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
;
133 struct lang_output_section_statement_struct
*prev
;
135 asection
*bfd_section
;
136 lang_memory_region_type
*region
;
137 lang_memory_region_type
*lma_region
;
139 union etree_union
*addr_tree
;
140 union etree_union
*load_base
;
142 /* If non-null, an expression to evaluate after setting the section's
143 size. The expression is evaluated inside REGION (above) with '.'
144 set to the end of the section. Used in the last overlay section
145 to move '.' past all the overlaid sections. */
146 union etree_union
*update_dot_tree
;
148 lang_output_section_phdr_list
*phdrs
;
150 unsigned int block_value
;
151 int subsection_alignment
; /* Alignment of components. */
152 int section_alignment
; /* Alignment of start of section. */
155 enum section_type sectype
;
156 unsigned int processed
: 1;
157 unsigned int all_input_readonly
: 1;
158 unsigned int ignored
: 1;
159 } lang_output_section_statement_type
;
163 lang_statement_header_type header
;
164 } lang_common_statement_type
;
168 lang_statement_header_type header
;
169 } lang_object_symbols_statement_type
;
173 lang_statement_header_type header
;
176 asection
*output_section
;
177 } lang_fill_statement_type
;
181 lang_statement_header_type header
;
183 union etree_union
*exp
;
185 asection
*output_section
;
186 bfd_vma output_offset
;
187 } lang_data_statement_type
;
189 /* Generate a reloc in the output file. */
193 lang_statement_header_type header
;
195 /* Reloc to generate. */
196 bfd_reloc_code_real_type reloc
;
198 /* Reloc howto structure. */
199 reloc_howto_type
*howto
;
201 /* Section to generate reloc against.
202 Exactly one of section and name must be NULL. */
205 /* Name of symbol to generate reloc against.
206 Exactly one of section and name must be NULL. */
209 /* Expression for addend. */
210 union etree_union
*addend_exp
;
212 /* Resolved addend. */
213 bfd_vma addend_value
;
215 /* Output section where reloc should be performed. */
216 asection
*output_section
;
218 /* Offset within output section. */
219 bfd_vma output_offset
;
220 } lang_reloc_statement_type
;
222 typedef struct lang_input_statement_struct
224 lang_statement_header_type header
;
225 /* Name of this file. */
226 const char *filename
;
227 /* Name to use for the symbol giving address of text start.
228 Usually the same as filename, but for a file spec'd with
229 -l this is the -l switch itself rather than the filename. */
230 const char *local_sym_name
;
235 file_ptr passive_position
;
237 /* Symbol table of the file. */
239 unsigned int symbol_count
;
241 /* Point to the next file - whatever it is, wanders up and down
243 union lang_statement_union
*next
;
245 /* Point to the next file, but skips archive contents. */
246 union lang_statement_union
*next_real_file
;
248 bfd_boolean is_archive
;
250 /* 1 means search a set of directories for this file. */
251 bfd_boolean search_dirs_flag
;
253 /* 1 means this was found in a search directory marked as sysrooted,
254 if search_dirs_flag is false, otherwise, that it should be
255 searched in ld_sysroot before any other location, as long as it
256 starts with a slash. */
257 bfd_boolean sysrooted
;
259 /* 1 means this is base file of incremental load.
260 Do not load this file's text or data.
261 Also default text_start to after this file's bss. */
262 bfd_boolean just_syms_flag
;
264 /* Whether to search for this entry as a dynamic archive. */
267 /* Whether DT_NEEDED tags should be added for dynamic libraries in
268 DT_NEEDED tags from this entry. */
269 bfd_boolean add_needed
;
271 /* Whether this entry should cause a DT_NEEDED tag only when
272 satisfying references from regular files, or always. */
273 bfd_boolean as_needed
;
275 /* Whether to include the entire contents of an archive. */
276 bfd_boolean whole_archive
;
282 } lang_input_statement_type
;
286 lang_statement_header_type header
;
288 } lang_input_section_type
;
292 lang_statement_header_type header
;
294 union lang_statement_union
*file
;
295 } lang_afile_asection_pair_statement_type
;
297 typedef struct lang_wild_statement_struct lang_wild_statement_type
;
299 typedef void (*callback_t
) (lang_wild_statement_type
*, struct wildcard_list
*,
300 asection
*, lang_input_statement_type
*, void *);
302 typedef void (*walk_wild_section_handler_t
) (lang_wild_statement_type
*,
303 lang_input_statement_type
*,
307 struct lang_wild_statement_struct
309 lang_statement_header_type header
;
310 const char *filename
;
311 bfd_boolean filenames_sorted
;
312 struct wildcard_list
*section_list
;
313 bfd_boolean keep_sections
;
314 lang_statement_list_type children
;
316 walk_wild_section_handler_t walk_wild_section_handler
;
317 struct wildcard_list
*handler_data
[4];
320 typedef struct lang_address_statement_struct
322 lang_statement_header_type header
;
323 const char *section_name
;
324 union etree_union
*address
;
325 const segment_type
*segment
;
326 } lang_address_statement_type
;
330 lang_statement_header_type header
;
331 bfd_vma output_offset
;
333 asection
*output_section
;
335 } lang_padding_statement_type
;
337 /* A group statement collects a set of libraries together. The
338 libraries are searched multiple times, until no new undefined
339 symbols are found. The effect is to search a group of libraries as
340 though they were a single library. */
344 lang_statement_header_type header
;
345 lang_statement_list_type children
;
346 } lang_group_statement_type
;
348 typedef union lang_statement_union
350 lang_statement_header_type header
;
351 lang_wild_statement_type wild_statement
;
352 lang_data_statement_type data_statement
;
353 lang_reloc_statement_type reloc_statement
;
354 lang_address_statement_type address_statement
;
355 lang_output_section_statement_type output_section_statement
;
356 lang_afile_asection_pair_statement_type afile_asection_pair_statement
;
357 lang_assignment_statement_type assignment_statement
;
358 lang_input_statement_type input_statement
;
359 lang_target_statement_type target_statement
;
360 lang_output_statement_type output_statement
;
361 lang_input_section_type input_section
;
362 lang_common_statement_type common_statement
;
363 lang_object_symbols_statement_type object_symbols_statement
;
364 lang_fill_statement_type fill_statement
;
365 lang_padding_statement_type padding_statement
;
366 lang_group_statement_type group_statement
;
367 } lang_statement_union_type
;
369 /* This structure holds information about a program header, from the
370 PHDRS command in the linker script. */
374 struct lang_phdr
*next
;
383 /* This structure is used to hold a list of sections which may not
384 cross reference each other. */
386 typedef struct lang_nocrossref
388 struct lang_nocrossref
*next
;
390 } lang_nocrossref_type
;
392 /* The list of nocrossref lists. */
394 struct lang_nocrossrefs
396 struct lang_nocrossrefs
*next
;
397 lang_nocrossref_type
*list
;
400 extern struct lang_nocrossrefs
*nocrossref_list
;
402 /* This structure is used to hold a list of input section names which
403 will not match an output section in the linker script. */
405 struct unique_sections
407 struct unique_sections
*next
;
411 /* This structure records symbols for which we need to keep track of
412 definedness for use in the DEFINED () test. */
414 struct lang_definedness_hash_entry
416 struct bfd_hash_entry root
;
420 /* Used by place_orphan to keep track of orphan sections and statements. */
425 lang_output_section_statement_type
*os
;
427 lang_statement_union_type
**stmt
;
428 lang_output_section_statement_type
**os_tail
;
431 extern lang_output_section_statement_type
*abs_output_section
;
432 extern lang_statement_list_type lang_output_section_statement
;
433 extern bfd_boolean lang_has_input_file
;
434 extern etree_type
*base
;
435 extern lang_statement_list_type
*stat_ptr
;
436 extern bfd_boolean delete_output_file_on_failure
;
438 extern struct bfd_sym_chain entry_symbol
;
439 extern const char *entry_section
;
440 extern bfd_boolean entry_from_cmdline
;
441 extern lang_statement_list_type file_chain
;
443 extern int lang_statement_iteration
;
445 extern void lang_init
447 extern void lang_finish
449 extern lang_memory_region_type
*lang_memory_region_lookup
450 (const char *const, bfd_boolean
);
451 extern lang_memory_region_type
*lang_memory_region_default
455 extern void lang_set_flags
456 (lang_memory_region_type
*, const char *, int);
457 extern void lang_add_output
458 (const char *, int from_script
);
459 extern lang_output_section_statement_type
*lang_enter_output_section_statement
460 (const char *output_section_statement_name
,
461 etree_type
*address_exp
,
462 enum section_type sectype
,
464 etree_type
*subalign
,
466 extern void lang_final
468 extern void lang_process
470 extern void lang_section_start
471 (const char *, union etree_union
*, const segment_type
*);
472 extern void lang_add_entry
473 (const char *, bfd_boolean
);
474 extern void lang_default_entry
476 extern void lang_add_target
478 extern void lang_add_wild
479 (struct wildcard_spec
*, struct wildcard_list
*, bfd_boolean
);
480 extern void lang_add_map
482 extern void lang_add_fill
484 extern lang_assignment_statement_type
*lang_add_assignment
485 (union etree_union
*);
486 extern void lang_add_attribute
487 (enum statement_enum
);
488 extern void lang_startup
490 extern void lang_float
492 extern void lang_leave_output_section_statement
493 (fill_type
*, const char *, lang_output_section_phdr_list
*,
495 extern void lang_abs_symbol_at_end_of
496 (const char *, const char *);
497 extern void lang_abs_symbol_at_beginning_of
498 (const char *, const char *);
499 extern void lang_statement_append
500 (lang_statement_list_type
*, lang_statement_union_type
*,
501 lang_statement_union_type
**);
502 extern void lang_for_each_input_file
503 (void (*dothis
) (lang_input_statement_type
*));
504 extern void lang_for_each_file
505 (void (*dothis
) (lang_input_statement_type
*));
506 extern void lang_reset_memory_regions
508 extern void lang_do_assignments
511 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \
512 lang_input_statement_type *statement; \
513 for (statement = (lang_input_statement_type *) file_chain.head; \
514 statement != (lang_input_statement_type *) NULL; \
515 statement = (lang_input_statement_type *) statement->next) \
517 extern void lang_process
519 extern void ldlang_add_file
520 (lang_input_statement_type
*);
521 extern lang_output_section_statement_type
*lang_output_section_find
522 (const char * const);
523 extern lang_output_section_statement_type
*lang_output_section_find_by_flags
524 (const asection
*, lang_output_section_statement_type
**exact
);
525 extern lang_output_section_statement_type
*lang_insert_orphan
526 (asection
*, const char *, lang_output_section_statement_type
*,
527 struct orphan_save
*, etree_type
*, lang_statement_list_type
*);
528 extern lang_input_statement_type
*lang_add_input_file
529 (const char *, lang_input_file_enum_type
, const char *);
530 extern void lang_add_keepsyms_file
532 extern lang_output_section_statement_type
*
533 lang_output_section_statement_lookup
535 extern void ldlang_add_undef
537 extern void lang_add_output_format
538 (const char *, const char *, const char *, int);
539 extern void lang_list_init
540 (lang_statement_list_type
*);
541 extern void lang_add_data
542 (int type
, union etree_union
*);
543 extern void lang_add_reloc
544 (bfd_reloc_code_real_type
, reloc_howto_type
*, asection
*, const char *,
545 union etree_union
*);
546 extern void lang_for_each_statement
547 (void (*) (lang_statement_union_type
*));
548 extern void *stat_alloc
550 extern void strip_excluded_output_sections
552 extern void dprint_statement
553 (lang_statement_union_type
*, int);
554 extern void lang_size_sections
555 (bfd_boolean
*, bfd_boolean
);
556 extern void one_lang_size_sections_pass
557 (bfd_boolean
*, bfd_boolean
);
558 extern void lang_enter_group
560 extern void lang_leave_group
562 extern void lang_add_section
563 (lang_statement_list_type
*, asection
*,
564 lang_output_section_statement_type
*);
565 extern void lang_new_phdr
566 (const char *, etree_type
*, bfd_boolean
, bfd_boolean
, etree_type
*,
568 extern void lang_add_nocrossref
569 (lang_nocrossref_type
*);
570 extern void lang_enter_overlay
571 (etree_type
*, etree_type
*);
572 extern void lang_enter_overlay_section
574 extern void lang_leave_overlay_section
575 (fill_type
*, lang_output_section_phdr_list
*);
576 extern void lang_leave_overlay
577 (etree_type
*, int, fill_type
*, const char *,
578 lang_output_section_phdr_list
*, const char *);
580 extern struct bfd_elf_version_tree
*lang_elf_version_info
;
582 extern struct bfd_elf_version_expr
*lang_new_vers_pattern
583 (struct bfd_elf_version_expr
*, const char *, const char *, bfd_boolean
);
584 extern struct bfd_elf_version_tree
*lang_new_vers_node
585 (struct bfd_elf_version_expr
*, struct bfd_elf_version_expr
*);
586 extern struct bfd_elf_version_deps
*lang_add_vers_depend
587 (struct bfd_elf_version_deps
*, const char *);
588 extern void lang_register_vers_node
589 (const char *, struct bfd_elf_version_tree
*, struct bfd_elf_version_deps
*);
590 bfd_boolean unique_section_p
592 extern void lang_add_unique
594 extern const char *lang_get_output_target
596 extern void lang_track_definedness (const char *);
597 extern int lang_symbol_definition_iteration (const char *);
598 extern void lang_update_definedness
599 (const char *, struct bfd_link_hash_entry
*);
601 extern void add_excluded_libs (const char *);