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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [gcore.c] - Blame information for rev 474

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1 227 jeremybenn
/* Generate a core file for the inferior process.
2
 
3
   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4
   Free Software Foundation, Inc.
5
 
6
   This file is part of GDB.
7
 
8
   This program is free software; you can redistribute it and/or modify
9
   it under the terms of the GNU General Public License as published by
10
   the Free Software Foundation; either version 3 of the License, or
11
   (at your option) any later version.
12
 
13
   This program is distributed in the hope that it will be useful,
14
   but WITHOUT ANY WARRANTY; without even the implied warranty of
15
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
   GNU General Public License for more details.
17
 
18
   You should have received a copy of the GNU General Public License
19
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
20
 
21
#include "defs.h"
22
#include "elf-bfd.h"
23
#include "infcall.h"
24
#include "inferior.h"
25
#include "gdbcore.h"
26
#include "objfiles.h"
27
#include "solib.h"
28
#include "symfile.h"
29
#include "arch-utils.h"
30
#include "completer.h"
31
#include "gcore.h"
32
#include "cli/cli-decode.h"
33
#include "gdb_assert.h"
34
#include <fcntl.h>
35
#include "regcache.h"
36
#include "regset.h"
37
 
38
/* The largest amount of memory to read from the target at once.  We
39
   must throttle it to limit the amount of memory used by GDB during
40
   generate-core-file for programs with large resident data.  */
41
#define MAX_COPY_BYTES (1024 * 1024)
42
 
43
static const char *default_gcore_target (void);
44
static enum bfd_architecture default_gcore_arch (void);
45
static unsigned long default_gcore_mach (void);
46
static int gcore_memory_sections (bfd *);
47
 
48
/* create_gcore_bfd -- helper for gcore_command (exported).
49
   Open a new bfd core file for output, and return the handle.  */
50
 
51
bfd *
52
create_gcore_bfd (char *filename)
53
{
54
  bfd *obfd = bfd_openw (filename, default_gcore_target ());
55
  if (!obfd)
56
    error (_("Failed to open '%s' for output."), filename);
57
  bfd_set_format (obfd, bfd_core);
58
  bfd_set_arch_mach (obfd, default_gcore_arch (), default_gcore_mach ());
59
  return obfd;
60
}
61
 
62
/* write_gcore_file -- helper for gcore_command (exported).
63
   Compose and write the corefile data to the core file.  */
64
 
65
 
66
void
67
write_gcore_file (bfd *obfd)
68
{
69
  void *note_data = NULL;
70
  int note_size = 0;
71
  asection *note_sec = NULL;
72
 
73
  /* An external target method must build the notes section.  */
74
  note_data = target_make_corefile_notes (obfd, &note_size);
75
 
76
  /* Create the note section.  */
77
  if (note_data != NULL && note_size != 0)
78
    {
79
      note_sec = bfd_make_section_anyway_with_flags (obfd, "note0",
80
                                                     SEC_HAS_CONTENTS
81
                                                     | SEC_READONLY
82
                                                     | SEC_ALLOC);
83
      if (note_sec == NULL)
84
        error (_("Failed to create 'note' section for corefile: %s"),
85
               bfd_errmsg (bfd_get_error ()));
86
 
87
      bfd_set_section_vma (obfd, note_sec, 0);
88
      bfd_set_section_alignment (obfd, note_sec, 0);
89
      bfd_set_section_size (obfd, note_sec, note_size);
90
    }
91
 
92
  /* Now create the memory/load sections.  */
93
  if (gcore_memory_sections (obfd) == 0)
94
    error (_("gcore: failed to get corefile memory sections from target."));
95
 
96
  /* Write out the contents of the note section.  */
97
  if (note_data != NULL && note_size != 0)
98
    {
99
      if (!bfd_set_section_contents (obfd, note_sec, note_data, 0, note_size))
100
        warning (_("writing note section (%s)"),
101
                 bfd_errmsg (bfd_get_error ()));
102
    }
103
}
104
 
105
static void
106
do_bfd_delete_cleanup (void *arg)
107
{
108
  bfd *obfd = arg;
109
  const char *filename = obfd->filename;
110
 
111
  bfd_close (arg);
112
  unlink (filename);
113
}
114
 
115
/* gcore_command -- implements the 'gcore' command.
116
   Generate a core file from the inferior process.  */
117
 
118
static void
119
gcore_command (char *args, int from_tty)
120
{
121
  struct cleanup *old_chain;
122
  char *corefilename, corefilename_buffer[40];
123
  bfd *obfd;
124
 
125
  /* No use generating a corefile without a target process.  */
126
  if (!target_has_execution)
127
    noprocess ();
128
 
129
  if (args && *args)
130
    corefilename = args;
131
  else
132
    {
133
      /* Default corefile name is "core.PID".  */
134
      sprintf (corefilename_buffer, "core.%d", PIDGET (inferior_ptid));
135
      corefilename = corefilename_buffer;
136
    }
137
 
138
  if (info_verbose)
139
    fprintf_filtered (gdb_stdout,
140
                      "Opening corefile '%s' for output.\n", corefilename);
141
 
142
  /* Open the output file.  */
143
  obfd = create_gcore_bfd (corefilename);
144
 
145
  /* Need a cleanup that will close and delete the file.  */
146
  old_chain = make_cleanup (do_bfd_delete_cleanup, obfd);
147
 
148
  /* Call worker function.  */
149
  write_gcore_file (obfd);
150
 
151
  /* Succeeded.  */
152
  fprintf_filtered (gdb_stdout, "Saved corefile %s\n", corefilename);
153
 
154
  discard_cleanups (old_chain);
155
  bfd_close (obfd);
156
}
157
 
158
static unsigned long
159
default_gcore_mach (void)
160
{
161
#if 1   /* See if this even matters...  */
162
  return 0;
163
#else
164
 
165
  const struct bfd_arch_info *bfdarch = gdbarch_bfd_arch_info (target_gdbarch);
166
 
167
  if (bfdarch != NULL)
168
    return bfdarch->mach;
169
  if (exec_bfd == NULL)
170
    error (_("Can't find default bfd machine type (need execfile)."));
171
 
172
  return bfd_get_mach (exec_bfd);
173
#endif /* 1 */
174
}
175
 
176
static enum bfd_architecture
177
default_gcore_arch (void)
178
{
179
  const struct bfd_arch_info *bfdarch = gdbarch_bfd_arch_info (target_gdbarch);
180
 
181
  if (bfdarch != NULL)
182
    return bfdarch->arch;
183
  if (exec_bfd == NULL)
184
    error (_("Can't find bfd architecture for corefile (need execfile)."));
185
 
186
  return bfd_get_arch (exec_bfd);
187
}
188
 
189
static const char *
190
default_gcore_target (void)
191
{
192
  /* The gdbarch may define a target to use for core files.  */
193
  if (gdbarch_gcore_bfd_target_p (target_gdbarch))
194
    return gdbarch_gcore_bfd_target (target_gdbarch);
195
 
196
  /* Otherwise, try to fall back to the exec_bfd target.  This will probably
197
     not work for non-ELF targets.  */
198
  if (exec_bfd == NULL)
199
    return NULL;
200
  else
201
    return bfd_get_target (exec_bfd);
202
}
203
 
204
/* Derive a reasonable stack segment by unwinding the target stack,
205
   and store its limits in *BOTTOM and *TOP.  Return non-zero if
206
   successful.  */
207
 
208
static int
209
derive_stack_segment (bfd_vma *bottom, bfd_vma *top)
210
{
211
  struct frame_info *fi, *tmp_fi;
212
 
213
  gdb_assert (bottom);
214
  gdb_assert (top);
215
 
216
  /* Can't succeed without stack and registers.  */
217
  if (!target_has_stack || !target_has_registers)
218
    return 0;
219
 
220
  /* Can't succeed without current frame.  */
221
  fi = get_current_frame ();
222
  if (fi == NULL)
223
    return 0;
224
 
225
  /* Save frame pointer of TOS frame.  */
226
  *top = get_frame_base (fi);
227
  /* If current stack pointer is more "inner", use that instead.  */
228
  if (gdbarch_inner_than (get_frame_arch (fi), get_frame_sp (fi), *top))
229
    *top = get_frame_sp (fi);
230
 
231
  /* Find prev-most frame.  */
232
  while ((tmp_fi = get_prev_frame (fi)) != NULL)
233
    fi = tmp_fi;
234
 
235
  /* Save frame pointer of prev-most frame.  */
236
  *bottom = get_frame_base (fi);
237
 
238
  /* Now canonicalize their order, so that BOTTOM is a lower address
239
     (as opposed to a lower stack frame).  */
240
  if (*bottom > *top)
241
    {
242
      bfd_vma tmp_vma;
243
 
244
      tmp_vma = *top;
245
      *top = *bottom;
246
      *bottom = tmp_vma;
247
    }
248
 
249
  return 1;
250
}
251
 
252
/* call_target_sbrk --
253
   helper function for derive_heap_segment.  */
254
 
255
static bfd_vma
256
call_target_sbrk (int sbrk_arg)
257
{
258
  struct objfile *sbrk_objf;
259
  struct gdbarch *gdbarch;
260
  bfd_vma top_of_heap;
261
  struct value *target_sbrk_arg;
262
  struct value *sbrk_fn, *ret;
263
  bfd_vma tmp;
264
 
265
  if (lookup_minimal_symbol ("sbrk", NULL, NULL) != NULL)
266
    {
267
      sbrk_fn = find_function_in_inferior ("sbrk", &sbrk_objf);
268
      if (sbrk_fn == NULL)
269
        return (bfd_vma) 0;
270
    }
271
  else if (lookup_minimal_symbol ("_sbrk", NULL, NULL) != NULL)
272
    {
273
      sbrk_fn = find_function_in_inferior ("_sbrk", &sbrk_objf);
274
      if (sbrk_fn == NULL)
275
        return (bfd_vma) 0;
276
    }
277
  else
278
    return (bfd_vma) 0;
279
 
280
  gdbarch = get_objfile_arch (sbrk_objf);
281
  target_sbrk_arg = value_from_longest (builtin_type (gdbarch)->builtin_int,
282
                                        sbrk_arg);
283
  gdb_assert (target_sbrk_arg);
284
  ret = call_function_by_hand (sbrk_fn, 1, &target_sbrk_arg);
285
  if (ret == NULL)
286
    return (bfd_vma) 0;
287
 
288
  tmp = value_as_long (ret);
289
  if ((LONGEST) tmp <= 0 || (LONGEST) tmp == 0xffffffff)
290
    return (bfd_vma) 0;
291
 
292
  top_of_heap = tmp;
293
  return top_of_heap;
294
}
295
 
296
/* Derive a reasonable heap segment for ABFD by looking at sbrk and
297
   the static data sections.  Store its limits in *BOTTOM and *TOP.
298
   Return non-zero if successful.  */
299
 
300
static int
301
derive_heap_segment (bfd *abfd, bfd_vma *bottom, bfd_vma *top)
302
{
303
  struct gdbarch *gdbarch;
304
  bfd_vma top_of_data_memory = 0;
305
  bfd_vma top_of_heap = 0;
306
  bfd_size_type sec_size;
307
  bfd_vma sec_vaddr;
308
  asection *sec;
309
 
310
  gdb_assert (bottom);
311
  gdb_assert (top);
312
 
313
  /* This function depends on being able to call a function in the
314
     inferior.  */
315
  if (!target_has_execution)
316
    return 0;
317
 
318
  /* The following code assumes that the link map is arranged as
319
     follows (low to high addresses):
320
 
321
     ---------------------------------
322
     | text sections                 |
323
     ---------------------------------
324
     | data sections (including bss) |
325
     ---------------------------------
326
     | heap                          |
327
     --------------------------------- */
328
 
329
  for (sec = abfd->sections; sec; sec = sec->next)
330
    {
331
      if (bfd_get_section_flags (abfd, sec) & SEC_DATA
332
          || strcmp (".bss", bfd_section_name (abfd, sec)) == 0)
333
        {
334
          sec_vaddr = bfd_get_section_vma (abfd, sec);
335
          sec_size = bfd_get_section_size (sec);
336
          if (sec_vaddr + sec_size > top_of_data_memory)
337
            top_of_data_memory = sec_vaddr + sec_size;
338
        }
339
    }
340
 
341
  top_of_heap = call_target_sbrk (0);
342
  if (top_of_heap == (bfd_vma) 0)
343
    return 0;
344
 
345
  /* Return results.  */
346
  if (top_of_heap > top_of_data_memory)
347
    {
348
      *bottom = top_of_data_memory;
349
      *top = top_of_heap;
350
      return 1;
351
    }
352
 
353
  /* No additional heap space needs to be saved.  */
354
  return 0;
355
}
356
 
357
static void
358
make_output_phdrs (bfd *obfd, asection *osec, void *ignored)
359
{
360
  int p_flags = 0;
361
  int p_type = 0;
362
 
363
  /* FIXME: these constants may only be applicable for ELF.  */
364
  if (strncmp (bfd_section_name (obfd, osec), "load", 4) == 0)
365
    p_type = PT_LOAD;
366
  else if (strncmp (bfd_section_name (obfd, osec), "note", 4) == 0)
367
    p_type = PT_NOTE;
368
  else
369
    p_type = PT_NULL;
370
 
371
  p_flags |= PF_R;      /* Segment is readable.  */
372
  if (!(bfd_get_section_flags (obfd, osec) & SEC_READONLY))
373
    p_flags |= PF_W;    /* Segment is writable.  */
374
  if (bfd_get_section_flags (obfd, osec) & SEC_CODE)
375
    p_flags |= PF_X;    /* Segment is executable.  */
376
 
377
  bfd_record_phdr (obfd, p_type, 1, p_flags, 0, 0, 0, 0, 1, &osec);
378
}
379
 
380
static int
381
gcore_create_callback (CORE_ADDR vaddr, unsigned long size,
382
                       int read, int write, int exec, void *data)
383
{
384
  bfd *obfd = data;
385
  asection *osec;
386
  flagword flags = SEC_ALLOC | SEC_HAS_CONTENTS | SEC_LOAD;
387
 
388
  /* If the memory segment has no permissions set, ignore it, otherwise
389
     when we later try to access it for read/write, we'll get an error
390
     or jam the kernel.  */
391
  if (read == 0 && write == 0 && exec == 0)
392
    {
393
      if (info_verbose)
394
        {
395
          fprintf_filtered (gdb_stdout, "Ignore segment, %s bytes at %s\n",
396
                            plongest (size), paddress (target_gdbarch, vaddr));
397
        }
398
 
399
      return 0;
400
    }
401
 
402
  if (write == 0 && !solib_keep_data_in_core (vaddr, size))
403
    {
404
      /* See if this region of memory lies inside a known file on disk.
405
         If so, we can avoid copying its contents by clearing SEC_LOAD.  */
406
      struct objfile *objfile;
407
      struct obj_section *objsec;
408
 
409
      ALL_OBJSECTIONS (objfile, objsec)
410
        {
411
          bfd *abfd = objfile->obfd;
412
          asection *asec = objsec->the_bfd_section;
413
          bfd_vma align = (bfd_vma) 1 << bfd_get_section_alignment (abfd,
414
                                                                    asec);
415
          bfd_vma start = obj_section_addr (objsec) & -align;
416
          bfd_vma end = (obj_section_endaddr (objsec) + align - 1) & -align;
417
          /* Match if either the entire memory region lies inside the
418
             section (i.e. a mapping covering some pages of a large
419
             segment) or the entire section lies inside the memory region
420
             (i.e. a mapping covering multiple small sections).
421
 
422
             This BFD was synthesized from reading target memory,
423
             we don't want to omit that.  */
424
          if (((vaddr >= start && vaddr + size <= end)
425
               || (start >= vaddr && end <= vaddr + size))
426
              && !(bfd_get_file_flags (abfd) & BFD_IN_MEMORY))
427
            {
428
              flags &= ~SEC_LOAD;
429
              flags |= SEC_NEVER_LOAD;
430
              goto keep;        /* break out of two nested for loops */
431
            }
432
        }
433
 
434
    keep:
435
      flags |= SEC_READONLY;
436
    }
437
 
438
  if (exec)
439
    flags |= SEC_CODE;
440
  else
441
    flags |= SEC_DATA;
442
 
443
  osec = bfd_make_section_anyway_with_flags (obfd, "load", flags);
444
  if (osec == NULL)
445
    {
446
      warning (_("Couldn't make gcore segment: %s"),
447
               bfd_errmsg (bfd_get_error ()));
448
      return 1;
449
    }
450
 
451
  if (info_verbose)
452
    {
453
      fprintf_filtered (gdb_stdout, "Save segment, %s bytes at %s\n",
454
                        plongest (size), paddress (target_gdbarch, vaddr));
455
    }
456
 
457
  bfd_set_section_size (obfd, osec, size);
458
  bfd_set_section_vma (obfd, osec, vaddr);
459
  bfd_section_lma (obfd, osec) = 0; /* ??? bfd_set_section_lma?  */
460
  return 0;
461
}
462
 
463
static int
464
objfile_find_memory_regions (int (*func) (CORE_ADDR, unsigned long,
465
                                          int, int, int, void *),
466
                             void *obfd)
467
{
468
  /* Use objfile data to create memory sections.  */
469
  struct objfile *objfile;
470
  struct obj_section *objsec;
471
  bfd_vma temp_bottom, temp_top;
472
 
473
  /* Call callback function for each objfile section.  */
474
  ALL_OBJSECTIONS (objfile, objsec)
475
    {
476
      bfd *ibfd = objfile->obfd;
477
      asection *isec = objsec->the_bfd_section;
478
      flagword flags = bfd_get_section_flags (ibfd, isec);
479
      int ret;
480
 
481
      if ((flags & SEC_ALLOC) || (flags & SEC_LOAD))
482
        {
483
          int size = bfd_section_size (ibfd, isec);
484
          int ret;
485
 
486
          ret = (*func) (obj_section_addr (objsec), bfd_section_size (ibfd, isec),
487
                         1, /* All sections will be readable.  */
488
                         (flags & SEC_READONLY) == 0, /* Writable.  */
489
                         (flags & SEC_CODE) != 0, /* Executable.  */
490
                         obfd);
491
          if (ret != 0)
492
            return ret;
493
        }
494
    }
495
 
496
  /* Make a stack segment.  */
497
  if (derive_stack_segment (&temp_bottom, &temp_top))
498
    (*func) (temp_bottom, temp_top - temp_bottom,
499
             1, /* Stack section will be readable.  */
500
             1, /* Stack section will be writable.  */
501
             0, /* Stack section will not be executable.  */
502
             obfd);
503
 
504
  /* Make a heap segment. */
505
  if (derive_heap_segment (exec_bfd, &temp_bottom, &temp_top))
506
    (*func) (temp_bottom, temp_top - temp_bottom,
507
             1, /* Heap section will be readable.  */
508
             1, /* Heap section will be writable.  */
509
             0, /* Heap section will not be executable.  */
510
             obfd);
511
 
512
  return 0;
513
}
514
 
515
static void
516
gcore_copy_callback (bfd *obfd, asection *osec, void *ignored)
517
{
518
  bfd_size_type size, total_size = bfd_section_size (obfd, osec);
519
  file_ptr offset = 0;
520
  struct cleanup *old_chain = NULL;
521
  void *memhunk;
522
 
523
  /* Read-only sections are marked; we don't have to copy their contents.  */
524
  if ((bfd_get_section_flags (obfd, osec) & SEC_LOAD) == 0)
525
    return;
526
 
527
  /* Only interested in "load" sections.  */
528
  if (strncmp ("load", bfd_section_name (obfd, osec), 4) != 0)
529
    return;
530
 
531
  size = min (total_size, MAX_COPY_BYTES);
532
  memhunk = xmalloc (size);
533
  old_chain = make_cleanup (xfree, memhunk);
534
 
535
  while (total_size > 0)
536
    {
537
      if (size > total_size)
538
        size = total_size;
539
 
540
      if (target_read_memory (bfd_section_vma (obfd, osec) + offset,
541
                              memhunk, size) != 0)
542
        {
543
          warning (_("Memory read failed for corefile section, %s bytes at %s."),
544
                   plongest (size),
545
                   paddress (target_gdbarch, bfd_section_vma (obfd, osec)));
546
          break;
547
        }
548
      if (!bfd_set_section_contents (obfd, osec, memhunk, offset, size))
549
        {
550
          warning (_("Failed to write corefile contents (%s)."),
551
                   bfd_errmsg (bfd_get_error ()));
552
          break;
553
        }
554
 
555
      total_size -= size;
556
      offset += size;
557
    }
558
 
559
  do_cleanups (old_chain);      /* Frees MEMHUNK.  */
560
}
561
 
562
static int
563
gcore_memory_sections (bfd *obfd)
564
{
565
  if (target_find_memory_regions (gcore_create_callback, obfd) != 0)
566
    return 0;                    /* FIXME: error return/msg?  */
567
 
568
  /* Record phdrs for section-to-segment mapping.  */
569
  bfd_map_over_sections (obfd, make_output_phdrs, NULL);
570
 
571
  /* Copy memory region contents.  */
572
  bfd_map_over_sections (obfd, gcore_copy_callback, NULL);
573
 
574
  return 1;
575
}
576
 
577
/* Provide a prototype to silence -Wmissing-prototypes.  */
578
extern initialize_file_ftype _initialize_gcore;
579
 
580
void
581
_initialize_gcore (void)
582
{
583
  add_com ("generate-core-file", class_files, gcore_command, _("\
584
Save a core file with the current state of the debugged process.\n\
585
Argument is optional filename.  Default filename is 'core.<process_id>'."));
586
 
587
  add_com_alias ("gcore", "generate-core-file", class_files, 1);
588
  exec_set_find_memory_regions (objfile_find_memory_regions);
589
}

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