aboutsummaryrefslogtreecommitdiff
path: root/bfd/stabs.c
blob: e225d9cd60d7ef70a82cfd701ca0992161cd6fe7 (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
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
/* Stabs in sections linking support.
   Copyright 1996, 1997, 1998, 1999, 2000, 2001
   Free Software Foundation, Inc.
   Written by Ian Lance Taylor, 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.  */

/* This file contains support for linking stabs in sections, as used
   on COFF and ELF.  */

#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "aout/stab_gnu.h"
#include "safe-ctype.h"

/* Stabs entries use a 12 byte format:
     4 byte string table index
     1 byte stab type
     1 byte stab other field
     2 byte stab desc field
     4 byte stab value
   FIXME: This will have to change for a 64 bit object format.

   The stabs symbols are divided into compilation units.  For the
   first entry in each unit, the type of 0, the value is the length of
   the string table for this unit, and the desc field is the number of
   stabs symbols for this unit.  */

#define STRDXOFF (0)
#define TYPEOFF (4)
#define OTHEROFF (5)
#define DESCOFF (6)
#define VALOFF (8)
#define STABSIZE (12)

/* A hash table used for header files with N_BINCL entries.  */

struct stab_link_includes_table
{
  struct bfd_hash_table root;
};

/* A linked list of totals that we have found for a particular header
   file.  */

struct stab_link_includes_totals
{
  struct stab_link_includes_totals *next;
  bfd_vma total;
};

/* An entry in the header file hash table.  */

struct stab_link_includes_entry
{
  struct bfd_hash_entry root;
  /* List of totals we have found for this file.  */
  struct stab_link_includes_totals *totals;
};

/* Look up an entry in an the header file hash table.  */

#define stab_link_includes_lookup(table, string, create, copy) \
  ((struct stab_link_includes_entry *) \
   bfd_hash_lookup (&(table)->root, (string), (create), (copy)))

/* This structure is used to hold a list of N_BINCL symbols, some of
   which might be converted into N_EXCL symbols.  */

struct stab_excl_list
{
  /* The next symbol to convert.  */
  struct stab_excl_list *next;
  /* The offset to this symbol in the section contents.  */
  bfd_size_type offset;
  /* The value to use for the symbol.  */
  bfd_vma val;
  /* The type of this symbol (N_BINCL or N_EXCL).  */
  int type;
};

/* This structure is stored with each .stab section.  */

struct stab_section_info
{
  /* This is a linked list of N_BINCL symbols which should be
     converted into N_EXCL symbols.  */
  struct stab_excl_list *excls;

  /* This is used to map input stab offsets within their sections
     to output stab offsets, to take into account stabs that have
     been deleted.  If it is NULL, the output offsets are the same
     as the input offsets, because no stabs have been deleted from
     this section.  Otherwise the i'th entry is the number of
     bytes of stabs that have been deleted prior to the i'th
     stab.  */
  bfd_size_type *cumulative_skips;

  /* This is an array of string indices.  For each stab symbol, we
     store the string index here.  If a stab symbol should not be
     included in the final output, the string index is -1.  */
  bfd_size_type stridxs[1];
};

/* This structure is used to keep track of stabs in sections
   information while linking.  */

struct stab_info
{
  /* A hash table used to hold stabs strings.  */
  struct bfd_strtab_hash *strings;
  /* The header file hash table.  */
  struct stab_link_includes_table includes;
  /* The first .stabstr section.  */
  asection *stabstr;
};

static struct bfd_hash_entry *stab_link_includes_newfunc
  PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));

/* The function to create a new entry in the header file hash table.  */

static struct bfd_hash_entry *
stab_link_includes_newfunc (entry, table, string)
     struct bfd_hash_entry *entry;
     struct bfd_hash_table *table;
     const char *string;
{
  struct stab_link_includes_entry *ret =
    (struct stab_link_includes_entry *) entry;

  /* Allocate the structure if it has not already been allocated by a
     subclass.  */
  if (ret == (struct stab_link_includes_entry *) NULL)
    ret = ((struct stab_link_includes_entry *)
	   bfd_hash_allocate (table,
			      sizeof (struct stab_link_includes_entry)));
  if (ret == (struct stab_link_includes_entry *) NULL)
    return (struct bfd_hash_entry *) ret;

  /* Call the allocation method of the superclass.  */
  ret = ((struct stab_link_includes_entry *)
	 bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string));
  if (ret)
    {
      /* Set local fields.  */
      ret->totals = NULL;
    }

  return (struct bfd_hash_entry *) ret;
}

/* This function is called for each input file from the add_symbols
   pass of the linker.  */

boolean
_bfd_link_section_stabs (abfd, psinfo, stabsec, stabstrsec, psecinfo)
     bfd *abfd;
     PTR *psinfo;
     asection *stabsec;
     asection *stabstrsec;
     PTR *psecinfo;
{
  boolean first;
  struct stab_info *sinfo;
  bfd_size_type count, amt;
  struct stab_section_info *secinfo;
  bfd_byte *stabbuf = NULL;
  bfd_byte *stabstrbuf = NULL;
  bfd_byte *sym, *symend;
  bfd_size_type stroff, next_stroff, skip;
  bfd_size_type *pstridx;

  if (stabsec->_raw_size == 0
      || stabstrsec->_raw_size == 0)
    {
      /* This file does not contain stabs debugging information.  */
      return true;
    }

  if (stabsec->_raw_size % STABSIZE != 0)
    {
      /* Something is wrong with the format of these stab symbols.
         Don't try to optimize them.  */
      return true;
    }

  if ((stabstrsec->flags & SEC_RELOC) != 0)
    {
      /* We shouldn't see relocations in the strings, and we aren't
         prepared to handle them.  */
      return true;
    }

  if ((stabsec->output_section != NULL
       && bfd_is_abs_section (stabsec->output_section))
      || (stabstrsec->output_section != NULL
	  && bfd_is_abs_section (stabstrsec->output_section)))
    {
      /* At least one of the sections is being discarded from the
         link, so we should just ignore them.  */
      return true;
    }

  first = false;

  if (*psinfo == NULL)
    {
      /* Initialize the stabs information we need to keep track of.  */
      first = true;
      amt = sizeof (struct stab_info);
      *psinfo = (PTR) bfd_alloc (abfd, amt);
      if (*psinfo == NULL)
	goto error_return;
      sinfo = (struct stab_info *) *psinfo;
      sinfo->strings = _bfd_stringtab_init ();
      if (sinfo->strings == NULL)
	goto error_return;
      /* Make sure the first byte is zero.  */
      (void) _bfd_stringtab_add (sinfo->strings, "", true, true);
      if (! bfd_hash_table_init_n (&sinfo->includes.root,
				   stab_link_includes_newfunc,
				   251))
	goto error_return;
      sinfo->stabstr = bfd_make_section_anyway (abfd, ".stabstr");
      sinfo->stabstr->flags |= SEC_HAS_CONTENTS | SEC_READONLY | SEC_DEBUGGING;
    }

  sinfo = (struct stab_info *) *psinfo;

  /* Initialize the information we are going to store for this .stab
     section.  */

  count = stabsec->_raw_size / STABSIZE;

  amt = sizeof (struct stab_section_info);
  amt += (count - 1) * sizeof (bfd_size_type);
  *psecinfo = bfd_alloc (abfd, amt);
  if (*psecinfo == NULL)
    goto error_return;

  secinfo = (struct stab_section_info *) *psecinfo;
  secinfo->excls = NULL;
  secinfo->cumulative_skips = NULL;
  memset (secinfo->stridxs, 0, (size_t) count * sizeof (bfd_size_type));

  /* Read the stabs information from abfd.  */

  stabbuf = (bfd_byte *) bfd_malloc (stabsec->_raw_size);
  stabstrbuf = (bfd_byte *) bfd_malloc (stabstrsec->_raw_size);
  if (stabbuf == NULL || stabstrbuf == NULL)
    goto error_return;

  if (! bfd_get_section_contents (abfd, stabsec, stabbuf, (bfd_vma) 0,
				  stabsec->_raw_size)
      || ! bfd_get_section_contents (abfd, stabstrsec, stabstrbuf, (bfd_vma) 0,
				     stabstrsec->_raw_size))
    goto error_return;

  /* Look through the stabs symbols, work out the new string indices,
     and identify N_BINCL symbols which can be eliminated.  */

  stroff = 0;
  next_stroff = 0;
  skip = 0;

  symend = stabbuf + stabsec->_raw_size;
  for (sym = stabbuf, pstridx = secinfo->stridxs;
       sym < symend;
       sym += STABSIZE, ++pstridx)
    {
      bfd_size_type symstroff;
      int type;
      const char *string;

      if (*pstridx != 0)
	{
	  /* This symbol has already been handled by an N_BINCL pass.  */
	  continue;
	}

      type = sym[TYPEOFF];

      if (type == 0)
	{
	  /* Special type 0 stabs indicate the offset to the next
             string table.  We only copy the very first one.  */
	  stroff = next_stroff;
	  next_stroff += bfd_get_32 (abfd, sym + 8);
	  if (! first)
	    {
	      *pstridx = (bfd_size_type) -1;
	      ++skip;
	      continue;
	    }
	  first = false;
	}

      /* Store the string in the hash table, and record the index.  */
      symstroff = stroff + bfd_get_32 (abfd, sym + STRDXOFF);
      if (symstroff >= stabstrsec->_raw_size)
	{
	  (*_bfd_error_handler)
	    (_("%s(%s+0x%lx): Stabs entry has invalid string index."),
	     bfd_archive_filename (abfd),
	     bfd_get_section_name (abfd, stabsec),
	     (long) (sym - stabbuf));
	  bfd_set_error (bfd_error_bad_value);
	  goto error_return;
	}
      string = (char *) stabstrbuf + symstroff;
      *pstridx = _bfd_stringtab_add (sinfo->strings, string, true, true);

      /* An N_BINCL symbol indicates the start of the stabs entries
	 for a header file.  We need to scan ahead to the next N_EINCL
	 symbol, ignoring nesting, adding up all the characters in the
	 symbol names, not including the file numbers in types (the
	 first number after an open parenthesis).  */
      if (type == N_BINCL)
	{
	  bfd_vma val;
	  int nest;
	  bfd_byte *incl_sym;
	  struct stab_link_includes_entry *incl_entry;
	  struct stab_link_includes_totals *t;
	  struct stab_excl_list *ne;

	  val = 0;
	  nest = 0;
	  for (incl_sym = sym + STABSIZE;
	       incl_sym < symend;
	       incl_sym += STABSIZE)
	    {
	      int incl_type;

	      incl_type = incl_sym[TYPEOFF];
	      if (incl_type == 0)
		break;
	      else if (incl_type == N_EINCL)
		{
		  if (nest == 0)
		    break;
		  --nest;
		}
	      else if (incl_type == N_BINCL)
		++nest;
	      else if (nest == 0)
		{
		  const char *str;

		  str = ((char *) stabstrbuf
			 + stroff
			 + bfd_get_32 (abfd, incl_sym + STRDXOFF));
		  for (; *str != '\0'; str++)
		    {
		      val += *str;
		      if (*str == '(')
			{
			  /* Skip the file number.  */
			  ++str;
			  while (ISDIGIT (*str))
			    ++str;
			  --str;
			}
		    }
		}
	    }

	  /* If we have already included a header file with the same
	     value, then replaced this one with an N_EXCL symbol.  */
	  incl_entry = stab_link_includes_lookup (&sinfo->includes, string,
						  true, true);
	  if (incl_entry == NULL)
	    goto error_return;

	  for (t = incl_entry->totals; t != NULL; t = t->next)
	    if (t->total == val)
	      break;

	  /* Record this symbol, so that we can set the value
             correctly.  */
	  amt = sizeof *ne;
	  ne = (struct stab_excl_list *) bfd_alloc (abfd, amt);
	  if (ne == NULL)
	    goto error_return;
	  ne->offset = sym - stabbuf;
	  ne->val = val;
	  ne->type = N_BINCL;
	  ne->next = secinfo->excls;
	  secinfo->excls = ne;

	  if (t == NULL)
	    {
	      /* This is the first time we have seen this header file
		 with this set of stabs strings.  */
	      t = ((struct stab_link_includes_totals *)
		   bfd_hash_allocate (&sinfo->includes.root, sizeof *t));
	      if (t == NULL)
		goto error_return;
	      t->total = val;
	      t->next = incl_entry->totals;
	      incl_entry->totals = t;
	    }
	  else
	    {
	      bfd_size_type *incl_pstridx;

	      /* We have seen this header file before.  Tell the final
		 pass to change the type to N_EXCL.  */
	      ne->type = N_EXCL;

	      /* Mark the skipped symbols.  */

	      nest = 0;
	      for (incl_sym = sym + STABSIZE, incl_pstridx = pstridx + 1;
		   incl_sym < symend;
		   incl_sym += STABSIZE, ++incl_pstridx)
		{
		  int incl_type;

		  incl_type = incl_sym[TYPEOFF];

		  if (incl_type == N_EINCL)
		    {
		      if (nest == 0)
			{
			  *incl_pstridx = (bfd_size_type) -1;
			  ++skip;
			  break;
			}
		      --nest;
		    }
		  else if (incl_type == N_BINCL)
		    ++nest;
		  else if (nest == 0)
		    {
		      *incl_pstridx = (bfd_size_type) -1;
		      ++skip;
		    }
		}
	    }
	}
    }

  free (stabbuf);
  stabbuf = NULL;
  free (stabstrbuf);
  stabstrbuf = NULL;

  /* We need to set the section sizes such that the linker will
     compute the output section sizes correctly.  We set the .stab
     size to not include the entries we don't want.  We set
     SEC_EXCLUDE for the .stabstr section, so that it will be dropped
     from the link.  We record the size of the strtab in the first
     .stabstr section we saw, and make sure we don't set SEC_EXCLUDE
     for that section.  */
  stabsec->_cooked_size = (count - skip) * STABSIZE;
  if (stabsec->_cooked_size == 0)
    stabsec->flags |= SEC_EXCLUDE;
  stabstrsec->flags |= SEC_EXCLUDE;
  sinfo->stabstr->_cooked_size = _bfd_stringtab_size (sinfo->strings);

  /* Calculate the `cumulative_skips' array now that stabs have been
     deleted for this section.  */

  if (skip != 0)
    {
      bfd_size_type i, offset;
      bfd_size_type *pskips;

      amt = count * sizeof (bfd_size_type);
      secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt);
      if (secinfo->cumulative_skips == NULL)
	goto error_return;

      pskips = secinfo->cumulative_skips;
      pstridx = secinfo->stridxs;
      offset = 0;

      for (i = 0; i < count; i++, pskips++, pstridx++)
	{
	  *pskips = offset;
	  if (*pstridx == (bfd_size_type) -1)
	    offset += STABSIZE;
	}

      BFD_ASSERT (offset != 0);
    }

  return true;

 error_return:
  if (stabbuf != NULL)
    free (stabbuf);
  if (stabstrbuf != NULL)
    free (stabstrbuf);
  return false;
}


/* This function is called for each input file before the stab
   section is relocated.  It discards stab entries for discarded
   functions and variables.  The function returns true iff
   any entries have been deleted.
*/

boolean
_bfd_discard_section_stabs (abfd, stabsec, psecinfo,
			    reloc_symbol_deleted_p, cookie)
     bfd *abfd;
     asection *stabsec;
     PTR psecinfo;
     boolean (*reloc_symbol_deleted_p) PARAMS ((bfd_vma, PTR));
     PTR cookie;
{
  bfd_size_type count, amt;
  struct stab_section_info *secinfo;
  bfd_byte *stabbuf = NULL;
  bfd_byte *sym, *symend;
  bfd_size_type skip;
  bfd_size_type *pstridx;
  int deleting;

  if (stabsec->_raw_size == 0)
    {
      /* This file does not contain stabs debugging information.  */
      return false;
    }

  if (stabsec->_raw_size % STABSIZE != 0)
    {
      /* Something is wrong with the format of these stab symbols.
         Don't try to optimize them.  */
      return false;
    }

  if ((stabsec->output_section != NULL
       && bfd_is_abs_section (stabsec->output_section)))
    {
      /* At least one of the sections is being discarded from the
         link, so we should just ignore them.  */
      return false;
    }

  /* We should have initialized our data in _bfd_link_stab_sections.
     If there was some bizarre error reading the string sections, though,
     we might not have.  Bail rather than asserting.  */
  if (psecinfo == NULL)
    return false;

  count = stabsec->_raw_size / STABSIZE;
  secinfo = (struct stab_section_info *) psecinfo;

  /* Read the stabs information from abfd.  */

  stabbuf = (bfd_byte *) bfd_malloc (stabsec->_raw_size);
  if (stabbuf == NULL)
    goto error_return;

  if (! bfd_get_section_contents (abfd, stabsec, stabbuf, (bfd_vma) 0,
				  stabsec->_raw_size))
    goto error_return;

  /* Look through the stabs symbols and discard any information for
     discarded functions.  */

  skip = 0;
  deleting = -1;

  symend = stabbuf + stabsec->_raw_size;
  for (sym = stabbuf, pstridx = secinfo->stridxs;
       sym < symend;
       sym += STABSIZE, ++pstridx)
    {
      int type;

      if (*pstridx == (bfd_size_type) -1)
	{
	  /* This stab was deleted in a previous pass.  */
	  continue;
	}

      type = sym[TYPEOFF];

      if (type == N_FUN)
	{
	  int strx = bfd_get_32 (abfd, sym + STRDXOFF);

	  if (strx == 0)
	    {
	      if (deleting)
		{
		  skip++;
		  *pstridx = -1;
		}
	      deleting = -1;
	      continue;
	    }
	  deleting = 0;
	  if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie))
	    deleting = 1;
	}

      if (deleting == 1)
	{
	  *pstridx = -1;
	  skip++;
	}
      else if (deleting == -1)
	{
	  /* Outside of a function.  Check for deleted variables.  */
	  if (type == N_STSYM || type == N_LCSYM)
	    if ((*reloc_symbol_deleted_p) (sym + VALOFF - stabbuf, cookie))
	      {
		*pstridx = -1;
		skip ++;
	      }
	  /* We should also check for N_GSYM entries which reference a
	     deleted global, but those are less harmful to debuggers
	     and would require parsing the stab strings.  */
	}
    }

  free (stabbuf);
  stabbuf = NULL;

  /* Shrink the stabsec as needed.  */
  stabsec->_cooked_size -= skip * STABSIZE;
  if (stabsec->_cooked_size == 0)
    stabsec->flags |= SEC_EXCLUDE;

  /* Recalculate the `cumulative_skips' array now that stabs have been
     deleted for this section.  */

  if (skip != 0)
    {
      bfd_size_type i, offset;
      bfd_size_type *pskips;

      if (secinfo->cumulative_skips == NULL)
	{
	  amt = count * sizeof (bfd_size_type);
	  secinfo->cumulative_skips = (bfd_size_type *) bfd_alloc (abfd, amt);
	  if (secinfo->cumulative_skips == NULL)
	    goto error_return;
	}

      pskips = secinfo->cumulative_skips;
      pstridx = secinfo->stridxs;
      offset = 0;

      for (i = 0; i < count; i++, pskips++, pstridx++)
	{
	  *pskips = offset;
	  if (*pstridx == (bfd_size_type) -1)
	    offset += STABSIZE;
	}

      BFD_ASSERT (offset != 0);
    }

  return (skip > 0);

 error_return:
  if (stabbuf != NULL)
    free (stabbuf);
  return false;
}

/* Write out the stab section.  This is called with the relocated
   contents.  */

boolean
_bfd_write_section_stabs (output_bfd, psinfo, stabsec, psecinfo, contents)
     bfd *output_bfd;
     PTR *psinfo;
     asection *stabsec;
     PTR *psecinfo;
     bfd_byte *contents;
{
  struct stab_info *sinfo;
  struct stab_section_info *secinfo;
  struct stab_excl_list *e;
  bfd_byte *sym, *tosym, *symend;
  bfd_size_type *pstridx;

  sinfo = (struct stab_info *) *psinfo;
  secinfo = (struct stab_section_info *) *psecinfo;

  if (secinfo == NULL)
    return bfd_set_section_contents (output_bfd, stabsec->output_section,
				     contents,
				     (file_ptr) stabsec->output_offset,
				     stabsec->_raw_size);

  /* Handle each N_BINCL entry.  */
  for (e = secinfo->excls; e != NULL; e = e->next)
    {
      bfd_byte *excl_sym;

      BFD_ASSERT (e->offset < stabsec->_raw_size);
      excl_sym = contents + e->offset;
      bfd_put_32 (output_bfd, e->val, excl_sym + VALOFF);
      excl_sym[TYPEOFF] = e->type;
    }

  /* Copy over all the stabs symbols, omitting the ones we don't want,
     and correcting the string indices for those we do want.  */
  tosym = contents;
  symend = contents + stabsec->_raw_size;
  for (sym = contents, pstridx = secinfo->stridxs;
       sym < symend;
       sym += STABSIZE, ++pstridx)
    {
      if (*pstridx != (bfd_size_type) -1)
	{
	  if (tosym != sym)
	    memcpy (tosym, sym, STABSIZE);
	  bfd_put_32 (output_bfd, *pstridx, tosym + STRDXOFF);

	  if (sym[TYPEOFF] == 0)
	    {
	      /* This is the header symbol for the stabs section.  We
                 don't really need one, since we have merged all the
                 input stabs sections into one, but we generate one
                 for the benefit of readers which expect to see one.  */
	      BFD_ASSERT (sym == contents);
	      bfd_put_32 (output_bfd, _bfd_stringtab_size (sinfo->strings),
			  tosym + VALOFF);
	      bfd_put_16 (output_bfd,
			  stabsec->output_section->_raw_size / STABSIZE - 1,
			  tosym + DESCOFF);
	    }

	  tosym += STABSIZE;
	}
    }

  BFD_ASSERT ((bfd_size_type) (tosym - contents) == stabsec->_cooked_size);

  return bfd_set_section_contents (output_bfd, stabsec->output_section,
				   contents, (file_ptr) stabsec->output_offset,
				   stabsec->_cooked_size);
}

/* Write out the .stabstr section.  */

boolean
_bfd_write_stab_strings (output_bfd, psinfo)
     bfd *output_bfd;
     PTR *psinfo;
{
  struct stab_info *sinfo;

  sinfo = (struct stab_info *) *psinfo;

  if (sinfo == NULL)
    return true;

  if (bfd_is_abs_section (sinfo->stabstr->output_section))
    {
      /* The section was discarded from the link.  */
      return true;
    }

  BFD_ASSERT ((sinfo->stabstr->output_offset
	       + _bfd_stringtab_size (sinfo->strings))
	      <= sinfo->stabstr->output_section->_raw_size);

  if (bfd_seek (output_bfd,
		(file_ptr) (sinfo->stabstr->output_section->filepos
			    + sinfo->stabstr->output_offset),
		SEEK_SET) != 0)
    return false;

  if (! _bfd_stringtab_emit (output_bfd, sinfo->strings))
    return false;

  /* We no longer need the stabs information.  */
  _bfd_stringtab_free (sinfo->strings);
  bfd_hash_table_free (&sinfo->includes.root);

  return true;
}

/* Adjust an address in the .stab section.  Given OFFSET within
   STABSEC, this returns the new offset in the adjusted stab section,
   or -1 if the address refers to a stab which has been removed.  */

bfd_vma
_bfd_stab_section_offset (output_bfd, psinfo, stabsec, psecinfo, offset)
     bfd *output_bfd ATTRIBUTE_UNUSED;
     PTR *psinfo ATTRIBUTE_UNUSED;
     asection *stabsec;
     PTR *psecinfo;
     bfd_vma offset;
{
  struct stab_section_info *secinfo;

  secinfo = (struct stab_section_info *) *psecinfo;

  if (secinfo == NULL)
    return offset;

  if (offset >= stabsec->_raw_size)
    return offset - (stabsec->_cooked_size - stabsec->_raw_size);

  if (secinfo->cumulative_skips)
    {
      bfd_vma i;

      i = offset / STABSIZE;

      if (secinfo->stridxs [i] == (bfd_size_type) -1)
	return (bfd_vma) -1;

      return offset - secinfo->cumulative_skips [i];
    }

  return offset;
}