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 lang_wild_statement_type;
303 typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *,
304 asection *, lang_input_statement_type *, void *);
306 typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *,
307 lang_input_statement_type *,
311 struct lang_wild_statement_struct
313 lang_statement_header_type header;
314 const char *filename;
315 bfd_boolean filenames_sorted;
316 struct wildcard_list *section_list;
317 bfd_boolean keep_sections;
318 lang_statement_list_type children;
320 walk_wild_section_handler_t walk_wild_section_handler;
321 struct wildcard_list *handler_data[4];
324 typedef struct lang_address_statement_struct
326 lang_statement_header_type header;
327 const char *section_name;
328 union etree_union *address;
329 const segment_type *segment;
330 } lang_address_statement_type;
334 lang_statement_header_type header;
335 bfd_vma output_offset;
337 asection *output_section;
339 } lang_padding_statement_type;
341 /* A group statement collects a set of libraries together. The
342 libraries are searched multiple times, until no new undefined
343 symbols are found. The effect is to search a group of libraries as
344 though they were a single library. */
348 lang_statement_header_type header;
349 lang_statement_list_type children;
350 } lang_group_statement_type;
352 typedef union lang_statement_union
354 lang_statement_header_type header;
355 lang_wild_statement_type wild_statement;
356 lang_data_statement_type data_statement;
357 lang_reloc_statement_type reloc_statement;
358 lang_address_statement_type address_statement;
359 lang_output_section_statement_type output_section_statement;
360 lang_afile_asection_pair_statement_type afile_asection_pair_statement;
361 lang_assignment_statement_type assignment_statement;
362 lang_input_statement_type input_statement;
363 lang_target_statement_type target_statement;
364 lang_output_statement_type output_statement;
365 lang_input_section_type input_section;
366 lang_common_statement_type common_statement;
367 lang_object_symbols_statement_type object_symbols_statement;
368 lang_fill_statement_type fill_statement;
369 lang_padding_statement_type padding_statement;
370 lang_group_statement_type group_statement;
371 } lang_statement_union_type;
373 /* This structure holds information about a program header, from the
374 PHDRS command in the linker script. */
378 struct lang_phdr *next;
387 /* This structure is used to hold a list of sections which may not
388 cross reference each other. */
390 typedef struct lang_nocrossref
392 struct lang_nocrossref *next;
394 } lang_nocrossref_type;
396 /* The list of nocrossref lists. */
398 struct lang_nocrossrefs
400 struct lang_nocrossrefs *next;
401 lang_nocrossref_type *list;
404 extern struct lang_nocrossrefs *nocrossref_list;
406 /* This structure is used to hold a list of input section names which
407 will not match an output section in the linker script. */
409 struct unique_sections
411 struct unique_sections *next;
415 /* This structure records symbols for which we need to keep track of
416 definedness for use in the DEFINED () test. */
418 struct lang_definedness_hash_entry
420 struct bfd_hash_entry root;
424 /* Used by place_orphan to keep track of orphan sections and statements. */
429 lang_output_section_statement_type *os;
431 lang_statement_union_type **stmt;
432 lang_output_section_statement_type **os_tail;
435 extern lang_output_section_statement_type *abs_output_section;
436 extern lang_statement_list_type lang_output_section_statement;
437 extern bfd_boolean lang_has_input_file;
438 extern etree_type *base;
439 extern lang_statement_list_type *stat_ptr;
440 extern bfd_boolean delete_output_file_on_failure;
442 extern struct bfd_sym_chain entry_symbol;
443 extern const char *entry_section;
444 extern bfd_boolean entry_from_cmdline;
445 extern lang_statement_list_type file_chain;
447 extern int lang_statement_iteration;
449 extern void lang_init
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_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
509 (lang_statement_union_type *, lang_output_section_statement_type *,
510 fill_type *, bfd_vma);
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 bfd_vma lang_size_sections
557 (lang_statement_union_type *, lang_output_section_statement_type *,
558 lang_statement_union_type **, fill_type *, bfd_vma, 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 *);
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 *);