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  1. /* opncls.c -- open and close a BFD.
  2.    Copyright 1990-2013 Free Software Foundation, Inc.
  3.  
  4.    Written by Cygnus Support.
  5.  
  6.    This file is part of BFD, the Binary File Descriptor library.
  7.  
  8.    This program is free software; you can redistribute it and/or modify
  9.    it under the terms of the GNU General Public License as published by
  10.    the Free Software Foundation; either version 3 of the License, or
  11.    (at your option) any later version.
  12.  
  13.    This program is distributed in the hope that it will be useful,
  14.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16.    GNU General Public License for more details.
  17.  
  18.    You should have received a copy of the GNU General Public License
  19.    along with this program; if not, write to the Free Software
  20.    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21.    MA 02110-1301, USA.  */
  22.  
  23. #include "sysdep.h"
  24. #include "bfd.h"
  25. #include "objalloc.h"
  26. #include "libbfd.h"
  27. #include "libiberty.h"
  28.  
  29. #ifndef S_IXUSR
  30. #define S_IXUSR 0100    /* Execute by owner.  */
  31. #endif
  32. #ifndef S_IXGRP
  33. #define S_IXGRP 0010    /* Execute by group.  */
  34. #endif
  35. #ifndef S_IXOTH
  36. #define S_IXOTH 0001    /* Execute by others.  */
  37. #endif
  38.  
  39. /* Counters used to initialize the bfd identifier.  */
  40.  
  41. static unsigned int bfd_id_counter = 0;
  42. static unsigned int bfd_reserved_id_counter = 0;
  43.  
  44. /*
  45. CODE_FRAGMENT
  46. .{* Set to N to open the next N BFDs using an alternate id space.  *}
  47. .extern unsigned int bfd_use_reserved_id;
  48. */
  49. unsigned int bfd_use_reserved_id = 0;
  50.  
  51. /* fdopen is a loser -- we should use stdio exclusively.  Unfortunately
  52.    if we do that we can't use fcntl.  */
  53.  
  54. /* Return a new BFD.  All BFD's are allocated through this routine.  */
  55.  
  56. bfd *
  57. _bfd_new_bfd (void)
  58. {
  59.   bfd *nbfd;
  60.  
  61.   nbfd = (bfd *) bfd_zmalloc (sizeof (bfd));
  62.   if (nbfd == NULL)
  63.     return NULL;
  64.  
  65.   if (bfd_use_reserved_id)
  66.     {
  67.       nbfd->id = --bfd_reserved_id_counter;
  68.       --bfd_use_reserved_id;
  69.     }
  70.   else
  71.     nbfd->id = bfd_id_counter++;
  72.  
  73.   nbfd->memory = objalloc_create ();
  74.   if (nbfd->memory == NULL)
  75.     {
  76.       bfd_set_error (bfd_error_no_memory);
  77.       free (nbfd);
  78.       return NULL;
  79.     }
  80.  
  81.   nbfd->arch_info = &bfd_default_arch_struct;
  82.  
  83.   nbfd->direction = no_direction;
  84.   nbfd->iostream = NULL;
  85.   nbfd->where = 0;
  86.   if (!bfd_hash_table_init_n (& nbfd->section_htab, bfd_section_hash_newfunc,
  87.                               sizeof (struct section_hash_entry), 13))
  88.     {
  89.       free (nbfd);
  90.       return NULL;
  91.     }
  92.   nbfd->sections = NULL;
  93.   nbfd->section_last = NULL;
  94.   nbfd->format = bfd_unknown;
  95.   nbfd->my_archive = NULL;
  96.   nbfd->origin = 0;
  97.   nbfd->opened_once = FALSE;
  98.   nbfd->output_has_begun = FALSE;
  99.   nbfd->section_count = 0;
  100.   nbfd->usrdata = NULL;
  101.   nbfd->cacheable = FALSE;
  102.   nbfd->flags = BFD_NO_FLAGS;
  103.   nbfd->mtime_set = FALSE;
  104.  
  105.   return nbfd;
  106. }
  107.  
  108. static const struct bfd_iovec opncls_iovec;
  109.  
  110. /* Allocate a new BFD as a member of archive OBFD.  */
  111.  
  112. bfd *
  113. _bfd_new_bfd_contained_in (bfd *obfd)
  114. {
  115.   bfd *nbfd;
  116.  
  117.   nbfd = _bfd_new_bfd ();
  118.   if (nbfd == NULL)
  119.     return NULL;
  120.   nbfd->xvec = obfd->xvec;
  121.   nbfd->iovec = obfd->iovec;
  122.   if (obfd->iovec == &opncls_iovec)
  123.     nbfd->iostream = obfd->iostream;
  124.   nbfd->my_archive = obfd;
  125.   nbfd->direction = read_direction;
  126.   nbfd->target_defaulted = obfd->target_defaulted;
  127.   return nbfd;
  128. }
  129.  
  130. /* Delete a BFD.  */
  131.  
  132. static void
  133. _bfd_delete_bfd (bfd *abfd)
  134. {
  135.   if (abfd->memory)
  136.     {
  137.       bfd_hash_table_free (&abfd->section_htab);
  138.       objalloc_free ((struct objalloc *) abfd->memory);
  139.     }
  140.  
  141.   free (abfd->arelt_data);
  142.   free (abfd);
  143. }
  144.  
  145. /* Free objalloc memory.  */
  146.  
  147. bfd_boolean
  148. _bfd_free_cached_info (bfd *abfd)
  149. {
  150.   if (abfd->memory)
  151.     {
  152.       bfd_hash_table_free (&abfd->section_htab);
  153.       objalloc_free ((struct objalloc *) abfd->memory);
  154.  
  155.       abfd->sections = NULL;
  156.       abfd->section_last = NULL;
  157.       abfd->outsymbols = NULL;
  158.       abfd->tdata.any = NULL;
  159.       abfd->usrdata = NULL;
  160.       abfd->memory = NULL;
  161.     }
  162.  
  163.   return TRUE;
  164. }
  165.  
  166. /*
  167. SECTION
  168.         Opening and closing BFDs
  169.  
  170. SUBSECTION
  171.         Functions for opening and closing
  172. */
  173.  
  174. /*
  175. FUNCTION
  176.         bfd_fopen
  177.  
  178. SYNOPSIS
  179.         bfd *bfd_fopen (const char *filename, const char *target,
  180.                         const char *mode, int fd);
  181.  
  182. DESCRIPTION
  183.         Open the file @var{filename} with the target @var{target}.
  184.         Return a pointer to the created BFD.  If @var{fd} is not -1,
  185.         then <<fdopen>> is used to open the file; otherwise, <<fopen>>
  186.         is used.  @var{mode} is passed directly to <<fopen>> or
  187.         <<fdopen>>.
  188.  
  189.         Calls <<bfd_find_target>>, so @var{target} is interpreted as by
  190.         that function.
  191.  
  192.         The new BFD is marked as cacheable iff @var{fd} is -1.
  193.  
  194.         If <<NULL>> is returned then an error has occured.   Possible errors
  195.         are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or
  196.         <<system_call>> error.
  197.  
  198.         On error, @var{fd} is always closed.
  199. */
  200.  
  201. bfd *
  202. bfd_fopen (const char *filename, const char *target, const char *mode, int fd)
  203. {
  204.   bfd *nbfd;
  205.   const bfd_target *target_vec;
  206.  
  207.   nbfd = _bfd_new_bfd ();
  208.   if (nbfd == NULL)
  209.     {
  210.       if (fd != -1)
  211.         close (fd);
  212.       return NULL;
  213.     }
  214.  
  215.   target_vec = bfd_find_target (target, nbfd);
  216.   if (target_vec == NULL)
  217.     {
  218.       if (fd != -1)
  219.         close (fd);
  220.       _bfd_delete_bfd (nbfd);
  221.       return NULL;
  222.     }
  223.  
  224. #ifdef HAVE_FDOPEN
  225.   if (fd != -1)
  226.     nbfd->iostream = fdopen (fd, mode);
  227.   else
  228. #endif
  229.     nbfd->iostream = real_fopen (filename, mode);
  230.   if (nbfd->iostream == NULL)
  231.     {
  232.       bfd_set_error (bfd_error_system_call);
  233.       _bfd_delete_bfd (nbfd);
  234.       return NULL;
  235.     }
  236.  
  237.   /* OK, put everything where it belongs.  */
  238.   nbfd->filename = filename;
  239.  
  240.   /* Figure out whether the user is opening the file for reading,
  241.      writing, or both, by looking at the MODE argument.  */
  242.   if ((mode[0] == 'r' || mode[0] == 'w' || mode[0] == 'a')
  243.       && mode[1] == '+')
  244.     nbfd->direction = both_direction;
  245.   else if (mode[0] == 'r')
  246.     nbfd->direction = read_direction;
  247.   else
  248.     nbfd->direction = write_direction;
  249.  
  250.   if (! bfd_cache_init (nbfd))
  251.     {
  252.       _bfd_delete_bfd (nbfd);
  253.       return NULL;
  254.     }
  255.   nbfd->opened_once = TRUE;
  256.  
  257.   /* If we opened the file by name, mark it cacheable; we can close it
  258.      and reopen it later.  However, if a file descriptor was provided,
  259.      then it may have been opened with special flags that make it
  260.      unsafe to close and reopen the file.  */
  261.   if (fd == -1)
  262.     (void) bfd_set_cacheable (nbfd, TRUE);
  263.  
  264.   return nbfd;
  265. }
  266.  
  267. /*
  268. FUNCTION
  269.         bfd_openr
  270.  
  271. SYNOPSIS
  272.         bfd *bfd_openr (const char *filename, const char *target);
  273.  
  274. DESCRIPTION
  275.         Open the file @var{filename} (using <<fopen>>) with the target
  276.         @var{target}.  Return a pointer to the created BFD.
  277.  
  278.         Calls <<bfd_find_target>>, so @var{target} is interpreted as by
  279.         that function.
  280.  
  281.         If <<NULL>> is returned then an error has occured.   Possible errors
  282.         are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or
  283.         <<system_call>> error.
  284. */
  285.  
  286. bfd *
  287. bfd_openr (const char *filename, const char *target)
  288. {
  289.   return bfd_fopen (filename, target, FOPEN_RB, -1);
  290. }
  291.  
  292. /* Don't try to `optimize' this function:
  293.  
  294.    o - We lock using stack space so that interrupting the locking
  295.        won't cause a storage leak.
  296.    o - We open the file stream last, since we don't want to have to
  297.        close it if anything goes wrong.  Closing the stream means closing
  298.        the file descriptor too, even though we didn't open it.  */
  299. /*
  300. FUNCTION
  301.         bfd_fdopenr
  302.  
  303. SYNOPSIS
  304.         bfd *bfd_fdopenr (const char *filename, const char *target, int fd);
  305.  
  306. DESCRIPTION
  307.         <<bfd_fdopenr>> is to <<bfd_fopenr>> much like <<fdopen>> is to
  308.         <<fopen>>.  It opens a BFD on a file already described by the
  309.         @var{fd} supplied.
  310.  
  311.         When the file is later <<bfd_close>>d, the file descriptor will
  312.         be closed.  If the caller desires that this file descriptor be
  313.         cached by BFD (opened as needed, closed as needed to free
  314.         descriptors for other opens), with the supplied @var{fd} used as
  315.         an initial file descriptor (but subject to closure at any time),
  316.         call bfd_set_cacheable(bfd, 1) on the returned BFD.  The default
  317.         is to assume no caching; the file descriptor will remain open
  318.         until <<bfd_close>>, and will not be affected by BFD operations
  319.         on other files.
  320.  
  321.         Possible errors are <<bfd_error_no_memory>>,
  322.         <<bfd_error_invalid_target>> and <<bfd_error_system_call>>.
  323.  
  324.         On error, @var{fd} is closed.
  325. */
  326.  
  327. bfd *
  328. bfd_fdopenr (const char *filename, const char *target, int fd)
  329. {
  330.   const char *mode;
  331. #if defined(HAVE_FCNTL) && defined(F_GETFL)
  332.   int fdflags;
  333. #endif
  334.  
  335. #if ! defined(HAVE_FCNTL) || ! defined(F_GETFL)
  336.   mode = FOPEN_RUB; /* Assume full access.  */
  337. #else
  338.   fdflags = fcntl (fd, F_GETFL, NULL);
  339.   if (fdflags == -1)
  340.     {
  341.       int save = errno;
  342.  
  343.       close (fd);
  344.       errno = save;
  345.       bfd_set_error (bfd_error_system_call);
  346.       return NULL;
  347.     }
  348.  
  349.   /* (O_ACCMODE) parens are to avoid Ultrix header file bug.  */
  350.   switch (fdflags & (O_ACCMODE))
  351.     {
  352.     case O_RDONLY: mode = FOPEN_RB; break;
  353.     case O_WRONLY: mode = FOPEN_RUB; break;
  354.     case O_RDWR:   mode = FOPEN_RUB; break;
  355.     default: abort ();
  356.     }
  357. #endif
  358.  
  359.   return bfd_fopen (filename, target, mode, fd);
  360. }
  361.  
  362. /*
  363. FUNCTION
  364.         bfd_openstreamr
  365.  
  366. SYNOPSIS
  367.         bfd *bfd_openstreamr (const char *, const char *, void *);
  368.  
  369. DESCRIPTION
  370.  
  371.         Open a BFD for read access on an existing stdio stream.  When
  372.         the BFD is passed to <<bfd_close>>, the stream will be closed.
  373. */
  374.  
  375. bfd *
  376. bfd_openstreamr (const char *filename, const char *target, void *streamarg)
  377. {
  378.   FILE *stream = (FILE *) streamarg;
  379.   bfd *nbfd;
  380.   const bfd_target *target_vec;
  381.  
  382.   nbfd = _bfd_new_bfd ();
  383.   if (nbfd == NULL)
  384.     return NULL;
  385.  
  386.   target_vec = bfd_find_target (target, nbfd);
  387.   if (target_vec == NULL)
  388.     {
  389.       _bfd_delete_bfd (nbfd);
  390.       return NULL;
  391.     }
  392.  
  393.   nbfd->iostream = stream;
  394.   nbfd->filename = filename;
  395.   nbfd->direction = read_direction;
  396.  
  397.   if (! bfd_cache_init (nbfd))
  398.     {
  399.       _bfd_delete_bfd (nbfd);
  400.       return NULL;
  401.     }
  402.  
  403.   return nbfd;
  404. }
  405.  
  406. /*
  407. FUNCTION
  408.         bfd_openr_iovec
  409.  
  410. SYNOPSIS
  411.         bfd *bfd_openr_iovec (const char *filename, const char *target,
  412.                               void *(*open_func) (struct bfd *nbfd,
  413.                                                   void *open_closure),
  414.                               void *open_closure,
  415.                               file_ptr (*pread_func) (struct bfd *nbfd,
  416.                                                       void *stream,
  417.                                                       void *buf,
  418.                                                       file_ptr nbytes,
  419.                                                       file_ptr offset),
  420.                               int (*close_func) (struct bfd *nbfd,
  421.                                                  void *stream),
  422.                               int (*stat_func) (struct bfd *abfd,
  423.                                                 void *stream,
  424.                                                 struct stat *sb));
  425.  
  426. DESCRIPTION
  427.  
  428.         Create and return a BFD backed by a read-only @var{stream}.
  429.         The @var{stream} is created using @var{open_func}, accessed using
  430.         @var{pread_func} and destroyed using @var{close_func}.
  431.  
  432.         Calls <<bfd_find_target>>, so @var{target} is interpreted as by
  433.         that function.
  434.  
  435.         Calls @var{open_func} (which can call <<bfd_zalloc>> and
  436.         <<bfd_get_filename>>) to obtain the read-only stream backing
  437.         the BFD.  @var{open_func} either succeeds returning the
  438.         non-<<NULL>> @var{stream}, or fails returning <<NULL>>
  439.         (setting <<bfd_error>>).
  440.  
  441.         Calls @var{pread_func} to request @var{nbytes} of data from
  442.         @var{stream} starting at @var{offset} (e.g., via a call to
  443.         <<bfd_read>>).  @var{pread_func} either succeeds returning the
  444.         number of bytes read (which can be less than @var{nbytes} when
  445.         end-of-file), or fails returning -1 (setting <<bfd_error>>).
  446.  
  447.         Calls @var{close_func} when the BFD is later closed using
  448.         <<bfd_close>>.  @var{close_func} either succeeds returning 0, or
  449.         fails returning -1 (setting <<bfd_error>>).
  450.  
  451.         Calls @var{stat_func} to fill in a stat structure for bfd_stat,
  452.         bfd_get_size, and bfd_get_mtime calls.  @var{stat_func} returns 0
  453.         on success, or returns -1 on failure (setting <<bfd_error>>).
  454.  
  455.         If <<bfd_openr_iovec>> returns <<NULL>> then an error has
  456.         occurred.  Possible errors are <<bfd_error_no_memory>>,
  457.         <<bfd_error_invalid_target>> and <<bfd_error_system_call>>.
  458.  
  459. */
  460.  
  461. struct opncls
  462. {
  463.   void *stream;
  464.   file_ptr (*pread) (struct bfd *abfd, void *stream, void *buf,
  465.                      file_ptr nbytes, file_ptr offset);
  466.   int (*close) (struct bfd *abfd, void *stream);
  467.   int (*stat) (struct bfd *abfd, void *stream, struct stat *sb);
  468.   file_ptr where;
  469. };
  470.  
  471. static file_ptr
  472. opncls_btell (struct bfd *abfd)
  473. {
  474.   struct opncls *vec = (struct opncls *) abfd->iostream;
  475.   return vec->where;
  476. }
  477.  
  478. static int
  479. opncls_bseek (struct bfd *abfd, file_ptr offset, int whence)
  480. {
  481.   struct opncls *vec = (struct opncls *) abfd->iostream;
  482.   switch (whence)
  483.     {
  484.     case SEEK_SET: vec->where = offset; break;
  485.     case SEEK_CUR: vec->where += offset; break;
  486.     case SEEK_END: return -1;
  487.     }
  488.   return 0;
  489. }
  490.  
  491. static file_ptr
  492. opncls_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
  493. {
  494.   struct opncls *vec = (struct opncls *) abfd->iostream;
  495.   file_ptr nread = (vec->pread) (abfd, vec->stream, buf, nbytes, vec->where);
  496.   if (nread < 0)
  497.     return nread;
  498.   vec->where += nread;
  499.   return nread;
  500. }
  501.  
  502. static file_ptr
  503. opncls_bwrite (struct bfd *abfd ATTRIBUTE_UNUSED,
  504.               const void *where ATTRIBUTE_UNUSED,
  505.               file_ptr nbytes ATTRIBUTE_UNUSED)
  506. {
  507.   return -1;
  508. }
  509.  
  510. static int
  511. opncls_bclose (struct bfd *abfd)
  512. {
  513.   struct opncls *vec = (struct opncls *) abfd->iostream;
  514.   /* Since the VEC's memory is bound to the bfd deleting the bfd will
  515.      free it.  */
  516.   int status = 0;
  517.   if (vec->close != NULL)
  518.     status = (vec->close) (abfd, vec->stream);
  519.   abfd->iostream = NULL;
  520.   return status;
  521. }
  522.  
  523. static int
  524. opncls_bflush (struct bfd *abfd ATTRIBUTE_UNUSED)
  525. {
  526.   return 0;
  527. }
  528.  
  529. static int
  530. opncls_bstat (struct bfd *abfd, struct stat *sb)
  531. {
  532.   struct opncls *vec = (struct opncls *) abfd->iostream;
  533.  
  534.   memset (sb, 0, sizeof (*sb));
  535.   if (vec->stat == NULL)
  536.     return 0;
  537.  
  538.   return (vec->stat) (abfd, vec->stream, sb);
  539. }
  540.  
  541. static void *
  542. opncls_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED,
  543.               void *addr ATTRIBUTE_UNUSED,
  544.               bfd_size_type len ATTRIBUTE_UNUSED,
  545.               int prot ATTRIBUTE_UNUSED,
  546.               int flags ATTRIBUTE_UNUSED,
  547.               file_ptr offset ATTRIBUTE_UNUSED,
  548.               void **map_addr ATTRIBUTE_UNUSED,
  549.               bfd_size_type *map_len ATTRIBUTE_UNUSED)
  550. {
  551.   return (void *) -1;
  552. }
  553.  
  554. static const struct bfd_iovec opncls_iovec = {
  555.   &opncls_bread, &opncls_bwrite, &opncls_btell, &opncls_bseek,
  556.   &opncls_bclose, &opncls_bflush, &opncls_bstat, &opncls_bmmap
  557. };
  558.  
  559. bfd *
  560. bfd_openr_iovec (const char *filename, const char *target,
  561.                  void *(*open_p) (struct bfd *, void *),
  562.                  void *open_closure,
  563.                  file_ptr (*pread_p) (struct bfd *, void *, void *,
  564.                                       file_ptr, file_ptr),
  565.                  int (*close_p) (struct bfd *, void *),
  566.                  int (*stat_p) (struct bfd *, void *, struct stat *))
  567. {
  568.   bfd *nbfd;
  569.   const bfd_target *target_vec;
  570.   struct opncls *vec;
  571.   void *stream;
  572.  
  573.   nbfd = _bfd_new_bfd ();
  574.   if (nbfd == NULL)
  575.     return NULL;
  576.  
  577.   target_vec = bfd_find_target (target, nbfd);
  578.   if (target_vec == NULL)
  579.     {
  580.       _bfd_delete_bfd (nbfd);
  581.       return NULL;
  582.     }
  583.  
  584.   nbfd->filename = filename;
  585.   nbfd->direction = read_direction;
  586.  
  587.   /* `open_p (...)' would get expanded by an the open(2) syscall macro.  */
  588.   stream = (*open_p) (nbfd, open_closure);
  589.   if (stream == NULL)
  590.     {
  591.       _bfd_delete_bfd (nbfd);
  592.       return NULL;
  593.     }
  594.  
  595.   vec = (struct opncls *) bfd_zalloc (nbfd, sizeof (struct opncls));
  596.   vec->stream = stream;
  597.   vec->pread = pread_p;
  598.   vec->close = close_p;
  599.   vec->stat = stat_p;
  600.  
  601.   nbfd->iovec = &opncls_iovec;
  602.   nbfd->iostream = vec;
  603.  
  604.   return nbfd;
  605. }
  607. /* bfd_openw -- open for writing.
  608.    Returns a pointer to a freshly-allocated BFD on success, or NULL.
  609.  
  610.    See comment by bfd_fdopenr before you try to modify this function.  */
  611.  
  612. /*
  613. FUNCTION
  614.         bfd_openw
  615.  
  616. SYNOPSIS
  617.         bfd *bfd_openw (const char *filename, const char *target);
  618.  
  619. DESCRIPTION
  620.         Create a BFD, associated with file @var{filename}, using the
  621.         file format @var{target}, and return a pointer to it.
  622.  
  623.         Possible errors are <<bfd_error_system_call>>, <<bfd_error_no_memory>>,
  624.         <<bfd_error_invalid_target>>.
  625. */
  626.  
  627. bfd *
  628. bfd_openw (const char *filename, const char *target)
  629. {
  630.   bfd *nbfd;
  631.   const bfd_target *target_vec;
  632.  
  633.   /* nbfd has to point to head of malloc'ed block so that bfd_close may
  634.      reclaim it correctly.  */
  635.   nbfd = _bfd_new_bfd ();
  636.   if (nbfd == NULL)
  637.     return NULL;
  638.  
  639.   target_vec = bfd_find_target (target, nbfd);
  640.   if (target_vec == NULL)
  641.     {
  642.       _bfd_delete_bfd (nbfd);
  643.       return NULL;
  644.     }
  645.  
  646.   nbfd->filename = filename;
  647.   nbfd->direction = write_direction;
  648.  
  649.   if (bfd_open_file (nbfd) == NULL)
  650.     {
  651.       /* File not writeable, etc.  */
  652.       bfd_set_error (bfd_error_system_call);
  653.       _bfd_delete_bfd (nbfd);
  654.       return NULL;
  655.   }
  656.  
  657.   return nbfd;
  658. }
  659.  
  660. static inline void
  661. _maybe_make_executable (bfd * abfd)
  662. {
  663.   /* If the file was open for writing and is now executable,
  664.      make it so.  */
  665.   if (abfd->direction == write_direction
  666.       && (abfd->flags & (EXEC_P | DYNAMIC)) != 0)
  667.     {
  668.       struct stat buf;
  669.  
  670.       if (stat (abfd->filename, &buf) == 0
  671.           /* Do not attempt to change non-regular files.  This is
  672.              here especially for configure scripts and kernel builds
  673.              which run tests with "ld [...] -o /dev/null".  */
  674.           && S_ISREG(buf.st_mode))
  675.         {
  676. /*
  677.         unsigned int mask = umask (0);
  678.  
  679.         umask (mask);
  680.         chmod (abfd->filename,
  681.                  (0777
  682.                   & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask))));
  683. */
  684.         }
  685.     }
  686. }
  687.  
  688. /*
  689.  
  690. FUNCTION
  691.         bfd_close
  692.  
  693. SYNOPSIS
  694.         bfd_boolean bfd_close (bfd *abfd);
  695.  
  696. DESCRIPTION
  697.  
  698.         Close a BFD. If the BFD was open for writing, then pending
  699.         operations are completed and the file written out and closed.
  700.         If the created file is executable, then <<chmod>> is called
  701.         to mark it as such.
  702.  
  703.         All memory attached to the BFD is released.
  704.  
  705.         The file descriptor associated with the BFD is closed (even
  706.         if it was passed in to BFD by <<bfd_fdopenr>>).
  707.  
  708. RETURNS
  709.         <<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
  710. */
  711.  
  712.  
  713. bfd_boolean
  714. bfd_close (bfd *abfd)
  715. {
  716.   bfd_boolean ret;
  717.  
  718.   if (bfd_write_p (abfd))
  719.     {
  720.       if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)))
  721.         return FALSE;
  722.     }
  723.  
  724.   if (! BFD_SEND (abfd, _close_and_cleanup, (abfd)))
  725.     return FALSE;
  726.  
  727.   ret = abfd->iovec->bclose (abfd) == 0;
  728.  
  729.   if (ret)
  730.     _maybe_make_executable (abfd);
  731.  
  732.   _bfd_delete_bfd (abfd);
  733.  
  734.   return ret;
  735. }
  736.  
  737. /*
  738. FUNCTION
  739.         bfd_close_all_done
  740.  
  741. SYNOPSIS
  742.         bfd_boolean bfd_close_all_done (bfd *);
  743.  
  744. DESCRIPTION
  745.         Close a BFD.  Differs from <<bfd_close>> since it does not
  746.         complete any pending operations.  This routine would be used
  747.         if the application had just used BFD for swapping and didn't
  748.         want to use any of the writing code.
  749.  
  750.         If the created file is executable, then <<chmod>> is called
  751.         to mark it as such.
  752.  
  753.         All memory attached to the BFD is released.
  754.  
  755. RETURNS
  756.         <<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
  757. */
  758.  
  759. bfd_boolean
  760. bfd_close_all_done (bfd *abfd)
  761. {
  762.   bfd_boolean ret;
  763.  
  764.   ret = bfd_cache_close (abfd);
  765.  
  766.   if (ret)
  767.     _maybe_make_executable (abfd);
  768.  
  769.   _bfd_delete_bfd (abfd);
  770.  
  771.   return ret;
  772. }
  773.  
  774. /*
  775. FUNCTION
  776.         bfd_create
  777.  
  778. SYNOPSIS
  779.         bfd *bfd_create (const char *filename, bfd *templ);
  780.  
  781. DESCRIPTION
  782.         Create a new BFD in the manner of <<bfd_openw>>, but without
  783.         opening a file. The new BFD takes the target from the target
  784.         used by @var{templ}. The format is always set to <<bfd_object>>.
  785. */
  786.  
  787. bfd *
  788. bfd_create (const char *filename, bfd *templ)
  789. {
  790.   bfd *nbfd;
  791.  
  792.   nbfd = _bfd_new_bfd ();
  793.   if (nbfd == NULL)
  794.     return NULL;
  795.   nbfd->filename = filename;
  796.   if (templ)
  797.     nbfd->xvec = templ->xvec;
  798.   nbfd->direction = no_direction;
  799.   bfd_set_format (nbfd, bfd_object);
  800.  
  801.   return nbfd;
  802. }
  803.  
  804. /*
  805. FUNCTION
  806.         bfd_make_writable
  807.  
  808. SYNOPSIS
  809.         bfd_boolean bfd_make_writable (bfd *abfd);
  810.  
  811. DESCRIPTION
  812.         Takes a BFD as created by <<bfd_create>> and converts it
  813.         into one like as returned by <<bfd_openw>>.  It does this
  814.         by converting the BFD to BFD_IN_MEMORY.  It's assumed that
  815.         you will call <<bfd_make_readable>> on this bfd later.
  816.  
  817. RETURNS
  818.         <<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
  819. */
  820.  
  821. bfd_boolean
  822. bfd_make_writable (bfd *abfd)
  823. {
  824.   struct bfd_in_memory *bim;
  825.  
  826.   if (abfd->direction != no_direction)
  827.     {
  828.       bfd_set_error (bfd_error_invalid_operation);
  829.       return FALSE;
  830.     }
  831.  
  832.   bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory));
  833.   if (bim == NULL)
  834.     return FALSE;       /* bfd_error already set.  */
  835.   abfd->iostream = bim;
  836.   /* bfd_bwrite will grow these as needed.  */
  837.   bim->size = 0;
  838.   bim->buffer = 0;
  839.  
  840.   abfd->flags |= BFD_IN_MEMORY;
  841.   abfd->iovec = &_bfd_memory_iovec;
  842.   abfd->origin = 0;
  843.   abfd->direction = write_direction;
  844.   abfd->where = 0;
  845.  
  846.   return TRUE;
  847. }
  848.  
  849. /*
  850. FUNCTION
  851.         bfd_make_readable
  852.  
  853. SYNOPSIS
  854.         bfd_boolean bfd_make_readable (bfd *abfd);
  855.  
  856. DESCRIPTION
  857.         Takes a BFD as created by <<bfd_create>> and
  858.         <<bfd_make_writable>> and converts it into one like as
  859.         returned by <<bfd_openr>>.  It does this by writing the
  860.         contents out to the memory buffer, then reversing the
  861.         direction.
  862.  
  863. RETURNS
  864.         <<TRUE>> is returned if all is ok, otherwise <<FALSE>>.  */
  865.  
  866. bfd_boolean
  867. bfd_make_readable (bfd *abfd)
  868. {
  869.   if (abfd->direction != write_direction || !(abfd->flags & BFD_IN_MEMORY))
  870.     {
  871.       bfd_set_error (bfd_error_invalid_operation);
  872.       return FALSE;
  873.     }
  874.  
  875.   if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)))
  876.     return FALSE;
  877.  
  878.   if (! BFD_SEND (abfd, _close_and_cleanup, (abfd)))
  879.     return FALSE;
  880.  
  881.   abfd->arch_info = &bfd_default_arch_struct;
  882.  
  883.   abfd->where = 0;
  884.   abfd->format = bfd_unknown;
  885.   abfd->my_archive = NULL;
  886.   abfd->origin = 0;
  887.   abfd->opened_once = FALSE;
  888.   abfd->output_has_begun = FALSE;
  889.   abfd->section_count = 0;
  890.   abfd->usrdata = NULL;
  891.   abfd->cacheable = FALSE;
  892.   abfd->flags |= BFD_IN_MEMORY;
  893.   abfd->mtime_set = FALSE;
  894.  
  895.   abfd->target_defaulted = TRUE;
  896.   abfd->direction = read_direction;
  897.   abfd->sections = 0;
  898.   abfd->symcount = 0;
  899.   abfd->outsymbols = 0;
  900.   abfd->tdata.any = 0;
  901.  
  902.   bfd_section_list_clear (abfd);
  903.   bfd_check_format (abfd, bfd_object);
  904.  
  905.   return TRUE;
  906. }
  907.  
  908. /*
  909. FUNCTION
  910.         bfd_alloc
  911.  
  912. SYNOPSIS
  913.         void *bfd_alloc (bfd *abfd, bfd_size_type wanted);
  914.  
  915. DESCRIPTION
  916.         Allocate a block of @var{wanted} bytes of memory attached to
  917.         <<abfd>> and return a pointer to it.
  918. */
  919.  
  920. void *
  921. bfd_alloc (bfd *abfd, bfd_size_type size)
  922. {
  923.   void *ret;
  924.  
  925.   if (size != (unsigned long) size)
  926.     {
  927.       bfd_set_error (bfd_error_no_memory);
  928.       return NULL;
  929.     }
  930.  
  931.   ret = objalloc_alloc ((struct objalloc *) abfd->memory, (unsigned long) size);
  932.   if (ret == NULL)
  933.     bfd_set_error (bfd_error_no_memory);
  934.   return ret;
  935. }
  936.  
  937. /*
  938. INTERNAL_FUNCTION
  939.         bfd_alloc2
  940.  
  941. SYNOPSIS
  942.         void *bfd_alloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size);
  943.  
  944. DESCRIPTION
  945.         Allocate a block of @var{nmemb} elements of @var{size} bytes each
  946.         of memory attached to <<abfd>> and return a pointer to it.
  947. */
  948.  
  949. void *
  950. bfd_alloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size)
  951. {
  952.   void *ret;
  953.  
  954.   if ((nmemb | size) >= HALF_BFD_SIZE_TYPE
  955.       && size != 0
  956.       && nmemb > ~(bfd_size_type) 0 / size)
  957.     {
  958.       bfd_set_error (bfd_error_no_memory);
  959.       return NULL;
  960.     }
  961.  
  962.   size *= nmemb;
  963.  
  964.   if (size != (unsigned long) size)
  965.     {
  966.       bfd_set_error (bfd_error_no_memory);
  967.       return NULL;
  968.     }
  969.  
  970.   ret = objalloc_alloc ((struct objalloc *) abfd->memory, (unsigned long) size);
  971.   if (ret == NULL)
  972.     bfd_set_error (bfd_error_no_memory);
  973.   return ret;
  974. }
  975.  
  976. /*
  977. FUNCTION
  978.         bfd_zalloc
  979.  
  980. SYNOPSIS
  981.         void *bfd_zalloc (bfd *abfd, bfd_size_type wanted);
  982.  
  983. DESCRIPTION
  984.         Allocate a block of @var{wanted} bytes of zeroed memory
  985.         attached to <<abfd>> and return a pointer to it.
  986. */
  987.  
  988. void *
  989. bfd_zalloc (bfd *abfd, bfd_size_type size)
  990. {
  991.   void *res;
  992.  
  993.   res = bfd_alloc (abfd, size);
  994.   if (res)
  995.     memset (res, 0, (size_t) size);
  996.   return res;
  997. }
  998.  
  999. /*
  1000. INTERNAL_FUNCTION
  1001.         bfd_zalloc2
  1002.  
  1003. SYNOPSIS
  1004.         void *bfd_zalloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size);
  1005.  
  1006. DESCRIPTION
  1007.         Allocate a block of @var{nmemb} elements of @var{size} bytes each
  1008.         of zeroed memory attached to <<abfd>> and return a pointer to it.
  1009. */
  1010.  
  1011. void *
  1012. bfd_zalloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size)
  1013. {
  1014.   void *res;
  1015.  
  1016.   if ((nmemb | size) >= HALF_BFD_SIZE_TYPE
  1017.       && size != 0
  1018.       && nmemb > ~(bfd_size_type) 0 / size)
  1019.     {
  1020.       bfd_set_error (bfd_error_no_memory);
  1021.       return NULL;
  1022.     }
  1023.  
  1024.   size *= nmemb;
  1025.  
  1026.   res = bfd_alloc (abfd, size);
  1027.   if (res)
  1028.     memset (res, 0, (size_t) size);
  1029.   return res;
  1030. }
  1031.  
  1032. /* Free a block allocated for a BFD.
  1033.    Note:  Also frees all more recently allocated blocks!  */
  1034.  
  1035. void
  1036. bfd_release (bfd *abfd, void *block)
  1037. {
  1038.   objalloc_free_block ((struct objalloc *) abfd->memory, block);
  1039. }
  1040.  
  1041.  
  1042. /*
  1043.    GNU Extension: separate debug-info files
  1044.  
  1045.    The idea here is that a special section called .gnu_debuglink might be
  1046.    embedded in a binary file, which indicates that some *other* file
  1047.    contains the real debugging information. This special section contains a
  1048.    filename and CRC32 checksum, which we read and resolve to another file,
  1049.    if it exists.
  1050.  
  1051.    This facilitates "optional" provision of debugging information, without
  1052.    having to provide two complete copies of every binary object (with and
  1053.    without debug symbols).  */
  1054.  
  1055. #define GNU_DEBUGLINK           ".gnu_debuglink"
  1056. #define GNU_DEBUGALTLINK        ".gnu_debugaltlink"
  1057.  
  1058. /*
  1059. FUNCTION
  1060.         bfd_calc_gnu_debuglink_crc32
  1061.  
  1062. SYNOPSIS
  1063.         unsigned long bfd_calc_gnu_debuglink_crc32
  1064.           (unsigned long crc, const unsigned char *buf, bfd_size_type len);
  1065.  
  1066. DESCRIPTION
  1067.         Computes a CRC value as used in the .gnu_debuglink section.
  1068.         Advances the previously computed @var{crc} value by computing
  1069.         and adding in the crc32 for @var{len} bytes of @var{buf}.
  1070.  
  1071. RETURNS
  1072.         Return the updated CRC32 value.
  1073. */
  1074.  
  1075. unsigned long
  1076. bfd_calc_gnu_debuglink_crc32 (unsigned long crc,
  1077.                               const unsigned char *buf,
  1078.                               bfd_size_type len)
  1079. {
  1080.   static const unsigned long crc32_table[256] =
  1081.     {
  1082.       0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
  1083.       0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
  1084.       0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
  1085.       0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
  1086.       0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
  1087.       0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
  1088.       0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
  1089.       0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
  1090.       0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
  1091.       0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
  1092.       0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
  1093.       0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  1094.       0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
  1095.       0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
  1096.       0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
  1097.       0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
  1098.       0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
  1099.       0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
  1100.       0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
  1101.       0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
  1102.       0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
  1103.       0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
  1104.       0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
  1105.       0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  1106.       0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
  1107.       0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
  1108.       0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
  1109.       0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
  1110.       0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
  1111.       0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
  1112.       0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
  1113.       0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
  1114.       0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
  1115.       0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
  1116.       0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
  1117.       0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  1118.       0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
  1119.       0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
  1120.       0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
  1121.       0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
  1122.       0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
  1123.       0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
  1124.       0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
  1125.       0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
  1126.       0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
  1127.       0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
  1128.       0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
  1129.       0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  1130.       0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
  1131.       0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
  1132.       0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
  1133.       0x2d02ef8d
  1134.     };
  1135.   const unsigned char *end;
  1136.  
  1137.   crc = ~crc & 0xffffffff;
  1138.   for (end = buf + len; buf < end; ++ buf)
  1139.     crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
  1140.   return ~crc & 0xffffffff;
  1141. }
  1142.  
  1143.  
  1144. /*
  1145. FUNCTION
  1146.         bfd_get_debug_link_info
  1147.  
  1148. SYNOPSIS
  1149.         char *bfd_get_debug_link_info (bfd *abfd, unsigned long *crc32_out);
  1150.  
  1151. DESCRIPTION
  1152.         fetch the filename and CRC32 value for any separate debuginfo
  1153.         associated with @var{abfd}. Return NULL if no such info found,
  1154.         otherwise return filename and update @var{crc32_out}.  The
  1155.         returned filename is allocated with @code{malloc}; freeing it
  1156.         is the responsibility of the caller.
  1157. */
  1158.  
  1159. char *
  1160. bfd_get_debug_link_info (bfd *abfd, unsigned long *crc32_out)
  1161. {
  1162.   asection *sect;
  1163.   unsigned long crc32;
  1164.   bfd_byte *contents;
  1165.   int crc_offset;
  1166.   char *name;
  1167.  
  1168.   BFD_ASSERT (abfd);
  1169.   BFD_ASSERT (crc32_out);
  1170.  
  1171.   sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK);
  1172.  
  1173.   if (sect == NULL)
  1174.     return NULL;
  1175.  
  1176.   if (!bfd_malloc_and_get_section (abfd, sect, &contents))
  1177.     {
  1178.       if (contents != NULL)
  1179.         free (contents);
  1180.       return NULL;
  1181.     }
  1182.  
  1183.   /* Crc value is stored after the filename, aligned up to 4 bytes.  */
  1184.   name = (char *) contents;
  1185.   crc_offset = strlen (name) + 1;
  1186.   crc_offset = (crc_offset + 3) & ~3;
  1187.  
  1188.   crc32 = bfd_get_32 (abfd, contents + crc_offset);
  1189.  
  1190.   *crc32_out = crc32;
  1191.   return name;
  1192. }
  1193.  
  1194. /*
  1195. FUNCTION
  1196.         bfd_get_alt_debug_link_info
  1197.  
  1198. SYNOPSIS
  1199.         char *bfd_get_alt_debug_link_info (bfd *abfd, unsigned long *crc32_out);
  1200.  
  1201. DESCRIPTION
  1202.         Fetch the filename and BuildID value for any alternate debuginfo
  1203.         associated with @var{abfd}.  Return NULL if no such info found,
  1204.         otherwise return filename and update @var{buildid_out}.  The
  1205.         returned filename is allocated with @code{malloc}; freeing it
  1206.         is the responsibility of the caller.
  1207. */
  1208.  
  1209. char *
  1210. bfd_get_alt_debug_link_info (bfd * abfd, unsigned long * buildid_out)
  1211. {
  1212.   asection *sect;
  1213.   bfd_byte *contents;
  1214.   int buildid_offset;
  1215.   char *name;
  1216.  
  1217.   BFD_ASSERT (abfd);
  1218.   BFD_ASSERT (buildid_out);
  1219.  
  1220.   sect = bfd_get_section_by_name (abfd, GNU_DEBUGALTLINK);
  1221.  
  1222.   if (sect == NULL)
  1223.     return NULL;
  1224.  
  1225.   if (!bfd_malloc_and_get_section (abfd, sect, & contents))
  1226.     {
  1227.       if (contents != NULL)
  1228.         free (contents);
  1229.       return NULL;
  1230.     }
  1231.  
  1232.   /* BuildID value is stored after the filename, aligned up to 4 bytes.  */
  1233.   name = (char *) contents;
  1234.   buildid_offset = strlen (name) + 1;
  1235.   buildid_offset = (buildid_offset + 3) & ~3;
  1236.  
  1237.   * buildid_out = bfd_get_32 (abfd, contents + buildid_offset);
  1238.  
  1239.   return name;
  1240. }
  1241.  
  1242. /*
  1243. INTERNAL_FUNCTION
  1244.         separate_debug_file_exists
  1245.  
  1246. SYNOPSIS
  1247.         bfd_boolean separate_debug_file_exists
  1248.           (char *name, unsigned long crc32);
  1249.  
  1250. DESCRIPTION
  1251.         Checks to see if @var{name} is a file and if its contents
  1252.         match @var{crc32}.
  1253. */
  1254.  
  1255. static bfd_boolean
  1256. separate_debug_file_exists (const char *name, const unsigned long crc)
  1257. {
  1258.   static unsigned char buffer [8 * 1024];
  1259.   unsigned long file_crc = 0;
  1260.   FILE *f;
  1261.   bfd_size_type count;
  1262.  
  1263.   BFD_ASSERT (name);
  1264.  
  1265.   f = real_fopen (name, FOPEN_RB);
  1266.   if (f == NULL)
  1267.     return FALSE;
  1268.  
  1269.   while ((count = fread (buffer, 1, sizeof (buffer), f)) > 0)
  1270.     file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count);
  1271.  
  1272.   fclose (f);
  1273.  
  1274.   return crc == file_crc;
  1275. }
  1276.  
  1277. /*
  1278. INTERNAL_FUNCTION
  1279.         separate_alt_debug_file_exists
  1280.  
  1281. SYNOPSIS
  1282.         bfd_boolean separate_alt_debug_file_exists
  1283.           (char *name, unsigned long crc32);
  1284.  
  1285. DESCRIPTION
  1286.         Checks to see if @var{name} is a file and if its BuildID
  1287.         matches @var{buildid}.
  1288. */
  1289.  
  1290. static bfd_boolean
  1291. separate_alt_debug_file_exists (const char *name,
  1292.                                 const unsigned long buildid ATTRIBUTE_UNUSED)
  1293. {
  1294.   FILE *f;
  1295.  
  1296.   BFD_ASSERT (name);
  1297.  
  1298.   f = real_fopen (name, FOPEN_RB);
  1299.   if (f == NULL)
  1300.     return FALSE;
  1301.  
  1302.   /* FIXME: Add code to check buildid.  */
  1303.  
  1304.   fclose (f);
  1305.  
  1306.   return TRUE;
  1307. }
  1308.  
  1309. /*
  1310. INTERNAL_FUNCTION
  1311.         find_separate_debug_file
  1312.  
  1313. SYNOPSIS
  1314.         char *find_separate_debug_file (bfd *abfd);
  1315.  
  1316. DESCRIPTION
  1317.         Searches @var{abfd} for a section called @var{section_name} which
  1318.         is expected to contain a reference to a file containing separate
  1319.         debugging information.  The function scans various locations in
  1320.         the filesystem, including the file tree rooted at
  1321.         @var{debug_file_directory}, and returns the first matching
  1322.         filename that it finds.  If @var{check_crc} is TRUE then the
  1323.         contents of the file must also match the CRC value contained in
  1324.         @var{section_name}.  Returns NULL if no valid file could be found.
  1325. */
  1326.  
  1327. typedef char *      (* get_func_type) (bfd *, unsigned long *);
  1328. typedef bfd_boolean (* check_func_type) (const char *, const unsigned long);
  1329.  
  1330. static char *
  1331. find_separate_debug_file (bfd *           abfd,
  1332.                           const char *    debug_file_directory,
  1333.                           get_func_type   get_func,
  1334.                           check_func_type check_func)
  1335. {
  1336.   char *base;
  1337.   char *dir;
  1338.   char *debugfile;
  1339.   char *canon_dir;
  1340.   unsigned long crc32;
  1341.   size_t dirlen;
  1342.   size_t canon_dirlen;
  1343.  
  1344.   BFD_ASSERT (abfd);
  1345.   if (debug_file_directory == NULL)
  1346.     debug_file_directory = ".";
  1347.  
  1348.   /* BFD may have been opened from a stream.  */
  1349.   if (abfd->filename == NULL)
  1350.     {
  1351.       bfd_set_error (bfd_error_invalid_operation);
  1352.       return NULL;
  1353.     }
  1354.  
  1355.   base = get_func (abfd, & crc32);
  1356.    
  1357.   if (base == NULL)
  1358.     return NULL;
  1359.  
  1360.   if (base[0] == '\0')
  1361.     {
  1362.       free (base);
  1363.       bfd_set_error (bfd_error_no_debug_section);
  1364.       return NULL;
  1365.     }
  1366.  
  1367.   for (dirlen = strlen (abfd->filename); dirlen > 0; dirlen--)
  1368.     if (IS_DIR_SEPARATOR (abfd->filename[dirlen - 1]))
  1369.       break;
  1370.  
  1371.   dir = (char *) bfd_malloc (dirlen + 1);
  1372.   if (dir == NULL)
  1373.     {
  1374.       free (base);
  1375.       return NULL;
  1376.     }
  1377.   memcpy (dir, abfd->filename, dirlen);
  1378.   dir[dirlen] = '\0';
  1379.  
  1380.   /* Compute the canonical name of the bfd object with all symbolic links
  1381.      resolved, for use in the global debugfile directory.  */
  1382.   canon_dir = lrealpath (abfd->filename);
  1383.   for (canon_dirlen = strlen (canon_dir); canon_dirlen > 0; canon_dirlen--)
  1384.     if (IS_DIR_SEPARATOR (canon_dir[canon_dirlen - 1]))
  1385.       break;
  1386.   canon_dir[canon_dirlen] = '\0';
  1387.  
  1388.   debugfile = (char *)
  1389.       bfd_malloc (strlen (debug_file_directory) + 1
  1390.                   + (canon_dirlen > dirlen ? canon_dirlen : dirlen)
  1391.                   + strlen (".debug/")
  1392.                   + strlen (base)
  1393.                   + 1);
  1394.   if (debugfile == NULL)
  1395.     goto found; /* Actually this returns NULL.  */
  1396.  
  1397.   /* First try in the same directory as the original file:  */
  1398.   strcpy (debugfile, dir);
  1399.   strcat (debugfile, base);
  1400.  
  1401.   if (check_func (debugfile, crc32))
  1402.     goto found;
  1403.  
  1404.   /* Then try in a subdirectory called .debug.  */
  1405.   strcpy (debugfile, dir);
  1406.   strcat (debugfile, ".debug/");
  1407.   strcat (debugfile, base);
  1408.  
  1409.   if (check_func (debugfile, crc32))
  1410.     goto found;
  1411.  
  1412.   /* Then try in the global debugfile directory.  */
  1413.   strcpy (debugfile, debug_file_directory);
  1414.   dirlen = strlen (debug_file_directory) - 1;
  1415.   if (dirlen > 0
  1416.       && debug_file_directory[dirlen] != '/'
  1417.       && canon_dir[0] != '/')
  1418.     strcat (debugfile, "/");
  1419.   strcat (debugfile, canon_dir);
  1420.   strcat (debugfile, base);
  1421.  
  1422.   if (check_func (debugfile, crc32))
  1423.     goto found;
  1424.  
  1425.   /* Failed to find the file.  */
  1426.   free (debugfile);
  1427.   debugfile = NULL;
  1428.  
  1429.  found:
  1430.   free (base);
  1431.   free (dir);
  1432.   free (canon_dir);
  1433.   return debugfile;
  1434. }
  1435.  
  1436.  
  1437. /*
  1438. FUNCTION
  1439.         bfd_follow_gnu_debuglink
  1440.  
  1441. SYNOPSIS
  1442.         char *bfd_follow_gnu_debuglink (bfd *abfd, const char *dir);
  1443.  
  1444. DESCRIPTION
  1445.  
  1446.         Takes a BFD and searches it for a .gnu_debuglink section.  If this
  1447.         section is found, it examines the section for the name and checksum
  1448.         of a '.debug' file containing auxiliary debugging information.  It
  1449.         then searches the filesystem for this .debug file in some standard
  1450.         locations, including the directory tree rooted at @var{dir}, and if
  1451.         found returns the full filename.
  1452.  
  1453.         If @var{dir} is NULL, it will search a default path configured into
  1454.         libbfd at build time.  [XXX this feature is not currently
  1455.         implemented].
  1456.  
  1457. RETURNS
  1458.         <<NULL>> on any errors or failure to locate the .debug file,
  1459.         otherwise a pointer to a heap-allocated string containing the
  1460.         filename.  The caller is responsible for freeing this string.
  1461. */
  1462.  
  1463. char *
  1464. bfd_follow_gnu_debuglink (bfd *abfd, const char *dir)
  1465. {
  1466.   return find_separate_debug_file (abfd, dir,
  1467.                                    bfd_get_debug_link_info,
  1468.                                    separate_debug_file_exists);
  1469. }
  1470.  
  1471. /*
  1472. FUNCTION
  1473.         bfd_follow_gnu_debugaltlink
  1474.  
  1475. SYNOPSIS
  1476.         char *bfd_follow_gnu_debugaltlink (bfd *abfd, const char *dir);
  1477.  
  1478. DESCRIPTION
  1479.  
  1480.         Takes a BFD and searches it for a .gnu_debugaltlink section.  If this
  1481.         section is found, it examines the section for the name of a file
  1482.         containing auxiliary debugging information.  It then searches the
  1483.         filesystem for this file in a set of standard locations, including
  1484.         the directory tree rooted at @var{dir}, and if found returns the
  1485.         full filename.
  1486.  
  1487.         If @var{dir} is NULL, it will search a default path configured into
  1488.         libbfd at build time.  [FIXME: This feature is not currently
  1489.         implemented].
  1490.  
  1491. RETURNS
  1492.         <<NULL>> on any errors or failure to locate the debug file,
  1493.         otherwise a pointer to a heap-allocated string containing the
  1494.         filename.  The caller is responsible for freeing this string.
  1495. */
  1496.  
  1497. char *
  1498. bfd_follow_gnu_debugaltlink (bfd *abfd, const char *dir)
  1499. {
  1500.   return find_separate_debug_file (abfd, dir,
  1501.                                    bfd_get_alt_debug_link_info,
  1502.                                    separate_alt_debug_file_exists);
  1503. }
  1504.  
  1505. /*
  1506. FUNCTION
  1507.         bfd_create_gnu_debuglink_section
  1508.  
  1509. SYNOPSIS
  1510.         struct bfd_section *bfd_create_gnu_debuglink_section
  1511.           (bfd *abfd, const char *filename);
  1512.  
  1513. DESCRIPTION
  1514.  
  1515.         Takes a @var{BFD} and adds a .gnu_debuglink section to it.  The section is sized
  1516.         to be big enough to contain a link to the specified @var{filename}.
  1517.  
  1518. RETURNS
  1519.         A pointer to the new section is returned if all is ok.  Otherwise <<NULL>> is
  1520.         returned and bfd_error is set.
  1521. */
  1522.  
  1523. asection *
  1524. bfd_create_gnu_debuglink_section (bfd *abfd, const char *filename)
  1525. {
  1526.   asection *sect;
  1527.   bfd_size_type debuglink_size;
  1528.   flagword flags;
  1529.  
  1530.   if (abfd == NULL || filename == NULL)
  1531.     {
  1532.       bfd_set_error (bfd_error_invalid_operation);
  1533.       return NULL;
  1534.     }
  1535.  
  1536.   /* Strip off any path components in filename.  */
  1537.   filename = lbasename (filename);
  1538.  
  1539.   sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK);
  1540.   if (sect)
  1541.     {
  1542.       /* Section already exists.  */
  1543.       bfd_set_error (bfd_error_invalid_operation);
  1544.       return NULL;
  1545.     }
  1546.  
  1547.   flags = SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING;
  1548.   sect = bfd_make_section_with_flags (abfd, GNU_DEBUGLINK, flags);
  1549.   if (sect == NULL)
  1550.     return NULL;
  1551.  
  1552.   debuglink_size = strlen (filename) + 1;
  1553.   debuglink_size += 3;
  1554.   debuglink_size &= ~3;
  1555.   debuglink_size += 4;
  1556.  
  1557.   if (! bfd_set_section_size (abfd, sect, debuglink_size))
  1558.     /* XXX Should we delete the section from the bfd ?  */
  1559.     return NULL;
  1560.  
  1561.   return sect;
  1562. }
  1563.  
  1564.  
  1565. /*
  1566. FUNCTION
  1567.         bfd_fill_in_gnu_debuglink_section
  1568.  
  1569. SYNOPSIS
  1570.         bfd_boolean bfd_fill_in_gnu_debuglink_section
  1571.           (bfd *abfd, struct bfd_section *sect, const char *filename);
  1572.  
  1573. DESCRIPTION
  1574.  
  1575.         Takes a @var{BFD} and containing a .gnu_debuglink section @var{SECT}
  1576.         and fills in the contents of the section to contain a link to the
  1577.         specified @var{filename}.  The filename should be relative to the
  1578.         current directory.
  1579.  
  1580. RETURNS
  1581.         <<TRUE>> is returned if all is ok.  Otherwise <<FALSE>> is returned
  1582.         and bfd_error is set.
  1583. */
  1584.  
  1585. bfd_boolean
  1586. bfd_fill_in_gnu_debuglink_section (bfd *abfd,
  1587.                                    struct bfd_section *sect,
  1588.                                    const char *filename)
  1589. {
  1590.   bfd_size_type debuglink_size;
  1591.   unsigned long crc32;
  1592.   char * contents;
  1593.   bfd_size_type crc_offset;
  1594.   FILE * handle;
  1595.   static unsigned char buffer[8 * 1024];
  1596.   size_t count;
  1597.   size_t filelen;
  1598.  
  1599.   if (abfd == NULL || sect == NULL || filename == NULL)
  1600.     {
  1601.       bfd_set_error (bfd_error_invalid_operation);
  1602.       return FALSE;
  1603.     }
  1604.  
  1605.   /* Make sure that we can read the file.
  1606.      XXX - Should we attempt to locate the debug info file using the same
  1607.      algorithm as gdb ?  At the moment, since we are creating the
  1608.      .gnu_debuglink section, we insist upon the user providing us with a
  1609.      correct-for-section-creation-time path, but this need not conform to
  1610.      the gdb location algorithm.  */
  1611.   handle = real_fopen (filename, FOPEN_RB);
  1612.   if (handle == NULL)
  1613.     {
  1614.       bfd_set_error (bfd_error_system_call);
  1615.       return FALSE;
  1616.     }
  1617.  
  1618.   crc32 = 0;
  1619.   while ((count = fread (buffer, 1, sizeof buffer, handle)) > 0)
  1620.     crc32 = bfd_calc_gnu_debuglink_crc32 (crc32, buffer, count);
  1621.   fclose (handle);
  1622.  
  1623.   /* Strip off any path components in filename,
  1624.      now that we no longer need them.  */
  1625.   filename = lbasename (filename);
  1626.  
  1627.   filelen = strlen (filename);
  1628.   debuglink_size = filelen + 1;
  1629.   debuglink_size += 3;
  1630.   debuglink_size &= ~3;
  1631.   debuglink_size += 4;
  1632.  
  1633.   contents = (char *) bfd_malloc (debuglink_size);
  1634.   if (contents == NULL)
  1635.     {
  1636.       /* XXX Should we delete the section from the bfd ?  */
  1637.       return FALSE;
  1638.     }
  1639.  
  1640.   crc_offset = debuglink_size - 4;
  1641.   memcpy (contents, filename, filelen);
  1642.   memset (contents + filelen, 0, crc_offset - filelen);
  1643.  
  1644.   bfd_put_32 (abfd, crc32, contents + crc_offset);
  1645.  
  1646.   if (! bfd_set_section_contents (abfd, sect, contents, 0, debuglink_size))
  1647.     {
  1648.       /* XXX Should we delete the section from the bfd ?  */
  1649.       free (contents);
  1650.       return FALSE;
  1651.     }
  1652.  
  1653.   return TRUE;
  1654. }
  1655.