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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [include/] [bfdlink.h] - Blame information for rev 227

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1 227 jeremybenn
/* bfdlink.h -- header file for BFD link routines
2
   Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3
   2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
4
   Written by Steve Chamberlain and Ian Lance Taylor, 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 3 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,
21
   MA 02110-1301, USA.  */
22
 
23
#ifndef BFDLINK_H
24
#define BFDLINK_H
25
 
26
/* Which symbols to strip during a link.  */
27
enum bfd_link_strip
28
{
29
  strip_none,           /* Don't strip any symbols.  */
30
  strip_debugger,       /* Strip debugging symbols.  */
31
  strip_some,           /* keep_hash is the list of symbols to keep.  */
32
  strip_all             /* Strip all symbols.  */
33
};
34
 
35
/* Which local symbols to discard during a link.  This is irrelevant
36
   if strip_all is used.  */
37
enum bfd_link_discard
38
{
39
  discard_sec_merge,    /* Discard local temporary symbols in SEC_MERGE
40
                           sections.  */
41
  discard_none,         /* Don't discard any locals.  */
42
  discard_l,            /* Discard local temporary symbols.  */
43
  discard_all           /* Discard all locals.  */
44
};
45
 
46
/* Describes the type of hash table entry structure being used.
47
   Different hash table structure have different fields and so
48
   support different linking features.  */
49
enum bfd_link_hash_table_type
50
  {
51
    bfd_link_generic_hash_table,
52
    bfd_link_elf_hash_table
53
  };
54
 
55
/* These are the possible types of an entry in the BFD link hash
56
   table.  */
57
 
58
enum bfd_link_hash_type
59
{
60
  bfd_link_hash_new,            /* Symbol is new.  */
61
  bfd_link_hash_undefined,      /* Symbol seen before, but undefined.  */
62
  bfd_link_hash_undefweak,      /* Symbol is weak and undefined.  */
63
  bfd_link_hash_defined,        /* Symbol is defined.  */
64
  bfd_link_hash_defweak,        /* Symbol is weak and defined.  */
65
  bfd_link_hash_common,         /* Symbol is common.  */
66
  bfd_link_hash_indirect,       /* Symbol is an indirect link.  */
67
  bfd_link_hash_warning         /* Like indirect, but warn if referenced.  */
68
};
69
 
70
enum bfd_link_common_skip_ar_symbols
71
{
72
  bfd_link_common_skip_none,
73
  bfd_link_common_skip_text,
74
  bfd_link_common_skip_data,
75
  bfd_link_common_skip_all
76
};
77
 
78
struct bfd_link_hash_common_entry
79
  {
80
    unsigned int alignment_power;       /* Alignment.  */
81
    asection *section;          /* Symbol section.  */
82
  };
83
 
84
/* The linking routines use a hash table which uses this structure for
85
   its elements.  */
86
 
87
struct bfd_link_hash_entry
88
{
89
  /* Base hash table entry structure.  */
90
  struct bfd_hash_entry root;
91
 
92
  /* Type of this entry.  */
93
  enum bfd_link_hash_type type;
94
 
95
  /* A union of information depending upon the type.  */
96
  union
97
    {
98
      /* Nothing is kept for bfd_hash_new.  */
99
      /* bfd_link_hash_undefined, bfd_link_hash_undefweak.  */
100
      struct
101
        {
102
          /* Undefined and common symbols are kept in a linked list through
103
             this field.  This field is present in all of the union element
104
             so that we don't need to remove entries from the list when we
105
             change their type.  Removing entries would either require the
106
             list to be doubly linked, which would waste more memory, or
107
             require a traversal.  When an undefined or common symbol is
108
             created, it should be added to this list, the head of which is in
109
             the link hash table itself.  As symbols are defined, they need
110
             not be removed from the list; anything which reads the list must
111
             doublecheck the symbol type.
112
 
113
             Weak symbols are not kept on this list.
114
 
115
             Defined and defweak symbols use this field as a reference marker.
116
             If the field is not NULL, or this structure is the tail of the
117
             undefined symbol list, the symbol has been referenced.  If the
118
             symbol is undefined and becomes defined, this field will
119
             automatically be non-NULL since the symbol will have been on the
120
             undefined symbol list.  */
121
          struct bfd_link_hash_entry *next;
122
          bfd *abfd;            /* BFD symbol was found in.  */
123
          bfd *weak;            /* BFD weak symbol was found in.  */
124
        } undef;
125
      /* bfd_link_hash_defined, bfd_link_hash_defweak.  */
126
      struct
127
        {
128
          struct bfd_link_hash_entry *next;
129
          asection *section;    /* Symbol section.  */
130
          bfd_vma value;        /* Symbol value.  */
131
        } def;
132
      /* bfd_link_hash_indirect, bfd_link_hash_warning.  */
133
      struct
134
        {
135
          struct bfd_link_hash_entry *next;
136
          struct bfd_link_hash_entry *link;     /* Real symbol.  */
137
          const char *warning;  /* Warning (bfd_link_hash_warning only).  */
138
        } i;
139
      /* bfd_link_hash_common.  */
140
      struct
141
        {
142
          struct bfd_link_hash_entry *next;
143
          /* The linker needs to know three things about common
144
             symbols: the size, the alignment, and the section in
145
             which the symbol should be placed.  We store the size
146
             here, and we allocate a small structure to hold the
147
             section and the alignment.  The alignment is stored as a
148
             power of two.  We don't store all the information
149
             directly because we don't want to increase the size of
150
             the union; this structure is a major space user in the
151
             linker.  */
152
          struct bfd_link_hash_common_entry *p;
153
          bfd_size_type size;   /* Common symbol size.  */
154
        } c;
155
    } u;
156
};
157
 
158
/* This is the link hash table.  It is a derived class of
159
   bfd_hash_table.  */
160
 
161
struct bfd_link_hash_table
162
{
163
  /* The hash table itself.  */
164
  struct bfd_hash_table table;
165
  /* A linked list of undefined and common symbols, linked through the
166
     next field in the bfd_link_hash_entry structure.  */
167
  struct bfd_link_hash_entry *undefs;
168
  /* Entries are added to the tail of the undefs list.  */
169
  struct bfd_link_hash_entry *undefs_tail;
170
  /* The type of the link hash table.  */
171
  enum bfd_link_hash_table_type type;
172
};
173
 
174
/* Look up an entry in a link hash table.  If FOLLOW is TRUE, this
175
   follows bfd_link_hash_indirect and bfd_link_hash_warning links to
176
   the real symbol.  */
177
extern struct bfd_link_hash_entry *bfd_link_hash_lookup
178
  (struct bfd_link_hash_table *, const char *, bfd_boolean create,
179
   bfd_boolean copy, bfd_boolean follow);
180
 
181
/* Look up an entry in the main linker hash table if the symbol might
182
   be wrapped.  This should only be used for references to an
183
   undefined symbol, not for definitions of a symbol.  */
184
 
185
extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup
186
  (bfd *, struct bfd_link_info *, const char *, bfd_boolean,
187
   bfd_boolean, bfd_boolean);
188
 
189
/* Traverse a link hash table.  */
190
extern void bfd_link_hash_traverse
191
  (struct bfd_link_hash_table *,
192
    bfd_boolean (*) (struct bfd_link_hash_entry *, void *),
193
    void *);
194
 
195
/* Add an entry to the undefs list.  */
196
extern void bfd_link_add_undef
197
  (struct bfd_link_hash_table *, struct bfd_link_hash_entry *);
198
 
199
/* Remove symbols from the undefs list that don't belong there.  */
200
extern void bfd_link_repair_undef_list
201
  (struct bfd_link_hash_table *table);
202
 
203
/* Read symbols and cache symbol pointer array in outsymbols.  */
204
extern bfd_boolean bfd_generic_link_read_symbols (bfd *);
205
 
206
struct bfd_sym_chain
207
{
208
  struct bfd_sym_chain *next;
209
  const char *name;
210
};
211
 
212
/* How to handle unresolved symbols.
213
   There are four possibilities which are enumerated below:  */
214
enum report_method
215
{
216
  /* This is the initial value when then link_info structure is created.
217
     It allows the various stages of the linker to determine whether they
218
     allowed to set the value.  */
219
  RM_NOT_YET_SET = 0,
220
  RM_IGNORE,
221
  RM_GENERATE_WARNING,
222
  RM_GENERATE_ERROR
223
};
224
 
225
struct bfd_elf_dynamic_list;
226
 
227
/* This structure holds all the information needed to communicate
228
   between BFD and the linker when doing a link.  */
229
 
230
struct bfd_link_info
231
{
232
  /* TRUE if BFD should generate a relocatable object file.  */
233
  unsigned int relocatable: 1;
234
 
235
  /* TRUE if BFD should generate relocation information in the final
236
     executable.  */
237
  unsigned int emitrelocations: 1;
238
 
239
  /* TRUE if BFD should generate a "task linked" object file,
240
     similar to relocatable but also with globals converted to
241
     statics.  */
242
  unsigned int task_link: 1;
243
 
244
  /* TRUE if BFD should generate a shared object.  */
245
  unsigned int shared: 1;
246
 
247
  /* TRUE if BFD should pre-bind symbols in a shared object.  */
248
  unsigned int symbolic: 1;
249
 
250
  /* TRUE if BFD should export all symbols in the dynamic symbol table
251
     of an executable, rather than only those used.  */
252
  unsigned int export_dynamic: 1;
253
 
254
  /* TRUE if shared objects should be linked directly, not shared.  */
255
  unsigned int static_link: 1;
256
 
257
  /* TRUE if the output file should be in a traditional format.  This
258
     is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag
259
     on the output file, but may be checked when reading the input
260
     files.  */
261
  unsigned int traditional_format: 1;
262
 
263
  /* TRUE if we want to produced optimized output files.  This might
264
     need much more time and therefore must be explicitly selected.  */
265
  unsigned int optimize: 1;
266
 
267
  /* TRUE if ok to have multiple definition.  */
268
  unsigned int allow_multiple_definition: 1;
269
 
270
  /* TRUE if ok to have version with no definition.  */
271
  unsigned int allow_undefined_version: 1;
272
 
273
  /* TRUE if a default symbol version should be created and used for
274
     exported symbols.  */
275
  unsigned int create_default_symver: 1;
276
 
277
  /* TRUE if a default symbol version should be created and used for
278
     imported symbols.  */
279
  unsigned int default_imported_symver: 1;
280
 
281
  /* TRUE if symbols should be retained in memory, FALSE if they
282
     should be freed and reread.  */
283
  unsigned int keep_memory: 1;
284
 
285
  /* TRUE if every symbol should be reported back via the notice
286
     callback.  */
287
  unsigned int notice_all: 1;
288
 
289
  /* TRUE if executable should not contain copy relocs.
290
     Setting this true may result in a non-sharable text segment.  */
291
  unsigned int nocopyreloc: 1;
292
 
293
  /* TRUE if the new ELF dynamic tags are enabled. */
294
  unsigned int new_dtags: 1;
295
 
296
  /* TRUE if non-PLT relocs should be merged into one reloc section
297
     and sorted so that relocs against the same symbol come together.  */
298
  unsigned int combreloc: 1;
299
 
300
  /* TRUE if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment
301
     should be created.  */
302
  unsigned int eh_frame_hdr: 1;
303
 
304
  /* TRUE if global symbols in discarded sections should be stripped.  */
305
  unsigned int strip_discarded: 1;
306
 
307
  /* TRUE if generating a position independent executable.  */
308
  unsigned int pie: 1;
309
 
310
  /* TRUE if generating an executable, position independent or not.  */
311
  unsigned int executable : 1;
312
 
313
  /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X
314
     flags.  */
315
  unsigned int execstack: 1;
316
 
317
  /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W
318
     flags.  */
319
  unsigned int noexecstack: 1;
320
 
321
  /* TRUE if PT_GNU_RELRO segment should be created.  */
322
  unsigned int relro: 1;
323
 
324
  /* TRUE if we should warn when adding a DT_TEXTREL to a shared object.  */
325
  unsigned int warn_shared_textrel: 1;
326
 
327
  /* TRUE if we should warn alternate ELF machine code.  */
328
  unsigned int warn_alternate_em: 1;
329
 
330
  /* TRUE if unreferenced sections should be removed.  */
331
  unsigned int gc_sections: 1;
332
 
333
  /* TRUE if user shoudl be informed of removed unreferenced sections.  */
334
  unsigned int print_gc_sections: 1;
335
 
336
  /* TRUE if .hash section should be created.  */
337
  unsigned int emit_hash: 1;
338
 
339
  /* TRUE if .gnu.hash section should be created.  */
340
  unsigned int emit_gnu_hash: 1;
341
 
342
  /* If TRUE reduce memory overheads, at the expense of speed. This will
343
     cause map file generation to use an O(N^2) algorithm and disable
344
     caching ELF symbol buffer.  */
345
  unsigned int reduce_memory_overheads: 1;
346
 
347
  /* TRUE if all data symbols should be dynamic.  */
348
   unsigned int dynamic_data: 1;
349
 
350
  /* TRUE if some symbols have to be dynamic, controlled by
351
     --dynamic-list command line options.  */
352
  unsigned int dynamic: 1;
353
 
354
  /* Non-NULL if .note.gnu.build-id section should be created.  */
355
  char *emit_note_gnu_build_id;
356
 
357
  /* What to do with unresolved symbols in an object file.
358
     When producing executables the default is GENERATE_ERROR.
359
     When producing shared libraries the default is IGNORE.  The
360
     assumption with shared libraries is that the reference will be
361
     resolved at load/execution time.  */
362
  enum report_method unresolved_syms_in_objects;
363
 
364
  /* What to do with unresolved symbols in a shared library.
365
     The same defaults apply.  */
366
  enum report_method unresolved_syms_in_shared_libs;
367
 
368
  /* Which symbols to strip.  */
369
  enum bfd_link_strip strip;
370
 
371
  /* Which local symbols to discard.  */
372
  enum bfd_link_discard discard;
373
 
374
  /* Criteria for skipping symbols when determining
375
     whether to include an object from an archive. */
376
  enum bfd_link_common_skip_ar_symbols common_skip_ar_symbols;
377
 
378
  /* Char that may appear as the first char of a symbol, but should be
379
     skipped (like symbol_leading_char) when looking up symbols in
380
     wrap_hash.  Used by PowerPC Linux for 'dot' symbols.  */
381
  char wrap_char;
382
 
383
  /* Separator between archive and filename in linker script filespecs.  */
384
  char path_separator;
385
 
386
  /* Function callbacks.  */
387
  const struct bfd_link_callbacks *callbacks;
388
 
389
  /* Hash table handled by BFD.  */
390
  struct bfd_link_hash_table *hash;
391
 
392
  /* Hash table of symbols to keep.  This is NULL unless strip is
393
     strip_some.  */
394
  struct bfd_hash_table *keep_hash;
395
 
396
  /* Hash table of symbols to report back via the notice callback.  If
397
     this is NULL, and notice_all is FALSE, then no symbols are
398
     reported back.  */
399
  struct bfd_hash_table *notice_hash;
400
 
401
  /* Hash table of symbols which are being wrapped (the --wrap linker
402
     option).  If this is NULL, no symbols are being wrapped.  */
403
  struct bfd_hash_table *wrap_hash;
404
 
405
  /* The output BFD.  */
406
  bfd *output_bfd;
407
 
408
  /* The list of input BFD's involved in the link.  These are chained
409
     together via the link_next field.  */
410
  bfd *input_bfds;
411
  bfd **input_bfds_tail;
412
 
413
  /* If a symbol should be created for each input BFD, this is section
414
     where those symbols should be placed.  It must be a section in
415
     the output BFD.  It may be NULL, in which case no such symbols
416
     will be created.  This is to support CREATE_OBJECT_SYMBOLS in the
417
     linker command language.  */
418
  asection *create_object_symbols_section;
419
 
420
  /* List of global symbol names that are starting points for marking
421
     sections against garbage collection.  */
422
  struct bfd_sym_chain *gc_sym_list;
423
 
424
  /* If a base output file is wanted, then this points to it */
425
  void *base_file;
426
 
427
  /* The function to call when the executable or shared object is
428
     loaded.  */
429
  const char *init_function;
430
 
431
  /* The function to call when the executable or shared object is
432
     unloaded.  */
433
  const char *fini_function;
434
 
435
  /* Number of relaxation passes.  Usually only one relaxation pass
436
     is needed.  But a backend can have as many relaxation passes as
437
     necessary.  During bfd_relax_section call, it is set to the
438
     current pass, starting from 0.  */
439
  int relax_pass;
440
 
441
  /* Number of relaxation trips.  This number is incremented every
442
     time the relaxation pass is restarted due to a previous
443
     relaxation returning true in *AGAIN.  */
444
  int relax_trip;
445
 
446
  /* Non-zero if auto-import thunks for DATA items in pei386 DLLs
447
     should be generated/linked against.  Set to 1 if this feature
448
     is explicitly requested by the user, -1 if enabled by default.  */
449
  int pei386_auto_import;
450
 
451
  /* Non-zero if runtime relocs for DATA items with non-zero addends
452
     in pei386 DLLs should be generated.  Set to 1 if this feature
453
     is explicitly requested by the user, -1 if enabled by default.  */
454
  int pei386_runtime_pseudo_reloc;
455
 
456
  /* How many spare .dynamic DT_NULL entries should be added?  */
457
  unsigned int spare_dynamic_tags;
458
 
459
  /* May be used to set DT_FLAGS for ELF. */
460
  bfd_vma flags;
461
 
462
  /* May be used to set DT_FLAGS_1 for ELF. */
463
  bfd_vma flags_1;
464
 
465
  /* Start and end of RELRO region.  */
466
  bfd_vma relro_start, relro_end;
467
 
468
  /* List of symbols should be dynamic.  */
469
  struct bfd_elf_dynamic_list *dynamic_list;
470
};
471
 
472
/* This structures holds a set of callback functions.  These are called
473
   by the BFD linker routines.  Except for the info functions, the first
474
   argument to each callback function is the bfd_link_info structure
475
   being used and each function returns a boolean value.  If the
476
   function returns FALSE, then the BFD function which called it should
477
   return with a failure indication.  */
478
 
479
struct bfd_link_callbacks
480
{
481
  /* A function which is called when an object is added from an
482
     archive.  ABFD is the archive element being added.  NAME is the
483
     name of the symbol which caused the archive element to be pulled
484
     in.  */
485
  bfd_boolean (*add_archive_element)
486
    (struct bfd_link_info *, bfd *abfd, const char *name);
487
  /* A function which is called when a symbol is found with multiple
488
     definitions.  NAME is the symbol which is defined multiple times.
489
     OBFD is the old BFD, OSEC is the old section, OVAL is the old
490
     value, NBFD is the new BFD, NSEC is the new section, and NVAL is
491
     the new value.  OBFD may be NULL.  OSEC and NSEC may be
492
     bfd_com_section or bfd_ind_section.  */
493
  bfd_boolean (*multiple_definition)
494
    (struct bfd_link_info *, const char *name,
495
     bfd *obfd, asection *osec, bfd_vma oval,
496
     bfd *nbfd, asection *nsec, bfd_vma nval);
497
  /* A function which is called when a common symbol is defined
498
     multiple times.  NAME is the symbol appearing multiple times.
499
     OBFD is the BFD of the existing symbol; it may be NULL if this is
500
     not known.  OTYPE is the type of the existing symbol, which may
501
     be bfd_link_hash_defined, bfd_link_hash_defweak,
502
     bfd_link_hash_common, or bfd_link_hash_indirect.  If OTYPE is
503
     bfd_link_hash_common, OSIZE is the size of the existing symbol.
504
     NBFD is the BFD of the new symbol.  NTYPE is the type of the new
505
     symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or
506
     bfd_link_hash_indirect.  If NTYPE is bfd_link_hash_common, NSIZE
507
     is the size of the new symbol.  */
508
  bfd_boolean (*multiple_common)
509
    (struct bfd_link_info *, const char *name,
510
     bfd *obfd, enum bfd_link_hash_type otype, bfd_vma osize,
511
     bfd *nbfd, enum bfd_link_hash_type ntype, bfd_vma nsize);
512
  /* A function which is called to add a symbol to a set.  ENTRY is
513
     the link hash table entry for the set itself (e.g.,
514
     __CTOR_LIST__).  RELOC is the relocation to use for an entry in
515
     the set when generating a relocatable file, and is also used to
516
     get the size of the entry when generating an executable file.
517
     ABFD, SEC and VALUE identify the value to add to the set.  */
518
  bfd_boolean (*add_to_set)
519
    (struct bfd_link_info *, struct bfd_link_hash_entry *entry,
520
     bfd_reloc_code_real_type reloc, bfd *abfd, asection *sec, bfd_vma value);
521
  /* A function which is called when the name of a g++ constructor or
522
     destructor is found.  This is only called by some object file
523
     formats.  CONSTRUCTOR is TRUE for a constructor, FALSE for a
524
     destructor.  This will use BFD_RELOC_CTOR when generating a
525
     relocatable file.  NAME is the name of the symbol found.  ABFD,
526
     SECTION and VALUE are the value of the symbol.  */
527
  bfd_boolean (*constructor)
528
    (struct bfd_link_info *, bfd_boolean constructor, const char *name,
529
     bfd *abfd, asection *sec, bfd_vma value);
530
  /* A function which is called to issue a linker warning.  For
531
     example, this is called when there is a reference to a warning
532
     symbol.  WARNING is the warning to be issued.  SYMBOL is the name
533
     of the symbol which triggered the warning; it may be NULL if
534
     there is none.  ABFD, SECTION and ADDRESS identify the location
535
     which trigerred the warning; either ABFD or SECTION or both may
536
     be NULL if the location is not known.  */
537
  bfd_boolean (*warning)
538
    (struct bfd_link_info *, const char *warning, const char *symbol,
539
     bfd *abfd, asection *section, bfd_vma address);
540
  /* A function which is called when a relocation is attempted against
541
     an undefined symbol.  NAME is the symbol which is undefined.
542
     ABFD, SECTION and ADDRESS identify the location from which the
543
     reference is made. IS_FATAL indicates whether an undefined symbol is
544
     a fatal error or not. In some cases SECTION may be NULL.  */
545
  bfd_boolean (*undefined_symbol)
546
    (struct bfd_link_info *, const char *name, bfd *abfd,
547
     asection *section, bfd_vma address, bfd_boolean is_fatal);
548
  /* A function which is called when a reloc overflow occurs. ENTRY is
549
     the link hash table entry for the symbol the reloc is against.
550
     NAME is the name of the local symbol or section the reloc is
551
     against, RELOC_NAME is the name of the relocation, and ADDEND is
552
     any addend that is used.  ABFD, SECTION and ADDRESS identify the
553
     location at which the overflow occurs; if this is the result of a
554
     bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
555
     ABFD will be NULL.  */
556
  bfd_boolean (*reloc_overflow)
557
    (struct bfd_link_info *, struct bfd_link_hash_entry *entry,
558
     const char *name, const char *reloc_name, bfd_vma addend,
559
     bfd *abfd, asection *section, bfd_vma address);
560
  /* A function which is called when a dangerous reloc is performed.
561
     MESSAGE is an appropriate message.
562
     ABFD, SECTION and ADDRESS identify the location at which the
563
     problem occurred; if this is the result of a
564
     bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
565
     ABFD will be NULL.  */
566
  bfd_boolean (*reloc_dangerous)
567
    (struct bfd_link_info *, const char *message,
568
     bfd *abfd, asection *section, bfd_vma address);
569
  /* A function which is called when a reloc is found to be attached
570
     to a symbol which is not being written out.  NAME is the name of
571
     the symbol.  ABFD, SECTION and ADDRESS identify the location of
572
     the reloc; if this is the result of a
573
     bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
574
     ABFD will be NULL.  */
575
  bfd_boolean (*unattached_reloc)
576
    (struct bfd_link_info *, const char *name,
577
     bfd *abfd, asection *section, bfd_vma address);
578
  /* A function which is called when a symbol in notice_hash is
579
     defined or referenced.  NAME is the symbol.  ABFD, SECTION and
580
     ADDRESS are the value of the symbol.  If SECTION is
581
     bfd_und_section, this is a reference.  */
582
  bfd_boolean (*notice)
583
    (struct bfd_link_info *, const char *name,
584
     bfd *abfd, asection *section, bfd_vma address);
585
  /* Error or warning link info message.  */
586
  void (*einfo)
587
    (const char *fmt, ...);
588
  /* General link info message.  */
589
  void (*info)
590
    (const char *fmt, ...);
591
  /* Message to be printed in linker map file.  */
592
  void (*minfo)
593
    (const char *fmt, ...);
594
  /* This callback provides a chance for users of the BFD library to
595
     override its decision about whether to place two adjacent sections
596
     into the same segment.  */
597
  bfd_boolean (*override_segment_assignment)
598
    (struct bfd_link_info *, bfd * abfd,
599
     asection * current_section, asection * previous_section,
600
     bfd_boolean new_segment);
601
};
602
 
603
/* The linker builds link_order structures which tell the code how to
604
   include input data in the output file.  */
605
 
606
/* These are the types of link_order structures.  */
607
 
608
enum bfd_link_order_type
609
{
610
  bfd_undefined_link_order,     /* Undefined.  */
611
  bfd_indirect_link_order,      /* Built from a section.  */
612
  bfd_data_link_order,          /* Set to explicit data.  */
613
  bfd_section_reloc_link_order, /* Relocate against a section.  */
614
  bfd_symbol_reloc_link_order   /* Relocate against a symbol.  */
615
};
616
 
617
/* This is the link_order structure itself.  These form a chain
618
   attached to the output section whose contents they are describing.  */
619
 
620
struct bfd_link_order
621
{
622
  /* Next link_order in chain.  */
623
  struct bfd_link_order *next;
624
  /* Type of link_order.  */
625
  enum bfd_link_order_type type;
626
  /* Offset within output section.  */
627
  bfd_vma offset;
628
  /* Size within output section.  */
629
  bfd_size_type size;
630
  /* Type specific information.  */
631
  union
632
    {
633
      struct
634
        {
635
          /* Section to include.  If this is used, then
636
             section->output_section must be the section the
637
             link_order is attached to, section->output_offset must
638
             equal the link_order offset field, and section->size
639
             must equal the link_order size field.  Maybe these
640
             restrictions should be relaxed someday.  */
641
          asection *section;
642
        } indirect;
643
      struct
644
        {
645
          /* Size of contents, or zero when contents size == size
646
             within output section.
647
             A non-zero value allows filling of the output section
648
             with an arbitrary repeated pattern.  */
649
          unsigned int size;
650
          /* Data to put into file.  */
651
          bfd_byte *contents;
652
        } data;
653
      struct
654
        {
655
          /* Description of reloc to generate.  Used for
656
             bfd_section_reloc_link_order and
657
             bfd_symbol_reloc_link_order.  */
658
          struct bfd_link_order_reloc *p;
659
        } reloc;
660
    } u;
661
};
662
 
663
/* A linker order of type bfd_section_reloc_link_order or
664
   bfd_symbol_reloc_link_order means to create a reloc against a
665
   section or symbol, respectively.  This is used to implement -Ur to
666
   generate relocs for the constructor tables.  The
667
   bfd_link_order_reloc structure describes the reloc that BFD should
668
   create.  It is similar to a arelent, but I didn't use arelent
669
   because the linker does not know anything about most symbols, and
670
   any asymbol structure it creates will be partially meaningless.
671
   This information could logically be in the bfd_link_order struct,
672
   but I didn't want to waste the space since these types of relocs
673
   are relatively rare.  */
674
 
675
struct bfd_link_order_reloc
676
{
677
  /* Reloc type.  */
678
  bfd_reloc_code_real_type reloc;
679
 
680
  union
681
    {
682
      /* For type bfd_section_reloc_link_order, this is the section
683
         the reloc should be against.  This must be a section in the
684
         output BFD, not any of the input BFDs.  */
685
      asection *section;
686
      /* For type bfd_symbol_reloc_link_order, this is the name of the
687
         symbol the reloc should be against.  */
688
      const char *name;
689
    } u;
690
 
691
  /* Addend to use.  The object file should contain zero.  The BFD
692
     backend is responsible for filling in the contents of the object
693
     file correctly.  For some object file formats (e.g., COFF) the
694
     addend must be stored into in the object file, and for some
695
     (e.g., SPARC a.out) it is kept in the reloc.  */
696
  bfd_vma addend;
697
};
698
 
699
/* Allocate a new link_order for a section.  */
700
extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *);
701
 
702
/* These structures are used to describe version information for the
703
   ELF linker.  These structures could be manipulated entirely inside
704
   BFD, but it would be a pain.  Instead, the regular linker sets up
705
   these structures, and then passes them into BFD.  */
706
 
707
/* Glob pattern for a version.  */
708
 
709
struct bfd_elf_version_expr
710
{
711
  /* Next glob pattern for this version.  */
712
  struct bfd_elf_version_expr *next;
713
  /* Glob pattern.  */
714
  const char *pattern;
715
  /* Set if pattern is not a glob.  */
716
  unsigned int literal : 1;
717
  /* Defined by ".symver".  */
718
  unsigned int symver : 1;
719
  /* Defined by version script.  */
720
  unsigned int script : 1;
721
  /* Pattern type.  */
722
#define BFD_ELF_VERSION_C_TYPE          1
723
#define BFD_ELF_VERSION_CXX_TYPE        2
724
#define BFD_ELF_VERSION_JAVA_TYPE       4
725
  unsigned int mask : 3;
726
};
727
 
728
struct bfd_elf_version_expr_head
729
{
730
  /* List of all patterns, both wildcards and non-wildcards.  */
731
  struct bfd_elf_version_expr *list;
732
  /* Hash table for non-wildcards.  */
733
  void *htab;
734
  /* Remaining patterns.  */
735
  struct bfd_elf_version_expr *remaining;
736
  /* What kind of pattern types are present in list (bitmask).  */
737
  unsigned int mask;
738
};
739
 
740
/* Version dependencies.  */
741
 
742
struct bfd_elf_version_deps
743
{
744
  /* Next dependency for this version.  */
745
  struct bfd_elf_version_deps *next;
746
  /* The version which this version depends upon.  */
747
  struct bfd_elf_version_tree *version_needed;
748
};
749
 
750
/* A node in the version tree.  */
751
 
752
struct bfd_elf_version_tree
753
{
754
  /* Next version.  */
755
  struct bfd_elf_version_tree *next;
756
  /* Name of this version.  */
757
  const char *name;
758
  /* Version number.  */
759
  unsigned int vernum;
760
  /* Regular expressions for global symbols in this version.  */
761
  struct bfd_elf_version_expr_head globals;
762
  /* Regular expressions for local symbols in this version.  */
763
  struct bfd_elf_version_expr_head locals;
764
  /* List of versions which this version depends upon.  */
765
  struct bfd_elf_version_deps *deps;
766
  /* Index of the version name.  This is used within BFD.  */
767
  unsigned int name_indx;
768
  /* Whether this version tree was used.  This is used within BFD.  */
769
  int used;
770
  /* Matching hook.  */
771
  struct bfd_elf_version_expr *(*match)
772
    (struct bfd_elf_version_expr_head *head,
773
     struct bfd_elf_version_expr *prev, const char *sym);
774
};
775
 
776
struct bfd_elf_dynamic_list
777
{
778
  struct bfd_elf_version_expr_head head;
779
  struct bfd_elf_version_expr *(*match)
780
    (struct bfd_elf_version_expr_head *head,
781
     struct bfd_elf_version_expr *prev, const char *sym);
782
};
783
 
784
#endif

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