1 /* ldlang.h - linker command language support 2 Copyright (C) 1991-2016 Free Software Foundation, Inc. 3 4 This file is part of the GNU Binutils. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21 #ifndef LDLANG_H 22 #define LDLANG_H 23 24 #define DEFAULT_MEMORY_REGION "*default*" 25 26 typedef enum 27 { 28 lang_input_file_is_l_enum, 29 lang_input_file_is_symbols_only_enum, 30 lang_input_file_is_marker_enum, 31 lang_input_file_is_fake_enum, 32 lang_input_file_is_search_file_enum, 33 lang_input_file_is_file_enum 34 } lang_input_file_enum_type; 35 36 struct _fill_type 37 { 38 size_t size; 39 unsigned char data[1]; 40 }; 41 42 typedef struct statement_list 43 { 44 union lang_statement_union * head; 45 union lang_statement_union ** tail; 46 } lang_statement_list_type; 47 48 typedef struct memory_region_name_struct 49 { 50 const char * name; 51 struct memory_region_name_struct * next; 52 } lang_memory_region_name; 53 54 typedef struct memory_region_struct 55 { 56 lang_memory_region_name name_list; 57 struct memory_region_struct *next; 58 union etree_union *origin_exp; 59 bfd_vma origin; 60 bfd_size_type length; 61 union etree_union *length_exp; 62 bfd_vma current; 63 union lang_statement_union *last_os; 64 flagword flags; 65 flagword not_flags; 66 bfd_boolean had_full_message; 67 } lang_memory_region_type; 68 69 enum statement_enum 70 { 71 lang_output_section_statement_enum, 72 lang_assignment_statement_enum, 73 lang_input_statement_enum, 74 lang_address_statement_enum, 75 lang_wild_statement_enum, 76 lang_input_section_enum, 77 lang_object_symbols_statement_enum, 78 lang_fill_statement_enum, 79 lang_data_statement_enum, 80 lang_reloc_statement_enum, 81 lang_target_statement_enum, 82 lang_output_statement_enum, 83 lang_padding_statement_enum, 84 lang_group_statement_enum, 85 lang_insert_statement_enum, 86 lang_constructors_statement_enum 87 }; 88 89 typedef struct lang_statement_header_struct 90 { 91 union lang_statement_union *next; 92 enum statement_enum type; 93 } lang_statement_header_type; 94 95 typedef struct 96 { 97 lang_statement_header_type header; 98 union etree_union *exp; 99 } lang_assignment_statement_type; 100 101 typedef struct lang_target_statement_struct 102 { 103 lang_statement_header_type header; 104 const char *target; 105 } lang_target_statement_type; 106 107 typedef struct lang_output_statement_struct 108 { 109 lang_statement_header_type header; 110 const char *name; 111 } lang_output_statement_type; 112 113 /* Section types specified in a linker script. */ 114 115 enum section_type 116 { 117 normal_section, 118 overlay_section, 119 noload_section, 120 noalloc_section 121 }; 122 123 /* This structure holds a list of program headers describing 124 segments in which this section should be placed. */ 125 126 typedef struct lang_output_section_phdr_list 127 { 128 struct lang_output_section_phdr_list *next; 129 const char *name; 130 bfd_boolean used; 131 } lang_output_section_phdr_list; 132 133 typedef struct lang_output_section_statement_struct 134 { 135 lang_statement_header_type header; 136 lang_statement_list_type children; 137 struct lang_output_section_statement_struct *next; 138 struct lang_output_section_statement_struct *prev; 139 const char *name; 140 asection *bfd_section; 141 lang_memory_region_type *region; 142 lang_memory_region_type *lma_region; 143 fill_type *fill; 144 union etree_union *addr_tree; 145 union etree_union *load_base; 146 147 /* If non-null, an expression to evaluate after setting the section's 148 size. The expression is evaluated inside REGION (above) with '.' 149 set to the end of the section. Used in the last overlay section 150 to move '.' past all the overlaid sections. */ 151 union etree_union *update_dot_tree; 152 153 lang_output_section_phdr_list *phdrs; 154 155 unsigned int block_value; 156 int subsection_alignment; /* Alignment of components. */ 157 int section_alignment; /* Alignment of start of section. */ 158 int constraint; 159 flagword flags; 160 enum section_type sectype; 161 unsigned int processed_vma : 1; 162 unsigned int processed_lma : 1; 163 unsigned int all_input_readonly : 1; 164 /* If this section should be ignored. */ 165 unsigned int ignored : 1; 166 /* If this section should update "dot". Prevents section being ignored. */ 167 unsigned int update_dot : 1; 168 /* If this section uses the alignment of its input sections. */ 169 unsigned int align_lma_with_input : 1; 170 } lang_output_section_statement_type; 171 172 typedef struct 173 { 174 lang_statement_header_type header; 175 } lang_common_statement_type; 176 177 typedef struct 178 { 179 lang_statement_header_type header; 180 } lang_object_symbols_statement_type; 181 182 typedef struct 183 { 184 lang_statement_header_type header; 185 fill_type *fill; 186 int size; 187 asection *output_section; 188 } lang_fill_statement_type; 189 190 typedef struct 191 { 192 lang_statement_header_type header; 193 unsigned int type; 194 union etree_union *exp; 195 bfd_vma value; 196 asection *output_section; 197 bfd_vma output_offset; 198 } lang_data_statement_type; 199 200 /* Generate a reloc in the output file. */ 201 202 typedef struct 203 { 204 lang_statement_header_type header; 205 206 /* Reloc to generate. */ 207 bfd_reloc_code_real_type reloc; 208 209 /* Reloc howto structure. */ 210 reloc_howto_type *howto; 211 212 /* Section to generate reloc against. 213 Exactly one of section and name must be NULL. */ 214 asection *section; 215 216 /* Name of symbol to generate reloc against. 217 Exactly one of section and name must be NULL. */ 218 const char *name; 219 220 /* Expression for addend. */ 221 union etree_union *addend_exp; 222 223 /* Resolved addend. */ 224 bfd_vma addend_value; 225 226 /* Output section where reloc should be performed. */ 227 asection *output_section; 228 229 /* Offset within output section. */ 230 bfd_vma output_offset; 231 } lang_reloc_statement_type; 232 233 struct lang_input_statement_flags 234 { 235 /* 1 means this file was specified in a -l option. */ 236 unsigned int maybe_archive : 1; 237 238 /* 1 means this file was specified in a -l:namespec option. */ 239 unsigned int full_name_provided : 1; 240 241 /* 1 means search a set of directories for this file. */ 242 unsigned int search_dirs : 1; 243 244 /* 1 means this was found when processing a script in the sysroot. */ 245 unsigned int sysrooted : 1; 246 247 /* 1 means this is base file of incremental load. 248 Do not load this file's text or data. 249 Also default text_start to after this file's bss. */ 250 unsigned int just_syms : 1; 251 252 /* Whether to search for this entry as a dynamic archive. */ 253 unsigned int dynamic : 1; 254 255 /* Set if a DT_NEEDED tag should be added not just for the dynamic library 256 explicitly given by this entry but also for any dynamic libraries in 257 this entry's needed list. */ 258 unsigned int add_DT_NEEDED_for_dynamic : 1; 259 260 /* Set if this entry should cause a DT_NEEDED tag only when some 261 regular file references its symbols (ie. --as-needed is in effect). */ 262 unsigned int add_DT_NEEDED_for_regular : 1; 263 264 /* Whether to include the entire contents of an archive. */ 265 unsigned int whole_archive : 1; 266 267 /* Set when bfd opening is successful. */ 268 unsigned int loaded : 1; 269 270 unsigned int real : 1; 271 272 /* Set if the file does not exist. */ 273 unsigned int missing_file : 1; 274 275 /* Set if reloading an archive or --as-needed lib. */ 276 unsigned int reload : 1; 277 278 #ifdef ENABLE_PLUGINS 279 /* Set if the file was claimed by a plugin. */ 280 unsigned int claimed : 1; 281 282 /* Set if the file was claimed from an archive. */ 283 unsigned int claim_archive : 1; 284 285 /* Set if added by the lto plugin add_input_file callback. */ 286 unsigned int lto_output : 1; 287 #endif /* ENABLE_PLUGINS */ 288 289 /* Head of list of pushed flags. */ 290 struct lang_input_statement_flags *pushed; 291 }; 292 293 typedef struct lang_input_statement_struct 294 { 295 lang_statement_header_type header; 296 /* Name of this file. */ 297 const char *filename; 298 /* Name to use for the symbol giving address of text start. 299 Usually the same as filename, but for a file spec'd with 300 -l this is the -l switch itself rather than the filename. */ 301 const char *local_sym_name; 302 303 bfd *the_bfd; 304 305 struct flag_info *section_flag_list; 306 307 /* Point to the next file - whatever it is, wanders up and down 308 archives */ 309 union lang_statement_union *next; 310 311 /* Point to the next file, but skips archive contents. */ 312 union lang_statement_union *next_real_file; 313 314 const char *target; 315 316 struct lang_input_statement_flags flags; 317 } lang_input_statement_type; 318 319 typedef struct 320 { 321 lang_statement_header_type header; 322 asection *section; 323 } lang_input_section_type; 324 325 struct map_symbol_def { 326 struct bfd_link_hash_entry *entry; 327 struct map_symbol_def *next; 328 }; 329 330 /* For input sections, when writing a map file: head / tail of a linked 331 list of hash table entries for symbols defined in this section. */ 332 typedef struct input_section_userdata_struct 333 { 334 struct map_symbol_def *map_symbol_def_head; 335 struct map_symbol_def **map_symbol_def_tail; 336 unsigned long map_symbol_def_count; 337 } input_section_userdata_type; 338 339 #define get_userdata(x) ((x)->userdata) 340 341 342 typedef struct lang_wild_statement_struct lang_wild_statement_type; 343 344 typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *, 345 asection *, struct flag_info *, 346 lang_input_statement_type *, void *); 347 348 typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *, 349 lang_input_statement_type *, 350 callback_t callback, 351 void *data); 352 353 typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *, 354 bfd *, const asection *); 355 356 /* Binary search tree structure to efficiently sort sections by 357 name. */ 358 typedef struct lang_section_bst 359 { 360 asection *section; 361 struct lang_section_bst *left; 362 struct lang_section_bst *right; 363 } lang_section_bst_type; 364 365 struct lang_wild_statement_struct 366 { 367 lang_statement_header_type header; 368 const char *filename; 369 bfd_boolean filenames_sorted; 370 struct wildcard_list *section_list; 371 bfd_boolean keep_sections; 372 lang_statement_list_type children; 373 374 walk_wild_section_handler_t walk_wild_section_handler; 375 struct wildcard_list *handler_data[4]; 376 lang_section_bst_type *tree; 377 struct flag_info *section_flag_list; 378 }; 379 380 typedef struct lang_address_statement_struct 381 { 382 lang_statement_header_type header; 383 const char *section_name; 384 union etree_union *address; 385 const segment_type *segment; 386 } lang_address_statement_type; 387 388 typedef struct 389 { 390 lang_statement_header_type header; 391 bfd_vma output_offset; 392 bfd_size_type size; 393 asection *output_section; 394 fill_type *fill; 395 } lang_padding_statement_type; 396 397 /* A group statement collects a set of libraries together. The 398 libraries are searched multiple times, until no new undefined 399 symbols are found. The effect is to search a group of libraries as 400 though they were a single library. */ 401 402 typedef struct 403 { 404 lang_statement_header_type header; 405 lang_statement_list_type children; 406 } lang_group_statement_type; 407 408 typedef struct 409 { 410 lang_statement_header_type header; 411 const char *where; 412 bfd_boolean is_before; 413 } lang_insert_statement_type; 414 415 typedef union lang_statement_union 416 { 417 lang_statement_header_type header; 418 lang_wild_statement_type wild_statement; 419 lang_data_statement_type data_statement; 420 lang_reloc_statement_type reloc_statement; 421 lang_address_statement_type address_statement; 422 lang_output_section_statement_type output_section_statement; 423 lang_assignment_statement_type assignment_statement; 424 lang_input_statement_type input_statement; 425 lang_target_statement_type target_statement; 426 lang_output_statement_type output_statement; 427 lang_input_section_type input_section; 428 lang_common_statement_type common_statement; 429 lang_object_symbols_statement_type object_symbols_statement; 430 lang_fill_statement_type fill_statement; 431 lang_padding_statement_type padding_statement; 432 lang_group_statement_type group_statement; 433 lang_insert_statement_type insert_statement; 434 } lang_statement_union_type; 435 436 /* This structure holds information about a program header, from the 437 PHDRS command in the linker script. */ 438 439 struct lang_phdr 440 { 441 struct lang_phdr *next; 442 const char *name; 443 unsigned long type; 444 bfd_boolean filehdr; 445 bfd_boolean phdrs; 446 etree_type *at; 447 etree_type *flags; 448 }; 449 450 /* This structure is used to hold a list of sections which may not 451 cross reference each other. */ 452 453 typedef struct lang_nocrossref 454 { 455 struct lang_nocrossref *next; 456 const char *name; 457 } lang_nocrossref_type; 458 459 /* The list of nocrossref lists. */ 460 461 struct lang_nocrossrefs 462 { 463 struct lang_nocrossrefs *next; 464 lang_nocrossref_type *list; 465 bfd_boolean onlyfirst; 466 }; 467 468 /* This structure is used to hold a list of input section names which 469 will not match an output section in the linker script. */ 470 471 struct unique_sections 472 { 473 struct unique_sections *next; 474 const char *name; 475 }; 476 477 /* Used by place_orphan to keep track of orphan sections and statements. */ 478 479 struct orphan_save 480 { 481 const char *name; 482 flagword flags; 483 lang_output_section_statement_type *os; 484 asection **section; 485 lang_statement_union_type **stmt; 486 lang_output_section_statement_type **os_tail; 487 }; 488 489 struct asneeded_minfo 490 { 491 struct asneeded_minfo *next; 492 const char *soname; 493 bfd *ref; 494 const char *name; 495 }; 496 497 extern struct lang_phdr *lang_phdr_list; 498 extern struct lang_nocrossrefs *nocrossref_list; 499 extern const char *output_target; 500 extern lang_output_section_statement_type *abs_output_section; 501 extern lang_statement_list_type lang_output_section_statement; 502 extern struct lang_input_statement_flags input_flags; 503 extern bfd_boolean lang_has_input_file; 504 extern lang_statement_list_type *stat_ptr; 505 extern bfd_boolean delete_output_file_on_failure; 506 507 extern struct bfd_sym_chain entry_symbol; 508 extern const char *entry_section; 509 extern bfd_boolean entry_from_cmdline; 510 extern lang_statement_list_type file_chain; 511 extern lang_statement_list_type input_file_chain; 512 513 extern int lang_statement_iteration; 514 extern struct asneeded_minfo **asneeded_list_tail; 515 516 extern void (*output_bfd_hash_table_free_fn) (struct bfd_link_hash_table *); 517 518 extern void lang_init 519 (void); 520 extern void lang_finish 521 (void); 522 extern lang_memory_region_type * lang_memory_region_lookup 523 (const char * const, bfd_boolean); 524 extern void lang_memory_region_alias 525 (const char *, const char *); 526 extern void lang_map 527 (void); 528 extern void lang_set_flags 529 (lang_memory_region_type *, const char *, int); 530 extern void lang_add_output 531 (const char *, int from_script); 532 extern lang_output_section_statement_type *lang_enter_output_section_statement 533 (const char *, etree_type *, enum section_type, etree_type *, etree_type *, 534 etree_type *, int, int); 535 extern void lang_final 536 (void); 537 extern void lang_relax_sections 538 (bfd_boolean); 539 extern void lang_process 540 (void); 541 extern void lang_section_start 542 (const char *, union etree_union *, const segment_type *); 543 extern void lang_add_entry 544 (const char *, bfd_boolean); 545 extern void lang_default_entry 546 (const char *); 547 extern void lang_add_target 548 (const char *); 549 extern void lang_add_wild 550 (struct wildcard_spec *, struct wildcard_list *, bfd_boolean); 551 extern void lang_add_map 552 (const char *); 553 extern void lang_add_fill 554 (fill_type *); 555 extern lang_assignment_statement_type *lang_add_assignment 556 (union etree_union *); 557 extern void lang_add_attribute 558 (enum statement_enum); 559 extern void lang_startup 560 (const char *); 561 extern void lang_float 562 (bfd_boolean); 563 extern void lang_leave_output_section_statement 564 (fill_type *, const char *, lang_output_section_phdr_list *, 565 const char *); 566 extern void lang_abs_symbol_at_end_of 567 (const char *, const char *); 568 extern void lang_abs_symbol_at_beginning_of 569 (const char *, const char *); 570 extern void lang_statement_append 571 (lang_statement_list_type *, lang_statement_union_type *, 572 lang_statement_union_type **); 573 extern void lang_for_each_input_file 574 (void (*dothis) (lang_input_statement_type *)); 575 extern void lang_for_each_file 576 (void (*dothis) (lang_input_statement_type *)); 577 extern void lang_reset_memory_regions 578 (void); 579 extern void lang_do_assignments 580 (lang_phase_type); 581 582 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \ 583 lang_input_statement_type *statement; \ 584 for (statement = (lang_input_statement_type *) file_chain.head; \ 585 statement != (lang_input_statement_type *) NULL; \ 586 statement = (lang_input_statement_type *) statement->next) \ 587 588 #define lang_output_section_find(NAME) \ 589 lang_output_section_statement_lookup (NAME, 0, FALSE) 590 591 extern void lang_process 592 (void); 593 extern void ldlang_add_file 594 (lang_input_statement_type *); 595 extern lang_output_section_statement_type *lang_output_section_find_by_flags 596 (const asection *, flagword, lang_output_section_statement_type **, 597 lang_match_sec_type_func); 598 extern lang_output_section_statement_type *lang_insert_orphan 599 (asection *, const char *, int, lang_output_section_statement_type *, 600 struct orphan_save *, etree_type *, lang_statement_list_type *); 601 extern lang_input_statement_type *lang_add_input_file 602 (const char *, lang_input_file_enum_type, const char *); 603 extern void lang_add_keepsyms_file 604 (const char *); 605 extern lang_output_section_statement_type *lang_output_section_get 606 (const asection *); 607 extern lang_output_section_statement_type *lang_output_section_statement_lookup 608 (const char *, int, bfd_boolean); 609 extern lang_output_section_statement_type *next_matching_output_section_statement 610 (lang_output_section_statement_type *, int); 611 extern void ldlang_add_undef 612 (const char *const, bfd_boolean); 613 extern void ldlang_add_require_defined 614 (const char *const); 615 extern void lang_add_output_format 616 (const char *, const char *, const char *, int); 617 extern void lang_list_init 618 (lang_statement_list_type *); 619 extern void push_stat_ptr 620 (lang_statement_list_type *); 621 extern void pop_stat_ptr 622 (void); 623 extern void lang_add_data 624 (int type, union etree_union *); 625 extern void lang_add_reloc 626 (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *, 627 union etree_union *); 628 extern void lang_for_each_statement 629 (void (*) (lang_statement_union_type *)); 630 extern void lang_for_each_statement_worker 631 (void (*) (lang_statement_union_type *), lang_statement_union_type *); 632 extern void *stat_alloc 633 (size_t); 634 extern void strip_excluded_output_sections 635 (void); 636 extern void lang_clear_os_map 637 (void); 638 extern void dprint_statement 639 (lang_statement_union_type *, int); 640 extern void lang_size_sections 641 (bfd_boolean *, bfd_boolean); 642 extern void one_lang_size_sections_pass 643 (bfd_boolean *, bfd_boolean); 644 extern void lang_add_insert 645 (const char *, int); 646 extern void lang_enter_group 647 (void); 648 extern void lang_leave_group 649 (void); 650 extern void lang_add_section 651 (lang_statement_list_type *, asection *, 652 struct flag_info *, lang_output_section_statement_type *); 653 extern void lang_new_phdr 654 (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *, 655 etree_type *); 656 extern void lang_add_nocrossref 657 (lang_nocrossref_type *); 658 extern void lang_add_nocrossref_to 659 (lang_nocrossref_type *); 660 extern void lang_enter_overlay 661 (etree_type *, etree_type *); 662 extern void lang_enter_overlay_section 663 (const char *); 664 extern void lang_leave_overlay_section 665 (fill_type *, lang_output_section_phdr_list *); 666 extern void lang_leave_overlay 667 (etree_type *, int, fill_type *, const char *, 668 lang_output_section_phdr_list *, const char *); 669 670 extern struct bfd_elf_version_expr *lang_new_vers_pattern 671 (struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean); 672 extern struct bfd_elf_version_tree *lang_new_vers_node 673 (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *); 674 extern struct bfd_elf_version_deps *lang_add_vers_depend 675 (struct bfd_elf_version_deps *, const char *); 676 extern void lang_register_vers_node 677 (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *); 678 extern void lang_append_dynamic_list (struct bfd_elf_version_expr *); 679 extern void lang_append_dynamic_list_cpp_typeinfo (void); 680 extern void lang_append_dynamic_list_cpp_new (void); 681 extern void lang_add_unique 682 (const char *); 683 extern const char *lang_get_output_target 684 (void); 685 extern void add_excluded_libs (const char *); 686 extern bfd_boolean load_symbols 687 (lang_input_statement_type *, lang_statement_list_type *); 688 689 extern bfd_boolean 690 ldlang_override_segment_assignment 691 (struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean); 692 693 extern void 694 lang_ld_feature (char *); 695 696 extern void 697 lang_print_memory_usage (void); 698 699 extern void 700 lang_add_gc_name (const char *); 701 702 #endif 703
