targets.texi revision 1.5
1@section Targets 2 3 4@strong{Description}@* 5Each port of BFD to a different machine requires the creation 6of a target back end. All the back end provides to the root 7part of BFD is a structure containing pointers to functions 8which perform certain low level operations on files. BFD 9translates the applications's requests through a pointer into 10calls to the back end routines. 11 12When a file is opened with @code{bfd_openr}, its format and 13target are unknown. BFD uses various mechanisms to determine 14how to interpret the file. The operations performed are: 15 16@itemize @bullet 17 18@item 19Create a BFD by calling the internal routine 20@code{_bfd_new_bfd}, then call @code{bfd_find_target} with the 21target string supplied to @code{bfd_openr} and the new BFD pointer. 22 23@item 24If a null target string was provided to @code{bfd_find_target}, 25look up the environment variable @code{GNUTARGET} and use 26that as the target string. 27 28@item 29If the target string is still @code{NULL}, or the target string is 30@code{default}, then use the first item in the target vector 31as the target type, and set @code{target_defaulted} in the BFD to 32cause @code{bfd_check_format} to loop through all the targets. 33@xref{bfd_target}. @xref{Formats}. 34 35@item 36Otherwise, inspect the elements in the target vector 37one by one, until a match on target name is found. When found, 38use it. 39 40@item 41Otherwise return the error @code{bfd_error_invalid_target} to 42@code{bfd_openr}. 43 44@item 45@code{bfd_openr} attempts to open the file using 46@code{bfd_open_file}, and returns the BFD. 47@end itemize 48Once the BFD has been opened and the target selected, the file 49format may be determined. This is done by calling 50@code{bfd_check_format} on the BFD with a suggested format. 51If @code{target_defaulted} has been set, each possible target 52type is tried to see if it recognizes the specified format. 53@code{bfd_check_format} returns @code{TRUE} when the caller guesses right. 54@menu 55* bfd_target:: 56@end menu 57 58@node bfd_target, , Targets, Targets 59 60@subsection bfd_target 61 62 63@strong{Description}@* 64This structure contains everything that BFD knows about a 65target. It includes things like its byte order, name, and which 66routines to call to do various operations. 67 68Every BFD points to a target structure with its @code{xvec} 69member. 70 71The macros below are used to dispatch to functions through the 72@code{bfd_target} vector. They are used in a number of macros further 73down in @file{bfd.h}, and are also used when calling various 74routines by hand inside the BFD implementation. The @var{arglist} 75argument must be parenthesized; it contains all the arguments 76to the called function. 77 78They make the documentation (more) unpleasant to read, so if 79someone wants to fix this and not break the above, please do. 80@example 81#define BFD_SEND(bfd, message, arglist) \ 82 ((*((bfd)->xvec->message)) arglist) 83 84#ifdef DEBUG_BFD_SEND 85#undef BFD_SEND 86#define BFD_SEND(bfd, message, arglist) \ 87 (((bfd) && (bfd)->xvec && (bfd)->xvec->message) ? \ 88 ((*((bfd)->xvec->message)) arglist) : \ 89 (bfd_assert (__FILE__,__LINE__), NULL)) 90#endif 91@end example 92For operations which index on the BFD format: 93@example 94#define BFD_SEND_FMT(bfd, message, arglist) \ 95 (((bfd)->xvec->message[(int) ((bfd)->format)]) arglist) 96 97#ifdef DEBUG_BFD_SEND 98#undef BFD_SEND_FMT 99#define BFD_SEND_FMT(bfd, message, arglist) \ 100 (((bfd) && (bfd)->xvec && (bfd)->xvec->message) ? \ 101 (((bfd)->xvec->message[(int) ((bfd)->format)]) arglist) : \ 102 (bfd_assert (__FILE__,__LINE__), NULL)) 103#endif 104 105@end example 106This is the structure which defines the type of BFD this is. The 107@code{xvec} member of the struct @code{bfd} itself points here. Each 108module that implements access to a different target under BFD, 109defines one of these. 110 111FIXME, these names should be rationalised with the names of 112the entry points which call them. Too bad we can't have one 113macro to define them both! 114@example 115enum bfd_flavour 116@{ 117 /* N.B. Update bfd_flavour_name if you change this. */ 118 bfd_target_unknown_flavour, 119 bfd_target_aout_flavour, 120 bfd_target_coff_flavour, 121 bfd_target_ecoff_flavour, 122 bfd_target_xcoff_flavour, 123 bfd_target_elf_flavour, 124 bfd_target_ieee_flavour, 125 bfd_target_nlm_flavour, 126 bfd_target_oasys_flavour, 127 bfd_target_tekhex_flavour, 128 bfd_target_srec_flavour, 129 bfd_target_verilog_flavour, 130 bfd_target_ihex_flavour, 131 bfd_target_som_flavour, 132 bfd_target_os9k_flavour, 133 bfd_target_versados_flavour, 134 bfd_target_msdos_flavour, 135 bfd_target_ovax_flavour, 136 bfd_target_evax_flavour, 137 bfd_target_mmo_flavour, 138 bfd_target_mach_o_flavour, 139 bfd_target_pef_flavour, 140 bfd_target_pef_xlib_flavour, 141 bfd_target_sym_flavour 142@}; 143 144enum bfd_endian @{ BFD_ENDIAN_BIG, BFD_ENDIAN_LITTLE, BFD_ENDIAN_UNKNOWN @}; 145 146/* Forward declaration. */ 147typedef struct bfd_link_info _bfd_link_info; 148 149/* Forward declaration. */ 150typedef struct flag_info flag_info; 151 152typedef struct bfd_target 153@{ 154 /* Identifies the kind of target, e.g., SunOS4, Ultrix, etc. */ 155 char *name; 156 157 /* The "flavour" of a back end is a general indication about 158 the contents of a file. */ 159 enum bfd_flavour flavour; 160 161 /* The order of bytes within the data area of a file. */ 162 enum bfd_endian byteorder; 163 164 /* The order of bytes within the header parts of a file. */ 165 enum bfd_endian header_byteorder; 166 167 /* A mask of all the flags which an executable may have set - 168 from the set @code{BFD_NO_FLAGS}, @code{HAS_RELOC}, ...@code{D_PAGED}. */ 169 flagword object_flags; 170 171 /* A mask of all the flags which a section may have set - from 172 the set @code{SEC_NO_FLAGS}, @code{SEC_ALLOC}, ...@code{SET_NEVER_LOAD}. */ 173 flagword section_flags; 174 175 /* The character normally found at the front of a symbol. 176 (if any), perhaps `_'. */ 177 char symbol_leading_char; 178 179 /* The pad character for file names within an archive header. */ 180 char ar_pad_char; 181 182 /* The maximum number of characters in an archive header. */ 183 unsigned char ar_max_namelen; 184 185 /* How well this target matches, used to select between various 186 possible targets when more than one target matches. */ 187 unsigned char match_priority; 188 189 /* Entries for byte swapping for data. These are different from the 190 other entry points, since they don't take a BFD as the first argument. 191 Certain other handlers could do the same. */ 192 bfd_uint64_t (*bfd_getx64) (const void *); 193 bfd_int64_t (*bfd_getx_signed_64) (const void *); 194 void (*bfd_putx64) (bfd_uint64_t, void *); 195 bfd_vma (*bfd_getx32) (const void *); 196 bfd_signed_vma (*bfd_getx_signed_32) (const void *); 197 void (*bfd_putx32) (bfd_vma, void *); 198 bfd_vma (*bfd_getx16) (const void *); 199 bfd_signed_vma (*bfd_getx_signed_16) (const void *); 200 void (*bfd_putx16) (bfd_vma, void *); 201 202 /* Byte swapping for the headers. */ 203 bfd_uint64_t (*bfd_h_getx64) (const void *); 204 bfd_int64_t (*bfd_h_getx_signed_64) (const void *); 205 void (*bfd_h_putx64) (bfd_uint64_t, void *); 206 bfd_vma (*bfd_h_getx32) (const void *); 207 bfd_signed_vma (*bfd_h_getx_signed_32) (const void *); 208 void (*bfd_h_putx32) (bfd_vma, void *); 209 bfd_vma (*bfd_h_getx16) (const void *); 210 bfd_signed_vma (*bfd_h_getx_signed_16) (const void *); 211 void (*bfd_h_putx16) (bfd_vma, void *); 212 213 /* Format dependent routines: these are vectors of entry points 214 within the target vector structure, one for each format to check. */ 215 216 /* Check the format of a file being read. Return a @code{bfd_target *} or zero. */ 217 const struct bfd_target *(*_bfd_check_format[bfd_type_end]) (bfd *); 218 219 /* Set the format of a file being written. */ 220 bfd_boolean (*_bfd_set_format[bfd_type_end]) (bfd *); 221 222 /* Write cached information into a file being written, at @code{bfd_close}. */ 223 bfd_boolean (*_bfd_write_contents[bfd_type_end]) (bfd *); 224 225@end example 226The general target vector. These vectors are initialized using the 227BFD_JUMP_TABLE macros. 228@example 229 230 /* Generic entry points. */ 231#define BFD_JUMP_TABLE_GENERIC(NAME) \ 232 NAME##_close_and_cleanup, \ 233 NAME##_bfd_free_cached_info, \ 234 NAME##_new_section_hook, \ 235 NAME##_get_section_contents, \ 236 NAME##_get_section_contents_in_window 237 238 /* Called when the BFD is being closed to do any necessary cleanup. */ 239 bfd_boolean (*_close_and_cleanup) (bfd *); 240 /* Ask the BFD to free all cached information. */ 241 bfd_boolean (*_bfd_free_cached_info) (bfd *); 242 /* Called when a new section is created. */ 243 bfd_boolean (*_new_section_hook) (bfd *, sec_ptr); 244 /* Read the contents of a section. */ 245 bfd_boolean (*_bfd_get_section_contents) 246 (bfd *, sec_ptr, void *, file_ptr, bfd_size_type); 247 bfd_boolean (*_bfd_get_section_contents_in_window) 248 (bfd *, sec_ptr, bfd_window *, file_ptr, bfd_size_type); 249 250 /* Entry points to copy private data. */ 251#define BFD_JUMP_TABLE_COPY(NAME) \ 252 NAME##_bfd_copy_private_bfd_data, \ 253 NAME##_bfd_merge_private_bfd_data, \ 254 _bfd_generic_init_private_section_data, \ 255 NAME##_bfd_copy_private_section_data, \ 256 NAME##_bfd_copy_private_symbol_data, \ 257 NAME##_bfd_copy_private_header_data, \ 258 NAME##_bfd_set_private_flags, \ 259 NAME##_bfd_print_private_bfd_data 260 261 /* Called to copy BFD general private data from one object file 262 to another. */ 263 bfd_boolean (*_bfd_copy_private_bfd_data) (bfd *, bfd *); 264 /* Called to merge BFD general private data from one object file 265 to a common output file when linking. */ 266 bfd_boolean (*_bfd_merge_private_bfd_data) (bfd *, bfd *); 267 /* Called to initialize BFD private section data from one object file 268 to another. */ 269#define bfd_init_private_section_data(ibfd, isec, obfd, osec, link_info) \ 270 BFD_SEND (obfd, _bfd_init_private_section_data, (ibfd, isec, obfd, osec, link_info)) 271 bfd_boolean (*_bfd_init_private_section_data) 272 (bfd *, sec_ptr, bfd *, sec_ptr, struct bfd_link_info *); 273 /* Called to copy BFD private section data from one object file 274 to another. */ 275 bfd_boolean (*_bfd_copy_private_section_data) 276 (bfd *, sec_ptr, bfd *, sec_ptr); 277 /* Called to copy BFD private symbol data from one symbol 278 to another. */ 279 bfd_boolean (*_bfd_copy_private_symbol_data) 280 (bfd *, asymbol *, bfd *, asymbol *); 281 /* Called to copy BFD private header data from one object file 282 to another. */ 283 bfd_boolean (*_bfd_copy_private_header_data) 284 (bfd *, bfd *); 285 /* Called to set private backend flags. */ 286 bfd_boolean (*_bfd_set_private_flags) (bfd *, flagword); 287 288 /* Called to print private BFD data. */ 289 bfd_boolean (*_bfd_print_private_bfd_data) (bfd *, void *); 290 291 /* Core file entry points. */ 292#define BFD_JUMP_TABLE_CORE(NAME) \ 293 NAME##_core_file_failing_command, \ 294 NAME##_core_file_failing_signal, \ 295 NAME##_core_file_matches_executable_p, \ 296 NAME##_core_file_pid 297 298 char * (*_core_file_failing_command) (bfd *); 299 int (*_core_file_failing_signal) (bfd *); 300 bfd_boolean (*_core_file_matches_executable_p) (bfd *, bfd *); 301 int (*_core_file_pid) (bfd *); 302 303 /* Archive entry points. */ 304#define BFD_JUMP_TABLE_ARCHIVE(NAME) \ 305 NAME##_slurp_armap, \ 306 NAME##_slurp_extended_name_table, \ 307 NAME##_construct_extended_name_table, \ 308 NAME##_truncate_arname, \ 309 NAME##_write_armap, \ 310 NAME##_read_ar_hdr, \ 311 NAME##_write_ar_hdr, \ 312 NAME##_openr_next_archived_file, \ 313 NAME##_get_elt_at_index, \ 314 NAME##_generic_stat_arch_elt, \ 315 NAME##_update_armap_timestamp 316 317 bfd_boolean (*_bfd_slurp_armap) (bfd *); 318 bfd_boolean (*_bfd_slurp_extended_name_table) (bfd *); 319 bfd_boolean (*_bfd_construct_extended_name_table) 320 (bfd *, char **, bfd_size_type *, const char **); 321 void (*_bfd_truncate_arname) (bfd *, const char *, char *); 322 bfd_boolean (*write_armap) 323 (bfd *, unsigned int, struct orl *, unsigned int, int); 324 void * (*_bfd_read_ar_hdr_fn) (bfd *); 325 bfd_boolean (*_bfd_write_ar_hdr_fn) (bfd *, bfd *); 326 bfd * (*openr_next_archived_file) (bfd *, bfd *); 327#define bfd_get_elt_at_index(b,i) BFD_SEND (b, _bfd_get_elt_at_index, (b,i)) 328 bfd * (*_bfd_get_elt_at_index) (bfd *, symindex); 329 int (*_bfd_stat_arch_elt) (bfd *, struct stat *); 330 bfd_boolean (*_bfd_update_armap_timestamp) (bfd *); 331 332 /* Entry points used for symbols. */ 333#define BFD_JUMP_TABLE_SYMBOLS(NAME) \ 334 NAME##_get_symtab_upper_bound, \ 335 NAME##_canonicalize_symtab, \ 336 NAME##_make_empty_symbol, \ 337 NAME##_print_symbol, \ 338 NAME##_get_symbol_info, \ 339 NAME##_get_symbol_version_string, \ 340 NAME##_bfd_is_local_label_name, \ 341 NAME##_bfd_is_target_special_symbol, \ 342 NAME##_get_lineno, \ 343 NAME##_find_nearest_line, \ 344 NAME##_find_line, \ 345 NAME##_find_inliner_info, \ 346 NAME##_bfd_make_debug_symbol, \ 347 NAME##_read_minisymbols, \ 348 NAME##_minisymbol_to_symbol 349 350 long (*_bfd_get_symtab_upper_bound) (bfd *); 351 long (*_bfd_canonicalize_symtab) 352 (bfd *, struct bfd_symbol **); 353 struct bfd_symbol * 354 (*_bfd_make_empty_symbol) (bfd *); 355 void (*_bfd_print_symbol) 356 (bfd *, void *, struct bfd_symbol *, bfd_print_symbol_type); 357#define bfd_print_symbol(b,p,s,e) BFD_SEND (b, _bfd_print_symbol, (b,p,s,e)) 358 void (*_bfd_get_symbol_info) 359 (bfd *, struct bfd_symbol *, symbol_info *); 360#define bfd_get_symbol_info(b,p,e) BFD_SEND (b, _bfd_get_symbol_info, (b,p,e)) 361 const char *(*_bfd_get_symbol_version_string) 362 (bfd *, struct bfd_symbol *, bfd_boolean *); 363#define bfd_get_symbol_version_string(b,s,h) BFD_SEND (b, _bfd_get_symbol_version_string, (b,s,h)) 364 bfd_boolean (*_bfd_is_local_label_name) (bfd *, const char *); 365 bfd_boolean (*_bfd_is_target_special_symbol) (bfd *, asymbol *); 366 alent * (*_get_lineno) (bfd *, struct bfd_symbol *); 367 bfd_boolean (*_bfd_find_nearest_line) 368 (bfd *, struct bfd_symbol **, struct bfd_section *, bfd_vma, 369 const char **, const char **, unsigned int *, unsigned int *); 370 bfd_boolean (*_bfd_find_line) 371 (bfd *, struct bfd_symbol **, struct bfd_symbol *, 372 const char **, unsigned int *); 373 bfd_boolean (*_bfd_find_inliner_info) 374 (bfd *, const char **, const char **, unsigned int *); 375 /* Back-door to allow format-aware applications to create debug symbols 376 while using BFD for everything else. Currently used by the assembler 377 when creating COFF files. */ 378 asymbol * (*_bfd_make_debug_symbol) 379 (bfd *, void *, unsigned long size); 380#define bfd_read_minisymbols(b, d, m, s) \ 381 BFD_SEND (b, _read_minisymbols, (b, d, m, s)) 382 long (*_read_minisymbols) 383 (bfd *, bfd_boolean, void **, unsigned int *); 384#define bfd_minisymbol_to_symbol(b, d, m, f) \ 385 BFD_SEND (b, _minisymbol_to_symbol, (b, d, m, f)) 386 asymbol * (*_minisymbol_to_symbol) 387 (bfd *, bfd_boolean, const void *, asymbol *); 388 389 /* Routines for relocs. */ 390#define BFD_JUMP_TABLE_RELOCS(NAME) \ 391 NAME##_get_reloc_upper_bound, \ 392 NAME##_canonicalize_reloc, \ 393 NAME##_bfd_reloc_type_lookup, \ 394 NAME##_bfd_reloc_name_lookup 395 396 long (*_get_reloc_upper_bound) (bfd *, sec_ptr); 397 long (*_bfd_canonicalize_reloc) 398 (bfd *, sec_ptr, arelent **, struct bfd_symbol **); 399 /* See documentation on reloc types. */ 400 reloc_howto_type * 401 (*reloc_type_lookup) (bfd *, bfd_reloc_code_real_type); 402 reloc_howto_type * 403 (*reloc_name_lookup) (bfd *, const char *); 404 405 406 /* Routines used when writing an object file. */ 407#define BFD_JUMP_TABLE_WRITE(NAME) \ 408 NAME##_set_arch_mach, \ 409 NAME##_set_section_contents 410 411 bfd_boolean (*_bfd_set_arch_mach) 412 (bfd *, enum bfd_architecture, unsigned long); 413 bfd_boolean (*_bfd_set_section_contents) 414 (bfd *, sec_ptr, const void *, file_ptr, bfd_size_type); 415 416 /* Routines used by the linker. */ 417#define BFD_JUMP_TABLE_LINK(NAME) \ 418 NAME##_sizeof_headers, \ 419 NAME##_bfd_get_relocated_section_contents, \ 420 NAME##_bfd_relax_section, \ 421 NAME##_bfd_link_hash_table_create, \ 422 NAME##_bfd_link_add_symbols, \ 423 NAME##_bfd_link_just_syms, \ 424 NAME##_bfd_copy_link_hash_symbol_type, \ 425 NAME##_bfd_final_link, \ 426 NAME##_bfd_link_split_section, \ 427 NAME##_bfd_link_check_relocs, \ 428 NAME##_bfd_gc_sections, \ 429 NAME##_bfd_lookup_section_flags, \ 430 NAME##_bfd_merge_sections, \ 431 NAME##_bfd_is_group_section, \ 432 NAME##_bfd_discard_group, \ 433 NAME##_section_already_linked, \ 434 NAME##_bfd_define_common_symbol 435 436 int (*_bfd_sizeof_headers) (bfd *, struct bfd_link_info *); 437 bfd_byte * (*_bfd_get_relocated_section_contents) 438 (bfd *, struct bfd_link_info *, struct bfd_link_order *, 439 bfd_byte *, bfd_boolean, struct bfd_symbol **); 440 441 bfd_boolean (*_bfd_relax_section) 442 (bfd *, struct bfd_section *, struct bfd_link_info *, bfd_boolean *); 443 444 /* Create a hash table for the linker. Different backends store 445 different information in this table. */ 446 struct bfd_link_hash_table * 447 (*_bfd_link_hash_table_create) (bfd *); 448 449 /* Add symbols from this object file into the hash table. */ 450 bfd_boolean (*_bfd_link_add_symbols) (bfd *, struct bfd_link_info *); 451 452 /* Indicate that we are only retrieving symbol values from this section. */ 453 void (*_bfd_link_just_syms) (asection *, struct bfd_link_info *); 454 455 /* Copy the symbol type and other attributes for a linker script 456 assignment of one symbol to another. */ 457#define bfd_copy_link_hash_symbol_type(b, t, f) \ 458 BFD_SEND (b, _bfd_copy_link_hash_symbol_type, (b, t, f)) 459 void (*_bfd_copy_link_hash_symbol_type) 460 (bfd *, struct bfd_link_hash_entry *, struct bfd_link_hash_entry *); 461 462 /* Do a link based on the link_order structures attached to each 463 section of the BFD. */ 464 bfd_boolean (*_bfd_final_link) (bfd *, struct bfd_link_info *); 465 466 /* Should this section be split up into smaller pieces during linking. */ 467 bfd_boolean (*_bfd_link_split_section) (bfd *, struct bfd_section *); 468 469 /* Check the relocations in the bfd for validity. */ 470 bfd_boolean (* _bfd_link_check_relocs)(bfd *, struct bfd_link_info *); 471 472 /* Remove sections that are not referenced from the output. */ 473 bfd_boolean (*_bfd_gc_sections) (bfd *, struct bfd_link_info *); 474 475 /* Sets the bitmask of allowed and disallowed section flags. */ 476 bfd_boolean (*_bfd_lookup_section_flags) (struct bfd_link_info *, 477 struct flag_info *, 478 asection *); 479 480 /* Attempt to merge SEC_MERGE sections. */ 481 bfd_boolean (*_bfd_merge_sections) (bfd *, struct bfd_link_info *); 482 483 /* Is this section a member of a group? */ 484 bfd_boolean (*_bfd_is_group_section) (bfd *, const struct bfd_section *); 485 486 /* Discard members of a group. */ 487 bfd_boolean (*_bfd_discard_group) (bfd *, struct bfd_section *); 488 489 /* Check if SEC has been already linked during a reloceatable or 490 final link. */ 491 bfd_boolean (*_section_already_linked) (bfd *, asection *, 492 struct bfd_link_info *); 493 494 /* Define a common symbol. */ 495 bfd_boolean (*_bfd_define_common_symbol) (bfd *, struct bfd_link_info *, 496 struct bfd_link_hash_entry *); 497 498 /* Routines to handle dynamic symbols and relocs. */ 499#define BFD_JUMP_TABLE_DYNAMIC(NAME) \ 500 NAME##_get_dynamic_symtab_upper_bound, \ 501 NAME##_canonicalize_dynamic_symtab, \ 502 NAME##_get_synthetic_symtab, \ 503 NAME##_get_dynamic_reloc_upper_bound, \ 504 NAME##_canonicalize_dynamic_reloc 505 506 /* Get the amount of memory required to hold the dynamic symbols. */ 507 long (*_bfd_get_dynamic_symtab_upper_bound) (bfd *); 508 /* Read in the dynamic symbols. */ 509 long (*_bfd_canonicalize_dynamic_symtab) 510 (bfd *, struct bfd_symbol **); 511 /* Create synthetized symbols. */ 512 long (*_bfd_get_synthetic_symtab) 513 (bfd *, long, struct bfd_symbol **, long, struct bfd_symbol **, 514 struct bfd_symbol **); 515 /* Get the amount of memory required to hold the dynamic relocs. */ 516 long (*_bfd_get_dynamic_reloc_upper_bound) (bfd *); 517 /* Read in the dynamic relocs. */ 518 long (*_bfd_canonicalize_dynamic_reloc) 519 (bfd *, arelent **, struct bfd_symbol **); 520 521@end example 522A pointer to an alternative bfd_target in case the current one is not 523satisfactory. This can happen when the target cpu supports both big 524and little endian code, and target chosen by the linker has the wrong 525endianness. The function open_output() in ld/ldlang.c uses this field 526to find an alternative output format that is suitable. 527@example 528 /* Opposite endian version of this target. */ 529 const struct bfd_target * alternative_target; 530 531 /* Data for use by back-end routines, which isn't 532 generic enough to belong in this structure. */ 533 const void *backend_data; 534 535@} bfd_target; 536 537@end example 538 539@findex bfd_set_default_target 540@subsubsection @code{bfd_set_default_target} 541@strong{Synopsis} 542@example 543bfd_boolean bfd_set_default_target (const char *name); 544@end example 545@strong{Description}@* 546Set the default target vector to use when recognizing a BFD. 547This takes the name of the target, which may be a BFD target 548name or a configuration triplet. 549 550@findex bfd_find_target 551@subsubsection @code{bfd_find_target} 552@strong{Synopsis} 553@example 554const bfd_target *bfd_find_target (const char *target_name, bfd *abfd); 555@end example 556@strong{Description}@* 557Return a pointer to the transfer vector for the object target 558named @var{target_name}. If @var{target_name} is @code{NULL}, 559choose the one in the environment variable @code{GNUTARGET}; if 560that is null or not defined, then choose the first entry in the 561target list. Passing in the string "default" or setting the 562environment variable to "default" will cause the first entry in 563the target list to be returned, and "target_defaulted" will be 564set in the BFD if @var{abfd} isn't @code{NULL}. This causes 565@code{bfd_check_format} to loop over all the targets to find the 566one that matches the file being read. 567 568@findex bfd_get_target_info 569@subsubsection @code{bfd_get_target_info} 570@strong{Synopsis} 571@example 572const bfd_target *bfd_get_target_info (const char *target_name, 573 bfd *abfd, 574 bfd_boolean *is_bigendian, 575 int *underscoring, 576 const char **def_target_arch); 577@end example 578@strong{Description}@* 579Return a pointer to the transfer vector for the object target 580named @var{target_name}. If @var{target_name} is @code{NULL}, 581choose the one in the environment variable @code{GNUTARGET}; if 582that is null or not defined, then choose the first entry in the 583target list. Passing in the string "default" or setting the 584environment variable to "default" will cause the first entry in 585the target list to be returned, and "target_defaulted" will be 586set in the BFD if @var{abfd} isn't @code{NULL}. This causes 587@code{bfd_check_format} to loop over all the targets to find the 588one that matches the file being read. 589If @var{is_bigendian} is not @code{NULL}, then set this value to target's 590endian mode. True for big-endian, FALSE for little-endian or for 591invalid target. 592If @var{underscoring} is not @code{NULL}, then set this value to target's 593underscoring mode. Zero for none-underscoring, -1 for invalid target, 594else the value of target vector's symbol underscoring. 595If @var{def_target_arch} is not @code{NULL}, then set it to the architecture 596string specified by the target_name. 597 598@findex bfd_target_list 599@subsubsection @code{bfd_target_list} 600@strong{Synopsis} 601@example 602const char ** bfd_target_list (void); 603@end example 604@strong{Description}@* 605Return a freshly malloced NULL-terminated 606vector of the names of all the valid BFD targets. Do not 607modify the names. 608 609@findex bfd_seach_for_target 610@subsubsection @code{bfd_seach_for_target} 611@strong{Synopsis} 612@example 613const bfd_target *bfd_search_for_target 614 (int (*search_func) (const bfd_target *, void *), 615 void *); 616@end example 617@strong{Description}@* 618Return a pointer to the first transfer vector in the list of 619transfer vectors maintained by BFD that produces a non-zero 620result when passed to the function @var{search_func}. The 621parameter @var{data} is passed, unexamined, to the search 622function. 623 624@findex bfd_flavour_name 625@subsubsection @code{bfd_flavour_name} 626@strong{Synopsis} 627@example 628const char *bfd_flavour_name (enum bfd_flavour flavour); 629@end example 630@strong{Description}@* 631Return the string form of @var{flavour}. 632 633