aboutsummaryrefslogtreecommitdiff
path: root/bfd/opncls.c
blob: ee8d152ceec862aee13a24e7c4d7609838b61301 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
/* opncls.c -- open and close a BFD.
   Copyright (C) 1990 91, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
   Written by Cygnus Support.

This file is part of BFD, the Binary File Descriptor library.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "obstack.h"

#ifndef S_IXUSR
#define S_IXUSR 0100	/* Execute by owner.  */
#endif
#ifndef S_IXGRP
#define S_IXGRP 0010	/* Execute by group.  */
#endif
#ifndef S_IXOTH
#define S_IXOTH 0001	/* Execute by others.  */
#endif

/* fdopen is a loser -- we should use stdio exclusively.  Unfortunately
   if we do that we can't use fcntl.  */


#define obstack_chunk_alloc malloc
#define obstack_chunk_free free

#ifndef HAVE_GETPAGESIZE
#define getpagesize()	2048
#endif

long _bfd_chunksize = -1;

/* Return a new BFD.  All BFD's are allocated through this routine.  */

bfd *
_bfd_new_bfd ()
{
  bfd *nbfd;

  nbfd = (bfd *)bfd_zmalloc (sizeof (bfd));
  if (!nbfd)
    return 0;

  if (_bfd_chunksize <= 0)
    {
      _bfd_chunksize = getpagesize ();
      if (_bfd_chunksize <= 0)
	_bfd_chunksize = 2048;
      /* Leave some slush space, since many malloc implementations
	 prepend a header, and may wind up wasting another page
	 because of it.  */
      _bfd_chunksize -= 32;
    }

  if (!obstack_begin(&nbfd->memory, _bfd_chunksize))
    {
      bfd_set_error (bfd_error_no_memory);
      return 0;
    }

  nbfd->arch_info = &bfd_default_arch_struct;

  nbfd->direction = no_direction;
  nbfd->iostream = NULL;
  nbfd->where = 0;
  nbfd->sections = (asection *)NULL;
  nbfd->format = bfd_unknown;
  nbfd->my_archive = (bfd *)NULL;
  nbfd->origin = 0;				
  nbfd->opened_once = false;
  nbfd->output_has_begun = false;
  nbfd->section_count = 0;
  nbfd->usrdata = (PTR)NULL;
  nbfd->cacheable = false;
  nbfd->flags = BFD_NO_FLAGS;
  nbfd->mtime_set = false;

  return nbfd;
}

/* Allocate a new BFD as a member of archive OBFD.  */

bfd *
_bfd_new_bfd_contained_in (obfd)
     bfd *obfd;
{
  bfd *nbfd;

  nbfd = _bfd_new_bfd();
  nbfd->xvec = obfd->xvec;
  nbfd->my_archive = obfd;
  nbfd->direction = read_direction;
  nbfd->target_defaulted = obfd->target_defaulted;
  return nbfd;
}

/*
SECTION
	Opening and closing BFDs

*/

/*
FUNCTION
	bfd_openr

SYNOPSIS
        bfd *bfd_openr(CONST char *filename, CONST char *target);

DESCRIPTION
	Open the file @var{filename} (using <<fopen>>) with the target
	@var{target}.  Return a pointer to the created BFD.

	Calls <<bfd_find_target>>, so @var{target} is interpreted as by
	that function.

	If <<NULL>> is returned then an error has occured.   Possible errors
	are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> or <<system_call>> error.
*/

bfd *
bfd_openr (filename, target)
     CONST char *filename;
     CONST char *target;
{
  bfd *nbfd;
  const bfd_target *target_vec;

  nbfd = _bfd_new_bfd();
  if (nbfd == NULL)
    return NULL;

  target_vec = bfd_find_target (target, nbfd);
  if (target_vec == NULL) {
    bfd_set_error (bfd_error_invalid_target);
    return NULL;
  }

  nbfd->filename = filename;
  nbfd->direction = read_direction;

  if (bfd_open_file (nbfd) == NULL) {
    bfd_set_error (bfd_error_system_call);	/* File didn't exist, or some such */
    bfd_release(nbfd,0);
    return NULL;
  }
  return nbfd;
}


/* Don't try to `optimize' this function:

   o - We lock using stack space so that interrupting the locking
       won't cause a storage leak.
   o - We open the file stream last, since we don't want to have to
       close it if anything goes wrong.  Closing the stream means closing
       the file descriptor too, even though we didn't open it.
 */
/*
FUNCTION
         bfd_fdopenr

SYNOPSIS
         bfd *bfd_fdopenr(CONST char *filename, CONST char *target, int fd);

DESCRIPTION
         <<bfd_fdopenr>> is to <<bfd_fopenr>> much like <<fdopen>> is to <<fopen>>.
	 It opens a BFD on a file already described by the @var{fd}
	 supplied.

	 When the file is later <<bfd_close>>d, the file descriptor will be closed.

	 If the caller desires that this file descriptor be cached by BFD
	 (opened as needed, closed as needed to free descriptors for
	 other opens), with the supplied @var{fd} used as an initial
	 file descriptor (but subject to closure at any time), call
	 bfd_set_cacheable(bfd, 1) on the returned BFD.  The default is to
	 assume no cacheing; the file descriptor will remain open until
	 <<bfd_close>>, and will not be affected by BFD operations on other
	 files.

         Possible errors are <<bfd_error_no_memory>>, <<bfd_error_invalid_target>> and <<bfd_error_system_call>>.
*/

bfd *
bfd_fdopenr (filename, target, fd)
     CONST char *filename;
     CONST char *target;
     int fd;
{
  bfd *nbfd;
  const bfd_target *target_vec;
  int fdflags;

  bfd_set_error (bfd_error_system_call);
#if ! defined(HAVE_FCNTL) || ! defined(F_GETFL)
  fdflags = O_RDWR;			/* Assume full access */
#else
  fdflags = fcntl (fd, F_GETFL, NULL);
#endif
  if (fdflags == -1) return NULL;

  nbfd = _bfd_new_bfd();

  if (nbfd == NULL)
    return NULL;

  target_vec = bfd_find_target (target, nbfd);
  if (target_vec == NULL) {
    bfd_set_error (bfd_error_invalid_target);
    return NULL;
  }
#if defined(VMS) || defined(__GO32__) || defined (WINGDB)
  nbfd->iostream = (PTR)fopen(filename, FOPEN_RB);
#else
  /* (O_ACCMODE) parens are to avoid Ultrix header file bug */
  switch (fdflags & (O_ACCMODE)) {
  case O_RDONLY: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RB);   break;
  case O_WRONLY: nbfd->iostream = (PTR) fdopen (fd, FOPEN_RUB);  break;
  case O_RDWR:   nbfd->iostream = (PTR) fdopen (fd, FOPEN_RUB);  break;
  default: abort ();
  }
#endif
  if (nbfd->iostream == NULL) {
    (void) obstack_free (&nbfd->memory, (PTR)0);
    return NULL;
  }

  /* OK, put everything where it belongs */

  nbfd->filename = filename;

  /* As a special case we allow a FD open for read/write to
     be written through, although doing so requires that we end
     the previous clause with a preposition.  */
  /* (O_ACCMODE) parens are to avoid Ultrix header file bug */
  switch (fdflags & (O_ACCMODE)) {
  case O_RDONLY: nbfd->direction = read_direction; break;
  case O_WRONLY: nbfd->direction = write_direction; break;
  case O_RDWR: nbfd->direction = both_direction; break;
  default: abort ();
  }
				
  if (! bfd_cache_init (nbfd))
    return NULL;
  nbfd->opened_once = true;

  return nbfd;
}

/*
FUNCTION
	bfd_openstreamr

SYNOPSIS
	bfd *bfd_openstreamr();

DESCRIPTION

	Open a BFD for read access on an existing stdio stream.  When
	the BFD is passed to <<bfd_close>>, the stream will be closed.
*/

bfd *
bfd_openstreamr (filename, target, stream)
     const char *filename;
     const char *target;
     FILE *stream;
{
  bfd *nbfd;
  const bfd_target *target_vec;

  nbfd = _bfd_new_bfd ();
  if (nbfd == NULL)
    return NULL;

  target_vec = bfd_find_target (target, nbfd);
  if (target_vec == NULL)
    {
      bfd_set_error (bfd_error_invalid_target);
      return NULL;
    }

  nbfd->iostream = (PTR) stream;
  nbfd->filename = filename;
  nbfd->direction = read_direction;
				
  if (! bfd_cache_init (nbfd))
    return NULL;

  return nbfd;
}

/** bfd_openw -- open for writing.
  Returns a pointer to a freshly-allocated BFD on success, or NULL.

  See comment by bfd_fdopenr before you try to modify this function. */

/*
FUNCTION
	bfd_openw

SYNOPSIS
	bfd *bfd_openw(CONST char *filename, CONST char *target);

DESCRIPTION
	Create a BFD, associated with file @var{filename}, using the
	file format @var{target}, and return a pointer to it.

	Possible errors are <<bfd_error_system_call>>, <<bfd_error_no_memory>>,
	<<bfd_error_invalid_target>>.
*/

bfd *
bfd_openw (filename, target)
     CONST char *filename;
     CONST char *target;
{
  bfd *nbfd;
  const bfd_target *target_vec;

  bfd_set_error (bfd_error_system_call);

  /* nbfd has to point to head of malloc'ed block so that bfd_close may
     reclaim it correctly. */

  nbfd = _bfd_new_bfd();
  if (nbfd == NULL)
    return NULL;

  target_vec = bfd_find_target (target, nbfd);
  if (target_vec == NULL) return NULL;

  nbfd->filename = filename;
  nbfd->direction = write_direction;

  if (bfd_open_file (nbfd) == NULL) {
    bfd_set_error (bfd_error_system_call);	/* File not writeable, etc */
    (void) obstack_free (&nbfd->memory, (PTR)0);
    return NULL;
  }
  return nbfd;
}

/*

FUNCTION
	bfd_close

SYNOPSIS
	boolean bfd_close(bfd *abfd);

DESCRIPTION

	Close a BFD. If the BFD was open for writing,
	then pending operations are completed and the file written out
	and closed. If the created file is executable, then
	<<chmod>> is called to mark it as such.

	All memory attached to the BFD's obstacks is released.

	The file descriptor associated with the BFD is closed (even
	if it was passed in to BFD by <<bfd_fdopenr>>).

RETURNS
	<<true>> is returned if all is ok, otherwise <<false>>.
*/


boolean
bfd_close (abfd)
     bfd *abfd;
{
  boolean ret;

  if (!bfd_read_p (abfd))
    {
      if (! BFD_SEND_FMT (abfd, _bfd_write_contents, (abfd)))
	return false;
    }

  if (! BFD_SEND (abfd, _close_and_cleanup, (abfd)))
    return false;

  ret = bfd_cache_close (abfd);

  /* If the file was open for writing and is now executable,
     make it so */
  if (ret
      && abfd->direction == write_direction
      && abfd->flags & EXEC_P)
    {
      struct stat buf;

      if (stat (abfd->filename, &buf) == 0)
	{
 	  int mask = umask (0);
	  umask (mask);
	  chmod (abfd->filename,
		 (0777
		  & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask))));
	}
    }

  (void) obstack_free (&abfd->memory, (PTR)0);
  (void) free (abfd);

  return ret;
}

/*
FUNCTION
	bfd_close_all_done

SYNOPSIS
	boolean bfd_close_all_done(bfd *);

DESCRIPTION
	Close a BFD.  Differs from <<bfd_close>>
	since it does not complete any pending operations.  This
	routine would be used if the application had just used BFD for
	swapping and didn't want to use any of the writing code.

	If the created file is executable, then <<chmod>> is called
	to mark it as such.

	All memory attached to the BFD's obstacks is released.

RETURNS
	<<true>> is returned if all is ok, otherwise <<false>>.

*/

boolean
bfd_close_all_done (abfd)
     bfd *abfd;
{
  boolean ret;

  ret = bfd_cache_close (abfd);

  /* If the file was open for writing and is now executable,
     make it so */
  if (ret
      && abfd->direction == write_direction
      && abfd->flags & EXEC_P)
    {
      struct stat buf;

      if (stat (abfd->filename, &buf) == 0)
	{
	  int mask = umask (0);
	  umask (mask);
	  chmod (abfd->filename,
		 (0x777
		  & (buf.st_mode | ((S_IXUSR | S_IXGRP | S_IXOTH) &~ mask))));
	}
    }
  (void) obstack_free (&abfd->memory, (PTR)0);
  (void) free(abfd);
  return ret;
}


/*
FUNCTION	
	bfd_alloc_size

SYNOPSIS
	bfd_size_type bfd_alloc_size(bfd *abfd);

DESCRIPTION
        Return the number of bytes in the obstacks connected to @var{abfd}.

*/

bfd_size_type
bfd_alloc_size (abfd)
     bfd *abfd;
{
  struct _obstack_chunk *chunk = abfd->memory.chunk;
  size_t size = 0;
  while (chunk) {
    size += chunk->limit - &(chunk->contents[0]);
    chunk = chunk->prev;
  }
  return size;
}



/*
FUNCTION
	bfd_create

SYNOPSIS
	bfd *bfd_create(CONST char *filename, bfd *templ);

DESCRIPTION
	Create a new BFD in the manner of
	<<bfd_openw>>, but without opening a file. The new BFD
	takes the target from the target used by @var{template}. The
	format is always set to <<bfd_object>>.

*/

bfd *
bfd_create (filename, templ)
     CONST char *filename;
     bfd *templ;
{
  bfd *nbfd = _bfd_new_bfd();
  if (nbfd == (bfd *)NULL)
    return (bfd *)NULL;
  nbfd->filename = filename;
  if(templ) {
    nbfd->xvec = templ->xvec;
  }
  nbfd->direction = no_direction;
  bfd_set_format(nbfd, bfd_object);
  return nbfd;
}

/*
INTERNAL_FUNCTION
	bfd_alloc_by_size_t

SYNOPSIS
	PTR bfd_alloc_by_size_t(bfd *abfd, size_t wanted);

DESCRIPTION
	Allocate a block of @var{wanted} bytes of memory in the obstack
	attatched to <<abfd>> and return a pointer to it.
*/


PTR
bfd_alloc_by_size_t (abfd, size)
     bfd *abfd;
     size_t size;
{
  PTR ret;

  ret = obstack_alloc (&(abfd->memory), size);
  if (ret == NULL)
    bfd_set_error (bfd_error_no_memory);
  return ret;
}

void
bfd_alloc_grow (abfd, ptr, size)
     bfd *abfd;
     PTR ptr;
     size_t size;
{
  (void) obstack_grow(&(abfd->memory), ptr, size);
}

PTR
bfd_alloc_finish (abfd)
     bfd *abfd;
{
  PTR ret;

  ret = obstack_finish (&(abfd->memory));
  if (ret == NULL)
    bfd_set_error (bfd_error_no_memory);
  return ret;
}

PTR
bfd_alloc (abfd, size)
     bfd *abfd;
     size_t size;
{
  return bfd_alloc_by_size_t(abfd, (size_t)size);
}

PTR
bfd_zalloc (abfd, size)
     bfd *abfd;
     size_t size;
{
  PTR res;
  res = bfd_alloc(abfd, size);
  if (res)
    memset(res, 0, (size_t)size);
  return res;
}