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, 2006, 2007, 2008, 2009 4 Free Software Foundation, Inc. 5 6 This file is part of the GNU Binutils. 7 8 This program 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 3 of the License, or 11 (at your option) any later version. 12 13 This program 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 this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, 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 union lang_statement_union *last_os; 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 lang_insert_statement_enum, 83 lang_constructors_statement_enum 84 } type; 85 } lang_statement_header_type; 86 87 typedef struct 88 { 89 lang_statement_header_type header; 90 union etree_union *exp; 91 } lang_assignment_statement_type; 92 93 typedef struct lang_target_statement_struct 94 { 95 lang_statement_header_type header; 96 const char *target; 97 } lang_target_statement_type; 98 99 typedef struct lang_output_statement_struct 100 { 101 lang_statement_header_type header; 102 const char *name; 103 } lang_output_statement_type; 104 105 /* Section types specified in a linker script. */ 106 107 enum section_type 108 { 109 normal_section, 110 overlay_section, 111 noload_section, 112 noalloc_section 113 }; 114 115 /* This structure holds a list of program headers describing 116 segments in which this section should be placed. */ 117 118 typedef struct lang_output_section_phdr_list 119 { 120 struct lang_output_section_phdr_list *next; 121 const char *name; 122 bfd_boolean used; 123 } lang_output_section_phdr_list; 124 125 typedef struct lang_output_section_statement_struct 126 { 127 lang_statement_header_type header; 128 lang_statement_list_type children; 129 struct lang_output_section_statement_struct *next; 130 struct lang_output_section_statement_struct *prev; 131 const char *name; 132 asection *bfd_section; 133 lang_memory_region_type *region; 134 lang_memory_region_type *lma_region; 135 fill_type *fill; 136 union etree_union *addr_tree; 137 union etree_union *load_base; 138 139 /* If non-null, an expression to evaluate after setting the section's 140 size. The expression is evaluated inside REGION (above) with '.' 141 set to the end of the section. Used in the last overlay section 142 to move '.' past all the overlaid sections. */ 143 union etree_union *update_dot_tree; 144 145 lang_output_section_phdr_list *phdrs; 146 147 unsigned int block_value; 148 int subsection_alignment; /* Alignment of components. */ 149 int section_alignment; /* Alignment of start of section. */ 150 int constraint; 151 flagword flags; 152 enum section_type sectype; 153 unsigned int processed_vma : 1; 154 unsigned int processed_lma : 1; 155 unsigned int all_input_readonly : 1; 156 /* If this section should be ignored. */ 157 unsigned int ignored : 1; 158 /* If there is a symbol relative to this section. */ 159 unsigned int section_relative_symbol : 1; 160 } lang_output_section_statement_type; 161 162 typedef struct 163 { 164 lang_statement_header_type header; 165 } lang_common_statement_type; 166 167 typedef struct 168 { 169 lang_statement_header_type header; 170 } lang_object_symbols_statement_type; 171 172 typedef struct 173 { 174 lang_statement_header_type header; 175 fill_type *fill; 176 int size; 177 asection *output_section; 178 } lang_fill_statement_type; 179 180 typedef struct 181 { 182 lang_statement_header_type header; 183 unsigned int type; 184 union etree_union *exp; 185 bfd_vma value; 186 asection *output_section; 187 bfd_vma output_offset; 188 } lang_data_statement_type; 189 190 /* Generate a reloc in the output file. */ 191 192 typedef struct 193 { 194 lang_statement_header_type header; 195 196 /* Reloc to generate. */ 197 bfd_reloc_code_real_type reloc; 198 199 /* Reloc howto structure. */ 200 reloc_howto_type *howto; 201 202 /* Section to generate reloc against. 203 Exactly one of section and name must be NULL. */ 204 asection *section; 205 206 /* Name of symbol to generate reloc against. 207 Exactly one of section and name must be NULL. */ 208 const char *name; 209 210 /* Expression for addend. */ 211 union etree_union *addend_exp; 212 213 /* Resolved addend. */ 214 bfd_vma addend_value; 215 216 /* Output section where reloc should be performed. */ 217 asection *output_section; 218 219 /* Offset within output section. */ 220 bfd_vma output_offset; 221 } lang_reloc_statement_type; 222 223 typedef struct lang_input_statement_struct 224 { 225 lang_statement_header_type header; 226 /* Name of this file. */ 227 const char *filename; 228 /* Name to use for the symbol giving address of text start. 229 Usually the same as filename, but for a file spec'd with 230 -l this is the -l switch itself rather than the filename. */ 231 const char *local_sym_name; 232 233 bfd *the_bfd; 234 235 /* Point to the next file - whatever it is, wanders up and down 236 archives */ 237 union lang_statement_union *next; 238 239 /* Point to the next file, but skips archive contents. */ 240 union lang_statement_union *next_real_file; 241 242 const char *target; 243 244 unsigned int is_archive : 1; 245 246 /* 1 means search a set of directories for this file. */ 247 unsigned int search_dirs_flag : 1; 248 249 /* 1 means this was found in a search directory marked as sysrooted, 250 if search_dirs_flag is false, otherwise, that it should be 251 searched in ld_sysroot before any other location, as long as it 252 starts with a slash. */ 253 unsigned int sysrooted : 1; 254 255 /* 1 means this is base file of incremental load. 256 Do not load this file's text or data. 257 Also default text_start to after this file's bss. */ 258 unsigned int just_syms_flag : 1; 259 260 /* Whether to search for this entry as a dynamic archive. */ 261 unsigned int dynamic : 1; 262 263 /* Whether DT_NEEDED tags should be added for dynamic libraries in 264 DT_NEEDED tags from this entry. */ 265 unsigned int add_needed : 1; 266 267 /* Whether this entry should cause a DT_NEEDED tag only when 268 satisfying references from regular files, or always. */ 269 unsigned int as_needed : 1; 270 271 /* Whether to include the entire contents of an archive. */ 272 unsigned int whole_archive : 1; 273 274 unsigned int loaded : 1; 275 276 unsigned int real : 1; 277 } lang_input_statement_type; 278 279 typedef struct 280 { 281 lang_statement_header_type header; 282 asection *section; 283 } lang_input_section_type; 284 285 typedef struct lang_wild_statement_struct lang_wild_statement_type; 286 287 typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *, 288 asection *, lang_input_statement_type *, void *); 289 290 typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *, 291 lang_input_statement_type *, 292 callback_t callback, 293 void *data); 294 295 typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *, 296 bfd *, const asection *); 297 298 /* Binary search tree structure to efficiently sort sections by 299 name. */ 300 typedef struct lang_section_bst 301 { 302 asection *section; 303 struct lang_section_bst *left; 304 struct lang_section_bst *right; 305 } lang_section_bst_type; 306 307 struct lang_wild_statement_struct 308 { 309 lang_statement_header_type header; 310 const char *filename; 311 bfd_boolean filenames_sorted; 312 struct wildcard_list *section_list; 313 bfd_boolean keep_sections; 314 lang_statement_list_type children; 315 316 walk_wild_section_handler_t walk_wild_section_handler; 317 struct wildcard_list *handler_data[4]; 318 lang_section_bst_type *tree; 319 }; 320 321 typedef struct lang_address_statement_struct 322 { 323 lang_statement_header_type header; 324 const char *section_name; 325 union etree_union *address; 326 const segment_type *segment; 327 } lang_address_statement_type; 328 329 typedef struct 330 { 331 lang_statement_header_type header; 332 bfd_vma output_offset; 333 size_t size; 334 asection *output_section; 335 fill_type *fill; 336 } lang_padding_statement_type; 337 338 /* A group statement collects a set of libraries together. The 339 libraries are searched multiple times, until no new undefined 340 symbols are found. The effect is to search a group of libraries as 341 though they were a single library. */ 342 343 typedef struct 344 { 345 lang_statement_header_type header; 346 lang_statement_list_type children; 347 } lang_group_statement_type; 348 349 typedef struct 350 { 351 lang_statement_header_type header; 352 const char *where; 353 bfd_boolean is_before; 354 } lang_insert_statement_type; 355 356 typedef union lang_statement_union 357 { 358 lang_statement_header_type header; 359 lang_wild_statement_type wild_statement; 360 lang_data_statement_type data_statement; 361 lang_reloc_statement_type reloc_statement; 362 lang_address_statement_type address_statement; 363 lang_output_section_statement_type output_section_statement; 364 lang_assignment_statement_type assignment_statement; 365 lang_input_statement_type input_statement; 366 lang_target_statement_type target_statement; 367 lang_output_statement_type output_statement; 368 lang_input_section_type input_section; 369 lang_common_statement_type common_statement; 370 lang_object_symbols_statement_type object_symbols_statement; 371 lang_fill_statement_type fill_statement; 372 lang_padding_statement_type padding_statement; 373 lang_group_statement_type group_statement; 374 lang_insert_statement_type insert_statement; 375 } lang_statement_union_type; 376 377 /* This structure holds information about a program header, from the 378 PHDRS command in the linker script. */ 379 380 struct lang_phdr 381 { 382 struct lang_phdr *next; 383 const char *name; 384 unsigned long type; 385 bfd_boolean filehdr; 386 bfd_boolean phdrs; 387 etree_type *at; 388 etree_type *flags; 389 }; 390 391 extern struct lang_phdr *lang_phdr_list; 392 393 /* This structure is used to hold a list of sections which may not 394 cross reference each other. */ 395 396 typedef struct lang_nocrossref 397 { 398 struct lang_nocrossref *next; 399 const char *name; 400 } lang_nocrossref_type; 401 402 /* The list of nocrossref lists. */ 403 404 struct lang_nocrossrefs 405 { 406 struct lang_nocrossrefs *next; 407 lang_nocrossref_type *list; 408 }; 409 410 extern struct lang_nocrossrefs *nocrossref_list; 411 412 /* This structure is used to hold a list of input section names which 413 will not match an output section in the linker script. */ 414 415 struct unique_sections 416 { 417 struct unique_sections *next; 418 const char *name; 419 }; 420 421 /* This structure records symbols for which we need to keep track of 422 definedness for use in the DEFINED () test. */ 423 424 struct lang_definedness_hash_entry 425 { 426 struct bfd_hash_entry root; 427 int iteration; 428 }; 429 430 /* Used by place_orphan to keep track of orphan sections and statements. */ 431 432 struct orphan_save { 433 const char *name; 434 flagword flags; 435 lang_output_section_statement_type *os; 436 asection **section; 437 lang_statement_union_type **stmt; 438 lang_output_section_statement_type **os_tail; 439 }; 440 441 extern lang_output_section_statement_type *abs_output_section; 442 extern lang_statement_list_type lang_output_section_statement; 443 extern bfd_boolean lang_has_input_file; 444 extern etree_type *base; 445 extern lang_statement_list_type *stat_ptr; 446 extern bfd_boolean delete_output_file_on_failure; 447 448 extern struct bfd_sym_chain entry_symbol; 449 extern const char *entry_section; 450 extern bfd_boolean entry_from_cmdline; 451 extern lang_statement_list_type file_chain; 452 extern lang_statement_list_type input_file_chain; 453 454 extern int lang_statement_iteration; 455 456 extern void lang_init 457 (void); 458 extern void lang_finish 459 (void); 460 extern lang_memory_region_type *lang_memory_region_lookup 461 (const char *const, bfd_boolean); 462 extern lang_memory_region_type *lang_memory_region_default 463 (asection *); 464 extern void lang_map 465 (void); 466 extern void lang_set_flags 467 (lang_memory_region_type *, const char *, int); 468 extern void lang_add_output 469 (const char *, int from_script); 470 extern lang_output_section_statement_type *lang_enter_output_section_statement 471 (const char *output_section_statement_name, 472 etree_type *address_exp, 473 enum section_type sectype, 474 etree_type *align, 475 etree_type *subalign, 476 etree_type *, int); 477 extern void lang_final 478 (void); 479 extern void lang_process 480 (void); 481 extern void lang_section_start 482 (const char *, union etree_union *, const segment_type *); 483 extern void lang_add_entry 484 (const char *, bfd_boolean); 485 extern void lang_default_entry 486 (const char *); 487 extern void lang_add_target 488 (const char *); 489 extern void lang_add_wild 490 (struct wildcard_spec *, struct wildcard_list *, bfd_boolean); 491 extern void lang_add_map 492 (const char *); 493 extern void lang_add_fill 494 (fill_type *); 495 extern lang_assignment_statement_type *lang_add_assignment 496 (union etree_union *); 497 extern void lang_add_attribute 498 (enum statement_enum); 499 extern void lang_startup 500 (const char *); 501 extern void lang_float 502 (bfd_boolean); 503 extern void lang_leave_output_section_statement 504 (fill_type *, const char *, lang_output_section_phdr_list *, 505 const char *); 506 extern void lang_abs_symbol_at_end_of 507 (const char *, const char *); 508 extern void lang_abs_symbol_at_beginning_of 509 (const char *, const char *); 510 extern void lang_statement_append 511 (lang_statement_list_type *, lang_statement_union_type *, 512 lang_statement_union_type **); 513 extern void lang_for_each_input_file 514 (void (*dothis) (lang_input_statement_type *)); 515 extern void lang_for_each_file 516 (void (*dothis) (lang_input_statement_type *)); 517 extern void lang_reset_memory_regions 518 (void); 519 extern void lang_do_assignments 520 (void); 521 522 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \ 523 lang_input_statement_type *statement; \ 524 for (statement = (lang_input_statement_type *) file_chain.head; \ 525 statement != (lang_input_statement_type *) NULL; \ 526 statement = (lang_input_statement_type *) statement->next) \ 527 528 #define lang_output_section_find(NAME) \ 529 lang_output_section_statement_lookup (NAME, 0, FALSE) 530 531 extern void lang_process 532 (void); 533 extern void ldlang_add_file 534 (lang_input_statement_type *); 535 extern lang_output_section_statement_type *lang_output_section_find_by_flags 536 (const asection *, lang_output_section_statement_type **, 537 lang_match_sec_type_func); 538 extern lang_output_section_statement_type *lang_insert_orphan 539 (asection *, const char *, int, lang_output_section_statement_type *, 540 struct orphan_save *, etree_type *, lang_statement_list_type *); 541 extern lang_input_statement_type *lang_add_input_file 542 (const char *, lang_input_file_enum_type, const char *); 543 extern void lang_add_keepsyms_file 544 (const char *); 545 extern lang_output_section_statement_type *lang_output_section_statement_lookup 546 (const char *const, int, bfd_boolean); 547 extern void ldlang_add_undef 548 (const char *const); 549 extern void lang_add_output_format 550 (const char *, const char *, const char *, int); 551 extern void lang_list_init 552 (lang_statement_list_type *); 553 extern void push_stat_ptr 554 (lang_statement_list_type *); 555 extern void pop_stat_ptr 556 (void); 557 extern void lang_add_data 558 (int type, union etree_union *); 559 extern void lang_add_reloc 560 (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *, 561 union etree_union *); 562 extern void lang_for_each_statement 563 (void (*) (lang_statement_union_type *)); 564 extern void *stat_alloc 565 (size_t); 566 extern void strip_excluded_output_sections 567 (void); 568 extern void dprint_statement 569 (lang_statement_union_type *, int); 570 extern void lang_size_sections 571 (bfd_boolean *, bfd_boolean); 572 extern void one_lang_size_sections_pass 573 (bfd_boolean *, bfd_boolean); 574 extern void lang_add_insert 575 (const char *, int); 576 extern void lang_enter_group 577 (void); 578 extern void lang_leave_group 579 (void); 580 extern void lang_add_section 581 (lang_statement_list_type *, asection *, 582 lang_output_section_statement_type *); 583 extern void lang_new_phdr 584 (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *, 585 etree_type *); 586 extern void lang_add_nocrossref 587 (lang_nocrossref_type *); 588 extern void lang_enter_overlay 589 (etree_type *, etree_type *); 590 extern void lang_enter_overlay_section 591 (const char *); 592 extern void lang_leave_overlay_section 593 (fill_type *, lang_output_section_phdr_list *); 594 extern void lang_leave_overlay 595 (etree_type *, int, fill_type *, const char *, 596 lang_output_section_phdr_list *, const char *); 597 598 extern struct bfd_elf_version_tree *lang_elf_version_info; 599 600 extern struct bfd_elf_version_expr *lang_new_vers_pattern 601 (struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean); 602 extern struct bfd_elf_version_tree *lang_new_vers_node 603 (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *); 604 extern struct bfd_elf_version_deps *lang_add_vers_depend 605 (struct bfd_elf_version_deps *, const char *); 606 extern void lang_register_vers_node 607 (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *); 608 extern void lang_append_dynamic_list (struct bfd_elf_version_expr *); 609 extern void lang_append_dynamic_list_cpp_typeinfo (void); 610 extern void lang_append_dynamic_list_cpp_new (void); 611 extern void lang_add_unique 612 (const char *); 613 extern const char *lang_get_output_target 614 (void); 615 extern void lang_track_definedness (const char *); 616 extern int lang_symbol_definition_iteration (const char *); 617 extern void lang_update_definedness 618 (const char *, struct bfd_link_hash_entry *); 619 620 extern void add_excluded_libs (const char *); 621 extern bfd_boolean load_symbols 622 (lang_input_statement_type *, lang_statement_list_type *); 623 624 extern bfd_boolean 625 ldlang_override_segment_assignment 626 (struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean); 627 628 #endif 629