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 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_data_type; 110 111/* Tdata for pe image files. */ 112typedef 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 bfd_boolean (*in_reloc_p) (bfd *, reloc_howto_type *); 119 flagword real_flags; 120 int target_subsystem; 121 bfd_boolean force_minimum_alignment; 122} pe_data_type; 123 124#define pe_data(bfd) ((bfd)->tdata.pe_obj_data) 125 126/* Tdata for XCOFF files. */ 127 128struct 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 unsigned long *debug_indices; 169 unsigned int import_file_id; 170}; 171 172#define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data) 173 174/* We take the address of the first element of an asymbol to ensure that the 175 macro is only ever applied to an asymbol. */ 176#define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd))) 177 178/* The used_by_bfd field of a section may be set to a pointer to this 179 structure. */ 180 181struct coff_section_tdata 182{ 183 /* The relocs, swapped into COFF internal form. This may be NULL. */ 184 struct internal_reloc *relocs; 185 /* If this is TRUE, the relocs entry may not be freed. */ 186 bfd_boolean keep_relocs; 187 /* The section contents. This may be NULL. */ 188 bfd_byte *contents; 189 /* If this is TRUE, the contents entry may not be freed. */ 190 bfd_boolean keep_contents; 191 /* Information cached by coff_find_nearest_line. */ 192 bfd_vma offset; 193 unsigned int i; 194 const char *function; 195 /* Optional information about a COMDAT entry; NULL if not COMDAT. */ 196 struct coff_comdat_info *comdat; 197 int line_base; 198 /* A pointer used for .stab linking optimizations. */ 199 void * stab_info; 200 /* Available for individual backends. */ 201 void * tdata; 202}; 203 204/* An accessor macro for the coff_section_tdata structure. */ 205#define coff_section_data(abfd, sec) \ 206 ((struct coff_section_tdata *) (sec)->used_by_bfd) 207 208/* Tdata for sections in XCOFF files. This is used by the linker. */ 209 210struct xcoff_section_tdata 211{ 212 /* Used for XCOFF csects created by the linker; points to the real 213 XCOFF section which contains this csect. */ 214 asection *enclosing; 215 /* The lineno_count field for the enclosing section, because we are 216 going to clobber it there. */ 217 unsigned int lineno_count; 218 /* The first and one past the last symbol indices for symbols used 219 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 230struct 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 244struct 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 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 275struct 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. */ 302extern const bfd_target *coff_object_p 303 (bfd *); 304extern struct bfd_section *coff_section_from_bfd_index 305 (bfd *, int); 306extern long coff_get_symtab_upper_bound 307 (bfd *); 308extern long coff_canonicalize_symtab 309 (bfd *, asymbol **); 310extern int coff_count_linenumbers 311 (bfd *); 312extern struct coff_symbol_struct *coff_symbol_from 313 (bfd *, asymbol *); 314extern bfd_boolean coff_renumber_symbols 315 (bfd *, int *); 316extern void coff_mangle_symbols 317 (bfd *); 318extern bfd_boolean coff_write_symbols 319 (bfd *); 320extern bfd_boolean coff_write_linenumbers 321 (bfd *); 322extern alent *coff_get_lineno 323 (bfd *, asymbol *); 324extern asymbol *coff_section_symbol 325 (bfd *, char *); 326extern bfd_boolean _bfd_coff_get_external_symbols 327 (bfd *); 328extern const char *_bfd_coff_read_string_table 329 (bfd *); 330extern bfd_boolean _bfd_coff_free_symbols 331 (bfd *); 332extern struct coff_ptr_struct *coff_get_normalized_symtab 333 (bfd *); 334extern long coff_get_reloc_upper_bound 335 (bfd *, sec_ptr); 336extern asymbol *coff_make_empty_symbol 337 (bfd *); 338extern void coff_print_symbol 339 (bfd *, void * filep, asymbol *, bfd_print_symbol_type); 340extern void coff_get_symbol_info 341 (bfd *, asymbol *, symbol_info *ret); 342extern bfd_boolean _bfd_coff_is_local_label_name 343 (bfd *, const char *); 344extern asymbol *coff_bfd_make_debug_symbol 345 (bfd *, void *, unsigned long); 346extern bfd_boolean coff_find_nearest_line 347 (bfd *, asection *, asymbol **, bfd_vma, const char **, 348 const char **, unsigned int *); 349extern bfd_boolean coff_find_inliner_info 350 (bfd *, const char **, const char **, unsigned int *); 351extern int coff_sizeof_headers 352 (bfd *, struct bfd_link_info *); 353extern bfd_boolean bfd_coff_reloc16_relax_section 354 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); 355extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents 356 (bfd *, struct bfd_link_info *, struct bfd_link_order *, 357 bfd_byte *, bfd_boolean, asymbol **); 358extern bfd_vma bfd_coff_reloc16_get_value 359 (arelent *, struct bfd_link_info *, asection *); 360extern void bfd_perform_slip 361 (bfd *, unsigned int, asection *, bfd_vma); 362 363/* Functions and types in cofflink.c. */ 364 365#define STRING_SIZE_SIZE 4 366 367/* We use a hash table to merge identical enum, struct, and union 368 definitions in the linker. */ 369 370/* Information we keep for a single element (an enum value, a 371 structure or union field) in the debug merge hash table. */ 372 373struct coff_debug_merge_element 374{ 375 /* Next element. */ 376 struct coff_debug_merge_element *next; 377 378 /* Name. */ 379 const char *name; 380 381 /* Type. */ 382 unsigned int type; 383 384 /* Symbol index for complex type. */ 385 long tagndx; 386}; 387 388/* A linked list of debug merge entries for a given name. */ 389 390struct coff_debug_merge_type 391{ 392 /* Next type with the same name. */ 393 struct coff_debug_merge_type *next; 394 395 /* Class of type. */ 396 int class; 397 398 /* Symbol index where this type is defined. */ 399 long indx; 400 401 /* List of elements. */ 402 struct coff_debug_merge_element *elements; 403}; 404 405/* Information we store in the debug merge hash table. */ 406 407struct coff_debug_merge_hash_entry 408{ 409 struct bfd_hash_entry root; 410 411 /* A list of types with this name. */ 412 struct coff_debug_merge_type *types; 413}; 414 415/* The debug merge hash table. */ 416 417struct coff_debug_merge_hash_table 418{ 419 struct bfd_hash_table root; 420}; 421 422/* Initialize a COFF debug merge hash table. */ 423 424#define coff_debug_merge_hash_table_init(table) \ 425 (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \ 426 sizeof (struct coff_debug_merge_hash_entry))) 427 428/* Free a COFF debug merge hash table. */ 429 430#define coff_debug_merge_hash_table_free(table) \ 431 (bfd_hash_table_free (&(table)->root)) 432 433/* Look up an entry in a COFF debug merge hash table. */ 434 435#define coff_debug_merge_hash_lookup(table, string, create, copy) \ 436 ((struct coff_debug_merge_hash_entry *) \ 437 bfd_hash_lookup (&(table)->root, (string), (create), (copy))) 438 439/* Information we keep for each section in the output file when doing 440 a relocatable link. */ 441 442struct coff_link_section_info 443{ 444 /* The relocs to be output. */ 445 struct internal_reloc *relocs; 446 /* For each reloc against a global symbol whose index was not known 447 when the reloc was handled, the global hash table entry. */ 448 struct coff_link_hash_entry **rel_hashes; 449}; 450 451/* Information that we pass around while doing the final link step. */ 452 453struct coff_final_link_info 454{ 455 /* General link information. */ 456 struct bfd_link_info *info; 457 /* Output BFD. */ 458 bfd *output_bfd; 459 /* Used to indicate failure in traversal routine. */ 460 bfd_boolean failed; 461 /* If doing "task linking" set only during the time when we want the 462 global symbol writer to convert the storage class of defined global 463 symbols from global to static. */ 464 bfd_boolean global_to_static; 465 /* Hash table for long symbol names. */ 466 struct bfd_strtab_hash *strtab; 467 /* When doing a relocatable link, an array of information kept for 468 each output section, indexed by the target_index field. */ 469 struct coff_link_section_info *section_info; 470 /* Symbol index of last C_FILE symbol (-1 if none). */ 471 long last_file_index; 472 /* Contents of last C_FILE symbol. */ 473 struct internal_syment last_file; 474 /* Symbol index of first aux entry of last .bf symbol with an empty 475 endndx field (-1 if none). */ 476 long last_bf_index; 477 /* Contents of last_bf_index aux entry. */ 478 union internal_auxent last_bf; 479 /* Hash table used to merge debug information. */ 480 struct coff_debug_merge_hash_table debug_merge; 481 /* Buffer large enough to hold swapped symbols of any input file. */ 482 struct internal_syment *internal_syms; 483 /* Buffer large enough to hold sections of symbols of any input file. */ 484 asection **sec_ptrs; 485 /* Buffer large enough to hold output indices of symbols of any 486 input file. */ 487 long *sym_indices; 488 /* Buffer large enough to hold output symbols for any input file. */ 489 bfd_byte *outsyms; 490 /* Buffer large enough to hold external line numbers for any input 491 section. */ 492 bfd_byte *linenos; 493 /* Buffer large enough to hold any input section. */ 494 bfd_byte *contents; 495 /* Buffer large enough to hold external relocs of any input section. */ 496 bfd_byte *external_relocs; 497 /* Buffer large enough to hold swapped relocs of any input section. */ 498 struct internal_reloc *internal_relocs; 499}; 500 501/* Most COFF variants have no way to record the alignment of a 502 section. This struct is used to set a specific alignment based on 503 the name of the section. */ 504 505struct coff_section_alignment_entry 506{ 507 /* The section name. */ 508 const char *name; 509 510 /* This is either (unsigned int) -1, indicating that the section 511 name must match exactly, or it is the number of letters which 512 must match at the start of the name. */ 513 unsigned int comparison_length; 514 515 /* These macros may be used to fill in the first two fields in a 516 structure initialization. */ 517#define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1) 518#define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1) 519 520 /* Only use this entry if the default section alignment for this 521 target is at least that much (as a power of two). If this field 522 is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ 523 unsigned int default_alignment_min; 524 525 /* Only use this entry if the default section alignment for this 526 target is no greater than this (as a power of two). If this 527 field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ 528 unsigned int default_alignment_max; 529 530#define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1) 531 532 /* The desired alignment for this section (as a power of two). */ 533 unsigned int alignment_power; 534}; 535 536extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc 537 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 538extern bfd_boolean _bfd_coff_link_hash_table_init 539 (struct coff_link_hash_table *, bfd *, 540 struct bfd_hash_entry *(*) (struct bfd_hash_entry *, 541 struct bfd_hash_table *, 542 const char *), 543 unsigned int); 544extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create 545 (bfd *); 546extern const char *_bfd_coff_internal_syment_name 547 (bfd *, const struct internal_syment *, char *); 548extern bfd_boolean _bfd_coff_link_add_symbols 549 (bfd *, struct bfd_link_info *); 550extern bfd_boolean _bfd_coff_final_link 551 (bfd *, struct bfd_link_info *); 552extern struct internal_reloc *_bfd_coff_read_internal_relocs 553 (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean, 554 struct internal_reloc *); 555extern bfd_boolean _bfd_coff_generic_relocate_section 556 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 557 struct internal_reloc *, struct internal_syment *, asection **); 558extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc 559 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 560extern bfd_boolean _bfd_coff_write_global_sym 561 (struct coff_link_hash_entry *, void *); 562extern bfd_boolean _bfd_coff_write_task_globals 563 (struct coff_link_hash_entry *, void *); 564extern bfd_boolean _bfd_coff_link_input_bfd 565 (struct coff_final_link_info *, bfd *); 566extern bfd_boolean _bfd_coff_reloc_link_order 567 (bfd *, struct coff_final_link_info *, asection *, 568 struct bfd_link_order *); 569 570 571#define coff_get_section_contents_in_window \ 572 _bfd_generic_get_section_contents_in_window 573 574/* Functions in xcofflink.c. */ 575 576extern long _bfd_xcoff_get_dynamic_symtab_upper_bound 577 (bfd *); 578extern long _bfd_xcoff_canonicalize_dynamic_symtab 579 (bfd *, asymbol **); 580extern long _bfd_xcoff_get_dynamic_reloc_upper_bound 581 (bfd *); 582extern long _bfd_xcoff_canonicalize_dynamic_reloc 583 (bfd *, arelent **, asymbol **); 584extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create 585 (bfd *); 586extern void _bfd_xcoff_bfd_link_hash_table_free 587 (struct bfd_link_hash_table *); 588extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols 589 (bfd *, struct bfd_link_info *); 590extern bfd_boolean _bfd_xcoff_bfd_final_link 591 (bfd *, struct bfd_link_info *); 592extern bfd_boolean _bfd_ppc_xcoff_relocate_section 593 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 594 struct internal_reloc *, struct internal_syment *, asection **); 595 596/* Functions in coff-ppc.c. FIXME: These are called be pe.em in the 597 linker, and so should start with bfd and be declared in bfd.h. */ 598 599extern bfd_boolean ppc_allocate_toc_section 600 (struct bfd_link_info *); 601extern bfd_boolean ppc_process_before_allocation 602 (bfd *, struct bfd_link_info *); 603 604