aboutsummaryrefslogtreecommitdiff
path: root/ld/ldlang.h
blob: 7cb7610e477a51330a64e89f4c0b4e2b8e58e29d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
/* ldlang.h - linker command language support
   Copyright (C) 1991-2015 Free Software Foundation, Inc.

   This file is part of the GNU Binutils.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#ifndef LDLANG_H
#define LDLANG_H

#define DEFAULT_MEMORY_REGION   "*default*"

typedef enum
{
  lang_input_file_is_l_enum,
  lang_input_file_is_symbols_only_enum,
  lang_input_file_is_marker_enum,
  lang_input_file_is_fake_enum,
  lang_input_file_is_search_file_enum,
  lang_input_file_is_file_enum
} lang_input_file_enum_type;

struct _fill_type
{
  size_t size;
  unsigned char data[1];
};

typedef struct statement_list
{
  union lang_statement_union *  head;
  union lang_statement_union ** tail;
} lang_statement_list_type;

typedef struct memory_region_name_struct
{
  const char * name;
  struct memory_region_name_struct * next;
} lang_memory_region_name;

typedef struct memory_region_struct
{
  lang_memory_region_name name_list;
  struct memory_region_struct *next;
  union etree_union *origin_exp;
  bfd_vma origin;
  bfd_size_type length;
  union etree_union *length_exp;
  bfd_vma current;
  union lang_statement_union *last_os;
  flagword flags;
  flagword not_flags;
  bfd_boolean had_full_message;
} lang_memory_region_type;

enum statement_enum
{
  lang_output_section_statement_enum,
  lang_assignment_statement_enum,
  lang_input_statement_enum,
  lang_address_statement_enum,
  lang_wild_statement_enum,
  lang_input_section_enum,
  lang_object_symbols_statement_enum,
  lang_fill_statement_enum,
  lang_data_statement_enum,
  lang_reloc_statement_enum,
  lang_target_statement_enum,
  lang_output_statement_enum,
  lang_padding_statement_enum,
  lang_group_statement_enum,
  lang_insert_statement_enum,
  lang_constructors_statement_enum
};

typedef struct lang_statement_header_struct
{
  union lang_statement_union *next;
  enum statement_enum type;
} lang_statement_header_type;

typedef struct
{
  lang_statement_header_type header;
  union etree_union *exp;
} lang_assignment_statement_type;

typedef struct lang_target_statement_struct
{
  lang_statement_header_type header;
  const char *target;
} lang_target_statement_type;

typedef struct lang_output_statement_struct
{
  lang_statement_header_type header;
  const char *name;
} lang_output_statement_type;

/* Section types specified in a linker script.  */

enum section_type
{
  normal_section,
  overlay_section,
  noload_section,
  noalloc_section
};

/* This structure holds a list of program headers describing
   segments in which this section should be placed.  */

typedef struct lang_output_section_phdr_list
{
  struct lang_output_section_phdr_list *next;
  const char *name;
  bfd_boolean used;
} lang_output_section_phdr_list;

typedef struct lang_output_section_statement_struct
{
  lang_statement_header_type header;
  lang_statement_list_type children;
  struct lang_output_section_statement_struct *next;
  struct lang_output_section_statement_struct *prev;
  const char *name;
  asection *bfd_section;
  lang_memory_region_type *region;
  lang_memory_region_type *lma_region;
  fill_type *fill;
  union etree_union *addr_tree;
  union etree_union *load_base;

  /* If non-null, an expression to evaluate after setting the section's
     size.  The expression is evaluated inside REGION (above) with '.'
     set to the end of the section.  Used in the last overlay section
     to move '.' past all the overlaid sections.  */
  union etree_union *update_dot_tree;

  lang_output_section_phdr_list *phdrs;

  unsigned int block_value;
  int subsection_alignment;	/* Alignment of components.  */
  int section_alignment;	/* Alignment of start of section.  */
  int constraint;
  flagword flags;
  enum section_type sectype;
  unsigned int processed_vma : 1;
  unsigned int processed_lma : 1;
  unsigned int all_input_readonly : 1;
  /* If this section should be ignored.  */
  unsigned int ignored : 1;
  /* If this section should update "dot".  Prevents section being ignored.  */
  unsigned int update_dot : 1;
  /* If this section is after assignment to _end.  */
  unsigned int after_end : 1;
  /* If this section uses the alignment of its input sections.  */
  unsigned int align_lma_with_input : 1;
} lang_output_section_statement_type;

typedef struct
{
  lang_statement_header_type header;
} lang_common_statement_type;

typedef struct
{
  lang_statement_header_type header;
} lang_object_symbols_statement_type;

typedef struct
{
  lang_statement_header_type header;
  fill_type *fill;
  int size;
  asection *output_section;
} lang_fill_statement_type;

typedef struct
{
  lang_statement_header_type header;
  unsigned int type;
  union etree_union *exp;
  bfd_vma value;
  asection *output_section;
  bfd_vma output_offset;
} lang_data_statement_type;

/* Generate a reloc in the output file.  */

typedef struct
{
  lang_statement_header_type header;

  /* Reloc to generate.  */
  bfd_reloc_code_real_type reloc;

  /* Reloc howto structure.  */
  reloc_howto_type *howto;

  /* Section to generate reloc against.
     Exactly one of section and name must be NULL.  */
  asection *section;

  /* Name of symbol to generate reloc against.
     Exactly one of section and name must be NULL.  */
  const char *name;

  /* Expression for addend.  */
  union etree_union *addend_exp;

  /* Resolved addend.  */
  bfd_vma addend_value;

  /* Output section where reloc should be performed.  */
  asection *output_section;

  /* Offset within output section.  */
  bfd_vma output_offset;
} lang_reloc_statement_type;

struct lang_input_statement_flags
{
  /* 1 means this file was specified in a -l option.  */
  unsigned int maybe_archive : 1;

  /* 1 means this file was specified in a -l:namespec option.  */
  unsigned int full_name_provided : 1;

  /* 1 means search a set of directories for this file.  */
  unsigned int search_dirs : 1;

  /* 1 means this was found when processing a script in the sysroot.  */
  unsigned int sysrooted : 1;

  /* 1 means this is base file of incremental load.
     Do not load this file's text or data.
     Also default text_start to after this file's bss.  */
  unsigned int just_syms : 1;

  /* Whether to search for this entry as a dynamic archive.  */
  unsigned int dynamic : 1;

  /* Set if a DT_NEEDED tag should be added not just for the dynamic library
     explicitly given by this entry but also for any dynamic libraries in
     this entry's needed list.  */
  unsigned int add_DT_NEEDED_for_dynamic : 1;

  /* Set if this entry should cause a DT_NEEDED tag only when some
     regular file references its symbols (ie. --as-needed is in effect).  */
  unsigned int add_DT_NEEDED_for_regular : 1;

  /* Whether to include the entire contents of an archive.  */
  unsigned int whole_archive : 1;

  /* Set when bfd opening is successful.  */
  unsigned int loaded : 1;

  unsigned int real : 1;

  /* Set if the file does not exist.  */
  unsigned int missing_file : 1;

  /* Set if reloading an archive or --as-needed lib.  */
  unsigned int reload : 1;

#ifdef ENABLE_PLUGINS
  /* Set if the file was claimed by a plugin.  */
  unsigned int claimed : 1;

  /* Set if the file was claimed from an archive.  */
  unsigned int claim_archive : 1;

  /* Set if added by the lto plugin add_input_file callback.  */
  unsigned int lto_output : 1;
#endif /* ENABLE_PLUGINS */

  /* Head of list of pushed flags.  */
  struct lang_input_statement_flags *pushed;
};

typedef struct lang_input_statement_struct
{
  lang_statement_header_type header;
  /* Name of this file.  */
  const char *filename;
  /* Name to use for the symbol giving address of text start.
     Usually the same as filename, but for a file spec'd with
     -l this is the -l switch itself rather than the filename.  */
  const char *local_sym_name;

  bfd *the_bfd;

  struct flag_info *section_flag_list;

  /* Point to the next file - whatever it is, wanders up and down
     archives */
  union lang_statement_union *next;

  /* Point to the next file, but skips archive contents.  */
  union lang_statement_union *next_real_file;

  const char *target;

  struct lang_input_statement_flags flags;
} lang_input_statement_type;

typedef struct
{
  lang_statement_header_type header;
  asection *section;
} lang_input_section_type;

struct map_symbol_def {
  struct bfd_link_hash_entry *entry;
  struct map_symbol_def *next;
};

/* For input sections, when writing a map file: head / tail of a linked
   list of hash table entries for symbols defined in this section.  */
typedef struct input_section_userdata_struct
{
  struct map_symbol_def *map_symbol_def_head;
  struct map_symbol_def **map_symbol_def_tail;
  unsigned long map_symbol_def_count;
} input_section_userdata_type;

#define get_userdata(x) ((x)->userdata)


typedef struct lang_wild_statement_struct lang_wild_statement_type;

typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *,
			    asection *, struct flag_info *,
			    lang_input_statement_type *, void *);

typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *,
					     lang_input_statement_type *,
					     callback_t callback,
					     void *data);

typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *,
						 bfd *, const asection *);

/* Binary search tree structure to efficiently sort sections by
   name.  */
typedef struct lang_section_bst
{
  asection *section;
  struct lang_section_bst *left;
  struct lang_section_bst *right;
} lang_section_bst_type;

struct lang_wild_statement_struct
{
  lang_statement_header_type header;
  const char *filename;
  bfd_boolean filenames_sorted;
  struct wildcard_list *section_list;
  bfd_boolean keep_sections;
  lang_statement_list_type children;

  walk_wild_section_handler_t walk_wild_section_handler;
  struct wildcard_list *handler_data[4];
  lang_section_bst_type *tree;
  struct flag_info *section_flag_list;
};

typedef struct lang_address_statement_struct
{
  lang_statement_header_type header;
  const char *section_name;
  union etree_union *address;
  const segment_type *segment;
} lang_address_statement_type;

typedef struct
{
  lang_statement_header_type header;
  bfd_vma output_offset;
  bfd_size_type size;
  asection *output_section;
  fill_type *fill;
} lang_padding_statement_type;

/* A group statement collects a set of libraries together.  The
   libraries are searched multiple times, until no new undefined
   symbols are found.  The effect is to search a group of libraries as
   though they were a single library.  */

typedef struct
{
  lang_statement_header_type header;
  lang_statement_list_type children;
} lang_group_statement_type;

typedef struct
{
  lang_statement_header_type header;
  const char *where;
  bfd_boolean is_before;
} lang_insert_statement_type;

typedef union lang_statement_union
{
  lang_statement_header_type header;
  lang_wild_statement_type wild_statement;
  lang_data_statement_type data_statement;
  lang_reloc_statement_type reloc_statement;
  lang_address_statement_type address_statement;
  lang_output_section_statement_type output_section_statement;
  lang_assignment_statement_type assignment_statement;
  lang_input_statement_type input_statement;
  lang_target_statement_type target_statement;
  lang_output_statement_type output_statement;
  lang_input_section_type input_section;
  lang_common_statement_type common_statement;
  lang_object_symbols_statement_type object_symbols_statement;
  lang_fill_statement_type fill_statement;
  lang_padding_statement_type padding_statement;
  lang_group_statement_type group_statement;
  lang_insert_statement_type insert_statement;
} lang_statement_union_type;

/* This structure holds information about a program header, from the
   PHDRS command in the linker script.  */

struct lang_phdr
{
  struct lang_phdr *next;
  const char *name;
  unsigned long type;
  bfd_boolean filehdr;
  bfd_boolean phdrs;
  etree_type *at;
  etree_type *flags;
};

/* This structure is used to hold a list of sections which may not
   cross reference each other.  */

typedef struct lang_nocrossref
{
  struct lang_nocrossref *next;
  const char *name;
} lang_nocrossref_type;

/* The list of nocrossref lists.  */

struct lang_nocrossrefs
{
  struct lang_nocrossrefs *next;
  lang_nocrossref_type *list;
};

/* This structure is used to hold a list of input section names which
   will not match an output section in the linker script.  */

struct unique_sections
{
  struct unique_sections *next;
  const char *name;
};

/* Used by place_orphan to keep track of orphan sections and statements.  */

struct orphan_save
{
  const char *name;
  flagword flags;
  lang_output_section_statement_type *os;
  asection **section;
  lang_statement_union_type **stmt;
  lang_output_section_statement_type **os_tail;
};

struct asneeded_minfo
{
  struct asneeded_minfo *next;
  const char *soname;
  bfd *ref;
  const char *name;
};

extern struct lang_phdr *lang_phdr_list;
extern struct lang_nocrossrefs *nocrossref_list;
extern const char *output_target;
extern lang_output_section_statement_type *abs_output_section;
extern lang_statement_list_type lang_output_section_statement;
extern struct lang_input_statement_flags input_flags;
extern bfd_boolean lang_has_input_file;
extern lang_statement_list_type *stat_ptr;
extern bfd_boolean delete_output_file_on_failure;

extern struct bfd_sym_chain entry_symbol;
extern const char *entry_section;
extern bfd_boolean entry_from_cmdline;
extern lang_statement_list_type file_chain;
extern lang_statement_list_type input_file_chain;

extern int lang_statement_iteration;
extern struct asneeded_minfo **asneeded_list_tail;

extern void (*output_bfd_hash_table_free_fn) (struct bfd_link_hash_table *);

extern void lang_init
  (void);
extern void lang_finish
  (void);
extern lang_memory_region_type * lang_memory_region_lookup
  (const char * const, bfd_boolean);
extern void lang_memory_region_alias
  (const char *, const char *);
extern void lang_map
  (void);
extern void lang_set_flags
  (lang_memory_region_type *, const char *, int);
extern void lang_add_output
  (const char *, int from_script);
extern lang_output_section_statement_type *lang_enter_output_section_statement
  (const char *, etree_type *, enum section_type, etree_type *, etree_type *,
   etree_type *, int, int);
extern void lang_final
  (void);
extern void lang_relax_sections
  (bfd_boolean);
extern void lang_process
  (void);
extern void lang_section_start
  (const char *, union etree_union *, const segment_type *);
extern void lang_add_entry
  (const char *, bfd_boolean);
extern void lang_default_entry
  (const char *);
extern void lang_add_target
  (const char *);
extern void lang_add_wild
  (struct wildcard_spec *, struct wildcard_list *, bfd_boolean);
extern void lang_add_map
  (const char *);
extern void lang_add_fill
  (fill_type *);
extern lang_assignment_statement_type *lang_add_assignment
  (union etree_union *);
extern void lang_add_attribute
  (enum statement_enum);
extern void lang_startup
  (const char *);
extern void lang_float
  (bfd_boolean);
extern void lang_leave_output_section_statement
  (fill_type *, const char *, lang_output_section_phdr_list *,
   const char *);
extern void lang_statement_append
  (lang_statement_list_type *, lang_statement_union_type *,
   lang_statement_union_type **);
extern void lang_for_each_input_file
  (void (*dothis) (lang_input_statement_type *));
extern void lang_for_each_file
  (void (*dothis) (lang_input_statement_type *));
extern void lang_reset_memory_regions
  (void);
extern void lang_do_assignments
  (lang_phase_type);
extern asection *section_for_dot
  (void);

#define LANG_FOR_EACH_INPUT_STATEMENT(statement)			\
  lang_input_statement_type *statement;					\
  for (statement = (lang_input_statement_type *) file_chain.head;	\
       statement != (lang_input_statement_type *) NULL;			\
       statement = (lang_input_statement_type *) statement->next)	\

#define lang_output_section_find(NAME) \
  lang_output_section_statement_lookup (NAME, 0, FALSE)

extern void lang_process
  (void);
extern void ldlang_add_file
  (lang_input_statement_type *);
extern lang_output_section_statement_type *lang_output_section_find_by_flags
  (const asection *, lang_output_section_statement_type **,
   lang_match_sec_type_func);
extern lang_output_section_statement_type *lang_insert_orphan
  (asection *, const char *, int, lang_output_section_statement_type *,
   struct orphan_save *, etree_type *, lang_statement_list_type *);
extern lang_input_statement_type *lang_add_input_file
  (const char *, lang_input_file_enum_type, const char *);
extern void lang_add_keepsyms_file
  (const char *);
extern lang_output_section_statement_type *lang_output_section_get
  (const asection *);
extern lang_output_section_statement_type *lang_output_section_statement_lookup
  (const char *, int, bfd_boolean);
extern lang_output_section_statement_type *next_matching_output_section_statement
  (lang_output_section_statement_type *, int);
extern void ldlang_add_undef
  (const char *const, bfd_boolean);
extern void lang_add_output_format
  (const char *, const char *, const char *, int);
extern void lang_list_init
  (lang_statement_list_type *);
extern void push_stat_ptr
  (lang_statement_list_type *);
extern void pop_stat_ptr
  (void);
extern void lang_add_data
  (int type, union etree_union *);
extern void lang_add_reloc
  (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *,
   union etree_union *);
extern void lang_for_each_statement
  (void (*) (lang_statement_union_type *));
extern void lang_for_each_statement_worker
  (void (*) (lang_statement_union_type *), lang_statement_union_type *);
extern void *stat_alloc
  (size_t);
extern void strip_excluded_output_sections
  (void);
extern void lang_clear_os_map
  (void);
extern void dprint_statement
  (lang_statement_union_type *, int);
extern void lang_size_sections
  (bfd_boolean *, bfd_boolean);
extern void one_lang_size_sections_pass
  (bfd_boolean *, bfd_boolean);
extern void lang_add_insert
  (const char *, int);
extern void lang_enter_group
  (void);
extern void lang_leave_group
  (void);
extern void lang_add_section
  (lang_statement_list_type *, asection *,
   struct flag_info *, lang_output_section_statement_type *);
extern void lang_new_phdr
  (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *,
   etree_type *);
extern void lang_add_nocrossref
  (lang_nocrossref_type *);
extern void lang_enter_overlay
  (etree_type *, etree_type *);
extern void lang_enter_overlay_section
  (const char *);
extern void lang_leave_overlay_section
  (fill_type *, lang_output_section_phdr_list *);
extern void lang_leave_overlay
  (etree_type *, int, fill_type *, const char *,
   lang_output_section_phdr_list *, const char *);

extern struct bfd_elf_version_expr *lang_new_vers_pattern
  (struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean);
extern struct bfd_elf_version_tree *lang_new_vers_node
  (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *);
extern struct bfd_elf_version_deps *lang_add_vers_depend
  (struct bfd_elf_version_deps *, const char *);
extern void lang_register_vers_node
  (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *);
extern void lang_append_dynamic_list (struct bfd_elf_version_expr *);
extern void lang_append_dynamic_list_cpp_typeinfo (void);
extern void lang_append_dynamic_list_cpp_new (void);
extern void lang_add_unique
  (const char *);
extern const char *lang_get_output_target
  (void);
extern void add_excluded_libs (const char *);
extern bfd_boolean load_symbols
  (lang_input_statement_type *, lang_statement_list_type *);

extern bfd_boolean
ldlang_override_segment_assignment
  (struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean);

extern void
lang_ld_feature (char *);

#endif