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