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 dynamic relocation should be generated.  Don't copy a
 117    pc-relative relocation into the output file if the symbol needs
 118    copy reloc or the symbol is undefined when building executable.
 119    Copy dynamic function pointer relocations.  Don't generate dynamic
 120    relocations against resolved undefined weak symbols in PIE, except
 121    when PC32_RELOC is TRUE.  Undefined weak symbol is bound locally
 122    when PIC is false.  */
 123 #define GENERATE_DYNAMIC_RELOCATION_P(INFO, EH, R_TYPE, \
 124                                       NEED_COPY_RELOC_IN_PIE, \
 125                                       RESOLVED_TO_ZERO, PC32_RELOC) \
 126   ((bfd_link_pic (INFO) \
 127     && !(NEED_COPY_RELOC_IN_PIE) \
 128     && ((EH) == NULL \
 129         || ((ELF_ST_VISIBILITY ((EH)->elf.other) == STV_DEFAULT \
 130              && (!(RESOLVED_TO_ZERO) || PC32_RELOC)) \
 131             || (EH)->elf.root.type != bfd_link_hash_undefweak)) \
 132     && ((!X86_PCREL_TYPE_P (R_TYPE) \
 133          && !X86_SIZE_TYPE_P (R_TYPE)) \
 134          || ! SYMBOL_CALLS_LOCAL ((INFO), &(EH)->elf))) \
 135    || (ELIMINATE_COPY_RELOCS \
 136        && !bfd_link_pic (INFO) \
 137        && (EH) != NULL \
 138        && (EH)->elf.dynindx != -1 \
 139        && (!(EH)->elf.non_got_ref \
 140            || (EH)->func_pointer_refcount > 0 \
 141            || ((EH)->elf.root.type == bfd_link_hash_undefweak \
 142                && !(RESOLVED_TO_ZERO))) \
 143                && (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \
 144                    || (EH)->elf.root.type == bfd_link_hash_undefined)))
 145
 146 /* TRUE if this input relocation should be copied to output.  H->dynindx
 147    may be -1 if this symbol was marked to become local.  */
 148 #define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \
 149   ((H) != NULL \
 150    && (H)->dynindx != -1 \
 151    && (X86_PCREL_TYPE_P (R_TYPE) \
 152        || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \
 153        || !(H)->def_regular))
 154
 155 /* TRUE if this is actually a static link, or it is a -Bsymbolic link
 156    and the symbol is defined locally, or the symbol was forced to be
 157    local because of a version file.  */
 158 #define RESOLVED_LOCALLY_P(INFO, H, HTAB) \
 159   (!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \
 160                                      bfd_link_pic (INFO), (H)) \
 161    || (bfd_link_pic (INFO) \
 162        && SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \
 163        || (ELF_ST_VISIBILITY ((H)->other) \
 164            && (H)->root.type == bfd_link_hash_undefweak))
 165
 166 /* TRUE if relative relocation should be generated.  GOT reference to
 167    global symbol in PIC will lead to dynamic symbol.  It becomes a
 168    problem when "time" or "times" is defined as a variable in an
 169    executable, clashing with functions of the same name in libc.  If a
 170    symbol isn't undefined weak symbol, don't make it dynamic in PIC and
 171    generate relative relocation.  */
 172 #define GENERATE_RELATIVE_RELOC_P(INFO, H) \
 173   ((H)->dynindx == -1 \
 174    && !(H)->forced_local \
 175    && (H)->root.type != bfd_link_hash_undefweak \
 176    && bfd_link_pic (INFO))
 177
 178 /* TRUE if this is a pointer reference to a local IFUNC.  */
 179 #define POINTER_LOCAL_IFUNC_P(INFO, H) \
 180   ((H)->dynindx == -1 \
 181    || (H)->forced_local \
 182    || bfd_link_executable (INFO))
 183
 184 /* TRUE if this is a PLT reference to a local IFUNC.  */
 185 #define PLT_LOCAL_IFUNC_P(INFO, H) \
 186   ((H)->dynindx == -1 \
 187    || ((bfd_link_executable (INFO) \
 188         || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \
 189         && (H)->def_regular \
 190         && (H)->type == STT_GNU_IFUNC))
 191
 192 /* TRUE if TLS IE->LE transition is OK.  */
 193 #define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \
 194   (bfd_link_executable (INFO) \
 195    && (H) != NULL \
 196    && (H)->dynindx == -1 \
 197    && (TLS_TYPE & GOT_TLS_IE))
 198
 199 /* x86 ELF linker hash entry.  */
 200
 201 struct elf_x86_link_hash_entry
 202 {
 203   struct elf_link_hash_entry elf;
 204
 205   /* Track dynamic relocs copied for this symbol.  */
 206   struct elf_dyn_relocs *dyn_relocs;
 207
 208   unsigned char tls_type;
 209
 210   /* TRUE if symbol has GOT or PLT relocations.  */
 211   unsigned int has_got_reloc : 1;
 212
 213   /* TRUE if symbol has non-GOT/non-PLT relocations in text sections.  */
 214   unsigned int has_non_got_reloc : 1;
 215
 216   /* Don't call finish_dynamic_symbol on this symbol.  */
 217   unsigned int no_finish_dynamic_symbol : 1;
 218
 219   /* TRUE if symbol is __tls_get_addr.  */
 220   unsigned int tls_get_addr : 1;
 221
 222   /* TRUE if symbol is defined as a protected symbol.  */
 223   unsigned int def_protected : 1;
 224
 225   /* 0: Symbol references are unknown.
 226      1: Symbol references aren't local.
 227      2: Symbol references are local.
 228    */
 229   unsigned int local_ref : 2;
 230
 231   /* TRUE if symbol is defined by linker.  */
 232   unsigned int linker_def : 1;
 233
 234   /* TRUE if symbol is referenced by R_386_GOTOFF relocation.  This is
 235      only used by i386.  */
 236   unsigned int gotoff_ref : 1;
 237
 238   /* TRUE if a weak symbol with a real definition needs a copy reloc.
 239      When there is a weak symbol with a real definition, the processor
 240      independent code will have arranged for us to see the real
 241      definition first.  We need to copy the needs_copy bit from the
 242      real definition and check it when allowing copy reloc in PIE.  This
 243      is only used by x86-64.  */
 244   unsigned int needs_copy : 1;
 245
 246   /* Reference count of C/C++ function pointer relocations in read-write
 247      section which can be resolved at run-time.  */
 248   bfd_signed_vma func_pointer_refcount;
 249
 250   /* Information about the GOT PLT entry. Filled when there are both
 251      GOT and PLT relocations against the same function.  */
 252   union gotplt_union plt_got;
 253
 254   /* Information about the second PLT entry.   */
 255   union gotplt_union plt_second;
 256
 257   /* Offset of the GOTPLT entry reserved for the TLS descriptor,
 258      starting at the end of the jump table.  */
 259   bfd_vma tlsdesc_got;
 260 };
 261
 262 struct elf_x86_lazy_plt_layout
 263 {
 264   /* The first entry in an absolute lazy procedure linkage table looks
 265      like this.  */
 266   const bfd_byte *plt0_entry;
 267   unsigned int plt0_entry_size;          /* Size of PLT0 entry.  */
 268
 269   /* Later entries in an absolute lazy procedure linkage table look
 270      like this.  */
 271   const bfd_byte *plt_entry;
 272   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 273
 274   /* Offsets into plt0_entry that are to be replaced with GOT[1] and
 275      GOT[2].  */
 276   unsigned int plt0_got1_offset;
 277   unsigned int plt0_got2_offset;
 278
 279   /* Offset of the end of the PC-relative instruction containing
 280      plt0_got2_offset.  This is for x86-64 only.  */
 281   unsigned int plt0_got2_insn_end;
 282
 283   /* Offsets into plt_entry that are to be replaced with...  */
 284   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 285   unsigned int plt_reloc_offset;  /* ... offset into relocation table. */
 286   unsigned int plt_plt_offset;    /* ... offset to start of .plt. */
 287
 288   /* Length of the PC-relative instruction containing plt_got_offset.
 289      This is used for x86-64 only.  */
 290   unsigned int plt_got_insn_size;
 291
 292   /* Offset of the end of the PC-relative jump to plt0_entry.  This is
 293      used for x86-64 only.  */
 294   unsigned int plt_plt_insn_end;
 295
 296   /* Offset into plt_entry where the initial value of the GOT entry
 297      points.  */
 298   unsigned int plt_lazy_offset;
 299
 300   /* The first entry in a PIC lazy procedure linkage table looks like
 301      this.  */
 302   const bfd_byte *pic_plt0_entry;
 303
 304   /* Subsequent entries in a PIC lazy procedure linkage table look
 305      like this.  */
 306   const bfd_byte *pic_plt_entry;
 307
 308   /* .eh_frame covering the lazy .plt section.  */
 309   const bfd_byte *eh_frame_plt;
 310   unsigned int eh_frame_plt_size;
 311 };
 312
 313 struct elf_x86_non_lazy_plt_layout
 314 {
 315   /* Entries in an absolute non-lazy procedure linkage table look like
 316      this.  */
 317   const bfd_byte *plt_entry;
 318   /* Entries in a PIC non-lazy procedure linkage table look like this.  */
 319   const bfd_byte *pic_plt_entry;
 320
 321   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 322
 323   /* Offsets into plt_entry that are to be replaced with...  */
 324   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 325
 326   /* Length of the PC-relative instruction containing plt_got_offset.
 327      This is used for x86-64 only.  */
 328   unsigned int plt_got_insn_size;
 329
 330   /* .eh_frame covering the non-lazy .plt section.  */
 331   const bfd_byte *eh_frame_plt;
 332   unsigned int eh_frame_plt_size;
 333 };
 334
 335 struct elf_x86_plt_layout
 336 {
 337   /* The first entry in a lazy procedure linkage table looks like this.
 338      This is only used for i386 where absolute PLT0 and PIC PLT0 are
 339      different.  */
 340   const bfd_byte *plt0_entry;
 341   /* Entries in a procedure linkage table look like this.  */
 342   const bfd_byte *plt_entry;
 343   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 344
 345   /* 1 has PLT0.  */
 346   unsigned int has_plt0;
 347
 348   /* Offsets into plt_entry that are to be replaced with...  */
 349   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 350
 351   /* Length of the PC-relative instruction containing plt_got_offset.
 352      This is only used for x86-64.  */
 353   unsigned int plt_got_insn_size;
 354
 355   /* .eh_frame covering the .plt section.  */
 356   const bfd_byte *eh_frame_plt;
 357   unsigned int eh_frame_plt_size;
 358 };
 359
 360 /* Values in tls_type of x86 ELF linker hash entry.  */
 361 #define GOT_UNKNOWN     0
 362 #define GOT_NORMAL      1
 363 #define GOT_TLS_GD      2
 364 #define GOT_TLS_IE      4
 365 #define GOT_TLS_IE_POS  5
 366 #define GOT_TLS_IE_NEG  6
 367 #define GOT_TLS_IE_BOTH 7
 368 #define GOT_TLS_GDESC   8
 369 #define GOT_TLS_GD_BOTH_P(type) \
 370   ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
 371 #define GOT_TLS_GD_P(type) \
 372   ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
 373 #define GOT_TLS_GDESC_P(type) \
 374   ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
 375 #define GOT_TLS_GD_ANY_P(type) \
 376   (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
 377
 378 #define elf_x86_hash_entry(ent) \
 379   ((struct elf_x86_link_hash_entry *)(ent))
 380
 381 /* x86 ELF linker hash table.  */
 382
 383 struct elf_x86_link_hash_table
 384 {
 385   struct elf_link_hash_table elf;
 386
 387   /* Short-cuts to get to dynamic linker sections.  */
 388   asection *interp;
 389   asection *plt_eh_frame;
 390   asection *plt_second;
 391   asection *plt_second_eh_frame;
 392   asection *plt_got;
 393   asection *plt_got_eh_frame;
 394
 395   /* Parameters describing PLT generation, lazy or non-lazy.  */
 396   struct elf_x86_plt_layout plt;
 397
 398   /* Parameters describing lazy PLT generation.  */
 399   const struct elf_x86_lazy_plt_layout *lazy_plt;
 400
 401   /* Parameters describing non-lazy PLT generation.  */
 402   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 403
 404   union
 405   {
 406     bfd_signed_vma refcount;
 407     bfd_vma offset;
 408   } tls_ld_or_ldm_got;
 409
 410   /* The amount of space used by the jump slots in the GOT.  */
 411   bfd_vma sgotplt_jump_table_size;
 412
 413   /* Small local sym cache.  */
 414   struct sym_cache sym_cache;
 415
 416   /* _TLS_MODULE_BASE_ symbol.  */
 417   struct bfd_link_hash_entry *tls_module_base;
 418
 419   /* Used by local STT_GNU_IFUNC symbols.  */
 420   htab_t loc_hash_table;
 421   void * loc_hash_memory;
 422
 423   /* The offset into sgot of the GOT entry used by the PLT entry
 424      above.  */
 425   bfd_vma tlsdesc_got;
 426
 427   /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt.  */
 428   bfd_vma next_jump_slot_index;
 429   /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt.  */
 430   bfd_vma next_irelative_index;
 431
 432   /* TRUE if there are dynamic relocs against IFUNC symbols that apply
 433      to read-only sections.  */
 434   bfd_boolean readonly_dynrelocs_against_ifunc;
 435
 436   /* TRUE if this is a VxWorks x86 target.  This is only used for
 437      i386.  */
 438   bfd_boolean is_vxworks;
 439
 440   /* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
 441      This is used for i386 only.  */
 442   asection *srelplt2;
 443
 444   /* The index of the next unused R_386_TLS_DESC slot in .rel.plt.  This
 445      is only used for i386.  */
 446   bfd_vma next_tls_desc_index;
 447
 448   /* The offset into splt of the PLT entry for the TLS descriptor
 449      resolver.  Special values are 0, if not necessary (or not found
 450      to be necessary yet), and -1 if needed but not determined
 451      yet.  This is only used for x86-64.  */
 452   bfd_vma tlsdesc_plt;
 453
 454   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 455   bfd_vma (*r_sym) (bfd_vma);
 456   bfd_boolean (*is_reloc_section) (const char *);
 457   enum elf_target_id target_id;
 458   unsigned int sizeof_reloc;
 459   unsigned int dt_reloc;
 460   unsigned int dt_reloc_sz;
 461   unsigned int dt_reloc_ent;
 462   unsigned int got_entry_size;
 463   unsigned int pointer_r_type;
 464   int dynamic_interpreter_size;
 465   const char *dynamic_interpreter;
 466   const char *tls_get_addr;
 467 };
 468
 469 struct elf_x86_init_table
 470 {
 471   /* The lazy PLT layout.  */
 472   const struct elf_x86_lazy_plt_layout *lazy_plt;
 473
 474   /* The non-lazy PLT layout.  */
 475   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 476
 477   /* The lazy PLT layout for IBT.  */
 478   const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
 479
 480   /* The non-lazy PLT layout for IBT.  */
 481   const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
 482
 483   /* TRUE if this is a normal x86 target.  */
 484   bfd_boolean normal_target;
 485
 486   /* TRUE if this is a VxWorks x86 target.  */
 487   bfd_boolean is_vxworks;
 488
 489   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 490   bfd_vma (*r_sym) (bfd_vma);
 491 };
 492
 493 struct elf_x86_obj_tdata
 494 {
 495   struct elf_obj_tdata root;
 496
 497   /* tls_type for each local got entry.  */
 498   char *local_got_tls_type;
 499
 500   /* GOTPLT entries for TLS descriptors.  */
 501   bfd_vma *local_tlsdesc_gotent;
 502 };
 503
 504 enum elf_x86_plt_type
 505 {
 506   plt_non_lazy = 0,
 507   plt_lazy = 1 << 0,
 508   plt_pic = 1 << 1,
 509   plt_second = 1 << 2,
 510   plt_unknown = -1
 511 };
 512
 513 struct elf_x86_plt
 514 {
 515   const char *name;
 516   asection *sec;
 517   bfd_byte *contents;
 518   enum elf_x86_plt_type type;
 519   unsigned int plt_got_offset;
 520   unsigned int plt_entry_size;
 521   unsigned int plt_got_insn_size;       /* Only used for x86-64.  */
 522   long count;
 523 };
 524
 525 #define elf_x86_tdata(abfd) \
 526   ((struct elf_x86_obj_tdata *) (abfd)->tdata.any)
 527
 528 #define elf_x86_local_got_tls_type(abfd) \
 529   (elf_x86_tdata (abfd)->local_got_tls_type)
 530
 531 #define elf_x86_local_tlsdesc_gotent(abfd) \
 532   (elf_x86_tdata (abfd)->local_tlsdesc_gotent)
 533
 534 #define elf_x86_compute_jump_table_size(htab) \
 535   ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)
 536
 537 #define is_x86_elf(bfd, htab)                           \
 538   (bfd_get_flavour (bfd) == bfd_target_elf_flavour      \
 539    && elf_tdata (bfd) != NULL                           \
 540    && elf_object_id (bfd) == (htab)->target_id)
 541
 542 extern bfd_boolean _bfd_x86_elf_mkobject
 543   (bfd *);
 544
 545 extern void _bfd_x86_elf_set_tls_module_base
 546   (struct bfd_link_info *);
 547
 548 extern bfd_vma _bfd_x86_elf_dtpoff_base
 549   (struct bfd_link_info *);
 550
 551 extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
 552   (struct elf_link_hash_entry *, void *);
 553
 554 extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
 555   (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *,
 556    bfd_boolean);
 557
 558 extern hashval_t _bfd_x86_elf_local_htab_hash
 559   (const void *);
 560
 561 extern int _bfd_x86_elf_local_htab_eq
 562   (const void *, const void *);
 563
 564 extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
 565   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 566
 567 extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
 568   (bfd *);
 569
 570 extern int _bfd_x86_elf_compare_relocs
 571   (const void *, const void *);
 572
 573 extern bfd_boolean _bfd_x86_elf_link_check_relocs
 574   (bfd *, struct bfd_link_info *);
 575
 576 extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
 577   (bfd *, struct bfd_link_info *);
 578
 579 extern bfd_boolean _bfd_x86_elf_always_size_sections
 580   (bfd *, struct bfd_link_info *);
 581
 582 extern void _bfd_x86_elf_merge_symbol_attribute
 583   (struct elf_link_hash_entry *, const Elf_Internal_Sym *,
 584    bfd_boolean, bfd_boolean);
 585
 586 extern void _bfd_x86_elf_copy_indirect_symbol
 587   (struct bfd_link_info *, struct elf_link_hash_entry *,
 588    struct elf_link_hash_entry *);
 589
 590 extern bfd_boolean _bfd_x86_elf_fixup_symbol
 591   (struct bfd_link_info *, struct elf_link_hash_entry *);
 592
 593 extern bfd_boolean _bfd_x86_elf_hash_symbol
 594   (struct elf_link_hash_entry *);
 595
 596 extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
 597   (struct bfd_link_info *, struct elf_link_hash_entry *);
 598
 599 extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
 600   (struct bfd_link_info *, struct elf_link_hash_entry *);
 601
 602 extern asection * _bfd_x86_elf_gc_mark_hook
 603   (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
 604    struct elf_link_hash_entry *, Elf_Internal_Sym *);
 605
 606 extern long _bfd_x86_elf_get_synthetic_symtab
 607   (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **,
 608    asymbol **);
 609
 610 extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
 611   (bfd *, unsigned int, bfd_byte *, unsigned int);
 612
 613 extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
 614   (struct bfd_link_info *, bfd *, elf_property *, elf_property *);
 615
 616 extern bfd * _bfd_x86_elf_link_setup_gnu_properties
 617   (struct bfd_link_info *, struct elf_x86_init_table *);
 618
 619 #define bfd_elf64_mkobject \
 620   _bfd_x86_elf_mkobject
 621 #define bfd_elf32_mkobject \
 622   _bfd_x86_elf_mkobject
 623 #define bfd_elf64_bfd_link_hash_table_create \
 624   _bfd_x86_elf_link_hash_table_create
 625 #define bfd_elf32_bfd_link_hash_table_create \
 626   _bfd_x86_elf_link_hash_table_create
 627 #define bfd_elf64_bfd_link_check_relocs \
 628   _bfd_x86_elf_link_check_relocs
 629 #define bfd_elf32_bfd_link_check_relocs \
 630   _bfd_x86_elf_link_check_relocs
 631
 632 #define elf_backend_size_dynamic_sections \
 633   _bfd_x86_elf_size_dynamic_sections
 634 #define elf_backend_always_size_sections \
 635   _bfd_x86_elf_always_size_sections
 636 #define elf_backend_merge_symbol_attribute \
 637   _bfd_x86_elf_merge_symbol_attribute
 638 #define elf_backend_copy_indirect_symbol \
 639   _bfd_x86_elf_copy_indirect_symbol
 640 #define elf_backend_fixup_symbol \
 641   _bfd_x86_elf_fixup_symbol
 642 #define elf_backend_hash_symbol \
 643   _bfd_x86_elf_hash_symbol
 644 #define elf_backend_adjust_dynamic_symbol \
 645   _bfd_x86_elf_adjust_dynamic_symbol
 646 #define elf_backend_gc_mark_hook \
 647   _bfd_x86_elf_gc_mark_hook
 648 #define elf_backend_omit_section_dynsym \
 649   ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
 650 #define elf_backend_parse_gnu_properties \
 651   _bfd_x86_elf_parse_gnu_properties
 652 #define elf_backend_merge_gnu_properties \
 653   _bfd_x86_elf_merge_gnu_properties