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, 2006 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   /* The _PROCEDURE_LINKAGE_TABLE_ symbol.  */
 382   struct elf_link_hash_entry *hplt;
 383
 384   /* A pointer to information used to merge SEC_MERGE sections.  */
 385   void *merge_info;
 386
 387   /* Used to link stabs in sections.  */
 388   struct stab_info stab_info;
 389
 390   /* Used by eh_frame code when editing .eh_frame.  */
 391   struct eh_frame_hdr_info eh_info;
 392
 393   /* A linked list of local symbols to be added to .dynsym.  */
 394   struct elf_link_local_dynamic_entry *dynlocal;
 395
 396   /* A linked list of DT_RPATH/DT_RUNPATH names found in dynamic
 397      objects included in the link.  */
 398   struct bfd_link_needed_list *runpath;
 399
 400   /* Cached first output tls section and size of PT_TLS segment.  */
 401   asection *tls_sec;
 402   bfd_size_type tls_size;
 403
 404   /* A linked list of BFD's loaded in the link.  */
 405   struct elf_link_loaded_list *loaded;
 406
 407   /* True if this target has relocatable executables, so needs dynamic
 408      section symbols.  */
 409   bfd_boolean is_relocatable_executable;
 410 };
 411
 412 /* Look up an entry in an ELF linker hash table.  */
 413
 414 #define elf_link_hash_lookup(table, string, create, copy, follow)       \
 415   ((struct elf_link_hash_entry *)                                       \
 416    bfd_link_hash_lookup (&(table)->root, (string), (create),            \
 417                          (copy), (follow)))
 418
 419 /* Traverse an ELF linker hash table.  */
 420
 421 #define elf_link_hash_traverse(table, func, info)                       \
 422   (bfd_link_hash_traverse                                               \
 423    (&(table)->root,                                                     \
 424     (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func),    \
 425     (info)))
 426
 427 /* Get the ELF linker hash table from a link_info structure.  */
 428
 429 #define elf_hash_table(p) ((struct elf_link_hash_table *) ((p)->hash))
 430
 431 /* Returns TRUE if the hash table is a struct elf_link_hash_table.  */
 432 #define is_elf_hash_table(htab)                                         \
 433   (((struct bfd_link_hash_table *) (htab))->type == bfd_link_elf_hash_table)
 434
 435 /* Used by bfd_section_from_r_symndx to cache a small number of local
 436    symbol to section mappings.  */
 437 #define LOCAL_SYM_CACHE_SIZE 32
 438 struct sym_sec_cache
 439 {
 440   bfd *abfd;
 441   unsigned long indx[LOCAL_SYM_CACHE_SIZE];
 442   asection *sec[LOCAL_SYM_CACHE_SIZE];
 443 };
 444 \f
 445 /* Constant information held for an ELF backend.  */
 446
 447 struct elf_size_info {
 448   unsigned char sizeof_ehdr, sizeof_phdr, sizeof_shdr;
 449   unsigned char sizeof_rel, sizeof_rela, sizeof_sym, sizeof_dyn, sizeof_note;
 450
 451   /* The size of entries in the .hash section.  */
 452   unsigned char sizeof_hash_entry;
 453
 454   /* The number of internal relocations to allocate per external
 455      relocation entry.  */
 456   unsigned char int_rels_per_ext_rel;
 457   /* We use some fixed size arrays.  This should be large enough to
 458      handle all back-ends.  */
 459 #define MAX_INT_RELS_PER_EXT_REL 3
 460
 461   unsigned char arch_size, log_file_align;
 462   unsigned char elfclass, ev_current;
 463   int (*write_out_phdrs)
 464     (bfd *, const Elf_Internal_Phdr *, unsigned int);
 465   bfd_boolean
 466     (*write_shdrs_and_ehdr) (bfd *);
 467   void (*write_relocs)
 468     (bfd *, asection *, void *);
 469   void (*swap_symbol_in)
 470     (bfd *, const void *, const void *, Elf_Internal_Sym *);
 471   void (*swap_symbol_out)
 472     (bfd *, const Elf_Internal_Sym *, void *, void *);
 473   bfd_boolean (*slurp_reloc_table)
 474     (bfd *, asection *, asymbol **, bfd_boolean);
 475   long (*slurp_symbol_table)
 476     (bfd *, asymbol **, bfd_boolean);
 477   void (*swap_dyn_in)
 478     (bfd *, const void *, Elf_Internal_Dyn *);
 479   void (*swap_dyn_out)
 480     (bfd *, const Elf_Internal_Dyn *, void *);
 481
 482   /* This function is called to swap in a REL relocation.  If an
 483      external relocation corresponds to more than one internal
 484      relocation, then all relocations are swapped in at once.  */
 485   void (*swap_reloc_in)
 486     (bfd *, const bfd_byte *, Elf_Internal_Rela *);
 487
 488   /* This function is called to swap out a REL relocation.  */
 489   void (*swap_reloc_out)
 490     (bfd *, const Elf_Internal_Rela *, bfd_byte *);
 491
 492   /* This function is called to swap in a RELA relocation.  If an
 493      external relocation corresponds to more than one internal
 494      relocation, then all relocations are swapped in at once.  */
 495   void (*swap_reloca_in)
 496     (bfd *, const bfd_byte *, Elf_Internal_Rela *);
 497
 498   /* This function is called to swap out a RELA relocation.  */
 499   void (*swap_reloca_out)
 500     (bfd *, const Elf_Internal_Rela *, bfd_byte *);
 501 };
 502
 503 #define elf_symbol_from(ABFD,S) \
 504         (((S)->the_bfd->xvec->flavour == bfd_target_elf_flavour \
 505           && (S)->the_bfd->tdata.elf_obj_data != 0) \
 506          ? (elf_symbol_type *) (S) \
 507          : 0)
 508
 509 enum elf_reloc_type_class {
 510   reloc_class_normal,
 511   reloc_class_relative,
 512   reloc_class_plt,
 513   reloc_class_copy
 514 };
 515
 516 struct elf_reloc_cookie
 517 {
 518   Elf_Internal_Rela *rels, *rel, *relend;
 519   Elf_Internal_Sym *locsyms;
 520   bfd *abfd;
 521   size_t locsymcount;
 522   size_t extsymoff;
 523   struct elf_link_hash_entry **sym_hashes;
 524   int r_sym_shift;
 525   bfd_boolean bad_symtab;
 526 };
 527
 528 /* The level of IRIX compatibility we're striving for.  */
 529
 530 typedef enum {
 531   ict_none,
 532   ict_irix5,
 533   ict_irix6
 534 } irix_compat_t;
 535
 536 /* Mapping of ELF section names and types.  */
 537 struct bfd_elf_special_section
 538 {
 539   const char *prefix;
 540   int prefix_length;
 541   /* 0 means name must match PREFIX exactly.
 542      -1 means name must start with PREFIX followed by an arbitrary string.
 543      -2 means name must match PREFIX exactly or consist of PREFIX followed
 544      by a dot then anything.
 545      > 0 means name must start with the first PREFIX_LENGTH chars of
 546      PREFIX and finish with the last SUFFIX_LENGTH chars of PREFIX.  */
 547   int suffix_length;
 548   int type;
 549   int attr;
 550 };
 551
 552 enum action_discarded
 553   {
 554     COMPLAIN = 1,
 555     PRETEND = 2
 556   };
 557
 558 struct elf_backend_data
 559 {
 560   /* The architecture for this backend.  */
 561   enum bfd_architecture arch;
 562
 563   /* The ELF machine code (EM_xxxx) for this backend.  */
 564   int elf_machine_code;
 565
 566   /* The maximum page size for this backend.  */
 567   bfd_vma maxpagesize;
 568
 569   /* The minimum page size for this backend.  An input object will not be
 570      considered page aligned unless its sections are correctly aligned for
 571      pages at least this large.  May be smaller than maxpagesize.  */
 572   bfd_vma minpagesize;
 573
 574   /* The BFD flags applied to sections created for dynamic linking.  */
 575   flagword dynamic_sec_flags;
 576
 577   /* A function to translate an ELF RELA relocation to a BFD arelent
 578      structure.  */
 579   void (*elf_info_to_howto)
 580     (bfd *, arelent *, Elf_Internal_Rela *);
 581
 582   /* A function to translate an ELF REL relocation to a BFD arelent
 583      structure.  */
 584   void (*elf_info_to_howto_rel)
 585     (bfd *, arelent *, Elf_Internal_Rela *);
 586
 587   /* A function to determine whether a symbol is global when
 588      partitioning the symbol table into local and global symbols.
 589      This should be NULL for most targets, in which case the correct
 590      thing will be done.  MIPS ELF, at least on the Irix 5, has
 591      special requirements.  */
 592   bfd_boolean (*elf_backend_sym_is_global)
 593     (bfd *, asymbol *);
 594
 595   /* The remaining functions are hooks which are called only if they
 596      are not NULL.  */
 597
 598   /* A function to permit a backend specific check on whether a
 599      particular BFD format is relevant for an object file, and to
 600      permit the backend to set any global information it wishes.  When
 601      this is called elf_elfheader is set, but anything else should be
 602      used with caution.  If this returns FALSE, the check_format
 603      routine will return a bfd_error_wrong_format error.  */
 604   bfd_boolean (*elf_backend_object_p)
 605     (bfd *);
 606
 607   /* A function to do additional symbol processing when reading the
 608      ELF symbol table.  This is where any processor-specific special
 609      section indices are handled.  */
 610   void (*elf_backend_symbol_processing)
 611     (bfd *, asymbol *);
 612
 613   /* A function to do additional symbol processing after reading the
 614      entire ELF symbol table.  */
 615   bfd_boolean (*elf_backend_symbol_table_processing)
 616     (bfd *, elf_symbol_type *, unsigned int);
 617
 618   /* A function to set the type of the info field.  Processor-specific
 619      types should be handled here.  */
 620   int (*elf_backend_get_symbol_type)
 621     (Elf_Internal_Sym *, int);
 622
 623   /* A function to return the linker hash table entry of a symbol that
 624      might be satisfied by an archive symbol.  */
 625   struct elf_link_hash_entry * (*elf_backend_archive_symbol_lookup)
 626     (bfd *, struct bfd_link_info *, const char *);
 627
 628   /* Return true if local section symbols should have a non-null st_name.
 629      NULL implies false.  */
 630   bfd_boolean (*elf_backend_name_local_section_symbols)
 631     (bfd *);
 632
 633   /* A function to do additional processing on the ELF section header
 634      just before writing it out.  This is used to set the flags and
 635      type fields for some sections, or to actually write out data for
 636      unusual sections.  */
 637   bfd_boolean (*elf_backend_section_processing)
 638     (bfd *, Elf_Internal_Shdr *);
 639
 640   /* A function to handle unusual section types when creating BFD
 641      sections from ELF sections.  */
 642   bfd_boolean (*elf_backend_section_from_shdr)
 643     (bfd *, Elf_Internal_Shdr *, const char *, int);
 644
 645   /* A function to convert machine dependent ELF section header flags to
 646      BFD internal section header flags.  */
 647   bfd_boolean (*elf_backend_section_flags)
 648     (flagword *, const Elf_Internal_Shdr *);
 649
 650   /* A function that returns a struct containing ELF section flags and
 651      type for the given BFD section.   */
 652   const struct bfd_elf_special_section * (*get_sec_type_attr)
 653     (bfd *, asection *);
 654
 655   /* A function to handle unusual program segment types when creating BFD
 656      sections from ELF program segments.  */
 657   bfd_boolean (*elf_backend_section_from_phdr)
 658     (bfd *, Elf_Internal_Phdr *, int, const char *);
 659
 660   /* A function to set up the ELF section header for a BFD section in
 661      preparation for writing it out.  This is where the flags and type
 662      fields are set for unusual sections.  */
 663   bfd_boolean (*elf_backend_fake_sections)
 664     (bfd *, Elf_Internal_Shdr *, asection *);
 665
 666   /* A function to get the ELF section index for a BFD section.  If
 667      this returns TRUE, the section was found.  If it is a normal ELF
 668      section, *RETVAL should be left unchanged.  If it is not a normal
 669      ELF section *RETVAL should be set to the SHN_xxxx index.  */
 670   bfd_boolean (*elf_backend_section_from_bfd_section)
 671     (bfd *, asection *, int *retval);
 672
 673   /* If this field is not NULL, it is called by the add_symbols phase
 674      of a link just before adding a symbol to the global linker hash
 675      table.  It may modify any of the fields as it wishes.  If *NAME
 676      is set to NULL, the symbol will be skipped rather than being
 677      added to the hash table.  This function is responsible for
 678      handling all processor dependent symbol bindings and section
 679      indices, and must set at least *FLAGS and *SEC for each processor
 680      dependent case; failure to do so will cause a link error.  */
 681   bfd_boolean (*elf_add_symbol_hook)
 682     (bfd *abfd, struct bfd_link_info *info, Elf_Internal_Sym *,
 683      const char **name, flagword *flags, asection **sec, bfd_vma *value);
 684
 685   /* If this field is not NULL, it is called by the elf_link_output_sym
 686      phase of a link for each symbol which will appear in the object file.  */
 687   bfd_boolean (*elf_backend_link_output_symbol_hook)
 688     (struct bfd_link_info *info, const char *, Elf_Internal_Sym *,
 689      asection *, struct elf_link_hash_entry *);
 690
 691   /* The CREATE_DYNAMIC_SECTIONS function is called by the ELF backend
 692      linker the first time it encounters a dynamic object in the link.
 693      This function must create any sections required for dynamic
 694      linking.  The ABFD argument is a dynamic object.  The .interp,
 695      .dynamic, .dynsym, .dynstr, and .hash functions have already been
 696      created, and this function may modify the section flags if
 697      desired.  This function will normally create the .got and .plt
 698      sections, but different backends have different requirements.  */
 699   bfd_boolean (*elf_backend_create_dynamic_sections)
 700     (bfd *abfd, struct bfd_link_info *info);
 701
 702   /* When creating a shared library, determine whether to omit the
 703      dynamic symbol for the section.  */
 704   bfd_boolean (*elf_backend_omit_section_dynsym)
 705     (bfd *output_bfd, struct bfd_link_info *info, asection *osec);
 706
 707   /* The CHECK_RELOCS function is called by the add_symbols phase of
 708      the ELF backend linker.  It is called once for each section with
 709      relocs of an object file, just after the symbols for the object
 710      file have been added to the global linker hash table.  The
 711      function must look through the relocs and do any special handling
 712      required.  This generally means allocating space in the global
 713      offset table, and perhaps allocating space for a reloc.  The
 714      relocs are always passed as Rela structures; if the section
 715      actually uses Rel structures, the r_addend field will always be
 716      zero.  */
 717   bfd_boolean (*check_relocs)
 718     (bfd *abfd, struct bfd_link_info *info, asection *o,
 719      const Elf_Internal_Rela *relocs);
 720
 721   /* The CHECK_DIRECTIVES function is called once per input file by
 722      the add_symbols phase of the ELF backend linker.  The function
 723      must inspect the bfd and create any additional symbols according
 724      to any custom directives in the bfd.  */
 725   bfd_boolean (*check_directives)
 726     (bfd *abfd, struct bfd_link_info *info);
 727
 728   /* The ADJUST_DYNAMIC_SYMBOL function is called by the ELF backend
 729      linker for every symbol which is defined by a dynamic object and
 730      referenced by a regular object.  This is called after all the
 731      input files have been seen, but before the SIZE_DYNAMIC_SECTIONS
 732      function has been called.  The hash table entry should be
 733      bfd_link_hash_defined ore bfd_link_hash_defweak, and it should be
 734      defined in a section from a dynamic object.  Dynamic object
 735      sections are not included in the final link, and this function is
 736      responsible for changing the value to something which the rest of
 737      the link can deal with.  This will normally involve adding an
 738      entry to the .plt or .got or some such section, and setting the
 739      symbol to point to that.  */
 740   bfd_boolean (*elf_backend_adjust_dynamic_symbol)
 741     (struct bfd_link_info *info, struct elf_link_hash_entry *h);
 742
 743   /* The ALWAYS_SIZE_SECTIONS function is called by the backend linker
 744      after all the linker input files have been seen but before the
 745      section sizes have been set.  This is called after
 746      ADJUST_DYNAMIC_SYMBOL, but before SIZE_DYNAMIC_SECTIONS.  */
 747   bfd_boolean (*elf_backend_always_size_sections)
 748     (bfd *output_bfd, struct bfd_link_info *info);
 749
 750   /* The SIZE_DYNAMIC_SECTIONS function is called by the ELF backend
 751      linker after all the linker input files have been seen but before
 752      the sections sizes have been set.  This is called after
 753      ADJUST_DYNAMIC_SYMBOL has been called on all appropriate symbols.
 754      It is only called when linking against a dynamic object.  It must
 755      set the sizes of the dynamic sections, and may fill in their
 756      contents as well.  The generic ELF linker can handle the .dynsym,
 757      .dynstr and .hash sections.  This function must handle the
 758      .interp section and any sections created by the
 759      CREATE_DYNAMIC_SECTIONS entry point.  */
 760   bfd_boolean (*elf_backend_size_dynamic_sections)
 761     (bfd *output_bfd, struct bfd_link_info *info);
 762
 763   /* The RELOCATE_SECTION function is called by the ELF backend linker
 764      to handle the relocations for a section.
 765
 766      The relocs are always passed as Rela structures; if the section
 767      actually uses Rel structures, the r_addend field will always be
 768      zero.
 769
 770      This function is responsible for adjust the section contents as
 771      necessary, and (if using Rela relocs and generating a
 772      relocatable output file) adjusting the reloc addend as
 773      necessary.
 774
 775      This function does not have to worry about setting the reloc
 776      address or the reloc symbol index.
 777
 778      LOCAL_SYMS is a pointer to the swapped in local symbols.
 779
 780      LOCAL_SECTIONS is an array giving the section in the input file
 781      corresponding to the st_shndx field of each local symbol.
 782
 783      The global hash table entry for the global symbols can be found
 784      via elf_sym_hashes (input_bfd).
 785
 786      When generating relocatable output, this function must handle
 787      STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
 788      going to be the section symbol corresponding to the output
 789      section, which means that the addend must be adjusted
 790      accordingly.  */
 791   bfd_boolean (*elf_backend_relocate_section)
 792     (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd,
 793      asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs,
 794      Elf_Internal_Sym *local_syms, asection **local_sections);
 795
 796   /* The FINISH_DYNAMIC_SYMBOL function is called by the ELF backend
 797      linker just before it writes a symbol out to the .dynsym section.
 798      The processor backend may make any required adjustment to the
 799      symbol.  It may also take the opportunity to set contents of the
 800      dynamic sections.  Note that FINISH_DYNAMIC_SYMBOL is called on
 801      all .dynsym symbols, while ADJUST_DYNAMIC_SYMBOL is only called
 802      on those symbols which are defined by a dynamic object.  */
 803   bfd_boolean (*elf_backend_finish_dynamic_symbol)
 804     (bfd *output_bfd, struct bfd_link_info *info,
 805      struct elf_link_hash_entry *h, Elf_Internal_Sym *sym);
 806
 807   /* The FINISH_DYNAMIC_SECTIONS function is called by the ELF backend
 808      linker just before it writes all the dynamic sections out to the
 809      output file.  The FINISH_DYNAMIC_SYMBOL will have been called on
 810      all dynamic symbols.  */
 811   bfd_boolean (*elf_backend_finish_dynamic_sections)
 812     (bfd *output_bfd, struct bfd_link_info *info);
 813
 814   /* A function to do any beginning processing needed for the ELF file
 815      before building the ELF headers and computing file positions.  */
 816   void (*elf_backend_begin_write_processing)
 817     (bfd *, struct bfd_link_info *);
 818
 819   /* A function to do any final processing needed for the ELF file
 820      before writing it out.  The LINKER argument is TRUE if this BFD
 821      was created by the ELF backend linker.  */
 822   void (*elf_backend_final_write_processing)
 823     (bfd *, bfd_boolean linker);
 824
 825   /* This function is called by get_program_header_size.  It should
 826      return the number of additional program segments which this BFD
 827      will need.  It should return -1 on error.  */
 828   int (*elf_backend_additional_program_headers)
 829     (bfd *);
 830
 831   /* This function is called to modify an existing segment map in a
 832      backend specific fashion.  */
 833   bfd_boolean (*elf_backend_modify_segment_map)
 834     (bfd *, struct bfd_link_info *);
 835
 836   /* This function is called during section garbage collection to
 837      mark sections that define global symbols.  */
 838   bfd_boolean (*gc_mark_dynamic_ref)
 839     (struct elf_link_hash_entry *h, void *inf);
 840
 841   /* This function is called during section gc to discover the section a
 842      particular relocation refers to.  */
 843   asection * (*gc_mark_hook)
 844     (asection *sec, struct bfd_link_info *, Elf_Internal_Rela *,
 845      struct elf_link_hash_entry *h, Elf_Internal_Sym *);
 846
 847   /* This function, if defined, is called during the sweep phase of gc
 848      in order that a backend might update any data structures it might
 849      be maintaining.  */
 850   bfd_boolean (*gc_sweep_hook)
 851     (bfd *abfd, struct bfd_link_info *info, asection *o,
 852      const Elf_Internal_Rela *relocs);
 853
 854   /* This function, if defined, is called after the ELF headers have
 855      been created.  This allows for things like the OS and ABI versions
 856      to be changed.  */
 857   void (*elf_backend_post_process_headers)
 858     (bfd *, struct bfd_link_info *);
 859
 860   /* This function, if defined, prints a symbol to file and returns the
 861      name of the symbol to be printed.  It should return NULL to fall
 862      back to default symbol printing.  */
 863   const char *(*elf_backend_print_symbol_all)
 864     (bfd *, void *, asymbol *);
 865
 866   /* This function, if defined, is called after all local symbols and
 867      global symbols converted to locals are emitted into the symtab
 868      section.  It allows the backend to emit special global symbols
 869      not handled in the hash table.  */
 870   bfd_boolean (*elf_backend_output_arch_syms)
 871     (bfd *, struct bfd_link_info *, void *,
 872      bfd_boolean (*) (void *, const char *, Elf_Internal_Sym *, asection *,
 873                       struct elf_link_hash_entry *));
 874
 875   /* Copy any information related to dynamic linking from a pre-existing
 876      symbol to a newly created symbol.  Also called to copy flags and
 877      other back-end info to a weakdef, in which case the symbol is not
 878      newly created and plt/got refcounts and dynamic indices should not
 879      be copied.  */
 880   void (*elf_backend_copy_indirect_symbol)
 881     (struct bfd_link_info *, struct elf_link_hash_entry *,
 882      struct elf_link_hash_entry *);
 883
 884   /* Modify any information related to dynamic linking such that the
 885      symbol is not exported.  */
 886   void (*elf_backend_hide_symbol)
 887     (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
 888
 889   /* A function to do additional symbol fixup, called by
 890      _bfd_elf_fix_symbol_flags.  */
 891   bfd_boolean (*elf_backend_fixup_symbol)
 892     (struct bfd_link_info *, struct elf_link_hash_entry *);
 893
 894   /* Merge the backend specific symbol attribute.  */
 895   void (*elf_backend_merge_symbol_attribute)
 896     (struct elf_link_hash_entry *, const Elf_Internal_Sym *, bfd_boolean,
 897      bfd_boolean);
 898
 899   /* Decide whether an undefined symbol is special and can be ignored.
 900      This is the case for OPTIONAL symbols on IRIX.  */
 901   bfd_boolean (*elf_backend_ignore_undef_symbol)
 902     (struct elf_link_hash_entry *);
 903
 904   /* Emit relocations.  Overrides default routine for emitting relocs,
 905      except during a relocatable link, or if all relocs are being emitted.  */
 906   bfd_boolean (*elf_backend_emit_relocs)
 907     (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
 908      struct elf_link_hash_entry **);
 909
 910   /* Count relocations.  Not called for relocatable links
 911      or if all relocs are being preserved in the output.  */
 912   unsigned int (*elf_backend_count_relocs)
 913     (asection *, Elf_Internal_Rela *);
 914
 915   /* This function, if defined, is called when an NT_PRSTATUS note is found
 916      in a core file. */
 917   bfd_boolean (*elf_backend_grok_prstatus)
 918     (bfd *, Elf_Internal_Note *);
 919
 920   /* This function, if defined, is called when an NT_PSINFO or NT_PRPSINFO
 921      note is found in a core file. */
 922   bfd_boolean (*elf_backend_grok_psinfo)
 923     (bfd *, Elf_Internal_Note *);
 924
 925   /* Functions to print VMAs.  Special code to handle 64 bit ELF files.  */
 926   void (* elf_backend_sprintf_vma)
 927     (bfd *, char *, bfd_vma);
 928   void (* elf_backend_fprintf_vma)
 929     (bfd *, void *, bfd_vma);
 930
 931   /* This function returns class of a reloc type.  */
 932   enum elf_reloc_type_class (*elf_backend_reloc_type_class)
 933     (const Elf_Internal_Rela *);
 934
 935   /* This function, if defined, removes information about discarded functions
 936      from other sections which mention them.  */
 937   bfd_boolean (*elf_backend_discard_info)
 938     (bfd *, struct elf_reloc_cookie *, struct bfd_link_info *);
 939
 940   /* This function, if defined, signals that the function above has removed
 941      the discarded relocations for this section.  */
 942   bfd_boolean (*elf_backend_ignore_discarded_relocs)
 943     (asection *);
 944
 945   /* What to do when ld finds relocations against symbols defined in
 946      discarded sections.  */
 947   unsigned int (*action_discarded)
 948     (asection *);
 949
 950   /* This function returns the width of FDE pointers in bytes, or 0 if
 951      that can't be determined for some reason.  The default definition
 952      goes by the bfd's EI_CLASS.  */
 953   unsigned int (*elf_backend_eh_frame_address_size)
 954     (bfd *, asection *);
 955
 956   /* These functions tell elf-eh-frame whether to attempt to turn
 957      absolute or lsda encodings into pc-relative ones.  The default
 958      definition enables these transformations.  */
 959   bfd_boolean (*elf_backend_can_make_relative_eh_frame)
 960      (bfd *, struct bfd_link_info *, asection *);
 961   bfd_boolean (*elf_backend_can_make_lsda_relative_eh_frame)
 962      (bfd *, struct bfd_link_info *, asection *);
 963
 964   /* This function returns an encoding after computing the encoded
 965      value (and storing it in ENCODED) for the given OFFSET into OSEC,
 966      to be stored in at LOC_OFFSET into the LOC_SEC input section.
 967      The default definition chooses a 32-bit PC-relative encoding.  */
 968   bfd_byte (*elf_backend_encode_eh_address)
 969      (bfd *abfd, struct bfd_link_info *info,
 970       asection *osec, bfd_vma offset,
 971       asection *loc_sec, bfd_vma loc_offset,
 972       bfd_vma *encoded);
 973
 974   /* This function, if defined, may write out the given section.
 975      Returns TRUE if it did so and FALSE if the caller should.  */
 976   bfd_boolean (*elf_backend_write_section)
 977     (bfd *, asection *, bfd_byte *);
 978
 979   /* The level of IRIX compatibility we're striving for.
 980      MIPS ELF specific function.  */
 981   irix_compat_t (*elf_backend_mips_irix_compat)
 982     (bfd *);
 983
 984   reloc_howto_type *(*elf_backend_mips_rtype_to_howto)
 985     (unsigned int, bfd_boolean);
 986
 987   /* The swapping table to use when dealing with ECOFF information.
 988      Used for the MIPS ELF .mdebug section.  */
 989   const struct ecoff_debug_swap *elf_backend_ecoff_debug_swap;
 990
 991   /* This function implements `bfd_elf_bfd_from_remote_memory';
 992      see elf.c, elfcode.h.  */
 993   bfd *(*elf_backend_bfd_from_remote_memory)
 994      (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
 995       int (*target_read_memory) (bfd_vma vma, bfd_byte *myaddr, int len));
 996
 997   /* This function is used by `_bfd_elf_get_synthetic_symtab';
 998      see elf.c.  */
 999   bfd_vma (*plt_sym_val) (bfd_vma, const asection *, const arelent *);
1000
1001   /* Is symbol defined in common section?  */
1002   bfd_boolean (*common_definition) (Elf_Internal_Sym *);
1003
1004   /* Return a common section index for section.  */
1005   unsigned int (*common_section_index) (asection *);
1006
1007   /* Return a common section for section.  */
1008   asection *(*common_section) (asection *);
1009
1010   /* Return TRUE if we can merge 2 definitions.  */
1011   bfd_boolean (*merge_symbol) (struct bfd_link_info *,
1012                                struct elf_link_hash_entry **,
1013                                struct elf_link_hash_entry *,
1014                                Elf_Internal_Sym *, asection **,
1015                                bfd_vma *, unsigned int *,
1016                                bfd_boolean *, bfd_boolean *,
1017                                bfd_boolean *, bfd_boolean *,
1018                                bfd_boolean *, bfd_boolean *,
1019                                bfd_boolean *, bfd_boolean *,
1020                                bfd *, asection **,
1021                                bfd_boolean *, bfd_boolean *,
1022                                bfd_boolean *, bfd_boolean *,
1023                                bfd *, asection **);
1024
1025   /* Used to handle bad SHF_LINK_ORDER input.  */
1026   bfd_error_handler_type link_order_error_handler;
1027
1028   /* Name of the PLT relocation section.  */
1029   const char *relplt_name;
1030
1031   /* Alternate EM_xxxx machine codes for this backend.  */
1032   int elf_machine_alt1;
1033   int elf_machine_alt2;
1034
1035   const struct elf_size_info *s;
1036
1037   /* An array of target specific special sections.  */
1038   const struct bfd_elf_special_section *special_sections;
1039
1040   /* The size in bytes of the header for the GOT.  This includes the
1041      so-called reserved entries on some systems.  */
1042   bfd_vma got_header_size;
1043
1044   /* This is TRUE if the linker should act like collect and gather
1045      global constructors and destructors by name.  This is TRUE for
1046      MIPS ELF because the Irix 5 tools can not handle the .init
1047      section.  */
1048   unsigned collect : 1;
1049
1050   /* This is TRUE if the linker should ignore changes to the type of a
1051      symbol.  This is TRUE for MIPS ELF because some Irix 5 objects
1052      record undefined functions as STT_OBJECT although the definitions
1053      are STT_FUNC.  */
1054   unsigned type_change_ok : 1;
1055
1056   /* Whether the backend may use REL relocations.  (Some backends use
1057      both REL and RELA relocations, and this flag is set for those
1058      backends.)  */
1059   unsigned may_use_rel_p : 1;
1060
1061   /* Whether the backend may use RELA relocations.  (Some backends use
1062      both REL and RELA relocations, and this flag is set for those
1063      backends.)  */
1064   unsigned may_use_rela_p : 1;
1065
1066   /* Whether the default relocation type is RELA.  If a backend with
1067      this flag set wants REL relocations for a particular section,
1068      it must note that explicitly.  Similarly, if this flag is clear,
1069      and the backend wants RELA relocations for a particular
1070      section.  */
1071   unsigned default_use_rela_p : 1;
1072
1073   /* Set if RELA relocations for a relocatable link can be handled by
1074      generic code.  Backends that set this flag need do nothing in the
1075      backend relocate_section routine for relocatable linking.  */
1076   unsigned rela_normal : 1;
1077
1078   /* TRUE if addresses "naturally" sign extend.  This is used when
1079      swapping in from Elf32 when BFD64.  */
1080   unsigned sign_extend_vma : 1;
1081
1082   unsigned want_got_plt : 1;
1083   unsigned plt_readonly : 1;
1084   unsigned want_plt_sym : 1;
1085   unsigned plt_not_loaded : 1;
1086   unsigned plt_alignment : 4;
1087   unsigned can_gc_sections : 1;
1088   unsigned can_refcount : 1;
1089   unsigned want_got_sym : 1;
1090   unsigned want_dynbss : 1;
1091     /* Targets which do not support physical addressing often require
1092        that the p_paddr field in the section header to be set to zero.
1093        This field indicates whether this behavior is required.  */
1094   unsigned want_p_paddr_set_to_zero : 1;
1095 };
1096
1097 /* Information stored for each BFD section in an ELF file.  This
1098    structure is allocated by elf_new_section_hook.  */
1099
1100 struct bfd_elf_section_data
1101 {
1102   /* The ELF header for this section.  */
1103   Elf_Internal_Shdr this_hdr;
1104
1105   /* The ELF header for the reloc section associated with this
1106      section, if any.  */
1107   Elf_Internal_Shdr rel_hdr;
1108
1109   /* If there is a second reloc section associated with this section,
1110      as can happen on Irix 6, this field points to the header.  */
1111   Elf_Internal_Shdr *rel_hdr2;
1112
1113   /* The number of relocations currently assigned to REL_HDR.  */
1114   unsigned int rel_count;
1115
1116   /* The number of relocations currently assigned to REL_HDR2.  */
1117   unsigned int rel_count2;
1118
1119   /* The ELF section number of this section.  */
1120   int this_idx;
1121
1122   /* The ELF section number of the reloc section indicated by
1123      REL_HDR if any.  Only used for an output file.  */
1124   int rel_idx;
1125
1126   /* The ELF section number of the reloc section indicated by
1127      REL_HDR2 if any.  Only used for an output file.  */
1128   int rel_idx2;
1129
1130   /* Used by the backend linker when generating a shared library to
1131      record the dynamic symbol index for a section symbol
1132      corresponding to this section.  A value of 0 means that there is
1133      no dynamic symbol for this section.  */
1134   int dynindx;
1135
1136   /* A pointer to the linked-to section for SHF_LINK_ORDER.  */
1137   asection *linked_to;
1138
1139   /* Used by the backend linker to store the symbol hash table entries
1140      associated with relocs against global symbols.  */
1141   struct elf_link_hash_entry **rel_hashes;
1142
1143   /* A pointer to the swapped relocs.  If the section uses REL relocs,
1144      rather than RELA, all the r_addend fields will be zero.  This
1145      pointer may be NULL.  It is used by the backend linker.  */
1146   Elf_Internal_Rela *relocs;
1147
1148   /* A pointer to a linked list tracking dynamic relocs copied for
1149      local symbols.  */
1150   void *local_dynrel;
1151
1152   /* A pointer to the bfd section used for dynamic relocs.  */
1153   asection *sreloc;
1154
1155   union {
1156     /* Group name, if this section is a member of a group.  */
1157     const char *name;
1158
1159     /* Group signature sym, if this is the SHT_GROUP section.  */
1160     struct bfd_symbol *id;
1161   } group;
1162
1163   /* Optional information about section group; NULL if it doesn't
1164      belongs to any section group. */
1165   asection *sec_group;
1166
1167   /* A linked list of sections in the group.  Circular when used by
1168      the linker.  */
1169   asection *next_in_group;
1170
1171   /* A pointer used for various section optimizations.  */
1172   void *sec_info;
1173 };
1174
1175 #define elf_section_data(sec)  ((struct bfd_elf_section_data*)(sec)->used_by_bfd)
1176 #define elf_linked_to_section(sec) (elf_section_data(sec)->linked_to)
1177 #define elf_section_type(sec)  (elf_section_data(sec)->this_hdr.sh_type)
1178 #define elf_section_flags(sec) (elf_section_data(sec)->this_hdr.sh_flags)
1179 #define elf_group_name(sec)    (elf_section_data(sec)->group.name)
1180 #define elf_group_id(sec)      (elf_section_data(sec)->group.id)
1181 #define elf_next_in_group(sec) (elf_section_data(sec)->next_in_group)
1182 #define elf_sec_group(sec)      (elf_section_data(sec)->sec_group)
1183
1184 /* Return TRUE if section has been discarded.  */
1185 #define elf_discarded_section(sec)                              \
1186   (!bfd_is_abs_section (sec)                                    \
1187    && bfd_is_abs_section ((sec)->output_section)                \
1188    && (sec)->sec_info_type != ELF_INFO_TYPE_MERGE               \
1189    && (sec)->sec_info_type != ELF_INFO_TYPE_JUST_SYMS)
1190
1191 #define get_elf_backend_data(abfd) \
1192   ((const struct elf_backend_data *) (abfd)->xvec->backend_data)
1193
1194 /* This struct is used to pass information to routines called via
1195    elf_link_hash_traverse which must return failure.  */
1196
1197 struct elf_info_failed
1198 {
1199   bfd_boolean failed;
1200   struct bfd_link_info *info;
1201   struct bfd_elf_version_tree *verdefs;
1202 };
1203
1204 /* This structure is used to pass information to
1205    _bfd_elf_link_assign_sym_version.  */
1206
1207 struct elf_assign_sym_version_info
1208 {
1209   /* Output BFD.  */
1210   bfd *output_bfd;
1211   /* General link information.  */
1212   struct bfd_link_info *info;
1213   /* Version tree.  */
1214   struct bfd_elf_version_tree *verdefs;
1215   /* Whether we had a failure.  */
1216   bfd_boolean failed;
1217 };
1218
1219 /* This structure is used to pass information to
1220    _bfd_elf_link_find_version_dependencies.  */
1221
1222 struct elf_find_verdep_info
1223 {
1224   /* Output BFD.  */
1225   bfd *output_bfd;
1226   /* General link information.  */
1227   struct bfd_link_info *info;
1228   /* The number of dependencies.  */
1229   unsigned int vers;
1230   /* Whether we had a failure.  */
1231   bfd_boolean failed;
1232 };
1233
1234 /* Some private data is stashed away for future use using the tdata pointer
1235    in the bfd structure.  */
1236
1237 struct elf_obj_tdata
1238 {
1239   Elf_Internal_Ehdr elf_header[1];      /* Actual data, but ref like ptr */
1240   Elf_Internal_Shdr **elf_sect_ptr;
1241   Elf_Internal_Phdr *phdr;
1242   struct elf_segment_map *segment_map;
1243   struct elf_strtab_hash *strtab_ptr;
1244   int num_locals;
1245   int num_globals;
1246   unsigned int num_elf_sections;        /* elf_sect_ptr size */
1247   int num_section_syms;
1248   asymbol **section_syms;               /* STT_SECTION symbols for each section */
1249   Elf_Internal_Shdr symtab_hdr;
1250   Elf_Internal_Shdr shstrtab_hdr;
1251   Elf_Internal_Shdr strtab_hdr;
1252   Elf_Internal_Shdr dynsymtab_hdr;
1253   Elf_Internal_Shdr dynstrtab_hdr;
1254   Elf_Internal_Shdr dynversym_hdr;
1255   Elf_Internal_Shdr dynverref_hdr;
1256   Elf_Internal_Shdr dynverdef_hdr;
1257   Elf_Internal_Shdr symtab_shndx_hdr;
1258   unsigned int symtab_section, shstrtab_section;
1259   unsigned int strtab_section, dynsymtab_section;
1260   unsigned int symtab_shndx_section;
1261   unsigned int dynversym_section, dynverdef_section, dynverref_section;
1262   file_ptr next_file_pos;
1263   bfd_vma gp;                           /* The gp value */
1264   unsigned int gp_size;                 /* The gp size */
1265
1266   /* Information grabbed from an elf core file.  */
1267   int core_signal;
1268   int core_pid;
1269   int core_lwpid;
1270   char* core_program;
1271   char* core_command;
1272
1273   /* A mapping from external symbols to entries in the linker hash
1274      table, used when linking.  This is indexed by the symbol index
1275      minus the sh_info field of the symbol table header.  */
1276   struct elf_link_hash_entry **sym_hashes;
1277
1278   /* Track usage and final offsets of GOT entries for local symbols.
1279      This array is indexed by symbol index.  Elements are used
1280      identically to "got" in struct elf_link_hash_entry.  */
1281   union
1282     {
1283       bfd_signed_vma *refcounts;
1284       bfd_vma *offsets;
1285       struct got_entry **ents;
1286     } local_got;
1287
1288   /* The linker ELF emulation code needs to let the backend ELF linker
1289      know what filename should be used for a dynamic object if the
1290      dynamic object is found using a search.  The emulation code then
1291      sometimes needs to know what name was actually used.  Until the
1292      file has been added to the linker symbol table, this field holds
1293      the name the linker wants.  After it has been added, it holds the
1294      name actually used, which will be the DT_SONAME entry if there is
1295      one.  */
1296   const char *dt_name;
1297
1298   /* Records the result of `get_program_header_size'.  */
1299   bfd_size_type program_header_size;
1300
1301   /* Used by find_nearest_line entry point.  */
1302   void *line_info;
1303
1304   /* Used by MIPS ELF find_nearest_line entry point.  The structure
1305      could be included directly in this one, but there's no point to
1306      wasting the memory just for the infrequently called
1307      find_nearest_line.  */
1308   struct mips_elf_find_line *find_line_info;
1309
1310   /* A place to stash dwarf1 info for this bfd.  */
1311   struct dwarf1_debug *dwarf1_find_line_info;
1312
1313   /* A place to stash dwarf2 info for this bfd.  */
1314   void *dwarf2_find_line_info;
1315
1316   /* An array of stub sections indexed by symbol number, used by the
1317      MIPS ELF linker.  FIXME: We should figure out some way to only
1318      include this field for a MIPS ELF target.  */
1319   asection **local_stubs;
1320
1321   /* Used to determine if PT_GNU_EH_FRAME segment header should be
1322      created.  */
1323   asection *eh_frame_hdr;
1324
1325   Elf_Internal_Shdr **group_sect_ptr;
1326   int num_group;
1327
1328   /* Number of symbol version definitions we are about to emit.  */
1329   unsigned int cverdefs;
1330
1331   /* Number of symbol version references we are about to emit.  */
1332   unsigned int cverrefs;
1333
1334   /* Segment flags for the PT_GNU_STACK segment.  */
1335   unsigned int stack_flags;
1336
1337   /* Should the PT_GNU_RELRO segment be emitted?  */
1338   bfd_boolean relro;
1339
1340   /* Symbol version definitions in external objects.  */
1341   Elf_Internal_Verdef *verdef;
1342
1343   /* Symbol version references to external objects.  */
1344   Elf_Internal_Verneed *verref;
1345
1346   /* The Irix 5 support uses two virtual sections, which represent
1347      text/data symbols defined in dynamic objects.  */
1348   asymbol *elf_data_symbol;
1349   asymbol *elf_text_symbol;
1350   asection *elf_data_section;
1351   asection *elf_text_section;
1352
1353   /* Whether a dyanmic object was specified normally on the linker
1354      command line, or was specified when --as-needed was in effect,
1355      or was found via a DT_NEEDED entry.  */
1356   enum dynamic_lib_link_class dyn_lib_class;
1357
1358   /* This is set to TRUE if the object was created by the backend
1359      linker.  */
1360   bfd_boolean linker;
1361
1362   /* Irix 5 often screws up the symbol table, sorting local symbols
1363      after global symbols.  This flag is set if the symbol table in
1364      this BFD appears to be screwed up.  If it is, we ignore the
1365      sh_info field in the symbol table header, and always read all the
1366      symbols.  */
1367   bfd_boolean bad_symtab;
1368
1369   /* Used to determine if the e_flags field has been initialized */
1370   bfd_boolean flags_init;
1371 };
1372
1373 #define elf_tdata(bfd)          ((bfd) -> tdata.elf_obj_data)
1374 #define elf_elfheader(bfd)      (elf_tdata(bfd) -> elf_header)
1375 #define elf_elfsections(bfd)    (elf_tdata(bfd) -> elf_sect_ptr)
1376 #define elf_numsections(bfd)    (elf_tdata(bfd) -> num_elf_sections)
1377 #define elf_shstrtab(bfd)       (elf_tdata(bfd) -> strtab_ptr)
1378 #define elf_onesymtab(bfd)      (elf_tdata(bfd) -> symtab_section)
1379 #define elf_symtab_shndx(bfd)   (elf_tdata(bfd) -> symtab_shndx_section)
1380 #define elf_dynsymtab(bfd)      (elf_tdata(bfd) -> dynsymtab_section)
1381 #define elf_dynversym(bfd)      (elf_tdata(bfd) -> dynversym_section)
1382 #define elf_dynverdef(bfd)      (elf_tdata(bfd) -> dynverdef_section)
1383 #define elf_dynverref(bfd)      (elf_tdata(bfd) -> dynverref_section)
1384 #define elf_num_locals(bfd)     (elf_tdata(bfd) -> num_locals)
1385 #define elf_num_globals(bfd)    (elf_tdata(bfd) -> num_globals)
1386 #define elf_section_syms(bfd)   (elf_tdata(bfd) -> section_syms)
1387 #define elf_num_section_syms(bfd) (elf_tdata(bfd) -> num_section_syms)
1388 #define core_prpsinfo(bfd)      (elf_tdata(bfd) -> prpsinfo)
1389 #define core_prstatus(bfd)      (elf_tdata(bfd) -> prstatus)
1390 #define elf_gp(bfd)             (elf_tdata(bfd) -> gp)
1391 #define elf_gp_size(bfd)        (elf_tdata(bfd) -> gp_size)
1392 #define elf_sym_hashes(bfd)     (elf_tdata(bfd) -> sym_hashes)
1393 #define elf_local_got_refcounts(bfd) (elf_tdata(bfd) -> local_got.refcounts)
1394 #define elf_local_got_offsets(bfd) (elf_tdata(bfd) -> local_got.offsets)
1395 #define elf_local_got_ents(bfd) (elf_tdata(bfd) -> local_got.ents)
1396 #define elf_dt_name(bfd)        (elf_tdata(bfd) -> dt_name)
1397 #define elf_dyn_lib_class(bfd)  (elf_tdata(bfd) -> dyn_lib_class)
1398 #define elf_bad_symtab(bfd)     (elf_tdata(bfd) -> bad_symtab)
1399 #define elf_flags_init(bfd)     (elf_tdata(bfd) -> flags_init)
1400 \f
1401 extern void _bfd_elf_swap_verdef_in
1402   (bfd *, const Elf_External_Verdef *, Elf_Internal_Verdef *);
1403 extern void _bfd_elf_swap_verdef_out
1404   (bfd *, const Elf_Internal_Verdef *, Elf_External_Verdef *);
1405 extern void _bfd_elf_swap_verdaux_in
1406   (bfd *, const Elf_External_Verdaux *, Elf_Internal_Verdaux *);
1407 extern void _bfd_elf_swap_verdaux_out
1408   (bfd *, const Elf_Internal_Verdaux *, Elf_External_Verdaux *);
1409 extern void _bfd_elf_swap_verneed_in
1410   (bfd *, const Elf_External_Verneed *, Elf_Internal_Verneed *);
1411 extern void _bfd_elf_swap_verneed_out
1412   (bfd *, const Elf_Internal_Verneed *, Elf_External_Verneed *);
1413 extern void _bfd_elf_swap_vernaux_in
1414   (bfd *, const Elf_External_Vernaux *, Elf_Internal_Vernaux *);
1415 extern void _bfd_elf_swap_vernaux_out
1416   (bfd *, const Elf_Internal_Vernaux *, Elf_External_Vernaux *);
1417 extern void _bfd_elf_swap_versym_in
1418   (bfd *, const Elf_External_Versym *, Elf_Internal_Versym *);
1419 extern void _bfd_elf_swap_versym_out
1420   (bfd *, const Elf_Internal_Versym *, Elf_External_Versym *);
1421
1422 extern int _bfd_elf_section_from_bfd_section
1423   (bfd *, asection *);
1424 extern char *bfd_elf_string_from_elf_section
1425   (bfd *, unsigned, unsigned);
1426 extern char *bfd_elf_get_str_section
1427   (bfd *, unsigned);
1428 extern Elf_Internal_Sym *bfd_elf_get_elf_syms
1429   (bfd *, Elf_Internal_Shdr *, size_t, size_t, Elf_Internal_Sym *, void *,
1430    Elf_External_Sym_Shndx *);
1431 extern const char *bfd_elf_sym_name
1432   (bfd *, Elf_Internal_Shdr *, Elf_Internal_Sym *, asection *);
1433
1434 extern bfd_boolean _bfd_elf_copy_private_bfd_data
1435   (bfd *, bfd *);
1436 extern bfd_boolean _bfd_elf_print_private_bfd_data
1437   (bfd *, void *);
1438 extern void bfd_elf_print_symbol
1439   (bfd *, void *, asymbol *, bfd_print_symbol_type);
1440
1441 extern void _bfd_elf_sprintf_vma
1442   (bfd *, char *, bfd_vma);
1443 extern void _bfd_elf_fprintf_vma
1444   (bfd *, void *, bfd_vma);
1445
1446 extern unsigned int _bfd_elf_eh_frame_address_size
1447   (bfd *, asection *);
1448 extern bfd_byte _bfd_elf_encode_eh_address
1449   (bfd *abfd, struct bfd_link_info *info, asection *osec, bfd_vma offset,
1450    asection *loc_sec, bfd_vma loc_offset, bfd_vma *encoded);
1451 extern bfd_boolean _bfd_elf_can_make_relative
1452   (bfd *input_bfd, struct bfd_link_info *info, asection *eh_frame_section);
1453
1454 extern enum elf_reloc_type_class _bfd_elf_reloc_type_class
1455   (const Elf_Internal_Rela *);
1456 extern bfd_vma _bfd_elf_rela_local_sym
1457   (bfd *, Elf_Internal_Sym *, asection **, Elf_Internal_Rela *);
1458 extern bfd_vma _bfd_elf_rel_local_sym
1459   (bfd *, Elf_Internal_Sym *, asection **, bfd_vma);
1460 extern bfd_vma _bfd_elf_section_offset
1461   (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1462
1463 extern unsigned long bfd_elf_hash
1464   (const char *);
1465
1466 extern bfd_reloc_status_type bfd_elf_generic_reloc
1467   (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
1468 extern bfd_boolean bfd_elf_mkobject
1469   (bfd *);
1470 extern bfd_boolean bfd_elf_mkcorefile
1471   (bfd *);
1472 extern Elf_Internal_Shdr *bfd_elf_find_section
1473   (bfd *, char *);
1474 extern bfd_boolean _bfd_elf_make_section_from_shdr
1475   (bfd *, Elf_Internal_Shdr *, const char *, int);
1476 extern bfd_boolean _bfd_elf_make_section_from_phdr
1477   (bfd *, Elf_Internal_Phdr *, int, const char *);
1478 extern struct bfd_hash_entry *_bfd_elf_link_hash_newfunc
1479   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
1480 extern struct bfd_link_hash_table *_bfd_elf_link_hash_table_create
1481   (bfd *);
1482 extern void _bfd_elf_link_hash_copy_indirect
1483   (struct bfd_link_info *, struct elf_link_hash_entry *,
1484    struct elf_link_hash_entry *);
1485 extern void _bfd_elf_link_hash_hide_symbol
1486   (struct bfd_link_info *, struct elf_link_hash_entry *, bfd_boolean);
1487 extern bfd_boolean _bfd_elf_link_hash_fixup_symbol
1488   (struct bfd_link_info *, struct elf_link_hash_entry *);
1489 extern bfd_boolean _bfd_elf_link_hash_table_init
1490   (struct elf_link_hash_table *, bfd *,
1491    struct bfd_hash_entry *(*)
1492      (struct bfd_hash_entry *, struct bfd_hash_table *, const char *),
1493    unsigned int);
1494 extern bfd_boolean _bfd_elf_slurp_version_tables
1495   (bfd *, bfd_boolean);
1496 extern bfd_boolean _bfd_elf_merge_sections
1497   (bfd *, struct bfd_link_info *);
1498 extern bfd_boolean _bfd_elf_match_sections_by_type
1499   (bfd *, const asection *, bfd *, const asection *);
1500 extern bfd_boolean bfd_elf_is_group_section
1501   (bfd *, const struct bfd_section *);
1502 extern void _bfd_elf_section_already_linked
1503   (bfd *, struct bfd_section *);
1504 extern void bfd_elf_set_group_contents
1505   (bfd *, asection *, void *);
1506 extern asection *_bfd_elf_check_kept_section
1507   (asection *);
1508 extern void _bfd_elf_link_just_syms
1509   (asection *, struct bfd_link_info *);
1510 extern bfd_boolean _bfd_elf_copy_private_header_data
1511   (bfd *, bfd *);
1512 extern bfd_boolean _bfd_elf_copy_private_symbol_data
1513   (bfd *, asymbol *, bfd *, asymbol *);
1514 #define _bfd_generic_init_private_section_data \
1515   _bfd_elf_init_private_section_data
1516 extern bfd_boolean _bfd_elf_init_private_section_data
1517   (bfd *, asection *, bfd *, asection *, struct bfd_link_info *);
1518 extern bfd_boolean _bfd_elf_copy_private_section_data
1519   (bfd *, asection *, bfd *, asection *);
1520 extern bfd_boolean _bfd_elf_write_object_contents
1521   (bfd *);
1522 extern bfd_boolean _bfd_elf_write_corefile_contents
1523   (bfd *);
1524 extern bfd_boolean _bfd_elf_set_section_contents
1525   (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type);
1526 extern long _bfd_elf_get_symtab_upper_bound
1527   (bfd *);
1528 extern long _bfd_elf_canonicalize_symtab
1529   (bfd *, asymbol **);
1530 extern long _bfd_elf_get_dynamic_symtab_upper_bound
1531   (bfd *);
1532 extern long _bfd_elf_canonicalize_dynamic_symtab
1533   (bfd *, asymbol **);
1534 extern long _bfd_elf_get_synthetic_symtab
1535   (bfd *, long, asymbol **, long, asymbol **, asymbol **);
1536 extern long _bfd_elf_get_reloc_upper_bound
1537   (bfd *, sec_ptr);
1538 extern long _bfd_elf_canonicalize_reloc
1539   (bfd *, sec_ptr, arelent **, asymbol **);
1540 extern long _bfd_elf_get_dynamic_reloc_upper_bound
1541   (bfd *);
1542 extern long _bfd_elf_canonicalize_dynamic_reloc
1543   (bfd *, arelent **, asymbol **);
1544 extern asymbol *_bfd_elf_make_empty_symbol
1545   (bfd *);
1546 extern void _bfd_elf_get_symbol_info
1547   (bfd *, asymbol *, symbol_info *);
1548 extern bfd_boolean _bfd_elf_is_local_label_name
1549   (bfd *, const char *);
1550 extern alent *_bfd_elf_get_lineno
1551   (bfd *, asymbol *);
1552 extern bfd_boolean _bfd_elf_set_arch_mach
1553   (bfd *, enum bfd_architecture, unsigned long);
1554 extern bfd_boolean _bfd_elf_find_nearest_line
1555   (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **,
1556    unsigned int *);
1557 extern bfd_boolean _bfd_elf_find_line
1558   (bfd *, asymbol **, asymbol *, const char **, unsigned int *);
1559 #define _bfd_generic_find_line _bfd_elf_find_line
1560 extern bfd_boolean _bfd_elf_find_inliner_info
1561   (bfd *, const char **, const char **, unsigned int *);
1562 #define _bfd_elf_read_minisymbols _bfd_generic_read_minisymbols
1563 #define _bfd_elf_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
1564 extern int _bfd_elf_sizeof_headers
1565   (bfd *, bfd_boolean);
1566 extern bfd_boolean _bfd_elf_new_section_hook
1567   (bfd *, asection *);
1568 extern bfd_boolean _bfd_elf_init_reloc_shdr
1569   (bfd *, Elf_Internal_Shdr *, asection *, bfd_boolean);
1570 extern const struct bfd_elf_special_section *_bfd_elf_get_special_section
1571   (const char *, const struct bfd_elf_special_section *, unsigned int);
1572 extern const struct bfd_elf_special_section *_bfd_elf_get_sec_type_attr
1573   (bfd *, asection *);
1574
1575 /* If the target doesn't have reloc handling written yet:  */
1576 extern void _bfd_elf_no_info_to_howto
1577   (bfd *, arelent *, Elf_Internal_Rela *);
1578
1579 extern bfd_boolean bfd_section_from_shdr
1580   (bfd *, unsigned int shindex);
1581 extern bfd_boolean bfd_section_from_phdr
1582   (bfd *, Elf_Internal_Phdr *, int);
1583
1584 extern int _bfd_elf_symbol_from_bfd_symbol
1585   (bfd *, asymbol **);
1586
1587 extern asection *bfd_section_from_r_symndx
1588   (bfd *, struct sym_sec_cache *, asection *, unsigned long);
1589 extern asection *bfd_section_from_elf_index
1590   (bfd *, unsigned int);
1591 extern struct bfd_strtab_hash *_bfd_elf_stringtab_init
1592   (void);
1593
1594 extern struct elf_strtab_hash * _bfd_elf_strtab_init
1595   (void);
1596 extern void _bfd_elf_strtab_free
1597   (struct elf_strtab_hash *);
1598 extern bfd_size_type _bfd_elf_strtab_add
1599   (struct elf_strtab_hash *, const char *, bfd_boolean);
1600 extern void _bfd_elf_strtab_addref
1601   (struct elf_strtab_hash *, bfd_size_type);
1602 extern void _bfd_elf_strtab_delref
1603   (struct elf_strtab_hash *, bfd_size_type);
1604 extern void _bfd_elf_strtab_clear_all_refs
1605   (struct elf_strtab_hash *);
1606 extern bfd_size_type _bfd_elf_strtab_size
1607   (struct elf_strtab_hash *);
1608 extern bfd_size_type _bfd_elf_strtab_offset
1609   (struct elf_strtab_hash *, bfd_size_type);
1610 extern bfd_boolean _bfd_elf_strtab_emit
1611   (bfd *, struct elf_strtab_hash *);
1612 extern void _bfd_elf_strtab_finalize
1613   (struct elf_strtab_hash *);
1614
1615 extern bfd_boolean _bfd_elf_discard_section_eh_frame
1616   (bfd *, struct bfd_link_info *, asection *,
1617    bfd_boolean (*) (bfd_vma, void *), struct elf_reloc_cookie *);
1618 extern bfd_boolean _bfd_elf_discard_section_eh_frame_hdr
1619   (bfd *, struct bfd_link_info *);
1620 extern bfd_vma _bfd_elf_eh_frame_section_offset
1621   (bfd *, struct bfd_link_info *, asection *, bfd_vma);
1622 extern bfd_boolean _bfd_elf_write_section_eh_frame
1623   (bfd *, struct bfd_link_info *, asection *, bfd_byte *);
1624 extern bfd_boolean _bfd_elf_write_section_eh_frame_hdr
1625   (bfd *, struct bfd_link_info *);
1626 extern bfd_boolean _bfd_elf_maybe_strip_eh_frame_hdr
1627   (struct bfd_link_info *);
1628
1629 extern bfd_boolean _bfd_elf_merge_symbol
1630   (bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *,
1631    asection **, bfd_vma *, unsigned int *,
1632    struct elf_link_hash_entry **, bfd_boolean *,
1633    bfd_boolean *, bfd_boolean *, bfd_boolean *);
1634
1635 extern bfd_boolean _bfd_elf_add_default_symbol
1636   (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
1637    const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
1638    bfd_boolean *, bfd_boolean);
1639
1640 extern bfd_boolean _bfd_elf_export_symbol
1641   (struct elf_link_hash_entry *, void *);
1642
1643 extern bfd_boolean _bfd_elf_link_find_version_dependencies
1644   (struct elf_link_hash_entry *, void *);
1645
1646 extern bfd_boolean _bfd_elf_link_assign_sym_version
1647   (struct elf_link_hash_entry *, void *);
1648
1649 extern long _bfd_elf_link_lookup_local_dynindx
1650   (struct bfd_link_info *, bfd *, long);
1651 extern bfd_boolean _bfd_elf_compute_section_file_positions
1652   (bfd *, struct bfd_link_info *);
1653 extern void _bfd_elf_assign_file_positions_for_relocs
1654   (bfd *);
1655 extern file_ptr _bfd_elf_assign_file_position_for_section
1656   (Elf_Internal_Shdr *, file_ptr, bfd_boolean);
1657
1658 extern bfd_boolean _bfd_elf_validate_reloc
1659   (bfd *, arelent *);
1660
1661 extern bfd_boolean _bfd_elf_link_create_dynamic_sections
1662   (bfd *, struct bfd_link_info *);
1663 extern bfd_boolean _bfd_elf_link_omit_section_dynsym
1664   (bfd *, struct bfd_link_info *, asection *);
1665 extern bfd_boolean _bfd_elf_create_dynamic_sections
1666   (bfd *, struct bfd_link_info *);
1667 extern bfd_boolean _bfd_elf_create_got_section
1668   (bfd *, struct bfd_link_info *);
1669 extern struct elf_link_hash_entry *_bfd_elf_define_linkage_sym
1670   (bfd *, struct bfd_link_info *, asection *, const char *);
1671
1672 extern bfd_boolean _bfd_elfcore_make_pseudosection
1673   (bfd *, char *, size_t, ufile_ptr);
1674 extern char *_bfd_elfcore_strndup
1675   (bfd *, char *, size_t);
1676
1677 extern Elf_Internal_Rela *_bfd_elf_link_read_relocs
1678   (bfd *, asection *, void *, Elf_Internal_Rela *, bfd_boolean);
1679
1680 extern bfd_boolean _bfd_elf_link_size_reloc_section
1681   (bfd *, Elf_Internal_Shdr *, asection *);
1682
1683 extern bfd_boolean _bfd_elf_link_output_relocs
1684   (bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *,
1685    struct elf_link_hash_entry **);
1686
1687 extern bfd_boolean _bfd_elf_fix_symbol_flags
1688   (struct elf_link_hash_entry *, struct elf_info_failed *);
1689
1690 extern bfd_boolean _bfd_elf_adjust_dynamic_symbol
1691   (struct elf_link_hash_entry *, void *);
1692
1693 extern bfd_boolean _bfd_elf_link_sec_merge_syms
1694   (struct elf_link_hash_entry *, void *);
1695
1696 extern bfd_boolean _bfd_elf_dynamic_symbol_p
1697   (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1698
1699 extern bfd_boolean _bfd_elf_symbol_refs_local_p
1700   (struct elf_link_hash_entry *, struct bfd_link_info *, bfd_boolean);
1701
1702 extern bfd_boolean bfd_elf_match_symbols_in_sections
1703   (asection *sec1, asection *sec2);
1704
1705 extern bfd_boolean _bfd_elf_setup_sections
1706   (bfd *);
1707
1708 extern const bfd_target *bfd_elf32_object_p
1709   (bfd *);
1710 extern const bfd_target *bfd_elf32_core_file_p
1711   (bfd *);
1712 extern char *bfd_elf32_core_file_failing_command
1713   (bfd *);
1714 extern int bfd_elf32_core_file_failing_signal
1715   (bfd *);
1716 extern bfd_boolean bfd_elf32_core_file_matches_executable_p
1717   (bfd *, bfd *);
1718
1719 extern void bfd_elf32_swap_symbol_in
1720   (bfd *, const void *, const void *, Elf_Internal_Sym *);
1721 extern void bfd_elf32_swap_symbol_out
1722   (bfd *, const Elf_Internal_Sym *, void *, void *);
1723 extern void bfd_elf32_swap_reloc_in
1724   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1725 extern void bfd_elf32_swap_reloc_out
1726   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1727 extern void bfd_elf32_swap_reloca_in
1728   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1729 extern void bfd_elf32_swap_reloca_out
1730   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1731 extern void bfd_elf32_swap_phdr_in
1732   (bfd *, const Elf32_External_Phdr *, Elf_Internal_Phdr *);
1733 extern void bfd_elf32_swap_phdr_out
1734   (bfd *, const Elf_Internal_Phdr *, Elf32_External_Phdr *);
1735 extern void bfd_elf32_swap_dyn_in
1736   (bfd *, const void *, Elf_Internal_Dyn *);
1737 extern void bfd_elf32_swap_dyn_out
1738   (bfd *, const Elf_Internal_Dyn *, void *);
1739 extern long bfd_elf32_slurp_symbol_table
1740   (bfd *, asymbol **, bfd_boolean);
1741 extern bfd_boolean bfd_elf32_write_shdrs_and_ehdr
1742   (bfd *);
1743 extern int bfd_elf32_write_out_phdrs
1744   (bfd *, const Elf_Internal_Phdr *, unsigned int);
1745 extern void bfd_elf32_write_relocs
1746   (bfd *, asection *, void *);
1747 extern bfd_boolean bfd_elf32_slurp_reloc_table
1748   (bfd *, asection *, asymbol **, bfd_boolean);
1749
1750 extern const bfd_target *bfd_elf64_object_p
1751   (bfd *);
1752 extern const bfd_target *bfd_elf64_core_file_p
1753   (bfd *);
1754 extern char *bfd_elf64_core_file_failing_command
1755   (bfd *);
1756 extern int bfd_elf64_core_file_failing_signal
1757   (bfd *);
1758 extern bfd_boolean bfd_elf64_core_file_matches_executable_p
1759   (bfd *, bfd *);
1760
1761 extern void bfd_elf64_swap_symbol_in
1762   (bfd *, const void *, const void *, Elf_Internal_Sym *);
1763 extern void bfd_elf64_swap_symbol_out
1764   (bfd *, const Elf_Internal_Sym *, void *, void *);
1765 extern void bfd_elf64_swap_reloc_in
1766   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1767 extern void bfd_elf64_swap_reloc_out
1768   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1769 extern void bfd_elf64_swap_reloca_in
1770   (bfd *, const bfd_byte *, Elf_Internal_Rela *);
1771 extern void bfd_elf64_swap_reloca_out
1772   (bfd *, const Elf_Internal_Rela *, bfd_byte *);
1773 extern void bfd_elf64_swap_phdr_in
1774   (bfd *, const Elf64_External_Phdr *, Elf_Internal_Phdr *);
1775 extern void bfd_elf64_swap_phdr_out
1776   (bfd *, const Elf_Internal_Phdr *, Elf64_External_Phdr *);
1777 extern void bfd_elf64_swap_dyn_in
1778   (bfd *, const void *, Elf_Internal_Dyn *);
1779 extern void bfd_elf64_swap_dyn_out
1780   (bfd *, const Elf_Internal_Dyn *, void *);
1781 extern long bfd_elf64_slurp_symbol_table
1782   (bfd *, asymbol **, bfd_boolean);
1783 extern bfd_boolean bfd_elf64_write_shdrs_and_ehdr
1784   (bfd *);
1785 extern int bfd_elf64_write_out_phdrs
1786   (bfd *, const Elf_Internal_Phdr *, unsigned int);
1787 extern void bfd_elf64_write_relocs
1788   (bfd *, asection *, void *);
1789 extern bfd_boolean bfd_elf64_slurp_reloc_table
1790   (bfd *, asection *, asymbol **, bfd_boolean);
1791
1792 extern struct elf_link_hash_entry *_bfd_elf_archive_symbol_lookup
1793   (bfd *, struct bfd_link_info *, const char *);
1794 extern bfd_boolean bfd_elf_link_add_symbols
1795   (bfd *, struct bfd_link_info *);
1796 extern bfd_boolean _bfd_elf_add_dynamic_entry
1797   (struct bfd_link_info *, bfd_vma, bfd_vma);
1798
1799 extern bfd_boolean bfd_elf_link_record_dynamic_symbol
1800   (struct bfd_link_info *, struct elf_link_hash_entry *);
1801
1802 extern int bfd_elf_link_record_local_dynamic_symbol
1803   (struct bfd_link_info *, bfd *, long);
1804
1805 extern bfd_boolean _bfd_elf_close_and_cleanup
1806   (bfd *);
1807
1808 extern bfd_boolean _bfd_elf_common_definition
1809   (Elf_Internal_Sym *);
1810
1811 extern unsigned int _bfd_elf_common_section_index
1812   (asection *);
1813
1814 extern asection *_bfd_elf_common_section
1815   (asection *);
1816
1817 extern void _bfd_dwarf2_cleanup_debug_info
1818   (bfd *);
1819
1820 extern bfd_reloc_status_type _bfd_elf_rel_vtable_reloc_fn
1821   (bfd *, arelent *, struct bfd_symbol *, void *,
1822    asection *, bfd *, char **);
1823
1824 extern bfd_boolean bfd_elf_final_link
1825   (bfd *, struct bfd_link_info *);
1826
1827 extern bfd_boolean bfd_elf_gc_mark_dynamic_ref_symbol
1828   (struct elf_link_hash_entry *h, void *inf);
1829
1830 extern bfd_boolean bfd_elf_gc_sections
1831   (bfd *, struct bfd_link_info *);
1832
1833 extern bfd_boolean bfd_elf_gc_record_vtinherit
1834   (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
1835
1836 extern bfd_boolean bfd_elf_gc_record_vtentry
1837   (bfd *, asection *, struct elf_link_hash_entry *, bfd_vma);
1838
1839 extern bfd_boolean _bfd_elf_gc_mark
1840   (struct bfd_link_info *, asection *,
1841    asection * (*) (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
1842                    struct elf_link_hash_entry *, Elf_Internal_Sym *));
1843
1844 extern bfd_boolean bfd_elf_gc_common_finalize_got_offsets
1845   (bfd *, struct bfd_link_info *);
1846
1847 extern bfd_boolean bfd_elf_gc_common_final_link
1848   (bfd *, struct bfd_link_info *);
1849
1850 extern bfd_boolean bfd_elf_reloc_symbol_deleted_p
1851   (bfd_vma, void *);
1852
1853 extern struct elf_segment_map *
1854 _bfd_elf_make_dynamic_segment
1855   (bfd *, asection *);
1856
1857 /* Exported interface for writing elf corefile notes. */
1858 extern char *elfcore_write_note
1859   (bfd *, char *, int *, const char *, int, const void *, int);
1860 extern char *elfcore_write_prpsinfo
1861   (bfd *, char *, int *, const char *, const char *);
1862 extern char *elfcore_write_prstatus
1863   (bfd *, char *, int *, long, int, const void *);
1864 extern char * elfcore_write_pstatus
1865   (bfd *, char *, int *, long, int, const void *);
1866 extern char *elfcore_write_prfpreg
1867   (bfd *, char *, int *, const void *, int);
1868 extern char *elfcore_write_prxfpreg
1869   (bfd *, char *, int *, const void *, int);
1870 extern char *elfcore_write_lwpstatus
1871   (bfd *, char *, int *, long, int, const void *);
1872
1873 extern bfd *_bfd_elf32_bfd_from_remote_memory
1874   (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1875    int (*target_read_memory) (bfd_vma, bfd_byte *, int));
1876 extern bfd *_bfd_elf64_bfd_from_remote_memory
1877   (bfd *templ, bfd_vma ehdr_vma, bfd_vma *loadbasep,
1878    int (*target_read_memory) (bfd_vma, bfd_byte *, int));
1879
1880 /* Large common section.  */
1881 extern asection _bfd_elf_large_com_section;
1882
1883 /* SH ELF specific routine.  */
1884
1885 extern bfd_boolean _sh_elf_set_mach_from_flags
1886   (bfd *);
1887
1888 /* This is the condition under which finish_dynamic_symbol will be called.
1889    If our finish_dynamic_symbol isn't called, we'll need to do something
1890    about initializing any .plt and .got entries in relocate_section.  */
1891 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1892   ((DYN)                                                                \
1893    && ((SHARED) || !(H)->forced_local)                                  \
1894    && ((H)->dynindx != -1 || (H)->forced_local))
1895
1896 /* This macro is to avoid lots of duplicated code in the body
1897    of xxx_relocate_section() in the various elfxx-xxxx.c files.  */
1898 #define RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel,    \
1899                                 r_symndx, symtab_hdr, sym_hashes,       \
1900                                 h, sec, relocation,                     \
1901                                 unresolved_reloc, warned)               \
1902   do                                                                    \
1903     {                                                                   \
1904       /* It seems this can happen with erroneous or unsupported         \
1905          input (mixing a.out and elf in an archive, for example.)  */   \
1906       if (sym_hashes == NULL)                                           \
1907         return FALSE;                                                   \
1908                                                                         \
1909       h = sym_hashes[r_symndx - symtab_hdr->sh_info];                   \
1910                                                                         \
1911       while (h->root.type == bfd_link_hash_indirect                     \
1912              || h->root.type == bfd_link_hash_warning)                  \
1913         h = (struct elf_link_hash_entry *) h->root.u.i.link;            \
1914                                                                         \
1915       warned = FALSE;                                                   \
1916       unresolved_reloc = FALSE;                                         \
1917       relocation = 0;                                                   \
1918       if (h->root.type == bfd_link_hash_defined                         \
1919           || h->root.type == bfd_link_hash_defweak)                     \
1920         {                                                               \
1921           sec = h->root.u.def.section;                                  \
1922           if (sec == NULL                                               \
1923               || sec->output_section == NULL)                           \
1924             /* Set a flag that will be cleared later if we find a       \
1925                relocation value for this symbol.  output_section        \
1926                is typically NULL for symbols satisfied by a shared      \
1927                library.  */                                             \
1928             unresolved_reloc = TRUE;                                    \
1929           else                                                          \
1930             relocation = (h->root.u.def.value                           \
1931                           + sec->output_section->vma                    \
1932                           + sec->output_offset);                        \
1933         }                                                               \
1934       else if (h->root.type == bfd_link_hash_undefweak)                 \
1935         ;                                                               \
1936       else if (info->unresolved_syms_in_objects == RM_IGNORE            \
1937                && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)          \
1938         ;                                                               \
1939       else                                                              \
1940         {                                                               \
1941           bfd_boolean err;                                              \
1942           err = (info->unresolved_syms_in_objects == RM_GENERATE_ERROR  \
1943                  || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT);       \
1944           if (!info->callbacks->undefined_symbol (info,                 \
1945                                                   h->root.root.string,  \
1946                                                   input_bfd,            \
1947                                                   input_section,        \
1948                                                   rel->r_offset, err))  \
1949             return FALSE;                                               \
1950           warned = TRUE;                                                \
1951         }                                                               \
1952     }                                                                   \
1953   while (0)
1954
1955 #endif /* _LIBELF_H_ */