1/* BFD COFF object file private structure. 2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 3 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 4 Free Software Foundation, Inc. 5 Written by Cygnus Support. 6 7 This file is part of BFD, the Binary File Descriptor library. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 22 MA 02110-1301, USA. */ 23 24#include "bfdlink.h" 25 26/* Object file tdata; access macros. */ 27 28#define coff_data(bfd) ((bfd)->tdata.coff_obj_data) 29#define exec_hdr(bfd) (coff_data (bfd)->hdr) 30#define obj_pe(bfd) (coff_data (bfd)->pe) 31#define obj_symbols(bfd) (coff_data (bfd)->symbols) 32#define obj_sym_filepos(bfd) (coff_data (bfd)->sym_filepos) 33#define obj_relocbase(bfd) (coff_data (bfd)->relocbase) 34#define obj_raw_syments(bfd) (coff_data (bfd)->raw_syments) 35#define obj_raw_syment_count(bfd) (coff_data (bfd)->raw_syment_count) 36#define obj_convert(bfd) (coff_data (bfd)->conversion_table) 37#define obj_conv_table_size(bfd) (coff_data (bfd)->conv_table_size) 38#define obj_coff_external_syms(bfd) (coff_data (bfd)->external_syms) 39#define obj_coff_keep_syms(bfd) (coff_data (bfd)->keep_syms) 40#define obj_coff_strings(bfd) (coff_data (bfd)->strings) 41#define obj_coff_keep_strings(bfd) (coff_data (bfd)->keep_strings) 42#define obj_coff_sym_hashes(bfd) (coff_data (bfd)->sym_hashes) 43#define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written) 44#define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map) 45 46/* `Tdata' information kept for COFF files. */ 47 48typedef struct coff_tdata 49{ 50 struct coff_symbol_struct *symbols; /* Symtab for input bfd. */ 51 unsigned int *conversion_table; 52 int conv_table_size; 53 file_ptr sym_filepos; 54 55 struct coff_ptr_struct *raw_syments; 56 unsigned long raw_syment_count; 57 58 /* These are only valid once writing has begun. */ 59 long int relocbase; 60 61 /* These members communicate important constants about the symbol table 62 to GDB's symbol-reading code. These `constants' unfortunately vary 63 from coff implementation to implementation... */ 64 unsigned local_n_btmask; 65 unsigned local_n_btshft; 66 unsigned local_n_tmask; 67 unsigned local_n_tshift; 68 unsigned local_symesz; 69 unsigned local_auxesz; 70 unsigned local_linesz; 71 72 /* The unswapped external symbols. May be NULL. Read by 73 _bfd_coff_get_external_symbols. */ 74 void * external_syms; 75 /* If this is TRUE, the external_syms may not be freed. */ 76 bfd_boolean keep_syms; 77 78 /* The string table. May be NULL. Read by 79 _bfd_coff_read_string_table. */ 80 char *strings; 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. */ 115typedef 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 (*in_reloc_p) (bfd *, reloc_howto_type *); 123 flagword real_flags; 124} pe_data_type; 125 126#define pe_data(bfd) ((bfd)->tdata.pe_obj_data) 127 128/* Tdata for XCOFF files. */ 129 130struct xcoff_tdata 131{ 132 /* Basic COFF information. */ 133 coff_data_type coff; 134 135 /* TRUE if this is an XCOFF64 file. */ 136 bfd_boolean xcoff64; 137 138 /* TRUE if a large a.out header should be generated. */ 139 bfd_boolean full_aouthdr; 140 141 /* TOC value. */ 142 bfd_vma toc; 143 144 /* Index of section holding TOC. */ 145 int sntoc; 146 147 /* Index of section holding entry point. */ 148 int snentry; 149 150 /* .text alignment from optional header. */ 151 int text_align_power; 152 153 /* .data alignment from optional header. */ 154 int data_align_power; 155 156 /* modtype from optional header. */ 157 short modtype; 158 159 /* cputype from optional header. */ 160 short cputype; 161 162 /* maxdata from optional header. */ 163 bfd_vma maxdata; 164 165 /* maxstack from optional header. */ 166 bfd_vma maxstack; 167 168 /* Used by the XCOFF backend linker. */ 169 asection **csects; 170 long *debug_indices; 171 unsigned int *lineno_counts; 172 unsigned int import_file_id; 173}; 174 175#define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data) 176 177/* We take the address of the first element of an asymbol to ensure that the 178 macro is only ever applied to an asymbol. */ 179#define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd))) 180 181/* The used_by_bfd field of a section may be set to a pointer to this 182 structure. */ 183 184struct coff_section_tdata 185{ 186 /* The relocs, swapped into COFF internal form. This may be NULL. */ 187 struct internal_reloc *relocs; 188 /* If this is TRUE, the relocs entry may not be freed. */ 189 bfd_boolean keep_relocs; 190 /* The section contents. This may be NULL. */ 191 bfd_byte *contents; 192 /* If this is TRUE, the contents entry may not be freed. */ 193 bfd_boolean keep_contents; 194 /* Information cached by coff_find_nearest_line. */ 195 bfd_vma offset; 196 unsigned int i; 197 const char *function; 198 /* Optional information about a COMDAT entry; NULL if not COMDAT. */ 199 struct coff_comdat_info *comdat; 200 int line_base; 201 /* A pointer used for .stab linking optimizations. */ 202 void * stab_info; 203 /* Available for individual backends. */ 204 void * tdata; 205}; 206 207/* An accessor macro for the coff_section_tdata structure. */ 208#define coff_section_data(abfd, sec) \ 209 ((struct coff_section_tdata *) (sec)->used_by_bfd) 210 211/* Tdata for sections in XCOFF files. This is used by the linker. */ 212 213struct xcoff_section_tdata 214{ 215 /* Used for XCOFF csects created by the linker; points to the real 216 XCOFF section which contains this csect. */ 217 asection *enclosing; 218 /* The lineno_count field for the enclosing section, because we are 219 going to clobber it there. */ 220 unsigned int lineno_count; 221 /* The first and last symbol indices for symbols used by this csect. */ 222 unsigned long first_symndx; 223 unsigned long last_symndx; 224}; 225 226/* An accessor macro the xcoff_section_tdata structure. */ 227#define xcoff_section_data(abfd, sec) \ 228 ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata) 229 230/* Tdata for sections in PE files. */ 231 232struct pei_section_tdata 233{ 234 /* The virtual size of the section. */ 235 bfd_size_type virt_size; 236 /* The PE section flags. */ 237 long pe_flags; 238}; 239 240/* An accessor macro for the pei_section_tdata structure. */ 241#define pei_section_data(abfd, sec) \ 242 ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata) 243 244/* COFF linker hash table entries. */ 245 246struct coff_link_hash_entry 247{ 248 struct bfd_link_hash_entry root; 249 250 /* Symbol index in output file. Set to -1 initially. Set to -2 if 251 there is a reloc against this symbol. */ 252 long indx; 253 254 /* Symbol type. */ 255 unsigned short type; 256 257 /* Symbol class. */ 258 unsigned char symbol_class; 259 260 /* Number of auxiliary entries. */ 261 char numaux; 262 263 /* BFD to take auxiliary entries from. */ 264 bfd *auxbfd; 265 266 /* Pointer to array of auxiliary entries, if any. */ 267 union internal_auxent *aux; 268 269 /* Flag word; legal values follow. */ 270 unsigned short coff_link_hash_flags; 271 /* Symbol is a PE section symbol. */ 272#define COFF_LINK_HASH_PE_SECTION_SYMBOL (01) 273}; 274 275/* COFF linker hash table. */ 276 277struct coff_link_hash_table 278{ 279 struct bfd_link_hash_table root; 280 /* A pointer to information used to link stabs in sections. */ 281 struct stab_info stab_info; 282}; 283 284/* Look up an entry in a COFF linker hash table. */ 285 286#define coff_link_hash_lookup(table, string, create, copy, follow) \ 287 ((struct coff_link_hash_entry *) \ 288 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 289 (copy), (follow))) 290 291/* Traverse a COFF linker hash table. */ 292 293#define coff_link_hash_traverse(table, func, info) \ 294 (bfd_link_hash_traverse \ 295 (&(table)->root, \ 296 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 297 (info))) 298 299/* Get the COFF linker hash table from a link_info structure. */ 300 301#define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash)) 302 303/* Functions in coffgen.c. */ 304extern const bfd_target *coff_object_p 305 (bfd *); 306extern struct bfd_section *coff_section_from_bfd_index 307 (bfd *, int); 308extern long coff_get_symtab_upper_bound 309 (bfd *); 310extern long coff_canonicalize_symtab 311 (bfd *, asymbol **); 312extern int coff_count_linenumbers 313 (bfd *); 314extern struct coff_symbol_struct *coff_symbol_from 315 (bfd *, asymbol *); 316extern bfd_boolean coff_renumber_symbols 317 (bfd *, int *); 318extern void coff_mangle_symbols 319 (bfd *); 320extern bfd_boolean coff_write_symbols 321 (bfd *); 322extern bfd_boolean coff_write_linenumbers 323 (bfd *); 324extern alent *coff_get_lineno 325 (bfd *, asymbol *); 326extern asymbol *coff_section_symbol 327 (bfd *, char *); 328extern bfd_boolean _bfd_coff_get_external_symbols 329 (bfd *); 330extern const char *_bfd_coff_read_string_table 331 (bfd *); 332extern bfd_boolean _bfd_coff_free_symbols 333 (bfd *); 334extern struct coff_ptr_struct *coff_get_normalized_symtab 335 (bfd *); 336extern long coff_get_reloc_upper_bound 337 (bfd *, sec_ptr); 338extern asymbol *coff_make_empty_symbol 339 (bfd *); 340extern void coff_print_symbol 341 (bfd *, void * filep, asymbol *, bfd_print_symbol_type); 342extern void coff_get_symbol_info 343 (bfd *, asymbol *, symbol_info *ret); 344extern bfd_boolean _bfd_coff_is_local_label_name 345 (bfd *, const char *); 346extern asymbol *coff_bfd_make_debug_symbol 347 (bfd *, void *, unsigned long); 348extern bfd_boolean coff_find_nearest_line 349 (bfd *, asection *, asymbol **, bfd_vma, const char **, 350 const char **, unsigned int *); 351extern bfd_boolean coff_find_inliner_info 352 (bfd *, const char **, const char **, unsigned int *); 353extern int coff_sizeof_headers 354 (bfd *, struct bfd_link_info *); 355extern bfd_boolean bfd_coff_reloc16_relax_section 356 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); 357extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents 358 (bfd *, struct bfd_link_info *, struct bfd_link_order *, 359 bfd_byte *, bfd_boolean, asymbol **); 360extern bfd_vma bfd_coff_reloc16_get_value 361 (arelent *, struct bfd_link_info *, asection *); 362extern void bfd_perform_slip 363 (bfd *, unsigned int, asection *, bfd_vma); 364 365/* Functions and types in cofflink.c. */ 366 367#define STRING_SIZE_SIZE 4 368 369/* We use a hash table to merge identical enum, struct, and union 370 definitions in the linker. */ 371 372/* Information we keep for a single element (an enum value, a 373 structure or union field) in the debug merge hash table. */ 374 375struct coff_debug_merge_element 376{ 377 /* Next element. */ 378 struct coff_debug_merge_element *next; 379 380 /* Name. */ 381 const char *name; 382 383 /* Type. */ 384 unsigned int type; 385 386 /* Symbol index for complex type. */ 387 long tagndx; 388}; 389 390/* A linked list of debug merge entries for a given name. */ 391 392struct coff_debug_merge_type 393{ 394 /* Next type with the same name. */ 395 struct coff_debug_merge_type *next; 396 397 /* Class of type. */ 398 int type_class; 399 400 /* Symbol index where this type is defined. */ 401 long indx; 402 403 /* List of elements. */ 404 struct coff_debug_merge_element *elements; 405}; 406 407/* Information we store in the debug merge hash table. */ 408 409struct coff_debug_merge_hash_entry 410{ 411 struct bfd_hash_entry root; 412 413 /* A list of types with this name. */ 414 struct coff_debug_merge_type *types; 415}; 416 417/* The debug merge hash table. */ 418 419struct coff_debug_merge_hash_table 420{ 421 struct bfd_hash_table root; 422}; 423 424/* Initialize a COFF debug merge hash table. */ 425 426#define coff_debug_merge_hash_table_init(table) \ 427 (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \ 428 sizeof (struct coff_debug_merge_hash_entry))) 429 430/* Free a COFF debug merge hash table. */ 431 432#define coff_debug_merge_hash_table_free(table) \ 433 (bfd_hash_table_free (&(table)->root)) 434 435/* Look up an entry in a COFF debug merge hash table. */ 436 437#define coff_debug_merge_hash_lookup(table, string, create, copy) \ 438 ((struct coff_debug_merge_hash_entry *) \ 439 bfd_hash_lookup (&(table)->root, (string), (create), (copy))) 440 441/* Information we keep for each section in the output file when doing 442 a relocatable link. */ 443 444struct coff_link_section_info 445{ 446 /* The relocs to be output. */ 447 struct internal_reloc *relocs; 448 /* For each reloc against a global symbol whose index was not known 449 when the reloc was handled, the global hash table entry. */ 450 struct coff_link_hash_entry **rel_hashes; 451}; 452 453/* Information that we pass around while doing the final link step. */ 454 455struct coff_final_link_info 456{ 457 /* General link information. */ 458 struct bfd_link_info *info; 459 /* Output BFD. */ 460 bfd *output_bfd; 461 /* Used to indicate failure in traversal routine. */ 462 bfd_boolean failed; 463 /* If doing "task linking" set only during the time when we want the 464 global symbol writer to convert the storage class of defined global 465 symbols from global to static. */ 466 bfd_boolean global_to_static; 467 /* Hash table for long symbol names. */ 468 struct bfd_strtab_hash *strtab; 469 /* When doing a relocatable link, an array of information kept for 470 each output section, indexed by the target_index field. */ 471 struct coff_link_section_info *section_info; 472 /* Symbol index of last C_FILE symbol (-1 if none). */ 473 long last_file_index; 474 /* Contents of last C_FILE symbol. */ 475 struct internal_syment last_file; 476 /* Symbol index of first aux entry of last .bf symbol with an empty 477 endndx field (-1 if none). */ 478 long last_bf_index; 479 /* Contents of last_bf_index aux entry. */ 480 union internal_auxent last_bf; 481 /* Hash table used to merge debug information. */ 482 struct coff_debug_merge_hash_table debug_merge; 483 /* Buffer large enough to hold swapped symbols of any input file. */ 484 struct internal_syment *internal_syms; 485 /* Buffer large enough to hold sections of symbols of any input file. */ 486 asection **sec_ptrs; 487 /* Buffer large enough to hold output indices of symbols of any 488 input file. */ 489 long *sym_indices; 490 /* Buffer large enough to hold output symbols for any input file. */ 491 bfd_byte *outsyms; 492 /* Buffer large enough to hold external line numbers for any input 493 section. */ 494 bfd_byte *linenos; 495 /* Buffer large enough to hold any input section. */ 496 bfd_byte *contents; 497 /* Buffer large enough to hold external relocs of any input section. */ 498 bfd_byte *external_relocs; 499 /* Buffer large enough to hold swapped relocs of any input section. */ 500 struct internal_reloc *internal_relocs; 501}; 502 503/* Most COFF variants have no way to record the alignment of a 504 section. This struct is used to set a specific alignment based on 505 the name of the section. */ 506 507struct coff_section_alignment_entry 508{ 509 /* The section name. */ 510 const char *name; 511 512 /* This is either (unsigned int) -1, indicating that the section 513 name must match exactly, or it is the number of letters which 514 must match at the start of the name. */ 515 unsigned int comparison_length; 516 517 /* These macros may be used to fill in the first two fields in a 518 structure initialization. */ 519#define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1) 520#define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1) 521 522 /* Only use this entry if the default section alignment for this 523 target is at least that much (as a power of two). If this field 524 is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ 525 unsigned int default_alignment_min; 526 527 /* Only use this entry if the default section alignment for this 528 target is no greater than this (as a power of two). If this 529 field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ 530 unsigned int default_alignment_max; 531 532#define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1) 533 534 /* The desired alignment for this section (as a power of two). */ 535 unsigned int alignment_power; 536}; 537 538extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc 539 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 540extern bfd_boolean _bfd_coff_link_hash_table_init 541 (struct coff_link_hash_table *, bfd *, 542 struct bfd_hash_entry *(*) (struct bfd_hash_entry *, 543 struct bfd_hash_table *, 544 const char *), 545 unsigned int); 546extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create 547 (bfd *); 548extern const char *_bfd_coff_internal_syment_name 549 (bfd *, const struct internal_syment *, char *); 550extern bfd_boolean _bfd_coff_link_add_symbols 551 (bfd *, struct bfd_link_info *); 552extern bfd_boolean _bfd_coff_final_link 553 (bfd *, struct bfd_link_info *); 554extern struct internal_reloc *_bfd_coff_read_internal_relocs 555 (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean, 556 struct internal_reloc *); 557extern bfd_boolean _bfd_coff_generic_relocate_section 558 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 559 struct internal_reloc *, struct internal_syment *, asection **); 560extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc 561 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 562extern bfd_boolean _bfd_coff_write_global_sym 563 (struct coff_link_hash_entry *, void *); 564extern bfd_boolean _bfd_coff_write_task_globals 565 (struct coff_link_hash_entry *, void *); 566extern bfd_boolean _bfd_coff_link_input_bfd 567 (struct coff_final_link_info *, bfd *); 568extern bfd_boolean _bfd_coff_reloc_link_order 569 (bfd *, struct coff_final_link_info *, asection *, 570 struct bfd_link_order *); 571 572 573#define coff_get_section_contents_in_window \ 574 _bfd_generic_get_section_contents_in_window 575 576/* Functions in xcofflink.c. */ 577 578extern long _bfd_xcoff_get_dynamic_symtab_upper_bound 579 (bfd *); 580extern long _bfd_xcoff_canonicalize_dynamic_symtab 581 (bfd *, asymbol **); 582extern long _bfd_xcoff_get_dynamic_reloc_upper_bound 583 (bfd *); 584extern long _bfd_xcoff_canonicalize_dynamic_reloc 585 (bfd *, arelent **, asymbol **); 586extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create 587 (bfd *); 588extern void _bfd_xcoff_bfd_link_hash_table_free 589 (struct bfd_link_hash_table *); 590extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols 591 (bfd *, struct bfd_link_info *); 592extern bfd_boolean _bfd_xcoff_bfd_final_link 593 (bfd *, struct bfd_link_info *); 594extern bfd_boolean _bfd_xcoff_define_common_symbol 595 (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *); 596extern bfd_boolean _bfd_ppc_xcoff_relocate_section 597 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 598 struct internal_reloc *, struct internal_syment *, asection **); 599 600/* Functions in coff-ppc.c. FIXME: These are called by pe.em in the 601 linker, and so should start with bfd and be declared in bfd.h. */ 602 603extern bfd_boolean ppc_allocate_toc_section 604 (struct bfd_link_info *); 605extern bfd_boolean ppc_process_before_allocation 606 (bfd *, struct bfd_link_info *); 607