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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [bfd/] [cisco-core.c] - Blame information for rev 14

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1 14 khays
/* BFD back-end for CISCO crash dumps.
2
   Copyright 1994, 1997, 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2010
3
   Free Software Foundation, Inc.
4
 
5
   This file is part of BFD, the Binary File Descriptor library.
6
 
7
   This program is free software; you can redistribute it and/or modify
8
   it under the terms of the GNU General Public License as published by
9
   the Free Software Foundation; either version 3 of the License, or
10
   (at your option) any later version.
11
 
12
   This program is distributed in the hope that it will be useful,
13
   but WITHOUT ANY WARRANTY; without even the implied warranty of
14
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
   GNU General Public License for more details.
16
 
17
   You should have received a copy of the GNU General Public License
18
   along with this program; if not, write to the Free Software
19
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20
   MA 02110-1301, USA.  */
21
 
22
#include "sysdep.h"
23
#include "bfd.h"
24
#include "libbfd.h"
25
/* core_file_failing_signal returns a host signal (this probably should
26
   be fixed).  */
27
#include <signal.h>
28
 
29
/* for MSVC builds */
30
#ifndef SIGTRAP
31
# define SIGTRAP 5
32
#endif
33
#ifndef SIGEMT
34
# define SIGEMT 6
35
#endif
36
#ifndef SIGBUS
37
# define SIGBUS 10
38
#endif
39
 
40
int crash_info_locs[] = {
41
  0x0250,       /* mips, ppc, x86, i960 */
42
  0x0400,       /* m68k, mips, x86, i960 */
43
  0x0FFC,       /* m68k, mips, ppc, x86, i960 */
44
  0x3000,       /* ppc */
45
  0x4FFC,       /* m68k */
46
  -1
47
};
48
 
49
#define CRASH_MAGIC     0xdead1234
50
#define MASK_ADDR(x)    ((x) & 0x0fffffff)      /* Mask crash info address */
51
 
52
typedef enum {
53
    CRASH_REASON_NOTCRASHED = 0,
54
    CRASH_REASON_EXCEPTION = 1,
55
    CRASH_REASON_CORRUPT = 2,
56
} crashreason;
57
 
58
typedef struct {
59
  char magic[4];                /* Magic number */
60
  char version[4];              /* Version number */
61
  char reason[4];               /* Crash reason */
62
  char cpu_vector[4];           /* CPU vector for exceptions */
63
  char registers[4];            /* Pointer to saved registers */
64
  char rambase[4];              /* Base of RAM (not in V1 crash info) */
65
  char textbase[4];             /* Base of .text section (not in V3 crash info) */
66
  char database[4];             /* Base of .data section (not in V3 crash info) */
67
  char bssbase[4];              /* Base of .bss section (not in V3 crash info) */
68
} crashinfo_external;
69
 
70
struct cisco_core_struct
71
{
72
  int sig;
73
};
74
 
75
static const bfd_target *cisco_core_file_validate PARAMS ((bfd *, int));
76
static const bfd_target *cisco_core_file_p PARAMS ((bfd *));
77
char *cisco_core_file_failing_command PARAMS ((bfd *));
78
int cisco_core_file_failing_signal PARAMS ((bfd *));
79
#define cisco_core_file_matches_executable_p generic_core_file_matches_executable_p
80
#define cisco_core_file_pid _bfd_nocore_core_file_pid
81
 
82
/* Examine the file for a crash info struct at the offset given by
83
   CRASH_INFO_LOC.  */
84
 
85
static const bfd_target *
86
cisco_core_file_validate (abfd, crash_info_loc)
87
     bfd *abfd;
88
     int crash_info_loc;
89
{
90
  char buf[4];
91
  unsigned int crashinfo_offset;
92
  crashinfo_external crashinfo;
93
  bfd_size_type nread;
94
  unsigned int magic;
95
  unsigned int version;
96
  unsigned int rambase;
97
  sec_ptr asect;
98
  struct stat statbuf;
99
  bfd_size_type amt;
100
  flagword flags;
101
 
102
  if (bfd_seek (abfd, (file_ptr) crash_info_loc, SEEK_SET) != 0)
103
    return NULL;
104
 
105
  nread = bfd_bread (buf, (bfd_size_type) 4, abfd);
106
  if (nread != 4)
107
    {
108
      if (bfd_get_error () != bfd_error_system_call)
109
        bfd_set_error (bfd_error_wrong_format);
110
      return NULL;
111
    }
112
  crashinfo_offset = MASK_ADDR (bfd_get_32 (abfd, buf));
113
 
114
  if (bfd_seek (abfd, (file_ptr) crashinfo_offset, SEEK_SET) != 0)
115
    {
116
      /* Most likely we failed because of a bogus (huge) offset */
117
      bfd_set_error (bfd_error_wrong_format);
118
      return NULL;
119
    }
120
 
121
  nread = bfd_bread (&crashinfo, (bfd_size_type) sizeof (crashinfo), abfd);
122
  if (nread != sizeof (crashinfo))
123
    {
124
      if (bfd_get_error () != bfd_error_system_call)
125
        bfd_set_error (bfd_error_wrong_format);
126
      return NULL;
127
    }
128
 
129
  if (bfd_stat (abfd, &statbuf) < 0)
130
    {
131
      bfd_set_error (bfd_error_system_call);
132
      return NULL;
133
    }
134
 
135
  magic = bfd_get_32 (abfd, crashinfo.magic);
136
  if (magic != CRASH_MAGIC)
137
    {
138
      bfd_set_error (bfd_error_wrong_format);
139
      return NULL;
140
    }
141
 
142
  version = bfd_get_32 (abfd, crashinfo.version);
143
  if (version == 0)
144
    {
145
      bfd_set_error (bfd_error_wrong_format);
146
      return NULL;
147
    }
148
  else if (version == 1)
149
    {
150
      /* V1 core dumps don't specify the dump base, assume 0 */
151
      rambase = 0;
152
    }
153
  else
154
    {
155
      rambase = bfd_get_32 (abfd, crashinfo.rambase);
156
    }
157
 
158
  /* OK, we believe you.  You're a core file.  */
159
 
160
  amt = sizeof (struct cisco_core_struct);
161
  abfd->tdata.cisco_core_data = (struct cisco_core_struct *) bfd_zmalloc (amt);
162
  if (abfd->tdata.cisco_core_data == NULL)
163
    return NULL;
164
 
165
  switch ((crashreason) bfd_get_32 (abfd, crashinfo.reason))
166
    {
167
    case CRASH_REASON_NOTCRASHED:
168
      /* Crash file probably came from write core.  */
169
      abfd->tdata.cisco_core_data->sig = 0;
170
      break;
171
    case CRASH_REASON_CORRUPT:
172
      /* The crash context area was corrupt -- proceed with caution.
173
         We have no way of passing this information back to the caller.  */
174
      abfd->tdata.cisco_core_data->sig = 0;
175
      break;
176
    case CRASH_REASON_EXCEPTION:
177
      /* Crash occured due to CPU exception.  */
178
 
179
      /* This is 68k-specific; for MIPS we'll need to interpret
180
         cpu_vector differently based on the target configuration
181
         (since CISCO core files don't seem to have the processor
182
         encoded in them).  */
183
 
184
      switch (bfd_get_32 (abfd, crashinfo.cpu_vector))
185
        {
186
           /* bus error           */
187
        case 2 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
188
           /* address error       */
189
        case 3 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
190
           /* illegal instruction */
191
        case 4 : abfd->tdata.cisco_core_data->sig = SIGILL;  break;
192
           /* zero divide         */
193
        case 5 : abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
194
           /* chk instruction     */
195
        case 6 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
196
           /* trapv instruction   */
197
        case 7 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
198
           /* privilege violation */
199
        case 8 : abfd->tdata.cisco_core_data->sig = SIGSEGV; break;
200
           /* trace trap          */
201
        case 9 : abfd->tdata.cisco_core_data->sig = SIGTRAP;  break;
202
           /* line 1010 emulator  */
203
        case 10: abfd->tdata.cisco_core_data->sig = SIGILL;  break;
204
           /* line 1111 emulator  */
205
        case 11: abfd->tdata.cisco_core_data->sig = SIGILL;  break;
206
 
207
          /* Coprocessor protocol violation.  Using a standard MMU or FPU
208
             this cannot be triggered by software.  Call it a SIGBUS.  */
209
        case 13: abfd->tdata.cisco_core_data->sig = SIGBUS;  break;
210
 
211
          /* interrupt           */
212
        case 31: abfd->tdata.cisco_core_data->sig = SIGINT;  break;
213
          /* breakpoint          */
214
        case 33: abfd->tdata.cisco_core_data->sig = SIGTRAP;  break;
215
 
216
          /* floating point err  */
217
        case 48: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
218
          /* floating point err  */
219
        case 49: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
220
          /* zero divide         */
221
        case 50: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
222
          /* underflow           */
223
        case 51: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
224
          /* operand error       */
225
        case 52: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
226
           /* overflow            */
227
        case 53: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
228
          /* NAN                 */
229
        case 54: abfd->tdata.cisco_core_data->sig = SIGFPE;  break;
230
        default:
231
#ifndef SIGEMT
232
#define SIGEMT SIGTRAP
233
#endif
234
          /* "software generated"*/
235
          abfd->tdata.cisco_core_data->sig = SIGEMT;
236
        }
237
      break;
238
    default:
239
      /* Unknown crash reason.  */
240
      abfd->tdata.cisco_core_data->sig = 0;
241
      break;
242
    }
243
 
244
  /* Create a ".data" section that maps the entire file, which is
245
     essentially a dump of the target system's RAM.  */
246
 
247
  flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
248
  asect = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
249
  if (asect == NULL)
250
    goto error_return;
251
  /* The size of memory is the size of the core file itself.  */
252
  asect->size = statbuf.st_size;
253
  asect->vma = rambase;
254
  asect->filepos = 0;
255
 
256
  /* Create a ".crash" section to allow access to the saved
257
     crash information.  */
258
 
259
  flags = SEC_HAS_CONTENTS;
260
  asect = bfd_make_section_anyway_with_flags (abfd, ".crash", flags);
261
  if (asect == NULL)
262
    goto error_return;
263
  asect->vma = 0;
264
  asect->filepos = crashinfo_offset;
265
  asect->size = sizeof (crashinfo);
266
 
267
  /* Create a ".reg" section to allow access to the saved
268
     registers.  */
269
 
270
  asect = bfd_make_section_anyway_with_flags (abfd, ".reg", flags);
271
  if (asect == NULL)
272
    goto error_return;
273
  asect->vma = 0;
274
  asect->filepos = bfd_get_32 (abfd, crashinfo.registers) - rambase;
275
  /* Since we don't know the exact size of the saved register info,
276
     choose a register section size that is either the remaining part
277
     of the file, or 1024, whichever is smaller.  */
278
  nread = statbuf.st_size - asect->filepos;
279
  asect->size = (nread < 1024) ? nread : 1024;
280
 
281
  return abfd->xvec;
282
 
283
  /* Get here if we have already started filling out the BFD
284
     and there is an error of some kind.  */
285
 
286
 error_return:
287
  bfd_release (abfd, abfd->tdata.any);
288
  abfd->tdata.any = NULL;
289
  bfd_section_list_clear (abfd);
290
  return NULL;
291
}
292
 
293
static const bfd_target *
294
cisco_core_file_p (abfd)
295
     bfd *abfd;
296
{
297
  int *crash_info_locp;
298
  const bfd_target *target = NULL;
299
 
300
  for (crash_info_locp = crash_info_locs;
301
       *crash_info_locp != -1  &&  target == NULL;
302
       crash_info_locp++)
303
    {
304
      target = cisco_core_file_validate (abfd, *crash_info_locp);
305
    }
306
  return (target);
307
}
308
 
309
char *
310
cisco_core_file_failing_command (abfd)
311
     bfd *abfd ATTRIBUTE_UNUSED;
312
{
313
  return NULL;
314
}
315
 
316
int
317
cisco_core_file_failing_signal (abfd)
318
     bfd *abfd ATTRIBUTE_UNUSED;
319
{
320
  return abfd->tdata.cisco_core_data->sig;
321
}
322
 
323
extern const bfd_target cisco_core_little_vec;
324
 
325
const bfd_target cisco_core_big_vec =
326
  {
327
    "cisco-ios-core-big",
328
    bfd_target_unknown_flavour,
329
    BFD_ENDIAN_BIG,             /* target byte order */
330
    BFD_ENDIAN_BIG,             /* target headers byte order */
331
    (HAS_RELOC | EXEC_P |       /* object flags */
332
     HAS_LINENO | HAS_DEBUG |
333
     HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
334
    (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
335
    0,                                                      /* symbol prefix */
336
    ' ',                                                   /* ar_pad_char */
337
    16,                                                    /* ar_max_namelen */
338
    bfd_getb64, bfd_getb_signed_64, bfd_putb64,
339
    bfd_getb32, bfd_getb_signed_32, bfd_putb32,
340
    bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
341
    bfd_getb64, bfd_getb_signed_64, bfd_putb64,
342
    bfd_getb32, bfd_getb_signed_32, bfd_putb32,
343
    bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
344
 
345
    {                           /* bfd_check_format */
346
     _bfd_dummy_target,         /* unknown format */
347
     _bfd_dummy_target,         /* object file */
348
     _bfd_dummy_target,         /* archive */
349
     cisco_core_file_p  /* a core file */
350
    },
351
    {                           /* bfd_set_format */
352
     bfd_false, bfd_false,
353
     bfd_false, bfd_false
354
    },
355
    {                           /* bfd_write_contents */
356
     bfd_false, bfd_false,
357
     bfd_false, bfd_false
358
    },
359
 
360
       BFD_JUMP_TABLE_GENERIC (_bfd_generic),
361
       BFD_JUMP_TABLE_COPY (_bfd_generic),
362
       BFD_JUMP_TABLE_CORE (cisco),
363
       BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
364
       BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
365
       BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
366
       BFD_JUMP_TABLE_WRITE (_bfd_generic),
367
       BFD_JUMP_TABLE_LINK (_bfd_nolink),
368
       BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
369
 
370
    & cisco_core_little_vec,
371
 
372
    (PTR) 0                      /* backend_data */
373
};
374
 
375
const bfd_target cisco_core_little_vec =
376
  {
377
    "cisco-ios-core-little",
378
    bfd_target_unknown_flavour,
379
    BFD_ENDIAN_LITTLE,          /* target byte order */
380
    BFD_ENDIAN_LITTLE,          /* target headers byte order */
381
    (HAS_RELOC | EXEC_P |       /* object flags */
382
     HAS_LINENO | HAS_DEBUG |
383
     HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
384
    (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
385
    0,                                                      /* symbol prefix */
386
    ' ',                                                   /* ar_pad_char */
387
    16,                                                    /* ar_max_namelen */
388
    bfd_getl64, bfd_getl_signed_64, bfd_putl64,
389
    bfd_getl32, bfd_getl_signed_32, bfd_putl32,
390
    bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
391
    bfd_getl64, bfd_getl_signed_64, bfd_putl64,
392
    bfd_getl32, bfd_getl_signed_32, bfd_putl32,
393
    bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
394
 
395
    {                           /* bfd_check_format */
396
     _bfd_dummy_target,         /* unknown format */
397
     _bfd_dummy_target,         /* object file */
398
     _bfd_dummy_target,         /* archive */
399
     cisco_core_file_p  /* a core file */
400
    },
401
    {                           /* bfd_set_format */
402
     bfd_false, bfd_false,
403
     bfd_false, bfd_false
404
    },
405
    {                           /* bfd_write_contents */
406
     bfd_false, bfd_false,
407
     bfd_false, bfd_false
408
    },
409
 
410
       BFD_JUMP_TABLE_GENERIC (_bfd_generic),
411
       BFD_JUMP_TABLE_COPY (_bfd_generic),
412
       BFD_JUMP_TABLE_CORE (cisco),
413
       BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
414
       BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
415
       BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
416
       BFD_JUMP_TABLE_WRITE (_bfd_generic),
417
       BFD_JUMP_TABLE_LINK (_bfd_nolink),
418
       BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
419
 
420
    &cisco_core_big_vec,
421
 
422
    (PTR) 0                      /* backend_data */
423
};

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