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, 59 Temple Place - Suite 330, 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 union etree_union *addr_tree;
132 lang_statement_list_type children;
134 struct lang_output_section_statement_struct *next;
139 asection *bfd_section;
140 flagword flags; /* Or together of all input sections. */
141 enum section_type sectype;
142 lang_memory_region_type *region;
143 lang_memory_region_type *lma_region;
147 int subsection_alignment; /* Alignment of components. */
148 int section_alignment; /* Alignment of start of section. */
150 bfd_boolean all_input_readonly;
152 union etree_union *load_base;
154 /* If non-null, an expression to evaluate after setting the section's
155 size. The expression is evaluated inside REGION (above) with '.'
156 set to the end of the section. Used in the last overlay section
157 to move '.' past all the overlaid sections. */
158 union etree_union *update_dot_tree;
160 lang_output_section_phdr_list *phdrs;
161 } lang_output_section_statement_type;
165 lang_statement_header_type header;
166 } lang_common_statement_type;
170 lang_statement_header_type header;
171 } lang_object_symbols_statement_type;
175 lang_statement_header_type header;
178 asection *output_section;
179 } lang_fill_statement_type;
183 lang_statement_header_type header;
185 union etree_union *exp;
187 asection *output_section;
189 } lang_data_statement_type;
191 /* Generate a reloc in the output file. */
195 lang_statement_header_type header;
197 /* Reloc to generate. */
198 bfd_reloc_code_real_type reloc;
200 /* Reloc howto structure. */
201 reloc_howto_type *howto;
203 /* Section to generate reloc against.
204 Exactly one of section and name must be NULL. */
207 /* Name of symbol to generate reloc against.
208 Exactly one of section and name must be NULL. */
211 /* Expression for addend. */
212 union etree_union *addend_exp;
214 /* Resolved addend. */
215 bfd_vma addend_value;
217 /* Output section where reloc should be performed. */
218 asection *output_section;
220 /* VMA within output section. */
222 } lang_reloc_statement_type;
224 typedef struct lang_input_statement_struct
226 lang_statement_header_type header;
227 /* Name of this file. */
228 const char *filename;
229 /* Name to use for the symbol giving address of text start.
230 Usually the same as filename, but for a file spec'd with
231 -l this is the -l switch itself rather than the filename. */
232 const char *local_sym_name;
237 file_ptr passive_position;
239 /* Symbol table of the file. */
241 unsigned int symbol_count;
243 /* Point to the next file - whatever it is, wanders up and down
245 union lang_statement_union *next;
247 /* Point to the next file, but skips archive contents. */
248 union lang_statement_union *next_real_file;
250 bfd_boolean is_archive;
252 /* 1 means search a set of directories for this file. */
253 bfd_boolean search_dirs_flag;
255 /* 1 means this was found in a search directory marked as sysrooted,
256 if search_dirs_flag is false, otherwise, that it should be
257 searched in ld_sysroot before any other location, as long as it
258 starts with a slash. */
259 bfd_boolean sysrooted;
261 /* 1 means this is base file of incremental load.
262 Do not load this file's text or data.
263 Also default text_start to after this file's bss. */
264 bfd_boolean just_syms_flag;
266 /* Whether to search for this entry as a dynamic archive. */
269 /* Whether DT_NEEDED tags should be added for dynamic libraries in
270 DT_NEEDED tags from this entry. */
271 bfd_boolean add_needed;
273 /* Whether this entry should cause a DT_NEEDED tag only when
274 satisfying references from regular files, or always. */
275 bfd_boolean as_needed;
277 /* Whether to include the entire contents of an archive. */
278 bfd_boolean whole_archive;
284 } lang_input_statement_type;
288 lang_statement_header_type header;
290 lang_input_statement_type *ifile;
292 } lang_input_section_type;
296 lang_statement_header_type header;
298 union lang_statement_union *file;
299 } lang_afile_asection_pair_statement_type;
301 typedef struct lang_wild_statement_struct
303 lang_statement_header_type header;
304 const char *filename;
305 bfd_boolean filenames_sorted;
306 struct wildcard_list *section_list;
307 bfd_boolean keep_sections;
308 lang_statement_list_type children;
309 } lang_wild_statement_type;
311 typedef struct lang_address_statement_struct
313 lang_statement_header_type header;
314 const char *section_name;
315 union etree_union *address;
316 const segment_type *segment;
317 } lang_address_statement_type;
321 lang_statement_header_type header;
322 bfd_vma output_offset;
324 asection *output_section;
326 } lang_padding_statement_type;
328 /* A group statement collects a set of libraries together. The
329 libraries are searched multiple times, until no new undefined
330 symbols are found. The effect is to search a group of libraries as
331 though they were a single library. */
335 lang_statement_header_type header;
336 lang_statement_list_type children;
337 } lang_group_statement_type;
339 typedef union lang_statement_union
341 lang_statement_header_type header;
342 lang_wild_statement_type wild_statement;
343 lang_data_statement_type data_statement;
344 lang_reloc_statement_type reloc_statement;
345 lang_address_statement_type address_statement;
346 lang_output_section_statement_type output_section_statement;
347 lang_afile_asection_pair_statement_type afile_asection_pair_statement;
348 lang_assignment_statement_type assignment_statement;
349 lang_input_statement_type input_statement;
350 lang_target_statement_type target_statement;
351 lang_output_statement_type output_statement;
352 lang_input_section_type input_section;
353 lang_common_statement_type common_statement;
354 lang_object_symbols_statement_type object_symbols_statement;
355 lang_fill_statement_type fill_statement;
356 lang_padding_statement_type padding_statement;
357 lang_group_statement_type group_statement;
358 } lang_statement_union_type;
360 /* This structure holds information about a program header, from the
361 PHDRS command in the linker script. */
365 struct lang_phdr *next;
374 /* This structure is used to hold a list of sections which may not
375 cross reference each other. */
377 typedef struct lang_nocrossref
379 struct lang_nocrossref *next;
381 } lang_nocrossref_type;
383 /* The list of nocrossref lists. */
385 struct lang_nocrossrefs
387 struct lang_nocrossrefs *next;
388 lang_nocrossref_type *list;
391 extern struct lang_nocrossrefs *nocrossref_list;
393 /* This structure is used to hold a list of input section names which
394 will not match an output section in the linker script. */
396 struct unique_sections
398 struct unique_sections *next;
402 /* This structure records symbols for which we need to keep track of
403 definedness for use in the DEFINED () test. */
405 struct lang_definedness_hash_entry
407 struct bfd_hash_entry root;
411 /* Used by place_orphan to keep track of orphan sections and statements. */
416 lang_output_section_statement_type *os;
418 lang_statement_union_type **stmt;
419 lang_output_section_statement_type **os_tail;
422 extern struct unique_sections *unique_section_list;
424 extern lang_output_section_statement_type *abs_output_section;
425 extern lang_statement_list_type lang_output_section_statement;
426 extern bfd_boolean lang_has_input_file;
427 extern etree_type *base;
428 extern lang_statement_list_type *stat_ptr;
429 extern bfd_boolean delete_output_file_on_failure;
431 extern struct bfd_sym_chain entry_symbol;
432 extern const char *entry_section;
433 extern bfd_boolean entry_from_cmdline;
434 extern lang_statement_list_type file_chain;
436 extern int lang_statement_iteration;
438 extern void lang_init
440 extern lang_memory_region_type *lang_memory_region_lookup
441 (const char *const, bfd_boolean);
442 extern lang_memory_region_type *lang_memory_region_default
446 extern void lang_set_flags
447 (lang_memory_region_type *, const char *, int);
448 extern void lang_add_output
449 (const char *, int from_script);
450 extern lang_output_section_statement_type *lang_enter_output_section_statement
451 (const char *output_section_statement_name,
452 etree_type *address_exp,
453 enum section_type sectype,
455 etree_type *subalign,
457 extern void lang_final
459 extern void lang_process
461 extern void lang_section_start
462 (const char *, union etree_union *, const segment_type *);
463 extern void lang_add_entry
464 (const char *, bfd_boolean);
465 extern void lang_add_target
467 extern void lang_add_wild
468 (struct wildcard_spec *, struct wildcard_list *, bfd_boolean);
469 extern void lang_add_map
471 extern void lang_add_fill
473 extern lang_assignment_statement_type *lang_add_assignment
474 (union etree_union *);
475 extern void lang_add_attribute
476 (enum statement_enum);
477 extern void lang_startup
479 extern void lang_float
481 extern void lang_leave_output_section_statement
482 (fill_type *, const char *, lang_output_section_phdr_list *,
484 extern void lang_abs_symbol_at_end_of
485 (const char *, const char *);
486 extern void lang_abs_symbol_at_beginning_of
487 (const char *, const char *);
488 extern void lang_statement_append
489 (lang_statement_list_type *, lang_statement_union_type *,
490 lang_statement_union_type **);
491 extern void lang_for_each_input_file
492 (void (*dothis) (lang_input_statement_type *));
493 extern void lang_for_each_file
494 (void (*dothis) (lang_input_statement_type *));
495 extern void lang_reset_memory_regions
497 extern void lang_do_assignments
498 (lang_statement_union_type *, lang_output_section_statement_type *,
499 fill_type *, bfd_vma);
501 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \
502 lang_input_statement_type *statement; \
503 for (statement = (lang_input_statement_type *) file_chain.head; \
504 statement != (lang_input_statement_type *) NULL; \
505 statement = (lang_input_statement_type *) statement->next) \
507 extern void lang_process
509 extern void ldlang_add_file
510 (lang_input_statement_type *);
511 extern lang_output_section_statement_type *lang_output_section_find
512 (const char * const);
513 extern lang_output_section_statement_type *lang_output_section_find_by_flags
514 (const asection *, lang_output_section_statement_type **exact);
515 extern lang_output_section_statement_type *lang_insert_orphan
516 (lang_input_statement_type *, asection *, const char *,
517 lang_output_section_statement_type *, struct orphan_save *,
518 etree_type *, lang_statement_list_type *);
519 extern lang_input_statement_type *lang_add_input_file
520 (const char *, lang_input_file_enum_type, const char *);
521 extern void lang_add_keepsyms_file
523 extern lang_output_section_statement_type *
524 lang_output_section_statement_lookup
526 extern void ldlang_add_undef
528 extern void lang_add_output_format
529 (const char *, const char *, const char *, int);
530 extern void lang_list_init
531 (lang_statement_list_type *);
532 extern void lang_add_data
533 (int type, union etree_union *);
534 extern void lang_add_reloc
535 (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *,
536 union etree_union *);
537 extern void lang_for_each_statement
538 (void (*) (lang_statement_union_type *));
539 extern void *stat_alloc
541 extern void dprint_statement
542 (lang_statement_union_type *, int);
543 extern bfd_vma lang_size_sections
544 (lang_statement_union_type *, lang_output_section_statement_type *,
545 lang_statement_union_type **, fill_type *, bfd_vma, bfd_boolean *,
547 extern void lang_enter_group
549 extern void lang_leave_group
551 extern void lang_add_section
552 (lang_statement_list_type *, asection *,
553 lang_output_section_statement_type *, lang_input_statement_type *);
554 extern void lang_new_phdr
555 (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *,
557 extern void lang_add_nocrossref
558 (lang_nocrossref_type *);
559 extern void lang_enter_overlay
560 (etree_type *, etree_type *);
561 extern void lang_enter_overlay_section
563 extern void lang_leave_overlay_section
564 (fill_type *, lang_output_section_phdr_list *);
565 extern void lang_leave_overlay
566 (etree_type *, int, fill_type *, const char *,
567 lang_output_section_phdr_list *, const char *);
569 extern struct bfd_elf_version_tree *lang_elf_version_info;
571 extern struct bfd_elf_version_expr *lang_new_vers_pattern
572 (struct bfd_elf_version_expr *, const char *, const char *);
573 extern struct bfd_elf_version_tree *lang_new_vers_node
574 (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *);
575 extern struct bfd_elf_version_deps *lang_add_vers_depend
576 (struct bfd_elf_version_deps *, const char *);
577 extern void lang_register_vers_node
578 (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *);
579 bfd_boolean unique_section_p
581 extern void lang_add_unique
583 extern const char *lang_get_output_target
585 extern void lang_track_definedness (const char *);
586 extern int lang_symbol_definition_iteration (const char *);
587 extern void lang_update_definedness
588 (const char *, struct bfd_link_hash_entry *);
590 extern void add_excluded_libs (const char *);