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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [ld/] [ldlang.h] - Blame information for rev 146

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1 145 khays
/* ldlang.h - linker command language support
2
   Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3
   2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4
   Free Software Foundation, Inc.
5
 
6
   This file is part of the GNU Binutils.
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 LDLANG_H
24
#define LDLANG_H
25
 
26
#define DEFAULT_MEMORY_REGION   "*default*"
27
 
28
typedef enum
29
{
30
  lang_input_file_is_l_enum,
31
  lang_input_file_is_symbols_only_enum,
32
  lang_input_file_is_marker_enum,
33
  lang_input_file_is_fake_enum,
34
  lang_input_file_is_search_file_enum,
35
  lang_input_file_is_file_enum
36
} lang_input_file_enum_type;
37
 
38
struct _fill_type
39
{
40
  size_t size;
41
  unsigned char data[1];
42
};
43
 
44
typedef struct statement_list
45
{
46
  union lang_statement_union *  head;
47
  union lang_statement_union ** tail;
48
} lang_statement_list_type;
49
 
50
typedef struct memory_region_name_struct
51
{
52
  const char * name;
53
  struct memory_region_name_struct * next;
54
} lang_memory_region_name;
55
 
56
typedef struct memory_region_struct
57
{
58
  lang_memory_region_name name_list;
59
  struct memory_region_struct *next;
60
  bfd_vma origin;
61
  bfd_size_type length;
62
  bfd_vma current;
63
  union lang_statement_union *last_os;
64
  flagword flags;
65
  flagword not_flags;
66
  bfd_boolean had_full_message;
67
} lang_memory_region_type;
68
 
69
enum statement_enum
70
{
71
  lang_output_section_statement_enum,
72
  lang_assignment_statement_enum,
73
  lang_input_statement_enum,
74
  lang_address_statement_enum,
75
  lang_wild_statement_enum,
76
  lang_input_section_enum,
77
  lang_object_symbols_statement_enum,
78
  lang_fill_statement_enum,
79
  lang_data_statement_enum,
80
  lang_reloc_statement_enum,
81
  lang_target_statement_enum,
82
  lang_output_statement_enum,
83
  lang_padding_statement_enum,
84
  lang_group_statement_enum,
85
  lang_insert_statement_enum,
86
  lang_constructors_statement_enum
87
};
88
 
89
typedef struct lang_statement_header_struct
90
{
91
  union lang_statement_union *next;
92
  enum statement_enum type;
93
} lang_statement_header_type;
94
 
95
typedef struct
96
{
97
  lang_statement_header_type header;
98
  union etree_union *exp;
99
} lang_assignment_statement_type;
100
 
101
typedef struct lang_target_statement_struct
102
{
103
  lang_statement_header_type header;
104
  const char *target;
105
} lang_target_statement_type;
106
 
107
typedef struct lang_output_statement_struct
108
{
109
  lang_statement_header_type header;
110
  const char *name;
111
} lang_output_statement_type;
112
 
113
/* Section types specified in a linker script.  */
114
 
115
enum section_type
116
{
117
  normal_section,
118
  overlay_section,
119
  noload_section,
120
  noalloc_section
121
};
122
 
123
/* This structure holds a list of program headers describing
124
   segments in which this section should be placed.  */
125
 
126
typedef struct lang_output_section_phdr_list
127
{
128
  struct lang_output_section_phdr_list *next;
129
  const char *name;
130
  bfd_boolean used;
131
} lang_output_section_phdr_list;
132
 
133
typedef struct lang_output_section_statement_struct
134
{
135
  lang_statement_header_type header;
136
  lang_statement_list_type children;
137
  struct lang_output_section_statement_struct *next;
138
  struct lang_output_section_statement_struct *prev;
139
  const char *name;
140
  asection *bfd_section;
141
  lang_memory_region_type *region;
142
  lang_memory_region_type *lma_region;
143
  fill_type *fill;
144
  union etree_union *addr_tree;
145
  union etree_union *load_base;
146
 
147
  /* If non-null, an expression to evaluate after setting the section's
148
     size.  The expression is evaluated inside REGION (above) with '.'
149
     set to the end of the section.  Used in the last overlay section
150
     to move '.' past all the overlaid sections.  */
151
  union etree_union *update_dot_tree;
152
 
153
  lang_output_section_phdr_list *phdrs;
154
 
155
  unsigned int block_value;
156
  int subsection_alignment;     /* Alignment of components.  */
157
  int section_alignment;        /* Alignment of start of section.  */
158
  int constraint;
159
  flagword flags;
160
  enum section_type sectype;
161
  unsigned int processed_vma : 1;
162
  unsigned int processed_lma : 1;
163
  unsigned int all_input_readonly : 1;
164
  /* If this section should be ignored.  */
165
  unsigned int ignored : 1;
166
  /* If there is a symbol relative to this section.  */
167
  unsigned int section_relative_symbol : 1;
168
} lang_output_section_statement_type;
169
 
170
typedef struct
171
{
172
  lang_statement_header_type header;
173
} lang_common_statement_type;
174
 
175
typedef struct
176
{
177
  lang_statement_header_type header;
178
} lang_object_symbols_statement_type;
179
 
180
typedef struct
181
{
182
  lang_statement_header_type header;
183
  fill_type *fill;
184
  int size;
185
  asection *output_section;
186
} lang_fill_statement_type;
187
 
188
typedef struct
189
{
190
  lang_statement_header_type header;
191
  unsigned int type;
192
  union etree_union *exp;
193
  bfd_vma value;
194
  asection *output_section;
195
  bfd_vma output_offset;
196
} lang_data_statement_type;
197
 
198
/* Generate a reloc in the output file.  */
199
 
200
typedef struct
201
{
202
  lang_statement_header_type header;
203
 
204
  /* Reloc to generate.  */
205
  bfd_reloc_code_real_type reloc;
206
 
207
  /* Reloc howto structure.  */
208
  reloc_howto_type *howto;
209
 
210
  /* Section to generate reloc against.
211
     Exactly one of section and name must be NULL.  */
212
  asection *section;
213
 
214
  /* Name of symbol to generate reloc against.
215
     Exactly one of section and name must be NULL.  */
216
  const char *name;
217
 
218
  /* Expression for addend.  */
219
  union etree_union *addend_exp;
220
 
221
  /* Resolved addend.  */
222
  bfd_vma addend_value;
223
 
224
  /* Output section where reloc should be performed.  */
225
  asection *output_section;
226
 
227
  /* Offset within output section.  */
228
  bfd_vma output_offset;
229
} lang_reloc_statement_type;
230
 
231
typedef struct lang_input_statement_struct
232
{
233
  lang_statement_header_type header;
234
  /* Name of this file.  */
235
  const char *filename;
236
  /* Name to use for the symbol giving address of text start.
237
     Usually the same as filename, but for a file spec'd with
238
     -l this is the -l switch itself rather than the filename.  */
239
  const char *local_sym_name;
240
 
241
  bfd *the_bfd;
242
 
243
  /* Point to the next file - whatever it is, wanders up and down
244
     archives */
245
  union lang_statement_union *next;
246
 
247
  /* Point to the next file, but skips archive contents.  */
248
  union lang_statement_union *next_real_file;
249
 
250
  const char *target;
251
 
252
  unsigned int maybe_archive : 1;
253
 
254
  /* 1 means search a set of directories for this file.  */
255
  unsigned int search_dirs_flag : 1;
256
 
257
  /* 1 means this was found in a search directory marked as sysrooted,
258
     if search_dirs_flag is false, otherwise, that it should be
259
     searched in ld_sysroot before any other location, as long as it
260
     starts with a slash.  */
261
  unsigned int sysrooted : 1;
262
 
263
  /* 1 means this is base file of incremental load.
264
     Do not load this file's text or data.
265
     Also default text_start to after this file's bss.  */
266
  unsigned int just_syms_flag : 1;
267
 
268
  /* Whether to search for this entry as a dynamic archive.  */
269
  unsigned int dynamic : 1;
270
 
271
  /* Whether DT_NEEDED tags should be added for dynamic libraries in
272
     DT_NEEDED tags from this entry.  */
273
  unsigned int add_DT_NEEDED_for_dynamic : 1;
274
 
275
  /* Whether this entry should cause a DT_NEEDED tag only when
276
     satisfying references from regular files, or always.  */
277
  unsigned int add_DT_NEEDED_for_regular : 1;
278
 
279
  /* Whether to include the entire contents of an archive.  */
280
  unsigned int whole_archive : 1;
281
 
282
  /* Set when bfd opening is successful.  */
283
  unsigned int loaded : 1;
284
 
285
  unsigned int real : 1;
286
 
287
  /* Set if the file does not exist.  */
288
  unsigned int missing_file : 1;
289
 
290
#ifdef ENABLE_PLUGINS
291
  /* Set if the file was claimed by a plugin.  */
292
  unsigned int claimed : 1;
293
 
294
  /* Set if the file was claimed from an archive.  */
295
  unsigned int claim_archive : 1;
296
#endif /* ENABLE_PLUGINS */
297
 
298
} lang_input_statement_type;
299
 
300
typedef struct
301
{
302
  lang_statement_header_type header;
303
  asection *section;
304
} lang_input_section_type;
305
 
306
typedef struct lang_wild_statement_struct lang_wild_statement_type;
307
 
308
typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *,
309
                            asection *, lang_input_statement_type *, void *);
310
 
311
typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *,
312
                                             lang_input_statement_type *,
313
                                             callback_t callback,
314
                                             void *data);
315
 
316
typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *,
317
                                                 bfd *, const asection *);
318
 
319
/* Binary search tree structure to efficiently sort sections by
320
   name.  */
321
typedef struct lang_section_bst
322
{
323
  asection *section;
324
  struct lang_section_bst *left;
325
  struct lang_section_bst *right;
326
} lang_section_bst_type;
327
 
328
struct lang_wild_statement_struct
329
{
330
  lang_statement_header_type header;
331
  const char *filename;
332
  bfd_boolean filenames_sorted;
333
  struct wildcard_list *section_list;
334
  bfd_boolean keep_sections;
335
  lang_statement_list_type children;
336
 
337
  walk_wild_section_handler_t walk_wild_section_handler;
338
  struct wildcard_list *handler_data[4];
339
  lang_section_bst_type *tree;
340
};
341
 
342
typedef struct lang_address_statement_struct
343
{
344
  lang_statement_header_type header;
345
  const char *section_name;
346
  union etree_union *address;
347
  const segment_type *segment;
348
} lang_address_statement_type;
349
 
350
typedef struct
351
{
352
  lang_statement_header_type header;
353
  bfd_vma output_offset;
354
  size_t size;
355
  asection *output_section;
356
  fill_type *fill;
357
} lang_padding_statement_type;
358
 
359
/* A group statement collects a set of libraries together.  The
360
   libraries are searched multiple times, until no new undefined
361
   symbols are found.  The effect is to search a group of libraries as
362
   though they were a single library.  */
363
 
364
typedef struct
365
{
366
  lang_statement_header_type header;
367
  lang_statement_list_type children;
368
} lang_group_statement_type;
369
 
370
typedef struct
371
{
372
  lang_statement_header_type header;
373
  const char *where;
374
  bfd_boolean is_before;
375
} lang_insert_statement_type;
376
 
377
typedef union lang_statement_union
378
{
379
  lang_statement_header_type header;
380
  lang_wild_statement_type wild_statement;
381
  lang_data_statement_type data_statement;
382
  lang_reloc_statement_type reloc_statement;
383
  lang_address_statement_type address_statement;
384
  lang_output_section_statement_type output_section_statement;
385
  lang_assignment_statement_type assignment_statement;
386
  lang_input_statement_type input_statement;
387
  lang_target_statement_type target_statement;
388
  lang_output_statement_type output_statement;
389
  lang_input_section_type input_section;
390
  lang_common_statement_type common_statement;
391
  lang_object_symbols_statement_type object_symbols_statement;
392
  lang_fill_statement_type fill_statement;
393
  lang_padding_statement_type padding_statement;
394
  lang_group_statement_type group_statement;
395
  lang_insert_statement_type insert_statement;
396
} lang_statement_union_type;
397
 
398
/* This structure holds information about a program header, from the
399
   PHDRS command in the linker script.  */
400
 
401
struct lang_phdr
402
{
403
  struct lang_phdr *next;
404
  const char *name;
405
  unsigned long type;
406
  bfd_boolean filehdr;
407
  bfd_boolean phdrs;
408
  etree_type *at;
409
  etree_type *flags;
410
};
411
 
412
extern struct lang_phdr *lang_phdr_list;
413
 
414
/* This structure is used to hold a list of sections which may not
415
   cross reference each other.  */
416
 
417
typedef struct lang_nocrossref
418
{
419
  struct lang_nocrossref *next;
420
  const char *name;
421
} lang_nocrossref_type;
422
 
423
/* The list of nocrossref lists.  */
424
 
425
struct lang_nocrossrefs
426
{
427
  struct lang_nocrossrefs *next;
428
  lang_nocrossref_type *list;
429
};
430
 
431
extern struct lang_nocrossrefs *nocrossref_list;
432
 
433
/* This structure is used to hold a list of input section names which
434
   will not match an output section in the linker script.  */
435
 
436
struct unique_sections
437
{
438
  struct unique_sections *next;
439
  const char *name;
440
};
441
 
442
/* This structure records symbols for which we need to keep track of
443
   definedness for use in the DEFINED () test.  */
444
 
445
struct lang_definedness_hash_entry
446
{
447
  struct bfd_hash_entry root;
448
  int iteration;
449
};
450
 
451
/* Used by place_orphan to keep track of orphan sections and statements.  */
452
 
453
struct orphan_save
454
{
455
  const char *name;
456
  flagword flags;
457
  lang_output_section_statement_type *os;
458
  asection **section;
459
  lang_statement_union_type **stmt;
460
  lang_output_section_statement_type **os_tail;
461
};
462
 
463
extern const char *output_target;
464
extern lang_output_section_statement_type *abs_output_section;
465
extern lang_statement_list_type lang_output_section_statement;
466
extern bfd_boolean lang_has_input_file;
467
extern etree_type *base;
468
extern lang_statement_list_type *stat_ptr;
469
extern bfd_boolean delete_output_file_on_failure;
470
 
471
extern struct bfd_sym_chain entry_symbol;
472
extern const char *entry_section;
473
extern bfd_boolean entry_from_cmdline;
474
extern lang_statement_list_type file_chain;
475
extern lang_statement_list_type input_file_chain;
476
 
477
extern int lang_statement_iteration;
478
extern bfd_boolean missing_file;
479
 
480
extern void lang_init
481
  (void);
482
extern void lang_finish
483
  (void);
484
extern lang_memory_region_type * lang_memory_region_lookup
485
  (const char * const, bfd_boolean);
486
extern void lang_memory_region_alias
487
  (const char *, const char *);
488
extern void lang_map
489
  (void);
490
extern void lang_set_flags
491
  (lang_memory_region_type *, const char *, int);
492
extern void lang_add_output
493
  (const char *, int from_script);
494
extern lang_output_section_statement_type *lang_enter_output_section_statement
495
  (const char *output_section_statement_name,
496
   etree_type *address_exp,
497
   enum section_type sectype,
498
   etree_type *align,
499
   etree_type *subalign,
500
   etree_type *, int);
501
extern void lang_final
502
  (void);
503
extern void lang_relax_sections
504
  (bfd_boolean);
505
extern void lang_process
506
  (void);
507
extern void lang_section_start
508
  (const char *, union etree_union *, const segment_type *);
509
extern void lang_add_entry
510
  (const char *, bfd_boolean);
511
extern void lang_default_entry
512
  (const char *);
513
extern void lang_add_target
514
  (const char *);
515
extern void lang_add_wild
516
  (struct wildcard_spec *, struct wildcard_list *, bfd_boolean);
517
extern void lang_add_map
518
  (const char *);
519
extern void lang_add_fill
520
  (fill_type *);
521
extern lang_assignment_statement_type *lang_add_assignment
522
  (union etree_union *);
523
extern void lang_add_attribute
524
  (enum statement_enum);
525
extern void lang_startup
526
  (const char *);
527
extern void lang_float
528
  (bfd_boolean);
529
extern void lang_leave_output_section_statement
530
  (fill_type *, const char *, lang_output_section_phdr_list *,
531
   const char *);
532
extern void lang_abs_symbol_at_end_of
533
  (const char *, const char *);
534
extern void lang_abs_symbol_at_beginning_of
535
  (const char *, const char *);
536
extern void lang_statement_append
537
  (lang_statement_list_type *, lang_statement_union_type *,
538
   lang_statement_union_type **);
539
extern void lang_for_each_input_file
540
  (void (*dothis) (lang_input_statement_type *));
541
extern void lang_for_each_file
542
  (void (*dothis) (lang_input_statement_type *));
543
extern void lang_reset_memory_regions
544
  (void);
545
extern void lang_do_assignments
546
  (lang_phase_type);
547
 
548
#define LANG_FOR_EACH_INPUT_STATEMENT(statement)                        \
549
  lang_input_statement_type *statement;                                 \
550
  for (statement = (lang_input_statement_type *) file_chain.head;       \
551
       statement != (lang_input_statement_type *) NULL;                 \
552
       statement = (lang_input_statement_type *) statement->next)       \
553
 
554
#define lang_output_section_find(NAME) \
555
  lang_output_section_statement_lookup (NAME, 0, FALSE)
556
 
557
extern void lang_process
558
  (void);
559
extern void ldlang_add_file
560
  (lang_input_statement_type *);
561
extern lang_output_section_statement_type *lang_output_section_find_by_flags
562
  (const asection *, lang_output_section_statement_type **,
563
   lang_match_sec_type_func);
564
extern lang_output_section_statement_type *lang_insert_orphan
565
  (asection *, const char *, int, lang_output_section_statement_type *,
566
   struct orphan_save *, etree_type *, lang_statement_list_type *);
567
extern lang_input_statement_type *lang_add_input_file
568
  (const char *, lang_input_file_enum_type, const char *);
569
extern void lang_add_keepsyms_file
570
  (const char *);
571
extern lang_output_section_statement_type *lang_output_section_statement_lookup
572
  (const char *, int, bfd_boolean);
573
extern lang_output_section_statement_type *next_matching_output_section_statement
574
  (lang_output_section_statement_type *, int);
575
extern void ldlang_add_undef
576
  (const char *const, bfd_boolean);
577
extern void lang_add_output_format
578
  (const char *, const char *, const char *, int);
579
extern void lang_list_init
580
  (lang_statement_list_type *);
581
extern void push_stat_ptr
582
  (lang_statement_list_type *);
583
extern void pop_stat_ptr
584
  (void);
585
extern void lang_add_data
586
  (int type, union etree_union *);
587
extern void lang_add_reloc
588
  (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *,
589
   union etree_union *);
590
extern void lang_for_each_statement
591
  (void (*) (lang_statement_union_type *));
592
extern void lang_for_each_statement_worker
593
  (void (*) (lang_statement_union_type *), lang_statement_union_type *);
594
extern void *stat_alloc
595
  (size_t);
596
extern void strip_excluded_output_sections
597
  (void);
598
extern void dprint_statement
599
  (lang_statement_union_type *, int);
600
extern void lang_size_sections
601
  (bfd_boolean *, bfd_boolean);
602
extern void one_lang_size_sections_pass
603
  (bfd_boolean *, bfd_boolean);
604
extern void lang_add_insert
605
  (const char *, int);
606
extern void lang_enter_group
607
  (void);
608
extern void lang_leave_group
609
  (void);
610
extern void lang_add_section
611
  (lang_statement_list_type *, asection *,
612
   lang_output_section_statement_type *);
613
extern void lang_new_phdr
614
  (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *,
615
   etree_type *);
616
extern void lang_add_nocrossref
617
  (lang_nocrossref_type *);
618
extern void lang_enter_overlay
619
  (etree_type *, etree_type *);
620
extern void lang_enter_overlay_section
621
  (const char *);
622
extern void lang_leave_overlay_section
623
  (fill_type *, lang_output_section_phdr_list *);
624
extern void lang_leave_overlay
625
  (etree_type *, int, fill_type *, const char *,
626
   lang_output_section_phdr_list *, const char *);
627
 
628
extern struct bfd_elf_version_tree *lang_elf_version_info;
629
 
630
extern struct bfd_elf_version_expr *lang_new_vers_pattern
631
  (struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean);
632
extern struct bfd_elf_version_tree *lang_new_vers_node
633
  (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *);
634
extern struct bfd_elf_version_deps *lang_add_vers_depend
635
  (struct bfd_elf_version_deps *, const char *);
636
extern void lang_register_vers_node
637
  (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *);
638
extern void lang_append_dynamic_list (struct bfd_elf_version_expr *);
639
extern void lang_append_dynamic_list_cpp_typeinfo (void);
640
extern void lang_append_dynamic_list_cpp_new (void);
641
extern void lang_add_unique
642
  (const char *);
643
extern const char *lang_get_output_target
644
  (void);
645
extern void lang_track_definedness (const char *);
646
extern int lang_symbol_definition_iteration (const char *);
647
extern void lang_update_definedness
648
  (const char *, struct bfd_link_hash_entry *);
649
 
650
extern void add_excluded_libs (const char *);
651
extern bfd_boolean load_symbols
652
  (lang_input_statement_type *, lang_statement_list_type *);
653
 
654
extern bfd_boolean
655
ldlang_override_segment_assignment
656
  (struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean);
657
 
658
extern void
659
lang_ld_feature (char *);
660
 
661
#endif

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