bfd/bfd.c

   1 /* Generic BFD library interface and support routines.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000, 2001, 2002, 2003, 2004
   4    Free Software Foundation, Inc.
   5    Written by Cygnus Support.
   6
   7    This file is part of BFD, the Binary File Descriptor library.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  22
  23 /*
  24 SECTION
  25         <<typedef bfd>>
  26
  27         A BFD has type <<bfd>>; objects of this type are the
  28         cornerstone of any application using BFD. Using BFD
  29         consists of making references though the BFD and to data in the BFD.
  30
  31         Here is the structure that defines the type <<bfd>>.  It
  32         contains the major data about the file and pointers
  33         to the rest of the data.
  34
  35 CODE_FRAGMENT
  36 .
  37 .struct bfd
  38 .{
  39 .  {* A unique identifier of the BFD  *}
  40 .  unsigned int id;
  41 .
  42 .  {* The filename the application opened the BFD with.  *}
  43 .  const char *filename;
  44 .
  45 .  {* A pointer to the target jump table.  *}
  46 .  const struct bfd_target *xvec;
  47 .
  48 .  {* The IOSTREAM, and corresponding IO vector that provide access
  49 .     to the file backing the BFD.  *}
  50 .  void *iostream;
  51 .  const struct bfd_iovec *iovec;
  52 .
  53 .  {* Is the file descriptor being cached?  That is, can it be closed as
  54 .     needed, and re-opened when accessed later?  *}
  55 .  bfd_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 .  bfd_boolean target_defaulted;
  61 .
  62 .  {* The caching routines use these to maintain a
  63 .     least-recently-used list of BFDs.  *}
  64 .  struct bfd *lru_prev, *lru_next;
  65 .
  66 .  {* When a file is closed by the caching routines, BFD retains
  67 .     state information on the file here...  *}
  68 .  ufile_ptr where;
  69 .
  70 .  {* ... and here: (``once'' means at least once).  *}
  71 .  bfd_boolean opened_once;
  72 .
  73 .  {* Set if we have a locally maintained mtime value, rather than
  74 .     getting it from the file each time.  *}
  75 .  bfd_boolean mtime_set;
  76 .
  77 .  {* File modified time, if mtime_set is TRUE.  *}
  78 .  long mtime;
  79 .
  80 .  {* Reserved for an unimplemented file locking extension.  *}
  81 .  int ifd;
  82 .
  83 .  {* The format which belongs to the BFD. (object, core, etc.)  *}
  84 .  bfd_format format;
  85 .
  86 .  {* The direction with which the BFD was opened.  *}
  87 .  enum bfd_direction
  88 .    {
  89 .      no_direction = 0,
  90 .      read_direction = 1,
  91 .      write_direction = 2,
  92 .      both_direction = 3
  93 .    }
  94 .  direction;
  95 .
  96 .  {* Format_specific flags.  *}
  97 .  flagword flags;
  98 .
  99 .  {* Currently my_archive is tested before adding origin to
 100 .     anything. I believe that this can become always an add of
 101 .     origin, with origin set to 0 for non archive files.  *}
 102 .  ufile_ptr origin;
 103 .
 104 .  {* Remember when output has begun, to stop strange things
 105 .     from happening.  *}
 106 .  bfd_boolean output_has_begun;
 107 .
 108 .  {* A hash table for section names.  *}
 109 .  struct bfd_hash_table section_htab;
 110 .
 111 .  {* Pointer to linked list of sections.  *}
 112 .  struct bfd_section *sections;
 113 .
 114 .  {* The place where we add to the section list.  *}
 115 .  struct bfd_section **section_tail;
 116 .
 117 .  {* The number of sections.  *}
 118 .  unsigned int section_count;
 119 .
 120 .  {* Stuff only useful for object files:
 121 .     The start address.  *}
 122 .  bfd_vma start_address;
 123 .
 124 .  {* Used for input and output.  *}
 125 .  unsigned int symcount;
 126 .
 127 .  {* Symbol table for output BFD (with symcount entries).  *}
 128 .  struct bfd_symbol  **outsymbols;
 129 .
 130 .  {* Used for slurped dynamic symbol tables.  *}
 131 .  unsigned int dynsymcount;
 132 .
 133 .  {* Pointer to structure which contains architecture information.  *}
 134 .  const struct bfd_arch_info *arch_info;
 135 .
 136 .  {* Stuff only useful for archives.  *}
 137 .  void *arelt_data;
 138 .  struct bfd *my_archive;      {* The containing archive BFD.  *}
 139 .  struct bfd *next;            {* The next BFD in the archive.  *}
 140 .  struct bfd *archive_head;    {* The first BFD in the archive.  *}
 141 .  bfd_boolean has_armap;
 142 .
 143 .  {* A chain of BFD structures involved in a link.  *}
 144 .  struct bfd *link_next;
 145 .
 146 .  {* A field used by _bfd_generic_link_add_archive_symbols.  This will
 147 .     be used only for archive elements.  *}
 148 .  int archive_pass;
 149 .
 150 .  {* Used by the back end to hold private data.  *}
 151 .  union
 152 .    {
 153 .      struct aout_data_struct *aout_data;
 154 .      struct artdata *aout_ar_data;
 155 .      struct _oasys_data *oasys_obj_data;
 156 .      struct _oasys_ar_data *oasys_ar_data;
 157 .      struct coff_tdata *coff_obj_data;
 158 .      struct pe_tdata *pe_obj_data;
 159 .      struct xcoff_tdata *xcoff_obj_data;
 160 .      struct ecoff_tdata *ecoff_obj_data;
 161 .      struct ieee_data_struct *ieee_data;
 162 .      struct ieee_ar_data_struct *ieee_ar_data;
 163 .      struct srec_data_struct *srec_data;
 164 .      struct ihex_data_struct *ihex_data;
 165 .      struct tekhex_data_struct *tekhex_data;
 166 .      struct elf_obj_tdata *elf_obj_data;
 167 .      struct nlm_obj_tdata *nlm_obj_data;
 168 .      struct bout_data_struct *bout_data;
 169 .      struct mmo_data_struct *mmo_data;
 170 .      struct sun_core_struct *sun_core_data;
 171 .      struct sco5_core_struct *sco5_core_data;
 172 .      struct trad_core_struct *trad_core_data;
 173 .      struct som_data_struct *som_data;
 174 .      struct hpux_core_struct *hpux_core_data;
 175 .      struct hppabsd_core_struct *hppabsd_core_data;
 176 .      struct sgi_core_struct *sgi_core_data;
 177 .      struct lynx_core_struct *lynx_core_data;
 178 .      struct osf_core_struct *osf_core_data;
 179 .      struct cisco_core_struct *cisco_core_data;
 180 .      struct versados_data_struct *versados_data;
 181 .      struct netbsd_core_struct *netbsd_core_data;
 182 .      struct mach_o_data_struct *mach_o_data;
 183 .      struct mach_o_fat_data_struct *mach_o_fat_data;
 184 .      struct bfd_pef_data_struct *pef_data;
 185 .      struct bfd_pef_xlib_data_struct *pef_xlib_data;
 186 .      struct bfd_sym_data_struct *sym_data;
 187 .      void *any;
 188 .    }
 189 .  tdata;
 190 .
 191 .  {* Used by the application to hold private data.  *}
 192 .  void *usrdata;
 193 .
 194 .  {* Where all the allocated stuff under this BFD goes.  This is a
 195 .     struct objalloc *, but we use void * to avoid requiring the inclusion
 196 .     of objalloc.h.  *}
 197 .  void *memory;
 198 .};
 199 .
 200 */
 201
 202 #include "bfd.h"
 203 #include "bfdver.h"
 204 #include "sysdep.h"
 205 #include <stdarg.h>
 206 #include "libiberty.h"
 207 #include "safe-ctype.h"
 208 #include "bfdlink.h"
 209 #include "libbfd.h"
 210 #include "coff/internal.h"
 211 #include "coff/sym.h"
 212 #include "libcoff.h"
 213 #include "libecoff.h"
 214 #undef obj_symbols
 215 #include "elf-bfd.h"
 216 \f
 217 /* provide storage for subsystem, stack and heap data which may have been
 218    passed in on the command line.  Ld puts this data into a bfd_link_info
 219    struct which ultimately gets passed in to the bfd.  When it arrives, copy
 220    it to the following struct so that the data will be available in coffcode.h
 221    where it is needed.  The typedef's used are defined in bfd.h */
 222 \f
 223 /*
 224 SECTION
 225         Error reporting
 226
 227         Most BFD functions return nonzero on success (check their
 228         individual documentation for precise semantics).  On an error,
 229         they call <<bfd_set_error>> to set an error condition that callers
 230         can check by calling <<bfd_get_error>>.
 231         If that returns <<bfd_error_system_call>>, then check
 232         <<errno>>.
 233
 234         The easiest way to report a BFD error to the user is to
 235         use <<bfd_perror>>.
 236
 237 SUBSECTION
 238         Type <<bfd_error_type>>
 239
 240         The values returned by <<bfd_get_error>> are defined by the
 241         enumerated type <<bfd_error_type>>.
 242
 243 CODE_FRAGMENT
 244 .
 245 .typedef enum bfd_error
 246 .{
 247 .  bfd_error_no_error = 0,
 248 .  bfd_error_system_call,
 249 .  bfd_error_invalid_target,
 250 .  bfd_error_wrong_format,
 251 .  bfd_error_wrong_object_format,
 252 .  bfd_error_invalid_operation,
 253 .  bfd_error_no_memory,
 254 .  bfd_error_no_symbols,
 255 .  bfd_error_no_armap,
 256 .  bfd_error_no_more_archived_files,
 257 .  bfd_error_malformed_archive,
 258 .  bfd_error_file_not_recognized,
 259 .  bfd_error_file_ambiguously_recognized,
 260 .  bfd_error_no_contents,
 261 .  bfd_error_nonrepresentable_section,
 262 .  bfd_error_no_debug_section,
 263 .  bfd_error_bad_value,
 264 .  bfd_error_file_truncated,
 265 .  bfd_error_file_too_big,
 266 .  bfd_error_invalid_error_code
 267 .}
 268 .bfd_error_type;
 269 .
 270 */
 271
 272 static bfd_error_type bfd_error = bfd_error_no_error;
 273
 274 const char *const bfd_errmsgs[] =
 275 {
 276   N_("No error"),
 277   N_("System call error"),
 278   N_("Invalid bfd target"),
 279   N_("File in wrong format"),
 280   N_("Archive object file in wrong format"),
 281   N_("Invalid operation"),
 282   N_("Memory exhausted"),
 283   N_("No symbols"),
 284   N_("Archive has no index; run ranlib to add one"),
 285   N_("No more archived files"),
 286   N_("Malformed archive"),
 287   N_("File format not recognized"),
 288   N_("File format is ambiguous"),
 289   N_("Section has no contents"),
 290   N_("Nonrepresentable section on output"),
 291   N_("Symbol needs debug section which does not exist"),
 292   N_("Bad value"),
 293   N_("File truncated"),
 294   N_("File too big"),
 295   N_("#<Invalid error code>")
 296 };
 297
 298 /*
 299 FUNCTION
 300         bfd_get_error
 301
 302 SYNOPSIS
 303         bfd_error_type bfd_get_error (void);
 304
 305 DESCRIPTION
 306         Return the current BFD error condition.
 307 */
 308
 309 bfd_error_type
 310 bfd_get_error (void)
 311 {
 312   return bfd_error;
 313 }
 314
 315 /*
 316 FUNCTION
 317         bfd_set_error
 318
 319 SYNOPSIS
 320         void bfd_set_error (bfd_error_type error_tag);
 321
 322 DESCRIPTION
 323         Set the BFD error condition to be @var{error_tag}.
 324 */
 325
 326 void
 327 bfd_set_error (bfd_error_type error_tag)
 328 {
 329   bfd_error = error_tag;
 330 }
 331
 332 /*
 333 FUNCTION
 334         bfd_errmsg
 335
 336 SYNOPSIS
 337         const char *bfd_errmsg (bfd_error_type error_tag);
 338
 339 DESCRIPTION
 340         Return a string describing the error @var{error_tag}, or
 341         the system error if @var{error_tag} is <<bfd_error_system_call>>.
 342 */
 343
 344 const char *
 345 bfd_errmsg (bfd_error_type error_tag)
 346 {
 347 #ifndef errno
 348   extern int errno;
 349 #endif
 350   if (error_tag == bfd_error_system_call)
 351     return xstrerror (errno);
 352
 353   if (error_tag > bfd_error_invalid_error_code)
 354     error_tag = bfd_error_invalid_error_code;   /* sanity check */
 355
 356   return _(bfd_errmsgs [error_tag]);
 357 }
 358
 359 /*
 360 FUNCTION
 361         bfd_perror
 362
 363 SYNOPSIS
 364         void bfd_perror (const char *message);
 365
 366 DESCRIPTION
 367         Print to the standard error stream a string describing the
 368         last BFD error that occurred, or the last system error if
 369         the last BFD error was a system call failure.  If @var{message}
 370         is non-NULL and non-empty, the error string printed is preceded
 371         by @var{message}, a colon, and a space.  It is followed by a newline.
 372 */
 373
 374 void
 375 bfd_perror (const char *message)
 376 {
 377   if (bfd_get_error () == bfd_error_system_call)
 378     /* Must be a system error then.  */
 379     perror ((char *) message);
 380   else
 381     {
 382       if (message == NULL || *message == '\0')
 383         fprintf (stderr, "%s\n", bfd_errmsg (bfd_get_error ()));
 384       else
 385         fprintf (stderr, "%s: %s\n", message, bfd_errmsg (bfd_get_error ()));
 386     }
 387 }
 388
 389 /*
 390 SUBSECTION
 391         BFD error handler
 392
 393         Some BFD functions want to print messages describing the
 394         problem.  They call a BFD error handler function.  This
 395         function may be overridden by the program.
 396
 397         The BFD error handler acts like printf.
 398
 399 CODE_FRAGMENT
 400 .
 401 .typedef void (*bfd_error_handler_type) (const char *, ...);
 402 .
 403 */
 404
 405 /* The program name used when printing BFD error messages.  */
 406
 407 static const char *_bfd_error_program_name;
 408
 409 /* This is the default routine to handle BFD error messages.
 410    Like fprintf (stderr, ...), but also handles some extra format specifiers.
 411
 412    %A section name from section.  For group components, print group name too.
 413    %B file name from bfd.  For archive components, prints archive too.
 414  */
 415
 416 void
 417 _bfd_default_error_handler (const char *fmt, ...)
 418 {
 419   va_list ap;
 420   char *bufp;
 421   const char *new_fmt, *p;
 422   size_t avail = 1000;
 423   char buf[1000];
 424
 425   if (_bfd_error_program_name != NULL)
 426     fprintf (stderr, "%s: ", _bfd_error_program_name);
 427   else
 428     fprintf (stderr, "BFD: ");
 429
 430   va_start (ap, fmt);
 431   new_fmt = fmt;
 432   bufp = buf;
 433
 434   /* Reserve enough space for the existing format string.  */
 435   avail -= strlen (fmt) + 1;
 436   if (avail > 1000)
 437     abort ();
 438
 439   p = fmt;
 440   while (*p != '\0')
 441     {
 442       char *q;
 443       size_t len, extra, trim;
 444
 445       p = strchr (p, '%');
 446       if (p == NULL || p[1] == '\0')
 447         {
 448           if (new_fmt == buf)
 449             {
 450               len = strlen (fmt);
 451               memcpy (bufp, fmt, len + 1);
 452             }
 453           break;
 454         }
 455
 456       if (p[1] == 'A' || p[1] == 'B')
 457         {
 458           len = p - fmt;
 459           memcpy (bufp, fmt, len);
 460           bufp += len;
 461           fmt = p + 2;
 462           new_fmt = buf;
 463
 464           /* If we run out of space, tough, you lose your ridiculously
 465              long file or section name.  It's not safe to try to alloc
 466              memory here;  We might be printing an out of memory message.  */
 467           if (avail == 0)
 468             {
 469               *bufp++ = '*';
 470               *bufp++ = '*';
 471               *bufp = '\0';
 472             }
 473           else
 474             {
 475               if (p[1] == 'B')
 476                 {
 477                   bfd *abfd = va_arg (ap, bfd *);
 478                   if (abfd->my_archive)
 479                     snprintf (bufp, avail, "%s(%s)",
 480                               abfd->my_archive->filename, abfd->filename);
 481                   else
 482                     snprintf (bufp, avail, "%s", abfd->filename);
 483                 }
 484               else
 485                 {
 486                   asection *sec = va_arg (ap, asection *);
 487                   bfd *abfd = sec->owner;
 488                   const char *group = NULL;
 489                   struct coff_comdat_info *ci;
 490
 491                   if (abfd != NULL
 492                       && bfd_get_flavour (abfd) == bfd_target_elf_flavour
 493                       && elf_next_in_group (sec) != NULL
 494                       && (sec->flags & SEC_GROUP) == 0)
 495                     group = elf_group_name (sec);
 496                   else if (abfd != NULL
 497                            && bfd_get_flavour (abfd) == bfd_target_coff_flavour
 498                            && (ci = bfd_coff_get_comdat_section (sec->owner,
 499                                                                  sec)) != NULL)
 500                     group = ci->name;
 501                   if (group != NULL)
 502                     snprintf (bufp, avail, "%s[%s]", sec->name, group);
 503                   else
 504                     snprintf (bufp, avail, "%s", sec->name);
 505                 }
 506               len = strlen (bufp);
 507               avail = avail - len + 2;
 508
 509               /* We need to replace any '%' we printed by "%%".
 510                  First count how many.  */
 511               q = bufp;
 512               bufp += len;
 513               extra = 0;
 514               while ((q = strchr (q, '%')) != NULL)
 515                 {
 516                   ++q;
 517                   ++extra;
 518                 }
 519
 520               /* If there isn't room, trim off the end of the string.  */
 521               q = bufp;
 522               bufp += extra;
 523               if (extra > avail)
 524                 {
 525                   trim = extra - avail;
 526                   bufp -= trim;
 527                   do
 528                     {
 529                       if (*--q == '%')
 530                         --extra;
 531                     }
 532                   while (--trim != 0);
 533                   *q = '\0';
 534                   avail = extra;
 535                 }
 536               avail -= extra;
 537
 538               /* Now double all '%' chars, shuffling the string as we go.  */
 539               while (extra != 0)
 540                 {
 541                   while ((q[extra] = *q) != '%')
 542                     --q;
 543                   q[--extra] = '%';
 544                   --q;
 545                 }
 546             }
 547         }
 548       p = p + 2;
 549     }
 550
 551   vfprintf (stderr, new_fmt, ap);
 552   va_end (ap);
 553
 554   putc ('\n', stderr);
 555 }
 556
 557 /* This is a function pointer to the routine which should handle BFD
 558    error messages.  It is called when a BFD routine encounters an
 559    error for which it wants to print a message.  Going through a
 560    function pointer permits a program linked against BFD to intercept
 561    the messages and deal with them itself.  */
 562
 563 bfd_error_handler_type _bfd_error_handler = _bfd_default_error_handler;
 564
 565 /*
 566 FUNCTION
 567         bfd_set_error_handler
 568
 569 SYNOPSIS
 570         bfd_error_handler_type bfd_set_error_handler (bfd_error_handler_type);
 571
 572 DESCRIPTION
 573         Set the BFD error handler function.  Returns the previous
 574         function.
 575 */
 576
 577 bfd_error_handler_type
 578 bfd_set_error_handler (bfd_error_handler_type pnew)
 579 {
 580   bfd_error_handler_type pold;
 581
 582   pold = _bfd_error_handler;
 583   _bfd_error_handler = pnew;
 584   return pold;
 585 }
 586
 587 /*
 588 FUNCTION
 589         bfd_set_error_program_name
 590
 591 SYNOPSIS
 592         void bfd_set_error_program_name (const char *);
 593
 594 DESCRIPTION
 595         Set the program name to use when printing a BFD error.  This
 596         is printed before the error message followed by a colon and
 597         space.  The string must not be changed after it is passed to
 598         this function.
 599 */
 600
 601 void
 602 bfd_set_error_program_name (const char *name)
 603 {
 604   _bfd_error_program_name = name;
 605 }
 606
 607 /*
 608 FUNCTION
 609         bfd_get_error_handler
 610
 611 SYNOPSIS
 612         bfd_error_handler_type bfd_get_error_handler (void);
 613
 614 DESCRIPTION
 615         Return the BFD error handler function.
 616 */
 617
 618 bfd_error_handler_type
 619 bfd_get_error_handler (void)
 620 {
 621   return _bfd_error_handler;
 622 }
 623 \f
 624 /*
 625 SECTION
 626         Symbols
 627 */
 628
 629 /*
 630 FUNCTION
 631         bfd_get_reloc_upper_bound
 632
 633 SYNOPSIS
 634         long bfd_get_reloc_upper_bound (bfd *abfd, asection *sect);
 635
 636 DESCRIPTION
 637         Return the number of bytes required to store the
 638         relocation information associated with section @var{sect}
 639         attached to bfd @var{abfd}.  If an error occurs, return -1.
 640
 641 */
 642
 643 long
 644 bfd_get_reloc_upper_bound (bfd *abfd, sec_ptr asect)
 645 {
 646   if (abfd->format != bfd_object)
 647     {
 648       bfd_set_error (bfd_error_invalid_operation);
 649       return -1;
 650     }
 651
 652   return BFD_SEND (abfd, _get_reloc_upper_bound, (abfd, asect));
 653 }
 654
 655 /*
 656 FUNCTION
 657         bfd_canonicalize_reloc
 658
 659 SYNOPSIS
 660         long bfd_canonicalize_reloc
 661           (bfd *abfd, asection *sec, arelent **loc, asymbol **syms);
 662
 663 DESCRIPTION
 664         Call the back end associated with the open BFD
 665         @var{abfd} and translate the external form of the relocation
 666         information attached to @var{sec} into the internal canonical
 667         form.  Place the table into memory at @var{loc}, which has
 668         been preallocated, usually by a call to
 669         <<bfd_get_reloc_upper_bound>>.  Returns the number of relocs, or
 670         -1 on error.
 671
 672         The @var{syms} table is also needed for horrible internal magic
 673         reasons.
 674
 675 */
 676 long
 677 bfd_canonicalize_reloc (bfd *abfd,
 678                         sec_ptr asect,
 679                         arelent **location,
 680                         asymbol **symbols)
 681 {
 682   if (abfd->format != bfd_object)
 683     {
 684       bfd_set_error (bfd_error_invalid_operation);
 685       return -1;
 686     }
 687
 688   return BFD_SEND (abfd, _bfd_canonicalize_reloc,
 689                    (abfd, asect, location, symbols));
 690 }
 691
 692 /*
 693 FUNCTION
 694         bfd_set_reloc
 695
 696 SYNOPSIS
 697         void bfd_set_reloc
 698           (bfd *abfd, asection *sec, arelent **rel, unsigned int count);
 699
 700 DESCRIPTION
 701         Set the relocation pointer and count within
 702         section @var{sec} to the values @var{rel} and @var{count}.
 703         The argument @var{abfd} is ignored.
 704
 705 */
 706
 707 void
 708 bfd_set_reloc (bfd *ignore_abfd ATTRIBUTE_UNUSED,
 709                sec_ptr asect,
 710                arelent **location,
 711                unsigned int count)
 712 {
 713   asect->orelocation = location;
 714   asect->reloc_count = count;
 715 }
 716
 717 /*
 718 FUNCTION
 719         bfd_set_file_flags
 720
 721 SYNOPSIS
 722         bfd_boolean bfd_set_file_flags (bfd *abfd, flagword flags);
 723
 724 DESCRIPTION
 725         Set the flag word in the BFD @var{abfd} to the value @var{flags}.
 726
 727         Possible errors are:
 728         o <<bfd_error_wrong_format>> - The target bfd was not of object format.
 729         o <<bfd_error_invalid_operation>> - The target bfd was open for reading.
 730         o <<bfd_error_invalid_operation>> -
 731         The flag word contained a bit which was not applicable to the
 732         type of file.  E.g., an attempt was made to set the <<D_PAGED>> bit
 733         on a BFD format which does not support demand paging.
 734
 735 */
 736
 737 bfd_boolean
 738 bfd_set_file_flags (bfd *abfd, flagword flags)
 739 {
 740   if (abfd->format != bfd_object)
 741     {
 742       bfd_set_error (bfd_error_wrong_format);
 743       return FALSE;
 744     }
 745
 746   if (bfd_read_p (abfd))
 747     {
 748       bfd_set_error (bfd_error_invalid_operation);
 749       return FALSE;
 750     }
 751
 752   bfd_get_file_flags (abfd) = flags;
 753   if ((flags & bfd_applicable_file_flags (abfd)) != flags)
 754     {
 755       bfd_set_error (bfd_error_invalid_operation);
 756       return FALSE;
 757     }
 758
 759   return TRUE;
 760 }
 761
 762 void
 763 bfd_assert (const char *file, int line)
 764 {
 765   (*_bfd_error_handler) (_("BFD %s assertion fail %s:%d"),
 766                          BFD_VERSION_STRING, file, line);
 767 }
 768
 769 /* A more or less friendly abort message.  In libbfd.h abort is
 770    defined to call this function.  */
 771
 772 #ifndef EXIT_FAILURE
 773 #define EXIT_FAILURE 1
 774 #endif
 775
 776 void
 777 _bfd_abort (const char *file, int line, const char *fn)
 778 {
 779   if (fn != NULL)
 780     (*_bfd_error_handler)
 781       (_("BFD %s internal error, aborting at %s line %d in %s\n"),
 782        BFD_VERSION_STRING, file, line, fn);
 783   else
 784     (*_bfd_error_handler)
 785       (_("BFD %s internal error, aborting at %s line %d\n"),
 786        BFD_VERSION_STRING, file, line);
 787   (*_bfd_error_handler) (_("Please report this bug.\n"));
 788   xexit (EXIT_FAILURE);
 789 }
 790
 791 /*
 792 FUNCTION
 793         bfd_get_arch_size
 794
 795 SYNOPSIS
 796         int bfd_get_arch_size (bfd *abfd);
 797
 798 DESCRIPTION
 799         Returns the architecture address size, in bits, as determined
 800         by the object file's format.  For ELF, this information is
 801         included in the header.
 802
 803 RETURNS
 804         Returns the arch size in bits if known, <<-1>> otherwise.
 805 */
 806
 807 int
 808 bfd_get_arch_size (bfd *abfd)
 809 {
 810   if (abfd->xvec->flavour == bfd_target_elf_flavour)
 811     return get_elf_backend_data (abfd)->s->arch_size;
 812
 813   return -1;
 814 }
 815
 816 /*
 817 FUNCTION
 818         bfd_get_sign_extend_vma
 819
 820 SYNOPSIS
 821         int bfd_get_sign_extend_vma (bfd *abfd);
 822
 823 DESCRIPTION
 824         Indicates if the target architecture "naturally" sign extends
 825         an address.  Some architectures implicitly sign extend address
 826         values when they are converted to types larger than the size
 827         of an address.  For instance, bfd_get_start_address() will
 828         return an address sign extended to fill a bfd_vma when this is
 829         the case.
 830
 831 RETURNS
 832         Returns <<1>> if the target architecture is known to sign
 833         extend addresses, <<0>> if the target architecture is known to
 834         not sign extend addresses, and <<-1>> otherwise.
 835 */
 836
 837 int
 838 bfd_get_sign_extend_vma (bfd *abfd)
 839 {
 840   char *name;
 841
 842   if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
 843     return get_elf_backend_data (abfd)->sign_extend_vma;
 844
 845   name = bfd_get_target (abfd);
 846
 847   /* Return a proper value for DJGPP & PE COFF (x86 COFF variants).
 848      This function is required for DWARF2 support, but there is
 849      no place to store this information in the COFF back end.
 850      Should enough other COFF targets add support for DWARF2,
 851      a place will have to be found.  Until then, this hack will do.  */
 852   if (strncmp (name, "coff-go32", sizeof ("coff-go32") - 1) == 0
 853       || strcmp (name, "pe-i386") == 0
 854       || strcmp (name, "pei-i386") == 0)
 855     return 1;
 856
 857   bfd_set_error (bfd_error_wrong_format);
 858   return -1;
 859 }
 860
 861 /*
 862 FUNCTION
 863         bfd_set_start_address
 864
 865 SYNOPSIS
 866         bfd_boolean bfd_set_start_address (bfd *abfd, bfd_vma vma);
 867
 868 DESCRIPTION
 869         Make @var{vma} the entry point of output BFD @var{abfd}.
 870
 871 RETURNS
 872         Returns <<TRUE>> on success, <<FALSE>> otherwise.
 873 */
 874
 875 bfd_boolean
 876 bfd_set_start_address (bfd *abfd, bfd_vma vma)
 877 {
 878   abfd->start_address = vma;
 879   return TRUE;
 880 }
 881
 882 /*
 883 FUNCTION
 884         bfd_get_gp_size
 885
 886 SYNOPSIS
 887         unsigned int bfd_get_gp_size (bfd *abfd);
 888
 889 DESCRIPTION
 890         Return the maximum size of objects to be optimized using the GP
 891         register under MIPS ECOFF.  This is typically set by the <<-G>>
 892         argument to the compiler, assembler or linker.
 893 */
 894
 895 unsigned int
 896 bfd_get_gp_size (bfd *abfd)
 897 {
 898   if (abfd->format == bfd_object)
 899     {
 900       if (abfd->xvec->flavour == bfd_target_ecoff_flavour)
 901         return ecoff_data (abfd)->gp_size;
 902       else if (abfd->xvec->flavour == bfd_target_elf_flavour)
 903         return elf_gp_size (abfd);
 904     }
 905   return 0;
 906 }
 907
 908 /*
 909 FUNCTION
 910         bfd_set_gp_size
 911
 912 SYNOPSIS
 913         void bfd_set_gp_size (bfd *abfd, unsigned int i);
 914
 915 DESCRIPTION
 916         Set the maximum size of objects to be optimized using the GP
 917         register under ECOFF or MIPS ELF.  This is typically set by
 918         the <<-G>> argument to the compiler, assembler or linker.
 919 */
 920
 921 void
 922 bfd_set_gp_size (bfd *abfd, unsigned int i)
 923 {
 924   /* Don't try to set GP size on an archive or core file!  */
 925   if (abfd->format != bfd_object)
 926     return;
 927
 928   if (abfd->xvec->flavour == bfd_target_ecoff_flavour)
 929     ecoff_data (abfd)->gp_size = i;
 930   else if (abfd->xvec->flavour == bfd_target_elf_flavour)
 931     elf_gp_size (abfd) = i;
 932 }
 933
 934 /* Get the GP value.  This is an internal function used by some of the
 935    relocation special_function routines on targets which support a GP
 936    register.  */
 937
 938 bfd_vma
 939 _bfd_get_gp_value (bfd *abfd)
 940 {
 941   if (! abfd)
 942     return 0;
 943   if (abfd->format != bfd_object)
 944     return 0;
 945
 946   if (abfd->xvec->flavour == bfd_target_ecoff_flavour)
 947     return ecoff_data (abfd)->gp;
 948   else if (abfd->xvec->flavour == bfd_target_elf_flavour)
 949     return elf_gp (abfd);
 950
 951   return 0;
 952 }
 953
 954 /* Set the GP value.  */
 955
 956 void
 957 _bfd_set_gp_value (bfd *abfd, bfd_vma v)
 958 {
 959   if (! abfd)
 960     BFD_FAIL ();
 961   if (abfd->format != bfd_object)
 962     return;
 963
 964   if (abfd->xvec->flavour == bfd_target_ecoff_flavour)
 965     ecoff_data (abfd)->gp = v;
 966   else if (abfd->xvec->flavour == bfd_target_elf_flavour)
 967     elf_gp (abfd) = v;
 968 }
 969
 970 /*
 971 FUNCTION
 972         bfd_scan_vma
 973
 974 SYNOPSIS
 975         bfd_vma bfd_scan_vma (const char *string, const char **end, int base);
 976
 977 DESCRIPTION
 978         Convert, like <<strtoul>>, a numerical expression
 979         @var{string} into a <<bfd_vma>> integer, and return that integer.
 980         (Though without as many bells and whistles as <<strtoul>>.)
 981         The expression is assumed to be unsigned (i.e., positive).
 982         If given a @var{base}, it is used as the base for conversion.
 983         A base of 0 causes the function to interpret the string
 984         in hex if a leading "0x" or "0X" is found, otherwise
 985         in octal if a leading zero is found, otherwise in decimal.
 986
 987         If the value would overflow, the maximum <<bfd_vma>> value is
 988         returned.
 989 */
 990
 991 bfd_vma
 992 bfd_scan_vma (const char *string, const char **end, int base)
 993 {
 994   bfd_vma value;
 995   bfd_vma cutoff;
 996   unsigned int cutlim;
 997   int overflow;
 998
 999   /* Let the host do it if possible.  */
1000   if (sizeof (bfd_vma) <= sizeof (unsigned long))
1001     return strtoul (string, (char **) end, base);
1002
1003 #ifdef HAVE_STRTOULL
1004   if (sizeof (bfd_vma) <= sizeof (unsigned long long))
1005     return strtoull (string, (char **) end, base);
1006 #endif
1007
1008   if (base == 0)
1009     {
1010       if (string[0] == '0')
1011         {
1012           if ((string[1] == 'x') || (string[1] == 'X'))
1013             base = 16;
1014           else
1015             base = 8;
1016         }
1017     }
1018
1019   if ((base < 2) || (base > 36))
1020     base = 10;
1021
1022   if (base == 16
1023       && string[0] == '0'
1024       && (string[1] == 'x' || string[1] == 'X')
1025       && ISXDIGIT (string[2]))
1026     {
1027       string += 2;
1028     }
1029
1030   cutoff = (~ (bfd_vma) 0) / (bfd_vma) base;
1031   cutlim = (~ (bfd_vma) 0) % (bfd_vma) base;
1032   value = 0;
1033   overflow = 0;
1034   while (1)
1035     {
1036       unsigned int digit;
1037
1038       digit = *string;
1039       if (ISDIGIT (digit))
1040         digit = digit - '0';
1041       else if (ISALPHA (digit))
1042         digit = TOUPPER (digit) - 'A' + 10;
1043       else
1044         break;
1045       if (digit >= (unsigned int) base)
1046         break;
1047       if (value > cutoff || (value == cutoff && digit > cutlim))
1048         overflow = 1;
1049       value = value * base + digit;
1050       ++string;
1051     }
1052
1053   if (overflow)
1054     value = ~ (bfd_vma) 0;
1055
1056   if (end != NULL)
1057     *end = string;
1058
1059   return value;
1060 }
1061
1062 /*
1063 FUNCTION
1064         bfd_copy_private_header_data
1065
1066 SYNOPSIS
1067         bfd_boolean bfd_copy_private_header_data (bfd *ibfd, bfd *obfd);
1068
1069 DESCRIPTION
1070         Copy private BFD header information from the BFD @var{ibfd} to the
1071         the BFD @var{obfd}.  This copies information that may require
1072         sections to exist, but does not require symbol tables.  Return
1073         <<true>> on success, <<false>> on error.
1074         Possible error returns are:
1075
1076         o <<bfd_error_no_memory>> -
1077         Not enough memory exists to create private data for @var{obfd}.
1078
1079 .#define bfd_copy_private_header_data(ibfd, obfd) \
1080 .     BFD_SEND (obfd, _bfd_copy_private_header_data, \
1081 .               (ibfd, obfd))
1082
1083 */
1084
1085 /*
1086 FUNCTION
1087         bfd_copy_private_bfd_data
1088
1089 SYNOPSIS
1090         bfd_boolean bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd);
1091
1092 DESCRIPTION
1093         Copy private BFD information from the BFD @var{ibfd} to the
1094         the BFD @var{obfd}.  Return <<TRUE>> on success, <<FALSE>> on error.
1095         Possible error returns are:
1096
1097         o <<bfd_error_no_memory>> -
1098         Not enough memory exists to create private data for @var{obfd}.
1099
1100 .#define bfd_copy_private_bfd_data(ibfd, obfd) \
1101 .     BFD_SEND (obfd, _bfd_copy_private_bfd_data, \
1102 .               (ibfd, obfd))
1103
1104 */
1105
1106 /*
1107 FUNCTION
1108         bfd_merge_private_bfd_data
1109
1110 SYNOPSIS
1111         bfd_boolean bfd_merge_private_bfd_data (bfd *ibfd, bfd *obfd);
1112
1113 DESCRIPTION
1114         Merge private BFD information from the BFD @var{ibfd} to the
1115         the output file BFD @var{obfd} when linking.  Return <<TRUE>>
1116         on success, <<FALSE>> on error.  Possible error returns are:
1117
1118         o <<bfd_error_no_memory>> -
1119         Not enough memory exists to create private data for @var{obfd}.
1120
1121 .#define bfd_merge_private_bfd_data(ibfd, obfd) \
1122 .     BFD_SEND (obfd, _bfd_merge_private_bfd_data, \
1123 .               (ibfd, obfd))
1124
1125 */
1126
1127 /*
1128 FUNCTION
1129         bfd_set_private_flags
1130
1131 SYNOPSIS
1132         bfd_boolean bfd_set_private_flags (bfd *abfd, flagword flags);
1133
1134 DESCRIPTION
1135         Set private BFD flag information in the BFD @var{abfd}.
1136         Return <<TRUE>> on success, <<FALSE>> on error.  Possible error
1137         returns are:
1138
1139         o <<bfd_error_no_memory>> -
1140         Not enough memory exists to create private data for @var{obfd}.
1141
1142 .#define bfd_set_private_flags(abfd, flags) \
1143 .     BFD_SEND (abfd, _bfd_set_private_flags, (abfd, flags))
1144
1145 */
1146
1147 /*
1148 FUNCTION
1149         Other functions
1150
1151 DESCRIPTION
1152         The following functions exist but have not yet been documented.
1153
1154 .#define bfd_sizeof_headers(abfd, reloc) \
1155 .       BFD_SEND (abfd, _bfd_sizeof_headers, (abfd, reloc))
1156 .
1157 .#define bfd_find_nearest_line(abfd, sec, syms, off, file, func, line) \
1158 .       BFD_SEND (abfd, _bfd_find_nearest_line, \
1159 .                 (abfd, sec, syms, off, file, func, line))
1160 .
1161 .#define bfd_debug_info_start(abfd) \
1162 .       BFD_SEND (abfd, _bfd_debug_info_start, (abfd))
1163 .
1164 .#define bfd_debug_info_end(abfd) \
1165 .       BFD_SEND (abfd, _bfd_debug_info_end, (abfd))
1166 .
1167 .#define bfd_debug_info_accumulate(abfd, section) \
1168 .       BFD_SEND (abfd, _bfd_debug_info_accumulate, (abfd, section))
1169 .
1170 .#define bfd_stat_arch_elt(abfd, stat) \
1171 .       BFD_SEND (abfd, _bfd_stat_arch_elt,(abfd, stat))
1172 .
1173 .#define bfd_update_armap_timestamp(abfd) \
1174 .       BFD_SEND (abfd, _bfd_update_armap_timestamp, (abfd))
1175 .
1176 .#define bfd_set_arch_mach(abfd, arch, mach)\
1177 .       BFD_SEND ( abfd, _bfd_set_arch_mach, (abfd, arch, mach))
1178 .
1179 .#define bfd_relax_section(abfd, section, link_info, again) \
1180 .       BFD_SEND (abfd, _bfd_relax_section, (abfd, section, link_info, again))
1181 .
1182 .#define bfd_gc_sections(abfd, link_info) \
1183 .       BFD_SEND (abfd, _bfd_gc_sections, (abfd, link_info))
1184 .
1185 .#define bfd_merge_sections(abfd, link_info) \
1186 .       BFD_SEND (abfd, _bfd_merge_sections, (abfd, link_info))
1187 .
1188 .#define bfd_is_group_section(abfd, sec) \
1189 .       BFD_SEND (abfd, _bfd_is_group_section, (abfd, sec))
1190 .
1191 .#define bfd_discard_group(abfd, sec) \
1192 .       BFD_SEND (abfd, _bfd_discard_group, (abfd, sec))
1193 .
1194 .#define bfd_link_hash_table_create(abfd) \
1195 .       BFD_SEND (abfd, _bfd_link_hash_table_create, (abfd))
1196 .
1197 .#define bfd_link_hash_table_free(abfd, hash) \
1198 .       BFD_SEND (abfd, _bfd_link_hash_table_free, (hash))
1199 .
1200 .#define bfd_link_add_symbols(abfd, info) \
1201 .       BFD_SEND (abfd, _bfd_link_add_symbols, (abfd, info))
1202 .
1203 .#define bfd_link_just_syms(sec, info) \
1204 .       BFD_SEND (abfd, _bfd_link_just_syms, (sec, info))
1205 .
1206 .#define bfd_final_link(abfd, info) \
1207 .       BFD_SEND (abfd, _bfd_final_link, (abfd, info))
1208 .
1209 .#define bfd_free_cached_info(abfd) \
1210 .       BFD_SEND (abfd, _bfd_free_cached_info, (abfd))
1211 .
1212 .#define bfd_get_dynamic_symtab_upper_bound(abfd) \
1213 .       BFD_SEND (abfd, _bfd_get_dynamic_symtab_upper_bound, (abfd))
1214 .
1215 .#define bfd_print_private_bfd_data(abfd, file)\
1216 .       BFD_SEND (abfd, _bfd_print_private_bfd_data, (abfd, file))
1217 .
1218 .#define bfd_canonicalize_dynamic_symtab(abfd, asymbols) \
1219 .       BFD_SEND (abfd, _bfd_canonicalize_dynamic_symtab, (abfd, asymbols))
1220 .
1221 .#define bfd_get_synthetic_symtab(abfd, relsyms, ret) \
1222 .       BFD_SEND (abfd, _bfd_get_synthetic_symtab, (abfd, relsyms, ret))
1223 .
1224 .#define bfd_get_dynamic_reloc_upper_bound(abfd) \
1225 .       BFD_SEND (abfd, _bfd_get_dynamic_reloc_upper_bound, (abfd))
1226 .
1227 .#define bfd_canonicalize_dynamic_reloc(abfd, arels, asyms) \
1228 .       BFD_SEND (abfd, _bfd_canonicalize_dynamic_reloc, (abfd, arels, asyms))
1229 .
1230 .extern bfd_byte *bfd_get_relocated_section_contents
1231 .  (bfd *, struct bfd_link_info *, struct bfd_link_order *, bfd_byte *,
1232 .   bfd_boolean, asymbol **);
1233 .
1234
1235 */
1236
1237 bfd_byte *
1238 bfd_get_relocated_section_contents (bfd *abfd,
1239                                     struct bfd_link_info *link_info,
1240                                     struct bfd_link_order *link_order,
1241                                     bfd_byte *data,
1242                                     bfd_boolean relocatable,
1243                                     asymbol **symbols)
1244 {
1245   bfd *abfd2;
1246   bfd_byte *(*fn) (bfd *, struct bfd_link_info *, struct bfd_link_order *,
1247                    bfd_byte *, bfd_boolean, asymbol **);
1248
1249   if (link_order->type == bfd_indirect_link_order)
1250     {
1251       abfd2 = link_order->u.indirect.section->owner;
1252       if (abfd2 == NULL)
1253         abfd2 = abfd;
1254     }
1255   else
1256     abfd2 = abfd;
1257
1258   fn = abfd2->xvec->_bfd_get_relocated_section_contents;
1259
1260   return (*fn) (abfd, link_info, link_order, data, relocatable, symbols);
1261 }
1262
1263 /* Record information about an ELF program header.  */
1264
1265 bfd_boolean
1266 bfd_record_phdr (bfd *abfd,
1267                  unsigned long type,
1268                  bfd_boolean flags_valid,
1269                  flagword flags,
1270                  bfd_boolean at_valid,
1271                  bfd_vma at,
1272                  bfd_boolean includes_filehdr,
1273                  bfd_boolean includes_phdrs,
1274                  unsigned int count,
1275                  asection **secs)
1276 {
1277   struct elf_segment_map *m, **pm;
1278   bfd_size_type amt;
1279
1280   if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
1281     return TRUE;
1282
1283   amt = sizeof (struct elf_segment_map);
1284   amt += ((bfd_size_type) count - 1) * sizeof (asection *);
1285   m = bfd_alloc (abfd, amt);
1286   if (m == NULL)
1287     return FALSE;
1288
1289   m->next = NULL;
1290   m->p_type = type;
1291   m->p_flags = flags;
1292   m->p_paddr = at;
1293   m->p_flags_valid = flags_valid;
1294   m->p_paddr_valid = at_valid;
1295   m->includes_filehdr = includes_filehdr;
1296   m->includes_phdrs = includes_phdrs;
1297   m->count = count;
1298   if (count > 0)
1299     memcpy (m->sections, secs, count * sizeof (asection *));
1300
1301   for (pm = &elf_tdata (abfd)->segment_map; *pm != NULL; pm = &(*pm)->next)
1302     ;
1303   *pm = m;
1304
1305   return TRUE;
1306 }
1307
1308 void
1309 bfd_sprintf_vma (bfd *abfd, char *buf, bfd_vma value)
1310 {
1311   if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
1312     get_elf_backend_data (abfd)->elf_backend_sprintf_vma (abfd, buf, value);
1313   else
1314     sprintf_vma (buf, value);
1315 }
1316
1317 void
1318 bfd_fprintf_vma (bfd *abfd, void *stream, bfd_vma value)
1319 {
1320   if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
1321     get_elf_backend_data (abfd)->elf_backend_fprintf_vma (abfd, stream, value);
1322   else
1323     fprintf_vma ((FILE *) stream, value);
1324 }
1325
1326 /*
1327 FUNCTION
1328         bfd_alt_mach_code
1329
1330 SYNOPSIS
1331         bfd_boolean bfd_alt_mach_code (bfd *abfd, int alternative);
1332
1333 DESCRIPTION
1334
1335         When more than one machine code number is available for the
1336         same machine type, this function can be used to switch between
1337         the preferred one (alternative == 0) and any others.  Currently,
1338         only ELF supports this feature, with up to two alternate
1339         machine codes.
1340 */
1341
1342 bfd_boolean
1343 bfd_alt_mach_code (bfd *abfd, int alternative)
1344 {
1345   if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
1346     {
1347       int code;
1348
1349       switch (alternative)
1350         {
1351         case 0:
1352           code = get_elf_backend_data (abfd)->elf_machine_code;
1353           break;
1354
1355         case 1:
1356           code = get_elf_backend_data (abfd)->elf_machine_alt1;
1357           if (code == 0)
1358             return FALSE;
1359           break;
1360
1361         case 2:
1362           code = get_elf_backend_data (abfd)->elf_machine_alt2;
1363           if (code == 0)
1364             return FALSE;
1365           break;
1366
1367         default:
1368           return FALSE;
1369         }
1370
1371       elf_elfheader (abfd)->e_machine = code;
1372
1373       return TRUE;
1374     }
1375
1376   return FALSE;
1377 }
1378
1379 /*
1380 CODE_FRAGMENT
1381
1382 .struct bfd_preserve
1383 .{
1384 .  void *marker;
1385 .  void *tdata;
1386 .  flagword flags;
1387 .  const struct bfd_arch_info *arch_info;
1388 .  struct bfd_section *sections;
1389 .  struct bfd_section **section_tail;
1390 .  unsigned int section_count;
1391 .  struct bfd_hash_table section_htab;
1392 .};
1393 .
1394 */
1395
1396 /*
1397 FUNCTION
1398         bfd_preserve_save
1399
1400 SYNOPSIS
1401         bfd_boolean bfd_preserve_save (bfd *, struct bfd_preserve *);
1402
1403 DESCRIPTION
1404         When testing an object for compatibility with a particular
1405         target back-end, the back-end object_p function needs to set
1406         up certain fields in the bfd on successfully recognizing the
1407         object.  This typically happens in a piecemeal fashion, with
1408         failures possible at many points.  On failure, the bfd is
1409         supposed to be restored to its initial state, which is
1410         virtually impossible.  However, restoring a subset of the bfd
1411         state works in practice.  This function stores the subset and
1412         reinitializes the bfd.
1413
1414 */
1415
1416 bfd_boolean
1417 bfd_preserve_save (bfd *abfd, struct bfd_preserve *preserve)
1418 {
1419   preserve->tdata = abfd->tdata.any;
1420   preserve->arch_info = abfd->arch_info;
1421   preserve->flags = abfd->flags;
1422   preserve->sections = abfd->sections;
1423   preserve->section_tail = abfd->section_tail;
1424   preserve->section_count = abfd->section_count;
1425   preserve->section_htab = abfd->section_htab;
1426
1427   if (! bfd_hash_table_init (&abfd->section_htab, bfd_section_hash_newfunc))
1428     return FALSE;
1429
1430   abfd->tdata.any = NULL;
1431   abfd->arch_info = &bfd_default_arch_struct;
1432   abfd->flags &= BFD_IN_MEMORY;
1433   abfd->sections = NULL;
1434   abfd->section_tail = &abfd->sections;
1435   abfd->section_count = 0;
1436
1437   return TRUE;
1438 }
1439
1440 /*
1441 FUNCTION
1442         bfd_preserve_restore
1443
1444 SYNOPSIS
1445         void bfd_preserve_restore (bfd *, struct bfd_preserve *);
1446
1447 DESCRIPTION
1448         This function restores bfd state saved by bfd_preserve_save.
1449         If MARKER is non-NULL in struct bfd_preserve then that block
1450         and all subsequently bfd_alloc'd memory is freed.
1451
1452 */
1453
1454 void
1455 bfd_preserve_restore (bfd *abfd, struct bfd_preserve *preserve)
1456 {
1457   bfd_hash_table_free (&abfd->section_htab);
1458
1459   abfd->tdata.any = preserve->tdata;
1460   abfd->arch_info = preserve->arch_info;
1461   abfd->flags = preserve->flags;
1462   abfd->section_htab = preserve->section_htab;
1463   abfd->sections = preserve->sections;
1464   abfd->section_tail = preserve->section_tail;
1465   abfd->section_count = preserve->section_count;
1466
1467   /* bfd_release frees all memory more recently bfd_alloc'd than
1468      its arg, as well as its arg.  */
1469   if (preserve->marker != NULL)
1470     {
1471       bfd_release (abfd, preserve->marker);
1472       preserve->marker = NULL;
1473     }
1474 }
1475
1476 /*
1477 FUNCTION
1478         bfd_preserve_finish
1479
1480 SYNOPSIS
1481         void bfd_preserve_finish (bfd *, struct bfd_preserve *);
1482
1483 DESCRIPTION
1484         This function should be called when the bfd state saved by
1485         bfd_preserve_save is no longer needed.  ie. when the back-end
1486         object_p function returns with success.
1487
1488 */
1489
1490 void
1491 bfd_preserve_finish (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_preserve *preserve)
1492 {
1493   /* It would be nice to be able to free more memory here, eg. old
1494      tdata, but that's not possible since these blocks are sitting
1495      inside bfd_alloc'd memory.  The section hash is on a separate
1496      objalloc.  */
1497   bfd_hash_table_free (&preserve->section_htab);
1498 }