bfd/elf-bfd.h

   1 /* BFD back-end data structures for ELF files.
   2    Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
   3    2002, 2003, 2004, 2005 Free Software Foundation, Inc.
   4    Written by Cygnus Support.
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  21
  22 #ifndef _LIBELF_H_
  23 #define _LIBELF_H_ 1
  24
  25 #include "elf/common.h"
  26 #include "elf/internal.h"
  27 #include "elf/external.h"
  28 #include "bfdlink.h"
  29
  30 /* The number of entries in a section is its size divided by the size
  31    of a single entry.  This is normally only applicable to reloc and
  32    symbol table sections.  */
  33 #define NUM_SHDR_ENTRIES(shdr) ((shdr)->sh_size / (shdr)->sh_entsize)
  34
  35 /* If size isn't specified as 64 or 32, NAME macro should fail.  */
  36 #ifndef NAME
  37 #if ARCH_SIZE == 64
  38 #define NAME(x, y) x ## 64 ## _ ## y
  39 #endif
  40 #if ARCH_SIZE == 32
  41 #define NAME(x, y) x ## 32 ## _ ## y
  42 #endif
  43 #endif
  44
  45 #ifndef NAME
  46 #define NAME(x, y) x ## NOSIZE ## _ ## y
  47 #endif
  48
  49 #define ElfNAME(X)      NAME(Elf,X)
  50 #define elfNAME(X)      NAME(elf,X)
  51
  52 /* Information held for an ELF symbol.  The first field is the
  53    corresponding asymbol.  Every symbol is an ELF file is actually a
  54    pointer to this structure, although it is often handled as a
  55    pointer to an asymbol.  */
  56
  57 typedef struct
  58 {
  59   /* The BFD symbol.  */
  60   asymbol symbol;
  61   /* ELF symbol information.  */
  62   Elf_Internal_Sym internal_elf_sym;
  63   /* Backend specific information.  */
  64   union
  65     {
  66       unsigned int hppa_arg_reloc;
  67       void *mips_extr;
  68       void *any;
  69     }
  70   tc_data;
  71
  72   /* Version information.  This is from an Elf_Internal_Versym
  73      structure in a SHT_GNU_versym section.  It is zero if there is no
  74      version information.  */
  75   unsigned short version;
  76
  77 } elf_symbol_type;
  78 \f
  79 struct elf_strtab_hash;
  80 struct got_entry;
  81 struct plt_entry;
  82
  83 /* ELF linker hash table entries.  */
  84
  85 struct elf_link_hash_entry
  86 {
  87   struct bfd_link_hash_entry root;
  88
  89   /* Symbol index in output file.  This is initialized to -1.  It is
  90      set to -2 if the symbol is used by a reloc.  */
  91   long indx;
  92
  93   /* Symbol index as a dynamic symbol.  Initialized to -1, and remains
  94      -1 if this is not a dynamic symbol.  */
  95   /* ??? Note that this is consistently used as a synonym for tests
  96      against whether we can perform various simplifying transformations
  97      to the code.  (E.g. changing a pc-relative jump to a PLT entry
  98      into a pc-relative jump to the target function.)  That test, which
  99      is often relatively complex, and someplaces wrong or incomplete,
 100      should really be replaced by a predicate in elflink.c.
 101
 102      End result: this field -1 does not indicate that the symbol is
 103      not in the dynamic symbol table, but rather that the symbol is
 104      not visible outside this DSO.  */
 105   long dynindx;
 106
 107   /* If this symbol requires an entry in the global offset table, the
 108      processor specific backend uses this field to track usage and
 109      final offset.  Two schemes are supported:  The first assumes that
 110      a symbol may only have one GOT entry, and uses REFCOUNT until
 111      size_dynamic_sections, at which point the contents of the .got is
 112      fixed.  Afterward, if OFFSET is -1, then the symbol does not
 113      require a global offset table entry.  The second scheme allows
 114      multiple GOT entries per symbol, managed via a linked list
 115      pointed to by GLIST.  */
 116   union gotplt_union
 117     {
 118       bfd_signed_vma refcount;
 119       bfd_vma offset;
 120       struct got_entry *glist;
 121       struct plt_entry *plist;
 122     } got;
 123
 124   /* Same, but tracks a procedure linkage table entry.  */
 125   union gotplt_union plt;
 126
 127   /* Symbol size.  */
 128   bfd_size_type size;
 129
 130   /* Symbol type (STT_NOTYPE, STT_OBJECT, etc.).  */
 131   unsigned int type : 8;
 132
 133   /* Symbol st_other value, symbol visibility.  */
 134   unsigned int other : 8;
 135
 136   /* Symbol is referenced by a non-shared object.  */
 137   unsigned int ref_regular : 1;
 138   /* Symbol is defined by a non-shared object.  */
 139   unsigned int def_regular : 1;
 140   /* Symbol is referenced by a shared object.  */
 141   unsigned int ref_dynamic : 1;
 142   /* Symbol is defined by a shared object.  */
 143   unsigned int def_dynamic : 1;
 144   /* Symbol has a non-weak reference from a non-shared object.  */
 145   unsigned int ref_regular_nonweak : 1;
 146   /* Dynamic symbol has been adjustd.  */
 147   unsigned int dynamic_adjusted : 1;
 148   /* Symbol needs a copy reloc.  */
 149   unsigned int needs_copy : 1;
 150   /* Symbol needs a procedure linkage table entry.  */
 151   unsigned int needs_plt : 1;
 152   /* Symbol appears in a non-ELF input file.  */
 153   unsigned int non_elf : 1;
 154   /* Symbol should be marked as hidden in the version information.  */
 155   unsigned int hidden : 1;
 156   /* Symbol was forced to local scope due to a version script file.  */
 157   unsigned int forced_local : 1;
 158   /* Symbol was marked during garbage collection.  */
 159   unsigned int mark : 1;
 160   /* Symbol is referenced by a non-GOT/non-PLT relocation.  This is
 161      not currently set by all the backends.  */
 162   unsigned int non_got_ref : 1;
 163   /* Symbol has a definition in a shared object.
 164      FIXME: There is no real need for this field if def_dynamic is never
 165      cleared and all places that test def_dynamic also test def_regular.  */
 166   unsigned int dynamic_def : 1;
 167   /* Symbol is weak in all shared objects.  */
 168   unsigned int dynamic_weak : 1;
 169   /* Symbol is referenced with a relocation where C/C++ pointer equality
 170      matters.  */
 171   unsigned int pointer_equality_needed : 1;
 172
 173   /* String table index in .dynstr if this is a dynamic symbol.  */
 174   unsigned long dynstr_index;
 175
 176   union
 177   {
 178     /* If this is a weak defined symbol from a dynamic object, this
 179        field points to a defined symbol with the same value, if there is
 180        one.  Otherwise it is NULL.  */
 181     struct elf_link_hash_entry *weakdef;
 182
 183     /* Hash value of the name computed using the ELF hash function.
 184        Used part way through size_dynamic_sections, after we've finished
 185        with weakdefs.  */
 186     unsigned long elf_hash_value;
 187   } u;
 188
 189   /* Version information.  */
 190   union
 191   {
 192     /* This field is used for a symbol which is not defined in a
 193        regular object.  It points to the version information read in
 194        from the dynamic object.  */
 195     Elf_Internal_Verdef *verdef;
 196     /* This field is used for a symbol which is defined in a regular
 197        object.  It is set up in size_dynamic_sections.  It points to
 198        the version information we should write out for this symbol.  */
 199     struct bfd_elf_version_tree *vertree;
 200   } verinfo;
 201
 202   struct
 203   {
 204     /* Virtual table entry use information.  This array is nominally of size
 205        size/sizeof(target_void_pointer), though we have to be able to assume
 206        and track a size while the symbol is still undefined.  It is indexed
 207        via offset/sizeof(target_void_pointer).  */
 208     size_t size;
 209     bfd_boolean *used;
 210
 211     /* Virtual table derivation info.  */
 212     struct elf_link_hash_entry *parent;
 213   } *vtable;
 214 };
 215
 216 /* Will references to this symbol always reference the symbol
 217    in this object?  STV_PROTECTED is excluded from the visibility test
 218    here so that function pointer comparisons work properly.  Since
 219    function symbols not defined in an app are set to their .plt entry,
 220    it's necessary for shared libs to also reference the .plt even
 221    though the symbol is really local to the shared lib.  */
 222 #define SYMBOL_REFERENCES_LOCAL(INFO, H) \
 223   _bfd_elf_symbol_refs_local_p (H, INFO, 0)
 224
 225 /* Will _calls_ to this symbol always call the version in this object?  */
 226 #define SYMBOL_CALLS_LOCAL(INFO, H) \
 227   _bfd_elf_symbol_refs_local_p (H, INFO, 1)
 228
 229 /* Common symbols that are turned into definitions don't have the
 230    DEF_REGULAR flag set, so they might appear to be undefined.  */
 231 #define ELF_COMMON_DEF_P(H) \
 232   (!(H)->def_regular                                                    \
 233    && !(H)->def_dynamic                                                 \
 234    && (H)->root.type == bfd_link_hash_defined)
 235
 236 /* Records local symbols to be emitted in the dynamic symbol table.  */
 237
 238 struct elf_link_local_dynamic_entry
 239 {
 240   struct elf_link_local_dynamic_entry *next;
 241
 242   /* The input bfd this symbol came from.  */
 243   bfd *input_bfd;
 244
 245   /* The index of the local symbol being copied.  */
 246   long input_indx;
 247
 248   /* The index in the outgoing dynamic symbol table.  */
 249   long dynindx;
 250
 251   /* A copy of the input symbol.  */
 252   Elf_Internal_Sym isym;
 253 };
 254
 255 struct elf_link_loaded_list
 256 {
 257   struct elf_link_loaded_list *next;
 258   bfd *abfd;
 259 };
 260
 261 /* Structures used by the eh_frame optimization code.  */
 262 struct cie_header
 263 {
 264   unsigned int length;
 265   unsigned int id;
 266 };
 267
 268 struct cie
 269 {
 270   struct cie_header hdr;
 271   unsigned char version;
 272   char augmentation[20];
 273   bfd_vma code_align;
 274   bfd_signed_vma data_align;
 275   bfd_vma ra_column;
 276   bfd_vma augmentation_size;
 277   struct elf_link_hash_entry *personality;
 278   unsigned char per_encoding;
 279   unsigned char lsda_encoding;
 280   unsigned char fde_encoding;
 281   unsigned char initial_insn_length;
 282   unsigned char make_relative;
 283   unsigned char make_lsda_relative;
 284   unsigned char initial_instructions[50];
 285 };
 286
 287 struct eh_cie_fde
 288 {
 289   /* For FDEs, this points to the CIE used.  */
 290   struct eh_cie_fde *cie_inf;
 291   unsigned int size;
 292   unsigned int offset;
 293   unsigned int new_offset;
 294   unsigned char fde_encoding;
 295   unsigned char lsda_encoding;
 296   unsigned char lsda_offset;
 297   unsigned int cie : 1;
 298   unsigned int removed : 1;
 299   unsigned int add_augmentation_size : 1;
 300   unsigned int add_fde_encoding : 1;
 301   unsigned int make_relative : 1;
 302   unsigned int make_lsda_relative : 1;
 303   unsigned int need_lsda_relative : 1;
 304   unsigned int per_encoding_relative : 1;
 305 };
 306
 307 struct eh_frame_sec_info
 308 {
 309   unsigned int count;
 310   unsigned int alloced;
 311   struct eh_cie_fde entry[1];
 312 };
 313
 314 struct eh_frame_array_ent
 315 {
 316   bfd_vma initial_loc;
 317   bfd_vma fde;
 318 };
 319
 320 struct eh_frame_hdr_info
 321 {
 322   struct cie last_cie;
 323   asection *last_cie_sec;
 324   struct eh_cie_fde *last_cie_inf;
 325   asection *hdr_sec;
 326   unsigned int fde_count, array_count;
 327   struct eh_frame_array_ent *array;
 328   /* TRUE if .eh_frame_hdr should contain the sorted search table.
 329      We build it if we successfully read all .eh_frame input sections
 330      and recognize them.  */
 331   bfd_boolean table;
 332   bfd_boolean offsets_adjusted;
 333 };
 334
 335 /* ELF linker hash table.  */
 336
 337 struct elf_link_hash_table
 338 {
 339   struct bfd_link_hash_table root;
 340
 341   /* Whether we have created the special dynamic sections required
 342      when linking against or generating a shared object.  */
 343   bfd_boolean dynamic_sections_created;
 344
 345   /* The BFD used to hold special sections created by the linker.
 346      This will be the first BFD found which requires these sections to
 347      be created.  */
 348   bfd *dynobj;
 349
 350   /* The value to use when initialising got.refcount/offset and
 351      plt.refcount/offset in an elf_link_hash_entry.  Set to zero when
 352      the values are refcounts.  Set to init_got_offset/init_plt_offset
 353      in size_dynamic_sections when the values may be offsets.  */
 354   union gotplt_union init_got_refcount;
 355   union gotplt_union init_plt_refcount;
 356
 357   /* The value to use for got.refcount/offset and plt.refcount/offset
 358      when the values may be offsets.  Normally (bfd_vma) -1.  */
 359   union gotplt_union init_got_offset;
 360   union gotplt_union init_plt_offset;
 361
 362   /* The number of symbols found in the link which must be put into
 363      the .dynsym section.  */
 364   bfd_size_type dynsymcount;
 365
 366   /* The string table of dynamic symbols, which becomes the .dynstr
 367      section.  */
 368   struct elf_strtab_hash *dynstr;
 369
 370   /* The number of buckets in the hash table in the .hash section.
 371      This is based on the number of dynamic symbols.  */
 372   bfd_size_type bucketcount;
 373
 374   /* A linked list of DT_NEEDED names found in dynamic objects
 375      included in the link.  */
 376   struct bfd_link_needed_list *needed;
 377
 378   /* The _GLOBAL_OFFSET_TABLE_ symbol.  */
 379   struct elf_link_hash_entry *hgot;
 380
 381   /* A pointer to information used to merge SEC_MERGE sections.  */
 382   void *merge_info;
 383
 384   /* Used to link stabs in sections.  */
 385   struct stab_info stab_info;
 386
 387   /* Used by eh_frame code when editing .eh_frame.  */
 388   struct eh_frame_hdr_info eh_info;
 389
 390   /* A linked list of local symbols to be added to .dynsym.  */
 391   struct elf_link_local_dynamic_entry *dynlocal;
 392
 393   /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
 394      objects included in the link.  */
 395   struct bfd_link_needed_list *runpath;
 396
 397   /* Cached first output tls section and size of PT_TLS segment.  */
 398   asection *tls_sec;
 399   bfd_size_type tls_size;
 400
 401   /* A linked list of BFD's loaded in the link.  */
 402   struct elf_link_loaded_list *loaded;
 403
 404   /* True if this target has relocatable executables, so needs dynamic
 405      section symbols.  */
 406   bfd_boolean is_relocatable_executable;
 407 };
 408
 409 /* Look up an entry in an ELF linker hash table.  */
 410
 411 #define elf_link_hash_lookup(table, string, create, copy, follow)       \
 412   ((struct elf_link_hash_entry *)                                       \
 413    bfd_link_hash_lookup (&(table)->root, (string), (create),            \
 414                          (copy), (follow)))
 415
 416 /* Traverse an ELF linker hash table.  */
 417
 418 #define elf_link_hash_traverse(table, func, info)                       \
 419   (bfd_link_hash_traverse                                               \
 420    (&(table)->root,                                                     \
 421     (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func),    \
 422     (info)))
 423
 424 /* Get the ELF linker hash table from a link_info structure.  */
 425
 426 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
 427
 428 /* Returns TRUE if the hash table is a struct elf_link_hash_table.  */
 429 #define is_elf_hash_table(htab)                                         \
 430   (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
 431
 432 /* Used by bfd_section_from_r_symndx to cache a small number of local
 433    symbol to section mappings.  */
 434 #define LOCAL_SYM_CACHE_SIZE 32
 435 struct sym_sec_cache
 436 {
 437   bfd *abfd;
 438   unsigned long indx[LOCAL_SYM_CACHE_SIZE];
 439   asection *sec[LOCAL_SYM_CACHE_SIZE];
 440 };
 441 \f
 442 /* Constant information held for an ELF backend.  */
 443
 444 struct elf_size_info {
 445   unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
 446   unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
 447
 448   /* The size of entries in the .hash section.  */
 449   unsigned char sizeof_hash_entry;
 450
 451   /* The number of internal relocations to allocate per external
 452      relocation entry.  */
 453   unsigned char int_rels_per_ext_rel;
 454   /* We use some fixed size arrays.  This should be large enough to
 455      handle all back-ends.  */
 456 #define MAX_INT_RELS_PER_EXT_REL 3
 457
 458   unsigned char arch_size, log_file_align;
 459   unsigned char elfclass, ev_current;
 460   int (*write_out_phdrs)
 461     (bfd *, const Elf_Internal_Phdr *, unsigned int);
 462   bfd_boolean
 463     (*write_shdrs_and_ehdr) (bfd *);
 464   void (*write_relocs)
 465     (bfd *, asection *, void *);
 466   void (*swap_symbol_in)
 467     (bfd *, const void *, const void *, Elf_Internal_Sym *);
 468   void (*swap_symbol_out)
 469     (bfd *, const Elf_Internal_Sym *, void *, void *);
 470   bfd_boolean (*slurp_reloc_table)
 471     (bfd *, asection *, asymbol **, bfd_boolean);
 472   long (*slurp_symbol_table)
 473     (bfd *, asymbol **, bfd_boolean);
 474   void (*swap_dyn_in)
 475     (bfd *, const void *, Elf_Internal_Dyn *);
 476   void (*swap_dyn_out)
 477     (bfd *, const Elf_Internal_Dyn *, void *);
 478
 479   /* This function is called to swap in a REL relocation.  If an
 480      external relocation corresponds to more than one internal
 481      relocation, then all relocations are swapped in at once.  */
 482   void (*swap_reloc_in)
 483     (bfd *, const bfd_byte *, Elf_Internal_Rela *);
 484
 485   /* This function is called to swap out a REL relocation.  */
 486   void (*swap_reloc_out)
 487     (bfd *, const Elf_Internal_Rela *, bfd_byte *);
 488
 489   /* This function is called to swap in a RELA relocation.  If an
 490      external relocation corresponds to more than one internal
 491      relocation, then all relocations are swapped in at once.  */
 492   void (*swap_reloca_in)
 493     (bfd *, const bfd_byte *, Elf_Internal_Rela *);
 494
 495   /* This function is called to swap out a RELA relocation.  */
 496   void (*swap_reloca_out)
 497     (bfd *, const Elf_Internal_Rela *, bfd_byte *);
 498 };
 499
 500 #define elf_symbol_from(ABFD,S) \
 501         (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
 502           && (S)->the_bfd->tdata.elf_obj_data != 0) \
 503          ? (elf_symbol_type *) (S) \
 504          : 0)
 505
 506 enum elf_reloc_type_class {
 507   reloc_class_normal,
 508   reloc_class_relative,
 509   reloc_class_plt,
 510   reloc_class_copy
 511 };
 512
 513 struct elf_reloc_cookie
 514 {
 515   Elf_Internal_Rela *rels, *rel, *relend;
 516   Elf_Internal_Sym *locsyms;
 517   bfd *abfd;
 518   size_t locsymcount;
 519   size_t extsymoff;
 520   struct elf_link_hash_entry **sym_hashes;
 521   int r_sym_shift;
 522   bfd_boolean bad_symtab;
 523 };
 524
 525 /* The level of IRIX compatibility we're striving for.  */
 526
 527 typedef enum {
 528   ict_none,
 529   ict_irix5,
 530   ict_irix6
 531 } irix_compat_t;
 532
 533 /* Mapping of ELF section names and types.  */
 534 struct bfd_elf_special_section
 535 {
 536   const char *prefix;
 537   int prefix_length;
 538   /* 0 means name must match PREFIX exactly.
 539      -1 means name must start with PREFIX followed by an arbitrary string.
 540      -2 means name must match PREFIX exactly or consist of PREFIX followed
 541      by a dot then anything.
 542      > 0 means name must start with the first PREFIX_LENGTH chars of
 543      PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX.  */
 544   int suffix_length;
 545   int type;
 546   int attr;
 547 };
 548
 549 struct elf_backend_data
 550 {
 551   /* The architecture for this backend.  */
 552   enum bfd_architecture arch;
 553
 554   /* The ELF machine code (EM_xxxx) for this backend.  */
 555   int elf_machine_code;
 556
 557   /* The maximum page size for this backend.  */
 558   bfd_vma maxpagesize;
 559
 560   /* The minimum page size for this backend.  An input object will not be
 561      considered page aligned unless its sections are correctly aligned for
 562      pages at least this large.  May be smaller than maxpagesize.  */
 563   bfd_vma minpagesize;
 564
 565   /* The BFD flags applied to sections created for dynamic linking.  */
 566   flagword dynamic_sec_flags;
 567
 568   /* A function to translate an ELF RELA relocation to a BFD arelent
 569      structure.  */
 570   void (*elf_info_to_howto)
 571     (bfd *, arelent *, Elf_Internal_Rela *);
 572
 573   /* A function to translate an ELF REL relocation to a BFD arelent
 574      structure.  */
 575   void (*elf_info_to_howto_rel)
 576     (bfd *, arelent *, Elf_Internal_Rela *);
 577
 578   /* A function to determine whether a symbol is global when
 579      partitioning the symbol table into local and global symbols.
 580      This should be NULL for most targets, in which case the correct
 581      thing will be done.  MIPS ELF, at least on the Irix 5, has
 582      special requirements.  */
 583   bfd_boolean (*elf_backend_sym_is_global)
 584     (bfd *, asymbol *);
 585
 586   /* The remaining functions are hooks which are called only if they
 587      are not NULL.  */
 588
 589   /* A function to permit a backend specific check on whether a
 590      particular BFD format is relevant for an object file, and to
 591      permit the backend to set any global information it wishes.  When
 592      this is called elf_elfheader is set, but anything else should be
 593      used with caution.  If this returns FALSE, the check_format
 594      routine will return a bfd_error_wrong_format error.  */
 595   bfd_boolean (*elf_backend_object_p)
 596     (bfd *);
 597
 598   /* A function to do additional symbol processing when reading the
 599      ELF symbol table.  This is where any processor-specific special
 600      section indices are handled.  */
 601   void (*elf_backend_symbol_processing)
 602     (bfd *, asymbol *);
 603
 604   /* A function to do additional symbol processing after reading the
 605      entire ELF symbol table.  */
 606   bfd_boolean (*elf_backend_symbol_table_processing)
 607     (bfd *, elf_symbol_type *, unsigned int);
 608
 609   /* A function to set the type of the info field.  Processor-specific
 610      types should be handled here.  */
 611   int (*elf_backend_get_symbol_type)
 612     (Elf_Internal_Sym *, int);
 613
 614   /* A function to return the linker hash table entry of a symbol that
 615      might be satisfied by an archive symbol.  */
 616   struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
 617     (bfd *, struct bfd_link_info *, const char *);
 618
 619   /* Return true if local section symbols should have a non-null st_name.
 620      NULL implies false.  */
 621   bfd_boolean (*elf_backend_name_local_section_symbols)
 622     (bfd *);
 623
 624   /* A function to do additional processing on the ELF section header
 625      just before writing it out.  This is used to set the flags and
 626      type fields for some sections, or to actually write out data for
 627      unusual sections.  */
 628   bfd_boolean (*elf_backend_section_processing)
 629     (bfd *, Elf_Internal_Shdr *);
 630
 631   /* A function to handle unusual section types when creating BFD
 632      sections from ELF sections.  */
 633   bfd_boolean (*elf_backend_section_from_shdr)
 634     (bfd *, Elf_Internal_Shdr *, const char *, int);
 635
 636   /* A function to convert machine dependent section header flags to
 637      BFD internal section header flags.  */
 638   bfd_boolean (*elf_backend_section_flags)
 639     (flagword *, const Elf_Internal_Shdr *);
 640
 641   /* A function to handle unusual program segment types when creating BFD
 642      sections from ELF program segments.  */
 643   bfd_boolean (*elf_backend_section_from_phdr)
 644     (bfd *, Elf_Internal_Phdr *, int, const char *);
 645
 646   /* A function to set up the ELF section header for a BFD section in
 647      preparation for writing it out.  This is where the flags and type
 648      fields are set for unusual sections.  */
 649   bfd_boolean (*elf_backend_fake_sections)
 650     (bfd *, Elf_Internal_Shdr *, asection *);
 651
 652   /* A function to get the ELF section index for a BFD section.  If
 653      this returns TRUE, the section was found.  If it is a normal ELF
 654      section, *RETVAL should be left unchanged.  If it is not a normal
 655      ELF section *RETVAL should be set to the SHN_xxxx index.  */
 656   bfd_boolean (*elf_backend_section_from_bfd_section)
 657     (bfd *, asection *, int *retval);
 658
 659   /* If this field is not NULL, it is called by the add_symbols phase
 660      of a link just before adding a symbol to the global linker hash
 661      table.  It may modify any of the fields as it wishes.  If *NAME
 662      is set to NULL, the symbol will be skipped rather than being
 663      added to the hash table.  This function is responsible for
 664      handling all processor dependent symbol bindings and section
 665      indices, and must set at least *FLAGS and *SEC for each processor
 666      dependent case; failure to do so will cause a link error.  */
 667   bfd_boolean (*elf_add_symbol_hook)
 668     (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
 669      const char **name, flagword *flags, asection **sec, bfd_vma *value);
 670
 671   /* If this field is not NULL, it is called by the elf_link_output_sym
 672      phase of a link for each symbol which will appear in the object file.  */
 673   bfd_boolean (*elf_backend_link_output_symbol_hook)
 674     (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
 675      asection *, struct elf_link_hash_entry *);
 676
 677   /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
 678      linker the first time it encounters a dynamic object in the link.
 679      This function must create any sections required for dynamic
 680      linking.  The ABFD argument is a dynamic object.  The .interp,
 681      .dynamic, .dynsym, .dynstr, and .hash functions have already been
 682      created, and this function may modify the section flags if
 683      desired.  This function will normally create the .got and .plt
 684      sections, but different backends have different requirements.  */
 685   bfd_boolean (*elf_backend_create_dynamic_sections)
 686     (bfd *abfd, struct bfd_link_info *info);
 687
 688   /* When creating a shared library, determine whether to omit the
 689      dynamic symbol for the section.  */
 690   bfd_boolean (*elf_backend_omit_section_dynsym)
 691     (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
 692
 693   /* The CHECK_RELOCS function is called by the add_symbols phase of
 694      the ELF backend linker.  It is called once for each section with
 695      relocs of an object file, just after the symbols for the object
 696      file have been added to the global linker hash table.  The
 697      function must look through the relocs and do any special handling
 698      required.  This generally means allocating space in the global
 699      offset table, and perhaps allocating space for a reloc.  The
 700      relocs are always passed as Rela structures; if the section
 701      actually uses Rel structures, the r_addend field will always be
 702      zero.  */
 703   bfd_boolean (*check_relocs)
 704     (bfd *abfd, struct bfd_link_info *info, asection *o,
 705      const Elf_Internal_Rela *relocs);
 706
 707   /* The CHECK_DIRECTIVES function is called once per input file by
 708      the add_symbols phase of the ELF backend linker.  The function
 709      must inspect the bfd and create any additional symbols according
 710      to any custom directives in the bfd.  */
 711   bfd_boolean (*check_directives)
 712     (bfd *abfd, struct bfd_link_info *info);
 713
 714   /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
 715      linker for every symbol which is defined by a dynamic object and
 716      referenced by a regular object.  This is called after all the
 717      input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
 718      function has been called.  The hash table entry should be
 719      bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
 720      defined in a section from a dynamic object.  Dynamic object
 721      sections are not included in the final link, and this function is
 722      responsible for changing the value to something which the rest of
 723      the link can deal with.  This will normally involve adding an
 724      entry to the .plt or .got or some such section, and setting the
 725      symbol to point to that.  */
 726   bfd_boolean (*elf_backend_adjust_dynamic_symbol)
 727     (struct bfd_link_info *info, struct elf_link_hash_entry *h);
 728
 729   /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
 730      after all the linker input files have been seen but before the
 731      section sizes have been set.  This is called after
 732      ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS.  */
 733   bfd_boolean (*elf_backend_always_size_sections)
 734     (bfd *output_bfd, struct bfd_link_info *info);
 735
 736   /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
 737      linker after all the linker input files have been seen but before
 738      the sections sizes have been set.  This is called after
 739      ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
 740      It is only called when linking against a dynamic object.  It must
 741      set the sizes of the dynamic sections, and may fill in their
 742      contents as well.  The generic ELF linker can handle the .dynsym,
 743      .dynstr and .hash sections.  This function must handle the
 744      .interp section and any sections created by the
 745      CREATE_DYNAMIC_SECTIONS entry point.  */
 746   bfd_boolean (*elf_backend_size_dynamic_sections)
 747     (bfd *output_bfd, struct bfd_link_info *info);
 748
 749   /* The RELOCATE_SECTION function is called by the ELF backend linker
 750      to handle the relocations for a section.
 751
 752      The relocs are always passed as Rela structures; if the section
 753      actually uses Rel structures, the r_addend field will always be
 754      zero.
 755
 756      This function is responsible for adjust the section contents as
 757      necessary, and (if using Rela relocs and generating a
 758      relocatable output file) adjusting the reloc addend as
 759      necessary.
 760
 761      This function does not have to worry about setting the reloc
 762      address or the reloc symbol index.
 763
 764      LOCAL_SYMS is a pointer to the swapped in local symbols.
 765
 766      LOCAL_SECTIONS is an array giving the section in the input file
 767      corresponding to the st_shndx field of each local symbol.
 768
 769      The global hash table entry for the global symbols can be found
 770      via elf_sym_hashes (input_bfd).
 771
 772      When generating relocatable output, this function must handle
 773      STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
 774      going to be the section symbol corresponding to the output
 775      section, which means that the addend must be adjusted
 776      accordingly.  */
 777   bfd_boolean (*elf_backend_relocate_section)
 778     (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
 779      asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
 780      Elf_Internal_Sym *local_syms, asection **local_sections);
 781
 782   /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
 783      linker just before it writes a symbol out to the .dynsym section.
 784      The processor backend may make any required adjustment to the
 785      symbol.  It may also take the opportunity to set contents of the
 786      dynamic sections.  Note that FINISH_DYNAMIC_SYMBOL is called on
 787      all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
 788      on those symbols which are defined by a dynamic object.  */
 789   bfd_boolean (*elf_backend_finish_dynamic_symbol)
 790     (bfd *output_bfd, struct bfd_link_info *info,
 791      struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
 792
 793   /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
 794      linker just before it writes all the dynamic sections out to the
 795      output file.  The FINISH_DYNAMIC_SYMBOL will have been called on
 796      all dynamic symbols.  */
 797   bfd_boolean (*elf_backend_finish_dynamic_sections)
 798     (bfd *output_bfd, struct bfd_link_info *info);
 799
 800   /* A function to do any beginning processing needed for the ELF file
 801      before building the ELF headers and computing file positions.  */
 802   void (*elf_backend_begin_write_processing)
 803     (bfd *, struct bfd_link_info *);
 804
 805   /* A function to do any final processing needed for the ELF file
 806      before writing it out.  The LINKER argument is TRUE if this BFD
 807      was created by the ELF backend linker.  */
 808   void (*elf_backend_final_write_processing)
 809     (bfd *, bfd_boolean linker);
 810
 811   /* This function is called by get_program_header_size.  It should
 812      return the number of additional program segments which this BFD
 813      will need.  It should return -1 on error.  */
 814   int (*elf_backend_additional_program_headers)
 815     (bfd *);
 816
 817   /* This function is called to modify an existing segment map in a
 818      backend specific fashion.  */
 819   bfd_boolean (*elf_backend_modify_segment_map)
 820     (bfd *, struct bfd_link_info *);
 821
 822   /* This function is called during section gc to discover the section a
 823      particular relocation refers to.  */
 824   asection * (*gc_mark_hook)
 825     (asection *sec, struct bfd_link_info *, Elf_Internal_Rela *,
 826      struct elf_link_hash_entry *h, Elf_Internal_Sym *);
 827
 828   /* This function, if defined, is called during the sweep phase of gc
 829      in order that a backend might update any data structures it might
 830      be maintaining.  */
 831   bfd_boolean (*gc_sweep_hook)
 832     (bfd *abfd, struct bfd_link_info *info, asection *o,
 833      const Elf_Internal_Rela *relocs);
 834
 835   /* This function, if defined, is called after the ELF headers have
 836      been created.  This allows for things like the OS and ABI versions
 837      to be changed.  */
 838   void (*elf_backend_post_process_headers)
 839     (bfd *, struct bfd_link_info *);
 840
 841   /* This function, if defined, prints a symbol to file and returns the
 842      name of the symbol to be printed.  It should return NULL to fall
 843      back to default symbol printing.  */
 844   const char *(*elf_backend_print_symbol_all)
 845     (bfd *, void *, asymbol *);
 846
 847   /* This function, if defined, is called after all local symbols and
 848      global symbols converted to locals are emitted into the symtab
 849      section.  It allows the backend to emit special global symbols
 850      not handled in the hash table.  */
 851   bfd_boolean (*elf_backend_output_arch_syms)
 852     (bfd *, struct bfd_link_info *, void *,
 853      bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
 854                       struct elf_link_hash_entry *));
 855
 856   /* Copy any information related to dynamic linking from a pre-existing
 857      symbol to a newly created symbol.  Also called to copy flags and
 858      other back-end info to a weakdef, in which case the symbol is not
 859      newly created and plt/got refcounts and dynamic indices should not
 860      be copied.  */
 861   void (*elf_backend_copy_indirect_symbol)
 862     (const struct elf_backend_data *, struct elf_link_hash_entry *,
 863      struct elf_link_hash_entry *);
 864
 865   /* Modify any information related to dynamic linking such that the
 866      symbol is not exported.  */
 867   void (*elf_backend_hide_symbol)
 868     (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
 869
 870   /* Merge the backend specific symbol attribute.  */
 871   void (*elf_backend_merge_symbol_attribute)
 872     (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
 873      bfd_boolean);
 874
 875   /* Emit relocations.  Overrides default routine for emitting relocs,
 876      except during a relocatable link, or if all relocs are being emitted.  */
 877   bfd_boolean (*elf_backend_emit_relocs)
 878     (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
 879      struct elf_link_hash_entry **);
 880
 881   /* Count relocations.  Not called for relocatable links
 882      or if all relocs are being preserved in the output.  */
 883   unsigned int (*elf_backend_count_relocs)
 884     (asection *, Elf_Internal_Rela *);
 885
 886   /* This function, if defined, is called when an NT_PRSTATUS note is found
 887      in a core file. */
 888   bfd_boolean (*elf_backend_grok_prstatus)
 889     (bfd *, Elf_Internal_Note *);
 890
 891   /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
 892      note is found in a core file. */
 893   bfd_boolean (*elf_backend_grok_psinfo)
 894     (bfd *, Elf_Internal_Note *);
 895
 896   /* Functions to print VMAs.  Special code to handle 64 bit ELF files.  */
 897   void (* elf_backend_sprintf_vma)
 898     (bfd *, char *, bfd_vma);
 899   void (* elf_backend_fprintf_vma)
 900     (bfd *, void *, bfd_vma);
 901
 902   /* This function returns class of a reloc type.  */
 903   enum elf_reloc_type_class (*elf_backend_reloc_type_class)
 904     (const Elf_Internal_Rela *);
 905
 906   /* This function, if defined, removes information about discarded functions
 907      from other sections which mention them.  */
 908   bfd_boolean (*elf_backend_discard_info)
 909     (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
 910
 911   /* This function, if defined, signals that the function above has removed
 912      the discarded relocations for this section.  */
 913   bfd_boolean (*elf_backend_ignore_discarded_relocs)
 914     (asection *);
 915
 916   /* This function returns the width of FDE pointers in bytes, or 0 if
 917      that can't be determined for some reason.  The default definition
 918      goes by the bfd's EI_CLASS.  */
 919   unsigned int (*elf_backend_eh_frame_address_size)
 920     (bfd *, asection *);
 921
 922   /* These functions tell elf-eh-frame whether to attempt to turn
 923      absolute or lsda encodings into pc-relative ones.  The default
 924      definition enables these transformations.  */
 925   bfd_boolean (*elf_backend_can_make_relative_eh_frame)
 926      (bfd *, struct bfd_link_info *, asection *);
 927   bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
 928      (bfd *, struct bfd_link_info *, asection *);
 929
 930   /* This function returns an encoding after computing the encoded
 931      value (and storing it in ENCODED) for the given OFFSET into OSEC,
 932      to be stored in at LOC_OFFSET into the LOC_SEC input section.
 933      The default definition chooses a 32-bit PC-relative encoding.  */
 934   bfd_byte (*elf_backend_encode_eh_address)
 935      (bfd *abfd, struct bfd_link_info *info,
 936       asection *osec, bfd_vma offset,
 937       asection *loc_sec, bfd_vma loc_offset,
 938       bfd_vma *encoded);
 939
 940   /* This function, if defined, may write out the given section.
 941      Returns TRUE if it did so and FALSE if the caller should.  */
 942   bfd_boolean (*elf_backend_write_section)
 943     (bfd *, asection *, bfd_byte *);
 944
 945   /* The level of IRIX compatibility we're striving for.
 946      MIPS ELF specific function.  */
 947   irix_compat_t (*elf_backend_mips_irix_compat)
 948     (bfd *);
 949
 950   reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
 951     (unsigned int, bfd_boolean);
 952
 953   /* The swapping table to use when dealing with ECOFF information.
 954      Used for the MIPS ELF .mdebug section.  */
 955   const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
 956
 957   /* This function implements `bfd_elf_bfd_from_remote_memory';
 958      see elf.c, elfcode.h.  */
 959   bfd *(*elf_backend_bfd_from_remote_memory)
 960      (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
 961       int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
 962
 963   /* This function is used by `_bfd_elf_get_synthetic_symtab';
 964      see elf.c.  */
 965   bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
 966
 967   /* Used to handle bad SHF_LINK_ORDER input.  */
 968   bfd_error_handler_type link_order_error_handler;
 969
 970   /* Name of the PLT relocation section.  */
 971   const char *relplt_name;
 972
 973   /* Alternate EM_xxxx machine codes for this backend.  */
 974   int elf_machine_alt1;
 975   int elf_machine_alt2;
 976
 977   const struct elf_size_info *s;
 978
 979   /* An array of 27 target specific special section map arrays,
 980      covering 'a' to 'z', plus other.  */
 981   const struct bfd_elf_special_section **special_sections;
 982
 983   /* The size in bytes of the header for the GOT.  This includes the
 984      so-called reserved entries on some systems.  */
 985   bfd_vma got_header_size;
 986
 987   /* This is TRUE if the linker should act like collect and gather
 988      global constructors and destructors by name.  This is TRUE for
 989      MIPS ELF because the Irix 5 tools can not handle the .init
 990      section.  */
 991   unsigned collect : 1;
 992
 993   /* This is TRUE if the linker should ignore changes to the type of a
 994      symbol.  This is TRUE for MIPS ELF because some Irix 5 objects
 995      record undefined functions as STT_OBJECT although the definitions
 996      are STT_FUNC.  */
 997   unsigned type_change_ok : 1;
 998
 999   /* Whether the backend may use REL relocations.  (Some backends use
1000      both REL and RELA relocations, and this flag is set for those
1001      backends.)  */
1002   unsigned may_use_rel_p : 1;
1003
1004   /* Whether the backend may use RELA relocations.  (Some backends use
1005      both REL and RELA relocations, and this flag is set for those
1006      backends.)  */
1007   unsigned may_use_rela_p : 1;
1008
1009   /* Whether the default relocation type is RELA.  If a backend with
1010      this flag set wants REL relocations for a particular section,
1011      it must note that explicitly.  Similarly, if this flag is clear,
1012      and the backend wants RELA relocations for a particular
1013      section.  */
1014   unsigned default_use_rela_p : 1;
1015
1016   /* Set if RELA relocations for a relocatable link can be handled by
1017      generic code.  Backends that set this flag need do nothing in the
1018      backend relocate_section routine for relocatable linking.  */
1019   unsigned rela_normal : 1;
1020
1021   /* TRUE if addresses "naturally" sign extend.  This is used when
1022      swapping in from Elf32 when BFD64.  */
1023   unsigned sign_extend_vma : 1;
1024
1025   unsigned want_got_plt : 1;
1026   unsigned plt_readonly : 1;
1027   unsigned want_plt_sym : 1;
1028   unsigned plt_not_loaded : 1;
1029   unsigned plt_alignment : 4;
1030   unsigned can_gc_sections : 1;
1031   unsigned can_refcount : 1;
1032   unsigned want_got_sym : 1;
1033   unsigned want_dynbss : 1;
1034     /* Targets which do not support physical addressing often require
1035        that the p_paddr field in the section header to be set to zero.
1036        This field indicates whether this behavior is required.  */
1037   unsigned want_p_paddr_set_to_zero : 1;
1038 };
1039
1040 /* Information stored for each BFD section in an ELF file.  This
1041    structure is allocated by elf_new_section_hook.  */
1042
1043 struct bfd_elf_section_data
1044 {
1045   /* The ELF header for this section.  */
1046   Elf_Internal_Shdr this_hdr;
1047
1048   /* The ELF header for the reloc section associated with this
1049      section, if any.  */
1050   Elf_Internal_Shdr rel_hdr;
1051
1052   /* If there is a second reloc section associated with this section,
1053      as can happen on Irix 6, this field points to the header.  */
1054   Elf_Internal_Shdr *rel_hdr2;
1055
1056   /* The number of relocations currently assigned to REL_HDR.  */
1057   unsigned int rel_count;
1058
1059   /* The number of relocations currently assigned to REL_HDR2.  */
1060   unsigned int rel_count2;
1061
1062   /* The ELF section number of this section.  */
1063   int this_idx;
1064
1065   /* The ELF section number of the reloc section indicated by
1066      REL_HDR if any.  Only used for an output file.  */
1067   int rel_idx;
1068
1069   /* The ELF section number of the reloc section indicated by
1070      REL_HDR2 if any.  Only used for an output file.  */
1071   int rel_idx2;
1072
1073   /* Used by the backend linker when generating a shared library to
1074      record the dynamic symbol index for a section symbol
1075      corresponding to this section.  A value of 0 means that there is
1076      no dynamic symbol for this section.  */
1077   int dynindx;
1078
1079   /* A pointer to the linked-to section for SHF_LINK_ORDER.  */
1080   asection *linked_to;
1081
1082   /* Used by the backend linker to store the symbol hash table entries
1083      associated with relocs against global symbols.  */
1084   struct elf_link_hash_entry **rel_hashes;
1085
1086   /* A pointer to the swapped relocs.  If the section uses REL relocs,
1087      rather than RELA, all the r_addend fields will be zero.  This
1088      pointer may be NULL.  It is used by the backend linker.  */
1089   Elf_Internal_Rela *relocs;
1090
1091   /* A pointer to a linked list tracking dynamic relocs copied for
1092      local symbols.  */
1093   void *local_dynrel;
1094
1095   /* A pointer to the bfd section used for dynamic relocs.  */
1096   asection *sreloc;
1097
1098   union {
1099     /* Group name, if this section is a member of a group.  */
1100     const char *name;
1101
1102     /* Group signature sym, if this is the SHT_GROUP section.  */
1103     struct bfd_symbol *id;
1104   } group;
1105
1106   /* Optional information about section group; NULL if it doesn't
1107      belongs to any section group. */
1108   asection *sec_group;
1109
1110   /* A linked list of sections in the group.  Circular when used by
1111      the linker.  */
1112   asection *next_in_group;
1113
1114   /* A pointer used for various section optimizations.  */
1115   void *sec_info;
1116 };
1117
1118 #define elf_section_data(sec)  ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1119 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1120 #define elf_section_type(sec)  (elf_section_data(sec)->this_hdr.sh_type)
1121 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1122 #define elf_group_name(sec)    (elf_section_data(sec)->group.name)
1123 #define elf_group_id(sec)      (elf_section_data(sec)->group.id)
1124 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1125 #define elf_sec_group(sec)      (elf_section_data(sec)->sec_group)
1126
1127 /* Return TRUE if section has been discarded.  */
1128 #define elf_discarded_section(sec)                              \
1129   (!bfd_is_abs_section (sec)                                    \
1130    && bfd_is_abs_section ((sec)->output_section)                \
1131    && (sec)->sec_info_type != ELF_INFO_TYPE_MERGE               \
1132    && (sec)->sec_info_type != ELF_INFO_TYPE_JUST_SYMS)
1133
1134 #define get_elf_backend_data(abfd) \
1135   ((const struct elf_backend_data *) (abfd)->xvec->backend_data)
1136
1137 /* This struct is used to pass information to routines called via
1138    elf_link_hash_traverse which must return failure.  */
1139
1140 struct elf_info_failed
1141 {
1142   bfd_boolean failed;
1143   struct bfd_link_info *info;
1144   struct bfd_elf_version_tree *verdefs;
1145 };
1146
1147 /* This structure is used to pass information to
1148    _bfd_elf_link_assign_sym_version.  */
1149
1150 struct elf_assign_sym_version_info
1151 {
1152   /* Output BFD.  */
1153   bfd *output_bfd;
1154   /* General link information.  */
1155   struct bfd_link_info *info;
1156   /* Version tree.  */
1157   struct bfd_elf_version_tree *verdefs;
1158   /* Whether we had a failure.  */
1159   bfd_boolean failed;
1160 };
1161
1162 /* This structure is used to pass information to
1163    _bfd_elf_link_find_version_dependencies.  */
1164
1165 struct elf_find_verdep_info
1166 {
1167   /* Output BFD.  */
1168   bfd *output_bfd;
1169   /* General link information.  */
1170   struct bfd_link_info *info;
1171   /* The number of dependencies.  */
1172   unsigned int vers;
1173   /* Whether we had a failure.  */
1174   bfd_boolean failed;
1175 };
1176
1177 /* Some private data is stashed away for future use using the tdata pointer
1178    in the bfd structure.  */
1179
1180 struct elf_obj_tdata
1181 {
1182   Elf_Internal_Ehdr elf_header[1];      /* Actual data, but ref like ptr */
1183   Elf_Internal_Shdr **elf_sect_ptr;
1184   Elf_Internal_Phdr *phdr;
1185   struct elf_segment_map *segment_map;
1186   struct elf_strtab_hash *strtab_ptr;
1187   int num_locals;
1188   int num_globals;
1189   unsigned int num_elf_sections;        /* elf_sect_ptr size */
1190   int num_section_syms;
1191   asymbol **section_syms;               /* STT_SECTION symbols for each section */
1192   Elf_Internal_Shdr symtab_hdr;
1193   Elf_Internal_Shdr shstrtab_hdr;
1194   Elf_Internal_Shdr strtab_hdr;
1195   Elf_Internal_Shdr dynsymtab_hdr;
1196   Elf_Internal_Shdr dynstrtab_hdr;
1197   Elf_Internal_Shdr dynversym_hdr;
1198   Elf_Internal_Shdr dynverref_hdr;
1199   Elf_Internal_Shdr dynverdef_hdr;
1200   Elf_Internal_Shdr symtab_shndx_hdr;
1201   unsigned int symtab_section, shstrtab_section;
1202   unsigned int strtab_section, dynsymtab_section;
1203   unsigned int symtab_shndx_section;
1204   unsigned int dynversym_section, dynverdef_section, dynverref_section;
1205   file_ptr next_file_pos;
1206   bfd_vma gp;                           /* The gp value */
1207   unsigned int gp_size;                 /* The gp size */
1208
1209   /* Information grabbed from an elf core file.  */
1210   int core_signal;
1211   int core_pid;
1212   int core_lwpid;
1213   char* core_program;
1214   char* core_command;
1215
1216   /* A mapping from external symbols to entries in the linker hash
1217      table, used when linking.  This is indexed by the symbol index
1218      minus the sh_info field of the symbol table header.  */
1219   struct elf_link_hash_entry **sym_hashes;
1220
1221   /* Track usage and final offsets of GOT entries for local symbols.
1222      This array is indexed by symbol index.  Elements are used
1223      identically to "got" in struct elf_link_hash_entry.  */
1224   union
1225     {
1226       bfd_signed_vma *refcounts;
1227       bfd_vma *offsets;
1228       struct got_entry **ents;
1229     } local_got;
1230
1231   /* The linker ELF emulation code needs to let the backend ELF linker
1232      know what filename should be used for a dynamic object if the
1233      dynamic object is found using a search.  The emulation code then
1234      sometimes needs to know what name was actually used.  Until the
1235      file has been added to the linker symbol table, this field holds
1236      the name the linker wants.  After it has been added, it holds the
1237      name actually used, which will be the DT_SONAME entry if there is
1238      one.  */
1239   const char *dt_name;
1240
1241   /* Records the result of `get_program_header_size'.  */
1242   bfd_size_type program_header_size;
1243
1244   /* Used by find_nearest_line entry point.  */
1245   void *line_info;
1246
1247   /* Used by MIPS ELF find_nearest_line entry point.  The structure
1248      could be included directly in this one, but there's no point to
1249      wasting the memory just for the infrequently called
1250      find_nearest_line.  */
1251   struct mips_elf_find_line *find_line_info;
1252
1253   /* A place to stash dwarf1 info for this bfd.  */
1254   struct dwarf1_debug *dwarf1_find_line_info;
1255
1256   /* A place to stash dwarf2 info for this bfd.  */
1257   void *dwarf2_find_line_info;
1258
1259   /* An array of stub sections indexed by symbol number, used by the
1260      MIPS ELF linker.  FIXME: We should figure out some way to only
1261      include this field for a MIPS ELF target.  */
1262   asection **local_stubs;
1263
1264   /* Used to determine if PT_GNU_EH_FRAME segment header should be
1265      created.  */
1266   asection *eh_frame_hdr;
1267
1268   Elf_Internal_Shdr **group_sect_ptr;
1269   int num_group;
1270
1271   /* Number of symbol version definitions we are about to emit.  */
1272   unsigned int cverdefs;
1273
1274   /* Number of symbol version references we are about to emit.  */
1275   unsigned int cverrefs;
1276
1277   /* Segment flags for the PT_GNU_STACK segment.  */
1278   unsigned int stack_flags;
1279
1280   /* Should the PT_GNU_RELRO segment be emitted?  */
1281   bfd_boolean relro;
1282
1283   /* Symbol version definitions in external objects.  */
1284   Elf_Internal_Verdef *verdef;
1285
1286   /* Symbol version references to external objects.  */
1287   Elf_Internal_Verneed *verref;
1288
1289   /* The Irix 5 support uses two virtual sections, which represent
1290      text/data symbols defined in dynamic objects.  */
1291   asymbol *elf_data_symbol;
1292   asymbol *elf_text_symbol;
1293   asection *elf_data_section;
1294   asection *elf_text_section;
1295
1296   /* Whether a dyanmic object was specified normally on the linker
1297      command line, or was specified when --as-needed was in effect,
1298      or was found via a DT_NEEDED entry.  */
1299   enum dynamic_lib_link_class dyn_lib_class;
1300
1301   /* This is set to TRUE if the object was created by the backend
1302      linker.  */
1303   bfd_boolean linker;
1304
1305   /* Irix 5 often screws up the symbol table, sorting local symbols
1306      after global symbols.  This flag is set if the symbol table in
1307      this BFD appears to be screwed up.  If it is, we ignore the
1308      sh_info field in the symbol table header, and always read all the
1309      symbols.  */
1310   bfd_boolean bad_symtab;
1311
1312   /* Used to determine if the e_flags field has been initialized */
1313   bfd_boolean flags_init;
1314 };
1315
1316 #define elf_tdata(bfd)          ((bfd) -> tdata.elf_obj_data)
1317 #define elf_elfheader(bfd)      (elf_tdata(bfd) -> elf_header)
1318 #define elf_elfsections(bfd)    (elf_tdata(bfd) -> elf_sect_ptr)
1319 #define elf_numsections(bfd)    (elf_tdata(bfd) -> num_elf_sections)
1320 #define elf_shstrtab(bfd)       (elf_tdata(bfd) -> strtab_ptr)
1321 #define elf_onesymtab(bfd)      (elf_tdata(bfd) -> symtab_section)
1322 #define elf_symtab_shndx(bfd)   (elf_tdata(bfd) -> symtab_shndx_section)
1323 #define elf_dynsymtab(bfd)      (elf_tdata(bfd) -> dynsymtab_section)
1324 #define elf_dynversym(bfd)      (elf_tdata(bfd) -> dynversym_section)
1325 #define elf_dynverdef(bfd)      (elf_tdata(bfd) -> dynverdef_section)
1326 #define elf_dynverref(bfd)      (elf_tdata(bfd) -> dynverref_section)
1327 #define elf_num_locals(bfd)     (elf_tdata(bfd) -> num_locals)
1328 #define elf_num_globals(bfd)    (elf_tdata(bfd) -> num_globals)
1329 #define elf_section_syms(bfd)   (elf_tdata(bfd) -> section_syms)
1330 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1331 #define core_prpsinfo(bfd)      (elf_tdata(bfd) -> prpsinfo)
1332 #define core_prstatus(bfd)      (elf_tdata(bfd) -> prstatus)
1333 #define elf_gp(bfd)             (elf_tdata(bfd) -> gp)
1334 #define elf_gp_size(bfd)        (elf_tdata(bfd) -> gp_size)
1335 #define elf_sym_hashes(bfd)     (elf_tdata(bfd) -> sym_hashes)
1336 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1337 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1338 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1339 #define elf_dt_name(bfd)        (elf_tdata(bfd) -> dt_name)
1340 #define elf_dyn_lib_class(bfd)  (elf_tdata(bfd) -> dyn_lib_class)
1341 #define elf_bad_symtab(bfd)     (elf_tdata(bfd) -> bad_symtab)
1342 #define elf_flags_init(bfd)     (elf_tdata(bfd) -> flags_init)
1343 \f
1344 extern void _bfd_elf_swap_verdef_in
1345   (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1346 extern void _bfd_elf_swap_verdef_out
1347   (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1348 extern void _bfd_elf_swap_verdaux_in
1349   (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1350 extern void _bfd_elf_swap_verdaux_out
1351   (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1352 extern void _bfd_elf_swap_verneed_in
1353   (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1354 extern void _bfd_elf_swap_verneed_out
1355   (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1356 extern void _bfd_elf_swap_vernaux_in
1357   (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1358 extern void _bfd_elf_swap_vernaux_out
1359   (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1360 extern void _bfd_elf_swap_versym_in
1361   (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1362 extern void _bfd_elf_swap_versym_out
1363   (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1364
1365 extern int _bfd_elf_section_from_bfd_section
1366   (bfd *, asection *);
1367 extern char *bfd_elf_string_from_elf_section
1368   (bfd *, unsigned, unsigned);
1369 extern char *bfd_elf_get_str_section
1370   (bfd *, unsigned);
1371 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1372   (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1373    Elf_External_Sym_Shndx *);
1374 extern const char *bfd_elf_sym_name
1375   (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1376
1377 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1378   (bfd *, bfd *);
1379 extern bfd_boolean _bfd_elf_print_private_bfd_data
1380   (bfd *, void *);
1381 extern void bfd_elf_print_symbol
1382   (bfd *, void *, asymbol *, bfd_print_symbol_type);
1383
1384 extern void _bfd_elf_sprintf_vma
1385   (bfd *, char *, bfd_vma);
1386 extern void _bfd_elf_fprintf_vma
1387   (bfd *, void *, bfd_vma);
1388
1389 extern unsigned int _bfd_elf_eh_frame_address_size
1390   (bfd *, asection *);
1391 extern bfd_byte _bfd_elf_encode_eh_address
1392   (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1393    asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1394 extern bfd_boolean _bfd_elf_can_make_relative
1395   (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1396
1397 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1398   (const Elf_Internal_Rela *);
1399 extern bfd_vma _bfd_elf_rela_local_sym
1400   (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1401 extern bfd_vma _bfd_elf_rel_local_sym
1402   (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1403 extern bfd_vma _bfd_elf_section_offset
1404   (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1405
1406 extern unsigned long bfd_elf_hash
1407   (const char *);
1408
1409 extern bfd_reloc_status_type bfd_elf_generic_reloc
1410   (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1411 extern bfd_boolean bfd_elf_mkobject
1412   (bfd *);
1413 extern bfd_boolean bfd_elf_mkcorefile
1414   (bfd *);
1415 extern Elf_Internal_Shdr *bfd_elf_find_section
1416   (bfd *, char *);
1417 extern bfd_boolean _bfd_elf_make_section_from_shdr
1418   (bfd *, Elf_Internal_Shdr *, const char *, int);
1419 extern bfd_boolean _bfd_elf_make_section_from_phdr
1420   (bfd *, Elf_Internal_Phdr *, int, const char *);
1421 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1422   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1423 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1424   (bfd *);
1425 extern void _bfd_elf_link_hash_copy_indirect
1426   (const struct elf_backend_data *, struct elf_link_hash_entry *,
1427    struct elf_link_hash_entry *);
1428 extern void _bfd_elf_link_hash_hide_symbol
1429   (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1430 extern bfd_boolean _bfd_elf_link_hash_table_init
1431   (struct elf_link_hash_table *, bfd *,
1432    struct bfd_hash_entry *(*)
1433      (struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
1434 extern bfd_boolean _bfd_elf_slurp_version_tables
1435   (bfd *, bfd_boolean);
1436 extern bfd_boolean _bfd_elf_merge_sections
1437   (bfd *, struct bfd_link_info *);
1438 extern bfd_boolean bfd_elf_is_group_section
1439   (bfd *, const struct bfd_section *);
1440 extern void _bfd_elf_section_already_linked
1441   (bfd *, struct bfd_section *);
1442 extern void bfd_elf_set_group_contents
1443   (bfd *, asection *, void *);
1444 extern asection *_bfd_elf_check_kept_section
1445   (asection *);
1446 extern void _bfd_elf_link_just_syms
1447   (asection *, struct bfd_link_info *);
1448 extern bfd_boolean _bfd_elf_copy_private_header_data
1449   (bfd *, bfd *);
1450 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1451   (bfd *, asymbol *, bfd *, asymbol *);
1452 extern bfd_boolean _bfd_elf_copy_private_section_data
1453   (bfd *, asection *, bfd *, asection *);
1454 extern bfd_boolean _bfd_elf_write_object_contents
1455   (bfd *);
1456 extern bfd_boolean _bfd_elf_write_corefile_contents
1457   (bfd *);
1458 extern bfd_boolean _bfd_elf_set_section_contents
1459   (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1460 extern long _bfd_elf_get_symtab_upper_bound
1461   (bfd *);
1462 extern long _bfd_elf_canonicalize_symtab
1463   (bfd *, asymbol **);
1464 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1465   (bfd *);
1466 extern long _bfd_elf_canonicalize_dynamic_symtab
1467   (bfd *, asymbol **);
1468 extern long _bfd_elf_get_synthetic_symtab
1469   (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1470 extern long _bfd_elf_get_reloc_upper_bound
1471   (bfd *, sec_ptr);
1472 extern long _bfd_elf_canonicalize_reloc
1473   (bfd *, sec_ptr, arelent **, asymbol **);
1474 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1475   (bfd *);
1476 extern long _bfd_elf_canonicalize_dynamic_reloc
1477   (bfd *, arelent **, asymbol **);
1478 extern asymbol *_bfd_elf_make_empty_symbol
1479   (bfd *);
1480 extern void _bfd_elf_get_symbol_info
1481   (bfd *, asymbol *, symbol_info *);
1482 extern bfd_boolean _bfd_elf_is_local_label_name
1483   (bfd *, const char *);
1484 extern alent *_bfd_elf_get_lineno
1485   (bfd *, asymbol *);
1486 extern bfd_boolean _bfd_elf_set_arch_mach
1487   (bfd *, enum bfd_architecture, unsigned long);
1488 extern bfd_boolean _bfd_elf_find_nearest_line
1489   (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1490    unsigned int *);
1491 extern bfd_boolean _bfd_elf_find_inliner_info
1492   (bfd *, const char **, const char **, unsigned int *);
1493 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1494 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1495 extern int _bfd_elf_sizeof_headers
1496   (bfd *, bfd_boolean);
1497 extern bfd_boolean _bfd_elf_new_section_hook
1498   (bfd *, asection *);
1499 extern bfd_boolean _bfd_elf_init_reloc_shdr
1500   (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean);
1501 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1502   (bfd *, const char *);
1503
1504 /* If the target doesn't have reloc handling written yet:  */
1505 extern void _bfd_elf_no_info_to_howto
1506   (bfd *, arelent *, Elf_Internal_Rela *);
1507
1508 extern bfd_boolean bfd_section_from_shdr
1509   (bfd *, unsigned int shindex);
1510 extern bfd_boolean bfd_section_from_phdr
1511   (bfd *, Elf_Internal_Phdr *, int);
1512
1513 extern int _bfd_elf_symbol_from_bfd_symbol
1514   (bfd *, asymbol **);
1515
1516 extern asection *bfd_section_from_r_symndx
1517   (bfd *, struct sym_sec_cache *, asection *, unsigned long);
1518 extern asection *bfd_section_from_elf_index
1519   (bfd *, unsigned int);
1520 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1521   (void);
1522
1523 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1524   (void);
1525 extern void _bfd_elf_strtab_free
1526   (struct elf_strtab_hash *);
1527 extern bfd_size_type _bfd_elf_strtab_add
1528   (struct elf_strtab_hash *, const char *, bfd_boolean);
1529 extern void _bfd_elf_strtab_addref
1530   (struct elf_strtab_hash *, bfd_size_type);
1531 extern void _bfd_elf_strtab_delref
1532   (struct elf_strtab_hash *, bfd_size_type);
1533 extern void _bfd_elf_strtab_clear_all_refs
1534   (struct elf_strtab_hash *);
1535 extern bfd_size_type _bfd_elf_strtab_size
1536   (struct elf_strtab_hash *);
1537 extern bfd_size_type _bfd_elf_strtab_offset
1538   (struct elf_strtab_hash *, bfd_size_type);
1539 extern bfd_boolean _bfd_elf_strtab_emit
1540   (bfd *, struct elf_strtab_hash *);
1541 extern void _bfd_elf_strtab_finalize
1542   (struct elf_strtab_hash *);
1543
1544 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1545   (bfd *, struct bfd_link_info *, asection *,
1546    bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1547 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1548   (bfd *, struct bfd_link_info *);
1549 extern bfd_vma _bfd_elf_eh_frame_section_offset
1550   (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1551 extern bfd_boolean _bfd_elf_write_section_eh_frame
1552   (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1553 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1554   (bfd *, struct bfd_link_info *);
1555 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1556   (struct bfd_link_info *);
1557
1558 extern bfd_boolean _bfd_elf_merge_symbol
1559   (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1560    asection **, bfd_vma *, unsigned int *,
1561    struct elf_link_hash_entry **, bfd_boolean *,
1562    bfd_boolean *, bfd_boolean *, bfd_boolean *);
1563
1564 extern bfd_boolean _bfd_elf_add_default_symbol
1565   (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
1566    const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
1567    bfd_boolean *, bfd_boolean);
1568
1569 extern bfd_boolean _bfd_elf_export_symbol
1570   (struct elf_link_hash_entry *, void *);
1571
1572 extern bfd_boolean _bfd_elf_link_find_version_dependencies
1573   (struct elf_link_hash_entry *, void *);
1574
1575 extern bfd_boolean _bfd_elf_link_assign_sym_version
1576   (struct elf_link_hash_entry *, void *);
1577
1578 extern long _bfd_elf_link_lookup_local_dynindx
1579   (struct bfd_link_info *, bfd *, long);
1580 extern bfd_boolean _bfd_elf_compute_section_file_positions
1581   (bfd *, struct bfd_link_info *);
1582 extern void _bfd_elf_assign_file_positions_for_relocs
1583   (bfd *);
1584 extern file_ptr _bfd_elf_assign_file_position_for_section
1585   (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1586
1587 extern bfd_boolean _bfd_elf_validate_reloc
1588   (bfd *, arelent *);
1589
1590 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1591   (bfd *, struct bfd_link_info *);
1592 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1593   (bfd *, struct bfd_link_info *, asection *);
1594 extern bfd_boolean _bfd_elf_create_dynamic_sections
1595   (bfd *, struct bfd_link_info *);
1596 extern bfd_boolean _bfd_elf_create_got_section
1597   (bfd *, struct bfd_link_info *);
1598
1599 extern bfd_boolean _bfd_elfcore_make_pseudosection
1600   (bfd *, char *, size_t, ufile_ptr);
1601 extern char *_bfd_elfcore_strndup
1602   (bfd *, char *, size_t);
1603
1604 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1605   (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1606
1607 extern bfd_boolean _bfd_elf_link_size_reloc_section
1608   (bfd *, Elf_Internal_Shdr *, asection *);
1609
1610 extern bfd_boolean _bfd_elf_link_output_relocs
1611   (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1612    struct elf_link_hash_entry **);
1613
1614 extern bfd_boolean _bfd_elf_fix_symbol_flags
1615   (struct elf_link_hash_entry *, struct elf_info_failed *);
1616
1617 extern bfd_boolean _bfd_elf_adjust_dynamic_symbol
1618   (struct elf_link_hash_entry *, void *);
1619
1620 extern bfd_boolean _bfd_elf_link_sec_merge_syms
1621   (struct elf_link_hash_entry *, void *);
1622
1623 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1624   (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1625
1626 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1627   (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1628
1629 extern bfd_boolean bfd_elf_match_symbols_in_sections
1630   (asection *sec1, asection *sec2);
1631
1632 extern bfd_boolean _bfd_elf_setup_group_pointers
1633   (bfd *);
1634
1635 extern const bfd_target *bfd_elf32_object_p
1636   (bfd *);
1637 extern const bfd_target *bfd_elf32_core_file_p
1638   (bfd *);
1639 extern char *bfd_elf32_core_file_failing_command
1640   (bfd *);
1641 extern int bfd_elf32_core_file_failing_signal
1642   (bfd *);
1643 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1644   (bfd *, bfd *);
1645
1646 extern void bfd_elf32_swap_symbol_in
1647   (bfd *, const void *, const void *, Elf_Internal_Sym *);
1648 extern void bfd_elf32_swap_symbol_out
1649   (bfd *, const Elf_Internal_Sym *, void *, void *);
1650 extern void bfd_elf32_swap_reloc_in
1651   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1652 extern void bfd_elf32_swap_reloc_out
1653   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1654 extern void bfd_elf32_swap_reloca_in
1655   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1656 extern void bfd_elf32_swap_reloca_out
1657   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1658 extern void bfd_elf32_swap_phdr_in
1659   (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
1660 extern void bfd_elf32_swap_phdr_out
1661   (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
1662 extern void bfd_elf32_swap_dyn_in
1663   (bfd *, const void *, Elf_Internal_Dyn *);
1664 extern void bfd_elf32_swap_dyn_out
1665   (bfd *, const Elf_Internal_Dyn *, void *);
1666 extern long bfd_elf32_slurp_symbol_table
1667   (bfd *, asymbol **, bfd_boolean);
1668 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
1669   (bfd *);
1670 extern int bfd_elf32_write_out_phdrs
1671   (bfd *, const Elf_Internal_Phdr *, unsigned int);
1672 extern void bfd_elf32_write_relocs
1673   (bfd *, asection *, void *);
1674 extern bfd_boolean bfd_elf32_slurp_reloc_table
1675   (bfd *, asection *, asymbol **, bfd_boolean);
1676
1677 extern const bfd_target *bfd_elf64_object_p
1678   (bfd *);
1679 extern const bfd_target *bfd_elf64_core_file_p
1680   (bfd *);
1681 extern char *bfd_elf64_core_file_failing_command
1682   (bfd *);
1683 extern int bfd_elf64_core_file_failing_signal
1684   (bfd *);
1685 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
1686   (bfd *, bfd *);
1687
1688 extern void bfd_elf64_swap_symbol_in
1689   (bfd *, const void *, const void *, Elf_Internal_Sym *);
1690 extern void bfd_elf64_swap_symbol_out
1691   (bfd *, const Elf_Internal_Sym *, void *, void *);
1692 extern void bfd_elf64_swap_reloc_in
1693   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1694 extern void bfd_elf64_swap_reloc_out
1695   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1696 extern void bfd_elf64_swap_reloca_in
1697   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1698 extern void bfd_elf64_swap_reloca_out
1699   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1700 extern void bfd_elf64_swap_phdr_in
1701   (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
1702 extern void bfd_elf64_swap_phdr_out
1703   (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
1704 extern void bfd_elf64_swap_dyn_in
1705   (bfd *, const void *, Elf_Internal_Dyn *);
1706 extern void bfd_elf64_swap_dyn_out
1707   (bfd *, const Elf_Internal_Dyn *, void *);
1708 extern long bfd_elf64_slurp_symbol_table
1709   (bfd *, asymbol **, bfd_boolean);
1710 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
1711   (bfd *);
1712 extern int bfd_elf64_write_out_phdrs
1713   (bfd *, const Elf_Internal_Phdr *, unsigned int);
1714 extern void bfd_elf64_write_relocs
1715   (bfd *, asection *, void *);
1716 extern bfd_boolean bfd_elf64_slurp_reloc_table
1717   (bfd *, asection *, asymbol **, bfd_boolean);
1718
1719 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
1720   (bfd *, struct bfd_link_info *, const char *);
1721 extern bfd_boolean bfd_elf_link_add_symbols
1722   (bfd *, struct bfd_link_info *);
1723 extern bfd_boolean _bfd_elf_add_dynamic_entry
1724   (struct bfd_link_info *, bfd_vma, bfd_vma);
1725
1726 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
1727   (struct bfd_link_info *, struct elf_link_hash_entry *);
1728
1729 extern int bfd_elf_link_record_local_dynamic_symbol
1730   (struct bfd_link_info *, bfd *, long);
1731
1732 extern bfd_boolean _bfd_elf_close_and_cleanup
1733   (bfd *);
1734
1735 extern void _bfd_dwarf2_cleanup_debug_info
1736   (bfd *);
1737
1738 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
1739   (bfd *, arelent *, struct bfd_symbol *, void *,
1740    asection *, bfd *, char **);
1741
1742 extern bfd_boolean bfd_elf_final_link
1743   (bfd *, struct bfd_link_info *);
1744
1745 extern bfd_boolean bfd_elf_gc_sections
1746   (bfd *, struct bfd_link_info *);
1747
1748 extern bfd_boolean bfd_elf_gc_record_vtinherit
1749   (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
1750
1751 extern bfd_boolean bfd_elf_gc_record_vtentry
1752   (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
1753
1754 extern bfd_boolean _bfd_elf_gc_mark
1755   (struct bfd_link_info *, asection *,
1756    asection * (*) (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
1757                    struct elf_link_hash_entry *, Elf_Internal_Sym *));
1758
1759 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
1760   (bfd *, struct bfd_link_info *);
1761
1762 extern bfd_boolean bfd_elf_gc_common_final_link
1763   (bfd *, struct bfd_link_info *);
1764
1765 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
1766   (bfd_vma, void *);
1767
1768 extern struct elf_segment_map *
1769 _bfd_elf_make_dynamic_segment
1770   (bfd *, asection *);
1771
1772 /* Exported interface for writing elf corefile notes. */
1773 extern char *elfcore_write_note
1774   (bfd *, char *, int *, const char *, int, const void *, int);
1775 extern char *elfcore_write_prpsinfo
1776   (bfd *, char *, int *, const char *, const char *);
1777 extern char *elfcore_write_prstatus
1778   (bfd *, char *, int *, long, int, const void *);
1779 extern char * elfcore_write_pstatus
1780   (bfd *, char *, int *, long, int, const void *);
1781 extern char *elfcore_write_prfpreg
1782   (bfd *, char *, int *, const void *, int);
1783 extern char *elfcore_write_prxfpreg
1784   (bfd *, char *, int *, const void *, int);
1785 extern char *elfcore_write_lwpstatus
1786   (bfd *, char *, int *, long, int, const void *);
1787
1788 extern bfd *_bfd_elf32_bfd_from_remote_memory
1789   (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1790    int (*target_read_memory) (bfd_vma, bfd_byte *, int));
1791 extern bfd *_bfd_elf64_bfd_from_remote_memory
1792   (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1793    int (*target_read_memory) (bfd_vma, bfd_byte *, int));
1794
1795 /* SH ELF specific routine.  */
1796
1797 extern bfd_boolean _sh_elf_set_mach_from_flags
1798   (bfd *);
1799
1800 /* This is the condition under which finish_dynamic_symbol will be called.
1801    If our finish_dynamic_symbol isn't called, we'll need to do something
1802    about initializing any .plt and .got entries in relocate_section.  */
1803 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1804   ((DYN)                                                                \
1805    && ((SHARED) || !(H)->forced_local)                                  \
1806    && ((H)->dynindx != -1 || (H)->forced_local))
1807
1808 /* This macro is to avoid lots of duplicated code in the body
1809    of xxx_relocate_section() in the various elfxx-xxxx.c files.  */
1810 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel,    \
1811                                 r_symndx, symtab_hdr, sym_hashes,       \
1812                                 h, sec, relocation,                     \
1813                                 unresolved_reloc, warned)               \
1814   do                                                                    \
1815     {                                                                   \
1816       /* It seems this can happen with erroneous or unsupported         \
1817          input (mixing a.out and elf in an archive, for example.)  */   \
1818       if (sym_hashes == NULL)                                           \
1819         return FALSE;                                                   \
1820                                                                         \
1821       h = sym_hashes[r_symndx - symtab_hdr->sh_info];                   \
1822                                                                         \
1823       while (h->root.type == bfd_link_hash_indirect                     \
1824              || h->root.type == bfd_link_hash_warning)                  \
1825         h = (struct elf_link_hash_entry *) h->root.u.i.link;            \
1826                                                                         \
1827       warned = FALSE;                                                   \
1828       unresolved_reloc = FALSE;                                         \
1829       relocation = 0;                                                   \
1830       if (h->root.type == bfd_link_hash_defined                         \
1831           || h->root.type == bfd_link_hash_defweak)                     \
1832         {                                                               \
1833           sec = h->root.u.def.section;                                  \
1834           if (sec == NULL                                               \
1835               || sec->output_section == NULL)                           \
1836             /* Set a flag that will be cleared later if we find a       \
1837                relocation value for this symbol.  output_section        \
1838                is typically NULL for symbols satisfied by a shared      \
1839                library.  */                                             \
1840             unresolved_reloc = TRUE;                                    \
1841           else                                                          \
1842             relocation = (h->root.u.def.value                           \
1843                           + sec->output_section->vma                    \
1844                           + sec->output_offset);                        \
1845         }                                                               \
1846       else if (h->root.type == bfd_link_hash_undefweak)                 \
1847         ;                                                               \
1848       else if (info->unresolved_syms_in_objects == RM_IGNORE            \
1849                && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)          \
1850         ;                                                               \
1851       else                                                              \
1852         {                                                               \
1853           bfd_boolean err;                                              \
1854           err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR  \
1855                  || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT);       \
1856           if (!info->callbacks->undefined_symbol (info,                 \
1857                                                   h->root.root.string,  \
1858                                                   input_bfd,            \
1859                                                   input_section,        \
1860                                                   rel->r_offset, err))  \
1861             return FALSE;                                               \
1862           warned = TRUE;                                                \
1863         }                                                               \
1864     }                                                                   \
1865   while (0)
1866
1867 #endif /* _LIBELF_H_ */