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 #include "inferior.h"
  36
  37 typedef bfd *bfdp;
  38 DEF_VEC_P (bfdp);
  39
  40 /* An object of this type is stored in the section's user data when
  41    mapping a section.  */
  42
  43 struct gdb_bfd_section_data
  44 {
  45   /* Size of the data.  */
  46   bfd_size_type size;
  47   /* If the data was mmapped, this is the length of the map.  */
  48   bfd_size_type map_len;
  49   /* The data.  If NULL, the section data has not been read.  */
  50   void *data;
  51   /* If the data was mmapped, this is the map address.  */
  52   void *map_addr;
  53 };
  54
  55 /* A hash table holding every BFD that gdb knows about.  This is not
  56    to be confused with 'gdb_bfd_cache', which is used for sharing
  57    BFDs; in contrast, this hash is used just to implement
  58    "maint info bfd".  */
  59
  60 static htab_t all_bfds;
  61
  62 /* An object of this type is stored in each BFD's user data.  */
  63
  64 struct gdb_bfd_data
  65 {
  66   /* The reference count.  */
  67   int refc;
  68
  69   /* The mtime of the BFD at the point the cache entry was made.  */
  70   time_t mtime;
  71
  72   /* This is true if we have determined whether this BFD has any
  73      sections requiring relocation.  */
  74   unsigned int relocation_computed : 1;
  75
  76   /* This is true if any section needs relocation.  */
  77   unsigned int needs_relocations : 1;
  78
  79   /* This is true if we have successfully computed the file's CRC.  */
  80   unsigned int crc_computed : 1;
  81
  82   /* The file's CRC.  */
  83   unsigned long crc;
  84
  85   /* If the BFD comes from an archive, this points to the archive's
  86      BFD.  Otherwise, this is NULL.  */
  87   bfd *archive_bfd;
  88
  89   /* Table of all the bfds this bfd has included.  */
  90   VEC (bfdp) *included_bfds;
  91
  92   /* The registry.  */
  93   REGISTRY_FIELDS;
  94 };
  95
  96 #define GDB_BFD_DATA_ACCESSOR(ABFD) \
  97   ((struct gdb_bfd_data *) bfd_usrdata (ABFD))
  98
  99 DEFINE_REGISTRY (bfd, GDB_BFD_DATA_ACCESSOR)
 100
 101 /* A hash table storing all the BFDs maintained in the cache.  */
 102
 103 static htab_t gdb_bfd_cache;
 104
 105 /* The type of an object being looked up in gdb_bfd_cache.  We use
 106    htab's capability of storing one kind of object (BFD in this case)
 107    and using a different sort of object for searching.  */
 108
 109 struct gdb_bfd_cache_search
 110 {
 111   /* The filename.  */
 112   const char *filename;
 113   /* The mtime.  */
 114   time_t mtime;
 115 };
 116
 117 /* A hash function for BFDs.  */
 118
 119 static hashval_t
 120 hash_bfd (const void *b)
 121 {
 122   const bfd *abfd = b;
 123
 124   /* It is simplest to just hash the filename.  */
 125   return htab_hash_string (bfd_get_filename (abfd));
 126 }
 127
 128 /* An equality function for BFDs.  Note that this expects the caller
 129    to search using struct gdb_bfd_cache_search only, not BFDs.  */
 130
 131 static int
 132 eq_bfd (const void *a, const void *b)
 133 {
 134   const bfd *abfd = a;
 135   const struct gdb_bfd_cache_search *s = b;
 136   struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
 137
 138   return (gdata->mtime == s->mtime
 139           && strcmp (bfd_get_filename (abfd), s->filename) == 0);
 140 }
 141
 142 /* See gdb_bfd.h.  */
 143
 144 int
 145 is_target_filename (const char *name)
 146 {
 147   return startswith (name, TARGET_SYSROOT_PREFIX);
 148 }
 149
 150 /* See gdb_bfd.h.  */
 151
 152 int
 153 gdb_bfd_has_target_filename (struct bfd *abfd)
 154 {
 155   return is_target_filename (bfd_get_filename (abfd));
 156 }
 157
 158
 159 /* Return the system error number corresponding to ERRNUM.  */
 160
 161 static int
 162 fileio_errno_to_host (int errnum)
 163 {
 164   switch (errnum)
 165     {
 166       case FILEIO_EPERM:
 167         return EPERM;
 168       case FILEIO_ENOENT:
 169         return ENOENT;
 170       case FILEIO_EINTR:
 171         return EINTR;
 172       case FILEIO_EIO:
 173         return EIO;
 174       case FILEIO_EBADF:
 175         return EBADF;
 176       case FILEIO_EACCES:
 177         return EACCES;
 178       case FILEIO_EFAULT:
 179         return EFAULT;
 180       case FILEIO_EBUSY:
 181         return EBUSY;
 182       case FILEIO_EEXIST:
 183         return EEXIST;
 184       case FILEIO_ENODEV:
 185         return ENODEV;
 186       case FILEIO_ENOTDIR:
 187         return ENOTDIR;
 188       case FILEIO_EISDIR:
 189         return EISDIR;
 190       case FILEIO_EINVAL:
 191         return EINVAL;
 192       case FILEIO_ENFILE:
 193         return ENFILE;
 194       case FILEIO_EMFILE:
 195         return EMFILE;
 196       case FILEIO_EFBIG:
 197         return EFBIG;
 198       case FILEIO_ENOSPC:
 199         return ENOSPC;
 200       case FILEIO_ESPIPE:
 201         return ESPIPE;
 202       case FILEIO_EROFS:
 203         return EROFS;
 204       case FILEIO_ENOSYS:
 205         return ENOSYS;
 206       case FILEIO_ENAMETOOLONG:
 207         return ENAMETOOLONG;
 208     }
 209   return -1;
 210 }
 211
 212 /* Wrapper for target_fileio_open suitable for passing as the
 213    OPEN_FUNC argument to gdb_bfd_openr_iovec.  The supplied
 214    OPEN_CLOSURE is unused.  */
 215
 216 static void *
 217 gdb_bfd_iovec_fileio_open (struct bfd *abfd, void *inferior)
 218 {
 219   const char *filename = bfd_get_filename (abfd);
 220   int fd, target_errno;
 221   int *stream;
 222
 223   gdb_assert (is_target_filename (filename));
 224
 225   fd = target_fileio_open ((struct inferior *) inferior,
 226                            filename + strlen (TARGET_SYSROOT_PREFIX),
 227                            FILEIO_O_RDONLY, 0,
 228                            &target_errno);
 229   if (fd == -1)
 230     {
 231       errno = fileio_errno_to_host (target_errno);
 232       bfd_set_error (bfd_error_system_call);
 233       return NULL;
 234     }
 235
 236   stream = XCNEW (int);
 237   *stream = fd;
 238   return stream;
 239 }
 240
 241 /* Wrapper for target_fileio_pread suitable for passing as the
 242    PREAD_FUNC argument to gdb_bfd_openr_iovec.  */
 243
 244 static file_ptr
 245 gdb_bfd_iovec_fileio_pread (struct bfd *abfd, void *stream, void *buf,
 246                             file_ptr nbytes, file_ptr offset)
 247 {
 248   int fd = *(int *) stream;
 249   int target_errno;
 250   file_ptr pos, bytes;
 251
 252   pos = 0;
 253   while (nbytes > pos)
 254     {
 255       bytes = target_fileio_pread (fd, (gdb_byte *) buf + pos,
 256                                    nbytes - pos, offset + pos,
 257                                    &target_errno);
 258       if (bytes == 0)
 259         /* Success, but no bytes, means end-of-file.  */
 260         break;
 261       if (bytes == -1)
 262         {
 263           errno = fileio_errno_to_host (target_errno);
 264           bfd_set_error (bfd_error_system_call);
 265           return -1;
 266         }
 267
 268       pos += bytes;
 269     }
 270
 271   return pos;
 272 }
 273
 274 /* Wrapper for target_fileio_close suitable for passing as the
 275    CLOSE_FUNC argument to gdb_bfd_openr_iovec.  */
 276
 277 static int
 278 gdb_bfd_iovec_fileio_close (struct bfd *abfd, void *stream)
 279 {
 280   int fd = *(int *) stream;
 281   int target_errno;
 282
 283   xfree (stream);
 284
 285   /* Ignore errors on close.  These may happen with remote
 286      targets if the connection has already been torn down.  */
 287   target_fileio_close (fd, &target_errno);
 288
 289   /* Zero means success.  */
 290   return 0;
 291 }
 292
 293 /* Wrapper for target_fileio_fstat suitable for passing as the
 294    STAT_FUNC argument to gdb_bfd_openr_iovec.  */
 295
 296 static int
 297 gdb_bfd_iovec_fileio_fstat (struct bfd *abfd, void *stream,
 298                             struct stat *sb)
 299 {
 300   int fd = *(int *) stream;
 301   int target_errno;
 302   int result;
 303
 304   result = target_fileio_fstat (fd, sb, &target_errno);
 305   if (result == -1)
 306     {
 307       errno = fileio_errno_to_host (target_errno);
 308       bfd_set_error (bfd_error_system_call);
 309     }
 310
 311   return result;
 312 }
 313
 314 /* See gdb_bfd.h.  */
 315
 316 struct bfd *
 317 gdb_bfd_open (const char *name, const char *target, int fd)
 318 {
 319   hashval_t hash;
 320   void **slot;
 321   bfd *abfd;
 322   struct gdb_bfd_cache_search search;
 323   struct stat st;
 324
 325   if (is_target_filename (name))
 326     {
 327       if (!target_filesystem_is_local ())
 328         {
 329           gdb_assert (fd == -1);
 330
 331           return gdb_bfd_openr_iovec (name, target,
 332                                       gdb_bfd_iovec_fileio_open,
 333                                       current_inferior (),
 334                                       gdb_bfd_iovec_fileio_pread,
 335                                       gdb_bfd_iovec_fileio_close,
 336                                       gdb_bfd_iovec_fileio_fstat);
 337         }
 338
 339       name += strlen (TARGET_SYSROOT_PREFIX);
 340     }
 341
 342   if (gdb_bfd_cache == NULL)
 343     gdb_bfd_cache = htab_create_alloc (1, hash_bfd, eq_bfd, NULL,
 344                                        xcalloc, xfree);
 345
 346   if (fd == -1)
 347     {
 348       fd = gdb_open_cloexec (name, O_RDONLY | O_BINARY, 0);
 349       if (fd == -1)
 350         {
 351           bfd_set_error (bfd_error_system_call);
 352           return NULL;
 353         }
 354     }
 355
 356   search.filename = name;
 357   if (fstat (fd, &st) < 0)
 358     {
 359       /* Weird situation here.  */
 360       search.mtime = 0;
 361     }
 362   else
 363     search.mtime = st.st_mtime;
 364
 365   /* Note that this must compute the same result as hash_bfd.  */
 366   hash = htab_hash_string (name);
 367   /* Note that we cannot use htab_find_slot_with_hash here, because
 368      opening the BFD may fail; and this would violate hashtab
 369      invariants.  */
 370   abfd = htab_find_with_hash (gdb_bfd_cache, &search, hash);
 371   if (abfd != NULL)
 372     {
 373       close (fd);
 374       gdb_bfd_ref (abfd);
 375       return abfd;
 376     }
 377
 378   abfd = bfd_fopen (name, target, FOPEN_RB, fd);
 379   if (abfd == NULL)
 380     return NULL;
 381
 382   slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash, INSERT);
 383   gdb_assert (!*slot);
 384   *slot = abfd;
 385
 386   gdb_bfd_ref (abfd);
 387   return abfd;
 388 }
 389
 390 /* A helper function that releases any section data attached to the
 391    BFD.  */
 392
 393 static void
 394 free_one_bfd_section (bfd *abfd, asection *sectp, void *ignore)
 395 {
 396   struct gdb_bfd_section_data *sect = bfd_get_section_userdata (abfd, sectp);
 397
 398   if (sect != NULL && sect->data != NULL)
 399     {
 400 #ifdef HAVE_MMAP
 401       if (sect->map_addr != NULL)
 402         {
 403           int res;
 404
 405           res = munmap (sect->map_addr, sect->map_len);
 406           gdb_assert (res == 0);
 407         }
 408       else
 409 #endif
 410         xfree (sect->data);
 411     }
 412 }
 413
 414 /* Close ABFD, and warn if that fails.  */
 415
 416 static int
 417 gdb_bfd_close_or_warn (struct bfd *abfd)
 418 {
 419   int ret;
 420   char *name = bfd_get_filename (abfd);
 421
 422   bfd_map_over_sections (abfd, free_one_bfd_section, NULL);
 423
 424   ret = bfd_close (abfd);
 425
 426   if (!ret)
 427     warning (_("cannot close \"%s\": %s"),
 428              name, bfd_errmsg (bfd_get_error ()));
 429
 430   return ret;
 431 }
 432
 433 /* See gdb_bfd.h.  */
 434
 435 void
 436 gdb_bfd_ref (struct bfd *abfd)
 437 {
 438   struct gdb_bfd_data *gdata;
 439   void **slot;
 440
 441   if (abfd == NULL)
 442     return;
 443
 444   gdata = bfd_usrdata (abfd);
 445
 446   if (gdata != NULL)
 447     {
 448       gdata->refc += 1;
 449       return;
 450     }
 451
 452   /* Ask BFD to decompress sections in bfd_get_full_section_contents.  */
 453   abfd->flags |= BFD_DECOMPRESS;
 454
 455   gdata = bfd_zalloc (abfd, sizeof (struct gdb_bfd_data));
 456   gdata->refc = 1;
 457   gdata->mtime = bfd_get_mtime (abfd);
 458   gdata->archive_bfd = NULL;
 459   bfd_usrdata (abfd) = gdata;
 460
 461   bfd_alloc_data (abfd);
 462
 463   /* This is the first we've seen it, so add it to the hash table.  */
 464   slot = htab_find_slot (all_bfds, abfd, INSERT);
 465   gdb_assert (slot && !*slot);
 466   *slot = abfd;
 467 }
 468
 469 /* See gdb_bfd.h.  */
 470
 471 void
 472 gdb_bfd_unref (struct bfd *abfd)
 473 {
 474   int ix;
 475   struct gdb_bfd_data *gdata;
 476   struct gdb_bfd_cache_search search;
 477   bfd *archive_bfd, *included_bfd;
 478
 479   if (abfd == NULL)
 480     return;
 481
 482   gdata = bfd_usrdata (abfd);
 483   gdb_assert (gdata->refc >= 1);
 484
 485   gdata->refc -= 1;
 486   if (gdata->refc > 0)
 487     return;
 488
 489   archive_bfd = gdata->archive_bfd;
 490   search.filename = bfd_get_filename (abfd);
 491
 492   if (gdb_bfd_cache && search.filename)
 493     {
 494       hashval_t hash = htab_hash_string (search.filename);
 495       void **slot;
 496
 497       search.mtime = gdata->mtime;
 498       slot = htab_find_slot_with_hash (gdb_bfd_cache, &search, hash,
 499                                        NO_INSERT);
 500
 501       if (slot && *slot)
 502         htab_clear_slot (gdb_bfd_cache, slot);
 503     }
 504
 505   for (ix = 0;
 506        VEC_iterate (bfdp, gdata->included_bfds, ix, included_bfd);
 507        ++ix)
 508     gdb_bfd_unref (included_bfd);
 509   VEC_free (bfdp, gdata->included_bfds);
 510
 511   bfd_free_data (abfd);
 512   bfd_usrdata (abfd) = NULL;  /* Paranoia.  */
 513
 514   htab_remove_elt (all_bfds, abfd);
 515
 516   gdb_bfd_close_or_warn (abfd);
 517
 518   gdb_bfd_unref (archive_bfd);
 519 }
 520
 521 /* A helper function that returns the section data descriptor
 522    associated with SECTION.  If no such descriptor exists, a new one
 523    is allocated and cleared.  */
 524
 525 static struct gdb_bfd_section_data *
 526 get_section_descriptor (asection *section)
 527 {
 528   struct gdb_bfd_section_data *result;
 529
 530   result = bfd_get_section_userdata (section->owner, section);
 531
 532   if (result == NULL)
 533     {
 534       result = bfd_zalloc (section->owner, sizeof (*result));
 535       bfd_set_section_userdata (section->owner, section, result);
 536     }
 537
 538   return result;
 539 }
 540
 541 /* See gdb_bfd.h.  */
 542
 543 const gdb_byte *
 544 gdb_bfd_map_section (asection *sectp, bfd_size_type *size)
 545 {
 546   bfd *abfd;
 547   struct gdb_bfd_section_data *descriptor;
 548   bfd_byte *data;
 549
 550   gdb_assert ((sectp->flags & SEC_RELOC) == 0);
 551   gdb_assert (size != NULL);
 552
 553   abfd = sectp->owner;
 554
 555   descriptor = get_section_descriptor (sectp);
 556
 557   /* If the data was already read for this BFD, just reuse it.  */
 558   if (descriptor->data != NULL)
 559     goto done;
 560
 561 #ifdef HAVE_MMAP
 562   if (!bfd_is_section_compressed (abfd, sectp))
 563     {
 564       /* The page size, used when mmapping.  */
 565       static int pagesize;
 566
 567       if (pagesize == 0)
 568         pagesize = getpagesize ();
 569
 570       /* Only try to mmap sections which are large enough: we don't want
 571          to waste space due to fragmentation.  */
 572
 573       if (bfd_get_section_size (sectp) > 4 * pagesize)
 574         {
 575           descriptor->size = bfd_get_section_size (sectp);
 576           descriptor->data = bfd_mmap (abfd, 0, descriptor->size, PROT_READ,
 577                                        MAP_PRIVATE, sectp->filepos,
 578                                        &descriptor->map_addr,
 579                                        &descriptor->map_len);
 580
 581           if ((caddr_t)descriptor->data != MAP_FAILED)
 582             {
 583 #if HAVE_POSIX_MADVISE
 584               posix_madvise (descriptor->map_addr, descriptor->map_len,
 585                              POSIX_MADV_WILLNEED);
 586 #endif
 587               goto done;
 588             }
 589
 590           /* On failure, clear out the section data and try again.  */
 591           memset (descriptor, 0, sizeof (*descriptor));
 592         }
 593     }
 594 #endif /* HAVE_MMAP */
 595
 596   /* Handle compressed sections, or ordinary uncompressed sections in
 597      the no-mmap case.  */
 598
 599   descriptor->size = bfd_get_section_size (sectp);
 600   descriptor->data = NULL;
 601
 602   data = NULL;
 603   if (!bfd_get_full_section_contents (abfd, sectp, &data))
 604     error (_("Can't read data for section '%s' in file '%s'"),
 605            bfd_get_section_name (abfd, sectp),
 606            bfd_get_filename (abfd));
 607   descriptor->data = data;
 608
 609  done:
 610   gdb_assert (descriptor->data != NULL);
 611   *size = descriptor->size;
 612   return descriptor->data;
 613 }
 614
 615 /* Return 32-bit CRC for ABFD.  If successful store it to *FILE_CRC_RETURN and
 616    return 1.  Otherwise print a warning and return 0.  ABFD seek position is
 617    not preserved.  */
 618
 619 static int
 620 get_file_crc (bfd *abfd, unsigned long *file_crc_return)
 621 {
 622   unsigned long file_crc = 0;
 623
 624   if (bfd_seek (abfd, 0, SEEK_SET) != 0)
 625     {
 626       warning (_("Problem reading \"%s\" for CRC: %s"),
 627                bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
 628       return 0;
 629     }
 630
 631   for (;;)
 632     {
 633       gdb_byte buffer[8 * 1024];
 634       bfd_size_type count;
 635
 636       count = bfd_bread (buffer, sizeof (buffer), abfd);
 637       if (count == (bfd_size_type) -1)
 638         {
 639           warning (_("Problem reading \"%s\" for CRC: %s"),
 640                    bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
 641           return 0;
 642         }
 643       if (count == 0)
 644         break;
 645       file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count);
 646     }
 647
 648   *file_crc_return = file_crc;
 649   return 1;
 650 }
 651
 652 /* See gdb_bfd.h.  */
 653
 654 int
 655 gdb_bfd_crc (struct bfd *abfd, unsigned long *crc_out)
 656 {
 657   struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
 658
 659   if (!gdata->crc_computed)
 660     gdata->crc_computed = get_file_crc (abfd, &gdata->crc);
 661
 662   if (gdata->crc_computed)
 663     *crc_out = gdata->crc;
 664   return gdata->crc_computed;
 665 }
 666
 667 \f
 668
 669 /* See gdb_bfd.h.  */
 670
 671 bfd *
 672 gdb_bfd_fopen (const char *filename, const char *target, const char *mode,
 673                int fd)
 674 {
 675   bfd *result = bfd_fopen (filename, target, mode, fd);
 676
 677   if (result)
 678     gdb_bfd_ref (result);
 679
 680   return result;
 681 }
 682
 683 /* See gdb_bfd.h.  */
 684
 685 bfd *
 686 gdb_bfd_openr (const char *filename, const char *target)
 687 {
 688   bfd *result = bfd_openr (filename, target);
 689
 690   if (result)
 691     gdb_bfd_ref (result);
 692
 693   return result;
 694 }
 695
 696 /* See gdb_bfd.h.  */
 697
 698 bfd *
 699 gdb_bfd_openw (const char *filename, const char *target)
 700 {
 701   bfd *result = bfd_openw (filename, target);
 702
 703   if (result)
 704     gdb_bfd_ref (result);
 705
 706   return result;
 707 }
 708
 709 /* See gdb_bfd.h.  */
 710
 711 bfd *
 712 gdb_bfd_openr_iovec (const char *filename, const char *target,
 713                      void *(*open_func) (struct bfd *nbfd,
 714                                          void *open_closure),
 715                      void *open_closure,
 716                      file_ptr (*pread_func) (struct bfd *nbfd,
 717                                              void *stream,
 718                                              void *buf,
 719                                              file_ptr nbytes,
 720                                              file_ptr offset),
 721                      int (*close_func) (struct bfd *nbfd,
 722                                         void *stream),
 723                      int (*stat_func) (struct bfd *abfd,
 724                                        void *stream,
 725                                        struct stat *sb))
 726 {
 727   bfd *result = bfd_openr_iovec (filename, target,
 728                                  open_func, open_closure,
 729                                  pread_func, close_func, stat_func);
 730
 731   if (result)
 732     gdb_bfd_ref (result);
 733
 734   return result;
 735 }
 736
 737 /* See gdb_bfd.h.  */
 738
 739 void
 740 gdb_bfd_mark_parent (bfd *child, bfd *parent)
 741 {
 742   struct gdb_bfd_data *gdata;
 743
 744   gdb_bfd_ref (child);
 745   /* No need to stash the filename here, because we also keep a
 746      reference on the parent archive.  */
 747
 748   gdata = bfd_usrdata (child);
 749   if (gdata->archive_bfd == NULL)
 750     {
 751       gdata->archive_bfd = parent;
 752       gdb_bfd_ref (parent);
 753     }
 754   else
 755     gdb_assert (gdata->archive_bfd == parent);
 756 }
 757
 758 /* See gdb_bfd.h.  */
 759
 760 bfd *
 761 gdb_bfd_openr_next_archived_file (bfd *archive, bfd *previous)
 762 {
 763   bfd *result = bfd_openr_next_archived_file (archive, previous);
 764
 765   if (result)
 766     gdb_bfd_mark_parent (result, archive);
 767
 768   return result;
 769 }
 770
 771 /* See gdb_bfd.h.  */
 772
 773 void
 774 gdb_bfd_record_inclusion (bfd *includer, bfd *includee)
 775 {
 776   struct gdb_bfd_data *gdata;
 777
 778   gdb_bfd_ref (includee);
 779   gdata = bfd_usrdata (includer);
 780   VEC_safe_push (bfdp, gdata->included_bfds, includee);
 781 }
 782
 783 /* See gdb_bfd.h.  */
 784
 785 bfd *
 786 gdb_bfd_fdopenr (const char *filename, const char *target, int fd)
 787 {
 788   bfd *result = bfd_fdopenr (filename, target, fd);
 789
 790   if (result)
 791     gdb_bfd_ref (result);
 792
 793   return result;
 794 }
 795
 796 \f
 797
 798 gdb_static_assert (ARRAY_SIZE (_bfd_std_section) == 4);
 799
 800 /* See gdb_bfd.h.  */
 801
 802 int
 803 gdb_bfd_section_index (bfd *abfd, asection *section)
 804 {
 805   if (section == NULL)
 806     return -1;
 807   else if (section == bfd_com_section_ptr)
 808     return bfd_count_sections (abfd);
 809   else if (section == bfd_und_section_ptr)
 810     return bfd_count_sections (abfd) + 1;
 811   else if (section == bfd_abs_section_ptr)
 812     return bfd_count_sections (abfd) + 2;
 813   else if (section == bfd_ind_section_ptr)
 814     return bfd_count_sections (abfd) + 3;
 815   return section->index;
 816 }
 817
 818 /* See gdb_bfd.h.  */
 819
 820 int
 821 gdb_bfd_count_sections (bfd *abfd)
 822 {
 823   return bfd_count_sections (abfd) + 4;
 824 }
 825
 826 /* See gdb_bfd.h.  */
 827
 828 int
 829 gdb_bfd_requires_relocations (bfd *abfd)
 830 {
 831   struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
 832
 833   if (gdata->relocation_computed == 0)
 834     {
 835       asection *sect;
 836
 837       for (sect = abfd->sections; sect != NULL; sect = sect->next)
 838         if ((sect->flags & SEC_RELOC) != 0)
 839           {
 840             gdata->needs_relocations = 1;
 841             break;
 842           }
 843
 844       gdata->relocation_computed = 1;
 845     }
 846
 847   return gdata->needs_relocations;
 848 }
 849
 850 \f
 851
 852 /* A callback for htab_traverse that prints a single BFD.  */
 853
 854 static int
 855 print_one_bfd (void **slot, void *data)
 856 {
 857   bfd *abfd = *slot;
 858   struct gdb_bfd_data *gdata = bfd_usrdata (abfd);
 859   struct ui_out *uiout = data;
 860   struct cleanup *inner;
 861
 862   inner = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 863   ui_out_field_int (uiout, "refcount", gdata->refc);
 864   ui_out_field_string (uiout, "addr", host_address_to_string (abfd));
 865   ui_out_field_string (uiout, "filename", bfd_get_filename (abfd));
 866   ui_out_text (uiout, "\n");
 867   do_cleanups (inner);
 868
 869   return 1;
 870 }
 871
 872 /* Implement the 'maint info bfd' command.  */
 873
 874 static void
 875 maintenance_info_bfds (char *arg, int from_tty)
 876 {
 877   struct cleanup *cleanup;
 878   struct ui_out *uiout = current_uiout;
 879
 880   cleanup = make_cleanup_ui_out_table_begin_end (uiout, 3, -1, "bfds");
 881   ui_out_table_header (uiout, 10, ui_left, "refcount", "Refcount");
 882   ui_out_table_header (uiout, 18, ui_left, "addr", "Address");
 883   ui_out_table_header (uiout, 40, ui_left, "filename", "Filename");
 884
 885   ui_out_table_body (uiout);
 886   htab_traverse (all_bfds, print_one_bfd, uiout);
 887
 888   do_cleanups (cleanup);
 889 }
 890
 891 /* -Wmissing-prototypes */
 892 extern initialize_file_ftype _initialize_gdb_bfd;
 893
 894 void
 895 _initialize_gdb_bfd (void)
 896 {
 897   all_bfds = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
 898                                 NULL, xcalloc, xfree);
 899
 900   add_cmd ("bfds", class_maintenance, maintenance_info_bfds, _("\
 901 List the BFDs that are currently open."),
 902            &maintenanceinfolist);
 903 }