1 /* BFD COFF object file private structure. 2 Copyright (C) 1990-2014 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_strings_len(bfd) (coff_data (bfd)->strings_len) 39 #define obj_coff_keep_strings(bfd) (coff_data (bfd)->keep_strings) 40 #define obj_coff_sym_hashes(bfd) (coff_data (bfd)->sym_hashes) 41 #define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written) 42 #define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map) 43 44 /* `Tdata' information kept for COFF files. */ 45 46 typedef struct coff_tdata 47 { 48 struct coff_symbol_struct *symbols; /* Symtab for input bfd. */ 49 unsigned int *conversion_table; 50 int conv_table_size; 51 file_ptr sym_filepos; 52 53 struct coff_ptr_struct *raw_syments; 54 unsigned long raw_syment_count; 55 56 /* These are only valid once writing has begun. */ 57 unsigned long int relocbase; 58 59 /* These members communicate important constants about the symbol table 60 to GDB's symbol-reading code. These `constants' unfortunately vary 61 from coff implementation to implementation... */ 62 unsigned local_n_btmask; 63 unsigned local_n_btshft; 64 unsigned local_n_tmask; 65 unsigned local_n_tshift; 66 unsigned local_symesz; 67 unsigned local_auxesz; 68 unsigned local_linesz; 69 70 /* The unswapped external symbols. May be NULL. Read by 71 _bfd_coff_get_external_symbols. */ 72 void * external_syms; 73 /* If this is TRUE, the external_syms may not be freed. */ 74 bfd_boolean keep_syms; 75 76 /* The string table. May be NULL. Read by 77 _bfd_coff_read_string_table. */ 78 char *strings; 79 /* The length of the strings table. For error checking. */ 80 bfd_size_type strings_len; 81 /* If this is TRUE, the strings may not be freed. */ 82 bfd_boolean keep_strings; 83 /* If this is TRUE, the strings have been written out already. */ 84 bfd_boolean strings_written; 85 86 /* Is this a PE format coff file? */ 87 int pe; 88 /* Used by the COFF backend linker. */ 89 struct coff_link_hash_entry **sym_hashes; 90 91 /* Used by the pe linker for PowerPC. */ 92 int *local_toc_sym_map; 93 94 struct bfd_link_info *link_info; 95 96 /* Used by coff_find_nearest_line. */ 97 void * line_info; 98 99 /* A place to stash dwarf2 info for this bfd. */ 100 void * dwarf2_find_line_info; 101 102 /* The timestamp from the COFF file header. */ 103 long timestamp; 104 105 /* Copy of some of the f_flags bits in the COFF filehdr structure, 106 used by ARM code. */ 107 flagword flags; 108 109 /* coff-stgo32 EXE stub header after BFD tdata has been allocated. Its data 110 is kept in internal_filehdr.go32stub beforehand. */ 111 char *go32stub; 112 } coff_data_type; 113 114 /* Tdata for pe image files. */ 115 typedef struct pe_tdata 116 { 117 coff_data_type coff; 118 struct internal_extra_pe_aouthdr pe_opthdr; 119 int dll; 120 int has_reloc_section; 121 int dont_strip_reloc; 122 bfd_boolean insert_timestamp; 123 bfd_boolean (*in_reloc_p) (bfd *, reloc_howto_type *); 124 flagword real_flags; 125 126 /* Build-id info. */ 127 struct 128 { 129 bfd_boolean (*after_write_object_contents) (bfd *); 130 const char *style; 131 asection *sec; 132 } build_id; 133 } pe_data_type; 134 135 #define pe_data(bfd) ((bfd)->tdata.pe_obj_data) 136 137 /* Tdata for XCOFF files. */ 138 139 struct xcoff_tdata 140 { 141 /* Basic COFF information. */ 142 coff_data_type coff; 143 144 /* TRUE if this is an XCOFF64 file. */ 145 bfd_boolean xcoff64; 146 147 /* TRUE if a large a.out header should be generated. */ 148 bfd_boolean full_aouthdr; 149 150 /* TOC value. */ 151 bfd_vma toc; 152 153 /* Index of section holding TOC. */ 154 int sntoc; 155 156 /* Index of section holding entry point. */ 157 int snentry; 158 159 /* .text alignment from optional header. */ 160 int text_align_power; 161 162 /* .data alignment from optional header. */ 163 int data_align_power; 164 165 /* modtype from optional header. */ 166 short modtype; 167 168 /* cputype from optional header. */ 169 short cputype; 170 171 /* maxdata from optional header. */ 172 bfd_vma maxdata; 173 174 /* maxstack from optional header. */ 175 bfd_vma maxstack; 176 177 /* Used by the XCOFF backend linker. */ 178 asection **csects; 179 long *debug_indices; 180 unsigned int *lineno_counts; 181 unsigned int import_file_id; 182 }; 183 184 #define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data) 185 186 /* We take the address of the first element of an asymbol to ensure that the 187 macro is only ever applied to an asymbol. */ 188 #define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd))) 189 190 /* The used_by_bfd field of a section may be set to a pointer to this 191 structure. */ 192 193 struct coff_section_tdata 194 { 195 /* The relocs, swapped into COFF internal form. This may be NULL. */ 196 struct internal_reloc *relocs; 197 /* If this is TRUE, the relocs entry may not be freed. */ 198 bfd_boolean keep_relocs; 199 /* The section contents. This may be NULL. */ 200 bfd_byte *contents; 201 /* If this is TRUE, the contents entry may not be freed. */ 202 bfd_boolean keep_contents; 203 /* Information cached by coff_find_nearest_line. */ 204 bfd_vma offset; 205 unsigned int i; 206 const char *function; 207 /* Optional information about a COMDAT entry; NULL if not COMDAT. */ 208 struct coff_comdat_info *comdat; 209 int line_base; 210 /* A pointer used for .stab linking optimizations. */ 211 void * stab_info; 212 /* Available for individual backends. */ 213 void * tdata; 214 }; 215 216 /* An accessor macro for the coff_section_tdata structure. */ 217 #define coff_section_data(abfd, sec) \ 218 ((struct coff_section_tdata *) (sec)->used_by_bfd) 219 220 /* Tdata for sections in XCOFF files. This is used by the linker. */ 221 222 struct xcoff_section_tdata 223 { 224 /* Used for XCOFF csects created by the linker; points to the real 225 XCOFF section which contains this csect. */ 226 asection *enclosing; 227 /* The lineno_count field for the enclosing section, because we are 228 going to clobber it there. */ 229 unsigned int lineno_count; 230 /* The first and last symbol indices for symbols used by this csect. */ 231 unsigned long first_symndx; 232 unsigned long last_symndx; 233 }; 234 235 /* An accessor macro the xcoff_section_tdata structure. */ 236 #define xcoff_section_data(abfd, sec) \ 237 ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata) 238 239 /* Tdata for sections in PE files. */ 240 241 struct pei_section_tdata 242 { 243 /* The virtual size of the section. */ 244 bfd_size_type virt_size; 245 /* The PE section flags. */ 246 long pe_flags; 247 }; 248 249 /* An accessor macro for the pei_section_tdata structure. */ 250 #define pei_section_data(abfd, sec) \ 251 ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata) 252 253 /* COFF linker hash table entries. */ 254 255 struct coff_link_hash_entry 256 { 257 struct bfd_link_hash_entry root; 258 259 /* Symbol index in output file. Set to -1 initially. Set to -2 if 260 there is a reloc against this symbol. */ 261 long indx; 262 263 /* Symbol type. */ 264 unsigned short type; 265 266 /* Symbol class. */ 267 unsigned char symbol_class; 268 269 /* Number of auxiliary entries. */ 270 char numaux; 271 272 /* BFD to take auxiliary entries from. */ 273 bfd *auxbfd; 274 275 /* Pointer to array of auxiliary entries, if any. */ 276 union internal_auxent *aux; 277 278 /* Flag word; legal values follow. */ 279 unsigned short coff_link_hash_flags; 280 /* Symbol is a PE section symbol. */ 281 #define COFF_LINK_HASH_PE_SECTION_SYMBOL (01) 282 }; 283 284 /* COFF linker hash table. */ 285 286 struct coff_link_hash_table 287 { 288 struct bfd_link_hash_table root; 289 /* A pointer to information used to link stabs in sections. */ 290 struct stab_info stab_info; 291 }; 292 293 /* Look up an entry in a COFF linker hash table. */ 294 295 #define coff_link_hash_lookup(table, string, create, copy, follow) \ 296 ((struct coff_link_hash_entry *) \ 297 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 298 (copy), (follow))) 299 300 /* Traverse a COFF linker hash table. */ 301 302 #define coff_link_hash_traverse(table, func, info) \ 303 (bfd_link_hash_traverse \ 304 (&(table)->root, \ 305 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 306 (info))) 307 308 /* Get the COFF linker hash table from a link_info structure. */ 309 310 #define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash)) 311 312 /* Functions in coffgen.c. */ 313 extern const bfd_target *coff_object_p 314 (bfd *); 315 extern struct bfd_section *coff_section_from_bfd_index 316 (bfd *, int); 317 extern long coff_get_symtab_upper_bound 318 (bfd *); 319 extern long coff_canonicalize_symtab 320 (bfd *, asymbol **); 321 extern int coff_count_linenumbers 322 (bfd *); 323 extern struct coff_symbol_struct *coff_symbol_from 324 (bfd *, asymbol *); 325 extern bfd_boolean coff_renumber_symbols 326 (bfd *, int *); 327 extern void coff_mangle_symbols 328 (bfd *); 329 extern bfd_boolean coff_write_symbols 330 (bfd *); 331 extern bfd_boolean coff_write_alien_symbol 332 (bfd *, asymbol *, struct internal_syment *, bfd_vma *, 333 bfd_size_type *, asection **, bfd_size_type *); 334 extern bfd_boolean coff_write_linenumbers 335 (bfd *); 336 extern alent *coff_get_lineno 337 (bfd *, asymbol *); 338 extern asymbol *coff_section_symbol 339 (bfd *, char *); 340 extern bfd_boolean _bfd_coff_get_external_symbols 341 (bfd *); 342 extern const char *_bfd_coff_read_string_table 343 (bfd *); 344 extern bfd_boolean _bfd_coff_free_symbols 345 (bfd *); 346 extern struct coff_ptr_struct *coff_get_normalized_symtab 347 (bfd *); 348 extern long coff_get_reloc_upper_bound 349 (bfd *, sec_ptr); 350 extern asymbol *coff_make_empty_symbol 351 (bfd *); 352 extern void coff_print_symbol 353 (bfd *, void * filep, asymbol *, bfd_print_symbol_type); 354 extern void coff_get_symbol_info 355 (bfd *, asymbol *, symbol_info *ret); 356 extern bfd_boolean _bfd_coff_is_local_label_name 357 (bfd *, const char *); 358 extern asymbol *coff_bfd_make_debug_symbol 359 (bfd *, void *, unsigned long); 360 extern bfd_boolean coff_find_nearest_line 361 (bfd *, asymbol **, asection *, bfd_vma, 362 const char **, const char **, unsigned int *, unsigned int *); 363 #define coff_find_line _bfd_nosymbols_find_line 364 struct dwarf_debug_section; 365 extern bfd_boolean coff_find_nearest_line_with_names 366 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **, 367 unsigned int *, const struct dwarf_debug_section *); 368 extern bfd_boolean coff_find_inliner_info 369 (bfd *, const char **, const char **, unsigned int *); 370 extern int coff_sizeof_headers 371 (bfd *, struct bfd_link_info *); 372 extern bfd_boolean bfd_coff_reloc16_relax_section 373 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); 374 extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents 375 (bfd *, struct bfd_link_info *, struct bfd_link_order *, 376 bfd_byte *, bfd_boolean, asymbol **); 377 extern bfd_vma bfd_coff_reloc16_get_value 378 (arelent *, struct bfd_link_info *, asection *); 379 extern void bfd_perform_slip 380 (bfd *, unsigned int, asection *, bfd_vma); 381 382 /* Functions and types in cofflink.c. */ 383 384 #define STRING_SIZE_SIZE 4 385 386 /* We use a hash table to merge identical enum, struct, and union 387 definitions in the linker. */ 388 389 /* Information we keep for a single element (an enum value, a 390 structure or union field) in the debug merge hash table. */ 391 392 struct coff_debug_merge_element 393 { 394 /* Next element. */ 395 struct coff_debug_merge_element *next; 396 397 /* Name. */ 398 const char *name; 399 400 /* Type. */ 401 unsigned int type; 402 403 /* Symbol index for complex type. */ 404 long tagndx; 405 }; 406 407 /* A linked list of debug merge entries for a given name. */ 408 409 struct coff_debug_merge_type 410 { 411 /* Next type with the same name. */ 412 struct coff_debug_merge_type *next; 413 414 /* Class of type. */ 415 int type_class; 416 417 /* Symbol index where this type is defined. */ 418 long indx; 419 420 /* List of elements. */ 421 struct coff_debug_merge_element *elements; 422 }; 423 424 /* Information we store in the debug merge hash table. */ 425 426 struct coff_debug_merge_hash_entry 427 { 428 struct bfd_hash_entry root; 429 430 /* A list of types with this name. */ 431 struct coff_debug_merge_type *types; 432 }; 433 434 /* The debug merge hash table. */ 435 436 struct coff_debug_merge_hash_table 437 { 438 struct bfd_hash_table root; 439 }; 440 441 /* Initialize a COFF debug merge hash table. */ 442 443 #define coff_debug_merge_hash_table_init(table) \ 444 (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \ 445 sizeof (struct coff_debug_merge_hash_entry))) 446 447 /* Free a COFF debug merge hash table. */ 448 449 #define coff_debug_merge_hash_table_free(table) \ 450 (bfd_hash_table_free (&(table)->root)) 451 452 /* Look up an entry in a COFF debug merge hash table. */ 453 454 #define coff_debug_merge_hash_lookup(table, string, create, copy) \ 455 ((struct coff_debug_merge_hash_entry *) \ 456 bfd_hash_lookup (&(table)->root, (string), (create), (copy))) 457 458 /* Information we keep for each section in the output file when doing 459 a relocatable link. */ 460 461 struct coff_link_section_info 462 { 463 /* The relocs to be output. */ 464 struct internal_reloc *relocs; 465 /* For each reloc against a global symbol whose index was not known 466 when the reloc was handled, the global hash table entry. */ 467 struct coff_link_hash_entry **rel_hashes; 468 }; 469 470 /* Information that we pass around while doing the final link step. */ 471 472 struct coff_final_link_info 473 { 474 /* General link information. */ 475 struct bfd_link_info *info; 476 /* Output BFD. */ 477 bfd *output_bfd; 478 /* Used to indicate failure in traversal routine. */ 479 bfd_boolean failed; 480 /* If doing "task linking" set only during the time when we want the 481 global symbol writer to convert the storage class of defined global 482 symbols from global to static. */ 483 bfd_boolean global_to_static; 484 /* Hash table for long symbol names. */ 485 struct bfd_strtab_hash *strtab; 486 /* When doing a relocatable link, an array of information kept for 487 each output section, indexed by the target_index field. */ 488 struct coff_link_section_info *section_info; 489 /* Symbol index of last C_FILE symbol (-1 if none). */ 490 long last_file_index; 491 /* Contents of last C_FILE symbol. */ 492 struct internal_syment last_file; 493 /* Symbol index of first aux entry of last .bf symbol with an empty 494 endndx field (-1 if none). */ 495 long last_bf_index; 496 /* Contents of last_bf_index aux entry. */ 497 union internal_auxent last_bf; 498 /* Hash table used to merge debug information. */ 499 struct coff_debug_merge_hash_table debug_merge; 500 /* Buffer large enough to hold swapped symbols of any input file. */ 501 struct internal_syment *internal_syms; 502 /* Buffer large enough to hold sections of symbols of any input file. */ 503 asection **sec_ptrs; 504 /* Buffer large enough to hold output indices of symbols of any 505 input file. */ 506 long *sym_indices; 507 /* Buffer large enough to hold output symbols for any input file. */ 508 bfd_byte *outsyms; 509 /* Buffer large enough to hold external line numbers for any input 510 section. */ 511 bfd_byte *linenos; 512 /* Buffer large enough to hold any input section. */ 513 bfd_byte *contents; 514 /* Buffer large enough to hold external relocs of any input section. */ 515 bfd_byte *external_relocs; 516 /* Buffer large enough to hold swapped relocs of any input section. */ 517 struct internal_reloc *internal_relocs; 518 }; 519 520 /* Most COFF variants have no way to record the alignment of a 521 section. This struct is used to set a specific alignment based on 522 the name of the section. */ 523 524 struct coff_section_alignment_entry 525 { 526 /* The section name. */ 527 const char *name; 528 529 /* This is either (unsigned int) -1, indicating that the section 530 name must match exactly, or it is the number of letters which 531 must match at the start of the name. */ 532 unsigned int comparison_length; 533 534 /* These macros may be used to fill in the first two fields in a 535 structure initialization. */ 536 #define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1) 537 #define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1) 538 539 /* Only use this entry if the default section alignment for this 540 target is at least that much (as a power of two). If this field 541 is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ 542 unsigned int default_alignment_min; 543 544 /* Only use this entry if the default section alignment for this 545 target is no greater than this (as a power of two). If this 546 field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ 547 unsigned int default_alignment_max; 548 549 #define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1) 550 551 /* The desired alignment for this section (as a power of two). */ 552 unsigned int alignment_power; 553 }; 554 555 extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc 556 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 557 extern bfd_boolean _bfd_coff_link_hash_table_init 558 (struct coff_link_hash_table *, bfd *, 559 struct bfd_hash_entry *(*) (struct bfd_hash_entry *, 560 struct bfd_hash_table *, 561 const char *), 562 unsigned int); 563 extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create 564 (bfd *); 565 extern const char *_bfd_coff_internal_syment_name 566 (bfd *, const struct internal_syment *, char *); 567 extern bfd_boolean _bfd_coff_section_already_linked 568 (bfd *, asection *, struct bfd_link_info *); 569 extern bfd_boolean _bfd_coff_link_add_symbols 570 (bfd *, struct bfd_link_info *); 571 extern bfd_boolean _bfd_coff_final_link 572 (bfd *, struct bfd_link_info *); 573 extern struct internal_reloc *_bfd_coff_read_internal_relocs 574 (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean, 575 struct internal_reloc *); 576 extern bfd_boolean _bfd_coff_generic_relocate_section 577 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 578 struct internal_reloc *, struct internal_syment *, asection **); 579 extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc 580 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 581 extern bfd_boolean _bfd_coff_write_global_sym 582 (struct bfd_hash_entry *, void *); 583 extern bfd_boolean _bfd_coff_write_task_globals 584 (struct coff_link_hash_entry *, void *); 585 extern bfd_boolean _bfd_coff_link_input_bfd 586 (struct coff_final_link_info *, bfd *); 587 extern bfd_boolean _bfd_coff_reloc_link_order 588 (bfd *, struct coff_final_link_info *, asection *, 589 struct bfd_link_order *); 590 591 592 #define coff_get_section_contents_in_window \ 593 _bfd_generic_get_section_contents_in_window 594 595 /* Functions in xcofflink.c. */ 596 597 extern long _bfd_xcoff_get_dynamic_symtab_upper_bound 598 (bfd *); 599 extern long _bfd_xcoff_canonicalize_dynamic_symtab 600 (bfd *, asymbol **); 601 extern long _bfd_xcoff_get_dynamic_reloc_upper_bound 602 (bfd *); 603 extern long _bfd_xcoff_canonicalize_dynamic_reloc 604 (bfd *, arelent **, asymbol **); 605 extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create 606 (bfd *); 607 extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols 608 (bfd *, struct bfd_link_info *); 609 extern bfd_boolean _bfd_xcoff_bfd_final_link 610 (bfd *, struct bfd_link_info *); 611 extern bfd_boolean _bfd_xcoff_define_common_symbol 612 (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *); 613 extern bfd_boolean _bfd_ppc_xcoff_relocate_section 614 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 615 struct internal_reloc *, struct internal_syment *, asection **); 616 617 /* Functions in coff-ppc.c. FIXME: These are called by pe.em in the 618 linker, and so should start with bfd and be declared in bfd.h. */ 619 620 extern bfd_boolean ppc_allocate_toc_section 621 (struct bfd_link_info *); 622 extern bfd_boolean ppc_process_before_allocation 623 (bfd *, struct bfd_link_info *); 624
