Commit | Line | Data |
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252b5132 | 1 | /* BFD back-end for CISCO crash dumps. |
a2c58332 | 2 | Copyright (C) 1994-2022 Free Software Foundation, Inc. |
252b5132 | 3 | |
cd123cb7 | 4 | This file is part of BFD, the Binary File Descriptor library. |
252b5132 | 5 | |
cd123cb7 NC |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
252b5132 | 10 | |
cd123cb7 NC |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
252b5132 | 15 | |
cd123cb7 NC |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
252b5132 | 20 | |
252b5132 | 21 | #include "sysdep.h" |
3db64b00 | 22 | #include "bfd.h" |
252b5132 RH |
23 | #include "libbfd.h" |
24 | /* core_file_failing_signal returns a host signal (this probably should | |
25 | be fixed). */ | |
26 | #include <signal.h> | |
27 | ||
28 | /* for MSVC builds */ | |
29 | #ifndef SIGTRAP | |
30 | # define SIGTRAP 5 | |
31 | #endif | |
32 | #ifndef SIGEMT | |
33 | # define SIGEMT 6 | |
34 | #endif | |
35 | #ifndef SIGBUS | |
36 | # define SIGBUS 10 | |
37 | #endif | |
38 | \f | |
2c3fc389 NC |
39 | int crash_info_locs[] = |
40 | { | |
f4bda984 RH |
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 */ | |
252b5132 | 51 | |
2c3fc389 NC |
52 | typedef enum |
53 | { | |
54 | CRASH_REASON_NOTCRASHED = 0, | |
55 | CRASH_REASON_EXCEPTION = 1, | |
56 | CRASH_REASON_CORRUPT = 2, | |
f4bda984 | 57 | } crashreason; |
252b5132 | 58 | |
2c3fc389 NC |
59 | typedef struct |
60 | { | |
f4bda984 | 61 | char magic[4]; /* Magic number */ |
252b5132 RH |
62 | char version[4]; /* Version number */ |
63 | char reason[4]; /* Crash reason */ | |
64 | char cpu_vector[4]; /* CPU vector for exceptions */ | |
65 | char registers[4]; /* Pointer to saved registers */ | |
66 | char rambase[4]; /* Base of RAM (not in V1 crash info) */ | |
f4bda984 RH |
67 | char textbase[4]; /* Base of .text section (not in V3 crash info) */ |
68 | char database[4]; /* Base of .data section (not in V3 crash info) */ | |
69 | char bssbase[4]; /* Base of .bss section (not in V3 crash info) */ | |
70 | } crashinfo_external; | |
dc810e39 | 71 | |
252b5132 RH |
72 | struct cisco_core_struct |
73 | { | |
74 | int sig; | |
75 | }; | |
dc810e39 | 76 | |
69d246d9 | 77 | #define cisco_core_file_matches_executable_p generic_core_file_matches_executable_p |
35e7447c | 78 | #define cisco_core_file_pid _bfd_nocore_core_file_pid |
252b5132 | 79 | \f |
f4bda984 | 80 | /* Examine the file for a crash info struct at the offset given by |
e60b52c6 | 81 | CRASH_INFO_LOC. */ |
f4bda984 | 82 | |
601b73d5 | 83 | static bfd_cleanup |
2c3fc389 | 84 | cisco_core_file_validate (bfd *abfd, int crash_info_loc) |
252b5132 RH |
85 | { |
86 | char buf[4]; | |
87 | unsigned int crashinfo_offset; | |
f4bda984 | 88 | crashinfo_external crashinfo; |
74633dd0 | 89 | bfd_size_type nread; |
f4bda984 RH |
90 | unsigned int magic; |
91 | unsigned int version; | |
252b5132 RH |
92 | unsigned int rambase; |
93 | sec_ptr asect; | |
94 | struct stat statbuf; | |
986f0783 | 95 | size_t amt; |
117ed4f8 | 96 | flagword flags; |
252b5132 | 97 | |
dc810e39 | 98 | if (bfd_seek (abfd, (file_ptr) crash_info_loc, SEEK_SET) != 0) |
252b5132 RH |
99 | return NULL; |
100 | ||
dc810e39 | 101 | nread = bfd_bread (buf, (bfd_size_type) 4, abfd); |
252b5132 RH |
102 | if (nread != 4) |
103 | { | |
104 | if (bfd_get_error () != bfd_error_system_call) | |
105 | bfd_set_error (bfd_error_wrong_format); | |
106 | return NULL; | |
107 | } | |
f4bda984 | 108 | crashinfo_offset = MASK_ADDR (bfd_get_32 (abfd, buf)); |
252b5132 | 109 | |
dc810e39 | 110 | if (bfd_seek (abfd, (file_ptr) crashinfo_offset, SEEK_SET) != 0) |
f4bda984 RH |
111 | { |
112 | /* Most likely we failed because of a bogus (huge) offset */ | |
113 | bfd_set_error (bfd_error_wrong_format); | |
114 | return NULL; | |
115 | } | |
252b5132 | 116 | |
dc810e39 | 117 | nread = bfd_bread (&crashinfo, (bfd_size_type) sizeof (crashinfo), abfd); |
252b5132 RH |
118 | if (nread != sizeof (crashinfo)) |
119 | { | |
120 | if (bfd_get_error () != bfd_error_system_call) | |
121 | bfd_set_error (bfd_error_wrong_format); | |
122 | return NULL; | |
123 | } | |
124 | ||
125 | if (bfd_stat (abfd, &statbuf) < 0) | |
126 | { | |
127 | bfd_set_error (bfd_error_system_call); | |
128 | return NULL; | |
129 | } | |
130 | ||
f4bda984 RH |
131 | magic = bfd_get_32 (abfd, crashinfo.magic); |
132 | if (magic != CRASH_MAGIC) | |
252b5132 RH |
133 | { |
134 | bfd_set_error (bfd_error_wrong_format); | |
135 | return NULL; | |
136 | } | |
137 | ||
f4bda984 RH |
138 | version = bfd_get_32 (abfd, crashinfo.version); |
139 | if (version == 0) | |
252b5132 | 140 | { |
252b5132 RH |
141 | bfd_set_error (bfd_error_wrong_format); |
142 | return NULL; | |
f4bda984 RH |
143 | } |
144 | else if (version == 1) | |
145 | { | |
146 | /* V1 core dumps don't specify the dump base, assume 0 */ | |
252b5132 | 147 | rambase = 0; |
f4bda984 RH |
148 | } |
149 | else | |
150 | { | |
252b5132 | 151 | rambase = bfd_get_32 (abfd, crashinfo.rambase); |
252b5132 RH |
152 | } |
153 | ||
154 | /* OK, we believe you. You're a core file. */ | |
155 | ||
dc810e39 AM |
156 | amt = sizeof (struct cisco_core_struct); |
157 | abfd->tdata.cisco_core_data = (struct cisco_core_struct *) bfd_zmalloc (amt); | |
252b5132 RH |
158 | if (abfd->tdata.cisco_core_data == NULL) |
159 | return NULL; | |
160 | ||
161 | switch ((crashreason) bfd_get_32 (abfd, crashinfo.reason)) | |
162 | { | |
163 | case CRASH_REASON_NOTCRASHED: | |
164 | /* Crash file probably came from write core. */ | |
165 | abfd->tdata.cisco_core_data->sig = 0; | |
166 | break; | |
167 | case CRASH_REASON_CORRUPT: | |
168 | /* The crash context area was corrupt -- proceed with caution. | |
169 | We have no way of passing this information back to the caller. */ | |
170 | abfd->tdata.cisco_core_data->sig = 0; | |
171 | break; | |
172 | case CRASH_REASON_EXCEPTION: | |
173 | /* Crash occured due to CPU exception. */ | |
174 | ||
175 | /* This is 68k-specific; for MIPS we'll need to interpret | |
176 | cpu_vector differently based on the target configuration | |
177 | (since CISCO core files don't seem to have the processor | |
178 | encoded in them). */ | |
179 | ||
180 | switch (bfd_get_32 (abfd, crashinfo.cpu_vector)) | |
181 | { | |
07d6d2b8 | 182 | /* bus error */ |
252b5132 | 183 | case 2 : abfd->tdata.cisco_core_data->sig = SIGBUS; break; |
07d6d2b8 | 184 | /* address error */ |
252b5132 RH |
185 | case 3 : abfd->tdata.cisco_core_data->sig = SIGBUS; break; |
186 | /* illegal instruction */ | |
187 | case 4 : abfd->tdata.cisco_core_data->sig = SIGILL; break; | |
07d6d2b8 | 188 | /* zero divide */ |
252b5132 | 189 | case 5 : abfd->tdata.cisco_core_data->sig = SIGFPE; break; |
07d6d2b8 | 190 | /* chk instruction */ |
252b5132 | 191 | case 6 : abfd->tdata.cisco_core_data->sig = SIGFPE; break; |
07d6d2b8 | 192 | /* trapv instruction */ |
252b5132 RH |
193 | case 7 : abfd->tdata.cisco_core_data->sig = SIGFPE; break; |
194 | /* privilege violation */ | |
195 | case 8 : abfd->tdata.cisco_core_data->sig = SIGSEGV; break; | |
07d6d2b8 | 196 | /* trace trap */ |
252b5132 RH |
197 | case 9 : abfd->tdata.cisco_core_data->sig = SIGTRAP; break; |
198 | /* line 1010 emulator */ | |
199 | case 10: abfd->tdata.cisco_core_data->sig = SIGILL; break; | |
200 | /* line 1111 emulator */ | |
201 | case 11: abfd->tdata.cisco_core_data->sig = SIGILL; break; | |
202 | ||
203 | /* Coprocessor protocol violation. Using a standard MMU or FPU | |
204 | this cannot be triggered by software. Call it a SIGBUS. */ | |
205 | case 13: abfd->tdata.cisco_core_data->sig = SIGBUS; break; | |
206 | ||
07d6d2b8 | 207 | /* interrupt */ |
252b5132 | 208 | case 31: abfd->tdata.cisco_core_data->sig = SIGINT; break; |
07d6d2b8 | 209 | /* breakpoint */ |
252b5132 RH |
210 | case 33: abfd->tdata.cisco_core_data->sig = SIGTRAP; break; |
211 | ||
07d6d2b8 | 212 | /* floating point err */ |
252b5132 | 213 | case 48: abfd->tdata.cisco_core_data->sig = SIGFPE; break; |
07d6d2b8 | 214 | /* floating point err */ |
252b5132 | 215 | case 49: abfd->tdata.cisco_core_data->sig = SIGFPE; break; |
07d6d2b8 | 216 | /* zero divide */ |
252b5132 | 217 | case 50: abfd->tdata.cisco_core_data->sig = SIGFPE; break; |
07d6d2b8 | 218 | /* underflow */ |
252b5132 | 219 | case 51: abfd->tdata.cisco_core_data->sig = SIGFPE; break; |
07d6d2b8 | 220 | /* operand error */ |
252b5132 | 221 | case 52: abfd->tdata.cisco_core_data->sig = SIGFPE; break; |
07d6d2b8 | 222 | /* overflow */ |
252b5132 | 223 | case 53: abfd->tdata.cisco_core_data->sig = SIGFPE; break; |
07d6d2b8 | 224 | /* NAN */ |
252b5132 RH |
225 | case 54: abfd->tdata.cisco_core_data->sig = SIGFPE; break; |
226 | default: | |
227 | #ifndef SIGEMT | |
228 | #define SIGEMT SIGTRAP | |
229 | #endif | |
230 | /* "software generated"*/ | |
231 | abfd->tdata.cisco_core_data->sig = SIGEMT; | |
232 | } | |
233 | break; | |
234 | default: | |
235 | /* Unknown crash reason. */ | |
236 | abfd->tdata.cisco_core_data->sig = 0; | |
237 | break; | |
238 | } | |
239 | ||
9e7b37b3 AM |
240 | /* Create a ".data" section that maps the entire file, which is |
241 | essentially a dump of the target system's RAM. */ | |
f4bda984 | 242 | |
117ed4f8 AM |
243 | flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; |
244 | asect = bfd_make_section_anyway_with_flags (abfd, ".data", flags); | |
252b5132 RH |
245 | if (asect == NULL) |
246 | goto error_return; | |
9e7b37b3 | 247 | /* The size of memory is the size of the core file itself. */ |
eea6121a | 248 | asect->size = statbuf.st_size; |
9e7b37b3 AM |
249 | asect->vma = rambase; |
250 | asect->filepos = 0; | |
252b5132 | 251 | |
f4bda984 | 252 | /* Create a ".crash" section to allow access to the saved |
e60b52c6 | 253 | crash information. */ |
f4bda984 | 254 | |
117ed4f8 AM |
255 | flags = SEC_HAS_CONTENTS; |
256 | asect = bfd_make_section_anyway_with_flags (abfd, ".crash", flags); | |
f4bda984 RH |
257 | if (asect == NULL) |
258 | goto error_return; | |
f4bda984 RH |
259 | asect->vma = 0; |
260 | asect->filepos = crashinfo_offset; | |
eea6121a | 261 | asect->size = sizeof (crashinfo); |
f4bda984 | 262 | |
9e7b37b3 AM |
263 | /* Create a ".reg" section to allow access to the saved |
264 | registers. */ | |
f4bda984 | 265 | |
117ed4f8 | 266 | asect = bfd_make_section_anyway_with_flags (abfd, ".reg", flags); |
252b5132 RH |
267 | if (asect == NULL) |
268 | goto error_return; | |
9e7b37b3 AM |
269 | asect->vma = 0; |
270 | asect->filepos = bfd_get_32 (abfd, crashinfo.registers) - rambase; | |
271 | /* Since we don't know the exact size of the saved register info, | |
272 | choose a register section size that is either the remaining part | |
273 | of the file, or 1024, whichever is smaller. */ | |
274 | nread = statbuf.st_size - asect->filepos; | |
eea6121a | 275 | asect->size = (nread < 1024) ? nread : 1024; |
252b5132 | 276 | |
601b73d5 | 277 | return _bfd_no_cleanup; |
252b5132 | 278 | |
f4bda984 | 279 | /* Get here if we have already started filling out the BFD |
e60b52c6 | 280 | and there is an error of some kind. */ |
f4bda984 | 281 | |
252b5132 | 282 | error_return: |
9e7b37b3 AM |
283 | bfd_release (abfd, abfd->tdata.any); |
284 | abfd->tdata.any = NULL; | |
285 | bfd_section_list_clear (abfd); | |
286 | return NULL; | |
252b5132 RH |
287 | } |
288 | ||
40b35c78 | 289 | static bfd_cleanup |
2c3fc389 | 290 | cisco_core_file_p (bfd *abfd) |
f4bda984 RH |
291 | { |
292 | int *crash_info_locp; | |
40b35c78 | 293 | bfd_cleanup cleanup = NULL; |
f4bda984 RH |
294 | |
295 | for (crash_info_locp = crash_info_locs; | |
40b35c78 | 296 | *crash_info_locp != -1 && cleanup == NULL; |
f4bda984 RH |
297 | crash_info_locp++) |
298 | { | |
40b35c78 | 299 | cleanup = cisco_core_file_validate (abfd, *crash_info_locp); |
f4bda984 | 300 | } |
40b35c78 | 301 | return cleanup; |
f4bda984 RH |
302 | } |
303 | ||
d86492f2 | 304 | static char * |
2c3fc389 | 305 | cisco_core_file_failing_command (bfd *abfd ATTRIBUTE_UNUSED) |
252b5132 RH |
306 | { |
307 | return NULL; | |
308 | } | |
309 | ||
d86492f2 | 310 | static int |
2c3fc389 | 311 | cisco_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED) |
252b5132 RH |
312 | { |
313 | return abfd->tdata.cisco_core_data->sig; | |
314 | } | |
252b5132 | 315 | \f |
6d00b590 | 316 | extern const bfd_target core_cisco_le_vec; |
f4bda984 | 317 | |
6d00b590 | 318 | const bfd_target core_cisco_be_vec = |
2c3fc389 | 319 | { |
d00dd7dc AM |
320 | "cisco-ios-core-big", |
321 | bfd_target_unknown_flavour, | |
322 | BFD_ENDIAN_BIG, /* target byte order */ | |
323 | BFD_ENDIAN_BIG, /* target headers byte order */ | |
324 | (HAS_RELOC | EXEC_P /* object flags */ | |
325 | | HAS_LINENO | HAS_DEBUG | |
326 | | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), | |
327 | (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ | |
328 | 0, /* symbol prefix */ | |
329 | ' ', /* ar_pad_char */ | |
330 | 16, /* ar_max_namelen */ | |
331 | 0, /* match priority. */ | |
d1bcae83 | 332 | TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */ |
d00dd7dc AM |
333 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, |
334 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, | |
335 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */ | |
336 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, | |
337 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, | |
338 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ | |
339 | ||
340 | { /* bfd_check_format */ | |
341 | _bfd_dummy_target, /* unknown format */ | |
342 | _bfd_dummy_target, /* object file */ | |
343 | _bfd_dummy_target, /* archive */ | |
344 | cisco_core_file_p /* a core file */ | |
345 | }, | |
346 | { /* bfd_set_format */ | |
347 | _bfd_bool_bfd_false_error, | |
348 | _bfd_bool_bfd_false_error, | |
349 | _bfd_bool_bfd_false_error, | |
350 | _bfd_bool_bfd_false_error | |
351 | }, | |
352 | { /* bfd_write_contents */ | |
353 | _bfd_bool_bfd_false_error, | |
354 | _bfd_bool_bfd_false_error, | |
355 | _bfd_bool_bfd_false_error, | |
356 | _bfd_bool_bfd_false_error | |
357 | }, | |
358 | ||
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), | |
368 | ||
369 | &core_cisco_le_vec, | |
370 | ||
371 | NULL /* backend_data */ | |
f4bda984 RH |
372 | }; |
373 | ||
6d00b590 | 374 | const bfd_target core_cisco_le_vec = |
2c3fc389 | 375 | { |
d00dd7dc AM |
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 | 0, /* match_priority */ | |
d1bcae83 | 388 | TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */ |
d00dd7dc AM |
389 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, |
390 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, | |
391 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */ | |
392 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, | |
393 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, | |
394 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */ | |
395 | ||
396 | { /* bfd_check_format */ | |
397 | _bfd_dummy_target, /* unknown format */ | |
398 | _bfd_dummy_target, /* object file */ | |
399 | _bfd_dummy_target, /* archive */ | |
400 | cisco_core_file_p /* a core file */ | |
401 | }, | |
402 | { /* bfd_set_format */ | |
403 | _bfd_bool_bfd_false_error, | |
404 | _bfd_bool_bfd_false_error, | |
405 | _bfd_bool_bfd_false_error, | |
406 | _bfd_bool_bfd_false_error | |
407 | }, | |
408 | { /* bfd_write_contents */ | |
409 | _bfd_bool_bfd_false_error, | |
410 | _bfd_bool_bfd_false_error, | |
411 | _bfd_bool_bfd_false_error, | |
412 | _bfd_bool_bfd_false_error | |
413 | }, | |
414 | ||
415 | BFD_JUMP_TABLE_GENERIC (_bfd_generic), | |
416 | BFD_JUMP_TABLE_COPY (_bfd_generic), | |
417 | BFD_JUMP_TABLE_CORE (cisco), | |
418 | BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), | |
419 | BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), | |
420 | BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), | |
421 | BFD_JUMP_TABLE_WRITE (_bfd_generic), | |
422 | BFD_JUMP_TABLE_LINK (_bfd_nolink), | |
423 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), | |
424 | ||
425 | &core_cisco_be_vec, | |
426 | ||
427 | NULL /* backend_data */ | |
252b5132 | 428 | }; |