bfd/libcoff-in.h

   1 /* BFD COFF object file private structure.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
   4    Free Software Foundation, Inc.
   5    Written by Cygnus Support.
   6
   7    This file is part of BFD, the Binary File Descriptor library.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  22    MA 02110-1301, USA.  */
  23
  24 #include "bfdlink.h"
  25
  26 /* Object file tdata; access macros.  */
  27
  28 #define coff_data(bfd)                ((bfd)->tdata.coff_obj_data)
  29 #define exec_hdr(bfd)                 (coff_data (bfd)->hdr)
  30 #define obj_pe(bfd)                   (coff_data (bfd)->pe)
  31 #define obj_symbols(bfd)              (coff_data (bfd)->symbols)
  32 #define obj_sym_filepos(bfd)          (coff_data (bfd)->sym_filepos)
  33 #define obj_relocbase(bfd)            (coff_data (bfd)->relocbase)
  34 #define obj_raw_syments(bfd)          (coff_data (bfd)->raw_syments)
  35 #define obj_raw_syment_count(bfd)     (coff_data (bfd)->raw_syment_count)
  36 #define obj_convert(bfd)              (coff_data (bfd)->conversion_table)
  37 #define obj_conv_table_size(bfd)      (coff_data (bfd)->conv_table_size)
  38 #define obj_coff_external_syms(bfd)   (coff_data (bfd)->external_syms)
  39 #define obj_coff_keep_syms(bfd)       (coff_data (bfd)->keep_syms)
  40 #define obj_coff_strings(bfd)         (coff_data (bfd)->strings)
  41 #define obj_coff_keep_strings(bfd)    (coff_data (bfd)->keep_strings)
  42 #define obj_coff_sym_hashes(bfd)      (coff_data (bfd)->sym_hashes)
  43 #define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written)
  44 #define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map)
  45
  46 /* `Tdata' information kept for COFF files.  */
  47
  48 typedef struct coff_tdata
  49 {
  50   struct coff_symbol_struct *symbols;   /* Symtab for input bfd.  */
  51   unsigned int *conversion_table;
  52   int conv_table_size;
  53   file_ptr sym_filepos;
  54
  55   struct coff_ptr_struct *raw_syments;
  56   unsigned long raw_syment_count;
  57
  58   /* These are only valid once writing has begun.  */
  59   long int relocbase;
  60
  61   /* These members communicate important constants about the symbol table
  62      to GDB's symbol-reading code.  These `constants' unfortunately vary
  63      from coff implementation to implementation...  */
  64   unsigned local_n_btmask;
  65   unsigned local_n_btshft;
  66   unsigned local_n_tmask;
  67   unsigned local_n_tshift;
  68   unsigned local_symesz;
  69   unsigned local_auxesz;
  70   unsigned local_linesz;
  71
  72   /* The unswapped external symbols.  May be NULL.  Read by
  73      _bfd_coff_get_external_symbols.  */
  74   void * external_syms;
  75   /* If this is TRUE, the external_syms may not be freed.  */
  76   bfd_boolean keep_syms;
  77
  78   /* The string table.  May be NULL.  Read by
  79      _bfd_coff_read_string_table.  */
  80   char *strings;
  81   /* If this is TRUE, the strings may not be freed.  */
  82   bfd_boolean keep_strings;
  83   /* If this is TRUE, the strings have been written out already.  */
  84   bfd_boolean strings_written;
  85
  86   /* Is this a PE format coff file?  */
  87   int pe;
  88   /* Used by the COFF backend linker.  */
  89   struct coff_link_hash_entry **sym_hashes;
  90
  91   /* Used by the pe linker for PowerPC.  */
  92   int *local_toc_sym_map;
  93
  94   struct bfd_link_info *link_info;
  95
  96   /* Used by coff_find_nearest_line.  */
  97   void * line_info;
  98
  99   /* A place to stash dwarf2 info for this bfd.  */
 100   void * dwarf2_find_line_info;
 101
 102   /* The timestamp from the COFF file header.  */
 103   long timestamp;
 104
 105   /* Copy of some of the f_flags bits in the COFF filehdr structure,
 106      used by ARM code.  */
 107   flagword flags;
 108
 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   bfd_boolean (*in_reloc_p) (bfd *, reloc_howto_type *);
 119   flagword real_flags;
 120   int target_subsystem;
 121   bfd_boolean force_minimum_alignment;
 122 } pe_data_type;
 123
 124 #define pe_data(bfd)            ((bfd)->tdata.pe_obj_data)
 125
 126 /* Tdata for XCOFF files.  */
 127
 128 struct xcoff_tdata
 129 {
 130   /* Basic COFF information.  */
 131   coff_data_type coff;
 132
 133   /* TRUE if this is an XCOFF64 file. */
 134   bfd_boolean xcoff64;
 135
 136   /* TRUE if a large a.out header should be generated.  */
 137   bfd_boolean full_aouthdr;
 138
 139   /* TOC value.  */
 140   bfd_vma toc;
 141
 142   /* Index of section holding TOC.  */
 143   int sntoc;
 144
 145   /* Index of section holding entry point.  */
 146   int snentry;
 147
 148   /* .text alignment from optional header.  */
 149   int text_align_power;
 150
 151   /* .data alignment from optional header.  */
 152   int data_align_power;
 153
 154   /* modtype from optional header.  */
 155   short modtype;
 156
 157   /* cputype from optional header.  */
 158   short cputype;
 159
 160   /* maxdata from optional header.  */
 161   bfd_vma maxdata;
 162
 163   /* maxstack from optional header.  */
 164   bfd_vma maxstack;
 165
 166   /* Used by the XCOFF backend linker.  */
 167   asection **csects;
 168   unsigned long *debug_indices;
 169   unsigned int import_file_id;
 170 };
 171
 172 #define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data)
 173
 174 /* We take the address of the first element of an asymbol to ensure that the
 175    macro is only ever applied to an asymbol.  */
 176 #define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd)))
 177
 178 /* The used_by_bfd field of a section may be set to a pointer to this
 179    structure.  */
 180
 181 struct coff_section_tdata
 182 {
 183   /* The relocs, swapped into COFF internal form.  This may be NULL.  */
 184   struct internal_reloc *relocs;
 185   /* If this is TRUE, the relocs entry may not be freed.  */
 186   bfd_boolean keep_relocs;
 187   /* The section contents.  This may be NULL.  */
 188   bfd_byte *contents;
 189   /* If this is TRUE, the contents entry may not be freed.  */
 190   bfd_boolean keep_contents;
 191   /* Information cached by coff_find_nearest_line.  */
 192   bfd_vma offset;
 193   unsigned int i;
 194   const char *function;
 195   /* Optional information about a COMDAT entry; NULL if not COMDAT. */
 196   struct coff_comdat_info *comdat;
 197   int line_base;
 198   /* A pointer used for .stab linking optimizations.  */
 199   void * stab_info;
 200   /* Available for individual backends.  */
 201   void * tdata;
 202 };
 203
 204 /* An accessor macro for the coff_section_tdata structure.  */
 205 #define coff_section_data(abfd, sec) \
 206   ((struct coff_section_tdata *) (sec)->used_by_bfd)
 207
 208 /* Tdata for sections in XCOFF files.  This is used by the linker.  */
 209
 210 struct xcoff_section_tdata
 211 {
 212   /* Used for XCOFF csects created by the linker; points to the real
 213      XCOFF section which contains this csect.  */
 214   asection *enclosing;
 215   /* The lineno_count field for the enclosing section, because we are
 216      going to clobber it there.  */
 217   unsigned int lineno_count;
 218   /* The first and one past the last symbol indices for symbols used
 219      by this csect.  */
 220   unsigned long first_symndx;
 221   unsigned long last_symndx;
 222 };
 223
 224 /* An accessor macro the xcoff_section_tdata structure.  */
 225 #define xcoff_section_data(abfd, sec) \
 226   ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
 227
 228 /* Tdata for sections in PE files.  */
 229
 230 struct pei_section_tdata
 231 {
 232   /* The virtual size of the section.  */
 233   bfd_size_type virt_size;
 234   /* The PE section flags.  */
 235   long pe_flags;
 236 };
 237
 238 /* An accessor macro for the pei_section_tdata structure.  */
 239 #define pei_section_data(abfd, sec) \
 240   ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
 241
 242 /* COFF linker hash table entries.  */
 243
 244 struct coff_link_hash_entry
 245 {
 246   struct bfd_link_hash_entry root;
 247
 248   /* Symbol index in output file.  Set to -1 initially.  Set to -2 if
 249      there is a reloc against this symbol.  */
 250   long indx;
 251
 252   /* Symbol type.  */
 253   unsigned short type;
 254
 255   /* Symbol class.  */
 256   unsigned char class;
 257
 258   /* Number of auxiliary entries.  */
 259   char numaux;
 260
 261   /* BFD to take auxiliary entries from.  */
 262   bfd *auxbfd;
 263
 264   /* Pointer to array of auxiliary entries, if any.  */
 265   union internal_auxent *aux;
 266
 267   /* Flag word; legal values follow.  */
 268   unsigned short coff_link_hash_flags;
 269   /* Symbol is a PE section symbol.  */
 270 #define COFF_LINK_HASH_PE_SECTION_SYMBOL (01)
 271 };
 272
 273 /* COFF linker hash table.  */
 274
 275 struct coff_link_hash_table
 276 {
 277   struct bfd_link_hash_table root;
 278   /* A pointer to information used to link stabs in sections.  */
 279   struct stab_info stab_info;
 280 };
 281
 282 /* Look up an entry in a COFF linker hash table.  */
 283
 284 #define coff_link_hash_lookup(table, string, create, copy, follow)      \
 285   ((struct coff_link_hash_entry *)                                      \
 286    bfd_link_hash_lookup (&(table)->root, (string), (create),            \
 287                          (copy), (follow)))
 288
 289 /* Traverse a COFF linker hash table.  */
 290
 291 #define coff_link_hash_traverse(table, func, info)                      \
 292   (bfd_link_hash_traverse                                               \
 293    (&(table)->root,                                                     \
 294     (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
 295     (info)))
 296
 297 /* Get the COFF linker hash table from a link_info structure.  */
 298
 299 #define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash))
 300
 301 /* Functions in coffgen.c.  */
 302 extern const bfd_target *coff_object_p
 303   (bfd *);
 304 extern struct bfd_section *coff_section_from_bfd_index
 305   (bfd *, int);
 306 extern long coff_get_symtab_upper_bound
 307   (bfd *);
 308 extern long coff_canonicalize_symtab
 309   (bfd *, asymbol **);
 310 extern int coff_count_linenumbers
 311   (bfd *);
 312 extern struct coff_symbol_struct *coff_symbol_from
 313   (bfd *, asymbol *);
 314 extern bfd_boolean coff_renumber_symbols
 315   (bfd *, int *);
 316 extern void coff_mangle_symbols
 317   (bfd *);
 318 extern bfd_boolean coff_write_symbols
 319   (bfd *);
 320 extern bfd_boolean coff_write_linenumbers
 321   (bfd *);
 322 extern alent *coff_get_lineno
 323   (bfd *, asymbol *);
 324 extern asymbol *coff_section_symbol
 325   (bfd *, char *);
 326 extern bfd_boolean _bfd_coff_get_external_symbols
 327   (bfd *);
 328 extern const char *_bfd_coff_read_string_table
 329   (bfd *);
 330 extern bfd_boolean _bfd_coff_free_symbols
 331   (bfd *);
 332 extern struct coff_ptr_struct *coff_get_normalized_symtab
 333   (bfd *);
 334 extern long coff_get_reloc_upper_bound
 335   (bfd *, sec_ptr);
 336 extern asymbol *coff_make_empty_symbol
 337   (bfd *);
 338 extern void coff_print_symbol
 339   (bfd *, void * filep, asymbol *, bfd_print_symbol_type);
 340 extern void coff_get_symbol_info
 341   (bfd *, asymbol *, symbol_info *ret);
 342 extern bfd_boolean _bfd_coff_is_local_label_name
 343   (bfd *, const char *);
 344 extern asymbol *coff_bfd_make_debug_symbol
 345   (bfd *, void *, unsigned long);
 346 extern bfd_boolean coff_find_nearest_line
 347   (bfd *, asection *, asymbol **, bfd_vma, const char **,
 348    const char **, unsigned int *);
 349 extern bfd_boolean coff_find_inliner_info
 350   (bfd *, const char **, const char **, unsigned int *);
 351 extern int coff_sizeof_headers
 352   (bfd *, struct bfd_link_info *);
 353 extern bfd_boolean bfd_coff_reloc16_relax_section
 354   (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
 355 extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents
 356   (bfd *, struct bfd_link_info *, struct bfd_link_order *,
 357    bfd_byte *, bfd_boolean, asymbol **);
 358 extern bfd_vma bfd_coff_reloc16_get_value
 359   (arelent *, struct bfd_link_info *, asection *);
 360 extern void bfd_perform_slip
 361   (bfd *, unsigned int, asection *, bfd_vma);
 362
 363 /* Functions and types in cofflink.c.  */
 364
 365 #define STRING_SIZE_SIZE 4
 366
 367 /* We use a hash table to merge identical enum, struct, and union
 368    definitions in the linker.  */
 369
 370 /* Information we keep for a single element (an enum value, a
 371    structure or union field) in the debug merge hash table.  */
 372
 373 struct coff_debug_merge_element
 374 {
 375   /* Next element.  */
 376   struct coff_debug_merge_element *next;
 377
 378   /* Name.  */
 379   const char *name;
 380
 381   /* Type.  */
 382   unsigned int type;
 383
 384   /* Symbol index for complex type.  */
 385   long tagndx;
 386 };
 387
 388 /* A linked list of debug merge entries for a given name.  */
 389
 390 struct coff_debug_merge_type
 391 {
 392   /* Next type with the same name.  */
 393   struct coff_debug_merge_type *next;
 394
 395   /* Class of type.  */
 396   int class;
 397
 398   /* Symbol index where this type is defined.  */
 399   long indx;
 400
 401   /* List of elements.  */
 402   struct coff_debug_merge_element *elements;
 403 };
 404
 405 /* Information we store in the debug merge hash table.  */
 406
 407 struct coff_debug_merge_hash_entry
 408 {
 409   struct bfd_hash_entry root;
 410
 411   /* A list of types with this name.  */
 412   struct coff_debug_merge_type *types;
 413 };
 414
 415 /* The debug merge hash table.  */
 416
 417 struct coff_debug_merge_hash_table
 418 {
 419   struct bfd_hash_table root;
 420 };
 421
 422 /* Initialize a COFF debug merge hash table.  */
 423
 424 #define coff_debug_merge_hash_table_init(table) \
 425   (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \
 426                         sizeof (struct coff_debug_merge_hash_entry)))
 427
 428 /* Free a COFF debug merge hash table.  */
 429
 430 #define coff_debug_merge_hash_table_free(table) \
 431   (bfd_hash_table_free (&(table)->root))
 432
 433 /* Look up an entry in a COFF debug merge hash table.  */
 434
 435 #define coff_debug_merge_hash_lookup(table, string, create, copy) \
 436   ((struct coff_debug_merge_hash_entry *) \
 437    bfd_hash_lookup (&(table)->root, (string), (create), (copy)))
 438
 439 /* Information we keep for each section in the output file when doing
 440    a relocatable link.  */
 441
 442 struct coff_link_section_info
 443 {
 444   /* The relocs to be output.  */
 445   struct internal_reloc *relocs;
 446   /* For each reloc against a global symbol whose index was not known
 447      when the reloc was handled, the global hash table entry.  */
 448   struct coff_link_hash_entry **rel_hashes;
 449 };
 450
 451 /* Information that we pass around while doing the final link step.  */
 452
 453 struct coff_final_link_info
 454 {
 455   /* General link information.  */
 456   struct bfd_link_info *info;
 457   /* Output BFD.  */
 458   bfd *output_bfd;
 459   /* Used to indicate failure in traversal routine.  */
 460   bfd_boolean failed;
 461   /* If doing "task linking" set only during the time when we want the
 462      global symbol writer to convert the storage class of defined global
 463      symbols from global to static. */
 464   bfd_boolean global_to_static;
 465   /* Hash table for long symbol names.  */
 466   struct bfd_strtab_hash *strtab;
 467   /* When doing a relocatable link, an array of information kept for
 468      each output section, indexed by the target_index field.  */
 469   struct coff_link_section_info *section_info;
 470   /* Symbol index of last C_FILE symbol (-1 if none).  */
 471   long last_file_index;
 472   /* Contents of last C_FILE symbol.  */
 473   struct internal_syment last_file;
 474   /* Symbol index of first aux entry of last .bf symbol with an empty
 475      endndx field (-1 if none).  */
 476   long last_bf_index;
 477   /* Contents of last_bf_index aux entry.  */
 478   union internal_auxent last_bf;
 479   /* Hash table used to merge debug information.  */
 480   struct coff_debug_merge_hash_table debug_merge;
 481   /* Buffer large enough to hold swapped symbols of any input file.  */
 482   struct internal_syment *internal_syms;
 483   /* Buffer large enough to hold sections of symbols of any input file.  */
 484   asection **sec_ptrs;
 485   /* Buffer large enough to hold output indices of symbols of any
 486      input file.  */
 487   long *sym_indices;
 488   /* Buffer large enough to hold output symbols for any input file.  */
 489   bfd_byte *outsyms;
 490   /* Buffer large enough to hold external line numbers for any input
 491      section.  */
 492   bfd_byte *linenos;
 493   /* Buffer large enough to hold any input section.  */
 494   bfd_byte *contents;
 495   /* Buffer large enough to hold external relocs of any input section.  */
 496   bfd_byte *external_relocs;
 497   /* Buffer large enough to hold swapped relocs of any input section.  */
 498   struct internal_reloc *internal_relocs;
 499 };
 500
 501 /* Most COFF variants have no way to record the alignment of a
 502    section.  This struct is used to set a specific alignment based on
 503    the name of the section.  */
 504
 505 struct coff_section_alignment_entry
 506 {
 507   /* The section name.  */
 508   const char *name;
 509
 510   /* This is either (unsigned int) -1, indicating that the section
 511      name must match exactly, or it is the number of letters which
 512      must match at the start of the name.  */
 513   unsigned int comparison_length;
 514
 515   /* These macros may be used to fill in the first two fields in a
 516      structure initialization.  */
 517 #define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1)
 518 #define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1)
 519
 520   /* Only use this entry if the default section alignment for this
 521      target is at least that much (as a power of two).  If this field
 522      is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored.  */
 523   unsigned int default_alignment_min;
 524
 525   /* Only use this entry if the default section alignment for this
 526      target is no greater than this (as a power of two).  If this
 527      field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored.  */
 528   unsigned int default_alignment_max;
 529
 530 #define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1)
 531
 532   /* The desired alignment for this section (as a power of two).  */
 533   unsigned int alignment_power;
 534 };
 535
 536 extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc
 537   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 538 extern bfd_boolean _bfd_coff_link_hash_table_init
 539   (struct coff_link_hash_table *, bfd *,
 540    struct bfd_hash_entry *(*) (struct bfd_hash_entry *,
 541                                struct bfd_hash_table *,
 542                                const char *),
 543    unsigned int);
 544 extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create
 545   (bfd *);
 546 extern const char *_bfd_coff_internal_syment_name
 547   (bfd *, const struct internal_syment *, char *);
 548 extern bfd_boolean _bfd_coff_link_add_symbols
 549   (bfd *, struct bfd_link_info *);
 550 extern bfd_boolean _bfd_coff_final_link
 551   (bfd *, struct bfd_link_info *);
 552 extern struct internal_reloc *_bfd_coff_read_internal_relocs
 553   (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean,
 554    struct internal_reloc *);
 555 extern bfd_boolean _bfd_coff_generic_relocate_section
 556   (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
 557    struct internal_reloc *, struct internal_syment *, asection **);
 558 extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc
 559   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 560 extern bfd_boolean _bfd_coff_write_global_sym
 561   (struct coff_link_hash_entry *, void *);
 562 extern bfd_boolean _bfd_coff_write_task_globals
 563   (struct coff_link_hash_entry *, void *);
 564 extern bfd_boolean _bfd_coff_link_input_bfd
 565   (struct coff_final_link_info *, bfd *);
 566 extern bfd_boolean _bfd_coff_reloc_link_order
 567   (bfd *, struct coff_final_link_info *, asection *,
 568    struct bfd_link_order *);
 569
 570
 571 #define coff_get_section_contents_in_window \
 572   _bfd_generic_get_section_contents_in_window
 573
 574 /* Functions in xcofflink.c.  */
 575
 576 extern long _bfd_xcoff_get_dynamic_symtab_upper_bound
 577   (bfd *);
 578 extern long _bfd_xcoff_canonicalize_dynamic_symtab
 579   (bfd *, asymbol **);
 580 extern long _bfd_xcoff_get_dynamic_reloc_upper_bound
 581   (bfd *);
 582 extern long _bfd_xcoff_canonicalize_dynamic_reloc
 583   (bfd *, arelent **, asymbol **);
 584 extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create
 585   (bfd *);
 586 extern void _bfd_xcoff_bfd_link_hash_table_free
 587   (struct bfd_link_hash_table *);
 588 extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols
 589   (bfd *, struct bfd_link_info *);
 590 extern bfd_boolean _bfd_xcoff_bfd_final_link
 591   (bfd *, struct bfd_link_info *);
 592 extern bfd_boolean _bfd_ppc_xcoff_relocate_section
 593   (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
 594    struct internal_reloc *, struct internal_syment *, asection **);
 595
 596 /* Functions in coff-ppc.c.  FIXME: These are called be pe.em in the
 597    linker, and so should start with bfd and be declared in bfd.h.  */
 598
 599 extern bfd_boolean ppc_allocate_toc_section
 600   (struct bfd_link_info *);
 601 extern bfd_boolean ppc_process_before_allocation
 602   (bfd *, struct bfd_link_info *);
 603