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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.           unsigned int mask = umask (0);
  677.  
  678.           umask (mask);
  679.           chmod (abfd->filename,
  680.                  (0777
  681.                   & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask))));
  682.         }
  683.     }
  684. }
  685.  
  686. /*
  687.  
  688. FUNCTION
  689.         bfd_close
  690.  
  691. SYNOPSIS
  692.         bfd_boolean bfd_close (bfd *abfd);
  693.  
  694. DESCRIPTION
  695.  
  696.         Close a BFD. If the BFD was open for writing, then pending
  697.         operations are completed and the file written out and closed.
  698.         If the created file is executable, then <<chmod>> is called
  699.         to mark it as such.
  700.  
  701.         All memory attached to the BFD is released.
  702.  
  703.         The file descriptor associated with the BFD is closed (even
  704.         if it was passed in to BFD by <<bfd_fdopenr>>).
  705.  
  706. RETURNS
  707.         <<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
  708. */
  709.  
  710.  
  711. bfd_boolean
  712. bfd_close (bfd *abfd)
  713. {
  714.   bfd_boolean ret;
  715.  
  716.   if (bfd_write_p (abfd))
  717.     {
  718.       if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)))
  719.         return FALSE;
  720.     }
  721.  
  722.   if (! BFD_SEND (abfd, _close_and_cleanup, (abfd)))
  723.     return FALSE;
  724.  
  725.   ret = abfd->iovec->bclose (abfd) == 0;
  726.  
  727.   if (ret)
  728.     _maybe_make_executable (abfd);
  729.  
  730.   _bfd_delete_bfd (abfd);
  731.  
  732.   return ret;
  733. }
  734.  
  735. /*
  736. FUNCTION
  737.         bfd_close_all_done
  738.  
  739. SYNOPSIS
  740.         bfd_boolean bfd_close_all_done (bfd *);
  741.  
  742. DESCRIPTION
  743.         Close a BFD.  Differs from <<bfd_close>> since it does not
  744.         complete any pending operations.  This routine would be used
  745.         if the application had just used BFD for swapping and didn't
  746.         want to use any of the writing code.
  747.  
  748.         If the created file is executable, then <<chmod>> is called
  749.         to mark it as such.
  750.  
  751.         All memory attached to the BFD is released.
  752.  
  753. RETURNS
  754.         <<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
  755. */
  756.  
  757. bfd_boolean
  758. bfd_close_all_done (bfd *abfd)
  759. {
  760.   bfd_boolean ret;
  761.  
  762.   ret = bfd_cache_close (abfd);
  763.  
  764.   if (ret)
  765.     _maybe_make_executable (abfd);
  766.  
  767.   _bfd_delete_bfd (abfd);
  768.  
  769.   return ret;
  770. }
  771.  
  772. /*
  773. FUNCTION
  774.         bfd_create
  775.  
  776. SYNOPSIS
  777.         bfd *bfd_create (const char *filename, bfd *templ);
  778.  
  779. DESCRIPTION
  780.         Create a new BFD in the manner of <<bfd_openw>>, but without
  781.         opening a file. The new BFD takes the target from the target
  782.         used by @var{templ}. The format is always set to <<bfd_object>>.
  783. */
  784.  
  785. bfd *
  786. bfd_create (const char *filename, bfd *templ)
  787. {
  788.   bfd *nbfd;
  789.  
  790.   nbfd = _bfd_new_bfd ();
  791.   if (nbfd == NULL)
  792.     return NULL;
  793.   nbfd->filename = filename;
  794.   if (templ)
  795.     nbfd->xvec = templ->xvec;
  796.   nbfd->direction = no_direction;
  797.   bfd_set_format (nbfd, bfd_object);
  798.  
  799.   return nbfd;
  800. }
  801.  
  802. /*
  803. FUNCTION
  804.         bfd_make_writable
  805.  
  806. SYNOPSIS
  807.         bfd_boolean bfd_make_writable (bfd *abfd);
  808.  
  809. DESCRIPTION
  810.         Takes a BFD as created by <<bfd_create>> and converts it
  811.         into one like as returned by <<bfd_openw>>.  It does this
  812.         by converting the BFD to BFD_IN_MEMORY.  It's assumed that
  813.         you will call <<bfd_make_readable>> on this bfd later.
  814.  
  815. RETURNS
  816.         <<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
  817. */
  818.  
  819. bfd_boolean
  820. bfd_make_writable (bfd *abfd)
  821. {
  822.   struct bfd_in_memory *bim;
  823.  
  824.   if (abfd->direction != no_direction)
  825.     {
  826.       bfd_set_error (bfd_error_invalid_operation);
  827.       return FALSE;
  828.     }
  829.  
  830.   bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory));
  831.   if (bim == NULL)
  832.     return FALSE;       /* bfd_error already set.  */
  833.   abfd->iostream = bim;
  834.   /* bfd_bwrite will grow these as needed.  */
  835.   bim->size = 0;
  836.   bim->buffer = 0;
  837.  
  838.   abfd->flags |= BFD_IN_MEMORY;
  839.   abfd->iovec = &_bfd_memory_iovec;
  840.   abfd->origin = 0;
  841.   abfd->direction = write_direction;
  842.   abfd->where = 0;
  843.  
  844.   return TRUE;
  845. }
  846.  
  847. /*
  848. FUNCTION
  849.         bfd_make_readable
  850.  
  851. SYNOPSIS
  852.         bfd_boolean bfd_make_readable (bfd *abfd);
  853.  
  854. DESCRIPTION
  855.         Takes a BFD as created by <<bfd_create>> and
  856.         <<bfd_make_writable>> and converts it into one like as
  857.         returned by <<bfd_openr>>.  It does this by writing the
  858.         contents out to the memory buffer, then reversing the
  859.         direction.
  860.  
  861. RETURNS
  862.         <<TRUE>> is returned if all is ok, otherwise <<FALSE>>.  */
  863.  
  864. bfd_boolean
  865. bfd_make_readable (bfd *abfd)
  866. {
  867.   if (abfd->direction != write_direction || !(abfd->flags & BFD_IN_MEMORY))
  868.     {
  869.       bfd_set_error (bfd_error_invalid_operation);
  870.       return FALSE;
  871.     }
  872.  
  873.   if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)))
  874.     return FALSE;
  875.  
  876.   if (! BFD_SEND (abfd, _close_and_cleanup, (abfd)))
  877.     return FALSE;
  878.  
  879.   abfd->arch_info = &bfd_default_arch_struct;
  880.  
  881.   abfd->where = 0;
  882.   abfd->format = bfd_unknown;
  883.   abfd->my_archive = NULL;
  884.   abfd->origin = 0;
  885.   abfd->opened_once = FALSE;
  886.   abfd->output_has_begun = FALSE;
  887.   abfd->section_count = 0;
  888.   abfd->usrdata = NULL;
  889.   abfd->cacheable = FALSE;
  890.   abfd->flags |= BFD_IN_MEMORY;
  891.   abfd->mtime_set = FALSE;
  892.  
  893.   abfd->target_defaulted = TRUE;
  894.   abfd->direction = read_direction;
  895.   abfd->sections = 0;
  896.   abfd->symcount = 0;
  897.   abfd->outsymbols = 0;
  898.   abfd->tdata.any = 0;
  899.  
  900.   bfd_section_list_clear (abfd);
  901.   bfd_check_format (abfd, bfd_object);
  902.  
  903.   return TRUE;
  904. }
  905.  
  906. /*
  907. FUNCTION
  908.         bfd_alloc
  909.  
  910. SYNOPSIS
  911.         void *bfd_alloc (bfd *abfd, bfd_size_type wanted);
  912.  
  913. DESCRIPTION
  914.         Allocate a block of @var{wanted} bytes of memory attached to
  915.         <<abfd>> and return a pointer to it.
  916. */
  917.  
  918. void *
  919. bfd_alloc (bfd *abfd, bfd_size_type size)
  920. {
  921.   void *ret;
  922.  
  923.   if (size != (unsigned long) size)
  924.     {
  925.       bfd_set_error (bfd_error_no_memory);
  926.       return NULL;
  927.     }
  928.  
  929.   ret = objalloc_alloc ((struct objalloc *) abfd->memory, (unsigned long) size);
  930.   if (ret == NULL)
  931.     bfd_set_error (bfd_error_no_memory);
  932.   return ret;
  933. }
  934.  
  935. /*
  936. INTERNAL_FUNCTION
  937.         bfd_alloc2
  938.  
  939. SYNOPSIS
  940.         void *bfd_alloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size);
  941.  
  942. DESCRIPTION
  943.         Allocate a block of @var{nmemb} elements of @var{size} bytes each
  944.         of memory attached to <<abfd>> and return a pointer to it.
  945. */
  946.  
  947. void *
  948. bfd_alloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size)
  949. {
  950.   void *ret;
  951.  
  952.   if ((nmemb | size) >= HALF_BFD_SIZE_TYPE
  953.       && size != 0
  954.       && nmemb > ~(bfd_size_type) 0 / size)
  955.     {
  956.       bfd_set_error (bfd_error_no_memory);
  957.       return NULL;
  958.     }
  959.  
  960.   size *= nmemb;
  961.  
  962.   if (size != (unsigned long) size)
  963.     {
  964.       bfd_set_error (bfd_error_no_memory);
  965.       return NULL;
  966.     }
  967.  
  968.   ret = objalloc_alloc ((struct objalloc *) abfd->memory, (unsigned long) size);
  969.   if (ret == NULL)
  970.     bfd_set_error (bfd_error_no_memory);
  971.   return ret;
  972. }
  973.  
  974. /*
  975. FUNCTION
  976.         bfd_zalloc
  977.  
  978. SYNOPSIS
  979.         void *bfd_zalloc (bfd *abfd, bfd_size_type wanted);
  980.  
  981. DESCRIPTION
  982.         Allocate a block of @var{wanted} bytes of zeroed memory
  983.         attached to <<abfd>> and return a pointer to it.
  984. */
  985.  
  986. void *
  987. bfd_zalloc (bfd *abfd, bfd_size_type size)
  988. {
  989.   void *res;
  990.  
  991.   res = bfd_alloc (abfd, size);
  992.   if (res)
  993.     memset (res, 0, (size_t) size);
  994.   return res;
  995. }
  996.  
  997. /*
  998. INTERNAL_FUNCTION
  999.         bfd_zalloc2
  1000.  
  1001. SYNOPSIS
  1002.         void *bfd_zalloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size);
  1003.  
  1004. DESCRIPTION
  1005.         Allocate a block of @var{nmemb} elements of @var{size} bytes each
  1006.         of zeroed memory attached to <<abfd>> and return a pointer to it.
  1007. */
  1008.  
  1009. void *
  1010. bfd_zalloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size)
  1011. {
  1012.   void *res;
  1013.  
  1014.   if ((nmemb | size) >= HALF_BFD_SIZE_TYPE
  1015.       && size != 0
  1016.       && nmemb > ~(bfd_size_type) 0 / size)
  1017.     {
  1018.       bfd_set_error (bfd_error_no_memory);
  1019.       return NULL;
  1020.     }
  1021.  
  1022.   size *= nmemb;
  1023.  
  1024.   res = bfd_alloc (abfd, size);
  1025.   if (res)
  1026.     memset (res, 0, (size_t) size);
  1027.   return res;
  1028. }
  1029.  
  1030. /* Free a block allocated for a BFD.
  1031.    Note:  Also frees all more recently allocated blocks!  */
  1032.  
  1033. void
  1034. bfd_release (bfd *abfd, void *block)
  1035. {
  1036.   objalloc_free_block ((struct objalloc *) abfd->memory, block);
  1037. }
  1038.  
  1039.  
  1040. /*
  1041.    GNU Extension: separate debug-info files
  1042.  
  1043.    The idea here is that a special section called .gnu_debuglink might be
  1044.    embedded in a binary file, which indicates that some *other* file
  1045.    contains the real debugging information. This special section contains a
  1046.    filename and CRC32 checksum, which we read and resolve to another file,
  1047.    if it exists.
  1048.  
  1049.    This facilitates "optional" provision of debugging information, without
  1050.    having to provide two complete copies of every binary object (with and
  1051.    without debug symbols).  */
  1052.  
  1053. #define GNU_DEBUGLINK           ".gnu_debuglink"
  1054. #define GNU_DEBUGALTLINK        ".gnu_debugaltlink"
  1055.  
  1056. /*
  1057. FUNCTION
  1058.         bfd_calc_gnu_debuglink_crc32
  1059.  
  1060. SYNOPSIS
  1061.         unsigned long bfd_calc_gnu_debuglink_crc32
  1062.           (unsigned long crc, const unsigned char *buf, bfd_size_type len);
  1063.  
  1064. DESCRIPTION
  1065.         Computes a CRC value as used in the .gnu_debuglink section.
  1066.         Advances the previously computed @var{crc} value by computing
  1067.         and adding in the crc32 for @var{len} bytes of @var{buf}.
  1068.  
  1069. RETURNS
  1070.         Return the updated CRC32 value.
  1071. */
  1072.  
  1073. unsigned long
  1074. bfd_calc_gnu_debuglink_crc32 (unsigned long crc,
  1075.                               const unsigned char *buf,
  1076.                               bfd_size_type len)
  1077. {
  1078.   static const unsigned long crc32_table[256] =
  1079.     {
  1080.       0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
  1081.       0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
  1082.       0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
  1083.       0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
  1084.       0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
  1085.       0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
  1086.       0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
  1087.       0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
  1088.       0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
  1089.       0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
  1090.       0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
  1091.       0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  1092.       0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
  1093.       0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
  1094.       0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
  1095.       0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
  1096.       0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
  1097.       0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
  1098.       0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
  1099.       0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
  1100.       0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
  1101.       0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
  1102.       0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
  1103.       0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  1104.       0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
  1105.       0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
  1106.       0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
  1107.       0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
  1108.       0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
  1109.       0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
  1110.       0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
  1111.       0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
  1112.       0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
  1113.       0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
  1114.       0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
  1115.       0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  1116.       0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
  1117.       0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
  1118.       0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
  1119.       0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
  1120.       0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
  1121.       0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
  1122.       0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
  1123.       0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
  1124.       0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
  1125.       0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
  1126.       0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
  1127.       0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  1128.       0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
  1129.       0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
  1130.       0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
  1131.       0x2d02ef8d
  1132.     };
  1133.   const unsigned char *end;
  1134.  
  1135.   crc = ~crc & 0xffffffff;
  1136.   for (end = buf + len; buf < end; ++ buf)
  1137.     crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
  1138.   return ~crc & 0xffffffff;
  1139. }
  1140.  
  1141.  
  1142. /*
  1143. FUNCTION
  1144.         bfd_get_debug_link_info
  1145.  
  1146. SYNOPSIS
  1147.         char *bfd_get_debug_link_info (bfd *abfd, unsigned long *crc32_out);
  1148.  
  1149. DESCRIPTION
  1150.         fetch the filename and CRC32 value for any separate debuginfo
  1151.         associated with @var{abfd}. Return NULL if no such info found,
  1152.         otherwise return filename and update @var{crc32_out}.  The
  1153.         returned filename is allocated with @code{malloc}; freeing it
  1154.         is the responsibility of the caller.
  1155. */
  1156.  
  1157. char *
  1158. bfd_get_debug_link_info (bfd *abfd, unsigned long *crc32_out)
  1159. {
  1160.   asection *sect;
  1161.   unsigned long crc32;
  1162.   bfd_byte *contents;
  1163.   int crc_offset;
  1164.   char *name;
  1165.  
  1166.   BFD_ASSERT (abfd);
  1167.   BFD_ASSERT (crc32_out);
  1168.  
  1169.   sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK);
  1170.  
  1171.   if (sect == NULL)
  1172.     return NULL;
  1173.  
  1174.   if (!bfd_malloc_and_get_section (abfd, sect, &contents))
  1175.     {
  1176.       if (contents != NULL)
  1177.         free (contents);
  1178.       return NULL;
  1179.     }
  1180.  
  1181.   /* Crc value is stored after the filename, aligned up to 4 bytes.  */
  1182.   name = (char *) contents;
  1183.   crc_offset = strlen (name) + 1;
  1184.   crc_offset = (crc_offset + 3) & ~3;
  1185.  
  1186.   crc32 = bfd_get_32 (abfd, contents + crc_offset);
  1187.  
  1188.   *crc32_out = crc32;
  1189.   return name;
  1190. }
  1191.  
  1192. /*
  1193. FUNCTION
  1194.         bfd_get_alt_debug_link_info
  1195.  
  1196. SYNOPSIS
  1197.         char *bfd_get_alt_debug_link_info (bfd *abfd, unsigned long *crc32_out);
  1198.  
  1199. DESCRIPTION
  1200.         Fetch the filename and BuildID value for any alternate debuginfo
  1201.         associated with @var{abfd}.  Return NULL if no such info found,
  1202.         otherwise return filename and update @var{buildid_out}.  The
  1203.         returned filename is allocated with @code{malloc}; freeing it
  1204.         is the responsibility of the caller.
  1205. */
  1206.  
  1207. char *
  1208. bfd_get_alt_debug_link_info (bfd * abfd, unsigned long * buildid_out)
  1209. {
  1210.   asection *sect;
  1211.   bfd_byte *contents;
  1212.   int buildid_offset;
  1213.   char *name;
  1214.  
  1215.   BFD_ASSERT (abfd);
  1216.   BFD_ASSERT (buildid_out);
  1217.  
  1218.   sect = bfd_get_section_by_name (abfd, GNU_DEBUGALTLINK);
  1219.  
  1220.   if (sect == NULL)
  1221.     return NULL;
  1222.  
  1223.   if (!bfd_malloc_and_get_section (abfd, sect, & contents))
  1224.     {
  1225.       if (contents != NULL)
  1226.         free (contents);
  1227.       return NULL;
  1228.     }
  1229.  
  1230.   /* BuildID value is stored after the filename, aligned up to 4 bytes.  */
  1231.   name = (char *) contents;
  1232.   buildid_offset = strlen (name) + 1;
  1233.   buildid_offset = (buildid_offset + 3) & ~3;
  1234.  
  1235.   * buildid_out = bfd_get_32 (abfd, contents + buildid_offset);
  1236.  
  1237.   return name;
  1238. }
  1239.  
  1240. /*
  1241. INTERNAL_FUNCTION
  1242.         separate_debug_file_exists
  1243.  
  1244. SYNOPSIS
  1245.         bfd_boolean separate_debug_file_exists
  1246.           (char *name, unsigned long crc32);
  1247.  
  1248. DESCRIPTION
  1249.         Checks to see if @var{name} is a file and if its contents
  1250.         match @var{crc32}.
  1251. */
  1252.  
  1253. static bfd_boolean
  1254. separate_debug_file_exists (const char *name, const unsigned long crc)
  1255. {
  1256.   static unsigned char buffer [8 * 1024];
  1257.   unsigned long file_crc = 0;
  1258.   FILE *f;
  1259.   bfd_size_type count;
  1260.  
  1261.   BFD_ASSERT (name);
  1262.  
  1263.   f = real_fopen (name, FOPEN_RB);
  1264.   if (f == NULL)
  1265.     return FALSE;
  1266.  
  1267.   while ((count = fread (buffer, 1, sizeof (buffer), f)) > 0)
  1268.     file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count);
  1269.  
  1270.   fclose (f);
  1271.  
  1272.   return crc == file_crc;
  1273. }
  1274.  
  1275. /*
  1276. INTERNAL_FUNCTION
  1277.         separate_alt_debug_file_exists
  1278.  
  1279. SYNOPSIS
  1280.         bfd_boolean separate_alt_debug_file_exists
  1281.           (char *name, unsigned long crc32);
  1282.  
  1283. DESCRIPTION
  1284.         Checks to see if @var{name} is a file and if its BuildID
  1285.         matches @var{buildid}.
  1286. */
  1287.  
  1288. static bfd_boolean
  1289. separate_alt_debug_file_exists (const char *name,
  1290.                                 const unsigned long buildid ATTRIBUTE_UNUSED)
  1291. {
  1292.   FILE *f;
  1293.  
  1294.   BFD_ASSERT (name);
  1295.  
  1296.   f = real_fopen (name, FOPEN_RB);
  1297.   if (f == NULL)
  1298.     return FALSE;
  1299.  
  1300.   /* FIXME: Add code to check buildid.  */
  1301.  
  1302.   fclose (f);
  1303.  
  1304.   return TRUE;
  1305. }
  1306.  
  1307. /*
  1308. INTERNAL_FUNCTION
  1309.         find_separate_debug_file
  1310.  
  1311. SYNOPSIS
  1312.         char *find_separate_debug_file (bfd *abfd);
  1313.  
  1314. DESCRIPTION
  1315.         Searches @var{abfd} for a section called @var{section_name} which
  1316.         is expected to contain a reference to a file containing separate
  1317.         debugging information.  The function scans various locations in
  1318.         the filesystem, including the file tree rooted at
  1319.         @var{debug_file_directory}, and returns the first matching
  1320.         filename that it finds.  If @var{check_crc} is TRUE then the
  1321.         contents of the file must also match the CRC value contained in
  1322.         @var{section_name}.  Returns NULL if no valid file could be found.
  1323. */
  1324.  
  1325. typedef char *      (* get_func_type) (bfd *, unsigned long *);
  1326. typedef bfd_boolean (* check_func_type) (const char *, const unsigned long);
  1327.  
  1328. static char *
  1329. find_separate_debug_file (bfd *           abfd,
  1330.                           const char *    debug_file_directory,
  1331.                           get_func_type   get_func,
  1332.                           check_func_type check_func)
  1333. {
  1334.   char *base;
  1335.   char *dir;
  1336.   char *debugfile;
  1337.   char *canon_dir;
  1338.   unsigned long crc32;
  1339.   size_t dirlen;
  1340.   size_t canon_dirlen;
  1341.  
  1342.   BFD_ASSERT (abfd);
  1343.   if (debug_file_directory == NULL)
  1344.     debug_file_directory = ".";
  1345.  
  1346.   /* BFD may have been opened from a stream.  */
  1347.   if (abfd->filename == NULL)
  1348.     {
  1349.       bfd_set_error (bfd_error_invalid_operation);
  1350.       return NULL;
  1351.     }
  1352.  
  1353.   base = get_func (abfd, & crc32);
  1354.    
  1355.   if (base == NULL)
  1356.     return NULL;
  1357.  
  1358.   if (base[0] == '\0')
  1359.     {
  1360.       free (base);
  1361.       bfd_set_error (bfd_error_no_debug_section);
  1362.       return NULL;
  1363.     }
  1364.  
  1365.   for (dirlen = strlen (abfd->filename); dirlen > 0; dirlen--)
  1366.     if (IS_DIR_SEPARATOR (abfd->filename[dirlen - 1]))
  1367.       break;
  1368.  
  1369.   dir = (char *) bfd_malloc (dirlen + 1);
  1370.   if (dir == NULL)
  1371.     {
  1372.       free (base);
  1373.       return NULL;
  1374.     }
  1375.   memcpy (dir, abfd->filename, dirlen);
  1376.   dir[dirlen] = '\0';
  1377.  
  1378.   /* Compute the canonical name of the bfd object with all symbolic links
  1379.      resolved, for use in the global debugfile directory.  */
  1380.   canon_dir = lrealpath (abfd->filename);
  1381.   for (canon_dirlen = strlen (canon_dir); canon_dirlen > 0; canon_dirlen--)
  1382.     if (IS_DIR_SEPARATOR (canon_dir[canon_dirlen - 1]))
  1383.       break;
  1384.   canon_dir[canon_dirlen] = '\0';
  1385.  
  1386.   debugfile = (char *)
  1387.       bfd_malloc (strlen (debug_file_directory) + 1
  1388.                   + (canon_dirlen > dirlen ? canon_dirlen : dirlen)
  1389.                   + strlen (".debug/")
  1390.                   + strlen (base)
  1391.                   + 1);
  1392.   if (debugfile == NULL)
  1393.     goto found; /* Actually this returns NULL.  */
  1394.  
  1395.   /* First try in the same directory as the original file:  */
  1396.   strcpy (debugfile, dir);
  1397.   strcat (debugfile, base);
  1398.  
  1399.   if (check_func (debugfile, crc32))
  1400.     goto found;
  1401.  
  1402.   /* Then try in a subdirectory called .debug.  */
  1403.   strcpy (debugfile, dir);
  1404.   strcat (debugfile, ".debug/");
  1405.   strcat (debugfile, base);
  1406.  
  1407.   if (check_func (debugfile, crc32))
  1408.     goto found;
  1409.  
  1410.   /* Then try in the global debugfile directory.  */
  1411.   strcpy (debugfile, debug_file_directory);
  1412.   dirlen = strlen (debug_file_directory) - 1;
  1413.   if (dirlen > 0
  1414.       && debug_file_directory[dirlen] != '/'
  1415.       && canon_dir[0] != '/')
  1416.     strcat (debugfile, "/");
  1417.   strcat (debugfile, canon_dir);
  1418.   strcat (debugfile, base);
  1419.  
  1420.   if (check_func (debugfile, crc32))
  1421.     goto found;
  1422.  
  1423.   /* Failed to find the file.  */
  1424.   free (debugfile);
  1425.   debugfile = NULL;
  1426.  
  1427.  found:
  1428.   free (base);
  1429.   free (dir);
  1430.   free (canon_dir);
  1431.   return debugfile;
  1432. }
  1433.  
  1434.  
  1435. /*
  1436. FUNCTION
  1437.         bfd_follow_gnu_debuglink
  1438.  
  1439. SYNOPSIS
  1440.         char *bfd_follow_gnu_debuglink (bfd *abfd, const char *dir);
  1441.  
  1442. DESCRIPTION
  1443.  
  1444.         Takes a BFD and searches it for a .gnu_debuglink section.  If this
  1445.         section is found, it examines the section for the name and checksum
  1446.         of a '.debug' file containing auxiliary debugging information.  It
  1447.         then searches the filesystem for this .debug file in some standard
  1448.         locations, including the directory tree rooted at @var{dir}, and if
  1449.         found returns the full filename.
  1450.  
  1451.         If @var{dir} is NULL, it will search a default path configured into
  1452.         libbfd at build time.  [XXX this feature is not currently
  1453.         implemented].
  1454.  
  1455. RETURNS
  1456.         <<NULL>> on any errors or failure to locate the .debug file,
  1457.         otherwise a pointer to a heap-allocated string containing the
  1458.         filename.  The caller is responsible for freeing this string.
  1459. */
  1460.  
  1461. char *
  1462. bfd_follow_gnu_debuglink (bfd *abfd, const char *dir)
  1463. {
  1464.   return find_separate_debug_file (abfd, dir,
  1465.                                    bfd_get_debug_link_info,
  1466.                                    separate_debug_file_exists);
  1467. }
  1468.  
  1469. /*
  1470. FUNCTION
  1471.         bfd_follow_gnu_debugaltlink
  1472.  
  1473. SYNOPSIS
  1474.         char *bfd_follow_gnu_debugaltlink (bfd *abfd, const char *dir);
  1475.  
  1476. DESCRIPTION
  1477.  
  1478.         Takes a BFD and searches it for a .gnu_debugaltlink section.  If this
  1479.         section is found, it examines the section for the name of a file
  1480.         containing auxiliary debugging information.  It then searches the
  1481.         filesystem for this file in a set of standard locations, including
  1482.         the directory tree rooted at @var{dir}, and if found returns the
  1483.         full filename.
  1484.  
  1485.         If @var{dir} is NULL, it will search a default path configured into
  1486.         libbfd at build time.  [FIXME: This feature is not currently
  1487.         implemented].
  1488.  
  1489. RETURNS
  1490.         <<NULL>> on any errors or failure to locate the debug file,
  1491.         otherwise a pointer to a heap-allocated string containing the
  1492.         filename.  The caller is responsible for freeing this string.
  1493. */
  1494.  
  1495. char *
  1496. bfd_follow_gnu_debugaltlink (bfd *abfd, const char *dir)
  1497. {
  1498.   return find_separate_debug_file (abfd, dir,
  1499.                                    bfd_get_alt_debug_link_info,
  1500.                                    separate_alt_debug_file_exists);
  1501. }
  1502.  
  1503. /*
  1504. FUNCTION
  1505.         bfd_create_gnu_debuglink_section
  1506.  
  1507. SYNOPSIS
  1508.         struct bfd_section *bfd_create_gnu_debuglink_section
  1509.           (bfd *abfd, const char *filename);
  1510.  
  1511. DESCRIPTION
  1512.  
  1513.         Takes a @var{BFD} and adds a .gnu_debuglink section to it.  The section is sized
  1514.         to be big enough to contain a link to the specified @var{filename}.
  1515.  
  1516. RETURNS
  1517.         A pointer to the new section is returned if all is ok.  Otherwise <<NULL>> is
  1518.         returned and bfd_error is set.
  1519. */
  1520.  
  1521. asection *
  1522. bfd_create_gnu_debuglink_section (bfd *abfd, const char *filename)
  1523. {
  1524.   asection *sect;
  1525.   bfd_size_type debuglink_size;
  1526.   flagword flags;
  1527.  
  1528.   if (abfd == NULL || filename == NULL)
  1529.     {
  1530.       bfd_set_error (bfd_error_invalid_operation);
  1531.       return NULL;
  1532.     }
  1533.  
  1534.   /* Strip off any path components in filename.  */
  1535.   filename = lbasename (filename);
  1536.  
  1537.   sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK);
  1538.   if (sect)
  1539.     {
  1540.       /* Section already exists.  */
  1541.       bfd_set_error (bfd_error_invalid_operation);
  1542.       return NULL;
  1543.     }
  1544.  
  1545.   flags = SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING;
  1546.   sect = bfd_make_section_with_flags (abfd, GNU_DEBUGLINK, flags);
  1547.   if (sect == NULL)
  1548.     return NULL;
  1549.  
  1550.   debuglink_size = strlen (filename) + 1;
  1551.   debuglink_size += 3;
  1552.   debuglink_size &= ~3;
  1553.   debuglink_size += 4;
  1554.  
  1555.   if (! bfd_set_section_size (abfd, sect, debuglink_size))
  1556.     /* XXX Should we delete the section from the bfd ?  */
  1557.     return NULL;
  1558.  
  1559.   return sect;
  1560. }
  1561.  
  1562.  
  1563. /*
  1564. FUNCTION
  1565.         bfd_fill_in_gnu_debuglink_section
  1566.  
  1567. SYNOPSIS
  1568.         bfd_boolean bfd_fill_in_gnu_debuglink_section
  1569.           (bfd *abfd, struct bfd_section *sect, const char *filename);
  1570.  
  1571. DESCRIPTION
  1572.  
  1573.         Takes a @var{BFD} and containing a .gnu_debuglink section @var{SECT}
  1574.         and fills in the contents of the section to contain a link to the
  1575.         specified @var{filename}.  The filename should be relative to the
  1576.         current directory.
  1577.  
  1578. RETURNS
  1579.         <<TRUE>> is returned if all is ok.  Otherwise <<FALSE>> is returned
  1580.         and bfd_error is set.
  1581. */
  1582.  
  1583. bfd_boolean
  1584. bfd_fill_in_gnu_debuglink_section (bfd *abfd,
  1585.                                    struct bfd_section *sect,
  1586.                                    const char *filename)
  1587. {
  1588.   bfd_size_type debuglink_size;
  1589.   unsigned long crc32;
  1590.   char * contents;
  1591.   bfd_size_type crc_offset;
  1592.   FILE * handle;
  1593.   static unsigned char buffer[8 * 1024];
  1594.   size_t count;
  1595.   size_t filelen;
  1596.  
  1597.   if (abfd == NULL || sect == NULL || filename == NULL)
  1598.     {
  1599.       bfd_set_error (bfd_error_invalid_operation);
  1600.       return FALSE;
  1601.     }
  1602.  
  1603.   /* Make sure that we can read the file.
  1604.      XXX - Should we attempt to locate the debug info file using the same
  1605.      algorithm as gdb ?  At the moment, since we are creating the
  1606.      .gnu_debuglink section, we insist upon the user providing us with a
  1607.      correct-for-section-creation-time path, but this need not conform to
  1608.      the gdb location algorithm.  */
  1609.   handle = real_fopen (filename, FOPEN_RB);
  1610.   if (handle == NULL)
  1611.     {
  1612.       bfd_set_error (bfd_error_system_call);
  1613.       return FALSE;
  1614.     }
  1615.  
  1616.   crc32 = 0;
  1617.   while ((count = fread (buffer, 1, sizeof buffer, handle)) > 0)
  1618.     crc32 = bfd_calc_gnu_debuglink_crc32 (crc32, buffer, count);
  1619.   fclose (handle);
  1620.  
  1621.   /* Strip off any path components in filename,
  1622.      now that we no longer need them.  */
  1623.   filename = lbasename (filename);
  1624.  
  1625.   filelen = strlen (filename);
  1626.   debuglink_size = filelen + 1;
  1627.   debuglink_size += 3;
  1628.   debuglink_size &= ~3;
  1629.   debuglink_size += 4;
  1630.  
  1631.   contents = (char *) bfd_malloc (debuglink_size);
  1632.   if (contents == NULL)
  1633.     {
  1634.       /* XXX Should we delete the section from the bfd ?  */
  1635.       return FALSE;
  1636.     }
  1637.  
  1638.   crc_offset = debuglink_size - 4;
  1639.   memcpy (contents, filename, filelen);
  1640.   memset (contents + filelen, 0, crc_offset - filelen);
  1641.  
  1642.   bfd_put_32 (abfd, crc32, contents + crc_offset);
  1643.  
  1644.   if (! bfd_set_section_contents (abfd, sect, contents, 0, debuglink_size))
  1645.     {
  1646.       /* XXX Should we delete the section from the bfd ?  */
  1647.       free (contents);
  1648.       return FALSE;
  1649.     }
  1650.  
  1651.   return TRUE;
  1652. }
  1653.