bfd/libcoff-in.h

   1 /* BFD COFF object file private structure.
   2    Copyright (C) 1990-2014 Free Software Foundation, Inc.
   3    Written by Cygnus Support.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "bfdlink.h"
  23
  24 /* Object file tdata; access macros.  */
  25
  26 #define coff_data(bfd)                ((bfd)->tdata.coff_obj_data)
  27 #define obj_pe(bfd)                   (coff_data (bfd)->pe)
  28 #define obj_symbols(bfd)              (coff_data (bfd)->symbols)
  29 #define obj_sym_filepos(bfd)          (coff_data (bfd)->sym_filepos)
  30 #define obj_relocbase(bfd)            (coff_data (bfd)->relocbase)
  31 #define obj_raw_syments(bfd)          (coff_data (bfd)->raw_syments)
  32 #define obj_raw_syment_count(bfd)     (coff_data (bfd)->raw_syment_count)
  33 #define obj_convert(bfd)              (coff_data (bfd)->conversion_table)
  34 #define obj_conv_table_size(bfd)      (coff_data (bfd)->conv_table_size)
  35 #define obj_coff_external_syms(bfd)   (coff_data (bfd)->external_syms)
  36 #define obj_coff_keep_syms(bfd)       (coff_data (bfd)->keep_syms)
  37 #define obj_coff_strings(bfd)         (coff_data (bfd)->strings)
  38 #define obj_coff_keep_strings(bfd)    (coff_data (bfd)->keep_strings)
  39 #define obj_coff_sym_hashes(bfd)      (coff_data (bfd)->sym_hashes)
  40 #define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written)
  41 #define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map)
  42
  43 /* `Tdata' information kept for COFF files.  */
  44
  45 typedef struct coff_tdata
  46 {
  47   struct coff_symbol_struct *symbols;   /* Symtab for input bfd.  */
  48   unsigned int *conversion_table;
  49   int conv_table_size;
  50   file_ptr sym_filepos;
  51
  52   struct coff_ptr_struct *raw_syments;
  53   unsigned long raw_syment_count;
  54
  55   /* These are only valid once writing has begun.  */
  56   unsigned long int relocbase;
  57
  58   /* These members communicate important constants about the symbol table
  59      to GDB's symbol-reading code.  These `constants' unfortunately vary
  60      from coff implementation to implementation...  */
  61   unsigned local_n_btmask;
  62   unsigned local_n_btshft;
  63   unsigned local_n_tmask;
  64   unsigned local_n_tshift;
  65   unsigned local_symesz;
  66   unsigned local_auxesz;
  67   unsigned local_linesz;
  68
  69   /* The unswapped external symbols.  May be NULL.  Read by
  70      _bfd_coff_get_external_symbols.  */
  71   void * external_syms;
  72   /* If this is TRUE, the external_syms may not be freed.  */
  73   bfd_boolean keep_syms;
  74
  75   /* The string table.  May be NULL.  Read by
  76      _bfd_coff_read_string_table.  */
  77   char *strings;
  78   /* If this is TRUE, the strings may not be freed.  */
  79   bfd_boolean keep_strings;
  80   /* If this is TRUE, the strings have been written out already.  */
  81   bfd_boolean strings_written;
  82
  83   /* Is this a PE format coff file?  */
  84   int pe;
  85   /* Used by the COFF backend linker.  */
  86   struct coff_link_hash_entry **sym_hashes;
  87
  88   /* Used by the pe linker for PowerPC.  */
  89   int *local_toc_sym_map;
  90
  91   struct bfd_link_info *link_info;
  92
  93   /* Used by coff_find_nearest_line.  */
  94   void * line_info;
  95
  96   /* A place to stash dwarf2 info for this bfd.  */
  97   void * dwarf2_find_line_info;
  98
  99   /* The timestamp from the COFF file header.  */
 100   long timestamp;
 101
 102   /* Copy of some of the f_flags bits in the COFF filehdr structure,
 103      used by ARM code.  */
 104   flagword flags;
 105
 106   /* coff-stgo32 EXE stub header after BFD tdata has been allocated.  Its data
 107      is kept in internal_filehdr.go32stub beforehand.  */
 108   char *go32stub;
 109 } coff_data_type;
 110
 111 /* Tdata for pe image files.  */
 112 typedef struct pe_tdata
 113 {
 114   coff_data_type coff;
 115   struct internal_extra_pe_aouthdr pe_opthdr;
 116   int dll;
 117   int has_reloc_section;
 118   int dont_strip_reloc;
 119   bfd_boolean insert_timestamp;
 120   bfd_boolean (*in_reloc_p) (bfd *, reloc_howto_type *);
 121   flagword real_flags;
 122
 123   /* Build-id info.  */
 124   struct
 125   {
 126     bfd_boolean (*after_write_object_contents) (bfd *);
 127     const char *style;
 128     asection *sec;
 129   } build_id;
 130 } pe_data_type;
 131
 132 #define pe_data(bfd)            ((bfd)->tdata.pe_obj_data)
 133
 134 /* Tdata for XCOFF files.  */
 135
 136 struct xcoff_tdata
 137 {
 138   /* Basic COFF information.  */
 139   coff_data_type coff;
 140
 141   /* TRUE if this is an XCOFF64 file. */
 142   bfd_boolean xcoff64;
 143
 144   /* TRUE if a large a.out header should be generated.  */
 145   bfd_boolean full_aouthdr;
 146
 147   /* TOC value.  */
 148   bfd_vma toc;
 149
 150   /* Index of section holding TOC.  */
 151   int sntoc;
 152
 153   /* Index of section holding entry point.  */
 154   int snentry;
 155
 156   /* .text alignment from optional header.  */
 157   int text_align_power;
 158
 159   /* .data alignment from optional header.  */
 160   int data_align_power;
 161
 162   /* modtype from optional header.  */
 163   short modtype;
 164
 165   /* cputype from optional header.  */
 166   short cputype;
 167
 168   /* maxdata from optional header.  */
 169   bfd_vma maxdata;
 170
 171   /* maxstack from optional header.  */
 172   bfd_vma maxstack;
 173
 174   /* Used by the XCOFF backend linker.  */
 175   asection **csects;
 176   long *debug_indices;
 177   unsigned int *lineno_counts;
 178   unsigned int import_file_id;
 179 };
 180
 181 #define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data)
 182
 183 /* We take the address of the first element of an asymbol to ensure that the
 184    macro is only ever applied to an asymbol.  */
 185 #define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd)))
 186
 187 /* The used_by_bfd field of a section may be set to a pointer to this
 188    structure.  */
 189
 190 struct coff_section_tdata
 191 {
 192   /* The relocs, swapped into COFF internal form.  This may be NULL.  */
 193   struct internal_reloc *relocs;
 194   /* If this is TRUE, the relocs entry may not be freed.  */
 195   bfd_boolean keep_relocs;
 196   /* The section contents.  This may be NULL.  */
 197   bfd_byte *contents;
 198   /* If this is TRUE, the contents entry may not be freed.  */
 199   bfd_boolean keep_contents;
 200   /* Information cached by coff_find_nearest_line.  */
 201   bfd_vma offset;
 202   unsigned int i;
 203   const char *function;
 204   /* Optional information about a COMDAT entry; NULL if not COMDAT. */
 205   struct coff_comdat_info *comdat;
 206   int line_base;
 207   /* A pointer used for .stab linking optimizations.  */
 208   void * stab_info;
 209   /* Available for individual backends.  */
 210   void * tdata;
 211 };
 212
 213 /* An accessor macro for the coff_section_tdata structure.  */
 214 #define coff_section_data(abfd, sec) \
 215   ((struct coff_section_tdata *) (sec)->used_by_bfd)
 216
 217 /* Tdata for sections in XCOFF files.  This is used by the linker.  */
 218
 219 struct xcoff_section_tdata
 220 {
 221   /* Used for XCOFF csects created by the linker; points to the real
 222      XCOFF section which contains this csect.  */
 223   asection *enclosing;
 224   /* The lineno_count field for the enclosing section, because we are
 225      going to clobber it there.  */
 226   unsigned int lineno_count;
 227   /* The first and last symbol indices for symbols used by this csect.  */
 228   unsigned long first_symndx;
 229   unsigned long last_symndx;
 230 };
 231
 232 /* An accessor macro the xcoff_section_tdata structure.  */
 233 #define xcoff_section_data(abfd, sec) \
 234   ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
 235
 236 /* Tdata for sections in PE files.  */
 237
 238 struct pei_section_tdata
 239 {
 240   /* The virtual size of the section.  */
 241   bfd_size_type virt_size;
 242   /* The PE section flags.  */
 243   long pe_flags;
 244 };
 245
 246 /* An accessor macro for the pei_section_tdata structure.  */
 247 #define pei_section_data(abfd, sec) \
 248   ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
 249
 250 /* COFF linker hash table entries.  */
 251
 252 struct coff_link_hash_entry
 253 {
 254   struct bfd_link_hash_entry root;
 255
 256   /* Symbol index in output file.  Set to -1 initially.  Set to -2 if
 257      there is a reloc against this symbol.  */
 258   long indx;
 259
 260   /* Symbol type.  */
 261   unsigned short type;
 262
 263   /* Symbol class.  */
 264   unsigned char symbol_class;
 265
 266   /* Number of auxiliary entries.  */
 267   char numaux;
 268
 269   /* BFD to take auxiliary entries from.  */
 270   bfd *auxbfd;
 271
 272   /* Pointer to array of auxiliary entries, if any.  */
 273   union internal_auxent *aux;
 274
 275   /* Flag word; legal values follow.  */
 276   unsigned short coff_link_hash_flags;
 277   /* Symbol is a PE section symbol.  */
 278 #define COFF_LINK_HASH_PE_SECTION_SYMBOL (01)
 279 };
 280
 281 /* COFF linker hash table.  */
 282
 283 struct coff_link_hash_table
 284 {
 285   struct bfd_link_hash_table root;
 286   /* A pointer to information used to link stabs in sections.  */
 287   struct stab_info stab_info;
 288 };
 289
 290 /* Look up an entry in a COFF linker hash table.  */
 291
 292 #define coff_link_hash_lookup(table, string, create, copy, follow)      \
 293   ((struct coff_link_hash_entry *)                                      \
 294    bfd_link_hash_lookup (&(table)->root, (string), (create),            \
 295                          (copy), (follow)))
 296
 297 /* Traverse a COFF linker hash table.  */
 298
 299 #define coff_link_hash_traverse(table, func, info)                      \
 300   (bfd_link_hash_traverse                                               \
 301    (&(table)->root,                                                     \
 302     (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
 303     (info)))
 304
 305 /* Get the COFF linker hash table from a link_info structure.  */
 306
 307 #define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash))
 308
 309 /* Functions in coffgen.c.  */
 310 extern const bfd_target *coff_object_p
 311   (bfd *);
 312 extern struct bfd_section *coff_section_from_bfd_index
 313   (bfd *, int);
 314 extern long coff_get_symtab_upper_bound
 315   (bfd *);
 316 extern long coff_canonicalize_symtab
 317   (bfd *, asymbol **);
 318 extern int coff_count_linenumbers
 319   (bfd *);
 320 extern struct coff_symbol_struct *coff_symbol_from
 321   (bfd *, asymbol *);
 322 extern bfd_boolean coff_renumber_symbols
 323   (bfd *, int *);
 324 extern void coff_mangle_symbols
 325   (bfd *);
 326 extern bfd_boolean coff_write_symbols
 327   (bfd *);
 328 extern bfd_boolean coff_write_alien_symbol
 329   (bfd *, asymbol *, struct internal_syment *, bfd_vma *,
 330    bfd_size_type *, asection **, bfd_size_type *);
 331 extern bfd_boolean coff_write_linenumbers
 332   (bfd *);
 333 extern alent *coff_get_lineno
 334   (bfd *, asymbol *);
 335 extern asymbol *coff_section_symbol
 336   (bfd *, char *);
 337 extern bfd_boolean _bfd_coff_get_external_symbols
 338   (bfd *);
 339 extern const char *_bfd_coff_read_string_table
 340   (bfd *);
 341 extern bfd_boolean _bfd_coff_free_symbols
 342   (bfd *);
 343 extern struct coff_ptr_struct *coff_get_normalized_symtab
 344   (bfd *);
 345 extern long coff_get_reloc_upper_bound
 346   (bfd *, sec_ptr);
 347 extern asymbol *coff_make_empty_symbol
 348   (bfd *);
 349 extern void coff_print_symbol
 350   (bfd *, void * filep, asymbol *, bfd_print_symbol_type);
 351 extern void coff_get_symbol_info
 352   (bfd *, asymbol *, symbol_info *ret);
 353 extern bfd_boolean _bfd_coff_is_local_label_name
 354   (bfd *, const char *);
 355 extern asymbol *coff_bfd_make_debug_symbol
 356   (bfd *, void *, unsigned long);
 357 extern bfd_boolean coff_find_nearest_line
 358   (bfd *, asection *, asymbol **, bfd_vma, const char **,
 359    const char **, unsigned int *);
 360 extern bfd_boolean coff_find_nearest_line_discriminator
 361   (bfd *, asection *, asymbol **, bfd_vma, const char **,
 362    const char **, unsigned int *, unsigned int *);
 363 struct dwarf_debug_section;
 364 extern bfd_boolean coff_find_nearest_line_with_names
 365   (bfd *, const struct dwarf_debug_section *, asection *, asymbol **,
 366    bfd_vma, const char **, const char **, unsigned int *);
 367 extern bfd_boolean coff_find_inliner_info
 368   (bfd *, const char **, const char **, unsigned int *);
 369 extern int coff_sizeof_headers
 370   (bfd *, struct bfd_link_info *);
 371 extern bfd_boolean bfd_coff_reloc16_relax_section
 372   (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
 373 extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents
 374   (bfd *, struct bfd_link_info *, struct bfd_link_order *,
 375    bfd_byte *, bfd_boolean, asymbol **);
 376 extern bfd_vma bfd_coff_reloc16_get_value
 377   (arelent *, struct bfd_link_info *, asection *);
 378 extern void bfd_perform_slip
 379   (bfd *, unsigned int, asection *, bfd_vma);
 380
 381 /* Functions and types in cofflink.c.  */
 382
 383 #define STRING_SIZE_SIZE 4
 384
 385 /* We use a hash table to merge identical enum, struct, and union
 386    definitions in the linker.  */
 387
 388 /* Information we keep for a single element (an enum value, a
 389    structure or union field) in the debug merge hash table.  */
 390
 391 struct coff_debug_merge_element
 392 {
 393   /* Next element.  */
 394   struct coff_debug_merge_element *next;
 395
 396   /* Name.  */
 397   const char *name;
 398
 399   /* Type.  */
 400   unsigned int type;
 401
 402   /* Symbol index for complex type.  */
 403   long tagndx;
 404 };
 405
 406 /* A linked list of debug merge entries for a given name.  */
 407
 408 struct coff_debug_merge_type
 409 {
 410   /* Next type with the same name.  */
 411   struct coff_debug_merge_type *next;
 412
 413   /* Class of type.  */
 414   int type_class;
 415
 416   /* Symbol index where this type is defined.  */
 417   long indx;
 418
 419   /* List of elements.  */
 420   struct coff_debug_merge_element *elements;
 421 };
 422
 423 /* Information we store in the debug merge hash table.  */
 424
 425 struct coff_debug_merge_hash_entry
 426 {
 427   struct bfd_hash_entry root;
 428
 429   /* A list of types with this name.  */
 430   struct coff_debug_merge_type *types;
 431 };
 432
 433 /* The debug merge hash table.  */
 434
 435 struct coff_debug_merge_hash_table
 436 {
 437   struct bfd_hash_table root;
 438 };
 439
 440 /* Initialize a COFF debug merge hash table.  */
 441
 442 #define coff_debug_merge_hash_table_init(table) \
 443   (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \
 444                         sizeof (struct coff_debug_merge_hash_entry)))
 445
 446 /* Free a COFF debug merge hash table.  */
 447
 448 #define coff_debug_merge_hash_table_free(table) \
 449   (bfd_hash_table_free (&(table)->root))
 450
 451 /* Look up an entry in a COFF debug merge hash table.  */
 452
 453 #define coff_debug_merge_hash_lookup(table, string, create, copy) \
 454   ((struct coff_debug_merge_hash_entry *) \
 455    bfd_hash_lookup (&(table)->root, (string), (create), (copy)))
 456
 457 /* Information we keep for each section in the output file when doing
 458    a relocatable link.  */
 459
 460 struct coff_link_section_info
 461 {
 462   /* The relocs to be output.  */
 463   struct internal_reloc *relocs;
 464   /* For each reloc against a global symbol whose index was not known
 465      when the reloc was handled, the global hash table entry.  */
 466   struct coff_link_hash_entry **rel_hashes;
 467 };
 468
 469 /* Information that we pass around while doing the final link step.  */
 470
 471 struct coff_final_link_info
 472 {
 473   /* General link information.  */
 474   struct bfd_link_info *info;
 475   /* Output BFD.  */
 476   bfd *output_bfd;
 477   /* Used to indicate failure in traversal routine.  */
 478   bfd_boolean failed;
 479   /* If doing "task linking" set only during the time when we want the
 480      global symbol writer to convert the storage class of defined global
 481      symbols from global to static. */
 482   bfd_boolean global_to_static;
 483   /* Hash table for long symbol names.  */
 484   struct bfd_strtab_hash *strtab;
 485   /* When doing a relocatable link, an array of information kept for
 486      each output section, indexed by the target_index field.  */
 487   struct coff_link_section_info *section_info;
 488   /* Symbol index of last C_FILE symbol (-1 if none).  */
 489   long last_file_index;
 490   /* Contents of last C_FILE symbol.  */
 491   struct internal_syment last_file;
 492   /* Symbol index of first aux entry of last .bf symbol with an empty
 493      endndx field (-1 if none).  */
 494   long last_bf_index;
 495   /* Contents of last_bf_index aux entry.  */
 496   union internal_auxent last_bf;
 497   /* Hash table used to merge debug information.  */
 498   struct coff_debug_merge_hash_table debug_merge;
 499   /* Buffer large enough to hold swapped symbols of any input file.  */
 500   struct internal_syment *internal_syms;
 501   /* Buffer large enough to hold sections of symbols of any input file.  */
 502   asection **sec_ptrs;
 503   /* Buffer large enough to hold output indices of symbols of any
 504      input file.  */
 505   long *sym_indices;
 506   /* Buffer large enough to hold output symbols for any input file.  */
 507   bfd_byte *outsyms;
 508   /* Buffer large enough to hold external line numbers for any input
 509      section.  */
 510   bfd_byte *linenos;
 511   /* Buffer large enough to hold any input section.  */
 512   bfd_byte *contents;
 513   /* Buffer large enough to hold external relocs of any input section.  */
 514   bfd_byte *external_relocs;
 515   /* Buffer large enough to hold swapped relocs of any input section.  */
 516   struct internal_reloc *internal_relocs;
 517 };
 518
 519 /* Most COFF variants have no way to record the alignment of a
 520    section.  This struct is used to set a specific alignment based on
 521    the name of the section.  */
 522
 523 struct coff_section_alignment_entry
 524 {
 525   /* The section name.  */
 526   const char *name;
 527
 528   /* This is either (unsigned int) -1, indicating that the section
 529      name must match exactly, or it is the number of letters which
 530      must match at the start of the name.  */
 531   unsigned int comparison_length;
 532
 533   /* These macros may be used to fill in the first two fields in a
 534      structure initialization.  */
 535 #define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1)
 536 #define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1)
 537
 538   /* Only use this entry if the default section alignment for this
 539      target is at least that much (as a power of two).  If this field
 540      is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored.  */
 541   unsigned int default_alignment_min;
 542
 543   /* Only use this entry if the default section alignment for this
 544      target is no greater than this (as a power of two).  If this
 545      field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored.  */
 546   unsigned int default_alignment_max;
 547
 548 #define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1)
 549
 550   /* The desired alignment for this section (as a power of two).  */
 551   unsigned int alignment_power;
 552 };
 553
 554 extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc
 555   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 556 extern bfd_boolean _bfd_coff_link_hash_table_init
 557   (struct coff_link_hash_table *, bfd *,
 558    struct bfd_hash_entry *(*) (struct bfd_hash_entry *,
 559                                struct bfd_hash_table *,
 560                                const char *),
 561    unsigned int);
 562 extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create
 563   (bfd *);
 564 extern const char *_bfd_coff_internal_syment_name
 565   (bfd *, const struct internal_syment *, char *);
 566 extern bfd_boolean _bfd_coff_section_already_linked
 567   (bfd *, asection *, struct bfd_link_info *);
 568 extern bfd_boolean _bfd_coff_link_add_symbols
 569   (bfd *, struct bfd_link_info *);
 570 extern bfd_boolean _bfd_coff_final_link
 571   (bfd *, struct bfd_link_info *);
 572 extern struct internal_reloc *_bfd_coff_read_internal_relocs
 573   (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean,
 574    struct internal_reloc *);
 575 extern bfd_boolean _bfd_coff_generic_relocate_section
 576   (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
 577    struct internal_reloc *, struct internal_syment *, asection **);
 578 extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc
 579   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 580 extern bfd_boolean _bfd_coff_write_global_sym
 581   (struct bfd_hash_entry *, void *);
 582 extern bfd_boolean _bfd_coff_write_task_globals
 583   (struct coff_link_hash_entry *, void *);
 584 extern bfd_boolean _bfd_coff_link_input_bfd
 585   (struct coff_final_link_info *, bfd *);
 586 extern bfd_boolean _bfd_coff_reloc_link_order
 587   (bfd *, struct coff_final_link_info *, asection *,
 588    struct bfd_link_order *);
 589
 590
 591 #define coff_get_section_contents_in_window \
 592   _bfd_generic_get_section_contents_in_window
 593
 594 /* Functions in xcofflink.c.  */
 595
 596 extern long _bfd_xcoff_get_dynamic_symtab_upper_bound
 597   (bfd *);
 598 extern long _bfd_xcoff_canonicalize_dynamic_symtab
 599   (bfd *, asymbol **);
 600 extern long _bfd_xcoff_get_dynamic_reloc_upper_bound
 601   (bfd *);
 602 extern long _bfd_xcoff_canonicalize_dynamic_reloc
 603   (bfd *, arelent **, asymbol **);
 604 extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create
 605   (bfd *);
 606 extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols
 607   (bfd *, struct bfd_link_info *);
 608 extern bfd_boolean _bfd_xcoff_bfd_final_link
 609   (bfd *, struct bfd_link_info *);
 610 extern bfd_boolean _bfd_xcoff_define_common_symbol
 611   (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *);
 612 extern bfd_boolean _bfd_ppc_xcoff_relocate_section
 613   (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
 614    struct internal_reloc *, struct internal_syment *, asection **);
 615
 616 /* Functions in coff-ppc.c.  FIXME: These are called by pe.em in the
 617    linker, and so should start with bfd and be declared in bfd.h.  */
 618
 619 extern bfd_boolean ppc_allocate_toc_section
 620   (struct bfd_link_info *);
 621 extern bfd_boolean ppc_process_before_allocation
 622   (bfd *, struct bfd_link_info *);