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252b5132 RH |
1 | /* BFD back-end for CISCO crash dumps. |
2 | ||
3 | Copyright 1994 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "bfd.h" | |
22 | #include "sysdep.h" | |
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 | |
39 | #define CRASH_INFO (0xffc) | |
40 | #define CRASH_MAGIC 0xdead1234 | |
41 | ||
42 | typedef enum { | |
43 | CRASH_REASON_NOTCRASHED = 0, | |
44 | CRASH_REASON_EXCEPTION = 1, | |
45 | CRASH_REASON_CORRUPT = 2, | |
46 | } crashreason; | |
47 | ||
48 | struct crashinfo_external | |
49 | { | |
50 | char magic[4]; /* Magic number */ | |
51 | char version[4]; /* Version number */ | |
52 | char reason[4]; /* Crash reason */ | |
53 | char cpu_vector[4]; /* CPU vector for exceptions */ | |
54 | char registers[4]; /* Pointer to saved registers */ | |
55 | char rambase[4]; /* Base of RAM (not in V1 crash info) */ | |
56 | }; | |
57 | \f | |
58 | struct cisco_core_struct | |
59 | { | |
60 | int sig; | |
61 | }; | |
62 | \f | |
63 | static const bfd_target * | |
64 | cisco_core_file_p (abfd) | |
65 | bfd *abfd; | |
66 | { | |
67 | char buf[4]; | |
68 | unsigned int crashinfo_offset; | |
69 | struct crashinfo_external crashinfo; | |
70 | int nread; | |
71 | unsigned int rambase; | |
72 | sec_ptr asect; | |
73 | struct stat statbuf; | |
74 | ||
75 | if (bfd_seek (abfd, CRASH_INFO, SEEK_SET) != 0) | |
76 | return NULL; | |
77 | ||
78 | nread = bfd_read (buf, 1, 4, abfd); | |
79 | if (nread != 4) | |
80 | { | |
81 | if (bfd_get_error () != bfd_error_system_call) | |
82 | bfd_set_error (bfd_error_wrong_format); | |
83 | return NULL; | |
84 | } | |
85 | crashinfo_offset = bfd_get_32 (abfd, buf); | |
86 | ||
87 | if (bfd_seek (abfd, crashinfo_offset, SEEK_SET) != 0) | |
88 | return NULL; | |
89 | ||
90 | nread = bfd_read (&crashinfo, 1, sizeof (crashinfo), abfd); | |
91 | if (nread != sizeof (crashinfo)) | |
92 | { | |
93 | if (bfd_get_error () != bfd_error_system_call) | |
94 | bfd_set_error (bfd_error_wrong_format); | |
95 | return NULL; | |
96 | } | |
97 | ||
98 | if (bfd_stat (abfd, &statbuf) < 0) | |
99 | { | |
100 | bfd_set_error (bfd_error_system_call); | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | if (bfd_get_32 (abfd, crashinfo.magic) != CRASH_MAGIC) | |
105 | { | |
106 | bfd_set_error (bfd_error_wrong_format); | |
107 | return NULL; | |
108 | } | |
109 | ||
110 | switch (bfd_get_32 (abfd, crashinfo.version)) | |
111 | { | |
112 | case 0: | |
113 | bfd_set_error (bfd_error_wrong_format); | |
114 | return NULL; | |
115 | case 1: | |
116 | rambase = 0; | |
117 | break; | |
118 | default: | |
119 | case 2: | |
120 | rambase = bfd_get_32 (abfd, crashinfo.rambase); | |
121 | break; | |
122 | } | |
123 | ||
124 | /* OK, we believe you. You're a core file. */ | |
125 | ||
126 | abfd->tdata.cisco_core_data = | |
127 | ((struct cisco_core_struct *) | |
128 | bfd_zmalloc (sizeof (struct cisco_core_struct))); | |
129 | if (abfd->tdata.cisco_core_data == NULL) | |
130 | return NULL; | |
131 | ||
132 | switch ((crashreason) bfd_get_32 (abfd, crashinfo.reason)) | |
133 | { | |
134 | case CRASH_REASON_NOTCRASHED: | |
135 | /* Crash file probably came from write core. */ | |
136 | abfd->tdata.cisco_core_data->sig = 0; | |
137 | break; | |
138 | case CRASH_REASON_CORRUPT: | |
139 | /* The crash context area was corrupt -- proceed with caution. | |
140 | We have no way of passing this information back to the caller. */ | |
141 | abfd->tdata.cisco_core_data->sig = 0; | |
142 | break; | |
143 | case CRASH_REASON_EXCEPTION: | |
144 | /* Crash occured due to CPU exception. */ | |
145 | ||
146 | /* This is 68k-specific; for MIPS we'll need to interpret | |
147 | cpu_vector differently based on the target configuration | |
148 | (since CISCO core files don't seem to have the processor | |
149 | encoded in them). */ | |
150 | ||
151 | switch (bfd_get_32 (abfd, crashinfo.cpu_vector)) | |
152 | { | |
153 | /* bus error */ | |
154 | case 2 : abfd->tdata.cisco_core_data->sig = SIGBUS; break; | |
155 | /* address error */ | |
156 | case 3 : abfd->tdata.cisco_core_data->sig = SIGBUS; break; | |
157 | /* illegal instruction */ | |
158 | case 4 : abfd->tdata.cisco_core_data->sig = SIGILL; break; | |
159 | /* zero divide */ | |
160 | case 5 : abfd->tdata.cisco_core_data->sig = SIGFPE; break; | |
161 | /* chk instruction */ | |
162 | case 6 : abfd->tdata.cisco_core_data->sig = SIGFPE; break; | |
163 | /* trapv instruction */ | |
164 | case 7 : abfd->tdata.cisco_core_data->sig = SIGFPE; break; | |
165 | /* privilege violation */ | |
166 | case 8 : abfd->tdata.cisco_core_data->sig = SIGSEGV; break; | |
167 | /* trace trap */ | |
168 | case 9 : abfd->tdata.cisco_core_data->sig = SIGTRAP; break; | |
169 | /* line 1010 emulator */ | |
170 | case 10: abfd->tdata.cisco_core_data->sig = SIGILL; break; | |
171 | /* line 1111 emulator */ | |
172 | case 11: abfd->tdata.cisco_core_data->sig = SIGILL; break; | |
173 | ||
174 | /* Coprocessor protocol violation. Using a standard MMU or FPU | |
175 | this cannot be triggered by software. Call it a SIGBUS. */ | |
176 | case 13: abfd->tdata.cisco_core_data->sig = SIGBUS; break; | |
177 | ||
178 | /* interrupt */ | |
179 | case 31: abfd->tdata.cisco_core_data->sig = SIGINT; break; | |
180 | /* breakpoint */ | |
181 | case 33: abfd->tdata.cisco_core_data->sig = SIGTRAP; break; | |
182 | ||
183 | /* floating point err */ | |
184 | case 48: abfd->tdata.cisco_core_data->sig = SIGFPE; break; | |
185 | /* floating point err */ | |
186 | case 49: abfd->tdata.cisco_core_data->sig = SIGFPE; break; | |
187 | /* zero divide */ | |
188 | case 50: abfd->tdata.cisco_core_data->sig = SIGFPE; break; | |
189 | /* underflow */ | |
190 | case 51: abfd->tdata.cisco_core_data->sig = SIGFPE; break; | |
191 | /* operand error */ | |
192 | case 52: abfd->tdata.cisco_core_data->sig = SIGFPE; break; | |
193 | /* overflow */ | |
194 | case 53: abfd->tdata.cisco_core_data->sig = SIGFPE; break; | |
195 | /* NAN */ | |
196 | case 54: abfd->tdata.cisco_core_data->sig = SIGFPE; break; | |
197 | default: | |
198 | #ifndef SIGEMT | |
199 | #define SIGEMT SIGTRAP | |
200 | #endif | |
201 | /* "software generated"*/ | |
202 | abfd->tdata.cisco_core_data->sig = SIGEMT; | |
203 | } | |
204 | break; | |
205 | default: | |
206 | /* Unknown crash reason. */ | |
207 | abfd->tdata.cisco_core_data->sig = 0; | |
208 | break; | |
209 | } | |
210 | ||
211 | abfd->sections = NULL; | |
212 | abfd->section_count = 0; | |
213 | ||
214 | asect = (asection *) bfd_zmalloc (sizeof (asection)); | |
215 | if (asect == NULL) | |
216 | goto error_return; | |
217 | asect->name = ".reg"; | |
218 | asect->flags = SEC_HAS_CONTENTS; | |
219 | /* This can be bigger than the real size. Set it to the size of the whole | |
220 | core file. */ | |
221 | asect->_raw_size = statbuf.st_size; | |
222 | asect->vma = 0; | |
223 | asect->filepos = bfd_get_32 (abfd, crashinfo.registers) - rambase; | |
224 | asect->next = abfd->sections; | |
225 | abfd->sections = asect; | |
226 | ++abfd->section_count; | |
227 | ||
228 | /* There is only one section containing data from the target system's RAM. | |
229 | We call it .data. */ | |
230 | asect = (asection *) bfd_zmalloc (sizeof (asection)); | |
231 | if (asect == NULL) | |
232 | goto error_return; | |
233 | asect->name = ".data"; | |
234 | asect->flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS; | |
235 | /* The size of memory is the size of the core file itself. */ | |
236 | asect->_raw_size = statbuf.st_size; | |
237 | asect->vma = rambase; | |
238 | asect->filepos = 0; | |
239 | asect->next = abfd->sections; | |
240 | abfd->sections = asect; | |
241 | ++abfd->section_count; | |
242 | ||
243 | return abfd->xvec; | |
244 | ||
245 | error_return: | |
246 | { | |
247 | sec_ptr nextsect; | |
248 | for (asect = abfd->sections; asect != NULL;) | |
249 | { | |
250 | nextsect = asect->next; | |
251 | free (asect); | |
252 | asect = nextsect; | |
253 | } | |
254 | free (abfd->tdata.cisco_core_data); | |
255 | return NULL; | |
256 | } | |
257 | } | |
258 | ||
259 | char * | |
260 | cisco_core_file_failing_command (abfd) | |
261 | bfd *abfd; | |
262 | { | |
263 | return NULL; | |
264 | } | |
265 | ||
266 | int | |
267 | cisco_core_file_failing_signal (abfd) | |
268 | bfd *abfd; | |
269 | { | |
270 | return abfd->tdata.cisco_core_data->sig; | |
271 | } | |
272 | ||
273 | boolean | |
274 | cisco_core_file_matches_executable_p (core_bfd, exec_bfd) | |
275 | bfd *core_bfd; | |
276 | bfd *exec_bfd; | |
277 | { | |
278 | return true; | |
279 | } | |
280 | \f | |
281 | const bfd_target cisco_core_vec = | |
282 | { | |
283 | "trad-core", | |
284 | bfd_target_unknown_flavour, | |
285 | BFD_ENDIAN_BIG, /* target byte order */ | |
286 | BFD_ENDIAN_BIG, /* target headers byte order */ | |
287 | (HAS_RELOC | EXEC_P | /* object flags */ | |
288 | HAS_LINENO | HAS_DEBUG | | |
289 | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), | |
290 | (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ | |
291 | 0, /* symbol prefix */ | |
292 | ' ', /* ar_pad_char */ | |
293 | 16, /* ar_max_namelen */ | |
294 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, | |
295 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, | |
296 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */ | |
297 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, | |
298 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, | |
299 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ | |
300 | ||
301 | { /* bfd_check_format */ | |
302 | _bfd_dummy_target, /* unknown format */ | |
303 | _bfd_dummy_target, /* object file */ | |
304 | _bfd_dummy_target, /* archive */ | |
305 | cisco_core_file_p /* a core file */ | |
306 | }, | |
307 | { /* bfd_set_format */ | |
308 | bfd_false, bfd_false, | |
309 | bfd_false, bfd_false | |
310 | }, | |
311 | { /* bfd_write_contents */ | |
312 | bfd_false, bfd_false, | |
313 | bfd_false, bfd_false | |
314 | }, | |
315 | ||
316 | BFD_JUMP_TABLE_GENERIC (_bfd_generic), | |
317 | BFD_JUMP_TABLE_COPY (_bfd_generic), | |
318 | BFD_JUMP_TABLE_CORE (cisco), | |
319 | BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), | |
320 | BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), | |
321 | BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), | |
322 | BFD_JUMP_TABLE_WRITE (_bfd_generic), | |
323 | BFD_JUMP_TABLE_LINK (_bfd_nolink), | |
324 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), | |
325 | ||
326 | (PTR) 0 /* backend_data */ | |
327 | }; |