
 478 extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
 479   (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *,
 480    bfd_boolean);
 481
 482 extern hashval_t _bfd_x86_elf_local_htab_hash
 483   (const void *);
 484
 485 extern int _bfd_x86_elf_local_htab_eq
 486   (const void *, const void *);
 487
 488 extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
 489   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 490
 491 extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
 492   (bfd *);
 493
 494 extern int _bfd_x86_elf_compare_relocs
 495   (const void *, const void *);
 496
 497 extern bfd_boolean _bfd_x86_elf_link_check_relocs
 498   (bfd *, struct bfd_link_info *);
 499
 500 extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
 501   (bfd *, struct bfd_link_info *);
 502
 503 extern bfd_boolean _bfd_x86_elf_always_size_sections
 504   (bfd *, struct bfd_link_info *);
 505
 506 extern void _bfd_x86_elf_merge_symbol_attribute
 507   (struct elf_link_hash_entry *, const Elf_Internal_Sym *,
 508    bfd_boolean, bfd_boolean);
 509
 510 extern void _bfd_x86_elf_copy_indirect_symbol
 511   (struct bfd_link_info *, struct elf_link_hash_entry *,
 512    struct elf_link_hash_entry *);
 513
 514 extern bfd_boolean _bfd_x86_elf_fixup_symbol
 515   (struct bfd_link_info *, struct elf_link_hash_entry *);
 516
 517 extern bfd_boolean _bfd_x86_elf_hash_symbol
 518   (struct elf_link_hash_entry *);
 519
 520 extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
 521   (struct bfd_link_info *, struct elf_link_hash_entry *);
 522
 523 extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
 524   (struct bfd_link_info *, struct elf_link_hash_entry *);
 525
 526 extern asection * _bfd_x86_elf_gc_mark_hook
 527   (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
 528    struct elf_link_hash_entry *, Elf_Internal_Sym *);
 529
 530 extern long _bfd_x86_elf_get_synthetic_symtab
 531   (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **,
 532    asymbol **);
 533
 534 extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
 535   (bfd *, unsigned int, bfd_byte *, unsigned int);
 536
 537 extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
 538   (struct bfd_link_info *, bfd *, elf_property *, elf_property *);
 539
 540 extern bfd * _bfd_x86_elf_link_setup_gnu_properties
 541   (struct bfd_link_info *, struct elf_x86_init_table *);
 542
 543 #define bfd_elf64_mkobject \
 544   _bfd_x86_elf_mkobject
 545 #define bfd_elf32_mkobject \
 546   _bfd_x86_elf_mkobject
 547 #define bfd_elf64_bfd_link_hash_table_create \
 548   _bfd_x86_elf_link_hash_table_create
 549 #define bfd_elf32_bfd_link_hash_table_create \
 550   _bfd_x86_elf_link_hash_table_create
 551 #define bfd_elf64_bfd_link_check_relocs \
 552   _bfd_x86_elf_link_check_relocs
 553 #define bfd_elf32_bfd_link_check_relocs \
 554   _bfd_x86_elf_link_check_relocs
 555
 556 #define elf_backend_size_dynamic_sections \
 557   _bfd_x86_elf_size_dynamic_sections
 558 #define elf_backend_always_size_sections \
 559   _bfd_x86_elf_always_size_sections
 560 #define elf_backend_merge_symbol_attribute \
 561   _bfd_x86_elf_merge_symbol_attribute
 562 #define elf_backend_copy_indirect_symbol \
 563   _bfd_x86_elf_copy_indirect_symbol
 564 #define elf_backend_fixup_symbol \
 565   _bfd_x86_elf_fixup_symbol
 566 #define elf_backend_hash_symbol \
 567   _bfd_x86_elf_hash_symbol
 568 #define elf_backend_adjust_dynamic_symbol \
 569   _bfd_x86_elf_adjust_dynamic_symbol
 570 #define elf_backend_gc_mark_hook \
 571   _bfd_x86_elf_gc_mark_hook
 572 #define elf_backend_omit_section_dynsym \
 573   ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
 574 #define elf_backend_parse_gnu_properties \
 575   _bfd_x86_elf_parse_gnu_properties
 576 #define elf_backend_merge_gnu_properties \
 577   _bfd_x86_elf_merge_gnu_properties