bfd/elfxx-x86.h

   1 /* x86 specific support for ELF
   2    Copyright (C) 2017-2019 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 "hashtab.h"
  27
  28 #define PLT_CIE_LENGTH          20
  29 #define PLT_FDE_LENGTH          36
  30 #define PLT_FDE_START_OFFSET    4 + PLT_CIE_LENGTH + 8
  31 #define PLT_FDE_LEN_OFFSET      4 + PLT_CIE_LENGTH + 12
  32
  33 #define ABI_64_P(abfd) \
  34   (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
  35
  36 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
  37    copying dynamic variables from a shared lib into an app's dynbss
  38    section, and instead use a dynamic relocation to point into the
  39    shared lib.  */
  40 #define ELIMINATE_COPY_RELOCS 1
  41
  42 #define elf_x86_hash_table(p, id) \
  43   (is_elf_hash_table ((p)->hash) \
  44    && elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \
  45     ? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL)
  46
  47 /* Will references to this symbol always be local in this object?  */
  48 #define SYMBOL_REFERENCES_LOCAL_P(INFO, H) \
  49   _bfd_x86_elf_link_symbol_references_local ((INFO), (H))
  50
  51 /* TRUE if an undefined weak symbol should be resolved to 0.  Local
  52    undefined weak symbol is always resolved to 0.  Reference to an
  53    undefined weak symbol is resolved to 0 in executable if undefined
  54    weak symbol should be resolved to 0 (zero_undefweak > 0).  */
  55 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
  56   ((EH)->elf.root.type == bfd_link_hash_undefweak                \
  57    && (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf)            \
  58        || (bfd_link_executable (INFO)                            \
  59            && (EH)->zero_undefweak > 0)))
  60
  61 /* Should copy relocation be generated for a symbol.  Don't generate
  62    copy relocation against a protected symbol defined in a shared
  63    object with GNU_PROPERTY_NO_COPY_ON_PROTECTED.  */
  64 #define SYMBOL_NO_COPYRELOC(INFO, EH) \
  65   ((EH)->def_protected \
  66    && ((EH)->elf.root.type == bfd_link_hash_defined \
  67        || (EH)->elf.root.type == bfd_link_hash_defweak) \
  68    && elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \
  69    && ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \
  70    && ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0)
  71
  72 /* TRUE if dynamic relocation is needed.  If we are creating a shared
  73    library, and this is a reloc against a global symbol, or a non PC
  74    relative reloc against a local symbol, then we need to copy the reloc
  75    into the shared library.  However, if we are linking with -Bsymbolic,
  76    we do not need to copy a reloc against a global symbol which is
  77    defined in an object we are including in the link (i.e., DEF_REGULAR
  78    is set).
  79
  80    If PCREL_PLT is true, don't generate dynamic relocation in PIE for
  81    PC-relative relocation against a dynamic function definition in data
  82    section when PLT address can be used.
  83
  84    If on the other hand, we are creating an executable, we may need to
  85    keep relocations for symbols satisfied by a dynamic library if we
  86    manage to avoid copy relocs for the symbol.
  87
  88    We also need to generate dynamic pointer relocation against
  89    STT_GNU_IFUNC symbol in the non-code section.  */
  90 #define NEED_DYNAMIC_RELOCATION_P(INFO, PCREL_PLT, H, SEC, R_TYPE, \
  91                                   POINTER_TYPE) \
  92   ((bfd_link_pic (INFO) \
  93     && (! X86_PCREL_TYPE_P (R_TYPE) \
  94         || ((H) != NULL \
  95             && (! (bfd_link_pie (INFO) \
  96                    || SYMBOLIC_BIND ((INFO), (H))) \
  97                 || (H)->root.type == bfd_link_hash_defweak \
  98                 || (!(bfd_link_pie (INFO) \
  99                       && (PCREL_PLT) \
 100                       && (H)->plt.refcount > 0 \
 101                       && ((SEC)->flags & SEC_CODE) == 0 \
 102                       && (H)->type == STT_FUNC \
 103                       && (H)->def_dynamic) \
 104                     && !(H)->def_regular))))) \
 105    || ((H) != NULL \
 106        && (H)->type == STT_GNU_IFUNC \
 107        && (R_TYPE) == POINTER_TYPE \
 108        && ((SEC)->flags & SEC_CODE) == 0) \
 109    || (ELIMINATE_COPY_RELOCS \
 110        && !bfd_link_pic (INFO) \
 111        && (H) != NULL \
 112        && ((H)->root.type == bfd_link_hash_defweak \
 113            || !(H)->def_regular)))
 114
 115 /* TRUE if dynamic relocation should be generated.  Don't copy a
 116    pc-relative relocation into the output file if the symbol needs
 117    copy reloc or the symbol is undefined when building executable.
 118    Copy dynamic function pointer relocations.  Don't generate dynamic
 119    relocations against resolved undefined weak symbols in PIE, except
 120    when PC32_RELOC is TRUE.  Undefined weak symbol is bound locally
 121    when PIC is false.  */
 122 #define GENERATE_DYNAMIC_RELOCATION_P(INFO, EH, R_TYPE, \
 123                                       NEED_COPY_RELOC_IN_PIE, \
 124                                       RESOLVED_TO_ZERO, PC32_RELOC) \
 125   ((bfd_link_pic (INFO) \
 126     && !(NEED_COPY_RELOC_IN_PIE) \
 127     && ((EH) == NULL \
 128         || ((ELF_ST_VISIBILITY ((EH)->elf.other) == STV_DEFAULT \
 129              && (!(RESOLVED_TO_ZERO) || PC32_RELOC)) \
 130             || (EH)->elf.root.type != bfd_link_hash_undefweak)) \
 131     && ((!X86_PCREL_TYPE_P (R_TYPE) \
 132          && !X86_SIZE_TYPE_P (R_TYPE)) \
 133          || ! SYMBOL_CALLS_LOCAL ((INFO), &(EH)->elf))) \
 134    || (ELIMINATE_COPY_RELOCS \
 135        && !bfd_link_pic (INFO) \
 136        && (EH) != NULL \
 137        && (EH)->elf.dynindx != -1 \
 138        && (!(EH)->elf.non_got_ref \
 139            || ((EH)->elf.root.type == bfd_link_hash_undefweak \
 140                && !(RESOLVED_TO_ZERO))) \
 141                && (((EH)->elf.def_dynamic && !(EH)->elf.def_regular) \
 142                    || (EH)->elf.root.type == bfd_link_hash_undefined)))
 143
 144 /* TRUE if this input relocation should be copied to output.  H->dynindx
 145    may be -1 if this symbol was marked to become local.  */
 146 #define COPY_INPUT_RELOC_P(INFO, H, R_TYPE) \
 147   ((H) != NULL \
 148    && (H)->dynindx != -1 \
 149    && (X86_PCREL_TYPE_P (R_TYPE) \
 150        || !(bfd_link_executable (INFO) || SYMBOLIC_BIND ((INFO), (H))) \
 151        || !(H)->def_regular))
 152
 153 /* TRUE if this is actually a static link, or it is a -Bsymbolic link
 154    and the symbol is defined locally, or the symbol was forced to be
 155    local because of a version file.  */
 156 #define RESOLVED_LOCALLY_P(INFO, H, HTAB) \
 157   (!WILL_CALL_FINISH_DYNAMIC_SYMBOL ((HTAB)->elf.dynamic_sections_created, \
 158                                      bfd_link_pic (INFO), (H)) \
 159    || (bfd_link_pic (INFO) \
 160        && SYMBOL_REFERENCES_LOCAL_P ((INFO), (H))) \
 161        || (ELF_ST_VISIBILITY ((H)->other) \
 162            && (H)->root.type == bfd_link_hash_undefweak))
 163
 164 /* TRUE if relative relocation should be generated.  GOT reference to
 165    global symbol in PIC will lead to dynamic symbol.  It becomes a
 166    problem when "time" or "times" is defined as a variable in an
 167    executable, clashing with functions of the same name in libc.  If a
 168    symbol isn't undefined weak symbol, don't make it dynamic in PIC and
 169    generate relative relocation.  */
 170 #define GENERATE_RELATIVE_RELOC_P(INFO, H) \
 171   ((H)->dynindx == -1 \
 172    && !(H)->forced_local \
 173    && (H)->root.type != bfd_link_hash_undefweak \
 174    && bfd_link_pic (INFO))
 175
 176 /* TRUE if this is a pointer reference to a local IFUNC.  */
 177 #define POINTER_LOCAL_IFUNC_P(INFO, H) \
 178   ((H)->dynindx == -1 \
 179    || (H)->forced_local \
 180    || bfd_link_executable (INFO))
 181
 182 /* TRUE if this is a PLT reference to a local IFUNC.  */
 183 #define PLT_LOCAL_IFUNC_P(INFO, H) \
 184   ((H)->dynindx == -1 \
 185    || ((bfd_link_executable (INFO) \
 186         || ELF_ST_VISIBILITY ((H)->other) != STV_DEFAULT) \
 187         && (H)->def_regular \
 188         && (H)->type == STT_GNU_IFUNC))
 189
 190 /* TRUE if TLS IE->LE transition is OK.  */
 191 #define TLS_TRANSITION_IE_TO_LE_P(INFO, H, TLS_TYPE) \
 192   (bfd_link_executable (INFO) \
 193    && (H) != NULL \
 194    && (H)->dynindx == -1 \
 195    && (TLS_TYPE & GOT_TLS_IE))
 196
 197 /* Verify that the symbol has an entry in the procedure linkage table.  */
 198 #define VERIFY_PLT_ENTRY(INFO, H, PLT, GOTPLT, RELPLT, LOCAL_UNDEFWEAK) \
 199   do \
 200     { \
 201       if (((H)->dynindx == -1 \
 202            && !LOCAL_UNDEFWEAK \
 203            && !(((H)->forced_local || bfd_link_executable (INFO)) \
 204                 && (H)->def_regular \
 205                 && (H)->type == STT_GNU_IFUNC)) \
 206           || (PLT) == NULL \
 207           || (GOTPLT) == NULL \
 208           || (RELPLT) == NULL) \
 209         abort (); \
 210     } \
 211   while (0);
 212
 213 /* Verify that the symbol supports copy relocation.  */
 214 #define VERIFY_COPY_RELOC(H, HTAB) \
 215   do \
 216     { \
 217       if ((H)->dynindx == -1 \
 218           || ((H)->root.type != bfd_link_hash_defined \
 219               && (H)->root.type != bfd_link_hash_defweak) \
 220           || (HTAB)->elf.srelbss == NULL \
 221           || (HTAB)->elf.sreldynrelro == NULL) \
 222         abort (); \
 223     } \
 224   while (0);
 225
 226 /* x86 ELF linker hash entry.  */
 227
 228 struct elf_x86_link_hash_entry
 229 {
 230   struct elf_link_hash_entry elf;
 231
 232   /* Track dynamic relocs copied for this symbol.  */
 233   struct elf_dyn_relocs *dyn_relocs;
 234
 235   unsigned char tls_type;
 236
 237   /* Bit 0: Symbol has no GOT nor PLT relocations.
 238      Bit 1: Symbol has non-GOT/non-PLT relocations in text sections.
 239      zero_undefweak is initialized to 1 and undefined weak symbol
 240      should be resolved to 0 if zero_undefweak > 0.  */
 241   unsigned int zero_undefweak : 2;
 242
 243   /* Don't call finish_dynamic_symbol on this symbol.  */
 244   unsigned int no_finish_dynamic_symbol : 1;
 245
 246   /* TRUE if symbol is __tls_get_addr.  */
 247   unsigned int tls_get_addr : 1;
 248
 249   /* TRUE if symbol is defined as a protected symbol.  */
 250   unsigned int def_protected : 1;
 251
 252   /* 0: Symbol references are unknown.
 253      1: Symbol references aren't local.
 254      2: Symbol references are local.
 255    */
 256   unsigned int local_ref : 2;
 257
 258   /* TRUE if symbol is defined by linker.  */
 259   unsigned int linker_def : 1;
 260
 261   /* TRUE if symbol is referenced by R_386_GOTOFF relocation.  This is
 262      only used by i386.  */
 263   unsigned int gotoff_ref : 1;
 264
 265   /* TRUE if a weak symbol with a real definition needs a copy reloc.
 266      When there is a weak symbol with a real definition, the processor
 267      independent code will have arranged for us to see the real
 268      definition first.  We need to copy the needs_copy bit from the
 269      real definition and check it when allowing copy reloc in PIE.  This
 270      is only used by x86-64.  */
 271   unsigned int needs_copy : 1;
 272
 273   /* Information about the GOT PLT entry. Filled when there are both
 274      GOT and PLT relocations against the same function.  */
 275   union gotplt_union plt_got;
 276
 277   /* Information about the second PLT entry.   */
 278   union gotplt_union plt_second;
 279
 280   /* Offset of the GOTPLT entry reserved for the TLS descriptor,
 281      starting at the end of the jump table.  */
 282   bfd_vma tlsdesc_got;
 283 };
 284
 285 struct elf_x86_lazy_plt_layout
 286 {
 287   /* The first entry in a lazy procedure linkage table looks like this.  */
 288   const bfd_byte *plt0_entry;
 289   unsigned int plt0_entry_size;          /* Size of PLT0 entry.  */
 290
 291   /* Later entries in a lazy procedure linkage table look like this.  */
 292   const bfd_byte *plt_entry;
 293   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 294
 295   /* The TLSDESC entry in a lazy procedure linkage table looks like
 296      this.  This is for x86-64 only.  */
 297   const bfd_byte *plt_tlsdesc_entry;
 298   unsigned int plt_tlsdesc_entry_size;   /* Size of TLSDESC entry.  */
 299
 300   /* Offsets into the TLSDESC entry that are to be replaced with
 301      GOT+8 and GOT+TDG.  These are for x86-64 only.  */
 302   unsigned int plt_tlsdesc_got1_offset;
 303   unsigned int plt_tlsdesc_got2_offset;
 304
 305   /* Offset of the end of the PC-relative instructions containing
 306      plt_tlsdesc_got1_offset and plt_tlsdesc_got2_offset.  These
 307      are for x86-64 only.  */
 308   unsigned int plt_tlsdesc_got1_insn_end;
 309   unsigned int plt_tlsdesc_got2_insn_end;
 310
 311   /* Offsets into plt0_entry that are to be replaced with GOT[1] and
 312      GOT[2].  */
 313   unsigned int plt0_got1_offset;
 314   unsigned int plt0_got2_offset;
 315
 316   /* Offset of the end of the PC-relative instruction containing
 317      plt0_got2_offset.  This is for x86-64 only.  */
 318   unsigned int plt0_got2_insn_end;
 319
 320   /* Offsets into plt_entry that are to be replaced with...  */
 321   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 322   unsigned int plt_reloc_offset;  /* ... offset into relocation table. */
 323   unsigned int plt_plt_offset;    /* ... offset to start of .plt. */
 324
 325   /* Length of the PC-relative instruction containing plt_got_offset.
 326      This is used for x86-64 only.  */
 327   unsigned int plt_got_insn_size;
 328
 329   /* Offset of the end of the PC-relative jump to plt0_entry.  This is
 330      used for x86-64 only.  */
 331   unsigned int plt_plt_insn_end;
 332
 333   /* Offset into plt_entry where the initial value of the GOT entry
 334      points.  */
 335   unsigned int plt_lazy_offset;
 336
 337   /* The first entry in a PIC lazy procedure linkage table looks like
 338      this.  */
 339   const bfd_byte *pic_plt0_entry;
 340
 341   /* Subsequent entries in a PIC lazy procedure linkage table look
 342      like this.  */
 343   const bfd_byte *pic_plt_entry;
 344
 345   /* .eh_frame covering the lazy .plt section.  */
 346   const bfd_byte *eh_frame_plt;
 347   unsigned int eh_frame_plt_size;
 348 };
 349
 350 struct elf_x86_non_lazy_plt_layout
 351 {
 352   /* Entries in a non-lazy procedure linkage table look like this.  */
 353   const bfd_byte *plt_entry;
 354   /* Entries in a PIC non-lazy procedure linkage table look like this.
 355      This is only used for i386 where absolute PLT and PIC PLT are
 356      different.  */
 357   const bfd_byte *pic_plt_entry;
 358
 359   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 360
 361   /* Offsets into plt_entry that are to be replaced with...  */
 362   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 363
 364   /* Length of the PC-relative instruction containing plt_got_offset.
 365      This is used for x86-64 only.  */
 366   unsigned int plt_got_insn_size;
 367
 368   /* .eh_frame covering the non-lazy .plt section.  */
 369   const bfd_byte *eh_frame_plt;
 370   unsigned int eh_frame_plt_size;
 371 };
 372
 373 struct elf_x86_plt_layout
 374 {
 375   /* The first entry in a lazy procedure linkage table looks like this.  */
 376   const bfd_byte *plt0_entry;
 377   /* Entries in a procedure linkage table look like this.  */
 378   const bfd_byte *plt_entry;
 379   unsigned int plt_entry_size;          /* Size of each PLT entry.  */
 380
 381   /* 1 has PLT0.  */
 382   unsigned int has_plt0;
 383
 384   /* Offsets into plt_entry that are to be replaced with...  */
 385   unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
 386
 387   /* Length of the PC-relative instruction containing plt_got_offset.
 388      This is only used for x86-64.  */
 389   unsigned int plt_got_insn_size;
 390
 391   /* Alignment of the .iplt section.  */
 392   unsigned int iplt_alignment;
 393
 394   /* .eh_frame covering the .plt section.  */
 395   const bfd_byte *eh_frame_plt;
 396   unsigned int eh_frame_plt_size;
 397 };
 398
 399 /* Values in tls_type of x86 ELF linker hash entry.  */
 400 #define GOT_UNKNOWN     0
 401 #define GOT_NORMAL      1
 402 #define GOT_TLS_GD      2
 403 #define GOT_TLS_IE      4
 404 #define GOT_TLS_IE_POS  5
 405 #define GOT_TLS_IE_NEG  6
 406 #define GOT_TLS_IE_BOTH 7
 407 #define GOT_TLS_GDESC   8
 408 #define GOT_TLS_GD_BOTH_P(type) \
 409   ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
 410 #define GOT_TLS_GD_P(type) \
 411   ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
 412 #define GOT_TLS_GDESC_P(type) \
 413   ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
 414 #define GOT_TLS_GD_ANY_P(type) \
 415   (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
 416
 417 #define elf_x86_hash_entry(ent) \
 418   ((struct elf_x86_link_hash_entry *)(ent))
 419
 420 enum elf_x86_target_os
 421 {
 422   is_normal,
 423   is_solaris,
 424   is_vxworks,
 425   is_nacl
 426 };
 427
 428 /* x86 ELF linker hash table.  */
 429
 430 struct elf_x86_link_hash_table
 431 {
 432   struct elf_link_hash_table elf;
 433
 434   /* Short-cuts to get to dynamic linker sections.  */
 435   asection *interp;
 436   asection *plt_eh_frame;
 437   asection *plt_second;
 438   asection *plt_second_eh_frame;
 439   asection *plt_got;
 440   asection *plt_got_eh_frame;
 441
 442   /* Parameters describing PLT generation, lazy or non-lazy.  */
 443   struct elf_x86_plt_layout plt;
 444
 445   /* Parameters describing lazy PLT generation.  */
 446   const struct elf_x86_lazy_plt_layout *lazy_plt;
 447
 448   /* Parameters describing non-lazy PLT generation.  */
 449   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 450
 451   union
 452   {
 453     bfd_signed_vma refcount;
 454     bfd_vma offset;
 455   } tls_ld_or_ldm_got;
 456
 457   /* The amount of space used by the jump slots in the GOT.  */
 458   bfd_vma sgotplt_jump_table_size;
 459
 460   /* Small local sym cache.  */
 461   struct sym_cache sym_cache;
 462
 463   /* _TLS_MODULE_BASE_ symbol.  */
 464   struct bfd_link_hash_entry *tls_module_base;
 465
 466   /* Used by local STT_GNU_IFUNC symbols.  */
 467   htab_t loc_hash_table;
 468   void * loc_hash_memory;
 469
 470   /* The offset into sgot of the GOT entry used by the PLT entry
 471      above.  */
 472   bfd_vma tlsdesc_got;
 473
 474   /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt.  */
 475   bfd_vma next_jump_slot_index;
 476   /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt.  */
 477   bfd_vma next_irelative_index;
 478
 479   /* TRUE if there are dynamic relocs against IFUNC symbols that apply
 480      to read-only sections.  */
 481   bfd_boolean readonly_dynrelocs_against_ifunc;
 482
 483   /* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
 484      This is used for i386 only.  */
 485   asection *srelplt2;
 486
 487   /* The index of the next unused R_386_TLS_DESC slot in .rel.plt.  This
 488      is only used for i386.  */
 489   bfd_vma next_tls_desc_index;
 490
 491   /* The offset into splt of the PLT entry for the TLS descriptor
 492      resolver.  Special values are 0, if not necessary (or not found
 493      to be necessary yet), and -1 if needed but not determined
 494      yet.  This is only used for x86-64.  */
 495   bfd_vma tlsdesc_plt;
 496
 497    /* Value used to fill the unused bytes of the first PLT entry.  This
 498       is only used for i386.  */
 499   bfd_byte plt0_pad_byte;
 500
 501   /* TRUE if GOT is referenced.  */
 502   unsigned int got_referenced : 1;
 503
 504   /* TRUE if PLT is PC-relative.  PLT in PDE and PC-relative PLT in PIE
 505      can be used as function address.
 506
 507      NB: i386 has non-PIC PLT and PIC PLT.  Only non-PIC PLT in PDE can
 508      be used as function address.  PIC PLT in PIE can't be used as
 509      function address.  */
 510   unsigned int pcrel_plt : 1;
 511
 512   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 513   bfd_vma (*r_sym) (bfd_vma);
 514   bfd_boolean (*is_reloc_section) (const char *);
 515   enum elf_target_id target_id;
 516   enum elf_x86_target_os target_os;
 517   unsigned int sizeof_reloc;
 518   unsigned int dt_reloc;
 519   unsigned int dt_reloc_sz;
 520   unsigned int dt_reloc_ent;
 521   unsigned int got_entry_size;
 522   unsigned int pointer_r_type;
 523   int dynamic_interpreter_size;
 524   const char *dynamic_interpreter;
 525   const char *tls_get_addr;
 526 };
 527
 528 /* Architecture-specific backend data for x86.  */
 529
 530 struct elf_x86_backend_data
 531 {
 532   /* Target system.  */
 533   enum elf_x86_target_os target_os;
 534 };
 535
 536 #define get_elf_x86_backend_data(abfd) \
 537   ((const struct elf_x86_backend_data *) \
 538    get_elf_backend_data (abfd)->arch_data)
 539
 540 struct elf_x86_init_table
 541 {
 542   /* The lazy PLT layout.  */
 543   const struct elf_x86_lazy_plt_layout *lazy_plt;
 544
 545   /* The non-lazy PLT layout.  */
 546   const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
 547
 548   /* The lazy PLT layout for IBT.  */
 549   const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
 550
 551   /* The non-lazy PLT layout for IBT.  */
 552   const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
 553
 554   bfd_byte plt0_pad_byte;
 555
 556   bfd_vma (*r_info) (bfd_vma, bfd_vma);
 557   bfd_vma (*r_sym) (bfd_vma);
 558 };
 559
 560 struct elf_x86_obj_tdata
 561 {
 562   struct elf_obj_tdata root;
 563
 564   /* tls_type for each local got entry.  */
 565   char *local_got_tls_type;
 566
 567   /* GOTPLT entries for TLS descriptors.  */
 568   bfd_vma *local_tlsdesc_gotent;
 569 };
 570
 571 enum elf_x86_plt_type
 572 {
 573   plt_non_lazy = 0,
 574   plt_lazy = 1 << 0,
 575   plt_pic = 1 << 1,
 576   plt_second = 1 << 2,
 577   plt_unknown = -1
 578 };
 579
 580 struct elf_x86_plt
 581 {
 582   const char *name;
 583   asection *sec;
 584   bfd_byte *contents;
 585   enum elf_x86_plt_type type;
 586   unsigned int plt_got_offset;
 587   unsigned int plt_entry_size;
 588   unsigned int plt_got_insn_size;       /* Only used for x86-64.  */
 589   long count;
 590 };
 591
 592 #define elf_x86_tdata(abfd) \
 593   ((struct elf_x86_obj_tdata *) (abfd)->tdata.any)
 594
 595 #define elf_x86_local_got_tls_type(abfd) \
 596   (elf_x86_tdata (abfd)->local_got_tls_type)
 597
 598 #define elf_x86_local_tlsdesc_gotent(abfd) \
 599   (elf_x86_tdata (abfd)->local_tlsdesc_gotent)
 600
 601 #define elf_x86_compute_jump_table_size(htab) \
 602   ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)
 603
 604 #define is_x86_elf(bfd, htab)                           \
 605   (bfd_get_flavour (bfd) == bfd_target_elf_flavour      \
 606    && elf_tdata (bfd) != NULL                           \
 607    && elf_object_id (bfd) == (htab)->target_id)
 608
 609 extern bfd_boolean _bfd_x86_elf_mkobject
 610   (bfd *);
 611
 612 extern void _bfd_x86_elf_set_tls_module_base
 613   (struct bfd_link_info *);
 614
 615 extern bfd_vma _bfd_x86_elf_dtpoff_base
 616   (struct bfd_link_info *);
 617
 618 extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
 619   (struct elf_link_hash_entry *, void *);
 620
 621 extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
 622   (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *,
 623    bfd_boolean);
 624
 625 extern hashval_t _bfd_x86_elf_local_htab_hash
 626   (const void *);
 627
 628 extern int _bfd_x86_elf_local_htab_eq
 629   (const void *, const void *);
 630
 631 extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
 632   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 633
 634 extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
 635   (bfd *);
 636
 637 extern int _bfd_x86_elf_compare_relocs
 638   (const void *, const void *);
 639
 640 extern bfd_boolean _bfd_x86_elf_link_check_relocs
 641   (bfd *, struct bfd_link_info *);
 642
 643 extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
 644   (bfd *, struct bfd_link_info *);
 645
 646 extern struct elf_x86_link_hash_table *_bfd_x86_elf_finish_dynamic_sections
 647   (bfd *, struct bfd_link_info *);
 648
 649 extern bfd_boolean _bfd_x86_elf_always_size_sections
 650   (bfd *, struct bfd_link_info *);
 651
 652 extern void _bfd_x86_elf_merge_symbol_attribute
 653   (struct elf_link_hash_entry *, const Elf_Internal_Sym *,
 654    bfd_boolean, bfd_boolean);
 655
 656 extern void _bfd_x86_elf_copy_indirect_symbol
 657   (struct bfd_link_info *, struct elf_link_hash_entry *,
 658    struct elf_link_hash_entry *);
 659
 660 extern bfd_boolean _bfd_x86_elf_fixup_symbol
 661   (struct bfd_link_info *, struct elf_link_hash_entry *);
 662
 663 extern bfd_boolean _bfd_x86_elf_hash_symbol
 664   (struct elf_link_hash_entry *);
 665
 666 extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
 667   (struct bfd_link_info *, struct elf_link_hash_entry *);
 668
 669 extern void _bfd_x86_elf_hide_symbol
 670   (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
 671
 672 extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
 673   (struct bfd_link_info *, struct elf_link_hash_entry *);
 674
 675 extern asection * _bfd_x86_elf_gc_mark_hook
 676   (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
 677    struct elf_link_hash_entry *, Elf_Internal_Sym *);
 678
 679 extern long _bfd_x86_elf_get_synthetic_symtab
 680   (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **,
 681    asymbol **);
 682
 683 extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
 684   (bfd *, unsigned int, bfd_byte *, unsigned int);
 685
 686 extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
 687   (struct bfd_link_info *, bfd *, elf_property *, elf_property *);
 688
 689 extern void _bfd_x86_elf_link_fixup_gnu_properties
 690   (struct bfd_link_info *, elf_property_list **);
 691
 692 extern bfd * _bfd_x86_elf_link_setup_gnu_properties
 693   (struct bfd_link_info *, struct elf_x86_init_table *);
 694
 695 extern void _bfd_x86_elf_link_fixup_ifunc_symbol
 696   (struct bfd_link_info *, struct elf_x86_link_hash_table *,
 697    struct elf_link_hash_entry *, Elf_Internal_Sym *sym);
 698
 699 #define bfd_elf64_mkobject \
 700   _bfd_x86_elf_mkobject
 701 #define bfd_elf32_mkobject \
 702   _bfd_x86_elf_mkobject
 703 #define bfd_elf64_bfd_link_hash_table_create \
 704   _bfd_x86_elf_link_hash_table_create
 705 #define bfd_elf32_bfd_link_hash_table_create \
 706   _bfd_x86_elf_link_hash_table_create
 707 #define bfd_elf64_bfd_link_check_relocs \
 708   _bfd_x86_elf_link_check_relocs
 709 #define bfd_elf32_bfd_link_check_relocs \
 710   _bfd_x86_elf_link_check_relocs
 711
 712 #define elf_backend_size_dynamic_sections \
 713   _bfd_x86_elf_size_dynamic_sections
 714 #define elf_backend_always_size_sections \
 715   _bfd_x86_elf_always_size_sections
 716 #define elf_backend_merge_symbol_attribute \
 717   _bfd_x86_elf_merge_symbol_attribute
 718 #define elf_backend_copy_indirect_symbol \
 719   _bfd_x86_elf_copy_indirect_symbol
 720 #define elf_backend_fixup_symbol \
 721   _bfd_x86_elf_fixup_symbol
 722 #define elf_backend_hash_symbol \
 723   _bfd_x86_elf_hash_symbol
 724 #define elf_backend_adjust_dynamic_symbol \
 725   _bfd_x86_elf_adjust_dynamic_symbol
 726 #define elf_backend_gc_mark_hook \
 727   _bfd_x86_elf_gc_mark_hook
 728 #define elf_backend_omit_section_dynsym \
 729   _bfd_elf_omit_section_dynsym_all
 730 #define elf_backend_parse_gnu_properties \
 731   _bfd_x86_elf_parse_gnu_properties
 732 #define elf_backend_merge_gnu_properties \
 733   _bfd_x86_elf_merge_gnu_properties
 734 #define elf_backend_fixup_gnu_properties \
 735   _bfd_x86_elf_link_fixup_gnu_properties