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 /* TRUE if an undefined weak symbol should be resolved to 0.  Local
  53    undefined weak symbol is always resolved to 0.  Reference to an
  54    undefined weak symbol is resolved to 0 in executable if undefined
  55    weak symbol should be resolved to 0 (zero_undefweak > 0).  */
  56 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
  57   ((EH)->elf.root.type == bfd_link_hash_undefweak                \
  58    && (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf)            \
  59        || (bfd_link_executable (INFO)                            \
  60            && (EH)->zero_undefweak > 0)))
  61
  62 /* Should copy relocation be generated for a symbol.  Don't generate
  63    copy relocation against a protected symbol defined in a shared
  64    object with GNU_PROPERTY_NO_COPY_ON_PROTECTED.  */
  65 #define SYMBOL_NO_COPYRELOC(INFO, EH) \
  66   ((EH)->def_protected \
  67    && ((EH)->elf.root.type == bfd_link_hash_defined \
  68        || (EH)->elf.root.type == bfd_link_hash_defweak) \
  69    && elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \
  70    && ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \
  71    && ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0)
  72
  73 /* TRUE if dynamic relocation is needed.  If we are creating a shared
  74    library, and this is a reloc against a global symbol, or a non PC
  75    relative reloc against a local symbol, then we need to copy the reloc
  76    into the shared library.  However, if we are linking with -Bsymbolic,
  77    we do not need to copy a reloc against a global symbol which is
  78    defined in an object we are including in the link (i.e., DEF_REGULAR
  79    is set).  At this point we have not seen all the input files, so it
  80    is possible that DEF_REGULAR is not set now but will be set later (it
  81    is never cleared).  In case of a weak definition, DEF_REGULAR may be
  82    cleared later by a strong definition in a shared library.  We account
  83    for that possibility below by storing information in the relocs_copied
  84    field of the hash table entry.  A similar situation occurs when
  85    creating shared libraries and symbol visibility changes render the
  86    symbol local.
  87
  88    If on the other hand, we are creating an executable, we may need to
  89    keep relocations for symbols satisfied by a dynamic library if we
  90    manage to avoid copy relocs for the symbol.
  91
  92    We also need to generate dynamic pointer relocation against
  93    STT_GNU_IFUNC symbol in the non-code section.  */
  94 #define NEED_DYNAMIC_RELOCATION_P(INFO, H, SEC, R_TYPE, POINTER_TYPE) \
  95   ((bfd_link_pic (INFO) \
  96     && (! X86_PCREL_TYPE_P (R_TYPE) \
  97         || ((H) != NULL \
  98             && (! (bfd_link_pie (INFO) \
  99                    || SYMBOLIC_BIND ((INFO), (H))) \
 100                 || (H)->root.type == bfd_link_hash_defweak \
 101                 || !(H)->def_regular)))) \
 102                 || ((H) != NULL \
 103                     && (H)->type == STT_GNU_IFUNC \
 104                     && (R_TYPE) == POINTER_TYPE \
 105                     && ((SEC)->flags & SEC_CODE) == 0) \
 106                     || (ELIMINATE_COPY_RELOCS \
 107                         && !bfd_link_pic (INFO) \
 108                         && (H) != NULL \
 109                         && ((H)->root.type == bfd_link_hash_defweak \
 110                             || !(H)->def_regular)))
 111
 112 /* TRUE if dynamic relocation should be generated.  Don't copy a
 113    pc-relative relocation into the output file if the symbol needs
 114    copy reloc or the symbol is undefined when building executable.
 115    Copy dynamic function pointer relocations.  Don't generate dynamic
 116    relocations against resolved undefined weak symbols in PIE, except
 117    when PC32_RELOC is TRUE.  Undefined weak symbol is bound locally
 118    when PIC is false.  */
 119 #define GENERATE_DYNAMIC_RELOCATION_P(INFO, EH, R_TYPE, \
 120                                       NEED_COPY_RELOC_IN_PIE, \
 121                                       RESOLVED_TO_ZERO, PC32_RELOC) \
 122   ((bfd_link_pic (INFO) \
 123     && !(NEED_COPY_RELOC_IN_PIE) \
 124     && ((EH) == NULL \
 125         || ((ELF_ST_VISIBILITY ((EH)->elf.other) == STV_DEFAULT \
 126              && (!(RESOLVED_TO_ZERO) || PC32_RELOC)) \
 127             || (EH)->elf.root.type != bfd_link_hash_undefweak)) \
 128     && ((!X86_PCREL_TYPE_P (R_TYPE) \
 129          && !X86_SIZE_TYPE_P (R_TYPE)) \
 130          || ! SYMBOL_CALLS_LOCAL ((INFO), &(EH)->elf))) \
 131    || (ELIMINATE_COPY_RELOCS \
 132        && !bfd_link_pic (INFO) \
 133        && (EH) != NULL \
 134        && (EH)->elf.dynindx != -1 \
 135        && (!(EH)->elf.non_got_ref \
 136            || (EH)->func_pointer_refcount > 0 \
 137            || ((EH)->elf.root.type == bfd_link_hash_undefweak \
 138                && !(RESOLVED_TO_ZERO))) \
 139                && (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \
 140                    || (EH)->elf.root.type == bfd_link_hash_undefined)))
 141
 142 /* TRUE if this input relocation should be copied to output.  H->dynindx
 143    may be -1 if this symbol was marked to become local.  */
 144 #define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \
 145   ((H) != NULL \
 146    && (H)->dynindx != -1 \
 147    && (X86_PCREL_TYPE_P (R_TYPE) \
 148        || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \
 149        || !(H)->def_regular))
 150
 151 /* TRUE if this is actually a static link, or it is a -Bsymbolic link
 152    and the symbol is defined locally, or the symbol was forced to be
 153    local because of a version file.  */
 154 #define RESOLVED_LOCALLY_P(INFO, H, HTAB) \
 155   (!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \
 156                                      bfd_link_pic (INFO), (H)) \
 157    || (bfd_link_pic (INFO) \
 158        && SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \
 159        || (ELF_ST_VISIBILITY ((H)->other) \
 160            && (H)->root.type == bfd_link_hash_undefweak))
 161
 162 /* TRUE if relative relocation should be generated.  GOT reference to
 163    global symbol in PIC will lead to dynamic symbol.  It becomes a
 164    problem when "time" or "times" is defined as a variable in an
 165    executable, clashing with functions of the same name in libc.  If a
 166    symbol isn't undefined weak symbol, don't make it dynamic in PIC and
 167    generate relative relocation.  */
 168 #define GENERATE_RELATIVE_RELOC_P(INFO, H) \
 169   ((H)->dynindx == -1 \
 170    && !(H)->forced_local \
 171    && (H)->root.type != bfd_link_hash_undefweak \
 172    && bfd_link_pic (INFO))
 173
 174 /* TRUE if this is a pointer reference to a local IFUNC.  */
 175 #define POINTER_LOCAL_IFUNC_P(INFO, H) \
 176   ((H)->dynindx == -1 \
 177    || (H)->forced_local \
 178    || bfd_link_executable (INFO))
 179
 180 /* TRUE if this is a PLT reference to a local IFUNC.  */
 181 #define PLT_LOCAL_IFUNC_P(INFO, H) \
 182   ((H)->dynindx == -1 \
 183    || ((bfd_link_executable (INFO) \
 184         || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \
 185         && (H)->def_regular \
 186         && (H)->type == STT_GNU_IFUNC))
 187
 188 /* TRUE if TLS IE->LE transition is OK.  */
 189 #define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \
 190   (bfd_link_executable (INFO) \
 191    && (H) != NULL \
 192    && (H)->dynindx == -1 \
 193    && (TLS_TYPE & GOT_TLS_IE))
 194
 195 /* Verify that the symbol has an entry in the procedure linkage table.  */
 196 #define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \
 197   do \
 198     { \
 199       if (((H)->dynindx == -1 \
 200            && !LOCAL_UNDEFWEAK \
 201            && !(((H)->forced_local || bfd_link_executable (INFO)) \
 202                 && (H)->def_regular \
 203                 && (H)->type == STT_GNU_IFUNC)) \
 204           || (PLT) == NULL \
 205           || (GOTPLT) == NULL \
 206           || (RELPLT) == NULL) \
 207         abort (); \
 208     } \
 209   while (0);
 210
 211 /* Verify that the symbol supports copy relocation.  */
 212 #define VERIFY_COPY_RELOC(H, HTAB) \
 213   do \
 214     { \
 215       if ((H)->dynindx == -1 \
 216           || ((H)->root.type != bfd_link_hash_defined \
 217               && (H)->root.type != bfd_link_hash_defweak) \
 218           || (HTAB)->elf.srelbss == NULL \
 219           || (HTAB)->elf.sreldynrelro == NULL) \
 220         abort (); \
 221     } \
 222   while (0);
 223
 224 /* x86 ELF linker hash entry.  */
 225
 226 struct elf_x86_link_hash_entry
 227 {
 228   struct elf_link_hash_entry elf;
 229
 230   /* Track dynamic relocs copied for this symbol.  */
 231   struct elf_dyn_relocs *dyn_relocs;
 232
 233   unsigned char tls_type;
 234
 235   /* Bit 0: Symbol has no GOT nor PLT relocations.
 236      Bit 1: Symbol has non-GOT/non-PLT relocations in text sections.
 237      zero_undefweak is initialized to 1 and undefined weak symbol
 238      should be resolved to 0 if zero_undefweak > 0.  */
 239   unsigned int zero_undefweak : 2;
 240
 241   /* Don't call finish_dynamic_symbol on this symbol.  */
 242   unsigned int no_finish_dynamic_symbol : 1;
 243
 244   /* TRUE if symbol is __tls_get_addr.  */
 245   unsigned int tls_get_addr : 1;
 246
 247   /* TRUE if symbol is defined as a protected symbol.  */
 248   unsigned int def_protected : 1;
 249
 250   /* 0: Symbol references are unknown.
 251      1: Symbol references aren't local.
 252      2: Symbol references are local.
 253    */
 254   unsigned int local_ref : 2;
 255
 256   /* TRUE if symbol is defined by linker.  */
 257   unsigned int linker_def : 1;
 258
 259   /* TRUE if symbol is referenced by R_386_GOTOFF relocation.  This is
 260      only used by i386.  */
 261   unsigned int gotoff_ref : 1;
 262
 263   /* TRUE if a weak symbol with a real definition needs a copy reloc.
 264      When there is a weak symbol with a real definition, the processor
 265      independent code will have arranged for us to see the real
 266      definition first.  We need to copy the needs_copy bit from the
 267      real definition and check it when allowing copy reloc in PIE.  This
 268      is only used by x86-64.  */
 269   unsigned int needs_copy : 1;
 270
 271   /* Reference count of C/C++ function pointer relocations in read-write
 272      section which can be resolved at run-time.  */
 273   bfd_signed_vma func_pointer_refcount;
 274
 275   /* Information about the GOT PLT entry. Filled when there are both
 276      GOT and PLT relocations against the same function.  */
 277   union gotplt_union plt_got;
 278
 279   /* Information about the second PLT entry.   */
 280   union gotplt_union plt_second;
 281
 282   /* Offset of the GOTPLT entry reserved for the TLS descriptor,
 283      starting at the end of the jump table.  */
 284   bfd_vma tlsdesc_got;
 285 };
 286
 287 struct elf_x86_lazy_plt_layout
 288 {
 289   /* The first entry in an absolute lazy procedure linkage table looks
 290      like this.  */
 291   const bfd_byte *plt0_entry;
 292   unsigned int plt0_entry_size;          /* Size of PLT0 entry.  */
 293
 294   /* Later entries in an absolute lazy procedure linkage table look
 295      like this.  */
 296   const bfd_byte *plt_entry;
 297   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 298
 299   /* Offsets into plt0_entry that are to be replaced with GOT[1] and
 300      GOT[2].  */
 301   unsigned int plt0_got1_offset;
 302   unsigned int plt0_got2_offset;
 303
 304   /* Offset of the end of the PC-relative instruction containing
 305      plt0_got2_offset.  This is for x86-64 only.  */
 306   unsigned int plt0_got2_insn_end;
 307
 308   /* Offsets into plt_entry that are to be replaced with...  */
 309   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 310   unsigned int plt_reloc_offset;  /* ... offset into relocation table. */
 311   unsigned int plt_plt_offset;    /* ... offset to start of .plt. */
 312
 313   /* Length of the PC-relative instruction containing plt_got_offset.
 314      This is used for x86-64 only.  */
 315   unsigned int plt_got_insn_size;
 316
 317   /* Offset of the end of the PC-relative jump to plt0_entry.  This is
 318      used for x86-64 only.  */
 319   unsigned int plt_plt_insn_end;
 320
 321   /* Offset into plt_entry where the initial value of the GOT entry
 322      points.  */
 323   unsigned int plt_lazy_offset;
 324
 325   /* The first entry in a PIC lazy procedure linkage table looks like
 326      this.  */
 327   const bfd_byte *pic_plt0_entry;
 328
 329   /* Subsequent entries in a PIC lazy procedure linkage table look
 330      like this.  */
 331   const bfd_byte *pic_plt_entry;
 332
 333   /* .eh_frame covering the lazy .plt section.  */
 334   const bfd_byte *eh_frame_plt;
 335   unsigned int eh_frame_plt_size;
 336 };
 337
 338 struct elf_x86_non_lazy_plt_layout
 339 {
 340   /* Entries in an absolute non-lazy procedure linkage table look like
 341      this.  */
 342   const bfd_byte *plt_entry;
 343   /* Entries in a PIC non-lazy procedure linkage table look like this.  */
 344   const bfd_byte *pic_plt_entry;
 345
 346   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 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 used for x86-64 only.  */
 353   unsigned int plt_got_insn_size;
 354
 355   /* .eh_frame covering the non-lazy .plt section.  */
 356   const bfd_byte *eh_frame_plt;
 357   unsigned int eh_frame_plt_size;
 358 };
 359
 360 struct elf_x86_plt_layout
 361 {
 362   /* The first entry in a lazy procedure linkage table looks like this.
 363      This is only used for i386 where absolute PLT0 and PIC PLT0 are
 364      different.  */
 365   const bfd_byte *plt0_entry;
 366   /* Entries in a procedure linkage table look like this.  */
 367   const bfd_byte *plt_entry;
 368   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 369
 370   /* 1 has PLT0.  */
 371   unsigned int has_plt0;
 372
 373   /* Offsets into plt_entry that are to be replaced with...  */
 374   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 375
 376   /* Length of the PC-relative instruction containing plt_got_offset.
 377      This is only used for x86-64.  */
 378   unsigned int plt_got_insn_size;
 379
 380   /* .eh_frame covering the .plt section.  */
 381   const bfd_byte *eh_frame_plt;
 382   unsigned int eh_frame_plt_size;
 383 };
 384
 385 /* Values in tls_type of x86 ELF linker hash entry.  */
 386 #define GOT_UNKNOWN     0
 387 #define GOT_NORMAL      1
 388 #define GOT_TLS_GD      2
 389 #define GOT_TLS_IE      4
 390 #define GOT_TLS_IE_POS  5
 391 #define GOT_TLS_IE_NEG  6
 392 #define GOT_TLS_IE_BOTH 7
 393 #define GOT_TLS_GDESC   8
 394 #define GOT_TLS_GD_BOTH_P(type) \
 395   ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
 396 #define GOT_TLS_GD_P(type) \
 397   ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
 398 #define GOT_TLS_GDESC_P(type) \
 399   ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
 400 #define GOT_TLS_GD_ANY_P(type) \
 401   (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
 402
 403 #define elf_x86_hash_entry(ent) \
 404   ((struct elf_x86_link_hash_entry *)(ent))
 405
 406 enum elf_x86_target_os
 407 {
 408   is_normal,
 409   is_vxworks,
 410   is_nacl
 411 };
 412
 413 /* x86 ELF linker hash table.  */
 414
 415 struct elf_x86_link_hash_table
 416 {
 417   struct elf_link_hash_table elf;
 418
 419   /* Short-cuts to get to dynamic linker sections.  */
 420   asection *interp;
 421   asection *plt_eh_frame;
 422   asection *plt_second;
 423   asection *plt_second_eh_frame;
 424   asection *plt_got;
 425   asection *plt_got_eh_frame;
 426
 427   /* Parameters describing PLT generation, lazy or non-lazy.  */
 428   struct elf_x86_plt_layout plt;
 429
 430   /* Parameters describing lazy PLT generation.  */
 431   const struct elf_x86_lazy_plt_layout *lazy_plt;
 432
 433   /* Parameters describing non-lazy PLT generation.  */
 434   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 435
 436   union
 437   {
 438     bfd_signed_vma refcount;
 439     bfd_vma offset;
 440   } tls_ld_or_ldm_got;
 441
 442   /* The amount of space used by the jump slots in the GOT.  */
 443   bfd_vma sgotplt_jump_table_size;
 444
 445   /* Small local sym cache.  */
 446   struct sym_cache sym_cache;
 447
 448   /* _TLS_MODULE_BASE_ symbol.  */
 449   struct bfd_link_hash_entry *tls_module_base;
 450
 451   /* Used by local STT_GNU_IFUNC symbols.  */
 452   htab_t loc_hash_table;
 453   void * loc_hash_memory;
 454
 455   /* The offset into sgot of the GOT entry used by the PLT entry
 456      above.  */
 457   bfd_vma tlsdesc_got;
 458
 459   /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt.  */
 460   bfd_vma next_jump_slot_index;
 461   /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt.  */
 462   bfd_vma next_irelative_index;
 463
 464   /* TRUE if there are dynamic relocs against IFUNC symbols that apply
 465      to read-only sections.  */
 466   bfd_boolean readonly_dynrelocs_against_ifunc;
 467
 468   /* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
 469      This is used for i386 only.  */
 470   asection *srelplt2;
 471
 472   /* The index of the next unused R_386_TLS_DESC slot in .rel.plt.  This
 473      is only used for i386.  */
 474   bfd_vma next_tls_desc_index;
 475
 476   /* The offset into splt of the PLT entry for the TLS descriptor
 477      resolver.  Special values are 0, if not necessary (or not found
 478      to be necessary yet), and -1 if needed but not determined
 479      yet.  This is only used for x86-64.  */
 480   bfd_vma tlsdesc_plt;
 481
 482    /* Value used to fill the unused bytes of the first PLT entry.  This
 483       is only used for i386.  */
 484   bfd_byte plt0_pad_byte;
 485
 486   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 487   bfd_vma (*r_sym) (bfd_vma);
 488   bfd_boolean (*is_reloc_section) (const char *);
 489   enum elf_target_id target_id;
 490   enum elf_x86_target_os target_os;
 491   unsigned int sizeof_reloc;
 492   unsigned int dt_reloc;
 493   unsigned int dt_reloc_sz;
 494   unsigned int dt_reloc_ent;
 495   unsigned int got_entry_size;
 496   unsigned int pointer_r_type;
 497   int dynamic_interpreter_size;
 498   const char *dynamic_interpreter;
 499   const char *tls_get_addr;
 500 };
 501
 502 /* Architecture-specific backend data for x86.  */
 503
 504 struct elf_x86_backend_data
 505 {
 506   /* Target system.  */
 507   enum elf_x86_target_os target_os;
 508 };
 509
 510 #define get_elf_x86_backend_data(abfd) \
 511   ((const struct elf_x86_backend_data *) \
 512    get_elf_backend_data (abfd)->arch_data)
 513
 514 struct elf_x86_init_table
 515 {
 516   /* The lazy PLT layout.  */
 517   const struct elf_x86_lazy_plt_layout *lazy_plt;
 518
 519   /* The non-lazy PLT layout.  */
 520   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 521
 522   /* The lazy PLT layout for IBT.  */
 523   const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
 524
 525   /* The non-lazy PLT layout for IBT.  */
 526   const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
 527
 528   bfd_byte plt0_pad_byte;
 529
 530   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 531   bfd_vma (*r_sym) (bfd_vma);
 532 };
 533
 534 struct elf_x86_obj_tdata
 535 {
 536   struct elf_obj_tdata root;
 537
 538   /* tls_type for each local got entry.  */
 539   char *local_got_tls_type;
 540
 541   /* GOTPLT entries for TLS descriptors.  */
 542   bfd_vma *local_tlsdesc_gotent;
 543 };
 544
 545 enum elf_x86_plt_type
 546 {
 547   plt_non_lazy = 0,
 548   plt_lazy = 1 << 0,
 549   plt_pic = 1 << 1,
 550   plt_second = 1 << 2,
 551   plt_unknown = -1
 552 };
 553
 554 struct elf_x86_plt
 555 {
 556   const char *name;
 557   asection *sec;
 558   bfd_byte *contents;
 559   enum elf_x86_plt_type type;
 560   unsigned int plt_got_offset;
 561   unsigned int plt_entry_size;
 562   unsigned int plt_got_insn_size;       /* Only used for x86-64.  */
 563   long count;
 564 };
 565
 566 #define elf_x86_tdata(abfd) \
 567   ((struct elf_x86_obj_tdata *) (abfd)->tdata.any)
 568
 569 #define elf_x86_local_got_tls_type(abfd) \
 570   (elf_x86_tdata (abfd)->local_got_tls_type)
 571
 572 #define elf_x86_local_tlsdesc_gotent(abfd) \
 573   (elf_x86_tdata (abfd)->local_tlsdesc_gotent)
 574
 575 #define elf_x86_compute_jump_table_size(htab) \
 576   ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)
 577
 578 #define is_x86_elf(bfd, htab)                           \
 579   (bfd_get_flavour (bfd) == bfd_target_elf_flavour      \
 580    && elf_tdata (bfd) != NULL                           \
 581    && elf_object_id (bfd) == (htab)->target_id)
 582
 583 extern bfd_boolean _bfd_x86_elf_mkobject
 584   (bfd *);
 585
 586 extern void _bfd_x86_elf_set_tls_module_base
 587   (struct bfd_link_info *);
 588
 589 extern bfd_vma _bfd_x86_elf_dtpoff_base
 590   (struct bfd_link_info *);
 591
 592 extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
 593   (struct elf_link_hash_entry *, void *);
 594
 595 extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
 596   (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *,
 597    bfd_boolean);
 598
 599 extern hashval_t _bfd_x86_elf_local_htab_hash
 600   (const void *);
 601
 602 extern int _bfd_x86_elf_local_htab_eq
 603   (const void *, const void *);
 604
 605 extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
 606   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 607
 608 extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
 609   (bfd *);
 610
 611 extern int _bfd_x86_elf_compare_relocs
 612   (const void *, const void *);
 613
 614 extern bfd_boolean _bfd_x86_elf_link_check_relocs
 615   (bfd *, struct bfd_link_info *);
 616
 617 extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
 618   (bfd *, struct bfd_link_info *);
 619
 620 extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections
 621   (bfd *, struct bfd_link_info *);
 622
 623 extern bfd_boolean _bfd_x86_elf_always_size_sections
 624   (bfd *, struct bfd_link_info *);
 625
 626 extern void _bfd_x86_elf_merge_symbol_attribute
 627   (struct elf_link_hash_entry *, const Elf_Internal_Sym *,
 628    bfd_boolean, bfd_boolean);
 629
 630 extern void _bfd_x86_elf_copy_indirect_symbol
 631   (struct bfd_link_info *, struct elf_link_hash_entry *,
 632    struct elf_link_hash_entry *);
 633
 634 extern bfd_boolean _bfd_x86_elf_fixup_symbol
 635   (struct bfd_link_info *, struct elf_link_hash_entry *);
 636
 637 extern bfd_boolean _bfd_x86_elf_hash_symbol
 638   (struct elf_link_hash_entry *);
 639
 640 extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
 641   (struct bfd_link_info *, struct elf_link_hash_entry *);
 642
 643 extern void _bfd_x86_elf_hide_symbol
 644   (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
 645
 646 extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
 647   (struct bfd_link_info *, struct elf_link_hash_entry *);
 648
 649 extern asection * _bfd_x86_elf_gc_mark_hook
 650   (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
 651    struct elf_link_hash_entry *, Elf_Internal_Sym *);
 652
 653 extern long _bfd_x86_elf_get_synthetic_symtab
 654   (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **,
 655    asymbol **);
 656
 657 extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
 658   (bfd *, unsigned int, bfd_byte *, unsigned int);
 659
 660 extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
 661   (struct bfd_link_info *, bfd *, elf_property *, elf_property *);
 662
 663 extern bfd * _bfd_x86_elf_link_setup_gnu_properties
 664   (struct bfd_link_info *, struct elf_x86_init_table *);
 665
 666 #define bfd_elf64_mkobject \
 667   _bfd_x86_elf_mkobject
 668 #define bfd_elf32_mkobject \
 669   _bfd_x86_elf_mkobject
 670 #define bfd_elf64_bfd_link_hash_table_create \
 671   _bfd_x86_elf_link_hash_table_create
 672 #define bfd_elf32_bfd_link_hash_table_create \
 673   _bfd_x86_elf_link_hash_table_create
 674 #define bfd_elf64_bfd_link_check_relocs \
 675   _bfd_x86_elf_link_check_relocs
 676 #define bfd_elf32_bfd_link_check_relocs \
 677   _bfd_x86_elf_link_check_relocs
 678
 679 #define elf_backend_size_dynamic_sections \
 680   _bfd_x86_elf_size_dynamic_sections
 681 #define elf_backend_always_size_sections \
 682   _bfd_x86_elf_always_size_sections
 683 #define elf_backend_merge_symbol_attribute \
 684   _bfd_x86_elf_merge_symbol_attribute
 685 #define elf_backend_copy_indirect_symbol \
 686   _bfd_x86_elf_copy_indirect_symbol
 687 #define elf_backend_fixup_symbol \
 688   _bfd_x86_elf_fixup_symbol
 689 #define elf_backend_hash_symbol \
 690   _bfd_x86_elf_hash_symbol
 691 #define elf_backend_adjust_dynamic_symbol \
 692   _bfd_x86_elf_adjust_dynamic_symbol
 693 #define elf_backend_gc_mark_hook \
 694   _bfd_x86_elf_gc_mark_hook
 695 #define elf_backend_omit_section_dynsym \
 696   ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
 697 #define elf_backend_parse_gnu_properties \
 698   _bfd_x86_elf_parse_gnu_properties
 699 #define elf_backend_merge_gnu_properties \
 700   _bfd_x86_elf_merge_gnu_properties