gdb/gdb_bfd.c

   1 /* Definitions for BFD wrappers used by GDB.
   2
   3    Copyright (C) 2011-2015 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "gdb_bfd.h"
  22 #include "ui-out.h"
  23 #include "gdbcmd.h"
  24 #include "hashtab.h"
  25 #include "filestuff.h"
  26 #include "vec.h"
  27 #ifdef HAVE_MMAP
  28 #include <sys/mman.h>
  29 #ifndef MAP_FAILED
  30 #define MAP_FAILED ((void *) -1)
  31 #endif
  32 #endif
  33 #include "target.h"
  34 #include "gdb/fileio.h"
  35
  36 typedef bfd *bfdp;
  37 DEF_VEC_P (bfdp);
  38
  39 /* An object of this type is stored in the section's user data when
  40    mapping a section.  */
  41
  42 struct gdb_bfd_section_data
  43 {
  44   /* Size of the data.  */
  45   bfd_size_type size;
  46   /* If the data was mmapped, this is the length of the map.  */
  47   bfd_size_type map_len;
  48   /* The data.  If NULL, the section data has not been read.  */
  49   void *data;
  50   /* If the data was mmapped, this is the map address.  */
  51   void *map_addr;
  52 };
  53
  54 /* A hash table holding every BFD that gdb knows about.  This is not
  55    to be confused with 'gdb_bfd_cache', which is used for sharing
  56    BFDs; in contrast, this hash is used just to implement
  57    "maint info bfd".  */
  58
  59 static htab_t all_bfds;
  60
  61 /* An object of this type is stored in each BFD's user data.  */
  62
  63 struct gdb_bfd_data
  64 {
  65   /* The reference count.  */
  66   int refc;
  67
  68   /* The mtime of the BFD at the point the cache entry was made.  */
  69   time_t mtime;
  70
  71   /* This is true if we have determined whether this BFD has any
  72      sections requiring relocation.  */
  73   unsigned int relocation_computed : 1;
  74
  75   /* This is true if any section needs relocation.  */
  76   unsigned int needs_relocations : 1;
  77
  78   /* This is true if we have successfully computed the file's CRC.  */
  79   unsigned int crc_computed : 1;
  80
  81   /* The file's CRC.  */
  82   unsigned long crc;
  83
  84   /* If the BFD comes from an archive, this points to the archive's
  85      BFD.  Otherwise, this is NULL.  */
  86   bfd *archive_bfd;
  87
  88   /* Table of all the bfds this bfd has included.  */
  89   VEC (bfdp) *included_bfds;
  90
  91   /* The registry.  */
  92   REGISTRY_FIELDS;
  93 };
  94
  95 #define GDB_BFD_DATA_ACCESSOR(ABFD) \
  96   ((struct gdb_bfd_data *) bfd_usrdata (ABFD))
  97
  98 DEFINE_REGISTRY (bfd, GDB_BFD_DATA_ACCESSOR)
  99
 100 /* A hash table storing all the BFDs maintained in the cache.  */
 101
 102 static htab_t gdb_bfd_cache;
 103
 104 /* The type of an object being looked up in gdb_bfd_cache.  We use
 105    htab's capability of storing one kind of object (BFD in this case)
 106    and using a different sort of object for searching.  */
 107
 108 struct gdb_bfd_cache_search
 109 {
 110   /* The filename.  */
 111   const char *filename;
 112   /* The mtime.  */
 113   time_t mtime;
 114 };
 115
 116 /* A hash function for BFDs.  */
 117
 118 static hashval_t
 119 hash_bfd (const void *b)
 120 {
 121   const bfd *abfd = b;
 122
 123   /* It is simplest to just hash the filename.  */
 124   return htab_hash_string (bfd_get_filename (abfd));
 125 }
 126
 127 /* An equality function for BFDs.  Note that this expects the caller
 128    to search using struct gdb_bfd_cache_search only, not BFDs.  */
 129
 130 static int
 131 eq_bfd (const void *a, const void *b)
 132 {
 133   const bfd *abfd = a;
 134   const struct gdb_bfd_cache_search *s = b;
 135   struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
 136
 137   return (gdata->mtime == s->mtime
 138           && strcmp (bfd_get_filename (abfd), s->filename) == 0);
 139 }
 140
 141 /* See gdb_bfd.h.  */
 142
 143 int
 144 is_target_filename (const char *name)
 145 {
 146   return startswith (name, TARGET_SYSROOT_PREFIX);
 147 }
 148
 149 /* See gdb_bfd.h.  */
 150
 151 int
 152 gdb_bfd_has_target_filename (struct bfd *abfd)
 153 {
 154   return is_target_filename (bfd_get_filename (abfd));
 155 }
 156
 157
 158 /* Return the system error number corresponding to ERRNUM.  */
 159
 160 static int
 161 fileio_errno_to_host (int errnum)
 162 {
 163   switch (errnum)
 164     {
 165       case FILEIO_EPERM:
 166         return EPERM;
 167       case FILEIO_ENOENT:
 168         return ENOENT;
 169       case FILEIO_EINTR:
 170         return EINTR;
 171       case FILEIO_EIO:
 172         return EIO;
 173       case FILEIO_EBADF:
 174         return EBADF;
 175       case FILEIO_EACCES:
 176         return EACCES;
 177       case FILEIO_EFAULT:
 178         return EFAULT;
 179       case FILEIO_EBUSY:
 180         return EBUSY;
 181       case FILEIO_EEXIST:
 182         return EEXIST;
 183       case FILEIO_ENODEV:
 184         return ENODEV;
 185       case FILEIO_ENOTDIR:
 186         return ENOTDIR;
 187       case FILEIO_EISDIR:
 188         return EISDIR;
 189       case FILEIO_EINVAL:
 190         return EINVAL;
 191       case FILEIO_ENFILE:
 192         return ENFILE;
 193       case FILEIO_EMFILE:
 194         return EMFILE;
 195       case FILEIO_EFBIG:
 196         return EFBIG;
 197       case FILEIO_ENOSPC:
 198         return ENOSPC;
 199       case FILEIO_ESPIPE:
 200         return ESPIPE;
 201       case FILEIO_EROFS:
 202         return EROFS;
 203       case FILEIO_ENOSYS:
 204         return ENOSYS;
 205       case FILEIO_ENAMETOOLONG:
 206         return ENAMETOOLONG;
 207     }
 208   return -1;
 209 }
 210
 211 /* Wrapper for target_fileio_open suitable for passing as the
 212    OPEN_FUNC argument to gdb_bfd_openr_iovec.  The supplied
 213    OPEN_CLOSURE is unused.  */
 214
 215 static void *
 216 gdb_bfd_iovec_fileio_open (struct bfd *abfd, void *open_closure)
 217 {
 218   const char *filename = bfd_get_filename (abfd);
 219   int fd, target_errno;
 220   int *stream;
 221
 222   gdb_assert (is_target_filename (filename));
 223
 224   fd = target_fileio_open (filename + strlen (TARGET_SYSROOT_PREFIX),
 225                            FILEIO_O_RDONLY, 0,
 226                            &target_errno);
 227   if (fd == -1)
 228     {
 229       errno = fileio_errno_to_host (target_errno);
 230       bfd_set_error (bfd_error_system_call);
 231       return NULL;
 232     }
 233
 234   stream = XCNEW (int);
 235   *stream = fd;
 236   return stream;
 237 }
 238
 239 /* Wrapper for target_fileio_pread suitable for passing as the
 240    PREAD_FUNC argument to gdb_bfd_openr_iovec.  */
 241
 242 static file_ptr
 243 gdb_bfd_iovec_fileio_pread (struct bfd *abfd, void *stream, void *buf,
 244                             file_ptr nbytes, file_ptr offset)
 245 {
 246   int fd = *(int *) stream;
 247   int target_errno;
 248   file_ptr pos, bytes;
 249
 250   pos = 0;
 251   while (nbytes > pos)
 252     {
 253       bytes = target_fileio_pread (fd, (gdb_byte *) buf + pos,
 254                                    nbytes - pos, offset + pos,
 255                                    &target_errno);
 256       if (bytes == 0)
 257         /* Success, but no bytes, means end-of-file.  */
 258         break;
 259       if (bytes == -1)
 260         {
 261           errno = fileio_errno_to_host (target_errno);
 262           bfd_set_error (bfd_error_system_call);
 263           return -1;
 264         }
 265
 266       pos += bytes;
 267     }
 268
 269   return pos;
 270 }
 271
 272 /* Wrapper for target_fileio_close suitable for passing as the
 273    CLOSE_FUNC argument to gdb_bfd_openr_iovec.  */
 274
 275 static int
 276 gdb_bfd_iovec_fileio_close (struct bfd *abfd, void *stream)
 277 {
 278   int fd = *(int *) stream;
 279   int target_errno;
 280
 281   xfree (stream);
 282
 283   /* Ignore errors on close.  These may happen with remote
 284      targets if the connection has already been torn down.  */
 285   target_fileio_close (fd, &target_errno);
 286
 287   /* Zero means success.  */
 288   return 0;
 289 }
 290
 291 /* Wrapper for target_fileio_fstat suitable for passing as the
 292    STAT_FUNC argument to gdb_bfd_openr_iovec.  */
 293
 294 static int
 295 gdb_bfd_iovec_fileio_fstat (struct bfd *abfd, void *stream,
 296                             struct stat *sb)
 297 {
 298   int fd = *(int *) stream;
 299   int target_errno;
 300   int result;
 301
 302   result = target_fileio_fstat (fd, sb, &target_errno);
 303   if (result == -1)
 304     {
 305       errno = fileio_errno_to_host (target_errno);
 306       bfd_set_error (bfd_error_system_call);
 307     }
 308
 309   return result;
 310 }
 311
 312 /* See gdb_bfd.h.  */
 313
 314 struct bfd *
 315 gdb_bfd_open (const char *name, const char *target, int fd)
 316 {
 317   hashval_t hash;
 318   void **slot;
 319   bfd *abfd;
 320   struct gdb_bfd_cache_search search;
 321   struct stat st;
 322
 323   if (is_target_filename (name))
 324     {
 325       if (!target_filesystem_is_local ())
 326         {
 327           gdb_assert (fd == -1);
 328
 329           return gdb_bfd_openr_iovec (name, target,
 330                                       gdb_bfd_iovec_fileio_open, NULL,
 331                                       gdb_bfd_iovec_fileio_pread,
 332                                       gdb_bfd_iovec_fileio_close,
 333                                       gdb_bfd_iovec_fileio_fstat);
 334         }
 335
 336       name += strlen (TARGET_SYSROOT_PREFIX);
 337     }
 338
 339   if (gdb_bfd_cache == NULL)
 340     gdb_bfd_cache = htab_create_alloc (1, hash_bfd, eq_bfd, NULL,
 341                                        xcalloc, xfree);
 342
 343   if (fd == -1)
 344     {
 345       fd = gdb_open_cloexec (name, O_RDONLY | O_BINARY, 0);
 346       if (fd == -1)
 347         {
 348           bfd_set_error (bfd_error_system_call);
 349           return NULL;
 350         }
 351     }
 352
 353   search.filename = name;
 354   if (fstat (fd, &st) < 0)
 355     {
 356       /* Weird situation here.  */
 357       search.mtime = 0;
 358     }
 359   else
 360     search.mtime = st.st_mtime;
 361
 362   /* Note that this must compute the same result as hash_bfd.  */
 363   hash = htab_hash_string (name);
 364   /* Note that we cannot use htab_find_slot_with_hash here, because
 365      opening the BFD may fail; and this would violate hashtab
 366      invariants.  */
 367   abfd = htab_find_with_hash (gdb_bfd_cache, &search, hash);
 368   if (abfd != NULL)
 369     {
 370       close (fd);
 371       gdb_bfd_ref (abfd);
 372       return abfd;
 373     }
 374
 375   abfd = bfd_fopen (name, target, FOPEN_RB, fd);
 376   if (abfd == NULL)
 377     return NULL;
 378
 379   slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash, INSERT);
 380   gdb_assert (!*slot);
 381   *slot = abfd;
 382
 383   gdb_bfd_ref (abfd);
 384   return abfd;
 385 }
 386
 387 /* A helper function that releases any section data attached to the
 388    BFD.  */
 389
 390 static void
 391 free_one_bfd_section (bfd *abfd, asection *sectp, void *ignore)
 392 {
 393   struct gdb_bfd_section_data *sect = bfd_get_section_userdata (abfd, sectp);
 394
 395   if (sect != NULL && sect->data != NULL)
 396     {
 397 #ifdef HAVE_MMAP
 398       if (sect->map_addr != NULL)
 399         {
 400           int res;
 401
 402           res = munmap (sect->map_addr, sect->map_len);
 403           gdb_assert (res == 0);
 404         }
 405       else
 406 #endif
 407         xfree (sect->data);
 408     }
 409 }
 410
 411 /* Close ABFD, and warn if that fails.  */
 412
 413 static int
 414 gdb_bfd_close_or_warn (struct bfd *abfd)
 415 {
 416   int ret;
 417   char *name = bfd_get_filename (abfd);
 418
 419   bfd_map_over_sections (abfd, free_one_bfd_section, NULL);
 420
 421   ret = bfd_close (abfd);
 422
 423   if (!ret)
 424     warning (_("cannot close \"%s\": %s"),
 425              name, bfd_errmsg (bfd_get_error ()));
 426
 427   return ret;
 428 }
 429
 430 /* See gdb_bfd.h.  */
 431
 432 void
 433 gdb_bfd_ref (struct bfd *abfd)
 434 {
 435   struct gdb_bfd_data *gdata;
 436   void **slot;
 437
 438   if (abfd == NULL)
 439     return;
 440
 441   gdata = bfd_usrdata (abfd);
 442
 443   if (gdata != NULL)
 444     {
 445       gdata->refc += 1;
 446       return;
 447     }
 448
 449   /* Ask BFD to decompress sections in bfd_get_full_section_contents.  */
 450   abfd->flags |= BFD_DECOMPRESS;
 451
 452   gdata = bfd_zalloc (abfd, sizeof (struct gdb_bfd_data));
 453   gdata->refc = 1;
 454   gdata->mtime = bfd_get_mtime (abfd);
 455   gdata->archive_bfd = NULL;
 456   bfd_usrdata (abfd) = gdata;
 457
 458   bfd_alloc_data (abfd);
 459
 460   /* This is the first we've seen it, so add it to the hash table.  */
 461   slot = htab_find_slot (all_bfds, abfd, INSERT);
 462   gdb_assert (slot && !*slot);
 463   *slot = abfd;
 464 }
 465
 466 /* See gdb_bfd.h.  */
 467
 468 void
 469 gdb_bfd_unref (struct bfd *abfd)
 470 {
 471   int ix;
 472   struct gdb_bfd_data *gdata;
 473   struct gdb_bfd_cache_search search;
 474   bfd *archive_bfd, *included_bfd;
 475
 476   if (abfd == NULL)
 477     return;
 478
 479   gdata = bfd_usrdata (abfd);
 480   gdb_assert (gdata->refc >= 1);
 481
 482   gdata->refc -= 1;
 483   if (gdata->refc > 0)
 484     return;
 485
 486   archive_bfd = gdata->archive_bfd;
 487   search.filename = bfd_get_filename (abfd);
 488
 489   if (gdb_bfd_cache && search.filename)
 490     {
 491       hashval_t hash = htab_hash_string (search.filename);
 492       void **slot;
 493
 494       search.mtime = gdata->mtime;
 495       slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash,
 496                                        NO_INSERT);
 497
 498       if (slot && *slot)
 499         htab_clear_slot (gdb_bfd_cache, slot);
 500     }
 501
 502   for (ix = 0;
 503        VEC_iterate (bfdp, gdata->included_bfds, ix, included_bfd);
 504        ++ix)
 505     gdb_bfd_unref (included_bfd);
 506   VEC_free (bfdp, gdata->included_bfds);
 507
 508   bfd_free_data (abfd);
 509   bfd_usrdata (abfd) = NULL;  /* Paranoia.  */
 510
 511   htab_remove_elt (all_bfds, abfd);
 512
 513   gdb_bfd_close_or_warn (abfd);
 514
 515   gdb_bfd_unref (archive_bfd);
 516 }
 517
 518 /* A helper function that returns the section data descriptor
 519    associated with SECTION.  If no such descriptor exists, a new one
 520    is allocated and cleared.  */
 521
 522 static struct gdb_bfd_section_data *
 523 get_section_descriptor (asection *section)
 524 {
 525   struct gdb_bfd_section_data *result;
 526
 527   result = bfd_get_section_userdata (section->owner, section);
 528
 529   if (result == NULL)
 530     {
 531       result = bfd_zalloc (section->owner, sizeof (*result));
 532       bfd_set_section_userdata (section->owner, section, result);
 533     }
 534
 535   return result;
 536 }
 537
 538 /* See gdb_bfd.h.  */
 539
 540 const gdb_byte *
 541 gdb_bfd_map_section (asection *sectp, bfd_size_type *size)
 542 {
 543   bfd *abfd;
 544   struct gdb_bfd_section_data *descriptor;
 545   bfd_byte *data;
 546
 547   gdb_assert ((sectp->flags & SEC_RELOC) == 0);
 548   gdb_assert (size != NULL);
 549
 550   abfd = sectp->owner;
 551
 552   descriptor = get_section_descriptor (sectp);
 553
 554   /* If the data was already read for this BFD, just reuse it.  */
 555   if (descriptor->data != NULL)
 556     goto done;
 557
 558 #ifdef HAVE_MMAP
 559   if (!bfd_is_section_compressed (abfd, sectp))
 560     {
 561       /* The page size, used when mmapping.  */
 562       static int pagesize;
 563
 564       if (pagesize == 0)
 565         pagesize = getpagesize ();
 566
 567       /* Only try to mmap sections which are large enough: we don't want
 568          to waste space due to fragmentation.  */
 569
 570       if (bfd_get_section_size (sectp) > 4 * pagesize)
 571         {
 572           descriptor->size = bfd_get_section_size (sectp);
 573           descriptor->data = bfd_mmap (abfd, 0, descriptor->size, PROT_READ,
 574                                        MAP_PRIVATE, sectp->filepos,
 575                                        &descriptor->map_addr,
 576                                        &descriptor->map_len);
 577
 578           if ((caddr_t)descriptor->data != MAP_FAILED)
 579             {
 580 #if HAVE_POSIX_MADVISE
 581               posix_madvise (descriptor->map_addr, descriptor->map_len,
 582                              POSIX_MADV_WILLNEED);
 583 #endif
 584               goto done;
 585             }
 586
 587           /* On failure, clear out the section data and try again.  */
 588           memset (descriptor, 0, sizeof (*descriptor));
 589         }
 590     }
 591 #endif /* HAVE_MMAP */
 592
 593   /* Handle compressed sections, or ordinary uncompressed sections in
 594      the no-mmap case.  */
 595
 596   descriptor->size = bfd_get_section_size (sectp);
 597   descriptor->data = NULL;
 598
 599   data = NULL;
 600   if (!bfd_get_full_section_contents (abfd, sectp, &data))
 601     error (_("Can't read data for section '%s' in file '%s'"),
 602            bfd_get_section_name (abfd, sectp),
 603            bfd_get_filename (abfd));
 604   descriptor->data = data;
 605
 606  done:
 607   gdb_assert (descriptor->data != NULL);
 608   *size = descriptor->size;
 609   return descriptor->data;
 610 }
 611
 612 /* Return 32-bit CRC for ABFD.  If successful store it to *FILE_CRC_RETURN and
 613    return 1.  Otherwise print a warning and return 0.  ABFD seek position is
 614    not preserved.  */
 615
 616 static int
 617 get_file_crc (bfd *abfd, unsigned long *file_crc_return)
 618 {
 619   unsigned long file_crc = 0;
 620
 621   if (bfd_seek (abfd, 0, SEEK_SET) != 0)
 622     {
 623       warning (_("Problem reading \"%s\" for CRC: %s"),
 624                bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
 625       return 0;
 626     }
 627
 628   for (;;)
 629     {
 630       gdb_byte buffer[8 * 1024];
 631       bfd_size_type count;
 632
 633       count = bfd_bread (buffer, sizeof (buffer), abfd);
 634       if (count == (bfd_size_type) -1)
 635         {
 636           warning (_("Problem reading \"%s\" for CRC: %s"),
 637                    bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
 638           return 0;
 639         }
 640       if (count == 0)
 641         break;
 642       file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count);
 643     }
 644
 645   *file_crc_return = file_crc;
 646   return 1;
 647 }
 648
 649 /* See gdb_bfd.h.  */
 650
 651 int
 652 gdb_bfd_crc (struct bfd *abfd, unsigned long *crc_out)
 653 {
 654   struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
 655
 656   if (!gdata->crc_computed)
 657     gdata->crc_computed = get_file_crc (abfd, &gdata->crc);
 658
 659   if (gdata->crc_computed)
 660     *crc_out = gdata->crc;
 661   return gdata->crc_computed;
 662 }
 663
 664 \f
 665
 666 /* See gdb_bfd.h.  */
 667
 668 bfd *
 669 gdb_bfd_fopen (const char *filename, const char *target, const char *mode,
 670                int fd)
 671 {
 672   bfd *result = bfd_fopen (filename, target, mode, fd);
 673
 674   if (result)
 675     gdb_bfd_ref (result);
 676
 677   return result;
 678 }
 679
 680 /* See gdb_bfd.h.  */
 681
 682 bfd *
 683 gdb_bfd_openr (const char *filename, const char *target)
 684 {
 685   bfd *result = bfd_openr (filename, target);
 686
 687   if (result)
 688     gdb_bfd_ref (result);
 689
 690   return result;
 691 }
 692
 693 /* See gdb_bfd.h.  */
 694
 695 bfd *
 696 gdb_bfd_openw (const char *filename, const char *target)
 697 {
 698   bfd *result = bfd_openw (filename, target);
 699
 700   if (result)
 701     gdb_bfd_ref (result);
 702
 703   return result;
 704 }
 705
 706 /* See gdb_bfd.h.  */
 707
 708 bfd *
 709 gdb_bfd_openr_iovec (const char *filename, const char *target,
 710                      void *(*open_func) (struct bfd *nbfd,
 711                                          void *open_closure),
 712                      void *open_closure,
 713                      file_ptr (*pread_func) (struct bfd *nbfd,
 714                                              void *stream,
 715                                              void *buf,
 716                                              file_ptr nbytes,
 717                                              file_ptr offset),
 718                      int (*close_func) (struct bfd *nbfd,
 719                                         void *stream),
 720                      int (*stat_func) (struct bfd *abfd,
 721                                        void *stream,
 722                                        struct stat *sb))
 723 {
 724   bfd *result = bfd_openr_iovec (filename, target,
 725                                  open_func, open_closure,
 726                                  pread_func, close_func, stat_func);
 727
 728   if (result)
 729     gdb_bfd_ref (result);
 730
 731   return result;
 732 }
 733
 734 /* See gdb_bfd.h.  */
 735
 736 void
 737 gdb_bfd_mark_parent (bfd *child, bfd *parent)
 738 {
 739   struct gdb_bfd_data *gdata;
 740
 741   gdb_bfd_ref (child);
 742   /* No need to stash the filename here, because we also keep a
 743      reference on the parent archive.  */
 744
 745   gdata = bfd_usrdata (child);
 746   if (gdata->archive_bfd == NULL)
 747     {
 748       gdata->archive_bfd = parent;
 749       gdb_bfd_ref (parent);
 750     }
 751   else
 752     gdb_assert (gdata->archive_bfd == parent);
 753 }
 754
 755 /* See gdb_bfd.h.  */
 756
 757 bfd *
 758 gdb_bfd_openr_next_archived_file (bfd *archive, bfd *previous)
 759 {
 760   bfd *result = bfd_openr_next_archived_file (archive, previous);
 761
 762   if (result)
 763     gdb_bfd_mark_parent (result, archive);
 764
 765   return result;
 766 }
 767
 768 /* See gdb_bfd.h.  */
 769
 770 void
 771 gdb_bfd_record_inclusion (bfd *includer, bfd *includee)
 772 {
 773   struct gdb_bfd_data *gdata;
 774
 775   gdb_bfd_ref (includee);
 776   gdata = bfd_usrdata (includer);
 777   VEC_safe_push (bfdp, gdata->included_bfds, includee);
 778 }
 779
 780 /* See gdb_bfd.h.  */
 781
 782 bfd *
 783 gdb_bfd_fdopenr (const char *filename, const char *target, int fd)
 784 {
 785   bfd *result = bfd_fdopenr (filename, target, fd);
 786
 787   if (result)
 788     gdb_bfd_ref (result);
 789
 790   return result;
 791 }
 792
 793 \f
 794
 795 gdb_static_assert (ARRAY_SIZE (_bfd_std_section) == 4);
 796
 797 /* See gdb_bfd.h.  */
 798
 799 int
 800 gdb_bfd_section_index (bfd *abfd, asection *section)
 801 {
 802   if (section == NULL)
 803     return -1;
 804   else if (section == bfd_com_section_ptr)
 805     return bfd_count_sections (abfd);
 806   else if (section == bfd_und_section_ptr)
 807     return bfd_count_sections (abfd) + 1;
 808   else if (section == bfd_abs_section_ptr)
 809     return bfd_count_sections (abfd) + 2;
 810   else if (section == bfd_ind_section_ptr)
 811     return bfd_count_sections (abfd) + 3;
 812   return section->index;
 813 }
 814
 815 /* See gdb_bfd.h.  */
 816
 817 int
 818 gdb_bfd_count_sections (bfd *abfd)
 819 {
 820   return bfd_count_sections (abfd) + 4;
 821 }
 822
 823 /* See gdb_bfd.h.  */
 824
 825 int
 826 gdb_bfd_requires_relocations (bfd *abfd)
 827 {
 828   struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
 829
 830   if (gdata->relocation_computed == 0)
 831     {
 832       asection *sect;
 833
 834       for (sect = abfd->sections; sect != NULL; sect = sect->next)
 835         if ((sect->flags & SEC_RELOC) != 0)
 836           {
 837             gdata->needs_relocations = 1;
 838             break;
 839           }
 840
 841       gdata->relocation_computed = 1;
 842     }
 843
 844   return gdata->needs_relocations;
 845 }
 846
 847 \f
 848
 849 /* A callback for htab_traverse that prints a single BFD.  */
 850
 851 static int
 852 print_one_bfd (void **slot, void *data)
 853 {
 854   bfd *abfd = *slot;
 855   struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
 856   struct ui_out *uiout = data;
 857   struct cleanup *inner;
 858
 859   inner = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 860   ui_out_field_int (uiout, "refcount", gdata->refc);
 861   ui_out_field_string (uiout, "addr", host_address_to_string (abfd));
 862   ui_out_field_string (uiout, "filename", bfd_get_filename (abfd));
 863   ui_out_text (uiout, "\n");
 864   do_cleanups (inner);
 865
 866   return 1;
 867 }
 868
 869 /* Implement the 'maint info bfd' command.  */
 870
 871 static void
 872 maintenance_info_bfds (char *arg, int from_tty)
 873 {
 874   struct cleanup *cleanup;
 875   struct ui_out *uiout = current_uiout;
 876
 877   cleanup = make_cleanup_ui_out_table_begin_end (uiout, 3, -1, "bfds");
 878   ui_out_table_header (uiout, 10, ui_left, "refcount", "Refcount");
 879   ui_out_table_header (uiout, 18, ui_left, "addr", "Address");
 880   ui_out_table_header (uiout, 40, ui_left, "filename", "Filename");
 881
 882   ui_out_table_body (uiout);
 883   htab_traverse (all_bfds, print_one_bfd, uiout);
 884
 885   do_cleanups (cleanup);
 886 }
 887
 888 /* -Wmissing-prototypes */
 889 extern initialize_file_ftype _initialize_gdb_bfd;
 890
 891 void
 892 _initialize_gdb_bfd (void)
 893 {
 894   all_bfds = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
 895                                 NULL, xcalloc, xfree);
 896
 897   add_cmd ("bfds", class_maintenance, maintenance_info_bfds, _("\
 898 List the BFDs that are currently open."),
 899            &maintenanceinfolist);
 900 }