| 1 | /* ldlang.h - linker command language support |
| 2 | Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
| 3 | 2001, 2002, 2003, 2004 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GLD, the Gnu Linker. |
| 7 | |
| 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) |
| 11 | any later version. |
| 12 | |
| 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. |
| 17 | |
| 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 |
| 21 | 02111-1307, USA. */ |
| 22 | |
| 23 | #ifndef LDLANG_H |
| 24 | #define LDLANG_H |
| 25 | |
| 26 | #define DEFAULT_MEMORY_REGION "*default*" |
| 27 | |
| 28 | typedef enum |
| 29 | { |
| 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; |
| 37 | |
| 38 | struct _fill_type |
| 39 | { |
| 40 | size_t size; |
| 41 | unsigned char data[1]; |
| 42 | }; |
| 43 | |
| 44 | typedef struct statement_list |
| 45 | { |
| 46 | union lang_statement_union *head; |
| 47 | union lang_statement_union **tail; |
| 48 | } lang_statement_list_type; |
| 49 | |
| 50 | typedef struct memory_region_struct |
| 51 | { |
| 52 | char *name; |
| 53 | struct memory_region_struct *next; |
| 54 | bfd_vma origin; |
| 55 | bfd_size_type length; |
| 56 | bfd_vma current; |
| 57 | bfd_size_type old_length; |
| 58 | flagword flags; |
| 59 | flagword not_flags; |
| 60 | bfd_boolean had_full_message; |
| 61 | } lang_memory_region_type; |
| 62 | |
| 63 | typedef struct lang_statement_header_struct |
| 64 | { |
| 65 | union lang_statement_union *next; |
| 66 | enum statement_enum |
| 67 | { |
| 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, |
| 82 | |
| 83 | lang_afile_asection_pair_statement_enum, |
| 84 | lang_constructors_statement_enum |
| 85 | } type; |
| 86 | } lang_statement_header_type; |
| 87 | |
| 88 | typedef struct |
| 89 | { |
| 90 | lang_statement_header_type header; |
| 91 | union etree_union *exp; |
| 92 | } lang_assignment_statement_type; |
| 93 | |
| 94 | typedef struct lang_target_statement_struct |
| 95 | { |
| 96 | lang_statement_header_type header; |
| 97 | const char *target; |
| 98 | } lang_target_statement_type; |
| 99 | |
| 100 | typedef struct lang_output_statement_struct |
| 101 | { |
| 102 | lang_statement_header_type header; |
| 103 | const char *name; |
| 104 | } lang_output_statement_type; |
| 105 | |
| 106 | /* Section types specified in a linker script. */ |
| 107 | |
| 108 | enum section_type |
| 109 | { |
| 110 | normal_section, |
| 111 | dsect_section, |
| 112 | copy_section, |
| 113 | noload_section, |
| 114 | info_section, |
| 115 | overlay_section |
| 116 | }; |
| 117 | |
| 118 | /* This structure holds a list of program headers describing |
| 119 | segments in which this section should be placed. */ |
| 120 | |
| 121 | typedef struct lang_output_section_phdr_list |
| 122 | { |
| 123 | struct lang_output_section_phdr_list *next; |
| 124 | const char *name; |
| 125 | bfd_boolean used; |
| 126 | } lang_output_section_phdr_list; |
| 127 | |
| 128 | typedef struct lang_output_section_statement_struct |
| 129 | { |
| 130 | lang_statement_header_type header; |
| 131 | union etree_union *addr_tree; |
| 132 | lang_statement_list_type children; |
| 133 | const char *memspec; |
| 134 | union lang_statement_union *next; |
| 135 | const char *name; |
| 136 | |
| 137 | int processed; |
| 138 | |
| 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; |
| 144 | size_t block_value; |
| 145 | fill_type *fill; |
| 146 | |
| 147 | int subsection_alignment; /* Alignment of components. */ |
| 148 | int section_alignment; /* Alignment of start of section. */ |
| 149 | int constraint; |
| 150 | bfd_boolean all_input_readonly; |
| 151 | |
| 152 | union etree_union *load_base; |
| 153 | |
| 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; |
| 159 | |
| 160 | lang_output_section_phdr_list *phdrs; |
| 161 | } lang_output_section_statement_type; |
| 162 | |
| 163 | typedef struct |
| 164 | { |
| 165 | lang_statement_header_type header; |
| 166 | } lang_common_statement_type; |
| 167 | |
| 168 | typedef struct |
| 169 | { |
| 170 | lang_statement_header_type header; |
| 171 | } lang_object_symbols_statement_type; |
| 172 | |
| 173 | typedef struct |
| 174 | { |
| 175 | lang_statement_header_type header; |
| 176 | fill_type *fill; |
| 177 | int size; |
| 178 | asection *output_section; |
| 179 | } lang_fill_statement_type; |
| 180 | |
| 181 | typedef struct |
| 182 | { |
| 183 | lang_statement_header_type header; |
| 184 | unsigned int type; |
| 185 | union etree_union *exp; |
| 186 | bfd_vma value; |
| 187 | asection *output_section; |
| 188 | bfd_vma output_vma; |
| 189 | } lang_data_statement_type; |
| 190 | |
| 191 | /* Generate a reloc in the output file. */ |
| 192 | |
| 193 | typedef struct |
| 194 | { |
| 195 | lang_statement_header_type header; |
| 196 | |
| 197 | /* Reloc to generate. */ |
| 198 | bfd_reloc_code_real_type reloc; |
| 199 | |
| 200 | /* Reloc howto structure. */ |
| 201 | reloc_howto_type *howto; |
| 202 | |
| 203 | /* Section to generate reloc against. |
| 204 | Exactly one of section and name must be NULL. */ |
| 205 | asection *section; |
| 206 | |
| 207 | /* Name of symbol to generate reloc against. |
| 208 | Exactly one of section and name must be NULL. */ |
| 209 | const char *name; |
| 210 | |
| 211 | /* Expression for addend. */ |
| 212 | union etree_union *addend_exp; |
| 213 | |
| 214 | /* Resolved addend. */ |
| 215 | bfd_vma addend_value; |
| 216 | |
| 217 | /* Output section where reloc should be performed. */ |
| 218 | asection *output_section; |
| 219 | |
| 220 | /* VMA within output section. */ |
| 221 | bfd_vma output_vma; |
| 222 | } lang_reloc_statement_type; |
| 223 | |
| 224 | typedef struct lang_input_statement_struct |
| 225 | { |
| 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; |
| 233 | |
| 234 | bfd *the_bfd; |
| 235 | |
| 236 | bfd_boolean closed; |
| 237 | file_ptr passive_position; |
| 238 | |
| 239 | /* Symbol table of the file. */ |
| 240 | asymbol **asymbols; |
| 241 | unsigned int symbol_count; |
| 242 | |
| 243 | /* Point to the next file - whatever it is, wanders up and down |
| 244 | archives */ |
| 245 | union lang_statement_union *next; |
| 246 | |
| 247 | /* Point to the next file, but skips archive contents. */ |
| 248 | union lang_statement_union *next_real_file; |
| 249 | |
| 250 | bfd_boolean is_archive; |
| 251 | |
| 252 | /* 1 means search a set of directories for this file. */ |
| 253 | bfd_boolean search_dirs_flag; |
| 254 | |
| 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; |
| 260 | |
| 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; |
| 265 | |
| 266 | /* Whether to search for this entry as a dynamic archive. */ |
| 267 | bfd_boolean dynamic; |
| 268 | |
| 269 | /* Whether this entry should cause a DT_NEEDED tag only when |
| 270 | satisfying references from regular files, or always. */ |
| 271 | bfd_boolean as_needed; |
| 272 | |
| 273 | /* Whether to include the entire contents of an archive. */ |
| 274 | bfd_boolean whole_archive; |
| 275 | |
| 276 | bfd_boolean loaded; |
| 277 | |
| 278 | #if 0 |
| 279 | unsigned int globals_in_this_file; |
| 280 | #endif |
| 281 | const char *target; |
| 282 | bfd_boolean real; |
| 283 | } lang_input_statement_type; |
| 284 | |
| 285 | typedef struct |
| 286 | { |
| 287 | lang_statement_header_type header; |
| 288 | asection *section; |
| 289 | lang_input_statement_type *ifile; |
| 290 | |
| 291 | } lang_input_section_type; |
| 292 | |
| 293 | typedef struct |
| 294 | { |
| 295 | lang_statement_header_type header; |
| 296 | asection *section; |
| 297 | union lang_statement_union *file; |
| 298 | } lang_afile_asection_pair_statement_type; |
| 299 | |
| 300 | typedef struct lang_wild_statement_struct |
| 301 | { |
| 302 | lang_statement_header_type header; |
| 303 | const char *filename; |
| 304 | bfd_boolean filenames_sorted; |
| 305 | struct wildcard_list *section_list; |
| 306 | bfd_boolean keep_sections; |
| 307 | lang_statement_list_type children; |
| 308 | } lang_wild_statement_type; |
| 309 | |
| 310 | typedef struct lang_address_statement_struct |
| 311 | { |
| 312 | lang_statement_header_type header; |
| 313 | const char *section_name; |
| 314 | union etree_union *address; |
| 315 | } lang_address_statement_type; |
| 316 | |
| 317 | typedef struct |
| 318 | { |
| 319 | lang_statement_header_type header; |
| 320 | bfd_vma output_offset; |
| 321 | size_t size; |
| 322 | asection *output_section; |
| 323 | fill_type *fill; |
| 324 | } lang_padding_statement_type; |
| 325 | |
| 326 | /* A group statement collects a set of libraries together. The |
| 327 | libraries are searched multiple times, until no new undefined |
| 328 | symbols are found. The effect is to search a group of libraries as |
| 329 | though they were a single library. */ |
| 330 | |
| 331 | typedef struct |
| 332 | { |
| 333 | lang_statement_header_type header; |
| 334 | lang_statement_list_type children; |
| 335 | } lang_group_statement_type; |
| 336 | |
| 337 | typedef union lang_statement_union |
| 338 | { |
| 339 | lang_statement_header_type header; |
| 340 | lang_wild_statement_type wild_statement; |
| 341 | lang_data_statement_type data_statement; |
| 342 | lang_reloc_statement_type reloc_statement; |
| 343 | lang_address_statement_type address_statement; |
| 344 | lang_output_section_statement_type output_section_statement; |
| 345 | lang_afile_asection_pair_statement_type afile_asection_pair_statement; |
| 346 | lang_assignment_statement_type assignment_statement; |
| 347 | lang_input_statement_type input_statement; |
| 348 | lang_target_statement_type target_statement; |
| 349 | lang_output_statement_type output_statement; |
| 350 | lang_input_section_type input_section; |
| 351 | lang_common_statement_type common_statement; |
| 352 | lang_object_symbols_statement_type object_symbols_statement; |
| 353 | lang_fill_statement_type fill_statement; |
| 354 | lang_padding_statement_type padding_statement; |
| 355 | lang_group_statement_type group_statement; |
| 356 | } lang_statement_union_type; |
| 357 | |
| 358 | /* This structure holds information about a program header, from the |
| 359 | PHDRS command in the linker script. */ |
| 360 | |
| 361 | struct lang_phdr |
| 362 | { |
| 363 | struct lang_phdr *next; |
| 364 | const char *name; |
| 365 | unsigned long type; |
| 366 | bfd_boolean filehdr; |
| 367 | bfd_boolean phdrs; |
| 368 | etree_type *at; |
| 369 | etree_type *flags; |
| 370 | }; |
| 371 | |
| 372 | /* This structure is used to hold a list of sections which may not |
| 373 | cross reference each other. */ |
| 374 | |
| 375 | typedef struct lang_nocrossref |
| 376 | { |
| 377 | struct lang_nocrossref *next; |
| 378 | const char *name; |
| 379 | } lang_nocrossref_type; |
| 380 | |
| 381 | /* The list of nocrossref lists. */ |
| 382 | |
| 383 | struct lang_nocrossrefs |
| 384 | { |
| 385 | struct lang_nocrossrefs *next; |
| 386 | lang_nocrossref_type *list; |
| 387 | }; |
| 388 | |
| 389 | extern struct lang_nocrossrefs *nocrossref_list; |
| 390 | |
| 391 | /* This structure is used to hold a list of input section names which |
| 392 | will not match an output section in the linker script. */ |
| 393 | |
| 394 | struct unique_sections |
| 395 | { |
| 396 | struct unique_sections *next; |
| 397 | const char *name; |
| 398 | }; |
| 399 | |
| 400 | /* This structure records symbols for which we need to keep track of |
| 401 | definedness for use in the DEFINED () test. */ |
| 402 | |
| 403 | struct lang_definedness_hash_entry |
| 404 | { |
| 405 | struct bfd_hash_entry root; |
| 406 | int iteration; |
| 407 | }; |
| 408 | |
| 409 | extern struct unique_sections *unique_section_list; |
| 410 | |
| 411 | extern lang_output_section_statement_type *abs_output_section; |
| 412 | extern lang_statement_list_type lang_output_section_statement; |
| 413 | extern bfd_boolean lang_has_input_file; |
| 414 | extern etree_type *base; |
| 415 | extern lang_statement_list_type *stat_ptr; |
| 416 | extern bfd_boolean delete_output_file_on_failure; |
| 417 | |
| 418 | extern struct bfd_sym_chain entry_symbol; |
| 419 | extern const char *entry_section; |
| 420 | extern bfd_boolean entry_from_cmdline; |
| 421 | extern lang_statement_list_type file_chain; |
| 422 | |
| 423 | extern int lang_statement_iteration; |
| 424 | |
| 425 | extern void lang_init |
| 426 | (void); |
| 427 | extern lang_memory_region_type *lang_memory_region_lookup |
| 428 | (const char *const, bfd_boolean); |
| 429 | extern lang_memory_region_type *lang_memory_region_default |
| 430 | (asection *); |
| 431 | extern void lang_map |
| 432 | (void); |
| 433 | extern void lang_set_flags |
| 434 | (lang_memory_region_type *, const char *, int); |
| 435 | extern void lang_add_output |
| 436 | (const char *, int from_script); |
| 437 | extern lang_output_section_statement_type *lang_enter_output_section_statement |
| 438 | (const char *output_section_statement_name, |
| 439 | etree_type *address_exp, |
| 440 | enum section_type sectype, |
| 441 | etree_type *align, |
| 442 | etree_type *subalign, |
| 443 | etree_type *, int); |
| 444 | extern void lang_final |
| 445 | (void); |
| 446 | extern void lang_process |
| 447 | (void); |
| 448 | extern void lang_section_start |
| 449 | (const char *, union etree_union *); |
| 450 | extern void lang_add_entry |
| 451 | (const char *, bfd_boolean); |
| 452 | extern void lang_add_target |
| 453 | (const char *); |
| 454 | extern void lang_add_wild |
| 455 | (struct wildcard_spec *, struct wildcard_list *, bfd_boolean); |
| 456 | extern void lang_add_map |
| 457 | (const char *); |
| 458 | extern void lang_add_fill |
| 459 | (fill_type *); |
| 460 | extern lang_assignment_statement_type *lang_add_assignment |
| 461 | (union etree_union *); |
| 462 | extern void lang_add_attribute |
| 463 | (enum statement_enum); |
| 464 | extern void lang_startup |
| 465 | (const char *); |
| 466 | extern void lang_float |
| 467 | (bfd_boolean); |
| 468 | extern void lang_leave_output_section_statement |
| 469 | (fill_type *, const char *, lang_output_section_phdr_list *, |
| 470 | const char *); |
| 471 | extern void lang_abs_symbol_at_end_of |
| 472 | (const char *, const char *); |
| 473 | extern void lang_abs_symbol_at_beginning_of |
| 474 | (const char *, const char *); |
| 475 | extern void lang_statement_append |
| 476 | (lang_statement_list_type *, lang_statement_union_type *, |
| 477 | lang_statement_union_type **); |
| 478 | extern void lang_for_each_input_file |
| 479 | (void (*dothis) (lang_input_statement_type *)); |
| 480 | extern void lang_for_each_file |
| 481 | (void (*dothis) (lang_input_statement_type *)); |
| 482 | extern void lang_reset_memory_regions |
| 483 | (void); |
| 484 | extern void lang_do_assignments |
| 485 | (lang_statement_union_type *, lang_output_section_statement_type *, |
| 486 | fill_type *, bfd_vma); |
| 487 | |
| 488 | #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \ |
| 489 | lang_input_statement_type *statement; \ |
| 490 | for (statement = (lang_input_statement_type *) file_chain.head; \ |
| 491 | statement != (lang_input_statement_type *) NULL; \ |
| 492 | statement = (lang_input_statement_type *) statement->next) \ |
| 493 | |
| 494 | extern void lang_process |
| 495 | (void); |
| 496 | extern void ldlang_add_file |
| 497 | (lang_input_statement_type *); |
| 498 | extern lang_output_section_statement_type *lang_output_section_find |
| 499 | (const char * const); |
| 500 | extern lang_input_statement_type *lang_add_input_file |
| 501 | (const char *, lang_input_file_enum_type, const char *); |
| 502 | extern void lang_add_keepsyms_file |
| 503 | (const char *); |
| 504 | extern lang_output_section_statement_type * |
| 505 | lang_output_section_statement_lookup |
| 506 | (const char *const); |
| 507 | extern void ldlang_add_undef |
| 508 | (const char *const); |
| 509 | extern void lang_add_output_format |
| 510 | (const char *, const char *, const char *, int); |
| 511 | extern void lang_list_init |
| 512 | (lang_statement_list_type *); |
| 513 | extern void lang_add_data |
| 514 | (int type, union etree_union *); |
| 515 | extern void lang_add_reloc |
| 516 | (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *, |
| 517 | union etree_union *); |
| 518 | extern void lang_for_each_statement |
| 519 | (void (*) (lang_statement_union_type *)); |
| 520 | extern void *stat_alloc |
| 521 | (size_t); |
| 522 | extern void dprint_statement |
| 523 | (lang_statement_union_type *, int); |
| 524 | extern bfd_vma lang_size_sections |
| 525 | (lang_statement_union_type *, lang_output_section_statement_type *, |
| 526 | lang_statement_union_type **, fill_type *, bfd_vma, bfd_boolean *, |
| 527 | bfd_boolean); |
| 528 | extern void lang_enter_group |
| 529 | (void); |
| 530 | extern void lang_leave_group |
| 531 | (void); |
| 532 | extern void lang_add_section |
| 533 | (lang_statement_list_type *, asection *, |
| 534 | lang_output_section_statement_type *, lang_input_statement_type *); |
| 535 | extern void lang_new_phdr |
| 536 | (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *, |
| 537 | etree_type *); |
| 538 | extern void lang_add_nocrossref |
| 539 | (lang_nocrossref_type *); |
| 540 | extern void lang_enter_overlay |
| 541 | (etree_type *, etree_type *); |
| 542 | extern void lang_enter_overlay_section |
| 543 | (const char *); |
| 544 | extern void lang_leave_overlay_section |
| 545 | (fill_type *, lang_output_section_phdr_list *); |
| 546 | extern void lang_leave_overlay |
| 547 | (etree_type *, int, fill_type *, const char *, |
| 548 | lang_output_section_phdr_list *, const char *); |
| 549 | |
| 550 | extern struct bfd_elf_version_tree *lang_elf_version_info; |
| 551 | |
| 552 | extern struct bfd_elf_version_expr *lang_new_vers_pattern |
| 553 | (struct bfd_elf_version_expr *, const char *, const char *); |
| 554 | extern struct bfd_elf_version_tree *lang_new_vers_node |
| 555 | (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *); |
| 556 | extern struct bfd_elf_version_deps *lang_add_vers_depend |
| 557 | (struct bfd_elf_version_deps *, const char *); |
| 558 | extern void lang_register_vers_node |
| 559 | (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *); |
| 560 | bfd_boolean unique_section_p |
| 561 | (const asection *); |
| 562 | extern void lang_add_unique |
| 563 | (const char *); |
| 564 | extern const char *lang_get_output_target |
| 565 | (void); |
| 566 | extern void lang_track_definedness (const char *); |
| 567 | extern int lang_symbol_definition_iteration (const char *); |
| 568 | extern void lang_update_definedness |
| 569 | (const char *, struct bfd_link_hash_entry *); |
| 570 | |
| 571 | #endif |