1 /* ldlang.h - linker command language support
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005
4 Free Software Foundation, Inc.
6 This file is part of GLD, the Gnu Linker.
8 GLD 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 2, or (at your option)
13 GLD 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.
18 You should have received a copy of the GNU General Public License
19 along with GLD; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
26 #define DEFAULT_MEMORY_REGION "*default*"
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
;
41 unsigned char data
[1];
44 typedef struct statement_list
46 union lang_statement_union
*head
;
47 union lang_statement_union
**tail
;
48 } lang_statement_list_type
;
50 typedef struct memory_region_struct
53 struct memory_region_struct
*next
;
57 bfd_size_type old_length
;
60 bfd_boolean had_full_message
;
61 } lang_memory_region_type
;
63 typedef struct lang_statement_header_struct
65 union lang_statement_union
*next
;
68 lang_output_section_statement_enum
,
69 lang_assignment_statement_enum
,
70 lang_input_statement_enum
,
71 lang_address_statement_enum
,
72 lang_wild_statement_enum
,
73 lang_input_section_enum
,
74 lang_object_symbols_statement_enum
,
75 lang_fill_statement_enum
,
76 lang_data_statement_enum
,
77 lang_reloc_statement_enum
,
78 lang_target_statement_enum
,
79 lang_output_statement_enum
,
80 lang_padding_statement_enum
,
81 lang_group_statement_enum
,
83 lang_afile_asection_pair_statement_enum
,
84 lang_constructors_statement_enum
86 } lang_statement_header_type
;
90 lang_statement_header_type header
;
91 union etree_union
*exp
;
92 } lang_assignment_statement_type
;
94 typedef struct lang_target_statement_struct
96 lang_statement_header_type header
;
98 } lang_target_statement_type
;
100 typedef struct lang_output_statement_struct
102 lang_statement_header_type header
;
104 } lang_output_statement_type
;
106 /* Section types specified in a linker script. */
118 /* This structure holds a list of program headers describing
119 segments in which this section should be placed. */
121 typedef struct lang_output_section_phdr_list
123 struct lang_output_section_phdr_list
*next
;
126 } lang_output_section_phdr_list
;
128 typedef struct lang_output_section_statement_struct
130 lang_statement_header_type header
;
131 lang_statement_list_type children
;
132 struct lang_output_section_statement_struct
*next
;
134 asection
*bfd_section
;
135 lang_memory_region_type
*region
;
136 lang_memory_region_type
*lma_region
;
138 union etree_union
*addr_tree
;
139 union etree_union
*load_base
;
141 /* If non-null, an expression to evaluate after setting the section's
142 size. The expression is evaluated inside REGION (above) with '.'
143 set to the end of the section. Used in the last overlay section
144 to move '.' past all the overlaid sections. */
145 union etree_union
*update_dot_tree
;
147 lang_output_section_phdr_list
*phdrs
;
149 unsigned int block_value
;
150 int subsection_alignment
; /* Alignment of components. */
151 int section_alignment
; /* Alignment of start of section. */
154 enum section_type sectype
;
155 unsigned int processed
: 1;
156 unsigned int all_input_readonly
: 1;
157 unsigned int ignored
: 1;
158 } lang_output_section_statement_type
;
162 lang_statement_header_type header
;
163 } lang_common_statement_type
;
167 lang_statement_header_type header
;
168 } lang_object_symbols_statement_type
;
172 lang_statement_header_type header
;
175 asection
*output_section
;
176 } lang_fill_statement_type
;
180 lang_statement_header_type header
;
182 union etree_union
*exp
;
184 asection
*output_section
;
185 bfd_vma output_offset
;
186 } lang_data_statement_type
;
188 /* Generate a reloc in the output file. */
192 lang_statement_header_type header
;
194 /* Reloc to generate. */
195 bfd_reloc_code_real_type reloc
;
197 /* Reloc howto structure. */
198 reloc_howto_type
*howto
;
200 /* Section to generate reloc against.
201 Exactly one of section and name must be NULL. */
204 /* Name of symbol to generate reloc against.
205 Exactly one of section and name must be NULL. */
208 /* Expression for addend. */
209 union etree_union
*addend_exp
;
211 /* Resolved addend. */
212 bfd_vma addend_value
;
214 /* Output section where reloc should be performed. */
215 asection
*output_section
;
217 /* Offset within output section. */
218 bfd_vma output_offset
;
219 } lang_reloc_statement_type
;
221 typedef struct lang_input_statement_struct
223 lang_statement_header_type header
;
224 /* Name of this file. */
225 const char *filename
;
226 /* Name to use for the symbol giving address of text start.
227 Usually the same as filename, but for a file spec'd with
228 -l this is the -l switch itself rather than the filename. */
229 const char *local_sym_name
;
234 file_ptr passive_position
;
236 /* Symbol table of the file. */
238 unsigned int symbol_count
;
240 /* Point to the next file - whatever it is, wanders up and down
242 union lang_statement_union
*next
;
244 /* Point to the next file, but skips archive contents. */
245 union lang_statement_union
*next_real_file
;
247 bfd_boolean is_archive
;
249 /* 1 means search a set of directories for this file. */
250 bfd_boolean search_dirs_flag
;
252 /* 1 means this was found in a search directory marked as sysrooted,
253 if search_dirs_flag is false, otherwise, that it should be
254 searched in ld_sysroot before any other location, as long as it
255 starts with a slash. */
256 bfd_boolean sysrooted
;
258 /* 1 means this is base file of incremental load.
259 Do not load this file's text or data.
260 Also default text_start to after this file's bss. */
261 bfd_boolean just_syms_flag
;
263 /* Whether to search for this entry as a dynamic archive. */
266 /* Whether DT_NEEDED tags should be added for dynamic libraries in
267 DT_NEEDED tags from this entry. */
268 bfd_boolean add_needed
;
270 /* Whether this entry should cause a DT_NEEDED tag only when
271 satisfying references from regular files, or always. */
272 bfd_boolean as_needed
;
274 /* Whether to include the entire contents of an archive. */
275 bfd_boolean whole_archive
;
281 } lang_input_statement_type
;
285 lang_statement_header_type header
;
287 lang_input_statement_type
*ifile
;
289 } lang_input_section_type
;
293 lang_statement_header_type header
;
295 union lang_statement_union
*file
;
296 } lang_afile_asection_pair_statement_type
;
298 typedef struct lang_wild_statement_struct lang_wild_statement_type
;
300 typedef void (*callback_t
) (lang_wild_statement_type
*, struct wildcard_list
*,
301 asection
*, lang_input_statement_type
*, void *);
303 typedef void (*walk_wild_section_handler_t
) (lang_wild_statement_type
*,
304 lang_input_statement_type
*,
308 struct lang_wild_statement_struct
310 lang_statement_header_type header
;
311 const char *filename
;
312 bfd_boolean filenames_sorted
;
313 struct wildcard_list
*section_list
;
314 bfd_boolean keep_sections
;
315 lang_statement_list_type children
;
317 walk_wild_section_handler_t walk_wild_section_handler
;
318 struct wildcard_list
*handler_data
[4];
321 typedef struct lang_address_statement_struct
323 lang_statement_header_type header
;
324 const char *section_name
;
325 union etree_union
*address
;
326 const segment_type
*segment
;
327 } lang_address_statement_type
;
331 lang_statement_header_type header
;
332 bfd_vma output_offset
;
334 asection
*output_section
;
336 } lang_padding_statement_type
;
338 /* A group statement collects a set of libraries together. The
339 libraries are searched multiple times, until no new undefined
340 symbols are found. The effect is to search a group of libraries as
341 though they were a single library. */
345 lang_statement_header_type header
;
346 lang_statement_list_type children
;
347 } lang_group_statement_type
;
349 typedef union lang_statement_union
351 lang_statement_header_type header
;
352 lang_wild_statement_type wild_statement
;
353 lang_data_statement_type data_statement
;
354 lang_reloc_statement_type reloc_statement
;
355 lang_address_statement_type address_statement
;
356 lang_output_section_statement_type output_section_statement
;
357 lang_afile_asection_pair_statement_type afile_asection_pair_statement
;
358 lang_assignment_statement_type assignment_statement
;
359 lang_input_statement_type input_statement
;
360 lang_target_statement_type target_statement
;
361 lang_output_statement_type output_statement
;
362 lang_input_section_type input_section
;
363 lang_common_statement_type common_statement
;
364 lang_object_symbols_statement_type object_symbols_statement
;
365 lang_fill_statement_type fill_statement
;
366 lang_padding_statement_type padding_statement
;
367 lang_group_statement_type group_statement
;
368 } lang_statement_union_type
;
370 /* This structure holds information about a program header, from the
371 PHDRS command in the linker script. */
375 struct lang_phdr
*next
;
384 /* This structure is used to hold a list of sections which may not
385 cross reference each other. */
387 typedef struct lang_nocrossref
389 struct lang_nocrossref
*next
;
391 } lang_nocrossref_type
;
393 /* The list of nocrossref lists. */
395 struct lang_nocrossrefs
397 struct lang_nocrossrefs
*next
;
398 lang_nocrossref_type
*list
;
401 extern struct lang_nocrossrefs
*nocrossref_list
;
403 /* This structure is used to hold a list of input section names which
404 will not match an output section in the linker script. */
406 struct unique_sections
408 struct unique_sections
*next
;
412 /* This structure records symbols for which we need to keep track of
413 definedness for use in the DEFINED () test. */
415 struct lang_definedness_hash_entry
417 struct bfd_hash_entry root
;
421 /* Used by place_orphan to keep track of orphan sections and statements. */
426 lang_output_section_statement_type
*os
;
428 lang_statement_union_type
**stmt
;
429 lang_output_section_statement_type
**os_tail
;
432 extern lang_output_section_statement_type
*abs_output_section
;
433 extern lang_statement_list_type lang_output_section_statement
;
434 extern bfd_boolean lang_has_input_file
;
435 extern etree_type
*base
;
436 extern lang_statement_list_type
*stat_ptr
;
437 extern bfd_boolean delete_output_file_on_failure
;
439 extern struct bfd_sym_chain entry_symbol
;
440 extern const char *entry_section
;
441 extern bfd_boolean entry_from_cmdline
;
442 extern lang_statement_list_type file_chain
;
444 extern int lang_statement_iteration
;
446 extern void lang_init
448 extern void lang_finish
450 extern lang_memory_region_type
*lang_memory_region_lookup
451 (const char *const, bfd_boolean
);
452 extern lang_memory_region_type
*lang_memory_region_default
456 extern void lang_set_flags
457 (lang_memory_region_type
*, const char *, int);
458 extern void lang_add_output
459 (const char *, int from_script
);
460 extern lang_output_section_statement_type
*lang_enter_output_section_statement
461 (const char *output_section_statement_name
,
462 etree_type
*address_exp
,
463 enum section_type sectype
,
465 etree_type
*subalign
,
467 extern void lang_final
469 extern void lang_process
471 extern void lang_section_start
472 (const char *, union etree_union
*, const segment_type
*);
473 extern void lang_add_entry
474 (const char *, bfd_boolean
);
475 extern void lang_default_entry
477 extern void lang_add_target
479 extern void lang_add_wild
480 (struct wildcard_spec
*, struct wildcard_list
*, bfd_boolean
);
481 extern void lang_add_map
483 extern void lang_add_fill
485 extern lang_assignment_statement_type
*lang_add_assignment
486 (union etree_union
*);
487 extern void lang_add_attribute
488 (enum statement_enum
);
489 extern void lang_startup
491 extern void lang_float
493 extern void lang_leave_output_section_statement
494 (fill_type
*, const char *, lang_output_section_phdr_list
*,
496 extern void lang_abs_symbol_at_end_of
497 (const char *, const char *);
498 extern void lang_abs_symbol_at_beginning_of
499 (const char *, const char *);
500 extern void lang_statement_append
501 (lang_statement_list_type
*, lang_statement_union_type
*,
502 lang_statement_union_type
**);
503 extern void lang_for_each_input_file
504 (void (*dothis
) (lang_input_statement_type
*));
505 extern void lang_for_each_file
506 (void (*dothis
) (lang_input_statement_type
*));
507 extern void lang_reset_memory_regions
509 extern void lang_do_assignments
512 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \
513 lang_input_statement_type *statement; \
514 for (statement = (lang_input_statement_type *) file_chain.head; \
515 statement != (lang_input_statement_type *) NULL; \
516 statement = (lang_input_statement_type *) statement->next) \
518 extern void lang_process
520 extern void ldlang_add_file
521 (lang_input_statement_type
*);
522 extern lang_output_section_statement_type
*lang_output_section_find
523 (const char * const);
524 extern lang_output_section_statement_type
*lang_output_section_find_by_flags
525 (const asection
*, lang_output_section_statement_type
**exact
);
526 extern lang_output_section_statement_type
*lang_insert_orphan
527 (lang_input_statement_type
*, asection
*, const char *,
528 lang_output_section_statement_type
*, struct orphan_save
*,
529 etree_type
*, lang_statement_list_type
*);
530 extern lang_input_statement_type
*lang_add_input_file
531 (const char *, lang_input_file_enum_type
, const char *);
532 extern void lang_add_keepsyms_file
534 extern lang_output_section_statement_type
*
535 lang_output_section_statement_lookup
537 extern void ldlang_add_undef
539 extern void lang_add_output_format
540 (const char *, const char *, const char *, int);
541 extern void lang_list_init
542 (lang_statement_list_type
*);
543 extern void lang_add_data
544 (int type
, union etree_union
*);
545 extern void lang_add_reloc
546 (bfd_reloc_code_real_type
, reloc_howto_type
*, asection
*, const char *,
547 union etree_union
*);
548 extern void lang_for_each_statement
549 (void (*) (lang_statement_union_type
*));
550 extern void *stat_alloc
552 extern void strip_excluded_output_sections
554 extern void dprint_statement
555 (lang_statement_union_type
*, int);
556 extern void lang_size_sections
557 (bfd_boolean
*, bfd_boolean
);
558 extern void one_lang_size_sections_pass
559 (bfd_boolean
*, bfd_boolean
);
560 extern void lang_enter_group
562 extern void lang_leave_group
564 extern void lang_add_section
565 (lang_statement_list_type
*, asection
*,
566 lang_output_section_statement_type
*, lang_input_statement_type
*);
567 extern void lang_new_phdr
568 (const char *, etree_type
*, bfd_boolean
, bfd_boolean
, etree_type
*,
570 extern void lang_add_nocrossref
571 (lang_nocrossref_type
*);
572 extern void lang_enter_overlay
573 (etree_type
*, etree_type
*);
574 extern void lang_enter_overlay_section
576 extern void lang_leave_overlay_section
577 (fill_type
*, lang_output_section_phdr_list
*);
578 extern void lang_leave_overlay
579 (etree_type
*, int, fill_type
*, const char *,
580 lang_output_section_phdr_list
*, const char *);
582 extern struct bfd_elf_version_tree
*lang_elf_version_info
;
584 extern struct bfd_elf_version_expr
*lang_new_vers_pattern
585 (struct bfd_elf_version_expr
*, const char *, const char *, bfd_boolean
);
586 extern struct bfd_elf_version_tree
*lang_new_vers_node
587 (struct bfd_elf_version_expr
*, struct bfd_elf_version_expr
*);
588 extern struct bfd_elf_version_deps
*lang_add_vers_depend
589 (struct bfd_elf_version_deps
*, const char *);
590 extern void lang_register_vers_node
591 (const char *, struct bfd_elf_version_tree
*, struct bfd_elf_version_deps
*);
592 bfd_boolean unique_section_p
594 extern void lang_add_unique
596 extern const char *lang_get_output_target
598 extern void lang_track_definedness (const char *);
599 extern int lang_symbol_definition_iteration (const char *);
600 extern void lang_update_definedness
601 (const char *, struct bfd_link_hash_entry
*);
603 extern void add_excluded_libs (const char *);