aboutsummaryrefslogtreecommitdiff
path: root/gdb/osfsolib.c
blob: 8638629139dd48027ad1539371704cafbc2390db (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
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
/* Handle OSF/1 shared libraries for GDB, the GNU Debugger.
   Copyright 1993, 94, 95, 96, 98, 1999 Free Software Foundation, Inc.

   This file is part of GDB.

   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.  */

/* FIXME: Most of this code could be merged with solib.c by using
   next_link_map_member and xfer_link_map_member in solib.c.  */

#include "defs.h"

#include <sys/types.h>
#include <signal.h>
#include "gdb_string.h"
#include <fcntl.h>

#include "symtab.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdbcore.h"
#include "command.h"
#include "target.h"
#include "frame.h"
#include "gdb_regex.h"
#include "inferior.h"
#include "language.h"
#include "gdbcmd.h"

#define MAX_PATH_SIZE 1024	/* FIXME: Should be dynamic */

/* When handling shared libraries, GDB has to find out the pathnames
   of all shared libraries that are currently loaded (to read in their
   symbols) and where the shared libraries are loaded in memory
   (to relocate them properly from their prelinked addresses to the
   current load address).

   Under OSF/1 there are two possibilities to get at this information:
   1) Peek around in the runtime loader structures.
   These are not documented, and they are not defined in the system
   header files. The definitions below were obtained by experimentation,
   but they seem stable enough.
   2) Use the undocumented libxproc.a library, which contains the
   equivalent ldr_* routines.
   This approach is somewhat cleaner, but it requires that the GDB
   executable is dynamically linked. In addition it requires a
   NAT_CLIBS= -lxproc -Wl,-expect_unresolved,ldr_process_context
   linker specification for GDB and all applications that are using
   libgdb.
   We will use the peeking approach until it becomes unwieldy.  */

#ifndef USE_LDR_ROUTINES

/* Definition of runtime loader structures, found by experimentation.  */
#define RLD_CONTEXT_ADDRESS	0x3ffc0000000

typedef struct
  {
    CORE_ADDR next;
    CORE_ADDR previous;
    CORE_ADDR unknown1;
    char *module_name;
    CORE_ADDR modinfo_addr;
    long module_id;
    CORE_ADDR unknown2;
    CORE_ADDR unknown3;
    long region_count;
    CORE_ADDR regioninfo_addr;
  }
ldr_module_info_t;

typedef struct
  {
    long unknown1;
    CORE_ADDR regionname_addr;
    long protection;
    CORE_ADDR vaddr;
    CORE_ADDR mapaddr;
    long size;
    long unknown2[5];
  }
ldr_region_info_t;

typedef struct
  {
    CORE_ADDR unknown1;
    CORE_ADDR unknown2;
    CORE_ADDR head;
    CORE_ADDR tail;
  }
ldr_context_t;

static ldr_context_t ldr_context;

#else

#include <loader.h>
static ldr_process_t fake_ldr_process;

/* Called by ldr_* routines to read memory from the current target.  */

static int ldr_read_memory PARAMS ((CORE_ADDR, char *, int, int));

static int
ldr_read_memory (memaddr, myaddr, len, readstring)
     CORE_ADDR memaddr;
     char *myaddr;
     int len;
     int readstring;
{
  int result;
  char *buffer;

  if (readstring)
    {
      target_read_string (memaddr, &buffer, len, &result);
      if (result == 0)
	strcpy (myaddr, buffer);
      free (buffer);
    }
  else
    result = target_read_memory (memaddr, myaddr, len);

  if (result != 0)
    result = -result;
  return result;
}

#endif

/* Define our own link_map structure.
   This will help to share code with solib.c.  */

struct link_map
{
  CORE_ADDR l_offset;		/* prelink to load address offset */
  char *l_name;			/* full name of loaded object */
  ldr_module_info_t module_info;	/* corresponding module info */
};

#define LM_OFFSET(so) ((so) -> lm.l_offset)
#define LM_NAME(so) ((so) -> lm.l_name)

struct so_list
  {
    struct so_list *next;	/* next structure in linked list */
    struct link_map lm;		/* copy of link map from inferior */
    struct link_map *lmaddr;	/* addr in inferior lm was read from */
    CORE_ADDR lmend;		/* upper addr bound of mapped object */
    char so_name[MAX_PATH_SIZE];	/* shared object lib name (FIXME) */
    char symbols_loaded;	/* flag: symbols read in yet? */
    char from_tty;		/* flag: print msgs? */
    struct objfile *objfile;	/* objfile for loaded lib */
    struct section_table *sections;
    struct section_table *sections_end;
    struct section_table *textsection;
    bfd *abfd;
  };

static struct so_list *so_list_head;	/* List of known shared objects */

extern int
fdmatch PARAMS ((int, int));	/* In libiberty */

/* Local function prototypes */

static void
sharedlibrary_command PARAMS ((char *, int));

static void
info_sharedlibrary_command PARAMS ((char *, int));

static int
symbol_add_stub PARAMS ((char *));

static struct so_list *
  find_solib PARAMS ((struct so_list *));

static struct link_map *
  first_link_map_member PARAMS ((void));

static struct link_map *
  next_link_map_member PARAMS ((struct so_list *));

static void
xfer_link_map_member PARAMS ((struct so_list *, struct link_map *));

static int
solib_map_sections PARAMS ((char *));

/*

   LOCAL FUNCTION

   solib_map_sections -- open bfd and build sections for shared lib

   SYNOPSIS

   static int solib_map_sections (struct so_list *so)

   DESCRIPTION

   Given a pointer to one of the shared objects in our list
   of mapped objects, use the recorded name to open a bfd
   descriptor for the object, build a section table, and then
   relocate all the section addresses by the base address at
   which the shared object was mapped.

   FIXMES

   In most (all?) cases the shared object file name recorded in the
   dynamic linkage tables will be a fully qualified pathname.  For
   cases where it isn't, do we really mimic the systems search
   mechanism correctly in the below code (particularly the tilde
   expansion stuff?).
 */

static int
solib_map_sections (arg)
     char *arg;
{
  struct so_list *so = (struct so_list *) arg;	/* catch_errors bogon */
  char *filename;
  char *scratch_pathname;
  int scratch_chan;
  struct section_table *p;
  struct cleanup *old_chain;
  bfd *abfd;

  filename = tilde_expand (so->so_name);
  old_chain = make_cleanup (free, filename);

  scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
			&scratch_pathname);
  if (scratch_chan < 0)
    {
      scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,
			    O_RDONLY, 0, &scratch_pathname);
    }
  if (scratch_chan < 0)
    {
      perror_with_name (filename);
    }
  /* Leave scratch_pathname allocated.  bfd->name will point to it.  */

  abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
  if (!abfd)
    {
      close (scratch_chan);
      error ("Could not open `%s' as an executable file: %s",
	     scratch_pathname, bfd_errmsg (bfd_get_error ()));
    }
  /* Leave bfd open, core_xfer_memory and "info files" need it.  */
  so->abfd = abfd;
  abfd->cacheable = true;

  if (!bfd_check_format (abfd, bfd_object))
    {
      error ("\"%s\": not in executable format: %s.",
	     scratch_pathname, bfd_errmsg (bfd_get_error ()));
    }
  if (build_section_table (abfd, &so->sections, &so->sections_end))
    {
      error ("Can't find the file sections in `%s': %s",
	     bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ()));
    }

  for (p = so->sections; p < so->sections_end; p++)
    {
      /* Relocate the section binding addresses as recorded in the shared
         object's file by the offset to get the address to which the
         object was actually mapped.  */
      p->addr += LM_OFFSET (so);
      p->endaddr += LM_OFFSET (so);
      so->lmend = (CORE_ADDR) max (p->endaddr, so->lmend);
      if (STREQ (p->the_bfd_section->name, ".text"))
	{
	  so->textsection = p;
	}
    }

  /* Free the file names, close the file now.  */
  do_cleanups (old_chain);

  return (1);
}

/*

   LOCAL FUNCTION

   first_link_map_member -- locate first member in dynamic linker's map

   SYNOPSIS

   static struct link_map *first_link_map_member (void)

   DESCRIPTION

   Read in a copy of the first member in the inferior's dynamic
   link map from the inferior's dynamic linker structures, and return
   a pointer to the copy in our address space.
 */

static struct link_map *
first_link_map_member ()
{
  struct link_map *lm = NULL;
  static struct link_map first_lm;

#ifdef USE_LDR_ROUTINES
  ldr_module_t mod_id = LDR_NULL_MODULE;
  size_t retsize;

  fake_ldr_process = ldr_core_process ();
  ldr_set_core_reader (ldr_read_memory);
  ldr_xdetach (fake_ldr_process);
  if (ldr_xattach (fake_ldr_process) != 0
      || ldr_next_module (fake_ldr_process, &mod_id) != 0
      || mod_id == LDR_NULL_MODULE
      || ldr_inq_module (fake_ldr_process, mod_id,
			 &first_lm.module_info, sizeof (ldr_module_info_t),
			 &retsize) != 0)
    return lm;
#else
  CORE_ADDR ldr_context_addr;

  if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
			  (char *) &ldr_context_addr,
			  sizeof (CORE_ADDR)) != 0
      || target_read_memory (ldr_context_addr,
			     (char *) &ldr_context,
			     sizeof (ldr_context_t)) != 0
      || target_read_memory ((CORE_ADDR) ldr_context.head,
			     (char *) &first_lm.module_info,
			     sizeof (ldr_module_info_t)) != 0)
    return lm;
#endif

  lm = &first_lm;

  /* The first entry is for the main program and should be skipped.  */
  lm->l_name = NULL;

  return lm;
}

static struct link_map *
next_link_map_member (so_list_ptr)
     struct so_list *so_list_ptr;
{
  struct link_map *lm = NULL;
  static struct link_map next_lm;
#ifdef USE_LDR_ROUTINES
  ldr_module_t mod_id = so_list_ptr->lm.module_info.lmi_modid;
  size_t retsize;

  if (ldr_next_module (fake_ldr_process, &mod_id) != 0
      || mod_id == LDR_NULL_MODULE
      || ldr_inq_module (fake_ldr_process, mod_id,
			 &next_lm.module_info, sizeof (ldr_module_info_t),
			 &retsize) != 0)
    return lm;

  lm = &next_lm;
  lm->l_name = lm->module_info.lmi_name;
#else
  CORE_ADDR ldr_context_addr;

  /* Reread context in case ldr_context.tail was updated.  */

  if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
			  (char *) &ldr_context_addr,
			  sizeof (CORE_ADDR)) != 0
      || target_read_memory (ldr_context_addr,
			     (char *) &ldr_context,
			     sizeof (ldr_context_t)) != 0
      || so_list_ptr->lm.module_info.modinfo_addr == ldr_context.tail
      || target_read_memory (so_list_ptr->lm.module_info.next,
			     (char *) &next_lm.module_info,
			     sizeof (ldr_module_info_t)) != 0)
    return lm;

  lm = &next_lm;
  lm->l_name = lm->module_info.module_name;
#endif
  return lm;
}

static void
xfer_link_map_member (so_list_ptr, lm)
     struct so_list *so_list_ptr;
     struct link_map *lm;
{
  int i;
  so_list_ptr->lm = *lm;

  /* OSF/1 shared libraries are pre-linked to particular addresses,
     but the runtime loader may have to relocate them if the
     address ranges of the libraries used by the target executable clash,
     or if the target executable is linked with the -taso option.
     The offset is the difference between the address where the shared
     library is mapped and the pre-linked address of the shared library.

     FIXME:  GDB is currently unable to relocate the shared library
     sections by different offsets. If sections are relocated by
     different offsets, put out a warning and use the offset of the
     first section for all remaining sections.  */
  LM_OFFSET (so_list_ptr) = 0;

  /* There is one entry that has no name (for the inferior executable)
     since it is not a shared object. */
  if (LM_NAME (so_list_ptr) != 0)
    {

#ifdef USE_LDR_ROUTINES
      int len = strlen (LM_NAME (so_list_ptr) + 1);

      if (len > MAX_PATH_SIZE)
	len = MAX_PATH_SIZE;
      strncpy (so_list_ptr->so_name, LM_NAME (so_list_ptr), MAX_PATH_SIZE);
      so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';

      for (i = 0; i < lm->module_info.lmi_nregion; i++)
	{
	  ldr_region_info_t region_info;
	  size_t retsize;
	  CORE_ADDR region_offset;

	  if (ldr_inq_region (fake_ldr_process, lm->module_info.lmi_modid,
			      i, &region_info, sizeof (region_info),
			      &retsize) != 0)
	    break;
	  region_offset = (CORE_ADDR) region_info.lri_mapaddr
	    - (CORE_ADDR) region_info.lri_vaddr;
	  if (i == 0)
	    LM_OFFSET (so_list_ptr) = region_offset;
	  else if (LM_OFFSET (so_list_ptr) != region_offset)
	    warning ("cannot handle shared library relocation for %s (%s)",
		     so_list_ptr->so_name, region_info.lri_name);
	}
#else
      int errcode;
      char *buffer;
      target_read_string ((CORE_ADDR) LM_NAME (so_list_ptr), &buffer,
			  MAX_PATH_SIZE - 1, &errcode);
      if (errcode != 0)
	error ("xfer_link_map_member: Can't read pathname for load map: %s\n",
	       safe_strerror (errcode));
      strncpy (so_list_ptr->so_name, buffer, MAX_PATH_SIZE - 1);
      free (buffer);
      so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';

      for (i = 0; i < lm->module_info.region_count; i++)
	{
	  ldr_region_info_t region_info;
	  CORE_ADDR region_offset;

	  if (target_read_memory (lm->module_info.regioninfo_addr
				  + i * sizeof (region_info),
				  (char *) &region_info,
				  sizeof (region_info)) != 0)
	    break;
	  region_offset = region_info.mapaddr - region_info.vaddr;
	  if (i == 0)
	    LM_OFFSET (so_list_ptr) = region_offset;
	  else if (LM_OFFSET (so_list_ptr) != region_offset)
	    {
	      char *region_name;
	      target_read_string (region_info.regionname_addr, &buffer,
				  MAX_PATH_SIZE - 1, &errcode);
	      if (errcode == 0)
		region_name = buffer;
	      else
		region_name = "??";
	      warning ("cannot handle shared library relocation for %s (%s)",
		       so_list_ptr->so_name, region_name);
	      free (buffer);
	    }
	}
#endif

      catch_errors (solib_map_sections, (char *) so_list_ptr,
		    "Error while mapping shared library sections:\n",
		    RETURN_MASK_ALL);
    }
}

/*

   LOCAL FUNCTION

   find_solib -- step through list of shared objects

   SYNOPSIS

   struct so_list *find_solib (struct so_list *so_list_ptr)

   DESCRIPTION

   This module contains the routine which finds the names of any
   loaded "images" in the current process. The argument in must be
   NULL on the first call, and then the returned value must be passed
   in on subsequent calls. This provides the capability to "step" down
   the list of loaded objects. On the last object, a NULL value is
   returned.

   The arg and return value are "struct link_map" pointers, as defined
   in <link.h>.
 */

static struct so_list *
find_solib (so_list_ptr)
     struct so_list *so_list_ptr;	/* Last lm or NULL for first one */
{
  struct so_list *so_list_next = NULL;
  struct link_map *lm = NULL;
  struct so_list *new;

  if (so_list_ptr == NULL)
    {
      /* We are setting up for a new scan through the loaded images. */
      if ((so_list_next = so_list_head) == NULL)
	{
	  /* Find the first link map list member. */
	  lm = first_link_map_member ();
	}
    }
  else
    {
      /* We have been called before, and are in the process of walking
         the shared library list.  Advance to the next shared object. */
      lm = next_link_map_member (so_list_ptr);
      so_list_next = so_list_ptr->next;
    }
  if ((so_list_next == NULL) && (lm != NULL))
    {
      /* Get next link map structure from inferior image and build a local
         abbreviated load_map structure */
      new = (struct so_list *) xmalloc (sizeof (struct so_list));
      memset ((char *) new, 0, sizeof (struct so_list));
      new->lmaddr = lm;
      /* Add the new node as the next node in the list, or as the root
         node if this is the first one. */
      if (so_list_ptr != NULL)
	{
	  so_list_ptr->next = new;
	}
      else
	{
	  so_list_head = new;
	}
      so_list_next = new;
      xfer_link_map_member (new, lm);
    }
  return (so_list_next);
}

/* A small stub to get us past the arg-passing pinhole of catch_errors.  */

static int
symbol_add_stub (arg)
     char *arg;
{
  register struct so_list *so = (struct so_list *) arg;		/* catch_errs bogon */
  CORE_ADDR text_addr = 0;
  struct section_addr_info section_addrs;

  memset (&section_addrs, 0, sizeof (section_addrs));
  if (so->textsection)
    text_addr = so->textsection->addr;
  else if (so->abfd != NULL)
    {
      asection *lowest_sect;

      /* If we didn't find a mapped non zero sized .text section, set up
         text_addr so that the relocation in symbol_file_add does no harm.  */

      lowest_sect = bfd_get_section_by_name (so->abfd, ".text");
      if (lowest_sect == NULL)
	bfd_map_over_sections (so->abfd, find_lowest_section,
			       (PTR) &lowest_sect);
      if (lowest_sect)
	text_addr = bfd_section_vma (so->abfd, lowest_sect) + LM_OFFSET (so);
    }

  section_addrs.other[0].addr = text_addr;
  section_addrs.other[0].name = ".text";
  so->objfile = symbol_file_add (so->so_name, so->from_tty,
				 &section_addrs, 0, OBJF_SHARED);
  return (1);
}

/*

   GLOBAL FUNCTION

   solib_add -- add a shared library file to the symtab and section list

   SYNOPSIS

   void solib_add (char *arg_string, int from_tty,
   struct target_ops *target)

   DESCRIPTION

 */

void
solib_add (arg_string, from_tty, target)
     char *arg_string;
     int from_tty;
     struct target_ops *target;
{
  register struct so_list *so = NULL;	/* link map state variable */

  /* Last shared library that we read.  */
  struct so_list *so_last = NULL;

  char *re_err;
  int count;
  int old;

  if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
    {
      error ("Invalid regexp: %s", re_err);
    }


  /* Add the shared library sections to the section table of the
     specified target, if any.  */
  if (target)
    {
      /* Count how many new section_table entries there are.  */
      so = NULL;
      count = 0;
      while ((so = find_solib (so)) != NULL)
	{
	  if (so->so_name[0])
	    {
	      count += so->sections_end - so->sections;
	    }
	}

      if (count)
	{
	  /* Add these section table entries to the target's table.  */

	  old = target_resize_to_sections (target, count);
	  
	  while ((so = find_solib (so)) != NULL)
	    {
	      if (so->so_name[0])
		{
		  count = so->sections_end - so->sections;
		  memcpy ((char *) (target->to_sections + old),
			  so->sections,
			  (sizeof (struct section_table)) * count);
		  old += count;
		}
	    }
	}
    }

  /* Now add the symbol files.  */
  so = NULL;
  while ((so = find_solib (so)) != NULL)
    {
      if (so->so_name[0] && re_exec (so->so_name))
	{
	  so->from_tty = from_tty;
	  if (so->symbols_loaded)
	    {
	      if (from_tty)
		{
		  printf_unfiltered ("Symbols already loaded for %s\n", so->so_name);
		}
	    }
	  else if (catch_errors
		   (symbol_add_stub, (char *) so,
		    "Error while reading shared library symbols:\n",
		    RETURN_MASK_ALL))
	    {
	      so_last = so;
	      so->symbols_loaded = 1;
	    }
	}
    }

  /* Getting new symbols may change our opinion about what is
     frameless.  */
  if (so_last)
    reinit_frame_cache ();
}

/*

   LOCAL FUNCTION

   info_sharedlibrary_command -- code for "info sharedlibrary"

   SYNOPSIS

   static void info_sharedlibrary_command ()

   DESCRIPTION

   Walk through the shared library list and print information
   about each attached library.
 */

static void
info_sharedlibrary_command (ignore, from_tty)
     char *ignore;
     int from_tty;
{
  register struct so_list *so = NULL;	/* link map state variable */
  int header_done = 0;

  if (exec_bfd == NULL)
    {
      printf_unfiltered ("No executable file.\n");
      return;
    }
  while ((so = find_solib (so)) != NULL)
    {
      if (so->so_name[0])
	{
	  unsigned long txt_start = 0;
	  unsigned long txt_end = 0;

	  if (!header_done)
	    {
	      printf_unfiltered ("%-20s%-20s%-12s%s\n", "From", "To", "Syms Read",
				 "Shared Object Library");
	      header_done++;
	    }
	  if (so->textsection)
	    {
	      txt_start = (unsigned long) so->textsection->addr;
	      txt_end = (unsigned long) so->textsection->endaddr;
	    }
	  printf_unfiltered ("%-20s", local_hex_string_custom (txt_start, "08l"));
	  printf_unfiltered ("%-20s", local_hex_string_custom (txt_end, "08l"));
	  printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No");
	  printf_unfiltered ("%s\n", so->so_name);
	}
    }
  if (so_list_head == NULL)
    {
      printf_unfiltered ("No shared libraries loaded at this time.\n");
    }
}

/*

   GLOBAL FUNCTION

   solib_address -- check to see if an address is in a shared lib

   SYNOPSIS

   char *solib_address (CORE_ADDR address)

   DESCRIPTION

   Provides a hook for other gdb routines to discover whether or
   not a particular address is within the mapped address space of
   a shared library.  Any address between the base mapping address
   and the first address beyond the end of the last mapping, is
   considered to be within the shared library address space, for
   our purposes.

   For example, this routine is called at one point to disable
   breakpoints which are in shared libraries that are not currently
   mapped in.
 */

char *
solib_address (address)
     CORE_ADDR address;
{
  register struct so_list *so = 0;	/* link map state variable */

  while ((so = find_solib (so)) != NULL)
    {
      if (so->so_name[0] && so->textsection)
	{
	  if ((address >= (CORE_ADDR) so->textsection->addr) &&
	      (address < (CORE_ADDR) so->textsection->endaddr))
	    return (so->so_name);
	}
    }
  return (0);
}

/* Called by free_all_symtabs */

void
clear_solib ()
{
  struct so_list *next;
  char *bfd_filename;

  disable_breakpoints_in_shlibs (1);

  while (so_list_head)
    {
      if (so_list_head->sections)
	{
	  free ((PTR) so_list_head->sections);
	}
      if (so_list_head->abfd)
	{
	  bfd_filename = bfd_get_filename (so_list_head->abfd);
	  if (!bfd_close (so_list_head->abfd))
	    warning ("cannot close \"%s\": %s",
		     bfd_filename, bfd_errmsg (bfd_get_error ()));
	}
      else
	/* This happens for the executable on SVR4.  */
	bfd_filename = NULL;

      next = so_list_head->next;
      if (bfd_filename)
	free ((PTR) bfd_filename);
      free ((PTR) so_list_head);
      so_list_head = next;
    }
}

/*

   GLOBAL FUNCTION

   solib_create_inferior_hook -- shared library startup support

   SYNOPSIS

   void solib_create_inferior_hook()

   DESCRIPTION

   When gdb starts up the inferior, it nurses it along (through the
   shell) until it is ready to execute it's first instruction.  At this
   point, this function gets called via expansion of the macro
   SOLIB_CREATE_INFERIOR_HOOK.
   For a statically bound executable, this first instruction is the
   one at "_start", or a similar text label. No further processing is
   needed in that case.
   For a dynamically bound executable, this first instruction is somewhere
   in the rld, and the actual user executable is not yet mapped in.
   We continue the inferior again, rld then maps in the actual user
   executable and any needed shared libraries and then sends
   itself a SIGTRAP.
   At that point we discover the names of all shared libraries and
   read their symbols in.

   FIXME

   This code does not properly handle hitting breakpoints which the
   user might have set in the rld itself.  Proper handling would have
   to check if the SIGTRAP happened due to a kill call.

   Also, what if child has exit()ed?  Must exit loop somehow.
 */

void
solib_create_inferior_hook ()
{

  /* Nothing to do for statically bound executables.  */

  if (symfile_objfile == NULL
      || symfile_objfile->obfd == NULL
      || ((bfd_get_file_flags (symfile_objfile->obfd) & DYNAMIC) == 0))
    return;

  /* Now run the target.  It will eventually get a SIGTRAP, at
     which point all of the libraries will have been mapped in and we
     can go groveling around in the rld structures to find
     out what we need to know about them. */

  clear_proceed_status ();
  stop_soon_quietly = 1;
  stop_signal = TARGET_SIGNAL_0;
  do
    {
      target_resume (-1, 0, stop_signal);
      wait_for_inferior ();
    }
  while (stop_signal != TARGET_SIGNAL_TRAP);

  /*  solib_add will call reinit_frame_cache.
     But we are stopped in the runtime loader and we do not have symbols
     for the runtime loader. So heuristic_proc_start will be called
     and will put out an annoying warning.
     Delaying the resetting of stop_soon_quietly until after symbol loading
     suppresses the warning.  */
  if (auto_solib_add)
    solib_add ((char *) 0, 0, (struct target_ops *) 0);
  stop_soon_quietly = 0;
}


/*

   LOCAL FUNCTION

   sharedlibrary_command -- handle command to explicitly add library

   SYNOPSIS

   static void sharedlibrary_command (char *args, int from_tty)

   DESCRIPTION

 */

static void
sharedlibrary_command (args, from_tty)
     char *args;
     int from_tty;
{
  dont_repeat ();
  solib_add (args, from_tty, (struct target_ops *) 0);
}

void
_initialize_solib ()
{
  add_com ("sharedlibrary", class_files, sharedlibrary_command,
	   "Load shared object library symbols for files matching REGEXP.");
  add_info ("sharedlibrary", info_sharedlibrary_command,
	    "Status of loaded shared object libraries.");

  add_show_from_set
    (add_set_cmd ("auto-solib-add", class_support, var_zinteger,
		  (char *) &auto_solib_add,
		  "Set autoloading of shared library symbols.\n\
If nonzero, symbols from all shared object libraries will be loaded\n\
automatically when the inferior begins execution or when the dynamic linker\n\
informs gdb that a new library has been loaded.  Otherwise, symbols\n\
must be loaded manually, using `sharedlibrary'.",
		  &setlist),
     &showlist);
}