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, 2009
   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 last symbol indices for symbols used by this csect.  */
 219   unsigned long first_symndx;
 220   unsigned long last_symndx;
 221 };
 222
 223 /* An accessor macro the xcoff_section_tdata structure.  */
 224 #define xcoff_section_data(abfd, sec) \
 225   ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
 226
 227 /* Tdata for sections in PE files.  */
 228
 229 struct pei_section_tdata
 230 {
 231   /* The virtual size of the section.  */
 232   bfd_size_type virt_size;
 233   /* The PE section flags.  */
 234   long pe_flags;
 235 };
 236
 237 /* An accessor macro for the pei_section_tdata structure.  */
 238 #define pei_section_data(abfd, sec) \
 239   ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
 240
 241 /* COFF linker hash table entries.  */
 242
 243 struct coff_link_hash_entry
 244 {
 245   struct bfd_link_hash_entry root;
 246
 247   /* Symbol index in output file.  Set to -1 initially.  Set to -2 if
 248      there is a reloc against this symbol.  */
 249   long indx;
 250
 251   /* Symbol type.  */
 252   unsigned short type;
 253
 254   /* Symbol class.  */
 255   unsigned char class;
 256
 257   /* Number of auxiliary entries.  */
 258   char numaux;
 259
 260   /* BFD to take auxiliary entries from.  */
 261   bfd *auxbfd;
 262
 263   /* Pointer to array of auxiliary entries, if any.  */
 264   union internal_auxent *aux;
 265
 266   /* Flag word; legal values follow.  */
 267   unsigned short coff_link_hash_flags;
 268   /* Symbol is a PE section symbol.  */
 269 #define COFF_LINK_HASH_PE_SECTION_SYMBOL (01)
 270 };
 271
 272 /* COFF linker hash table.  */
 273
 274 struct coff_link_hash_table
 275 {
 276   struct bfd_link_hash_table root;
 277   /* A pointer to information used to link stabs in sections.  */
 278   struct stab_info stab_info;
 279 };
 280
 281 /* Look up an entry in a COFF linker hash table.  */
 282
 283 #define coff_link_hash_lookup(table, string, create, copy, follow)      \
 284   ((struct coff_link_hash_entry *)                                      \
 285    bfd_link_hash_lookup (&(table)->root, (string), (create),            \
 286                          (copy), (follow)))
 287
 288 /* Traverse a COFF linker hash table.  */
 289
 290 #define coff_link_hash_traverse(table, func, info)                      \
 291   (bfd_link_hash_traverse                                               \
 292    (&(table)->root,                                                     \
 293     (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
 294     (info)))
 295
 296 /* Get the COFF linker hash table from a link_info structure.  */
 297
 298 #define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash))
 299
 300 /* Functions in coffgen.c.  */
 301 extern const bfd_target *coff_object_p
 302   (bfd *);
 303 extern struct bfd_section *coff_section_from_bfd_index
 304   (bfd *, int);
 305 extern long coff_get_symtab_upper_bound
 306   (bfd *);
 307 extern long coff_canonicalize_symtab
 308   (bfd *, asymbol **);
 309 extern int coff_count_linenumbers
 310   (bfd *);
 311 extern struct coff_symbol_struct *coff_symbol_from
 312   (bfd *, asymbol *);
 313 extern bfd_boolean coff_renumber_symbols
 314   (bfd *, int *);
 315 extern void coff_mangle_symbols
 316   (bfd *);
 317 extern bfd_boolean coff_write_symbols
 318   (bfd *);
 319 extern bfd_boolean coff_write_linenumbers
 320   (bfd *);
 321 extern alent *coff_get_lineno
 322   (bfd *, asymbol *);
 323 extern asymbol *coff_section_symbol
 324   (bfd *, char *);
 325 extern bfd_boolean _bfd_coff_get_external_symbols
 326   (bfd *);
 327 extern const char *_bfd_coff_read_string_table
 328   (bfd *);
 329 extern bfd_boolean _bfd_coff_free_symbols
 330   (bfd *);
 331 extern struct coff_ptr_struct *coff_get_normalized_symtab
 332   (bfd *);
 333 extern long coff_get_reloc_upper_bound
 334   (bfd *, sec_ptr);
 335 extern asymbol *coff_make_empty_symbol
 336   (bfd *);
 337 extern void coff_print_symbol
 338   (bfd *, void * filep, asymbol *, bfd_print_symbol_type);
 339 extern void coff_get_symbol_info
 340   (bfd *, asymbol *, symbol_info *ret);
 341 extern bfd_boolean _bfd_coff_is_local_label_name
 342   (bfd *, const char *);
 343 extern asymbol *coff_bfd_make_debug_symbol
 344   (bfd *, void *, unsigned long);
 345 extern bfd_boolean coff_find_nearest_line
 346   (bfd *, asection *, asymbol **, bfd_vma, const char **,
 347    const char **, unsigned int *);
 348 extern bfd_boolean coff_find_inliner_info
 349   (bfd *, const char **, const char **, unsigned int *);
 350 extern int coff_sizeof_headers
 351   (bfd *, struct bfd_link_info *);
 352 extern bfd_boolean bfd_coff_reloc16_relax_section
 353   (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
 354 extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents
 355   (bfd *, struct bfd_link_info *, struct bfd_link_order *,
 356    bfd_byte *, bfd_boolean, asymbol **);
 357 extern bfd_vma bfd_coff_reloc16_get_value
 358   (arelent *, struct bfd_link_info *, asection *);
 359 extern void bfd_perform_slip
 360   (bfd *, unsigned int, asection *, bfd_vma);
 361
 362 /* Functions and types in cofflink.c.  */
 363
 364 #define STRING_SIZE_SIZE 4
 365
 366 /* We use a hash table to merge identical enum, struct, and union
 367    definitions in the linker.  */
 368
 369 /* Information we keep for a single element (an enum value, a
 370    structure or union field) in the debug merge hash table.  */
 371
 372 struct coff_debug_merge_element
 373 {
 374   /* Next element.  */
 375   struct coff_debug_merge_element *next;
 376
 377   /* Name.  */
 378   const char *name;
 379
 380   /* Type.  */
 381   unsigned int type;
 382
 383   /* Symbol index for complex type.  */
 384   long tagndx;
 385 };
 386
 387 /* A linked list of debug merge entries for a given name.  */
 388
 389 struct coff_debug_merge_type
 390 {
 391   /* Next type with the same name.  */
 392   struct coff_debug_merge_type *next;
 393
 394   /* Class of type.  */
 395   int class;
 396
 397   /* Symbol index where this type is defined.  */
 398   long indx;
 399
 400   /* List of elements.  */
 401   struct coff_debug_merge_element *elements;
 402 };
 403
 404 /* Information we store in the debug merge hash table.  */
 405
 406 struct coff_debug_merge_hash_entry
 407 {
 408   struct bfd_hash_entry root;
 409
 410   /* A list of types with this name.  */
 411   struct coff_debug_merge_type *types;
 412 };
 413
 414 /* The debug merge hash table.  */
 415
 416 struct coff_debug_merge_hash_table
 417 {
 418   struct bfd_hash_table root;
 419 };
 420
 421 /* Initialize a COFF debug merge hash table.  */
 422
 423 #define coff_debug_merge_hash_table_init(table) \
 424   (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \
 425                         sizeof (struct coff_debug_merge_hash_entry)))
 426
 427 /* Free a COFF debug merge hash table.  */
 428
 429 #define coff_debug_merge_hash_table_free(table) \
 430   (bfd_hash_table_free (&(table)->root))
 431
 432 /* Look up an entry in a COFF debug merge hash table.  */
 433
 434 #define coff_debug_merge_hash_lookup(table, string, create, copy) \
 435   ((struct coff_debug_merge_hash_entry *) \
 436    bfd_hash_lookup (&(table)->root, (string), (create), (copy)))
 437
 438 /* Information we keep for each section in the output file when doing
 439    a relocatable link.  */
 440
 441 struct coff_link_section_info
 442 {
 443   /* The relocs to be output.  */
 444   struct internal_reloc *relocs;
 445   /* For each reloc against a global symbol whose index was not known
 446      when the reloc was handled, the global hash table entry.  */
 447   struct coff_link_hash_entry **rel_hashes;
 448 };
 449
 450 /* Information that we pass around while doing the final link step.  */
 451
 452 struct coff_final_link_info
 453 {
 454   /* General link information.  */
 455   struct bfd_link_info *info;
 456   /* Output BFD.  */
 457   bfd *output_bfd;
 458   /* Used to indicate failure in traversal routine.  */
 459   bfd_boolean failed;
 460   /* If doing "task linking" set only during the time when we want the
 461      global symbol writer to convert the storage class of defined global
 462      symbols from global to static. */
 463   bfd_boolean global_to_static;
 464   /* Hash table for long symbol names.  */
 465   struct bfd_strtab_hash *strtab;
 466   /* When doing a relocatable link, an array of information kept for
 467      each output section, indexed by the target_index field.  */
 468   struct coff_link_section_info *section_info;
 469   /* Symbol index of last C_FILE symbol (-1 if none).  */
 470   long last_file_index;
 471   /* Contents of last C_FILE symbol.  */
 472   struct internal_syment last_file;
 473   /* Symbol index of first aux entry of last .bf symbol with an empty
 474      endndx field (-1 if none).  */
 475   long last_bf_index;
 476   /* Contents of last_bf_index aux entry.  */
 477   union internal_auxent last_bf;
 478   /* Hash table used to merge debug information.  */
 479   struct coff_debug_merge_hash_table debug_merge;
 480   /* Buffer large enough to hold swapped symbols of any input file.  */
 481   struct internal_syment *internal_syms;
 482   /* Buffer large enough to hold sections of symbols of any input file.  */
 483   asection **sec_ptrs;
 484   /* Buffer large enough to hold output indices of symbols of any
 485      input file.  */
 486   long *sym_indices;
 487   /* Buffer large enough to hold output symbols for any input file.  */
 488   bfd_byte *outsyms;
 489   /* Buffer large enough to hold external line numbers for any input
 490      section.  */
 491   bfd_byte *linenos;
 492   /* Buffer large enough to hold any input section.  */
 493   bfd_byte *contents;
 494   /* Buffer large enough to hold external relocs of any input section.  */
 495   bfd_byte *external_relocs;
 496   /* Buffer large enough to hold swapped relocs of any input section.  */
 497   struct internal_reloc *internal_relocs;
 498 };
 499
 500 /* Most COFF variants have no way to record the alignment of a
 501    section.  This struct is used to set a specific alignment based on
 502    the name of the section.  */
 503
 504 struct coff_section_alignment_entry
 505 {
 506   /* The section name.  */
 507   const char *name;
 508
 509   /* This is either (unsigned int) -1, indicating that the section
 510      name must match exactly, or it is the number of letters which
 511      must match at the start of the name.  */
 512   unsigned int comparison_length;
 513
 514   /* These macros may be used to fill in the first two fields in a
 515      structure initialization.  */
 516 #define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1)
 517 #define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1)
 518
 519   /* Only use this entry if the default section alignment for this
 520      target is at least that much (as a power of two).  If this field
 521      is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored.  */
 522   unsigned int default_alignment_min;
 523
 524   /* Only use this entry if the default section alignment for this
 525      target is no greater than this (as a power of two).  If this
 526      field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored.  */
 527   unsigned int default_alignment_max;
 528
 529 #define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1)
 530
 531   /* The desired alignment for this section (as a power of two).  */
 532   unsigned int alignment_power;
 533 };
 534
 535 extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc
 536   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 537 extern bfd_boolean _bfd_coff_link_hash_table_init
 538   (struct coff_link_hash_table *, bfd *,
 539    struct bfd_hash_entry *(*) (struct bfd_hash_entry *,
 540                                struct bfd_hash_table *,
 541                                const char *),
 542    unsigned int);
 543 extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create
 544   (bfd *);
 545 extern const char *_bfd_coff_internal_syment_name
 546   (bfd *, const struct internal_syment *, char *);
 547 extern bfd_boolean _bfd_coff_link_add_symbols
 548   (bfd *, struct bfd_link_info *);
 549 extern bfd_boolean _bfd_coff_final_link
 550   (bfd *, struct bfd_link_info *);
 551 extern struct internal_reloc *_bfd_coff_read_internal_relocs
 552   (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean,
 553    struct internal_reloc *);
 554 extern bfd_boolean _bfd_coff_generic_relocate_section
 555   (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
 556    struct internal_reloc *, struct internal_syment *, asection **);
 557 extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc
 558   (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
 559 extern bfd_boolean _bfd_coff_write_global_sym
 560   (struct coff_link_hash_entry *, void *);
 561 extern bfd_boolean _bfd_coff_write_task_globals
 562   (struct coff_link_hash_entry *, void *);
 563 extern bfd_boolean _bfd_coff_link_input_bfd
 564   (struct coff_final_link_info *, bfd *);
 565 extern bfd_boolean _bfd_coff_reloc_link_order
 566   (bfd *, struct coff_final_link_info *, asection *,
 567    struct bfd_link_order *);
 568
 569
 570 #define coff_get_section_contents_in_window \
 571   _bfd_generic_get_section_contents_in_window
 572
 573 /* Functions in xcofflink.c.  */
 574
 575 extern long _bfd_xcoff_get_dynamic_symtab_upper_bound
 576   (bfd *);
 577 extern long _bfd_xcoff_canonicalize_dynamic_symtab
 578   (bfd *, asymbol **);
 579 extern long _bfd_xcoff_get_dynamic_reloc_upper_bound
 580   (bfd *);
 581 extern long _bfd_xcoff_canonicalize_dynamic_reloc
 582   (bfd *, arelent **, asymbol **);
 583 extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create
 584   (bfd *);
 585 extern void _bfd_xcoff_bfd_link_hash_table_free
 586   (struct bfd_link_hash_table *);
 587 extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols
 588   (bfd *, struct bfd_link_info *);
 589 extern bfd_boolean _bfd_xcoff_bfd_final_link
 590   (bfd *, struct bfd_link_info *);
 591 extern bfd_boolean _bfd_ppc_xcoff_relocate_section
 592   (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
 593    struct internal_reloc *, struct internal_syment *, asection **);
 594
 595 /* Functions in coff-ppc.c.  FIXME: These are called by pe.em in the
 596    linker, and so should start with bfd and be declared in bfd.h.  */
 597
 598 extern bfd_boolean ppc_allocate_toc_section
 599   (struct bfd_link_info *);
 600 extern bfd_boolean ppc_process_before_allocation
 601   (bfd *, struct bfd_link_info *);
 602