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