bfd/targets.c

   1 /* Generic target-file-type support for the BFD library.
   2    Copyright 1990, 1991, 1992, 1993 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24
  25 /*
  26 SECTION
  27         Targets
  28
  29 DESCRIPTION
  30         Each port of BFD to a different machine requries the creation
  31         of a target back end. All the back end provides to the root
  32         part of BFD is a structure containing pointers to functions
  33         which perform certain low level operations on files. BFD
  34         translates the applications's requests through a pointer into
  35         calls to the back end routines.
  36
  37         When a file is opened with <<bfd_openr>>, its format and
  38         target are unknown. BFD uses various mechanisms to determine
  39         how to interpret the file. The operations performed are:
  40
  41         o Create a BFD by calling the internal routine
  42         <<new_bfd>>, then call <<bfd_find_target>> with the
  43         target string supplied to <<bfd_openr>> and the new BFD pointer.
  44
  45         o If a null target string was provided to <<bfd_find_target>>,
  46         look up the environment variable <<GNUTARGET>> and use
  47         that as the target string.
  48
  49         o If the target string is still <<NULL>>, or the target string is
  50         <<default>>, then use the first item in the target vector
  51         as the target type, and set <<target_defaulted>> in the BFD to
  52         cause <<bfd_check_format>> to loop through all the targets.
  53         @xref{bfd_target}.  @xref{Formats}.
  54
  55         o Otherwise, inspect the elements in the target vector
  56         one by one, until a match on target name is found. When found,
  57         use it.
  58
  59         o Otherwise return the error <<invalid_target>> to
  60         <<bfd_openr>>.
  61
  62         o <<bfd_openr>> attempts to open the file using
  63         <<bfd_open_file>>, and returns the BFD.
  64
  65         Once the BFD has been opened and the target selected, the file
  66         format may be determined. This is done by calling
  67         <<bfd_check_format>> on the BFD with a suggested format.
  68         If <<target_defaulted>> has been set, each possible target
  69         type is tried to see if it recognizes the specified format.
  70         <<bfd_check_format>> returns <<true>> when the caller guesses right.
  71 @menu
  72 @* bfd_target::
  73 @end menu
  74 */
  75
  76
  77 /*
  78
  79 INODE
  80         bfd_target,  , Targets, Targets
  81 DOCDD
  82 SUBSECTION
  83         bfd_target
  84
  85 DESCRIPTION
  86         This structure contains everything that BFD knows about a
  87         target. It includes things like its byte order, name, and which
  88         routines to call to do various operations.
  89
  90         Every BFD points to a target structure with its <<xvec>>
  91         member.
  92
  93         The macros below are used to dispatch to functions through the
  94         <<bfd_target>> vector. They are used in a number of macros further
  95         down in @file{bfd.h}, and are also used when calling various
  96         routines by hand inside the BFD implementation.  The @var{arglist}
  97         argument must be parenthesized; it contains all the arguments
  98         to the called function.
  99
 100         They make the documentation (more) unpleasant to read, so if
 101         someone wants to fix this and not break the above, please do.
 102
 103 .#define BFD_SEND(bfd, message, arglist) \
 104 .               ((*((bfd)->xvec->message)) arglist)
 105
 106         For operations which index on the BFD format:
 107
 108 .#define BFD_SEND_FMT(bfd, message, arglist) \
 109 .            (((bfd)->xvec->message[(int)((bfd)->format)]) arglist)
 110
 111         This is the structure which defines the type of BFD this is.  The
 112         <<xvec>> member of the struct <<bfd>> itself points here.  Each
 113         module that implements access to a different target under BFD,
 114         defines one of these.
 115
 116
 117         FIXME, these names should be rationalised with the names of
 118         the entry points which call them. Too bad we can't have one
 119         macro to define them both!
 120
 121 .enum bfd_flavour {
 122 .  bfd_target_unknown_flavour,
 123 .  bfd_target_aout_flavour,
 124 .  bfd_target_coff_flavour,
 125 .  bfd_target_ecoff_flavour,
 126 .  bfd_target_elf_flavour,
 127 .  bfd_target_ieee_flavour,
 128 .  bfd_target_nlm_flavour,
 129 .  bfd_target_oasys_flavour,
 130 .  bfd_target_tekhex_flavour,
 131 .  bfd_target_srec_flavour,
 132 .  bfd_target_som_flavour};
 133
 134 .typedef struct bfd_target
 135 .{
 136
 137 Identifies the kind of target, e.g., SunOS4, Ultrix, etc.
 138
 139 .  char *name;
 140
 141 The "flavour" of a back end is a general indication about the contents
 142 of a file.
 143
 144 .  enum bfd_flavour flavour;
 145
 146 The order of bytes within the data area of a file.
 147
 148 .  boolean byteorder_big_p;
 149
 150 The order of bytes within the header parts of a file.
 151
 152 .  boolean header_byteorder_big_p;
 153
 154 A mask of all the flags which an executable may have set -
 155 from the set <<NO_FLAGS>>, <<HAS_RELOC>>, ...<<D_PAGED>>.
 156
 157 .  flagword object_flags;
 158
 159 A mask of all the flags which a section may have set - from
 160 the set <<SEC_NO_FLAGS>>, <<SEC_ALLOC>>, ...<<SET_NEVER_LOAD>>.
 161
 162 .  flagword section_flags;
 163
 164 The character normally found at the front of a symbol
 165 (if any), perhaps `_'.
 166
 167 .  char symbol_leading_char;
 168
 169 The pad character for file names within an archive header.
 170
 171 .  char ar_pad_char;
 172
 173 The maximum number of characters in an archive header.
 174
 175 .  unsigned short ar_max_namelen;
 176
 177 The minimum alignment restriction for any section.
 178
 179 .  unsigned int align_power_min;
 180
 181 Entries for byte swapping for data. These are different from the other
 182 entry points, since they don't take a BFD asthe first argument.
 183 Certain other handlers could do the same.
 184
 185 .  bfd_vma      (*bfd_getx64) PARAMS ((bfd_byte *));
 186 .  bfd_signed_vma (*bfd_getx_signed_64) PARAMS ((bfd_byte *));
 187 .  void         (*bfd_putx64) PARAMS ((bfd_vma, bfd_byte *));
 188 .  bfd_vma      (*bfd_getx32) PARAMS ((bfd_byte *));
 189 .  bfd_signed_vma (*bfd_getx_signed_32) PARAMS ((bfd_byte *));
 190 .  void         (*bfd_putx32) PARAMS ((bfd_vma, bfd_byte *));
 191 .  bfd_vma      (*bfd_getx16) PARAMS ((bfd_byte *));
 192 .  bfd_signed_vma (*bfd_getx_signed_16) PARAMS ((bfd_byte *));
 193 .  void         (*bfd_putx16) PARAMS ((bfd_vma, bfd_byte *));
 194
 195 Byte swapping for the headers
 196
 197 .  bfd_vma      (*bfd_h_getx64) PARAMS ((bfd_byte *));
 198 .  bfd_signed_vma (*bfd_h_getx_signed_64) PARAMS ((bfd_byte *));
 199 .  void         (*bfd_h_putx64) PARAMS ((bfd_vma, bfd_byte *));
 200 .  bfd_vma      (*bfd_h_getx32) PARAMS ((bfd_byte *));
 201 .  bfd_signed_vma (*bfd_h_getx_signed_32) PARAMS ((bfd_byte *));
 202 .  void         (*bfd_h_putx32) PARAMS ((bfd_vma, bfd_byte *));
 203 .  bfd_vma      (*bfd_h_getx16) PARAMS ((bfd_byte *));
 204 .  bfd_signed_vma (*bfd_h_getx_signed_16) PARAMS ((bfd_byte *));
 205 .  void         (*bfd_h_putx16) PARAMS ((bfd_vma, bfd_byte *));
 206
 207 Format dependent routines: these are vectors of entry points
 208 within the target vector structure, one for each format to check.
 209
 210 Check the format of a file being read.  Return a <<bfd_target *>> or zero.
 211
 212 .  struct bfd_target * (*_bfd_check_format[bfd_type_end]) PARAMS ((bfd *));
 213
 214 Set the format of a file being written.
 215
 216 .  boolean             (*_bfd_set_format[bfd_type_end]) PARAMS ((bfd *));
 217
 218 Write cached information into a file being written, at <<bfd_close>>.
 219
 220 .  boolean             (*_bfd_write_contents[bfd_type_end]) PARAMS ((bfd *));
 221
 222 The following functions are defined in <<JUMP_TABLE>>. The idea is
 223 that the back end writer of <<foo>> names all the routines
 224 <<foo_>>@var{entry_point}; <<JUMP_TABLE>> will build the entries
 225 in this structure in the right order.
 226
 227 Core file entry points.
 228
 229 .  char *   (*_core_file_failing_command) PARAMS ((bfd *));
 230 .  int      (*_core_file_failing_signal) PARAMS ((bfd *));
 231 .  boolean  (*_core_file_matches_executable_p) PARAMS ((bfd *, bfd *));
 232
 233 Archive entry points.
 234
 235 .  boolean  (*_bfd_slurp_armap) PARAMS ((bfd *));
 236 .  boolean  (*_bfd_slurp_extended_name_table) PARAMS ((bfd *));
 237 .  void     (*_bfd_truncate_arname) PARAMS ((bfd *, CONST char *, char *));
 238 .  boolean  (*write_armap) PARAMS ((bfd *arch,
 239 .                              unsigned int elength,
 240 .                              struct orl *map,
 241 .                              unsigned int orl_count,
 242 .                              int stridx));
 243
 244 Standard stuff.
 245
 246 .  boolean       (*_close_and_cleanup) PARAMS ((bfd *));
 247 .  boolean       (*_bfd_set_section_contents) PARAMS ((bfd *, sec_ptr, PTR,
 248 .                                            file_ptr, bfd_size_type));
 249 .  boolean       (*_bfd_get_section_contents) PARAMS ((bfd *, sec_ptr, PTR,
 250 .                                            file_ptr, bfd_size_type));
 251 .  boolean       (*_new_section_hook) PARAMS ((bfd *, sec_ptr));
 252
 253 Symbols and relocations.
 254
 255 .  unsigned int  (*_get_symtab_upper_bound) PARAMS ((bfd *));
 256 .  unsigned int  (*_bfd_canonicalize_symtab) PARAMS ((bfd *,
 257 .                                              struct symbol_cache_entry **));
 258 .  unsigned int  (*_get_reloc_upper_bound) PARAMS ((bfd *, sec_ptr));
 259 .  unsigned int  (*_bfd_canonicalize_reloc) PARAMS ((bfd *, sec_ptr, arelent **,
 260 .                                              struct symbol_cache_entry **));
 261 .  struct symbol_cache_entry  *
 262 .                (*_bfd_make_empty_symbol) PARAMS ((bfd *));
 263 .  void          (*_bfd_print_symbol) PARAMS ((bfd *, PTR,
 264 .                                      struct symbol_cache_entry *,
 265 .                                      bfd_print_symbol_type));
 266 .#define bfd_print_symbol(b,p,s,e) BFD_SEND(b, _bfd_print_symbol, (b,p,s,e))
 267 .  void          (*_bfd_get_symbol_info) PARAMS ((bfd *,
 268 .                                      struct symbol_cache_entry *,
 269 .                                      symbol_info *));
 270 .#define bfd_get_symbol_info(b,p,e) BFD_SEND(b, _bfd_get_symbol_info, (b,p,e))
 271
 272 .  alent *    (*_get_lineno) PARAMS ((bfd *, struct symbol_cache_entry *));
 273 .
 274 .  boolean    (*_bfd_set_arch_mach) PARAMS ((bfd *, enum bfd_architecture,
 275 .                    unsigned long));
 276 .
 277 .  bfd *      (*openr_next_archived_file) PARAMS ((bfd *arch, bfd *prev));
 278 .
 279 .  boolean    (*_bfd_find_nearest_line) PARAMS ((bfd *abfd,
 280 .                    struct sec *section, struct symbol_cache_entry **symbols,
 281 .                    bfd_vma offset, CONST char **file, CONST char **func,
 282 .                    unsigned int *line));
 283 .
 284 .  int        (*_bfd_stat_arch_elt) PARAMS ((bfd *, struct stat *));
 285 .
 286 .  int        (*_bfd_sizeof_headers) PARAMS ((bfd *, boolean));
 287 .
 288 .  void       (*_bfd_debug_info_start) PARAMS ((bfd *));
 289 .  void       (*_bfd_debug_info_end) PARAMS ((bfd *));
 290 .  void       (*_bfd_debug_info_accumulate) PARAMS ((bfd *, struct sec *));
 291 .
 292 .  bfd_byte * (*_bfd_get_relocated_section_contents) PARAMS ((bfd *,
 293 .                    struct bfd_seclet *, bfd_byte *data,
 294 .                    boolean relocateable));
 295 .
 296 .  boolean    (*_bfd_relax_section) PARAMS ((bfd *, struct sec *,
 297 .                    struct symbol_cache_entry **));
 298 .
 299 .  boolean    (*_bfd_seclet_link) PARAMS ((bfd *, PTR data,
 300 .                     boolean relocateable));
 301
 302 . {* See documentation on reloc types.  *}
 303 . CONST struct reloc_howto_struct *
 304 .       (*reloc_type_lookup) PARAMS ((bfd *abfd,
 305 .                                     bfd_reloc_code_real_type code));
 306 .
 307 . {* Back-door to allow format-aware applications to create debug symbols
 308 .    while using BFD for everything else.  Currently used by the assembler
 309 .    when creating COFF files.  *}
 310 . asymbol *  (*_bfd_make_debug_symbol) PARAMS ((
 311 .       bfd *abfd,
 312 .       void *ptr,
 313 .       unsigned long size));
 314
 315 Data for use by back-end routines, which isn't generic enough to belong
 316 in this structure.
 317
 318 . PTR backend_data;
 319 .} bfd_target;
 320
 321 */
 322
 323 /* All known xvecs (even those that don't compile on all systems).
 324    Alphabetized for easy reference.
 325    They are listed a second time below, since
 326    we can't intermix extern's and initializers.  */
 327 extern bfd_target a29kcoff_big_vec;
 328 extern bfd_target a_out_adobe_vec;
 329 extern bfd_target aout_mips_big_vec;
 330 extern bfd_target aout_mips_little_vec;
 331 extern bfd_target apollocoff_vec;
 332 extern bfd_target b_out_vec_big_host;
 333 extern bfd_target b_out_vec_little_host;
 334 extern bfd_target bfd_elf32_big_generic_vec;
 335 extern bfd_target bfd_elf32_bigmips_vec;
 336 extern bfd_target bfd_elf32_hppa_vec;
 337 extern bfd_target bfd_elf32_i386_vec;
 338 extern bfd_target bfd_elf32_i860_vec;
 339 extern bfd_target bfd_elf32_little_generic_vec;
 340 extern bfd_target bfd_elf32_littlemips_vec;
 341 extern bfd_target bfd_elf32_m68k_vec;
 342 extern bfd_target bfd_elf32_m88k_vec;
 343 extern bfd_target bfd_elf32_sparc_vec;
 344 extern bfd_target bfd_elf64_big_generic_vec;
 345 extern bfd_target bfd_elf64_little_generic_vec;
 346 /* start-sanitize-v9 */
 347 extern bfd_target bfd_elf64_sparc_vec;
 348 /* end-sanitize-v9 */
 349 extern bfd_target demo_64_vec;
 350 extern bfd_target ecoff_big_vec;
 351 extern bfd_target ecoff_little_vec;
 352 extern bfd_target ecoffalpha_little_vec;
 353 extern bfd_target h8300coff_vec;
 354 extern bfd_target h8500coff_vec;
 355 extern bfd_target host_aout_vec;
 356 extern bfd_target hp300bsd_vec;
 357 extern bfd_target hp300hpux_vec;
 358 extern bfd_target som_vec;
 359 extern bfd_target i386aout_vec;
 360 extern bfd_target i386bsd_vec;
 361 extern bfd_target netbsd386_vec;
 362 extern bfd_target i386coff_vec;
 363 extern bfd_target i386linux_vec;
 364 extern bfd_target i386lynx_aout_vec;
 365 extern bfd_target i386lynx_coff_vec;
 366 extern bfd_target i386mach3_vec;
 367 extern bfd_target icoff_big_vec;
 368 extern bfd_target icoff_little_vec;
 369 extern bfd_target ieee_vec;
 370 extern bfd_target m68kcoff_vec;
 371 extern bfd_target m68kcoffun_vec;
 372 extern bfd_target m68klynx_aout_vec;
 373 extern bfd_target m68klynx_coff_vec;
 374 extern bfd_target m88kbcs_vec;
 375 extern bfd_target newsos3_vec;
 376 extern bfd_target nlm32_big_generic_vec;
 377 extern bfd_target nlm32_i386_vec;
 378 extern bfd_target nlm32_sparc_vec;
 379 extern bfd_target nlm32_little_generic_vec;
 380 extern bfd_target nlm64_big_generic_vec;
 381 extern bfd_target nlm64_little_generic_vec;
 382 extern bfd_target oasys_vec;
 383 extern bfd_target rs6000coff_vec;
 384 extern bfd_target shcoff_vec;
 385 extern bfd_target sparclynx_aout_vec;
 386 extern bfd_target sparclynx_coff_vec;
 387 extern bfd_target sunos_big_vec;
 388 extern bfd_target tekhex_vec;
 389 extern bfd_target we32kcoff_vec;
 390 extern bfd_target z8kcoff_vec;
 391
 392 /* srec is always included.  */
 393 extern bfd_target srec_vec;
 394 extern bfd_target symbolsrec_vec;
 395
 396 /* All of the xvecs for core files.  */
 397 extern bfd_target aix386_core_vec;
 398 extern bfd_target hpux_core_vec;
 399 extern bfd_target hppabsd_core_vec;
 400 extern bfd_target osf_core_vec;
 401 extern bfd_target sco_core_vec;
 402 extern bfd_target trad_core_vec;
 403
 404 bfd_target *target_vector[] = {
 405
 406 #ifdef SELECT_VECS
 407
 408         SELECT_VECS,
 409
 410 #else /* not SELECT_VECS */
 411
 412 #ifdef DEFAULT_VECTOR
 413         &DEFAULT_VECTOR,
 414 #endif
 415         /* This list is alphabetized to make it easy to compare
 416            with other vector lists -- the decls above and
 417            the case statement in configure.in.
 418            Vectors that don't compile on all systems, or aren't finished,
 419            should have an entry here with #if 0 around it, to show that
 420            it wasn't omitted by mistake.  */
 421         &a29kcoff_big_vec,
 422         &a_out_adobe_vec,
 423 #if 0                           /* No one seems to use this.  */
 424         &aout_mips_big_vec,
 425 #endif
 426         &aout_mips_little_vec,
 427         &b_out_vec_big_host,
 428         &b_out_vec_little_host,
 429
 430         /* This, and other vectors, may not be used in any *.mt configuration.
 431            But that does not mean they are unnecessary.  If configured
 432            --with-targets=all, objdump or gdb should be able to examine
 433            the file even if we don't recognize the machine type.  */
 434         &bfd_elf32_big_generic_vec,
 435         &bfd_elf32_bigmips_vec,
 436         &bfd_elf32_hppa_vec,
 437         &bfd_elf32_i386_vec,
 438         &bfd_elf32_i860_vec,
 439         &bfd_elf32_little_generic_vec,
 440         &bfd_elf32_littlemips_vec,
 441         &bfd_elf32_m68k_vec,
 442         &bfd_elf32_m88k_vec,
 443         &bfd_elf32_sparc_vec,
 444 #ifdef BFD64                    /* No one seems to use this.  */
 445         &bfd_elf64_big_generic_vec,
 446         &bfd_elf64_little_generic_vec,
 447 #endif
 448 /* start-sanitize-v9 */
 449 #if 0
 450         &bfd_elf64_sparc_vec,
 451 #endif
 452 /* end-sanitize-v9 */
 453 #ifdef BFD64
 454         &demo_64_vec,   /* Only compiled if host has long-long support */
 455 #endif
 456         &ecoff_big_vec,
 457         &ecoff_little_vec,
 458 #if 0
 459         &ecoffalpha_little_vec,
 460 #endif
 461         &h8300coff_vec,
 462         &h8500coff_vec,
 463 #if 0
 464         /* Since a.out files lack decent magic numbers, no way to recognize
 465            which kind of a.out file it is.  */
 466         &host_aout_vec,
 467 #endif
 468 #if 0                           /* Clashes with sunos_big_vec magic no.  */
 469         &hp300bsd_vec,
 470 #endif
 471         &hp300hpux_vec,
 472 #if defined (HOST_HPPAHPUX) || defined (HOST_HPPABSD)
 473         &som_vec,
 474 #endif
 475         &i386aout_vec,
 476         &i386bsd_vec,
 477         &netbsd386_vec,
 478         &i386coff_vec,
 479 #if 0
 480         /* Since a.out files lack decent magic numbers, no way to recognize
 481            which kind of a.out file it is.  */
 482         &i386linux_vec,
 483 #endif
 484         &i386lynx_aout_vec,
 485         &i386lynx_coff_vec,
 486         &icoff_big_vec,
 487         &icoff_little_vec,
 488         &ieee_vec,
 489         &m68kcoff_vec,
 490         &m68kcoffun_vec,
 491         &m68klynx_aout_vec,
 492         &m68klynx_coff_vec,
 493         &m88kbcs_vec,
 494         &newsos3_vec,
 495         &nlm32_big_generic_vec,
 496         &nlm32_i386_vec,
 497         &nlm32_sparc_vec,
 498 #ifdef BFD64
 499         &nlm64_big_generic_vec,
 500         &nlm64_little_generic_vec,
 501 #endif
 502 #if 0
 503         /* We have no oasys tools anymore, so we can't test any of this
 504            anymore. If you want to test the stuff yourself, go ahead...
 505            steve@cygnus.com
 506            Worse, since there is no magic number for archives, there
 507            can be annoying target mis-matches.  */
 508         &oasys_vec,
 509 #endif
 510         &rs6000coff_vec,
 511         &shcoff_vec,
 512         &sparclynx_aout_vec,
 513         &sparclynx_coff_vec,
 514         &sunos_big_vec,
 515 #if 0
 516         &tekhex_vec,
 517 #endif
 518         &we32kcoff_vec,
 519         &z8kcoff_vec,
 520
 521 #endif /* not SELECT_VECS */
 522
 523 /* Always support S-records, for convenience.  */
 524         &srec_vec,
 525         &symbolsrec_vec,
 526
 527 /* Add any required traditional-core-file-handler.  */
 528
 529 #ifdef AIX386_CORE
 530         &aix386_core_vec,
 531 #endif
 532 #ifdef HPUX_CORE
 533         &hpux_core_vec,
 534 #endif
 535 #ifdef HPPABSD_CORE
 536         &hppabsd_core_vec,
 537 #endif
 538 #ifdef OSF_CORE
 539         &osf_core_vec,
 540 #endif
 541 #ifdef  TRAD_CORE
 542         &trad_core_vec,
 543 #endif
 544
 545         NULL /* end of list marker */
 546 };
 547
 548 /* default_vector[0] contains either the address of the default vector,
 549    if there is one, or zero if there isn't.  */
 550
 551 bfd_target *default_vector[] = {
 552 #ifdef DEFAULT_VECTOR
 553         &DEFAULT_VECTOR,
 554 #endif
 555         NULL
 556 };
 557
 558
 559
 560
 561 /*
 562 FUNCTION
 563         bfd_find_target
 564
 565 SYNOPSIS
 566         bfd_target *bfd_find_target(CONST char *target_name, bfd *abfd);
 567
 568 DESCRIPTION
 569         Return a pointer to the transfer vector for the object target
 570         named @var{target_name}.  If @var{target_name} is <<NULL>>, choose the
 571         one in the environment variable <<GNUTARGET>>; if that is null or not
 572         defined, then choose the first entry in the target list.
 573         Passing in the string "default" or setting the environment
 574         variable to "default" will cause the first entry in the target
 575         list to be returned, and "target_defaulted" will be set in the
 576         BFD.  This causes <<bfd_check_format>> to loop over all the
 577         targets to find the one that matches the file being read.
 578 */
 579
 580 bfd_target *
 581 DEFUN(bfd_find_target,(target_name, abfd),
 582       CONST char *target_name AND
 583       bfd *abfd)
 584 {
 585   bfd_target **target;
 586   extern char *getenv ();
 587   CONST char *targname = (target_name ? target_name :
 588                           (CONST char *) getenv ("GNUTARGET"));
 589
 590   /* This is safe; the vector cannot be null */
 591   if (targname == NULL || !strcmp (targname, "default")) {
 592     abfd->target_defaulted = true;
 593     return abfd->xvec = target_vector[0];
 594   }
 595
 596   abfd->target_defaulted = false;
 597
 598   for (target = &target_vector[0]; *target != NULL; target++) {
 599     if (!strcmp (targname, (*target)->name))
 600       return abfd->xvec = *target;
 601   }
 602
 603   bfd_error = invalid_target;
 604   return NULL;
 605 }
 606
 607
 608 /*
 609 FUNCTION
 610         bfd_target_list
 611
 612 SYNOPSIS
 613         CONST char **bfd_target_list(void);
 614
 615 DESCRIPTION
 616         Return a freshly malloced NULL-terminated
 617         vector of the names of all the valid BFD targets. Do not
 618         modify the names.
 619
 620 */
 621
 622 CONST char **
 623 DEFUN_VOID(bfd_target_list)
 624 {
 625   int vec_length= 0;
 626 #ifdef NATIVE_HPPAHPUX_COMPILER
 627   /* The native compiler on the HP9000/700 has a bug which causes it
 628      to loop endlessly when compiling this file.  This avoids it.  */
 629   volatile
 630 #endif
 631     bfd_target **target;
 632   CONST  char **name_list, **name_ptr;
 633
 634   for (target = &target_vector[0]; *target != NULL; target++)
 635     vec_length++;
 636
 637   name_ptr =
 638     name_list = (CONST char **) zalloc ((vec_length + 1) * sizeof (char **));
 639
 640   if (name_list == NULL) {
 641     bfd_error = no_memory;
 642     return NULL;
 643   }
 644
 645   for (target = &target_vector[0]; *target != NULL; target++)
 646     *(name_ptr++) = (*target)->name;
 647
 648   return name_list;
 649 }