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_section_type;
291 lang_statement_header_type header;
293 union lang_statement_union *file;
294 } lang_afile_asection_pair_statement_type;
296 typedef struct lang_wild_statement_struct lang_wild_statement_type;
298 typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *,
299 asection *, lang_input_statement_type *, void *);
301 typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *,
302 lang_input_statement_type *,
306 typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *,
307 bfd *, const asection *);
309 struct lang_wild_statement_struct
311 lang_statement_header_type header;
312 const char *filename;
313 bfd_boolean filenames_sorted;
314 struct wildcard_list *section_list;
315 bfd_boolean keep_sections;
316 lang_statement_list_type children;
318 walk_wild_section_handler_t walk_wild_section_handler;
319 struct wildcard_list *handler_data[4];
322 typedef struct lang_address_statement_struct
324 lang_statement_header_type header;
325 const char *section_name;
326 union etree_union *address;
327 const segment_type *segment;
328 } lang_address_statement_type;
332 lang_statement_header_type header;
333 bfd_vma output_offset;
335 asection *output_section;
337 } lang_padding_statement_type;
339 /* A group statement collects a set of libraries together. The
340 libraries are searched multiple times, until no new undefined
341 symbols are found. The effect is to search a group of libraries as
342 though they were a single library. */
346 lang_statement_header_type header;
347 lang_statement_list_type children;
348 } lang_group_statement_type;
350 typedef union lang_statement_union
352 lang_statement_header_type header;
353 lang_wild_statement_type wild_statement;
354 lang_data_statement_type data_statement;
355 lang_reloc_statement_type reloc_statement;
356 lang_address_statement_type address_statement;
357 lang_output_section_statement_type output_section_statement;
358 lang_afile_asection_pair_statement_type afile_asection_pair_statement;
359 lang_assignment_statement_type assignment_statement;
360 lang_input_statement_type input_statement;
361 lang_target_statement_type target_statement;
362 lang_output_statement_type output_statement;
363 lang_input_section_type input_section;
364 lang_common_statement_type common_statement;
365 lang_object_symbols_statement_type object_symbols_statement;
366 lang_fill_statement_type fill_statement;
367 lang_padding_statement_type padding_statement;
368 lang_group_statement_type group_statement;
369 } lang_statement_union_type;
371 /* This structure holds information about a program header, from the
372 PHDRS command in the linker script. */
376 struct lang_phdr *next;
385 /* This structure is used to hold a list of sections which may not
386 cross reference each other. */
388 typedef struct lang_nocrossref
390 struct lang_nocrossref *next;
392 } lang_nocrossref_type;
394 /* The list of nocrossref lists. */
396 struct lang_nocrossrefs
398 struct lang_nocrossrefs *next;
399 lang_nocrossref_type *list;
402 extern struct lang_nocrossrefs *nocrossref_list;
404 /* This structure is used to hold a list of input section names which
405 will not match an output section in the linker script. */
407 struct unique_sections
409 struct unique_sections *next;
413 /* This structure records symbols for which we need to keep track of
414 definedness for use in the DEFINED () test. */
416 struct lang_definedness_hash_entry
418 struct bfd_hash_entry root;
422 /* Used by place_orphan to keep track of orphan sections and statements. */
427 lang_output_section_statement_type *os;
429 lang_statement_union_type **stmt;
430 lang_output_section_statement_type **os_tail;
433 extern lang_output_section_statement_type *abs_output_section;
434 extern lang_statement_list_type lang_output_section_statement;
435 extern bfd_boolean lang_has_input_file;
436 extern etree_type *base;
437 extern lang_statement_list_type *stat_ptr;
438 extern bfd_boolean delete_output_file_on_failure;
440 extern struct bfd_sym_chain entry_symbol;
441 extern const char *entry_section;
442 extern bfd_boolean entry_from_cmdline;
443 extern lang_statement_list_type file_chain;
445 extern int lang_statement_iteration;
447 extern void lang_init
449 extern void lang_finish
451 extern lang_memory_region_type *lang_memory_region_lookup
452 (const char *const, bfd_boolean);
453 extern lang_memory_region_type *lang_memory_region_default
457 extern void lang_set_flags
458 (lang_memory_region_type *, const char *, int);
459 extern void lang_add_output
460 (const char *, int from_script);
461 extern lang_output_section_statement_type *lang_enter_output_section_statement
462 (const char *output_section_statement_name,
463 etree_type *address_exp,
464 enum section_type sectype,
466 etree_type *subalign,
468 extern void lang_final
470 extern void lang_process
472 extern void lang_section_start
473 (const char *, union etree_union *, const segment_type *);
474 extern void lang_add_entry
475 (const char *, bfd_boolean);
476 extern void lang_default_entry
478 extern void lang_add_target
480 extern void lang_add_wild
481 (struct wildcard_spec *, struct wildcard_list *, bfd_boolean);
482 extern void lang_add_map
484 extern void lang_add_fill
486 extern lang_assignment_statement_type *lang_add_assignment
487 (union etree_union *);
488 extern void lang_add_attribute
489 (enum statement_enum);
490 extern void lang_startup
492 extern void lang_float
494 extern void lang_leave_output_section_statement
495 (fill_type *, const char *, lang_output_section_phdr_list *,
497 extern void lang_abs_symbol_at_end_of
498 (const char *, const char *);
499 extern void lang_abs_symbol_at_beginning_of
500 (const char *, const char *);
501 extern void lang_statement_append
502 (lang_statement_list_type *, lang_statement_union_type *,
503 lang_statement_union_type **);
504 extern void lang_for_each_input_file
505 (void (*dothis) (lang_input_statement_type *));
506 extern void lang_for_each_file
507 (void (*dothis) (lang_input_statement_type *));
508 extern void lang_reset_memory_regions
510 extern void lang_do_assignments
513 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \
514 lang_input_statement_type *statement; \
515 for (statement = (lang_input_statement_type *) file_chain.head; \
516 statement != (lang_input_statement_type *) NULL; \
517 statement = (lang_input_statement_type *) statement->next) \
519 extern void lang_process
521 extern void ldlang_add_file
522 (lang_input_statement_type *);
523 extern lang_output_section_statement_type *lang_output_section_find
524 (const char * const);
525 extern lang_output_section_statement_type *lang_output_section_find_by_flags
526 (const asection *, lang_output_section_statement_type **,
527 lang_match_sec_type_func);
528 extern lang_output_section_statement_type *lang_insert_orphan
529 (asection *, const char *, lang_output_section_statement_type *,
530 struct orphan_save *, etree_type *, lang_statement_list_type *);
531 extern lang_input_statement_type *lang_add_input_file
532 (const char *, lang_input_file_enum_type, const char *);
533 extern void lang_add_keepsyms_file
535 extern lang_output_section_statement_type *
536 lang_output_section_statement_lookup
538 extern void ldlang_add_undef
540 extern void lang_add_output_format
541 (const char *, const char *, const char *, int);
542 extern void lang_list_init
543 (lang_statement_list_type *);
544 extern void lang_add_data
545 (int type, union etree_union *);
546 extern void lang_add_reloc
547 (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *,
548 union etree_union *);
549 extern void lang_for_each_statement
550 (void (*) (lang_statement_union_type *));
551 extern void *stat_alloc
553 extern void strip_excluded_output_sections
555 extern void dprint_statement
556 (lang_statement_union_type *, int);
557 extern void lang_size_sections
558 (bfd_boolean *, bfd_boolean);
559 extern void one_lang_size_sections_pass
560 (bfd_boolean *, bfd_boolean);
561 extern void lang_enter_group
563 extern void lang_leave_group
565 extern void lang_add_section
566 (lang_statement_list_type *, asection *,
567 lang_output_section_statement_type *);
568 extern void lang_new_phdr
569 (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *,
571 extern void lang_add_nocrossref
572 (lang_nocrossref_type *);
573 extern void lang_enter_overlay
574 (etree_type *, etree_type *);
575 extern void lang_enter_overlay_section
577 extern void lang_leave_overlay_section
578 (fill_type *, lang_output_section_phdr_list *);
579 extern void lang_leave_overlay
580 (etree_type *, int, fill_type *, const char *,
581 lang_output_section_phdr_list *, const char *);
583 extern struct bfd_elf_version_tree *lang_elf_version_info;
585 extern struct bfd_elf_version_expr *lang_new_vers_pattern
586 (struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean);
587 extern struct bfd_elf_version_tree *lang_new_vers_node
588 (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *);
589 extern struct bfd_elf_version_deps *lang_add_vers_depend
590 (struct bfd_elf_version_deps *, const char *);
591 extern void lang_register_vers_node
592 (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *);
593 bfd_boolean unique_section_p
595 extern void lang_add_unique
597 extern const char *lang_get_output_target
599 extern void lang_track_definedness (const char *);
600 extern int lang_symbol_definition_iteration (const char *);
601 extern void lang_update_definedness
602 (const char *, struct bfd_link_hash_entry *);
604 extern void add_excluded_libs (const char *);