bfd/bfd.c

   1 /* Generic BFD library interface and support routines.
   2    Copyright (C) 1990, 91, 92, 93, 94 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 /*
  22 SECTION
  23         <<typedef bfd>>
  24
  25         A BFD has type <<bfd>>; objects of this type are the
  26         cornerstone of any application using BFD. Using BFD
  27         consists of making references though the BFD and to data in the BFD.
  28
  29         Here is the structure that defines the type <<bfd>>.  It
  30         contains the major data about the file and pointers
  31         to the rest of the data.
  32
  33 CODE_FRAGMENT
  34 .
  35 .struct _bfd
  36 .{
  37 .    {* The filename the application opened the BFD with.  *}
  38 .    CONST char *filename;
  39 .
  40 .    {* A pointer to the target jump table.             *}
  41 .    const struct bfd_target *xvec;
  42 .
  43 .    {* To avoid dragging too many header files into every file that
  44 .       includes `<<bfd.h>>', IOSTREAM has been declared as a "char
  45 .       *", and MTIME as a "long".  Their correct types, to which they
  46 .       are cast when used, are "FILE *" and "time_t".    The iostream
  47 .       is the result of an fopen on the filename.  However, if the
  48 .       BFD_IN_MEMORY flag is set, then iostream is actually a pointer
  49 .       to a bfd_in_memory struct.  *}
  50 .    PTR iostream;
  51 .
  52 .    {* Is the file descriptor being cached?  That is, can it be closed as
  53 .       needed, and re-opened when accessed later?  *}
  54 .
  55 .    boolean cacheable;
  56 .
  57 .    {* Marks whether there was a default target specified when the
  58 .       BFD was opened. This is used to select which matching algorithm
  59 .       to use to choose the back end. *}
  60 .
  61 .    boolean target_defaulted;
  62 .
  63 .    {* The caching routines use these to maintain a
  64 .       least-recently-used list of BFDs *}
  65 .
  66 .    struct _bfd *lru_prev, *lru_next;
  67 .
  68 .    {* When a file is closed by the caching routines, BFD retains
  69 .       state information on the file here: *}
  70 .
  71 .    file_ptr where;
  72 .
  73 .    {* and here: (``once'' means at least once) *}
  74 .
  75 .    boolean opened_once;
  76 .
  77 .    {* Set if we have a locally maintained mtime value, rather than
  78 .       getting it from the file each time: *}
  79 .
  80 .    boolean mtime_set;
  81 .
  82 .    {* File modified time, if mtime_set is true: *}
  83 .
  84 .    long mtime;
  85 .
  86 .    {* Reserved for an unimplemented file locking extension.*}
  87 .
  88 .    int ifd;
  89 .
  90 .    {* The format which belongs to the BFD. (object, core, etc.) *}
  91 .
  92 .    bfd_format format;
  93 .
  94 .    {* The direction the BFD was opened with*}
  95 .
  96 .    enum bfd_direction {no_direction = 0,
  97 .                        read_direction = 1,
  98 .                        write_direction = 2,
  99 .                        both_direction = 3} direction;
 100 .
 101 .    {* Format_specific flags*}
 102 .
 103 .    flagword flags;
 104 .
 105 .    {* Currently my_archive is tested before adding origin to
 106 .       anything. I believe that this can become always an add of
 107 .       origin, with origin set to 0 for non archive files.   *}
 108 .
 109 .    file_ptr origin;
 110 .
 111 .    {* Remember when output has begun, to stop strange things
 112 .       from happening. *}
 113 .    boolean output_has_begun;
 114 .
 115 .    {* Pointer to linked list of sections*}
 116 .    struct sec  *sections;
 117 .
 118 .    {* The number of sections *}
 119 .    unsigned int section_count;
 120 .
 121 .    {* Stuff only useful for object files:
 122 .       The start address. *}
 123 .    bfd_vma start_address;
 124 .
 125 .    {* Used for input and output*}
 126 .    unsigned int symcount;
 127 .
 128 .    {* Symbol table for output BFD (with symcount entries) *}
 129 .    struct symbol_cache_entry  **outsymbols;
 130 .
 131 .    {* Pointer to structure which contains architecture information*}
 132 .    const struct bfd_arch_info *arch_info;
 133 .
 134 .    {* Stuff only useful for archives:*}
 135 .    PTR arelt_data;
 136 .    struct _bfd *my_archive;     {* The containing archive BFD.  *}
 137 .    struct _bfd *next;           {* The next BFD in the archive.  *}
 138 .    struct _bfd *archive_head;   {* The first BFD in the archive.  *}
 139 .    boolean has_armap;
 140 .
 141 .    {* A chain of BFD structures involved in a link.  *}
 142 .    struct _bfd *link_next;
 143 .
 144 .    {* A field used by _bfd_generic_link_add_archive_symbols.  This will
 145 .       be used only for archive elements.  *}
 146 .    int archive_pass;
 147 .
 148 .    {* Used by the back end to hold private data. *}
 149 .
 150 .    union
 151 .      {
 152 .      struct aout_data_struct *aout_data;
 153 .      struct artdata *aout_ar_data;
 154 .      struct _oasys_data *oasys_obj_data;
 155 .      struct _oasys_ar_data *oasys_ar_data;
 156 .      struct coff_tdata *coff_obj_data;
 157 .      struct pe_tdata *pe_obj_data;
 158 .      struct xcoff_tdata *xcoff_obj_data;
 159 .      struct ecoff_tdata *ecoff_obj_data;
 160 .      struct ieee_data_struct *ieee_data;
 161 .      struct ieee_ar_data_struct *ieee_ar_data;
 162 .      struct srec_data_struct *srec_data;
 163 .      struct ihex_data_struct *ihex_data;
 164 .      struct tekhex_data_struct *tekhex_data;
 165 .      struct elf_obj_tdata *elf_obj_data;
 166 .      struct nlm_obj_tdata *nlm_obj_data;
 167 .      struct bout_data_struct *bout_data;
 168 .      struct sun_core_struct *sun_core_data;
 169 .      struct trad_core_struct *trad_core_data;
 170 .      struct som_data_struct *som_data;
 171 .      struct hpux_core_struct *hpux_core_data;
 172 .      struct hppabsd_core_struct *hppabsd_core_data;
 173 .      struct sgi_core_struct *sgi_core_data;
 174 .      struct lynx_core_struct *lynx_core_data;
 175 .      struct osf_core_struct *osf_core_data;
 176 .      struct cisco_core_struct *cisco_core_data;
 177 .      struct versados_data_struct *versados_data;
 178 .      PTR any;
 179 .      } tdata;
 180 .
 181 .    {* Used by the application to hold private data*}
 182 .    PTR usrdata;
 183 .
 184 .    {* Where all the allocated stuff under this BFD goes *}
 185 .    struct obstack memory;
 186 .};
 187 .
 188 */
 189
 190 #include "bfd.h"
 191 #include "sysdep.h"
 192
 193 #ifdef ANSI_PROTOTYPES
 194 #include <stdarg.h>
 195 #else
 196 #include <varargs.h>
 197 #endif
 198
 199 #include "bfdlink.h"
 200 #include "libbfd.h"
 201 #include "coff/internal.h"
 202 #include "coff/sym.h"
 203 #include "libcoff.h"
 204 #include "libecoff.h"
 205 #undef obj_symbols
 206 #include "elf-bfd.h"
 207
 208 #include <ctype.h>
 209 \f
 210 /* provide storage for subsystem, stack and heap data which may have been
 211    passed in on the command line.  Ld puts this data into a bfd_link_info
 212    struct which ultimately gets passed in to the bfd.  When it arrives, copy
 213    it to the following struct so that the data will be available in coffcode.h
 214    where it is needed.  The typedef's used are defined in bfd.h */
 215
 216
 217 \f
 218 /*
 219 SECTION
 220         Error reporting
 221
 222         Most BFD functions return nonzero on success (check their
 223         individual documentation for precise semantics).  On an error,
 224         they call <<bfd_set_error>> to set an error condition that callers
 225         can check by calling <<bfd_get_error>>.
 226         If that returns <<bfd_error_system_call>>, then check
 227         <<errno>>.
 228
 229         The easiest way to report a BFD error to the user is to
 230         use <<bfd_perror>>.
 231
 232 SUBSECTION
 233         Type <<bfd_error_type>>
 234
 235         The values returned by <<bfd_get_error>> are defined by the
 236         enumerated type <<bfd_error_type>>.
 237
 238 CODE_FRAGMENT
 239 .
 240 .typedef enum bfd_error
 241 .{
 242 .  bfd_error_no_error = 0,
 243 .  bfd_error_system_call,
 244 .  bfd_error_invalid_target,
 245 .  bfd_error_wrong_format,
 246 .  bfd_error_invalid_operation,
 247 .  bfd_error_no_memory,
 248 .  bfd_error_no_symbols,
 249 .  bfd_error_no_armap,
 250 .  bfd_error_no_more_archived_files,
 251 .  bfd_error_malformed_archive,
 252 .  bfd_error_file_not_recognized,
 253 .  bfd_error_file_ambiguously_recognized,
 254 .  bfd_error_no_contents,
 255 .  bfd_error_nonrepresentable_section,
 256 .  bfd_error_no_debug_section,
 257 .  bfd_error_bad_value,
 258 .  bfd_error_file_truncated,
 259 .  bfd_error_file_too_big,
 260 .  bfd_error_invalid_error_code
 261 .} bfd_error_type;
 262 .
 263 */
 264
 265 #undef strerror
 266 extern char *strerror();
 267
 268 static bfd_error_type bfd_error = bfd_error_no_error;
 269
 270 CONST char *CONST bfd_errmsgs[] = {
 271                         "No error",
 272                         "System call error",
 273                         "Invalid bfd target",
 274                         "File in wrong format",
 275                         "Invalid operation",
 276                         "Memory exhausted",
 277                         "No symbols",
 278                         "Archive has no index; run ranlib to add one",
 279                         "No more archived files",
 280                         "Malformed archive",
 281                         "File format not recognized",
 282                         "File format is ambiguous",
 283                         "Section has no contents",
 284                         "Nonrepresentable section on output",
 285                         "Symbol needs debug section which does not exist",
 286                         "Bad value",
 287                         "File truncated",
 288                         "File too big",
 289                         "#<Invalid error code>"
 290                        };
 291
 292 /*
 293 FUNCTION
 294         bfd_get_error
 295
 296 SYNOPSIS
 297         bfd_error_type bfd_get_error (void);
 298
 299 DESCRIPTION
 300         Return the current BFD error condition.
 301 */
 302
 303 bfd_error_type
 304 bfd_get_error ()
 305 {
 306   return bfd_error;
 307 }
 308
 309 /*
 310 FUNCTION
 311         bfd_set_error
 312
 313 SYNOPSIS
 314         void bfd_set_error (bfd_error_type error_tag);
 315
 316 DESCRIPTION
 317         Set the BFD error condition to be @var{error_tag}.
 318 */
 319
 320 void
 321 bfd_set_error (error_tag)
 322      bfd_error_type error_tag;
 323 {
 324   bfd_error = error_tag;
 325 }
 326
 327 /*
 328 FUNCTION
 329         bfd_errmsg
 330
 331 SYNOPSIS
 332         CONST char *bfd_errmsg (bfd_error_type error_tag);
 333
 334 DESCRIPTION
 335         Return a string describing the error @var{error_tag}, or
 336         the system error if @var{error_tag} is <<bfd_error_system_call>>.
 337 */
 338
 339 CONST char *
 340 bfd_errmsg (error_tag)
 341      bfd_error_type error_tag;
 342 {
 343 #ifndef errno
 344   extern int errno;
 345 #endif
 346   if (error_tag == bfd_error_system_call)
 347     return strerror (errno);
 348
 349   if ((((int)error_tag <(int) bfd_error_no_error) ||
 350        ((int)error_tag > (int)bfd_error_invalid_error_code)))
 351     error_tag = bfd_error_invalid_error_code;/* sanity check */
 352
 353   return bfd_errmsgs [(int)error_tag];
 354 }
 355
 356 /*
 357 FUNCTION
 358         bfd_perror
 359
 360 SYNOPSIS
 361         void bfd_perror (CONST char *message);
 362
 363 DESCRIPTION
 364         Print to the standard error stream a string describing the
 365         last BFD error that occurred, or the last system error if
 366         the last BFD error was a system call failure.  If @var{message}
 367         is non-NULL and non-empty, the error string printed is preceded
 368         by @var{message}, a colon, and a space.  It is followed by a newline.
 369 */
 370
 371 void
 372 bfd_perror (message)
 373      CONST char *message;
 374 {
 375   if (bfd_get_error () == bfd_error_system_call)
 376     perror((char *)message);            /* must be system error then... */
 377   else {
 378     if (message == NULL || *message == '\0')
 379       fprintf (stderr, "%s\n", bfd_errmsg (bfd_get_error ()));
 380     else
 381       fprintf (stderr, "%s: %s\n", message, bfd_errmsg (bfd_get_error ()));
 382   }
 383 }
 384
 385 /*
 386 SUBSECTION
 387         BFD error handler
 388
 389         Some BFD functions want to print messages describing the
 390         problem.  They call a BFD error handler function.  This
 391         function may be overriden by the program.
 392
 393         The BFD error handler acts like printf.
 394
 395 CODE_FRAGMENT
 396 .
 397 .typedef void (*bfd_error_handler_type) PARAMS ((const char *, ...));
 398 .
 399 */
 400
 401 /* The program name used when printing BFD error messages.  */
 402
 403 static const char *_bfd_error_program_name;
 404
 405 /* This is the default routine to handle BFD error messages.  */
 406
 407 #ifdef ANSI_PROTOTYPES
 408
 409 static void _bfd_default_error_handler PARAMS ((const char *s, ...));
 410
 411 static void
 412 _bfd_default_error_handler (const char *s, ...)
 413 {
 414   va_list p;
 415
 416   if (_bfd_error_program_name != NULL)
 417     fprintf (stderr, "%s: ", _bfd_error_program_name);
 418
 419   va_start (p, s);
 420
 421   vfprintf (stderr, s, p);
 422
 423   va_end (p);
 424
 425   fprintf (stderr, "\n");
 426 }
 427
 428 #else /* ! defined (ANSI_PROTOTYPES) */
 429
 430 static void _bfd_default_error_handler ();
 431
 432 static void
 433 _bfd_default_error_handler (va_alist)
 434      va_dcl
 435 {
 436   va_list p;
 437   const char *s;
 438
 439   if (_bfd_error_program_name != NULL)
 440     fprintf (stderr, "%s: ", _bfd_error_program_name);
 441
 442   va_start (p);
 443
 444   s = va_arg (p, const char *);
 445   vfprintf (stderr, s, p);
 446
 447   va_end (p);
 448
 449   fprintf (stderr, "\n");
 450 }
 451
 452 #endif /* ! defined (ANSI_PROTOTYPES) */
 453
 454 /* This is a function pointer to the routine which should handle BFD
 455    error messages.  It is called when a BFD routine encounters an
 456    error for which it wants to print a message.  Going through a
 457    function pointer permits a program linked against BFD to intercept
 458    the messages and deal with them itself.  */
 459
 460 bfd_error_handler_type _bfd_error_handler = _bfd_default_error_handler;
 461
 462 /*
 463 FUNCTION
 464         bfd_set_error_handler
 465
 466 SYNOPSIS
 467         bfd_error_handler_type bfd_set_error_handler (bfd_error_handler_type);
 468
 469 DESCRIPTION
 470         Set the BFD error handler function.  Returns the previous
 471         function.
 472 */
 473
 474 bfd_error_handler_type
 475 bfd_set_error_handler (pnew)
 476      bfd_error_handler_type pnew;
 477 {
 478   bfd_error_handler_type pold;
 479
 480   pold = _bfd_error_handler;
 481   _bfd_error_handler = pnew;
 482   return pold;
 483 }
 484
 485 /*
 486 FUNCTION
 487         bfd_set_error_program_name
 488
 489 SYNOPSIS
 490         void bfd_set_error_program_name (const char *);
 491
 492 DESCRIPTION
 493         Set the program name to use when printing a BFD error.  This
 494         is printed before the error message followed by a colon and
 495         space.  The string must not be changed after it is passed to
 496         this function.
 497 */
 498
 499 void
 500 bfd_set_error_program_name (name)
 501      const char *name;
 502 {
 503   _bfd_error_program_name = name;
 504 }
 505 \f
 506 /*
 507 SECTION
 508         Symbols
 509 */
 510
 511 /*
 512 FUNCTION
 513         bfd_get_reloc_upper_bound
 514
 515 SYNOPSIS
 516         long bfd_get_reloc_upper_bound(bfd *abfd, asection *sect);
 517
 518 DESCRIPTION
 519         Return the number of bytes required to store the
 520         relocation information associated with section @var{sect}
 521         attached to bfd @var{abfd}.  If an error occurs, return -1.
 522
 523 */
 524
 525
 526 long
 527 bfd_get_reloc_upper_bound (abfd, asect)
 528      bfd *abfd;
 529      sec_ptr asect;
 530 {
 531   if (abfd->format != bfd_object) {
 532     bfd_set_error (bfd_error_invalid_operation);
 533     return -1;
 534   }
 535
 536   return BFD_SEND (abfd, _get_reloc_upper_bound, (abfd, asect));
 537 }
 538
 539 /*
 540 FUNCTION
 541         bfd_canonicalize_reloc
 542
 543 SYNOPSIS
 544         long bfd_canonicalize_reloc
 545                 (bfd *abfd,
 546                 asection *sec,
 547                 arelent **loc,
 548                 asymbol **syms);
 549
 550 DESCRIPTION
 551         Call the back end associated with the open BFD
 552         @var{abfd} and translate the external form of the relocation
 553         information attached to @var{sec} into the internal canonical
 554         form.  Place the table into memory at @var{loc}, which has
 555         been preallocated, usually by a call to
 556         <<bfd_get_reloc_upper_bound>>.  Returns the number of relocs, or
 557         -1 on error.
 558
 559         The @var{syms} table is also needed for horrible internal magic
 560         reasons.
 561
 562
 563 */
 564 long
 565 bfd_canonicalize_reloc (abfd, asect, location, symbols)
 566      bfd *abfd;
 567      sec_ptr asect;
 568      arelent **location;
 569      asymbol **symbols;
 570 {
 571   if (abfd->format != bfd_object) {
 572     bfd_set_error (bfd_error_invalid_operation);
 573     return -1;
 574   }
 575   return BFD_SEND (abfd, _bfd_canonicalize_reloc,
 576                    (abfd, asect, location, symbols));
 577 }
 578
 579 /*
 580 FUNCTION
 581         bfd_set_reloc
 582
 583 SYNOPSIS
 584         void bfd_set_reloc
 585           (bfd *abfd, asection *sec, arelent **rel, unsigned int count)
 586
 587 DESCRIPTION
 588         Set the relocation pointer and count within
 589         section @var{sec} to the values @var{rel} and @var{count}.
 590         The argument @var{abfd} is ignored.
 591
 592 */
 593 /*ARGSUSED*/
 594 void
 595 bfd_set_reloc (ignore_abfd, asect, location, count)
 596      bfd *ignore_abfd;
 597      sec_ptr asect;
 598      arelent **location;
 599      unsigned int count;
 600 {
 601   asect->orelocation  = location;
 602   asect->reloc_count = count;
 603 }
 604
 605 /*
 606 FUNCTION
 607         bfd_set_file_flags
 608
 609 SYNOPSIS
 610         boolean bfd_set_file_flags(bfd *abfd, flagword flags);
 611
 612 DESCRIPTION
 613         Set the flag word in the BFD @var{abfd} to the value @var{flags}.
 614
 615         Possible errors are:
 616         o <<bfd_error_wrong_format>> - The target bfd was not of object format.
 617         o <<bfd_error_invalid_operation>> - The target bfd was open for reading.
 618         o <<bfd_error_invalid_operation>> -
 619         The flag word contained a bit which was not applicable to the
 620         type of file.  E.g., an attempt was made to set the <<D_PAGED>> bit
 621         on a BFD format which does not support demand paging.
 622
 623 */
 624
 625 boolean
 626 bfd_set_file_flags (abfd, flags)
 627      bfd *abfd;
 628      flagword flags;
 629 {
 630   if (abfd->format != bfd_object) {
 631     bfd_set_error (bfd_error_wrong_format);
 632     return false;
 633   }
 634
 635   if (bfd_read_p (abfd)) {
 636     bfd_set_error (bfd_error_invalid_operation);
 637     return false;
 638   }
 639
 640   bfd_get_file_flags (abfd) = flags;
 641   if ((flags & bfd_applicable_file_flags (abfd)) != flags) {
 642     bfd_set_error (bfd_error_invalid_operation);
 643     return false;
 644   }
 645
 646 return true;
 647 }
 648
 649 void
 650 bfd_assert (file, line)
 651      const char *file;
 652      int line;
 653 {
 654   (*_bfd_error_handler) ("bfd assertion fail %s:%d", file, line);
 655 }
 656
 657
 658 /*
 659 FUNCTION
 660         bfd_set_start_address
 661
 662 SYNOPSIS
 663         boolean bfd_set_start_address(bfd *abfd, bfd_vma vma);
 664
 665 DESCRIPTION
 666         Make @var{vma} the entry point of output BFD @var{abfd}.
 667
 668 RETURNS
 669         Returns <<true>> on success, <<false>> otherwise.
 670 */
 671
 672 boolean
 673 bfd_set_start_address(abfd, vma)
 674 bfd *abfd;
 675 bfd_vma vma;
 676 {
 677   abfd->start_address = vma;
 678   return true;
 679 }
 680
 681
 682 /*
 683 FUNCTION
 684         bfd_get_mtime
 685
 686 SYNOPSIS
 687         long bfd_get_mtime(bfd *abfd);
 688
 689 DESCRIPTION
 690         Return the file modification time (as read from the file system, or
 691         from the archive header for archive members).
 692
 693 */
 694
 695 long
 696 bfd_get_mtime (abfd)
 697      bfd *abfd;
 698 {
 699   FILE *fp;
 700   struct stat buf;
 701
 702   if (abfd->mtime_set)
 703     return abfd->mtime;
 704
 705   fp = bfd_cache_lookup (abfd);
 706   if (0 != fstat (fileno (fp), &buf))
 707     return 0;
 708
 709   abfd->mtime = buf.st_mtime;           /* Save value in case anyone wants it */
 710   return buf.st_mtime;
 711 }
 712
 713 /*
 714 FUNCTION
 715         bfd_get_size
 716
 717 SYNOPSIS
 718         long bfd_get_size(bfd *abfd);
 719
 720 DESCRIPTION
 721         Return the file size (as read from file system) for the file
 722         associated with BFD @var{abfd}.
 723
 724         The initial motivation for, and use of, this routine is not
 725         so we can get the exact size of the object the BFD applies to, since
 726         that might not be generally possible (archive members for example).
 727         It would be ideal if someone could eventually modify
 728         it so that such results were guaranteed.
 729
 730         Instead, we want to ask questions like "is this NNN byte sized
 731         object I'm about to try read from file offset YYY reasonable?"
 732         As as example of where we might do this, some object formats
 733         use string tables for which the first <<sizeof(long)>> bytes of the
 734         table contain the size of the table itself, including the size bytes.
 735         If an application tries to read what it thinks is one of these
 736         string tables, without some way to validate the size, and for
 737         some reason the size is wrong (byte swapping error, wrong location
 738         for the string table, etc.), the only clue is likely to be a read
 739         error when it tries to read the table, or a "virtual memory
 740         exhausted" error when it tries to allocate 15 bazillon bytes
 741         of space for the 15 bazillon byte table it is about to read.
 742         This function at least allows us to answer the quesion, "is the
 743         size reasonable?".
 744 */
 745
 746 long
 747 bfd_get_size (abfd)
 748      bfd *abfd;
 749 {
 750   FILE *fp;
 751   struct stat buf;
 752
 753   if ((abfd->flags & BFD_IN_MEMORY) != 0)
 754     return ((struct bfd_in_memory *) abfd->iostream)->size;
 755
 756   fp = bfd_cache_lookup (abfd);
 757   if (0 != fstat (fileno (fp), &buf))
 758     return 0;
 759
 760   return buf.st_size;
 761 }
 762
 763 /*
 764 FUNCTION
 765         bfd_get_gp_size
 766
 767 SYNOPSIS
 768         int bfd_get_gp_size(bfd *abfd);
 769
 770 DESCRIPTION
 771         Return the maximum size of objects to be optimized using the GP
 772         register under MIPS ECOFF.  This is typically set by the <<-G>>
 773         argument to the compiler, assembler or linker.
 774 */
 775
 776 int
 777 bfd_get_gp_size (abfd)
 778      bfd *abfd;
 779 {
 780   if (abfd->format == bfd_object)
 781     {
 782       if (abfd->xvec->flavour == bfd_target_ecoff_flavour)
 783         return ecoff_data (abfd)->gp_size;
 784       else if (abfd->xvec->flavour == bfd_target_elf_flavour)
 785         return elf_gp_size (abfd);
 786     }
 787   return 0;
 788 }
 789
 790 /*
 791 FUNCTION
 792         bfd_set_gp_size
 793
 794 SYNOPSIS
 795         void bfd_set_gp_size(bfd *abfd, int i);
 796
 797 DESCRIPTION
 798         Set the maximum size of objects to be optimized using the GP
 799         register under ECOFF or MIPS ELF.  This is typically set by
 800         the <<-G>> argument to the compiler, assembler or linker.
 801 */
 802
 803 void
 804 bfd_set_gp_size (abfd, i)
 805      bfd *abfd;
 806      int i;
 807 {
 808   /* Don't try to set GP size on an archive or core file! */
 809   if (abfd->format != bfd_object)
 810     return;
 811   if (abfd->xvec->flavour == bfd_target_ecoff_flavour)
 812     ecoff_data (abfd)->gp_size = i;
 813   else if (abfd->xvec->flavour == bfd_target_elf_flavour)
 814     elf_gp_size (abfd) = i;
 815 }
 816
 817 /*
 818 FUNCTION
 819         bfd_scan_vma
 820
 821 SYNOPSIS
 822         bfd_vma bfd_scan_vma(CONST char *string, CONST char **end, int base);
 823
 824 DESCRIPTION
 825         Convert, like <<strtoul>>, a numerical expression
 826         @var{string} into a <<bfd_vma>> integer, and return that integer.
 827         (Though without as many bells and whistles as <<strtoul>>.)
 828         The expression is assumed to be unsigned (i.e., positive).
 829         If given a @var{base}, it is used as the base for conversion.
 830         A base of 0 causes the function to interpret the string
 831         in hex if a leading "0x" or "0X" is found, otherwise
 832         in octal if a leading zero is found, otherwise in decimal.
 833
 834         Overflow is not detected.
 835 */
 836
 837 bfd_vma
 838 bfd_scan_vma (string, end, base)
 839      CONST char *string;
 840      CONST char **end;
 841      int base;
 842 {
 843   bfd_vma value;
 844   int digit;
 845
 846   /* Let the host do it if possible.  */
 847   if (sizeof(bfd_vma) <= sizeof(unsigned long))
 848     return (bfd_vma) strtoul (string, (char **) end, base);
 849
 850   /* A negative base makes no sense, and we only need to go as high as hex.  */
 851   if ((base < 0) || (base > 16))
 852     return (bfd_vma) 0;
 853
 854   if (base == 0)
 855     {
 856       if (string[0] == '0')
 857         {
 858           if ((string[1] == 'x') || (string[1] == 'X'))
 859             base = 16;
 860           /* XXX should we also allow "0b" or "0B" to set base to 2? */
 861           else
 862             base = 8;
 863         }
 864       else
 865         base = 10;
 866     }
 867   if ((base == 16) &&
 868       (string[0] == '0') && ((string[1] == 'x') || (string[1] == 'X')))
 869     string += 2;
 870   /* XXX should we also skip over "0b" or "0B" if base is 2? */
 871
 872 /* Speed could be improved with a table like hex_value[] in gas.  */
 873 #define HEX_VALUE(c) \
 874   (isxdigit(c) ?                                \
 875     (isdigit(c) ?                               \
 876       (c - '0') :                               \
 877       (10 + c - (islower(c) ? 'a' : 'A'))) :    \
 878     42)
 879
 880   for (value = 0; (digit = HEX_VALUE(*string)) < base; string++)
 881     {
 882       value = value * base + digit;
 883     }
 884
 885   if (end)
 886     *end = string;
 887
 888   return value;
 889 }
 890
 891 /*
 892 FUNCTION
 893         bfd_copy_private_bfd_data
 894
 895 SYNOPSIS
 896         boolean bfd_copy_private_bfd_data(bfd *ibfd, bfd *obfd);
 897
 898 DESCRIPTION
 899         Copy private BFD information from the BFD @var{ibfd} to the
 900         the BFD @var{obfd}.  Return <<true>> on success, <<false>> on error.
 901         Possible error returns are:
 902
 903         o <<bfd_error_no_memory>> -
 904         Not enough memory exists to create private data for @var{obfd}.
 905
 906 .#define bfd_copy_private_bfd_data(ibfd, obfd) \
 907 .     BFD_SEND (ibfd, _bfd_copy_private_bfd_data, \
 908 .               (ibfd, obfd))
 909
 910 */
 911
 912 /*
 913 FUNCTION
 914         bfd_merge_private_bfd_data
 915
 916 SYNOPSIS
 917         boolean bfd_merge_private_bfd_data(bfd *ibfd, bfd *obfd);
 918
 919 DESCRIPTION
 920         Merge private BFD information from the BFD @var{ibfd} to the
 921         the output file BFD @var{obfd} when linking.  Return <<true>>
 922         on success, <<false>> on error.  Possible error returns are:
 923
 924         o <<bfd_error_no_memory>> -
 925         Not enough memory exists to create private data for @var{obfd}.
 926
 927 .#define bfd_merge_private_bfd_data(ibfd, obfd) \
 928 .     BFD_SEND (ibfd, _bfd_merge_private_bfd_data, \
 929 .               (ibfd, obfd))
 930
 931 */
 932
 933 /*
 934 FUNCTION
 935         bfd_set_private_flags
 936
 937 SYNOPSIS
 938         boolean bfd_set_private_flags(bfd *abfd, flagword flags);
 939
 940 DESCRIPTION
 941         Set private BFD flag information in the BFD @var{abfd}.
 942         Return <<true>> on success, <<false>> on error.  Possible error
 943         returns are:
 944
 945         o <<bfd_error_no_memory>> -
 946         Not enough memory exists to create private data for @var{obfd}.
 947
 948 .#define bfd_set_private_flags(abfd, flags) \
 949 .     BFD_SEND (abfd, _bfd_set_private_flags, \
 950 .               (abfd, flags))
 951
 952 */
 953
 954 /*
 955 FUNCTION
 956         stuff
 957
 958 DESCRIPTION
 959         Stuff which should be documented:
 960
 961 .#define bfd_sizeof_headers(abfd, reloc) \
 962 .     BFD_SEND (abfd, _bfd_sizeof_headers, (abfd, reloc))
 963 .
 964 .#define bfd_find_nearest_line(abfd, sec, syms, off, file, func, line) \
 965 .     BFD_SEND (abfd, _bfd_find_nearest_line,  (abfd, sec, syms, off, file, func, line))
 966 .
 967 .       {* Do these three do anything useful at all, for any back end?  *}
 968 .#define bfd_debug_info_start(abfd) \
 969 .        BFD_SEND (abfd, _bfd_debug_info_start, (abfd))
 970 .
 971 .#define bfd_debug_info_end(abfd) \
 972 .        BFD_SEND (abfd, _bfd_debug_info_end, (abfd))
 973 .
 974 .#define bfd_debug_info_accumulate(abfd, section) \
 975 .        BFD_SEND (abfd, _bfd_debug_info_accumulate, (abfd, section))
 976 .
 977 .
 978 .#define bfd_stat_arch_elt(abfd, stat) \
 979 .        BFD_SEND (abfd, _bfd_stat_arch_elt,(abfd, stat))
 980 .
 981 .#define bfd_update_armap_timestamp(abfd) \
 982 .        BFD_SEND (abfd, _bfd_update_armap_timestamp, (abfd))
 983 .
 984 .#define bfd_set_arch_mach(abfd, arch, mach)\
 985 .        BFD_SEND ( abfd, _bfd_set_arch_mach, (abfd, arch, mach))
 986 .
 987 .#define bfd_relax_section(abfd, section, link_info, again) \
 988 .       BFD_SEND (abfd, _bfd_relax_section, (abfd, section, link_info, again))
 989 .
 990 .#define bfd_link_hash_table_create(abfd) \
 991 .       BFD_SEND (abfd, _bfd_link_hash_table_create, (abfd))
 992 .
 993 .#define bfd_link_add_symbols(abfd, info) \
 994 .       BFD_SEND (abfd, _bfd_link_add_symbols, (abfd, info))
 995 .
 996 .#define bfd_final_link(abfd, info) \
 997 .       BFD_SEND (abfd, _bfd_final_link, (abfd, info))
 998 .
 999 .#define bfd_free_cached_info(abfd) \
1000 .       BFD_SEND (abfd, _bfd_free_cached_info, (abfd))
1001 .
1002 .#define bfd_get_dynamic_symtab_upper_bound(abfd) \
1003 .       BFD_SEND (abfd, _bfd_get_dynamic_symtab_upper_bound, (abfd))
1004 .
1005 .#define bfd_print_private_bfd_data(abfd, file)\
1006 .       BFD_SEND (abfd, _bfd_print_private_bfd_data, (abfd, file))
1007 .
1008 .#define bfd_canonicalize_dynamic_symtab(abfd, asymbols) \
1009 .       BFD_SEND (abfd, _bfd_canonicalize_dynamic_symtab, (abfd, asymbols))
1010 .
1011 .#define bfd_get_dynamic_reloc_upper_bound(abfd) \
1012 .       BFD_SEND (abfd, _bfd_get_dynamic_reloc_upper_bound, (abfd))
1013 .
1014 .#define bfd_canonicalize_dynamic_reloc(abfd, arels, asyms) \
1015 .       BFD_SEND (abfd, _bfd_canonicalize_dynamic_reloc, (abfd, arels, asyms))
1016 .
1017 .extern bfd_byte *bfd_get_relocated_section_contents
1018 .       PARAMS ((bfd *, struct bfd_link_info *,
1019 .                 struct bfd_link_order *, bfd_byte *,
1020 .                 boolean, asymbol **));
1021 .
1022
1023 */
1024
1025 bfd_byte *
1026 bfd_get_relocated_section_contents (abfd, link_info, link_order, data,
1027                                     relocateable, symbols)
1028      bfd *abfd;
1029      struct bfd_link_info *link_info;
1030      struct bfd_link_order *link_order;
1031      bfd_byte *data;
1032      boolean relocateable;
1033      asymbol **symbols;
1034 {
1035   bfd *abfd2;
1036   bfd_byte *(*fn) PARAMS ((bfd *, struct bfd_link_info *,
1037                            struct bfd_link_order *, bfd_byte *, boolean,
1038                            asymbol **));
1039
1040   if (link_order->type == bfd_indirect_link_order)
1041     {
1042       abfd2 = link_order->u.indirect.section->owner;
1043       if (abfd2 == 0)
1044         abfd2 = abfd;
1045     }
1046   else
1047     abfd2 = abfd;
1048   fn = abfd2->xvec->_bfd_get_relocated_section_contents;
1049
1050   return (*fn) (abfd, link_info, link_order, data, relocateable, symbols);
1051 }
1052
1053 /* Record information about an ELF program header.  */
1054
1055 boolean
1056 bfd_record_phdr (abfd, type, flags_valid, flags, at_valid, at,
1057                  includes_filehdr, includes_phdrs, count, secs)
1058      bfd *abfd;
1059      unsigned long type;
1060      boolean flags_valid;
1061      flagword flags;
1062      boolean at_valid;
1063      bfd_vma at;
1064      boolean includes_filehdr;
1065      boolean includes_phdrs;
1066      unsigned int count;
1067      asection **secs;
1068 {
1069   struct elf_segment_map *m, **pm;
1070
1071   if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
1072     return true;
1073
1074   m = ((struct elf_segment_map *)
1075        bfd_alloc (abfd,
1076                   (sizeof (struct elf_segment_map)
1077                    + (count - 1) * sizeof (asection *))));
1078   if (m == NULL)
1079     return false;
1080
1081   m->next = NULL;
1082   m->p_type = type;
1083   m->p_flags = flags;
1084   m->p_paddr = at;
1085   m->p_flags_valid = flags_valid;
1086   m->p_paddr_valid = at_valid;
1087   m->includes_filehdr = includes_filehdr;
1088   m->includes_phdrs = includes_phdrs;
1089   m->count = count;
1090   if (count > 0)
1091     memcpy (m->sections, secs, count * sizeof (asection *));
1092
1093   for (pm = &elf_tdata (abfd)->segment_map; *pm != NULL; pm = &(*pm)->next)
1094     ;
1095   *pm = m;
1096
1097   return true;
1098 }