1/* BFD COFF object file private structure. 2 Copyright (C) 1990-2017 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#include "coff-bfd.h" 24 25#ifdef __cplusplus 26extern "C" { 27#endif 28 29/* Object file tdata; access macros. */ 30 31#define coff_data(bfd) ((bfd)->tdata.coff_obj_data) 32#define obj_pe(bfd) (coff_data (bfd)->pe) 33#define obj_symbols(bfd) (coff_data (bfd)->symbols) 34#define obj_sym_filepos(bfd) (coff_data (bfd)->sym_filepos) 35#define obj_relocbase(bfd) (coff_data (bfd)->relocbase) 36#define obj_raw_syments(bfd) (coff_data (bfd)->raw_syments) 37#define obj_raw_syment_count(bfd) (coff_data (bfd)->raw_syment_count) 38#define obj_convert(bfd) (coff_data (bfd)->conversion_table) 39#define obj_conv_table_size(bfd) (coff_data (bfd)->conv_table_size) 40#define obj_coff_external_syms(bfd) (coff_data (bfd)->external_syms) 41#define obj_coff_keep_syms(bfd) (coff_data (bfd)->keep_syms) 42#define obj_coff_strings(bfd) (coff_data (bfd)->strings) 43#define obj_coff_strings_len(bfd) (coff_data (bfd)->strings_len) 44#define obj_coff_keep_strings(bfd) (coff_data (bfd)->keep_strings) 45#define obj_coff_sym_hashes(bfd) (coff_data (bfd)->sym_hashes) 46#define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written) 47#define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map) 48 49/* `Tdata' information kept for COFF files. */ 50 51typedef struct coff_tdata 52{ 53 struct coff_symbol_struct *symbols; /* Symtab for input bfd. */ 54 unsigned int *conversion_table; 55 int conv_table_size; 56 file_ptr sym_filepos; 57 58 struct coff_ptr_struct *raw_syments; 59 unsigned long raw_syment_count; 60 61 /* These are only valid once writing has begun. */ 62 unsigned long int relocbase; 63 64 /* These members communicate important constants about the symbol table 65 to GDB's symbol-reading code. These `constants' unfortunately vary 66 from coff implementation to implementation... */ 67 unsigned local_n_btmask; 68 unsigned local_n_btshft; 69 unsigned local_n_tmask; 70 unsigned local_n_tshift; 71 unsigned local_symesz; 72 unsigned local_auxesz; 73 unsigned local_linesz; 74 75 /* The unswapped external symbols. May be NULL. Read by 76 _bfd_coff_get_external_symbols. */ 77 void * external_syms; 78 /* If this is TRUE, the external_syms may not be freed. */ 79 bfd_boolean keep_syms; 80 81 /* The string table. May be NULL. Read by 82 _bfd_coff_read_string_table. */ 83 char *strings; 84 /* The length of the strings table. For error checking. */ 85 bfd_size_type strings_len; 86 /* If this is TRUE, the strings may not be freed. */ 87 bfd_boolean keep_strings; 88 /* If this is TRUE, the strings have been written out already. */ 89 bfd_boolean strings_written; 90 91 /* Is this a PE format coff file? */ 92 int pe; 93 /* Used by the COFF backend linker. */ 94 struct coff_link_hash_entry **sym_hashes; 95 96 /* Used by the pe linker for PowerPC. */ 97 int *local_toc_sym_map; 98 99 struct bfd_link_info *link_info; 100 101 /* Used by coff_find_nearest_line. */ 102 void * line_info; 103 104 /* A place to stash dwarf2 info for this bfd. */ 105 void * dwarf2_find_line_info; 106 107 /* The timestamp from the COFF file header. */ 108 long timestamp; 109 110 /* Copy of some of the f_flags bits in the COFF filehdr structure, 111 used by ARM code. */ 112 flagword flags; 113 114 /* coff-stgo32 EXE stub header after BFD tdata has been allocated. Its data 115 is kept in internal_filehdr.go32stub beforehand. */ 116 char *go32stub; 117} coff_data_type; 118 119/* Tdata for pe image files. */ 120typedef struct pe_tdata 121{ 122 coff_data_type coff; 123 struct internal_extra_pe_aouthdr pe_opthdr; 124 int dll; 125 int has_reloc_section; 126 int dont_strip_reloc; 127 bfd_boolean insert_timestamp; 128 bfd_boolean (*in_reloc_p) (bfd *, reloc_howto_type *); 129 flagword real_flags; 130 131 /* Build-id info. */ 132 struct 133 { 134 bfd_boolean (*after_write_object_contents) (bfd *); 135 const char *style; 136 asection *sec; 137 } build_id; 138} pe_data_type; 139 140#define pe_data(bfd) ((bfd)->tdata.pe_obj_data) 141 142/* Tdata for XCOFF files. */ 143 144struct xcoff_tdata 145{ 146 /* Basic COFF information. */ 147 coff_data_type coff; 148 149 /* TRUE if this is an XCOFF64 file. */ 150 bfd_boolean xcoff64; 151 152 /* TRUE if a large a.out header should be generated. */ 153 bfd_boolean full_aouthdr; 154 155 /* TOC value. */ 156 bfd_vma toc; 157 158 /* Index of section holding TOC. */ 159 int sntoc; 160 161 /* Index of section holding entry point. */ 162 int snentry; 163 164 /* .text alignment from optional header. */ 165 int text_align_power; 166 167 /* .data alignment from optional header. */ 168 int data_align_power; 169 170 /* modtype from optional header. */ 171 short modtype; 172 173 /* cputype from optional header. */ 174 short cputype; 175 176 /* maxdata from optional header. */ 177 bfd_vma maxdata; 178 179 /* maxstack from optional header. */ 180 bfd_vma maxstack; 181 182 /* Used by the XCOFF backend linker. */ 183 asection **csects; 184 long *debug_indices; 185 unsigned int *lineno_counts; 186 unsigned int import_file_id; 187}; 188 189#define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data) 190 191/* We take the address of the first element of an asymbol to ensure that the 192 macro is only ever applied to an asymbol. */ 193#define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd))) 194 195/* Tdata for sections in XCOFF files. This is used by the linker. */ 196 197struct xcoff_section_tdata 198{ 199 /* Used for XCOFF csects created by the linker; points to the real 200 XCOFF section which contains this csect. */ 201 asection *enclosing; 202 /* The lineno_count field for the enclosing section, because we are 203 going to clobber it there. */ 204 unsigned int lineno_count; 205 /* The first and last symbol indices for symbols used by this csect. */ 206 unsigned long first_symndx; 207 unsigned long last_symndx; 208}; 209 210/* An accessor macro the xcoff_section_tdata structure. */ 211#define xcoff_section_data(abfd, sec) \ 212 ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata) 213 214/* Tdata for sections in PE files. */ 215 216struct pei_section_tdata 217{ 218 /* The virtual size of the section. */ 219 bfd_size_type virt_size; 220 /* The PE section flags. */ 221 long pe_flags; 222}; 223 224/* An accessor macro for the pei_section_tdata structure. */ 225#define pei_section_data(abfd, sec) \ 226 ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata) 227 228/* COFF linker hash table entries. */ 229 230struct coff_link_hash_entry 231{ 232 struct bfd_link_hash_entry root; 233 234 /* Symbol index in output file. Set to -1 initially. Set to -2 if 235 there is a reloc against this symbol. */ 236 long indx; 237 238 /* Symbol type. */ 239 unsigned short type; 240 241 /* Symbol class. */ 242 unsigned char symbol_class; 243 244 /* Number of auxiliary entries. */ 245 char numaux; 246 247 /* BFD to take auxiliary entries from. */ 248 bfd *auxbfd; 249 250 /* Pointer to array of auxiliary entries, if any. */ 251 union internal_auxent *aux; 252 253 /* Flag word; legal values follow. */ 254 unsigned short coff_link_hash_flags; 255 /* Symbol is a PE section symbol. */ 256#define COFF_LINK_HASH_PE_SECTION_SYMBOL (01) 257}; 258 259/* COFF linker hash table. */ 260 261struct coff_link_hash_table 262{ 263 struct bfd_link_hash_table root; 264 /* A pointer to information used to link stabs in sections. */ 265 struct stab_info stab_info; 266}; 267 268struct coff_reloc_cookie 269{ 270 struct internal_reloc * rels; 271 struct internal_reloc * rel; 272 struct internal_reloc * relend; 273 struct coff_symbol_struct * symbols; /* Symtab for input bfd. */ 274 bfd * abfd; 275 struct coff_link_hash_entry ** sym_hashes; 276}; 277 278/* Look up an entry in a COFF linker hash table. */ 279 280#define coff_link_hash_lookup(table, string, create, copy, follow) \ 281 ((struct coff_link_hash_entry *) \ 282 bfd_link_hash_lookup (&(table)->root, (string), (create), \ 283 (copy), (follow))) 284 285/* Traverse a COFF linker hash table. */ 286 287#define coff_link_hash_traverse(table, func, info) \ 288 (bfd_link_hash_traverse \ 289 (&(table)->root, \ 290 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \ 291 (info))) 292 293/* Get the COFF linker hash table from a link_info structure. */ 294 295#define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash)) 296 297/* Functions in coffgen.c. */ 298extern const bfd_target *coff_object_p 299 (bfd *); 300extern struct bfd_section *coff_section_from_bfd_index 301 (bfd *, int); 302extern long coff_get_symtab_upper_bound 303 (bfd *); 304extern long coff_canonicalize_symtab 305 (bfd *, asymbol **); 306extern int coff_count_linenumbers 307 (bfd *); 308extern bfd_boolean coff_renumber_symbols 309 (bfd *, int *); 310extern void coff_mangle_symbols 311 (bfd *); 312extern bfd_boolean coff_write_symbols 313 (bfd *); 314extern bfd_boolean coff_write_alien_symbol 315 (bfd *, asymbol *, struct internal_syment *, union internal_auxent *, 316 bfd_vma *, bfd_size_type *, asection **, bfd_size_type *); 317extern bfd_boolean coff_write_linenumbers 318 (bfd *); 319extern alent *coff_get_lineno 320 (bfd *, asymbol *); 321extern asymbol *coff_section_symbol 322 (bfd *, char *); 323extern bfd_boolean _bfd_coff_get_external_symbols 324 (bfd *); 325extern const char *_bfd_coff_read_string_table 326 (bfd *); 327extern bfd_boolean _bfd_coff_free_symbols 328 (bfd *); 329extern struct coff_ptr_struct *coff_get_normalized_symtab 330 (bfd *); 331extern long coff_get_reloc_upper_bound 332 (bfd *, sec_ptr); 333extern asymbol *coff_make_empty_symbol 334 (bfd *); 335extern void coff_print_symbol 336 (bfd *, void * filep, asymbol *, bfd_print_symbol_type); 337extern void coff_get_symbol_info 338 (bfd *, asymbol *, symbol_info *ret); 339#define coff_get_symbol_version_string \ 340 _bfd_nosymbols_get_symbol_version_string 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 *, asymbol **, asection *, bfd_vma, 347 const char **, const char **, unsigned int *, unsigned int *); 348#define coff_find_line _bfd_nosymbols_find_line 349struct dwarf_debug_section; 350extern bfd_boolean coff_find_nearest_line_with_names 351 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **, 352 unsigned int *, const struct dwarf_debug_section *); 353extern bfd_boolean coff_find_inliner_info 354 (bfd *, const char **, const char **, unsigned int *); 355extern int coff_sizeof_headers 356 (bfd *, struct bfd_link_info *); 357extern bfd_boolean bfd_coff_reloc16_relax_section 358 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); 359extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents 360 (bfd *, struct bfd_link_info *, struct bfd_link_order *, 361 bfd_byte *, bfd_boolean, asymbol **); 362extern bfd_vma bfd_coff_reloc16_get_value 363 (arelent *, struct bfd_link_info *, asection *); 364extern void bfd_perform_slip 365 (bfd *, unsigned int, asection *, bfd_vma); 366 367/* Functions and types in cofflink.c. */ 368 369#define STRING_SIZE_SIZE 4 370 371/* We use a hash table to merge identical enum, struct, and union 372 definitions in the linker. */ 373 374/* Information we keep for a single element (an enum value, a 375 structure or union field) in the debug merge hash table. */ 376 377struct coff_debug_merge_element 378{ 379 /* Next element. */ 380 struct coff_debug_merge_element *next; 381 382 /* Name. */ 383 const char *name; 384 385 /* Type. */ 386 unsigned int type; 387 388 /* Symbol index for complex type. */ 389 long tagndx; 390}; 391 392/* A linked list of debug merge entries for a given name. */ 393 394struct coff_debug_merge_type 395{ 396 /* Next type with the same name. */ 397 struct coff_debug_merge_type *next; 398 399 /* Class of type. */ 400 int type_class; 401 402 /* Symbol index where this type is defined. */ 403 long indx; 404 405 /* List of elements. */ 406 struct coff_debug_merge_element *elements; 407}; 408 409/* Information we store in the debug merge hash table. */ 410 411struct coff_debug_merge_hash_entry 412{ 413 struct bfd_hash_entry root; 414 415 /* A list of types with this name. */ 416 struct coff_debug_merge_type *types; 417}; 418 419/* The debug merge hash table. */ 420 421struct coff_debug_merge_hash_table 422{ 423 struct bfd_hash_table root; 424}; 425 426/* Initialize a COFF debug merge hash table. */ 427 428#define coff_debug_merge_hash_table_init(table) \ 429 (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \ 430 sizeof (struct coff_debug_merge_hash_entry))) 431 432/* Free a COFF debug merge hash table. */ 433 434#define coff_debug_merge_hash_table_free(table) \ 435 (bfd_hash_table_free (&(table)->root)) 436 437/* Look up an entry in a COFF debug merge hash table. */ 438 439#define coff_debug_merge_hash_lookup(table, string, create, copy) \ 440 ((struct coff_debug_merge_hash_entry *) \ 441 bfd_hash_lookup (&(table)->root, (string), (create), (copy))) 442 443/* Information we keep for each section in the output file when doing 444 a relocatable link. */ 445 446struct coff_link_section_info 447{ 448 /* The relocs to be output. */ 449 struct internal_reloc *relocs; 450 /* For each reloc against a global symbol whose index was not known 451 when the reloc was handled, the global hash table entry. */ 452 struct coff_link_hash_entry **rel_hashes; 453}; 454 455/* Information that we pass around while doing the final link step. */ 456 457struct coff_final_link_info 458{ 459 /* General link information. */ 460 struct bfd_link_info *info; 461 /* Output BFD. */ 462 bfd *output_bfd; 463 /* Used to indicate failure in traversal routine. */ 464 bfd_boolean failed; 465 /* If doing "task linking" set only during the time when we want the 466 global symbol writer to convert the storage class of defined global 467 symbols from global to static. */ 468 bfd_boolean global_to_static; 469 /* Hash table for long symbol names. */ 470 struct bfd_strtab_hash *strtab; 471 /* When doing a relocatable link, an array of information kept for 472 each output section, indexed by the target_index field. */ 473 struct coff_link_section_info *section_info; 474 /* Symbol index of last C_FILE symbol (-1 if none). */ 475 long last_file_index; 476 /* Contents of last C_FILE symbol. */ 477 struct internal_syment last_file; 478 /* Symbol index of first aux entry of last .bf symbol with an empty 479 endndx field (-1 if none). */ 480 long last_bf_index; 481 /* Contents of last_bf_index aux entry. */ 482 union internal_auxent last_bf; 483 /* Hash table used to merge debug information. */ 484 struct coff_debug_merge_hash_table debug_merge; 485 /* Buffer large enough to hold swapped symbols of any input file. */ 486 struct internal_syment *internal_syms; 487 /* Buffer large enough to hold sections of symbols of any input file. */ 488 asection **sec_ptrs; 489 /* Buffer large enough to hold output indices of symbols of any 490 input file. */ 491 long *sym_indices; 492 /* Buffer large enough to hold output symbols for any input file. */ 493 bfd_byte *outsyms; 494 /* Buffer large enough to hold external line numbers for any input 495 section. */ 496 bfd_byte *linenos; 497 /* Buffer large enough to hold any input section. */ 498 bfd_byte *contents; 499 /* Buffer large enough to hold external relocs of any input section. */ 500 bfd_byte *external_relocs; 501 /* Buffer large enough to hold swapped relocs of any input section. */ 502 struct internal_reloc *internal_relocs; 503}; 504 505/* Most COFF variants have no way to record the alignment of a 506 section. This struct is used to set a specific alignment based on 507 the name of the section. */ 508 509struct coff_section_alignment_entry 510{ 511 /* The section name. */ 512 const char *name; 513 514 /* This is either (unsigned int) -1, indicating that the section 515 name must match exactly, or it is the number of letters which 516 must match at the start of the name. */ 517 unsigned int comparison_length; 518 519 /* These macros may be used to fill in the first two fields in a 520 structure initialization. */ 521#define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1) 522#define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1) 523 524 /* Only use this entry if the default section alignment for this 525 target is at least that much (as a power of two). If this field 526 is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ 527 unsigned int default_alignment_min; 528 529 /* Only use this entry if the default section alignment for this 530 target is no greater than this (as a power of two). If this 531 field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */ 532 unsigned int default_alignment_max; 533 534#define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1) 535 536 /* The desired alignment for this section (as a power of two). */ 537 unsigned int alignment_power; 538}; 539 540extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc 541 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 542extern bfd_boolean _bfd_coff_link_hash_table_init 543 (struct coff_link_hash_table *, bfd *, 544 struct bfd_hash_entry *(*) (struct bfd_hash_entry *, 545 struct bfd_hash_table *, 546 const char *), 547 unsigned int); 548extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create 549 (bfd *); 550extern const char *_bfd_coff_internal_syment_name 551 (bfd *, const struct internal_syment *, char *); 552extern bfd_boolean _bfd_coff_section_already_linked 553 (bfd *, asection *, struct bfd_link_info *); 554extern bfd_boolean _bfd_coff_link_add_symbols 555 (bfd *, struct bfd_link_info *); 556extern bfd_boolean _bfd_coff_final_link 557 (bfd *, struct bfd_link_info *); 558extern struct internal_reloc *_bfd_coff_read_internal_relocs 559 (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean, 560 struct internal_reloc *); 561extern bfd_boolean _bfd_coff_generic_relocate_section 562 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 563 struct internal_reloc *, struct internal_syment *, asection **); 564extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc 565 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); 566extern bfd_boolean _bfd_coff_write_global_sym 567 (struct bfd_hash_entry *, void *); 568extern bfd_boolean _bfd_coff_write_task_globals 569 (struct coff_link_hash_entry *, void *); 570extern bfd_boolean _bfd_coff_link_input_bfd 571 (struct coff_final_link_info *, bfd *); 572extern bfd_boolean _bfd_coff_reloc_link_order 573 (bfd *, struct coff_final_link_info *, asection *, 574 struct bfd_link_order *); 575extern bfd_boolean bfd_coff_gc_sections 576 (bfd *, struct bfd_link_info *); 577 578 579#define coff_get_section_contents_in_window \ 580 _bfd_generic_get_section_contents_in_window 581 582/* Functions in xcofflink.c. */ 583 584extern long _bfd_xcoff_get_dynamic_symtab_upper_bound 585 (bfd *); 586extern long _bfd_xcoff_canonicalize_dynamic_symtab 587 (bfd *, asymbol **); 588extern long _bfd_xcoff_get_dynamic_reloc_upper_bound 589 (bfd *); 590extern long _bfd_xcoff_canonicalize_dynamic_reloc 591 (bfd *, arelent **, asymbol **); 592extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create 593 (bfd *); 594extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols 595 (bfd *, struct bfd_link_info *); 596extern bfd_boolean _bfd_xcoff_bfd_final_link 597 (bfd *, struct bfd_link_info *); 598extern bfd_boolean _bfd_xcoff_define_common_symbol 599 (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *); 600extern bfd_boolean _bfd_ppc_xcoff_relocate_section 601 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, 602 struct internal_reloc *, struct internal_syment *, asection **); 603 604/* Functions in coff-ppc.c. FIXME: These are called by pe.em in the 605 linker, and so should start with bfd and be declared in bfd.h. */ 606 607extern bfd_boolean ppc_allocate_toc_section 608 (struct bfd_link_info *); 609extern bfd_boolean ppc_process_before_allocation 610 (bfd *, struct bfd_link_info *); 611