1 /* ldlang.h - linker command language support
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
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 union lang_statement_union *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 union etree_union *load_base;
152 /* If non-null, an expression to evaluate after setting the section's
153 size. The expression is evaluated inside REGION (above) with '.'
154 set to the end of the section. Used in the last overlay section
155 to move '.' past all the overlaid sections. */
156 union etree_union *update_dot_tree;
158 lang_output_section_phdr_list *phdrs;
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;
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 /* VMA within output section. */
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 to include the entire contents of an archive. */
268 bfd_boolean whole_archive;
273 unsigned int globals_in_this_file;
277 } lang_input_statement_type;
281 lang_statement_header_type header;
283 lang_input_statement_type *ifile;
285 } lang_input_section_type;
289 lang_statement_header_type header;
291 union lang_statement_union *file;
292 } lang_afile_asection_pair_statement_type;
294 typedef struct lang_wild_statement_struct
296 lang_statement_header_type header;
297 const char *filename;
298 bfd_boolean filenames_sorted;
299 struct wildcard_list *section_list;
300 bfd_boolean keep_sections;
301 lang_statement_list_type children;
302 } lang_wild_statement_type;
304 typedef struct lang_address_statement_struct
306 lang_statement_header_type header;
307 const char *section_name;
308 union etree_union *address;
309 } lang_address_statement_type;
313 lang_statement_header_type header;
314 bfd_vma output_offset;
316 asection *output_section;
318 } lang_padding_statement_type;
320 /* A group statement collects a set of libraries together. The
321 libraries are searched multiple times, until no new undefined
322 symbols are found. The effect is to search a group of libraries as
323 though they were a single library. */
327 lang_statement_header_type header;
328 lang_statement_list_type children;
329 } lang_group_statement_type;
331 typedef union lang_statement_union
333 lang_statement_header_type header;
334 lang_wild_statement_type wild_statement;
335 lang_data_statement_type data_statement;
336 lang_reloc_statement_type reloc_statement;
337 lang_address_statement_type address_statement;
338 lang_output_section_statement_type output_section_statement;
339 lang_afile_asection_pair_statement_type afile_asection_pair_statement;
340 lang_assignment_statement_type assignment_statement;
341 lang_input_statement_type input_statement;
342 lang_target_statement_type target_statement;
343 lang_output_statement_type output_statement;
344 lang_input_section_type input_section;
345 lang_common_statement_type common_statement;
346 lang_object_symbols_statement_type object_symbols_statement;
347 lang_fill_statement_type fill_statement;
348 lang_padding_statement_type padding_statement;
349 lang_group_statement_type group_statement;
350 } lang_statement_union_type;
352 /* This structure holds information about a program header, from the
353 PHDRS command in the linker script. */
357 struct lang_phdr *next;
366 /* This structure is used to hold a list of sections which may not
367 cross reference each other. */
369 typedef struct lang_nocrossref
371 struct lang_nocrossref *next;
373 } lang_nocrossref_type;
375 /* The list of nocrossref lists. */
377 struct lang_nocrossrefs
379 struct lang_nocrossrefs *next;
380 lang_nocrossref_type *list;
383 extern struct lang_nocrossrefs *nocrossref_list;
385 /* This structure is used to hold a list of input section names which
386 will not match an output section in the linker script. */
388 struct unique_sections
390 struct unique_sections *next;
394 /* This structure records symbols for which we need to keep track of
395 definedness for use in the DEFINED () test. */
397 struct lang_definedness_hash_entry
399 struct bfd_hash_entry root;
403 extern struct unique_sections *unique_section_list;
405 extern lang_output_section_statement_type *abs_output_section;
406 extern lang_statement_list_type lang_output_section_statement;
407 extern bfd_boolean lang_has_input_file;
408 extern etree_type *base;
409 extern lang_statement_list_type *stat_ptr;
410 extern bfd_boolean delete_output_file_on_failure;
412 extern struct bfd_sym_chain entry_symbol;
413 extern const char *entry_section;
414 extern bfd_boolean entry_from_cmdline;
415 extern lang_statement_list_type file_chain;
417 extern int lang_statement_iteration;
419 extern void lang_init
421 extern lang_memory_region_type *lang_memory_region_lookup
422 (const char *const, bfd_boolean);
423 extern lang_memory_region_type *lang_memory_region_default
427 extern void lang_set_flags
428 (lang_memory_region_type *, const char *, int);
429 extern void lang_add_output
430 (const char *, int from_script);
431 extern lang_output_section_statement_type *lang_enter_output_section_statement
432 (const char *output_section_statement_name,
433 etree_type *address_exp,
434 enum section_type sectype,
436 etree_type *subalign,
438 extern void lang_final
440 extern void lang_process
442 extern void lang_section_start
443 (const char *, union etree_union *);
444 extern void lang_add_entry
445 (const char *, bfd_boolean);
446 extern void lang_add_target
448 extern void lang_add_wild
449 (struct wildcard_spec *, struct wildcard_list *, bfd_boolean);
450 extern void lang_add_map
452 extern void lang_add_fill
454 extern lang_assignment_statement_type *lang_add_assignment
455 (union etree_union *);
456 extern void lang_add_attribute
457 (enum statement_enum);
458 extern void lang_startup
460 extern void lang_float
462 extern void lang_leave_output_section_statement
463 (fill_type *, const char *, lang_output_section_phdr_list *,
465 extern void lang_abs_symbol_at_end_of
466 (const char *, const char *);
467 extern void lang_abs_symbol_at_beginning_of
468 (const char *, const char *);
469 extern void lang_statement_append
470 (lang_statement_list_type *, lang_statement_union_type *,
471 lang_statement_union_type **);
472 extern void lang_for_each_input_file
473 (void (*dothis) (lang_input_statement_type *));
474 extern void lang_for_each_file
475 (void (*dothis) (lang_input_statement_type *));
476 extern void lang_reset_memory_regions
478 extern void lang_do_assignments
479 (lang_statement_union_type *, lang_output_section_statement_type *,
480 fill_type *, bfd_vma);
482 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \
483 lang_input_statement_type *statement; \
484 for (statement = (lang_input_statement_type *) file_chain.head; \
485 statement != (lang_input_statement_type *) NULL; \
486 statement = (lang_input_statement_type *) statement->next) \
488 extern void lang_process
490 extern void ldlang_add_file
491 (lang_input_statement_type *);
492 extern lang_output_section_statement_type *lang_output_section_find
493 (const char * const);
494 extern lang_input_statement_type *lang_add_input_file
495 (const char *, lang_input_file_enum_type, const char *);
496 extern void lang_add_keepsyms_file
498 extern lang_output_section_statement_type *
499 lang_output_section_statement_lookup
501 extern void ldlang_add_undef
503 extern void lang_add_output_format
504 (const char *, const char *, const char *, int);
505 extern void lang_list_init
506 (lang_statement_list_type *);
507 extern void lang_add_data
508 (int type, union etree_union *);
509 extern void lang_add_reloc
510 (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *,
511 union etree_union *);
512 extern void lang_for_each_statement
513 (void (*) (lang_statement_union_type *));
514 extern void *stat_alloc
516 extern void dprint_statement
517 (lang_statement_union_type *, int);
518 extern bfd_vma lang_size_sections
519 (lang_statement_union_type *, lang_output_section_statement_type *,
520 lang_statement_union_type **, fill_type *, bfd_vma, bfd_boolean *,
522 extern void lang_enter_group
524 extern void lang_leave_group
526 extern void lang_add_section
527 (lang_statement_list_type *, asection *,
528 lang_output_section_statement_type *, lang_input_statement_type *);
529 extern void lang_new_phdr
530 (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *,
532 extern void lang_add_nocrossref
533 (lang_nocrossref_type *);
534 extern void lang_enter_overlay
535 (etree_type *, etree_type *);
536 extern void lang_enter_overlay_section
538 extern void lang_leave_overlay_section
539 (fill_type *, lang_output_section_phdr_list *);
540 extern void lang_leave_overlay
541 (etree_type *, int, fill_type *, const char *,
542 lang_output_section_phdr_list *, const char *);
544 extern struct bfd_elf_version_tree *lang_elf_version_info;
546 extern struct bfd_elf_version_expr *lang_new_vers_pattern
547 (struct bfd_elf_version_expr *, const char *, const char *);
548 extern struct bfd_elf_version_tree *lang_new_vers_node
549 (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *);
550 extern struct bfd_elf_version_deps *lang_add_vers_depend
551 (struct bfd_elf_version_deps *, const char *);
552 extern void lang_register_vers_node
553 (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *);
554 bfd_boolean unique_section_p
556 extern void lang_add_unique
558 extern const char *lang_get_output_target
560 extern void lang_track_definedness (const char *);
561 extern int lang_symbol_definition_iteration (const char *);
562 extern void lang_update_definedness
563 (const char *, struct bfd_link_hash_entry *);