PR ld/14323
[deliverable/binutils-gdb.git] / bfd / opncls.c
... / ...
CommitLineData
1/* opncls.c -- open and close a BFD.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012
4 Free Software Foundation, Inc.
5
6 Written by Cygnus Support.
7
8 This file is part of BFD, the Binary File Descriptor library.
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
23 MA 02110-1301, USA. */
24
25#include "sysdep.h"
26#include "bfd.h"
27#include "objalloc.h"
28#include "libbfd.h"
29#include "libiberty.h"
30
31#ifndef S_IXUSR
32#define S_IXUSR 0100 /* Execute by owner. */
33#endif
34#ifndef S_IXGRP
35#define S_IXGRP 0010 /* Execute by group. */
36#endif
37#ifndef S_IXOTH
38#define S_IXOTH 0001 /* Execute by others. */
39#endif
40
41/* Counters used to initialize the bfd identifier. */
42
43static unsigned int bfd_id_counter = 0;
44static unsigned int bfd_reserved_id_counter = 0;
45
46/*
47CODE_FRAGMENT
48.{* Set to N to open the next N BFDs using an alternate id space. *}
49.extern unsigned int bfd_use_reserved_id;
50*/
51unsigned int bfd_use_reserved_id = 0;
52
53/* fdopen is a loser -- we should use stdio exclusively. Unfortunately
54 if we do that we can't use fcntl. */
55
56/* Return a new BFD. All BFD's are allocated through this routine. */
57
58bfd *
59_bfd_new_bfd (void)
60{
61 bfd *nbfd;
62
63 nbfd = (bfd *) bfd_zmalloc (sizeof (bfd));
64 if (nbfd == NULL)
65 return NULL;
66
67 if (bfd_use_reserved_id)
68 {
69 nbfd->id = --bfd_reserved_id_counter;
70 --bfd_use_reserved_id;
71 }
72 else
73 nbfd->id = bfd_id_counter++;
74
75 nbfd->memory = objalloc_create ();
76 if (nbfd->memory == NULL)
77 {
78 bfd_set_error (bfd_error_no_memory);
79 free (nbfd);
80 return NULL;
81 }
82
83 nbfd->arch_info = &bfd_default_arch_struct;
84
85 nbfd->direction = no_direction;
86 nbfd->iostream = NULL;
87 nbfd->where = 0;
88 if (!bfd_hash_table_init_n (& nbfd->section_htab, bfd_section_hash_newfunc,
89 sizeof (struct section_hash_entry), 251))
90 {
91 free (nbfd);
92 return NULL;
93 }
94 nbfd->sections = NULL;
95 nbfd->section_last = NULL;
96 nbfd->format = bfd_unknown;
97 nbfd->my_archive = NULL;
98 nbfd->origin = 0;
99 nbfd->opened_once = FALSE;
100 nbfd->output_has_begun = FALSE;
101 nbfd->section_count = 0;
102 nbfd->usrdata = NULL;
103 nbfd->cacheable = FALSE;
104 nbfd->flags = BFD_NO_FLAGS;
105 nbfd->mtime_set = FALSE;
106
107 return nbfd;
108}
109
110/* Allocate a new BFD as a member of archive OBFD. */
111
112bfd *
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 nbfd->my_archive = obfd;
123 nbfd->direction = read_direction;
124 nbfd->target_defaulted = obfd->target_defaulted;
125 return nbfd;
126}
127
128/* Delete a BFD. */
129
130void
131_bfd_delete_bfd (bfd *abfd)
132{
133 if (abfd->memory)
134 {
135 bfd_hash_table_free (&abfd->section_htab);
136 objalloc_free ((struct objalloc *) abfd->memory);
137 }
138 free (abfd);
139}
140
141/* Free objalloc memory. */
142
143bfd_boolean
144_bfd_free_cached_info (bfd *abfd)
145{
146 if (abfd->memory)
147 {
148 bfd_hash_table_free (&abfd->section_htab);
149 objalloc_free ((struct objalloc *) abfd->memory);
150
151 abfd->sections = NULL;
152 abfd->section_last = NULL;
153 abfd->outsymbols = NULL;
154 abfd->tdata.any = NULL;
155 abfd->usrdata = NULL;
156 abfd->memory = NULL;
157 }
158
159 return TRUE;
160}
161
162/*
163SECTION
164 Opening and closing BFDs
165
166SUBSECTION
167 Functions for opening and closing
168*/
169
170/*
171FUNCTION
172 bfd_fopen
173
174SYNOPSIS
175 bfd *bfd_fopen (const char *filename, const char *target,
176 const char *mode, int fd);
177
178DESCRIPTION
179 Open the file @var{filename} with the target @var{target}.
180 Return a pointer to the created BFD. If @var{fd} is not -1,
181 then <<fdopen>> is used to open the file; otherwise, <<fopen>>
182 is used. @var{mode} is passed directly to <<fopen>> or
183 <<fdopen>>.
184
185 Calls <<bfd_find_target>>, so @var{target} is interpreted as by
186 that function.
187
188 The new BFD is marked as cacheable iff @var{fd} is -1.
189
190 If <<NULL>> is returned then an error has occured. Possible errors
191 are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or
192 <<system_call>> error.
193
194 On error, @var{fd} is always closed.
195*/
196
197bfd *
198bfd_fopen (const char *filename, const char *target, const char *mode, int fd)
199{
200 bfd *nbfd;
201 const bfd_target *target_vec;
202
203 nbfd = _bfd_new_bfd ();
204 if (nbfd == NULL)
205 {
206 if (fd != -1)
207 close (fd);
208 return NULL;
209 }
210
211 target_vec = bfd_find_target (target, nbfd);
212 if (target_vec == NULL)
213 {
214 if (fd != -1)
215 close (fd);
216 _bfd_delete_bfd (nbfd);
217 return NULL;
218 }
219
220#ifdef HAVE_FDOPEN
221 if (fd != -1)
222 nbfd->iostream = fdopen (fd, mode);
223 else
224#endif
225 nbfd->iostream = real_fopen (filename, mode);
226 if (nbfd->iostream == NULL)
227 {
228 bfd_set_error (bfd_error_system_call);
229 _bfd_delete_bfd (nbfd);
230 return NULL;
231 }
232
233 /* OK, put everything where it belongs. */
234 nbfd->filename = filename;
235
236 /* Figure out whether the user is opening the file for reading,
237 writing, or both, by looking at the MODE argument. */
238 if ((mode[0] == 'r' || mode[0] == 'w' || mode[0] == 'a')
239 && mode[1] == '+')
240 nbfd->direction = both_direction;
241 else if (mode[0] == 'r')
242 nbfd->direction = read_direction;
243 else
244 nbfd->direction = write_direction;
245
246 if (! bfd_cache_init (nbfd))
247 {
248 _bfd_delete_bfd (nbfd);
249 return NULL;
250 }
251 nbfd->opened_once = TRUE;
252 /* If we opened the file by name, mark it cacheable; we can close it
253 and reopen it later. However, if a file descriptor was provided,
254 then it may have been opened with special flags that make it
255 unsafe to close and reopen the file. */
256 if (fd == -1)
257 bfd_set_cacheable (nbfd, TRUE);
258
259 return nbfd;
260}
261
262/*
263FUNCTION
264 bfd_openr
265
266SYNOPSIS
267 bfd *bfd_openr (const char *filename, const char *target);
268
269DESCRIPTION
270 Open the file @var{filename} (using <<fopen>>) with the target
271 @var{target}. Return a pointer to the created BFD.
272
273 Calls <<bfd_find_target>>, so @var{target} is interpreted as by
274 that function.
275
276 If <<NULL>> is returned then an error has occured. Possible errors
277 are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or
278 <<system_call>> error.
279*/
280
281bfd *
282bfd_openr (const char *filename, const char *target)
283{
284 return bfd_fopen (filename, target, FOPEN_RB, -1);
285}
286
287/* Don't try to `optimize' this function:
288
289 o - We lock using stack space so that interrupting the locking
290 won't cause a storage leak.
291 o - We open the file stream last, since we don't want to have to
292 close it if anything goes wrong. Closing the stream means closing
293 the file descriptor too, even though we didn't open it. */
294/*
295FUNCTION
296 bfd_fdopenr
297
298SYNOPSIS
299 bfd *bfd_fdopenr (const char *filename, const char *target, int fd);
300
301DESCRIPTION
302 <<bfd_fdopenr>> is to <<bfd_fopenr>> much like <<fdopen>> is to
303 <<fopen>>. It opens a BFD on a file already described by the
304 @var{fd} supplied.
305
306 When the file is later <<bfd_close>>d, the file descriptor will
307 be closed. If the caller desires that this file descriptor be
308 cached by BFD (opened as needed, closed as needed to free
309 descriptors for other opens), with the supplied @var{fd} used as
310 an initial file descriptor (but subject to closure at any time),
311 call bfd_set_cacheable(bfd, 1) on the returned BFD. The default
312 is to assume no caching; the file descriptor will remain open
313 until <<bfd_close>>, and will not be affected by BFD operations
314 on other files.
315
316 Possible errors are <<bfd_error_no_memory>>,
317 <<bfd_error_invalid_target>> and <<bfd_error_system_call>>.
318
319 On error, @var{fd} is closed.
320*/
321
322bfd *
323bfd_fdopenr (const char *filename, const char *target, int fd)
324{
325 const char *mode;
326#if defined(HAVE_FCNTL) && defined(F_GETFL)
327 int fdflags;
328#endif
329
330#if ! defined(HAVE_FCNTL) || ! defined(F_GETFL)
331 mode = FOPEN_RUB; /* Assume full access. */
332#else
333 fdflags = fcntl (fd, F_GETFL, NULL);
334 if (fdflags == -1)
335 {
336 int save = errno;
337
338 close (fd);
339 errno = save;
340 bfd_set_error (bfd_error_system_call);
341 return NULL;
342 }
343
344 /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */
345 switch (fdflags & (O_ACCMODE))
346 {
347 case O_RDONLY: mode = FOPEN_RB; break;
348 case O_WRONLY: mode = FOPEN_RUB; break;
349 case O_RDWR: mode = FOPEN_RUB; break;
350 default: abort ();
351 }
352#endif
353
354 return bfd_fopen (filename, target, mode, fd);
355}
356
357/*
358FUNCTION
359 bfd_openstreamr
360
361SYNOPSIS
362 bfd *bfd_openstreamr (const char *, const char *, void *);
363
364DESCRIPTION
365
366 Open a BFD for read access on an existing stdio stream. When
367 the BFD is passed to <<bfd_close>>, the stream will be closed.
368*/
369
370bfd *
371bfd_openstreamr (const char *filename, const char *target, void *streamarg)
372{
373 FILE *stream = (FILE *) streamarg;
374 bfd *nbfd;
375 const bfd_target *target_vec;
376
377 nbfd = _bfd_new_bfd ();
378 if (nbfd == NULL)
379 return NULL;
380
381 target_vec = bfd_find_target (target, nbfd);
382 if (target_vec == NULL)
383 {
384 _bfd_delete_bfd (nbfd);
385 return NULL;
386 }
387
388 nbfd->iostream = stream;
389 nbfd->filename = filename;
390 nbfd->direction = read_direction;
391
392 if (! bfd_cache_init (nbfd))
393 {
394 _bfd_delete_bfd (nbfd);
395 return NULL;
396 }
397
398 return nbfd;
399}
400
401/*
402FUNCTION
403 bfd_openr_iovec
404
405SYNOPSIS
406 bfd *bfd_openr_iovec (const char *filename, const char *target,
407 void *(*open_func) (struct bfd *nbfd,
408 void *open_closure),
409 void *open_closure,
410 file_ptr (*pread_func) (struct bfd *nbfd,
411 void *stream,
412 void *buf,
413 file_ptr nbytes,
414 file_ptr offset),
415 int (*close_func) (struct bfd *nbfd,
416 void *stream),
417 int (*stat_func) (struct bfd *abfd,
418 void *stream,
419 struct stat *sb));
420
421DESCRIPTION
422
423 Create and return a BFD backed by a read-only @var{stream}.
424 The @var{stream} is created using @var{open_func}, accessed using
425 @var{pread_func} and destroyed using @var{close_func}.
426
427 Calls <<bfd_find_target>>, so @var{target} is interpreted as by
428 that function.
429
430 Calls @var{open_func} (which can call <<bfd_zalloc>> and
431 <<bfd_get_filename>>) to obtain the read-only stream backing
432 the BFD. @var{open_func} either succeeds returning the
433 non-<<NULL>> @var{stream}, or fails returning <<NULL>>
434 (setting <<bfd_error>>).
435
436 Calls @var{pread_func} to request @var{nbytes} of data from
437 @var{stream} starting at @var{offset} (e.g., via a call to
438 <<bfd_read>>). @var{pread_func} either succeeds returning the
439 number of bytes read (which can be less than @var{nbytes} when
440 end-of-file), or fails returning -1 (setting <<bfd_error>>).
441
442 Calls @var{close_func} when the BFD is later closed using
443 <<bfd_close>>. @var{close_func} either succeeds returning 0, or
444 fails returning -1 (setting <<bfd_error>>).
445
446 Calls @var{stat_func} to fill in a stat structure for bfd_stat,
447 bfd_get_size, and bfd_get_mtime calls. @var{stat_func} returns 0
448 on success, or returns -1 on failure (setting <<bfd_error>>).
449
450 If <<bfd_openr_iovec>> returns <<NULL>> then an error has
451 occurred. Possible errors are <<bfd_error_no_memory>>,
452 <<bfd_error_invalid_target>> and <<bfd_error_system_call>>.
453
454*/
455
456struct opncls
457{
458 void *stream;
459 file_ptr (*pread) (struct bfd *abfd, void *stream, void *buf,
460 file_ptr nbytes, file_ptr offset);
461 int (*close) (struct bfd *abfd, void *stream);
462 int (*stat) (struct bfd *abfd, void *stream, struct stat *sb);
463 file_ptr where;
464};
465
466static file_ptr
467opncls_btell (struct bfd *abfd)
468{
469 struct opncls *vec = (struct opncls *) abfd->iostream;
470 return vec->where;
471}
472
473static int
474opncls_bseek (struct bfd *abfd, file_ptr offset, int whence)
475{
476 struct opncls *vec = (struct opncls *) abfd->iostream;
477 switch (whence)
478 {
479 case SEEK_SET: vec->where = offset; break;
480 case SEEK_CUR: vec->where += offset; break;
481 case SEEK_END: return -1;
482 }
483 return 0;
484}
485
486static file_ptr
487opncls_bread (struct bfd *abfd, void *buf, file_ptr nbytes)
488{
489 struct opncls *vec = (struct opncls *) abfd->iostream;
490 file_ptr nread = (vec->pread) (abfd, vec->stream, buf, nbytes, vec->where);
491 if (nread < 0)
492 return nread;
493 vec->where += nread;
494 return nread;
495}
496
497static file_ptr
498opncls_bwrite (struct bfd *abfd ATTRIBUTE_UNUSED,
499 const void *where ATTRIBUTE_UNUSED,
500 file_ptr nbytes ATTRIBUTE_UNUSED)
501{
502 return -1;
503}
504
505static int
506opncls_bclose (struct bfd *abfd)
507{
508 struct opncls *vec = (struct opncls *) abfd->iostream;
509 /* Since the VEC's memory is bound to the bfd deleting the bfd will
510 free it. */
511 int status = 0;
512 if (vec->close != NULL)
513 status = (vec->close) (abfd, vec->stream);
514 abfd->iostream = NULL;
515 return status;
516}
517
518static int
519opncls_bflush (struct bfd *abfd ATTRIBUTE_UNUSED)
520{
521 return 0;
522}
523
524static int
525opncls_bstat (struct bfd *abfd, struct stat *sb)
526{
527 struct opncls *vec = (struct opncls *) abfd->iostream;
528
529 memset (sb, 0, sizeof (*sb));
530 if (vec->stat == NULL)
531 return 0;
532
533 return (vec->stat) (abfd, vec->stream, sb);
534}
535
536static void *
537opncls_bmmap (struct bfd *abfd ATTRIBUTE_UNUSED,
538 void *addr ATTRIBUTE_UNUSED,
539 bfd_size_type len ATTRIBUTE_UNUSED,
540 int prot ATTRIBUTE_UNUSED,
541 int flags ATTRIBUTE_UNUSED,
542 file_ptr offset ATTRIBUTE_UNUSED,
543 void **map_addr ATTRIBUTE_UNUSED,
544 bfd_size_type *map_len ATTRIBUTE_UNUSED)
545{
546 return (void *) -1;
547}
548
549static const struct bfd_iovec opncls_iovec = {
550 &opncls_bread, &opncls_bwrite, &opncls_btell, &opncls_bseek,
551 &opncls_bclose, &opncls_bflush, &opncls_bstat, &opncls_bmmap
552};
553
554bfd *
555bfd_openr_iovec (const char *filename, const char *target,
556 void *(*open_p) (struct bfd *, void *),
557 void *open_closure,
558 file_ptr (*pread_p) (struct bfd *, void *, void *,
559 file_ptr, file_ptr),
560 int (*close_p) (struct bfd *, void *),
561 int (*stat_p) (struct bfd *, void *, struct stat *))
562{
563 bfd *nbfd;
564 const bfd_target *target_vec;
565 struct opncls *vec;
566 void *stream;
567
568 nbfd = _bfd_new_bfd ();
569 if (nbfd == NULL)
570 return NULL;
571
572 target_vec = bfd_find_target (target, nbfd);
573 if (target_vec == NULL)
574 {
575 _bfd_delete_bfd (nbfd);
576 return NULL;
577 }
578
579 nbfd->filename = filename;
580 nbfd->direction = read_direction;
581
582 /* `open_p (...)' would get expanded by an the open(2) syscall macro. */
583 stream = (*open_p) (nbfd, open_closure);
584 if (stream == NULL)
585 {
586 _bfd_delete_bfd (nbfd);
587 return NULL;
588 }
589
590 vec = (struct opncls *) bfd_zalloc (nbfd, sizeof (struct opncls));
591 vec->stream = stream;
592 vec->pread = pread_p;
593 vec->close = close_p;
594 vec->stat = stat_p;
595
596 nbfd->iovec = &opncls_iovec;
597 nbfd->iostream = vec;
598
599 return nbfd;
600}
601\f
602/* bfd_openw -- open for writing.
603 Returns a pointer to a freshly-allocated BFD on success, or NULL.
604
605 See comment by bfd_fdopenr before you try to modify this function. */
606
607/*
608FUNCTION
609 bfd_openw
610
611SYNOPSIS
612 bfd *bfd_openw (const char *filename, const char *target);
613
614DESCRIPTION
615 Create a BFD, associated with file @var{filename}, using the
616 file format @var{target}, and return a pointer to it.
617
618 Possible errors are <<bfd_error_system_call>>, <<bfd_error_no_memory>>,
619 <<bfd_error_invalid_target>>.
620*/
621
622bfd *
623bfd_openw (const char *filename, const char *target)
624{
625 bfd *nbfd;
626 const bfd_target *target_vec;
627
628 /* nbfd has to point to head of malloc'ed block so that bfd_close may
629 reclaim it correctly. */
630 nbfd = _bfd_new_bfd ();
631 if (nbfd == NULL)
632 return NULL;
633
634 target_vec = bfd_find_target (target, nbfd);
635 if (target_vec == NULL)
636 {
637 _bfd_delete_bfd (nbfd);
638 return NULL;
639 }
640
641 nbfd->filename = filename;
642 nbfd->direction = write_direction;
643
644 if (bfd_open_file (nbfd) == NULL)
645 {
646 /* File not writeable, etc. */
647 bfd_set_error (bfd_error_system_call);
648 _bfd_delete_bfd (nbfd);
649 return NULL;
650 }
651
652 return nbfd;
653}
654
655static inline void
656_maybe_make_executable (bfd * abfd)
657{
658 /* If the file was open for writing and is now executable,
659 make it so. */
660 if (abfd->direction == write_direction
661 && (abfd->flags & (EXEC_P | DYNAMIC)) != 0)
662 {
663 struct stat buf;
664
665 if (stat (abfd->filename, &buf) == 0
666 /* Do not attempt to change non-regular files. This is
667 here especially for configure scripts and kernel builds
668 which run tests with "ld [...] -o /dev/null". */
669 && S_ISREG(buf.st_mode))
670 {
671 unsigned int mask = umask (0);
672
673 umask (mask);
674 chmod (abfd->filename,
675 (0777
676 & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask))));
677 }
678 }
679}
680
681/*
682
683FUNCTION
684 bfd_close
685
686SYNOPSIS
687 bfd_boolean bfd_close (bfd *abfd);
688
689DESCRIPTION
690
691 Close a BFD. If the BFD was open for writing, then pending
692 operations are completed and the file written out and closed.
693 If the created file is executable, then <<chmod>> is called
694 to mark it as such.
695
696 All memory attached to the BFD is released.
697
698 The file descriptor associated with the BFD is closed (even
699 if it was passed in to BFD by <<bfd_fdopenr>>).
700
701RETURNS
702 <<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
703*/
704
705
706bfd_boolean
707bfd_close (bfd *abfd)
708{
709 bfd_boolean ret;
710 bfd *nbfd;
711 bfd *next;
712
713 if (bfd_write_p (abfd))
714 {
715 if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)))
716 return FALSE;
717 }
718
719 /* Close nested archives (if this bfd is a thin archive). */
720 for (nbfd = abfd->nested_archives; nbfd; nbfd = next)
721 {
722 next = nbfd->archive_next;
723 bfd_close (nbfd);
724 }
725
726 if (! BFD_SEND (abfd, _close_and_cleanup, (abfd)))
727 return FALSE;
728
729 ret = abfd->iovec->bclose (abfd);
730
731 if (ret)
732 _maybe_make_executable (abfd);
733
734 _bfd_delete_bfd (abfd);
735
736 return ret;
737}
738
739/*
740FUNCTION
741 bfd_close_all_done
742
743SYNOPSIS
744 bfd_boolean bfd_close_all_done (bfd *);
745
746DESCRIPTION
747 Close a BFD. Differs from <<bfd_close>> since it does not
748 complete any pending operations. This routine would be used
749 if the application had just used BFD for swapping and didn't
750 want to use any of the writing code.
751
752 If the created file is executable, then <<chmod>> is called
753 to mark it as such.
754
755 All memory attached to the BFD is released.
756
757RETURNS
758 <<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
759*/
760
761bfd_boolean
762bfd_close_all_done (bfd *abfd)
763{
764 bfd_boolean ret;
765
766 ret = bfd_cache_close (abfd);
767
768 if (ret)
769 _maybe_make_executable (abfd);
770
771 _bfd_delete_bfd (abfd);
772
773 return ret;
774}
775
776/*
777FUNCTION
778 bfd_create
779
780SYNOPSIS
781 bfd *bfd_create (const char *filename, bfd *templ);
782
783DESCRIPTION
784 Create a new BFD in the manner of <<bfd_openw>>, but without
785 opening a file. The new BFD takes the target from the target
786 used by @var{templ}. The format is always set to <<bfd_object>>.
787*/
788
789bfd *
790bfd_create (const char *filename, bfd *templ)
791{
792 bfd *nbfd;
793
794 nbfd = _bfd_new_bfd ();
795 if (nbfd == NULL)
796 return NULL;
797 nbfd->filename = filename;
798 if (templ)
799 nbfd->xvec = templ->xvec;
800 nbfd->direction = no_direction;
801 bfd_set_format (nbfd, bfd_object);
802
803 return nbfd;
804}
805
806/*
807FUNCTION
808 bfd_make_writable
809
810SYNOPSIS
811 bfd_boolean bfd_make_writable (bfd *abfd);
812
813DESCRIPTION
814 Takes a BFD as created by <<bfd_create>> and converts it
815 into one like as returned by <<bfd_openw>>. It does this
816 by converting the BFD to BFD_IN_MEMORY. It's assumed that
817 you will call <<bfd_make_readable>> on this bfd later.
818
819RETURNS
820 <<TRUE>> is returned if all is ok, otherwise <<FALSE>>.
821*/
822
823bfd_boolean
824bfd_make_writable (bfd *abfd)
825{
826 struct bfd_in_memory *bim;
827
828 if (abfd->direction != no_direction)
829 {
830 bfd_set_error (bfd_error_invalid_operation);
831 return FALSE;
832 }
833
834 bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory));
835 if (bim == NULL)
836 return FALSE; /* bfd_error already set. */
837 abfd->iostream = bim;
838 /* bfd_bwrite will grow these as needed. */
839 bim->size = 0;
840 bim->buffer = 0;
841
842 abfd->flags |= BFD_IN_MEMORY;
843 abfd->iovec = &_bfd_memory_iovec;
844 abfd->origin = 0;
845 abfd->direction = write_direction;
846 abfd->where = 0;
847
848 return TRUE;
849}
850
851/*
852FUNCTION
853 bfd_make_readable
854
855SYNOPSIS
856 bfd_boolean bfd_make_readable (bfd *abfd);
857
858DESCRIPTION
859 Takes a BFD as created by <<bfd_create>> and
860 <<bfd_make_writable>> and converts it into one like as
861 returned by <<bfd_openr>>. It does this by writing the
862 contents out to the memory buffer, then reversing the
863 direction.
864
865RETURNS
866 <<TRUE>> is returned if all is ok, otherwise <<FALSE>>. */
867
868bfd_boolean
869bfd_make_readable (bfd *abfd)
870{
871 if (abfd->direction != write_direction || !(abfd->flags & BFD_IN_MEMORY))
872 {
873 bfd_set_error (bfd_error_invalid_operation);
874 return FALSE;
875 }
876
877 if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)))
878 return FALSE;
879
880 if (! BFD_SEND (abfd, _close_and_cleanup, (abfd)))
881 return FALSE;
882
883 abfd->arch_info = &bfd_default_arch_struct;
884
885 abfd->where = 0;
886 abfd->format = bfd_unknown;
887 abfd->my_archive = NULL;
888 abfd->origin = 0;
889 abfd->opened_once = FALSE;
890 abfd->output_has_begun = FALSE;
891 abfd->section_count = 0;
892 abfd->usrdata = NULL;
893 abfd->cacheable = FALSE;
894 abfd->flags |= BFD_IN_MEMORY;
895 abfd->mtime_set = FALSE;
896
897 abfd->target_defaulted = TRUE;
898 abfd->direction = read_direction;
899 abfd->sections = 0;
900 abfd->symcount = 0;
901 abfd->outsymbols = 0;
902 abfd->tdata.any = 0;
903
904 bfd_section_list_clear (abfd);
905 bfd_check_format (abfd, bfd_object);
906
907 return TRUE;
908}
909
910/*
911FUNCTION
912 bfd_alloc
913
914SYNOPSIS
915 void *bfd_alloc (bfd *abfd, bfd_size_type wanted);
916
917DESCRIPTION
918 Allocate a block of @var{wanted} bytes of memory attached to
919 <<abfd>> and return a pointer to it.
920*/
921
922void *
923bfd_alloc (bfd *abfd, bfd_size_type size)
924{
925 void *ret;
926
927 if (size != (unsigned long) size)
928 {
929 bfd_set_error (bfd_error_no_memory);
930 return NULL;
931 }
932
933 ret = objalloc_alloc ((struct objalloc *) abfd->memory, (unsigned long) size);
934 if (ret == NULL)
935 bfd_set_error (bfd_error_no_memory);
936 return ret;
937}
938
939/*
940INTERNAL_FUNCTION
941 bfd_alloc2
942
943SYNOPSIS
944 void *bfd_alloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size);
945
946DESCRIPTION
947 Allocate a block of @var{nmemb} elements of @var{size} bytes each
948 of memory attached to <<abfd>> and return a pointer to it.
949*/
950
951void *
952bfd_alloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size)
953{
954 void *ret;
955
956 if ((nmemb | size) >= HALF_BFD_SIZE_TYPE
957 && size != 0
958 && nmemb > ~(bfd_size_type) 0 / size)
959 {
960 bfd_set_error (bfd_error_no_memory);
961 return NULL;
962 }
963
964 size *= nmemb;
965
966 if (size != (unsigned long) size)
967 {
968 bfd_set_error (bfd_error_no_memory);
969 return NULL;
970 }
971
972 ret = objalloc_alloc ((struct objalloc *) abfd->memory, (unsigned long) size);
973 if (ret == NULL)
974 bfd_set_error (bfd_error_no_memory);
975 return ret;
976}
977
978/*
979FUNCTION
980 bfd_zalloc
981
982SYNOPSIS
983 void *bfd_zalloc (bfd *abfd, bfd_size_type wanted);
984
985DESCRIPTION
986 Allocate a block of @var{wanted} bytes of zeroed memory
987 attached to <<abfd>> and return a pointer to it.
988*/
989
990void *
991bfd_zalloc (bfd *abfd, bfd_size_type size)
992{
993 void *res;
994
995 res = bfd_alloc (abfd, size);
996 if (res)
997 memset (res, 0, (size_t) size);
998 return res;
999}
1000
1001/*
1002INTERNAL_FUNCTION
1003 bfd_zalloc2
1004
1005SYNOPSIS
1006 void *bfd_zalloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size);
1007
1008DESCRIPTION
1009 Allocate a block of @var{nmemb} elements of @var{size} bytes each
1010 of zeroed memory attached to <<abfd>> and return a pointer to it.
1011*/
1012
1013void *
1014bfd_zalloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size)
1015{
1016 void *res;
1017
1018 if ((nmemb | size) >= HALF_BFD_SIZE_TYPE
1019 && size != 0
1020 && nmemb > ~(bfd_size_type) 0 / size)
1021 {
1022 bfd_set_error (bfd_error_no_memory);
1023 return NULL;
1024 }
1025
1026 size *= nmemb;
1027
1028 res = bfd_alloc (abfd, size);
1029 if (res)
1030 memset (res, 0, (size_t) size);
1031 return res;
1032}
1033
1034/* Free a block allocated for a BFD.
1035 Note: Also frees all more recently allocated blocks! */
1036
1037void
1038bfd_release (bfd *abfd, void *block)
1039{
1040 objalloc_free_block ((struct objalloc *) abfd->memory, block);
1041}
1042
1043
1044/*
1045 GNU Extension: separate debug-info files
1046
1047 The idea here is that a special section called .gnu_debuglink might be
1048 embedded in a binary file, which indicates that some *other* file
1049 contains the real debugging information. This special section contains a
1050 filename and CRC32 checksum, which we read and resolve to another file,
1051 if it exists.
1052
1053 This facilitates "optional" provision of debugging information, without
1054 having to provide two complete copies of every binary object (with and
1055 without debug symbols).
1056*/
1057
1058#define GNU_DEBUGLINK ".gnu_debuglink"
1059/*
1060FUNCTION
1061 bfd_calc_gnu_debuglink_crc32
1062
1063SYNOPSIS
1064 unsigned long bfd_calc_gnu_debuglink_crc32
1065 (unsigned long crc, const unsigned char *buf, bfd_size_type len);
1066
1067DESCRIPTION
1068 Computes a CRC value as used in the .gnu_debuglink section.
1069 Advances the previously computed @var{crc} value by computing
1070 and adding in the crc32 for @var{len} bytes of @var{buf}.
1071
1072RETURNS
1073 Return the updated CRC32 value.
1074*/
1075
1076unsigned long
1077bfd_calc_gnu_debuglink_crc32 (unsigned long crc,
1078 const unsigned char *buf,
1079 bfd_size_type len)
1080{
1081 static const unsigned long crc32_table[256] =
1082 {
1083 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
1084 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
1085 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
1086 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
1087 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
1088 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
1089 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
1090 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
1091 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
1092 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
1093 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
1094 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
1095 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
1096 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
1097 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
1098 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
1099 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
1100 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
1101 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
1102 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
1103 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
1104 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
1105 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
1106 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
1107 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
1108 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
1109 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
1110 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
1111 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
1112 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
1113 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
1114 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
1115 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
1116 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
1117 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
1118 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
1119 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
1120 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
1121 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
1122 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
1123 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
1124 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
1125 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
1126 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
1127 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
1128 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
1129 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
1130 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
1131 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
1132 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
1133 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
1134 0x2d02ef8d
1135 };
1136 const unsigned char *end;
1137
1138 crc = ~crc & 0xffffffff;
1139 for (end = buf + len; buf < end; ++ buf)
1140 crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
1141 return ~crc & 0xffffffff;;
1142}
1143
1144
1145/*
1146INTERNAL_FUNCTION
1147 get_debug_link_info
1148
1149SYNOPSIS
1150 char *get_debug_link_info (bfd *abfd, unsigned long *crc32_out);
1151
1152DESCRIPTION
1153 fetch the filename and CRC32 value for any separate debuginfo
1154 associated with @var{abfd}. Return NULL if no such info found,
1155 otherwise return filename and update @var{crc32_out}.
1156*/
1157
1158static char *
1159get_debug_link_info (bfd *abfd, unsigned long *crc32_out)
1160{
1161 asection *sect;
1162 unsigned long crc32;
1163 bfd_byte *contents;
1164 int crc_offset;
1165 char *name;
1166
1167 BFD_ASSERT (abfd);
1168 BFD_ASSERT (crc32_out);
1169
1170 sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK);
1171
1172 if (sect == NULL)
1173 return NULL;
1174
1175 if (!bfd_malloc_and_get_section (abfd, sect, &contents))
1176 {
1177 if (contents != NULL)
1178 free (contents);
1179 return NULL;
1180 }
1181
1182 /* Crc value is stored after the filename, aligned up to 4 bytes. */
1183 name = (char *) contents;
1184 crc_offset = strlen (name) + 1;
1185 crc_offset = (crc_offset + 3) & ~3;
1186
1187 crc32 = bfd_get_32 (abfd, contents + crc_offset);
1188
1189 *crc32_out = crc32;
1190 return name;
1191}
1192
1193/*
1194INTERNAL_FUNCTION
1195 separate_debug_file_exists
1196
1197SYNOPSIS
1198 bfd_boolean separate_debug_file_exists
1199 (char *name, unsigned long crc32);
1200
1201DESCRIPTION
1202 Checks to see if @var{name} is a file and if its contents
1203 match @var{crc32}.
1204*/
1205
1206static bfd_boolean
1207separate_debug_file_exists (const char *name, const unsigned long crc)
1208{
1209 static unsigned char buffer [8 * 1024];
1210 unsigned long file_crc = 0;
1211 FILE *f;
1212 bfd_size_type count;
1213
1214 BFD_ASSERT (name);
1215
1216 f = real_fopen (name, FOPEN_RB);
1217 if (f == NULL)
1218 return FALSE;
1219
1220 while ((count = fread (buffer, 1, sizeof (buffer), f)) > 0)
1221 file_crc = bfd_calc_gnu_debuglink_crc32 (file_crc, buffer, count);
1222
1223 fclose (f);
1224
1225 return crc == file_crc;
1226}
1227
1228
1229/*
1230INTERNAL_FUNCTION
1231 find_separate_debug_file
1232
1233SYNOPSIS
1234 char *find_separate_debug_file (bfd *abfd);
1235
1236DESCRIPTION
1237 Searches @var{abfd} for a reference to separate debugging
1238 information, scans various locations in the filesystem, including
1239 the file tree rooted at @var{debug_file_directory}, and returns a
1240 filename of such debugging information if the file is found and has
1241 matching CRC32. Returns NULL if no reference to debugging file
1242 exists, or file cannot be found.
1243*/
1244
1245static char *
1246find_separate_debug_file (bfd *abfd, const char *debug_file_directory)
1247{
1248 char *base;
1249 char *dir;
1250 char *debugfile;
1251 char *canon_dir;
1252 unsigned long crc32;
1253 size_t dirlen;
1254 size_t canon_dirlen;
1255
1256 BFD_ASSERT (abfd);
1257 if (debug_file_directory == NULL)
1258 debug_file_directory = ".";
1259
1260 /* BFD may have been opened from a stream. */
1261 if (abfd->filename == NULL)
1262 {
1263 bfd_set_error (bfd_error_invalid_operation);
1264 return NULL;
1265 }
1266
1267 base = get_debug_link_info (abfd, & crc32);
1268 if (base == NULL)
1269 return NULL;
1270
1271 if (base[0] == '\0')
1272 {
1273 free (base);
1274 bfd_set_error (bfd_error_no_debug_section);
1275 return NULL;
1276 }
1277
1278 for (dirlen = strlen (abfd->filename); dirlen > 0; dirlen--)
1279 if (IS_DIR_SEPARATOR (abfd->filename[dirlen - 1]))
1280 break;
1281
1282 dir = (char *) bfd_malloc (dirlen + 1);
1283 if (dir == NULL)
1284 {
1285 free (base);
1286 return NULL;
1287 }
1288 memcpy (dir, abfd->filename, dirlen);
1289 dir[dirlen] = '\0';
1290
1291 /* Compute the canonical name of the bfd object with all symbolic links
1292 resolved, for use in the global debugfile directory. */
1293 canon_dir = lrealpath (abfd->filename);
1294 for (canon_dirlen = strlen (canon_dir); canon_dirlen > 0; canon_dirlen--)
1295 if (IS_DIR_SEPARATOR (canon_dir[canon_dirlen - 1]))
1296 break;
1297 canon_dir[canon_dirlen] = '\0';
1298
1299 debugfile = (char *)
1300 bfd_malloc (strlen (debug_file_directory) + 1
1301 + (canon_dirlen > dirlen ? canon_dirlen : dirlen)
1302 + strlen (".debug/")
1303 + strlen (base)
1304 + 1);
1305 if (debugfile == NULL)
1306 {
1307 free (base);
1308 free (dir);
1309 free (canon_dir);
1310 return NULL;
1311 }
1312
1313 /* First try in the same directory as the original file: */
1314 strcpy (debugfile, dir);
1315 strcat (debugfile, base);
1316
1317 if (separate_debug_file_exists (debugfile, crc32))
1318 {
1319 free (base);
1320 free (dir);
1321 free (canon_dir);
1322 return debugfile;
1323 }
1324
1325 /* Then try in a subdirectory called .debug. */
1326 strcpy (debugfile, dir);
1327 strcat (debugfile, ".debug/");
1328 strcat (debugfile, base);
1329
1330 if (separate_debug_file_exists (debugfile, crc32))
1331 {
1332 free (base);
1333 free (dir);
1334 free (canon_dir);
1335 return debugfile;
1336 }
1337
1338 /* Then try in the global debugfile directory. */
1339 strcpy (debugfile, debug_file_directory);
1340 dirlen = strlen (debug_file_directory) - 1;
1341 if (dirlen > 0
1342 && debug_file_directory[dirlen] != '/'
1343 && canon_dir[0] != '/')
1344 strcat (debugfile, "/");
1345 strcat (debugfile, canon_dir);
1346 strcat (debugfile, base);
1347
1348 if (separate_debug_file_exists (debugfile, crc32))
1349 {
1350 free (base);
1351 free (dir);
1352 free (canon_dir);
1353 return debugfile;
1354 }
1355
1356 free (debugfile);
1357 free (base);
1358 free (dir);
1359 free (canon_dir);
1360 return NULL;
1361}
1362
1363
1364/*
1365FUNCTION
1366 bfd_follow_gnu_debuglink
1367
1368SYNOPSIS
1369 char *bfd_follow_gnu_debuglink (bfd *abfd, const char *dir);
1370
1371DESCRIPTION
1372
1373 Takes a BFD and searches it for a .gnu_debuglink section. If this
1374 section is found, it examines the section for the name and checksum
1375 of a '.debug' file containing auxiliary debugging information. It
1376 then searches the filesystem for this .debug file in some standard
1377 locations, including the directory tree rooted at @var{dir}, and if
1378 found returns the full filename.
1379
1380 If @var{dir} is NULL, it will search a default path configured into
1381 libbfd at build time. [XXX this feature is not currently
1382 implemented].
1383
1384RETURNS
1385 <<NULL>> on any errors or failure to locate the .debug file,
1386 otherwise a pointer to a heap-allocated string containing the
1387 filename. The caller is responsible for freeing this string.
1388*/
1389
1390char *
1391bfd_follow_gnu_debuglink (bfd *abfd, const char *dir)
1392{
1393 return find_separate_debug_file (abfd, dir);
1394}
1395
1396/*
1397FUNCTION
1398 bfd_create_gnu_debuglink_section
1399
1400SYNOPSIS
1401 struct bfd_section *bfd_create_gnu_debuglink_section
1402 (bfd *abfd, const char *filename);
1403
1404DESCRIPTION
1405
1406 Takes a @var{BFD} and adds a .gnu_debuglink section to it. The section is sized
1407 to be big enough to contain a link to the specified @var{filename}.
1408
1409RETURNS
1410 A pointer to the new section is returned if all is ok. Otherwise <<NULL>> is
1411 returned and bfd_error is set.
1412*/
1413
1414asection *
1415bfd_create_gnu_debuglink_section (bfd *abfd, const char *filename)
1416{
1417 asection *sect;
1418 bfd_size_type debuglink_size;
1419 flagword flags;
1420
1421 if (abfd == NULL || filename == NULL)
1422 {
1423 bfd_set_error (bfd_error_invalid_operation);
1424 return NULL;
1425 }
1426
1427 /* Strip off any path components in filename. */
1428 filename = lbasename (filename);
1429
1430 sect = bfd_get_section_by_name (abfd, GNU_DEBUGLINK);
1431 if (sect)
1432 {
1433 /* Section already exists. */
1434 bfd_set_error (bfd_error_invalid_operation);
1435 return NULL;
1436 }
1437
1438 flags = SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING;
1439 sect = bfd_make_section_with_flags (abfd, GNU_DEBUGLINK, flags);
1440 if (sect == NULL)
1441 return NULL;
1442
1443 debuglink_size = strlen (filename) + 1;
1444 debuglink_size += 3;
1445 debuglink_size &= ~3;
1446 debuglink_size += 4;
1447
1448 if (! bfd_set_section_size (abfd, sect, debuglink_size))
1449 /* XXX Should we delete the section from the bfd ? */
1450 return NULL;
1451
1452 return sect;
1453}
1454
1455
1456/*
1457FUNCTION
1458 bfd_fill_in_gnu_debuglink_section
1459
1460SYNOPSIS
1461 bfd_boolean bfd_fill_in_gnu_debuglink_section
1462 (bfd *abfd, struct bfd_section *sect, const char *filename);
1463
1464DESCRIPTION
1465
1466 Takes a @var{BFD} and containing a .gnu_debuglink section @var{SECT}
1467 and fills in the contents of the section to contain a link to the
1468 specified @var{filename}. The filename should be relative to the
1469 current directory.
1470
1471RETURNS
1472 <<TRUE>> is returned if all is ok. Otherwise <<FALSE>> is returned
1473 and bfd_error is set.
1474*/
1475
1476bfd_boolean
1477bfd_fill_in_gnu_debuglink_section (bfd *abfd,
1478 struct bfd_section *sect,
1479 const char *filename)
1480{
1481 bfd_size_type debuglink_size;
1482 unsigned long crc32;
1483 char * contents;
1484 bfd_size_type crc_offset;
1485 FILE * handle;
1486 static unsigned char buffer[8 * 1024];
1487 size_t count;
1488 size_t filelen;
1489
1490 if (abfd == NULL || sect == NULL || filename == NULL)
1491 {
1492 bfd_set_error (bfd_error_invalid_operation);
1493 return FALSE;
1494 }
1495
1496 /* Make sure that we can read the file.
1497 XXX - Should we attempt to locate the debug info file using the same
1498 algorithm as gdb ? At the moment, since we are creating the
1499 .gnu_debuglink section, we insist upon the user providing us with a
1500 correct-for-section-creation-time path, but this need not conform to
1501 the gdb location algorithm. */
1502 handle = real_fopen (filename, FOPEN_RB);
1503 if (handle == NULL)
1504 {
1505 bfd_set_error (bfd_error_system_call);
1506 return FALSE;
1507 }
1508
1509 crc32 = 0;
1510 while ((count = fread (buffer, 1, sizeof buffer, handle)) > 0)
1511 crc32 = bfd_calc_gnu_debuglink_crc32 (crc32, buffer, count);
1512 fclose (handle);
1513
1514 /* Strip off any path components in filename,
1515 now that we no longer need them. */
1516 filename = lbasename (filename);
1517
1518 filelen = strlen (filename);
1519 debuglink_size = filelen + 1;
1520 debuglink_size += 3;
1521 debuglink_size &= ~3;
1522 debuglink_size += 4;
1523
1524 contents = (char *) bfd_malloc (debuglink_size);
1525 if (contents == NULL)
1526 {
1527 /* XXX Should we delete the section from the bfd ? */
1528 return FALSE;
1529 }
1530
1531 crc_offset = debuglink_size - 4;
1532 memcpy (contents, filename, filelen);
1533 memset (contents + filelen, 0, crc_offset - filelen);
1534
1535 bfd_put_32 (abfd, crc32, contents + crc_offset);
1536
1537 if (! bfd_set_section_contents (abfd, sect, contents, 0, debuglink_size))
1538 {
1539 /* XXX Should we delete the section from the bfd ? */
1540 free (contents);
1541 return FALSE;
1542 }
1543
1544 return TRUE;
1545}
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