1 /* BFD COFF object file private structure. 2 Copyright 1990-2013 Free Software Foundation, Inc. 3 Written by Cygnus Support. 4 5 This file is part of BFD, the Binary File Descriptor library. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #include "bfdlink.h" 23 24 /* Object file tdata; access macros. */ 25 26 #define coff_data(bfd) ((bfd)->tdata.coff_obj_data) 27 #define obj_pe(bfd) (coff_data (bfd)->pe) 28 #define obj_symbols(bfd) (coff_data (bfd)->symbols) 29 #define obj_sym_filepos(bfd) (coff_data (bfd)->sym_filepos) 30 #define obj_relocbase(bfd) (coff_data (bfd)->relocbase) 31 #define obj_raw_syments(bfd) (coff_data (bfd)->raw_syments) 32 #define obj_raw_syment_count(bfd) (coff_data (bfd)->raw_syment_count) 33 #define obj_convert(bfd) (coff_data (bfd)->conversion_table) 34 #define obj_conv_table_size(bfd) (coff_data (bfd)->conv_table_size) 35 #define obj_coff_external_syms(bfd) (coff_data (bfd)->external_syms) 36 #define obj_coff_keep_syms(bfd) (coff_data (bfd)->keep_syms) 37 #define obj_coff_strings(bfd) (coff_data (bfd)->strings) 38 #define obj_coff_keep_strings(bfd) (coff_data (bfd)->keep_strings) 39 #define obj_coff_sym_hashes(bfd) (coff_data (bfd)->sym_hashes) 40 #define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written) 41 #define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map) 42 43 /* `Tdata' information kept for COFF files. */ 44 45 typedef struct coff_tdata 46 { 47 struct coff_symbol_struct *symbols; /* Symtab for input bfd. */ 48 unsigned int *conversion_table; 49 int conv_table_size; 50 file_ptr sym_filepos; 51 52 struct coff_ptr_struct *raw_syments; 53 unsigned long raw_syment_count; 54 55 /* These are only valid once writing has begun. */ 56 long int relocbase; 57 58 /* These members communicate important constants about the symbol table 59 to GDB's symbol-reading code. These `constants' unfortunately vary 60 from coff implementation to implementation... */ 61 unsigned local_n_btmask; 62 unsigned local_n_btshft; 63 unsigned local_n_tmask; 64 unsigned local_n_tshift; 65 unsigned local_symesz; 66 unsigned local_auxesz; 67 unsigned local_linesz; 68 69 /* The unswapped external symbols. May be NULL. Read by 70 _bfd_coff_get_external_symbols. */ 71 void * external_syms; 72 /* If this is TRUE, the external_syms may not be freed. */ 73 bfd_boolean keep_syms; 74 75 /* The string table. May be NULL. Read by 76 _bfd_coff_read_string_table. */ 77 char *strings; 78 /* If this is TRUE, the strings may not be freed. */ 79 bfd_boolean keep_strings; 80 /* If this is TRUE, the strings have been written out already. */ 81 bfd_boolean strings_written; 82 83 /* Is this a PE format coff file? */ 84 int pe; 85 /* Used by the COFF backend linker. */ 86 struct coff_link_hash_entry **sym_hashes; 87 88 /* Used by the pe linker for PowerPC. */ 89 int *local_toc_sym_map; 90 91 struct bfd_link_info *link_info; 92 93 /* Used by coff_find_nearest_line. */ 94 void * line_info; 95 96 /* A place to stash dwarf2 info for this bfd. */ 97 void * dwarf2_find_line_info; 98 99 /* The timestamp from the COFF file header. */ 100 long timestamp; 101 102 /* Copy of some of the f_flags bits in the COFF filehdr structure, 103 used by ARM code. */ 104 flagword flags; 105 106 /* coff-stgo32 EXE stub header after BFD tdata has been allocated. Its data 107 is kept in internal_filehdr.go32stub beforehand. */ 108 char *go32stub; 109 } coff_data_type; 110 111 /* Tdata for pe image files. */ 112 typedef struct pe_tdata 113 { 114 coff_data_type coff; 115 struct internal_extra_pe_aouthdr pe_opthdr; 116 int dll; 117 int has_reloc_section; 118 int dont_strip_reloc; 119 bfd_boolean insert_timestamp; 120 bfd_boolean (*in_reloc_p) (bfd *, reloc_howto_type *); 121 flagword real_flags; 122 } pe_data_type; 123 124 #define pe_data(bfd) ((bfd)->tdata.pe_obj_data) 125 126 /* Tdata for XCOFF files. */ 127 128 struct xcoff_tdata 129 { 130 /* Basic COFF information. */ 131 coff_data_type coff; 132 133 /* TRUE if this is an XCOFF64 file. */ 134 bfd_boolean xcoff64; 135 136 /* TRUE if a large a.out header should be generated. */ 137 bfd_boolean full_aouthdr; 138 139 /* TOC value. */ 140 bfd_vma toc; 141 142 /* Index of section holding TOC. */ 143 int sntoc; 144 145 /* Index of section holding entry point. */ 146 int snentry; 147 148 /* .text alignment from optional header. */ 149 int text_align_power; 150 151 /* .data alignment from optional header. */ 152 int data_align_power; 153 154 /* modtype from optional header. */ 155 short modtype; 156 157 /* cputype from optional header. */ 158 short cputype; 159 160 /* maxdata from optional header. */ 161 bfd_vma maxdata; 162 163 /* maxstack from optional header. */ 164 bfd_vma maxstack; 165 166 /* Used by the XCOFF backend linker. */ 167 asection **csects; 168 long *debug_indices; 169 unsigned int *lineno_counts; 170 unsigned int import_file_id; 171 }; 172 173 #define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data) 174 175 /* We take the address of the first element of an asymbol to ensure that the 176 macro is only ever applied to an asymbol. */ 177 #define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd))) 178 179 /* The used_by_bfd field of a section may be set to a pointer to this 180 structure. */ 181 182 struct coff_section_tdata 183 { 184 /* The relocs, swapped into COFF internal form. This may be NULL. */ 185 struct internal_reloc *relocs; 186 /* If this is TRUE, the relocs entry may not be freed. */ 187 bfd_boolean keep_relocs; 188 /* The section contents. This may be NULL. */ 189 bfd_byte *contents; 190 /* If this is TRUE, the contents entry may not be freed. */ 191 bfd_boolean keep_contents; 192 /* Information cached by coff_find_nearest_line. */ 193 bfd_vma offset; 194 unsigned int i; 195 const char *function; 196 /* Optional information about a COMDAT entry; NULL if not COMDAT. */ 197 struct coff_comdat_info *comdat; 198 int line_base; 199 /* A pointer used for .stab linking optimizations. */ 200 void * stab_info; 201 /* Available for individual backends. */ 202 void * tdata; 203 }; 204 205 /* An accessor macro for the coff_section_tdata structure. */ 206 #define coff_section_data(abfd, sec) \ 207 ((struct coff_section_tdata *) (sec)->used_by_bfd) 208 209 /* Tdata for sections in XCOFF files. This is used by the linker. */ 210 211 struct xcoff_section_tdata 212 { 213 /* Used for XCOFF csects created by the linker; points to the real 214 XCOFF section which contains this csect. */ 215 asection *enclosing; 216 /* The lineno_count field for the enclosing section, because we are 217 going to clobber it there. */ 218 unsigned int lineno_count; 219 /* The first and last symbol indices for symbols used by this csect. */ 220 unsigned long first_symndx; 221 unsigned long last_symndx; 222 }; 223 224 /* An accessor macro the xcoff_section_tdata structure. */ 225 #define xcoff_section_data(abfd, sec) \ 226 ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata) 227 228 /* Tdata for sections in PE files. */ 229 230 struct pei_section_tdata 231 { 232 /* The virtual size of the section. */ 233 bfd_size_type virt_size; 234 /* The PE section flags. */ 235 long pe_flags; 236 }; 237 238 /* An accessor macro for the pei_section_tdata structure. */ 239 #define pei_section_data(abfd, sec) \ 240 ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata) 241 242 /* COFF linker hash table entries. */ 243 244 struct coff_link_hash_entry 245 { 246 struct bfd_link_hash_entry root; 247 248 /* Symbol index in output file. Set to -1 initially. Set to -2 if 249 there is a reloc against this symbol. */ 250 long indx; 251 252 /* Symbol type. */ 253 unsigned short type; 254 255 /* Symbol class. */ 256 unsigned char symbol_class; 257 258 /* Number of auxiliary entries. */ 259 char numaux; 260 261 /* BFD to take auxiliary entries from. */ 262 bfd *auxbfd; 263 264 /* Pointer to array of auxiliary entries, if any. */ 265 union internal_auxent *aux; 266 267 /* Flag word; legal values follow. */ 268 unsigned short coff_link_hash_flags; 269 /* Symbol is a PE section symbol. */ 270 #define COFF_LINK_HASH_PE_SECTION_SYMBOL (01) 271 }; 272 273 /* COFF linker hash table. */ 274 275 struct coff_link_hash_table 276 { 277 struct bfd_link_hash_table root; 278 /* A pointer to information used to link stabs in sections. */ 279 struct stab_info stab_info; 280 }; 281 282 /* Look up an entry in a COFF linker hash table. */ 283 284 #define coff_link_hash_lookup(table, string, create, copy, follow) \ 285 ((struct coff_link_hash_entry *) \ 286 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 287 (copy), (follow))) 288 289 /* Traverse a COFF linker hash table. */ 290 291 #define coff_link_hash_traverse(table, func, info) \ 292 (bfd_link_hash_traverse \ 293 (&(table)->root, \ 294 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 295 (info))) 296 297 /* Get the COFF linker hash table from a link_info structure. */ 298 299 #define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash)) 300 301 /* Functions in coffgen.c. */ 302 extern const bfd_target *coff_object_p 303 (bfd *); 304 extern struct bfd_section *coff_section_from_bfd_index 305 (bfd *, int); 306 extern long coff_get_symtab_upper_bound 307 (bfd *); 308 extern long coff_canonicalize_symtab 309 (bfd *, asymbol **); 310 extern int coff_count_linenumbers 311 (bfd *); 312 extern struct coff_symbol_struct *coff_symbol_from 313 (bfd *, asymbol *); 314 extern bfd_boolean coff_renumber_symbols 315 (bfd *, int *); 316 extern void coff_mangle_symbols 317 (bfd *); 318 extern bfd_boolean coff_write_symbols 319 (bfd *); 320 extern bfd_boolean coff_write_alien_symbol 321 (bfd *, asymbol *, struct internal_syment *, bfd_vma *, 322 bfd_size_type *, asection **, bfd_size_type *); 323 extern bfd_boolean coff_write_linenumbers 324 (bfd *); 325 extern alent *coff_get_lineno 326 (bfd *, asymbol *); 327 extern asymbol *coff_section_symbol 328 (bfd *, char *); 329 extern bfd_boolean _bfd_coff_get_external_symbols 330 (bfd *); 331 extern const char *_bfd_coff_read_string_table 332 (bfd *); 333 extern bfd_boolean _bfd_coff_free_symbols 334 (bfd *); 335 extern struct coff_ptr_struct *coff_get_normalized_symtab 336 (bfd *); 337 extern long coff_get_reloc_upper_bound 338 (bfd *, sec_ptr); 339 extern asymbol *coff_make_empty_symbol 340 (bfd *); 341 extern void coff_print_symbol 342 (bfd *, void * filep, asymbol *, bfd_print_symbol_type); 343 extern void coff_get_symbol_info 344 (bfd *, asymbol *, symbol_info *ret); 345 extern bfd_boolean _bfd_coff_is_local_label_name 346 (bfd *, const char *); 347 extern asymbol *coff_bfd_make_debug_symbol 348 (bfd *, void *, unsigned long); 349 extern bfd_boolean coff_find_nearest_line 350 (bfd *, asection *, asymbol **, bfd_vma, const char **, 351 const char **, unsigned int *); 352 extern bfd_boolean coff_find_nearest_line_discriminator 353 (bfd *, asection *, asymbol **, bfd_vma, const char **, 354 const char **, unsigned int *, unsigned int *); 355 struct dwarf_debug_section; 356 extern bfd_boolean coff_find_nearest_line_with_names 357 (bfd *, const struct dwarf_debug_section *, asection *, asymbol **, 358 bfd_vma, const char **, const char **, unsigned int *); 359 extern bfd_boolean coff_find_inliner_info 360 (bfd *, const char **, const char **, unsigned int *); 361 extern int coff_sizeof_headers 362 (bfd *, struct bfd_link_info *); 363 extern bfd_boolean bfd_coff_reloc16_relax_section 364 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); 365 extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents 366 (bfd *, struct bfd_link_info *, struct bfd_link_order *, 367 bfd_byte *, bfd_boolean, asymbol **); 368 extern bfd_vma bfd_coff_reloc16_get_value 369 (arelent *, struct bfd_link_info *, asection *); 370 extern void bfd_perform_slip 371 (bfd *, unsigned int, asection *, bfd_vma); 372 373 /* Functions and types in cofflink.c. */ 374 375 #define STRING_SIZE_SIZE 4 376 377 /* We use a hash table to merge identical enum, struct, and union 378 definitions in the linker. */ 379 380 /* Information we keep for a single element (an enum value, a 381 structure or union field) in the debug merge hash table. */ 382 383 struct coff_debug_merge_element 384 { 385 /* Next element. */ 386 struct coff_debug_merge_element *next; 387 388 /* Name. */ 389 const char *name; 390 391 /* Type. */ 392 unsigned int type; 393 394 /* Symbol index for complex type. */ 395 long tagndx; 396 }; 397 398 /* A linked list of debug merge entries for a given name. */ 399 400 struct coff_debug_merge_type 401 { 402 /* Next type with the same name. */ 403 struct coff_debug_merge_type *next; 404 405 /* Class of type. */ 406 int type_class; 407 408 /* Symbol index where this type is defined. */ 409 long indx; 410 411 /* List of elements. */ 412 struct coff_debug_merge_element *elements; 413 }; 414 415 /* Information we store in the debug merge hash table. */ 416 417 struct coff_debug_merge_hash_entry 418 { 419 struct bfd_hash_entry root; 420 421 /* A list of types with this name. */ 422 struct coff_debug_merge_type *types; 423 }; 424 425 /* The debug merge hash table. */ 426 427 struct coff_debug_merge_hash_table 428 { 429 struct bfd_hash_table root; 430 }; 431 432 /* Initialize a COFF debug merge hash table. */ 433 434 #define coff_debug_merge_hash_table_init(table) \ 435 (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \ 436 sizeof (struct coff_debug_merge_hash_entry))) 437 438 /* Free a COFF debug merge hash table. */ 439 440 #define coff_debug_merge_hash_table_free(table) \ 441 (bfd_hash_table_free (&(table)->root)) 442 443 /* Look up an entry in a COFF debug merge hash table. */ 444 445 #define coff_debug_merge_hash_lookup(table, string, create, copy) \ 446 ((struct coff_debug_merge_hash_entry *) \ 447 bfd_hash_lookup (&(table)->root, (string), (create), (copy))) 448 449 /* Information we keep for each section in the output file when doing 450 a relocatable link. */ 451 452 struct coff_link_section_info 453 { 454 /* The relocs to be output. */ 455 struct internal_reloc *relocs; 456 /* For each reloc against a global symbol whose index was not known 457 when the reloc was handled, the global hash table entry. */ 458 struct coff_link_hash_entry **rel_hashes; 459 }; 460 461 /* Information that we pass around while doing the final link step. */ 462 463 struct coff_final_link_info 464 { 465 /* General link information. */ 466 struct bfd_link_info *info; 467 /* Output BFD. */ 468 bfd *output_bfd; 469 /* Used to indicate failure in traversal routine. */ 470 bfd_boolean failed; 471 /* If doing "task linking" set only during the time when we want the 472 global symbol writer to convert the storage class of defined global 473 symbols from global to static. */ 474 bfd_boolean global_to_static; 475 /* Hash table for long symbol names. */ 476 struct bfd_strtab_hash *strtab; 477 /* When doing a relocatable link, an array of information kept for 478 each output section, indexed by the target_index field. */ 479 struct coff_link_section_info *section_info; 480 /* Symbol index of last C_FILE symbol (-1 if none). */ 481 long last_file_index; 482 /* Contents of last C_FILE symbol. */ 483 struct internal_syment last_file; 484 /* Symbol index of first aux entry of last .bf symbol with an empty 485 endndx field (-1 if none). */ 486 long last_bf_index; 487 /* Contents of last_bf_index aux entry. */ 488 union internal_auxent last_bf; 489 /* Hash table used to merge debug information. */ 490 struct coff_debug_merge_hash_table debug_merge; 491 /* Buffer large enough to hold swapped symbols of any input file. */ 492 struct internal_syment *internal_syms; 493 /* Buffer large enough to hold sections of symbols of any input file. */ 494 asection **sec_ptrs; 495 /* Buffer large enough to hold output indices of symbols of any 496 input file. */ 497 long *sym_indices; 498 /* Buffer large enough to hold output symbols for any input file. */ 499 bfd_byte *outsyms; 500 /* Buffer large enough to hold external line numbers for any input 501 section. */ 502 bfd_byte *linenos; 503 /* Buffer large enough to hold any input section. */ 504 bfd_byte *contents; 505 /* Buffer large enough to hold external relocs of any input section. */ 506 bfd_byte *external_relocs; 507 /* Buffer large enough to hold swapped relocs of any input section. */ 508 struct internal_reloc *internal_relocs; 509 }; 510 511 /* Most COFF variants have no way to record the alignment of a 512 section. This struct is used to set a specific alignment based on 513 the name of the section. */ 514 515 struct coff_section_alignment_entry 516 { 517 /* The section name. */ 518 const char *name; 519 520 /* This is either (unsigned int) -1, indicating that the section 521 name must match exactly, or it is the number of letters which 522 must match at the start of the name. */ 523 unsigned int comparison_length; 524 525 /* These macros may be used to fill in the first two fields in a 526 structure initialization. */ 527 #define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1) 528 #define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1) 529 530 /* Only use this entry if the default section alignment for this 531 target is at least that much (as a power of two). If this field 532 is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ 533 unsigned int default_alignment_min; 534 535 /* Only use this entry if the default section alignment for this 536 target is no greater than this (as a power of two). If this 537 field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ 538 unsigned int default_alignment_max; 539 540 #define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1) 541 542 /* The desired alignment for this section (as a power of two). */ 543 unsigned int alignment_power; 544 }; 545 546 extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc 547 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 548 extern bfd_boolean _bfd_coff_link_hash_table_init 549 (struct coff_link_hash_table *, bfd *, 550 struct bfd_hash_entry *(*) (struct bfd_hash_entry *, 551 struct bfd_hash_table *, 552 const char *), 553 unsigned int); 554 extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create 555 (bfd *); 556 extern const char *_bfd_coff_internal_syment_name 557 (bfd *, const struct internal_syment *, char *); 558 extern bfd_boolean _bfd_coff_section_already_linked 559 (bfd *, asection *, struct bfd_link_info *); 560 extern bfd_boolean _bfd_coff_link_add_symbols 561 (bfd *, struct bfd_link_info *); 562 extern bfd_boolean _bfd_coff_final_link 563 (bfd *, struct bfd_link_info *); 564 extern struct internal_reloc *_bfd_coff_read_internal_relocs 565 (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean, 566 struct internal_reloc *); 567 extern bfd_boolean _bfd_coff_generic_relocate_section 568 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 569 struct internal_reloc *, struct internal_syment *, asection **); 570 extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc 571 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 572 extern bfd_boolean _bfd_coff_write_global_sym 573 (struct bfd_hash_entry *, void *); 574 extern bfd_boolean _bfd_coff_write_task_globals 575 (struct coff_link_hash_entry *, void *); 576 extern bfd_boolean _bfd_coff_link_input_bfd 577 (struct coff_final_link_info *, bfd *); 578 extern bfd_boolean _bfd_coff_reloc_link_order 579 (bfd *, struct coff_final_link_info *, asection *, 580 struct bfd_link_order *); 581 582 583 #define coff_get_section_contents_in_window \ 584 _bfd_generic_get_section_contents_in_window 585 586 /* Functions in xcofflink.c. */ 587 588 extern long _bfd_xcoff_get_dynamic_symtab_upper_bound 589 (bfd *); 590 extern long _bfd_xcoff_canonicalize_dynamic_symtab 591 (bfd *, asymbol **); 592 extern long _bfd_xcoff_get_dynamic_reloc_upper_bound 593 (bfd *); 594 extern long _bfd_xcoff_canonicalize_dynamic_reloc 595 (bfd *, arelent **, asymbol **); 596 extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create 597 (bfd *); 598 extern void _bfd_xcoff_bfd_link_hash_table_free 599 (struct bfd_link_hash_table *); 600 extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols 601 (bfd *, struct bfd_link_info *); 602 extern bfd_boolean _bfd_xcoff_bfd_final_link 603 (bfd *, struct bfd_link_info *); 604 extern bfd_boolean _bfd_xcoff_define_common_symbol 605 (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *); 606 extern bfd_boolean _bfd_ppc_xcoff_relocate_section 607 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 608 struct internal_reloc *, struct internal_syment *, asection **); 609 610 /* Functions in coff-ppc.c. FIXME: These are called by pe.em in the 611 linker, and so should start with bfd and be declared in bfd.h. */ 612 613 extern bfd_boolean ppc_allocate_toc_section 614 (struct bfd_link_info *); 615 extern bfd_boolean ppc_process_before_allocation 616 (bfd *, struct bfd_link_info *); 617