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[binutils.git] / bfd / cisco-core.c
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1 /* BFD back-end for CISCO crash dumps.
2 Copyright 1994, 1997, 1999, 2000, 2001, 2002, 2004, 2006, 2007
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
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>
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
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 */
49 #define CRASH_MAGIC 0xdead1234
50 #define MASK_ADDR(x) ((x) & 0x0fffffff) /* Mask crash info address */
52 typedef enum {
53 CRASH_REASON_NOTCRASHED = 0,
54 CRASH_REASON_EXCEPTION = 1,
55 CRASH_REASON_CORRUPT = 2,
56 } crashreason;
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;
70 struct cisco_core_struct
72 int sig;
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
81 /* Examine the file for a crash info struct at the offset given by
82 CRASH_INFO_LOC. */
84 static const bfd_target *
85 cisco_core_file_validate (abfd, crash_info_loc)
86 bfd *abfd;
87 int crash_info_loc;
89 char buf[4];
90 unsigned int crashinfo_offset;
91 crashinfo_external crashinfo;
92 bfd_size_type nread;
93 unsigned int magic;
94 unsigned int version;
95 unsigned int rambase;
96 sec_ptr asect;
97 struct stat statbuf;
98 bfd_size_type amt;
99 flagword flags;
101 if (bfd_seek (abfd, (file_ptr) crash_info_loc, SEEK_SET) != 0)
102 return NULL;
104 nread = bfd_bread (buf, (bfd_size_type) 4, abfd);
105 if (nread != 4)
107 if (bfd_get_error () != bfd_error_system_call)
108 bfd_set_error (bfd_error_wrong_format);
109 return NULL;
111 crashinfo_offset = MASK_ADDR (bfd_get_32 (abfd, buf));
113 if (bfd_seek (abfd, (file_ptr) crashinfo_offset, SEEK_SET) != 0)
115 /* Most likely we failed because of a bogus (huge) offset */
116 bfd_set_error (bfd_error_wrong_format);
117 return NULL;
120 nread = bfd_bread (&crashinfo, (bfd_size_type) sizeof (crashinfo), abfd);
121 if (nread != sizeof (crashinfo))
123 if (bfd_get_error () != bfd_error_system_call)
124 bfd_set_error (bfd_error_wrong_format);
125 return NULL;
128 if (bfd_stat (abfd, &statbuf) < 0)
130 bfd_set_error (bfd_error_system_call);
131 return NULL;
134 magic = bfd_get_32 (abfd, crashinfo.magic);
135 if (magic != CRASH_MAGIC)
137 bfd_set_error (bfd_error_wrong_format);
138 return NULL;
141 version = bfd_get_32 (abfd, crashinfo.version);
142 if (version == 0)
144 bfd_set_error (bfd_error_wrong_format);
145 return NULL;
147 else if (version == 1)
149 /* V1 core dumps don't specify the dump base, assume 0 */
150 rambase = 0;
152 else
154 rambase = bfd_get_32 (abfd, crashinfo.rambase);
157 /* OK, we believe you. You're a core file. */
159 amt = sizeof (struct cisco_core_struct);
160 abfd->tdata.cisco_core_data = (struct cisco_core_struct *) bfd_zmalloc (amt);
161 if (abfd->tdata.cisco_core_data == NULL)
162 return NULL;
164 switch ((crashreason) bfd_get_32 (abfd, crashinfo.reason))
166 case CRASH_REASON_NOTCRASHED:
167 /* Crash file probably came from write core. */
168 abfd->tdata.cisco_core_data->sig = 0;
169 break;
170 case CRASH_REASON_CORRUPT:
171 /* The crash context area was corrupt -- proceed with caution.
172 We have no way of passing this information back to the caller. */
173 abfd->tdata.cisco_core_data->sig = 0;
174 break;
175 case CRASH_REASON_EXCEPTION:
176 /* Crash occured due to CPU exception. */
178 /* This is 68k-specific; for MIPS we'll need to interpret
179 cpu_vector differently based on the target configuration
180 (since CISCO core files don't seem to have the processor
181 encoded in them). */
183 switch (bfd_get_32 (abfd, crashinfo.cpu_vector))
185 /* bus error */
186 case 2 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
187 /* address error */
188 case 3 : abfd->tdata.cisco_core_data->sig = SIGBUS; break;
189 /* illegal instruction */
190 case 4 : abfd->tdata.cisco_core_data->sig = SIGILL; break;
191 /* zero divide */
192 case 5 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
193 /* chk instruction */
194 case 6 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
195 /* trapv instruction */
196 case 7 : abfd->tdata.cisco_core_data->sig = SIGFPE; break;
197 /* privilege violation */
198 case 8 : abfd->tdata.cisco_core_data->sig = SIGSEGV; break;
199 /* trace trap */
200 case 9 : abfd->tdata.cisco_core_data->sig = SIGTRAP; break;
201 /* line 1010 emulator */
202 case 10: abfd->tdata.cisco_core_data->sig = SIGILL; break;
203 /* line 1111 emulator */
204 case 11: abfd->tdata.cisco_core_data->sig = SIGILL; break;
206 /* Coprocessor protocol violation. Using a standard MMU or FPU
207 this cannot be triggered by software. Call it a SIGBUS. */
208 case 13: abfd->tdata.cisco_core_data->sig = SIGBUS; break;
210 /* interrupt */
211 case 31: abfd->tdata.cisco_core_data->sig = SIGINT; break;
212 /* breakpoint */
213 case 33: abfd->tdata.cisco_core_data->sig = SIGTRAP; break;
215 /* floating point err */
216 case 48: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
217 /* floating point err */
218 case 49: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
219 /* zero divide */
220 case 50: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
221 /* underflow */
222 case 51: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
223 /* operand error */
224 case 52: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
225 /* overflow */
226 case 53: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
227 /* NAN */
228 case 54: abfd->tdata.cisco_core_data->sig = SIGFPE; break;
229 default:
230 #ifndef SIGEMT
231 #define SIGEMT SIGTRAP
232 #endif
233 /* "software generated"*/
234 abfd->tdata.cisco_core_data->sig = SIGEMT;
236 break;
237 default:
238 /* Unknown crash reason. */
239 abfd->tdata.cisco_core_data->sig = 0;
240 break;
243 /* Create a ".data" section that maps the entire file, which is
244 essentially a dump of the target system's RAM. */
246 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS;
247 asect = bfd_make_section_anyway_with_flags (abfd, ".data", flags);
248 if (asect == NULL)
249 goto error_return;
250 /* The size of memory is the size of the core file itself. */
251 asect->size = statbuf.st_size;
252 asect->vma = rambase;
253 asect->filepos = 0;
255 /* Create a ".crash" section to allow access to the saved
256 crash information. */
258 flags = SEC_HAS_CONTENTS;
259 asect = bfd_make_section_anyway_with_flags (abfd, ".crash", flags);
260 if (asect == NULL)
261 goto error_return;
262 asect->vma = 0;
263 asect->filepos = crashinfo_offset;
264 asect->size = sizeof (crashinfo);
266 /* Create a ".reg" section to allow access to the saved
267 registers. */
269 asect = bfd_make_section_anyway_with_flags (abfd, ".reg", flags);
270 if (asect == NULL)
271 goto error_return;
272 asect->vma = 0;
273 asect->filepos = bfd_get_32 (abfd, crashinfo.registers) - rambase;
274 /* Since we don't know the exact size of the saved register info,
275 choose a register section size that is either the remaining part
276 of the file, or 1024, whichever is smaller. */
277 nread = statbuf.st_size - asect->filepos;
278 asect->size = (nread < 1024) ? nread : 1024;
280 return abfd->xvec;
282 /* Get here if we have already started filling out the BFD
283 and there is an error of some kind. */
285 error_return:
286 bfd_release (abfd, abfd->tdata.any);
287 abfd->tdata.any = NULL;
288 bfd_section_list_clear (abfd);
289 return NULL;
292 static const bfd_target *
293 cisco_core_file_p (abfd)
294 bfd *abfd;
296 int *crash_info_locp;
297 const bfd_target *target = NULL;
299 for (crash_info_locp = crash_info_locs;
300 *crash_info_locp != -1 && target == NULL;
301 crash_info_locp++)
303 target = cisco_core_file_validate (abfd, *crash_info_locp);
305 return (target);
308 char *
309 cisco_core_file_failing_command (abfd)
310 bfd *abfd ATTRIBUTE_UNUSED;
312 return NULL;
316 cisco_core_file_failing_signal (abfd)
317 bfd *abfd ATTRIBUTE_UNUSED;
319 return abfd->tdata.cisco_core_data->sig;
322 extern const bfd_target cisco_core_little_vec;
324 const bfd_target cisco_core_big_vec =
326 "cisco-ios-core-big",
327 bfd_target_unknown_flavour,
328 BFD_ENDIAN_BIG, /* target byte order */
329 BFD_ENDIAN_BIG, /* target headers byte order */
330 (HAS_RELOC | EXEC_P | /* object flags */
331 HAS_LINENO | HAS_DEBUG |
332 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
333 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
334 0, /* symbol prefix */
335 ' ', /* ar_pad_char */
336 16, /* ar_max_namelen */
337 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
338 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
339 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
340 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
341 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
342 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
344 { /* bfd_check_format */
345 _bfd_dummy_target, /* unknown format */
346 _bfd_dummy_target, /* object file */
347 _bfd_dummy_target, /* archive */
348 cisco_core_file_p /* a core file */
350 { /* bfd_set_format */
351 bfd_false, bfd_false,
352 bfd_false, bfd_false
354 { /* bfd_write_contents */
355 bfd_false, bfd_false,
356 bfd_false, bfd_false
359 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
360 BFD_JUMP_TABLE_COPY (_bfd_generic),
361 BFD_JUMP_TABLE_CORE (cisco),
362 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
363 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
364 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
365 BFD_JUMP_TABLE_WRITE (_bfd_generic),
366 BFD_JUMP_TABLE_LINK (_bfd_nolink),
367 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
369 & cisco_core_little_vec,
371 (PTR) 0 /* backend_data */
374 const bfd_target cisco_core_little_vec =
376 "cisco-ios-core-little",
377 bfd_target_unknown_flavour,
378 BFD_ENDIAN_LITTLE, /* target byte order */
379 BFD_ENDIAN_LITTLE, /* target headers byte order */
380 (HAS_RELOC | EXEC_P | /* object flags */
381 HAS_LINENO | HAS_DEBUG |
382 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
383 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
384 0, /* symbol prefix */
385 ' ', /* ar_pad_char */
386 16, /* ar_max_namelen */
387 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
388 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
389 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
390 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
391 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
392 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
394 { /* bfd_check_format */
395 _bfd_dummy_target, /* unknown format */
396 _bfd_dummy_target, /* object file */
397 _bfd_dummy_target, /* archive */
398 cisco_core_file_p /* a core file */
400 { /* bfd_set_format */
401 bfd_false, bfd_false,
402 bfd_false, bfd_false
404 { /* bfd_write_contents */
405 bfd_false, bfd_false,
406 bfd_false, bfd_false
409 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
410 BFD_JUMP_TABLE_COPY (_bfd_generic),
411 BFD_JUMP_TABLE_CORE (cisco),
412 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
413 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
414 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
415 BFD_JUMP_TABLE_WRITE (_bfd_generic),
416 BFD_JUMP_TABLE_LINK (_bfd_nolink),
417 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
419 &cisco_core_big_vec,
421 (PTR) 0 /* backend_data */