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