Commit | Line | Data |
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dd3b648e RP |
1 | /* Work with core dump and executable files, for GDB. |
2 | Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
99a7de40 | 6 | This program is free software; you can redistribute it and/or modify |
dd3b648e | 7 | it under the terms of the GNU General Public License as published by |
99a7de40 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
dd3b648e | 10 | |
99a7de40 | 11 | This program is distributed in the hope that it will be useful, |
dd3b648e RP |
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. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
99a7de40 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
dd3b648e RP |
19 | |
20 | #include <stdio.h> | |
21 | #include <errno.h> | |
22 | #include <signal.h> | |
23 | #include "defs.h" | |
24 | #include "param.h" | |
25 | #include "frame.h" /* required by inferior.h */ | |
26 | #include "inferior.h" | |
27 | #include "symtab.h" | |
28 | #include "command.h" | |
29 | #include "bfd.h" | |
30 | #include "target.h" | |
31 | #include "gdbcore.h" | |
32 | ||
33 | extern int xfer_memory (); | |
34 | extern void child_attach (), child_create_inferior (); | |
35 | ||
36 | extern int sys_nerr; | |
37 | extern char *sys_errlist[]; | |
38 | extern char *sys_siglist[]; | |
39 | ||
40 | extern char registers[]; | |
41 | ||
42 | /* Hook for `exec_file_command' command to call. */ | |
43 | ||
44 | void (*exec_file_display_hook) () = NULL; | |
45 | ||
dd3b648e RP |
46 | /* Binary file diddling handle for the core file. */ |
47 | ||
48 | bfd *core_bfd = NULL; | |
49 | ||
50 | /* Forward decl */ | |
51 | extern struct target_ops core_ops; | |
52 | ||
53 | \f | |
54 | /* Discard all vestiges of any previous core file | |
55 | and mark data and stack spaces as empty. */ | |
56 | ||
e1ce8aa5 | 57 | /* ARGSUSED */ |
dd3b648e RP |
58 | void |
59 | core_close (quitting) | |
60 | int quitting; | |
61 | { | |
62 | if (core_bfd) { | |
63 | free (bfd_get_filename (core_bfd)); | |
64 | bfd_close (core_bfd); | |
65 | core_bfd = NULL; | |
d0237a54 JK |
66 | #ifdef CLEAR_SOLIB |
67 | CLEAR_SOLIB (); | |
68 | #endif | |
c561ca5d JG |
69 | if (core_ops.sections) { |
70 | free (core_ops.sections); | |
71 | core_ops.sections = NULL; | |
72 | core_ops.sections_end = NULL; | |
73 | } | |
dd3b648e RP |
74 | } |
75 | } | |
76 | ||
5c9878f1 JG |
77 | #ifdef SOLIB_ADD |
78 | /* Stub function for catch_errors around shared library hacking. */ | |
79 | ||
80 | int | |
81 | solib_add_stub (from_tty) | |
82 | int from_tty; | |
83 | { | |
84 | SOLIB_ADD (NULL, from_tty, &core_ops); | |
85 | return 0; | |
86 | } | |
87 | #endif /* SOLIB_ADD */ | |
88 | ||
dd3b648e RP |
89 | /* This routine opens and sets up the core file bfd */ |
90 | ||
91 | void | |
92 | core_open (filename, from_tty) | |
93 | char *filename; | |
94 | int from_tty; | |
95 | { | |
c3a21801 | 96 | const char *p; |
dd3b648e RP |
97 | int siggy; |
98 | struct cleanup *old_chain; | |
99 | char *temp; | |
100 | bfd *temp_bfd; | |
101 | int ontop; | |
102 | ||
f2fc6e7a | 103 | target_preopen (from_tty); |
dd3b648e RP |
104 | if (!filename) |
105 | { | |
106 | error (core_bfd? | |
107 | "No core file specified. (Use `detach' to stop debugging a core file.)" | |
108 | : "No core file specified."); | |
109 | } | |
110 | ||
111 | filename = tilde_expand (filename); | |
112 | if (filename[0] != '/') { | |
113 | temp = concat (current_directory, "/", filename); | |
114 | free (filename); | |
115 | filename = temp; | |
116 | } | |
117 | ||
118 | old_chain = make_cleanup (free, filename); | |
119 | temp_bfd = bfd_openr (filename, NULL); | |
120 | if (temp_bfd == NULL) | |
121 | { | |
122 | perror_with_name (filename); | |
123 | } | |
124 | ||
125 | if (!bfd_check_format (temp_bfd, bfd_core)) | |
126 | { | |
127 | bfd_close (temp_bfd); | |
128 | error ("\"%s\" does not appear to be a core dump", filename); | |
129 | } | |
130 | ||
131 | /* Looks semi-reasonable. Toss the old core file and work on the new. */ | |
132 | ||
133 | discard_cleanups (old_chain); /* Don't free filename any more */ | |
134 | unpush_target (&core_ops); | |
135 | core_bfd = temp_bfd; | |
136 | old_chain = make_cleanup (core_close, core_bfd); | |
137 | ||
138 | validate_files (); | |
139 | ||
140 | /* Find the data section */ | |
c561ca5d JG |
141 | if (build_section_table (core_bfd, &core_ops.sections, |
142 | &core_ops.sections_end)) | |
dd3b648e RP |
143 | error ("Can't find sections in `%s': %s", bfd_get_filename(core_bfd), |
144 | bfd_errmsg (bfd_error)); | |
145 | ||
146 | ontop = !push_target (&core_ops); | |
c561ca5d | 147 | discard_cleanups (old_chain); |
dd3b648e RP |
148 | |
149 | p = bfd_core_file_failing_command (core_bfd); | |
150 | if (p) | |
151 | printf ("Core file invoked as `%s'.\n", p); | |
152 | ||
153 | siggy = bfd_core_file_failing_signal (core_bfd); | |
154 | if (siggy > 0) | |
155 | printf ("Program terminated with signal %d, %s.\n", siggy, | |
156 | siggy < NSIG ? sys_siglist[siggy] : "(undocumented)"); | |
157 | ||
158 | if (ontop) { | |
159 | /* Fetch all registers from core file */ | |
160 | target_fetch_registers (-1); | |
5c9878f1 | 161 | |
c561ca5d | 162 | /* Add symbols and section mappings for any shared libraries */ |
d0237a54 | 163 | #ifdef SOLIB_ADD |
5c9878f1 | 164 | (void) catch_errors (solib_add_stub, from_tty, (char *)0); |
d0237a54 | 165 | #endif |
5594d534 JG |
166 | /* Now, set up the frame cache, and print the top of stack */ |
167 | set_current_frame ( create_new_frame (read_register (FP_REGNUM), | |
168 | read_pc ())); | |
169 | select_frame (get_current_frame (), 0); | |
dd3b648e RP |
170 | print_sel_frame (0); /* Print the top frame and source line */ |
171 | } else { | |
172 | printf ( | |
173 | "Warning: you won't be able to access this core file until you terminate\n\ | |
174 | your %s; do ``info files''\n", current_target->to_longname); | |
175 | } | |
dd3b648e RP |
176 | } |
177 | ||
178 | void | |
179 | core_detach (args, from_tty) | |
180 | char *args; | |
181 | int from_tty; | |
182 | { | |
dd3b648e RP |
183 | if (args) |
184 | error ("Too many arguments"); | |
3f2e006b | 185 | unpush_target (&core_ops); |
dd3b648e RP |
186 | if (from_tty) |
187 | printf ("No core file now.\n"); | |
188 | } | |
189 | ||
190 | /* Backward compatability with old way of specifying core files. */ | |
191 | ||
192 | void | |
193 | core_file_command (filename, from_tty) | |
194 | char *filename; | |
195 | int from_tty; | |
196 | { | |
3f2e006b | 197 | dont_repeat (); /* Either way, seems bogus. */ |
dd3b648e RP |
198 | if (!filename) |
199 | core_detach (filename, from_tty); | |
200 | else | |
201 | core_open (filename, from_tty); | |
202 | } | |
203 | ||
204 | \f | |
205 | /* Call this to specify the hook for exec_file_command to call back. | |
206 | This is called from the x-window display code. */ | |
207 | ||
208 | void | |
209 | specify_exec_file_hook (hook) | |
210 | void (*hook) (); | |
211 | { | |
212 | exec_file_display_hook = hook; | |
213 | } | |
214 | ||
215 | /* The exec file must be closed before running an inferior. | |
216 | If it is needed again after the inferior dies, it must | |
217 | be reopened. */ | |
218 | ||
219 | void | |
220 | close_exec_file () | |
221 | { | |
222 | #ifdef FIXME | |
223 | if (exec_bfd) | |
224 | bfd_tempclose (exec_bfd); | |
225 | #endif | |
226 | } | |
227 | ||
228 | void | |
229 | reopen_exec_file () | |
230 | { | |
231 | #ifdef FIXME | |
232 | if (exec_bfd) | |
233 | bfd_reopen (exec_bfd); | |
234 | #endif | |
235 | } | |
236 | \f | |
237 | /* If we have both a core file and an exec file, | |
c561ca5d | 238 | print a warning if they don't go together. */ |
dd3b648e RP |
239 | |
240 | void | |
241 | validate_files () | |
242 | { | |
243 | if (exec_bfd && core_bfd) | |
244 | { | |
245 | if (core_file_matches_executable_p (core_bfd, exec_bfd)) | |
246 | printf ("Warning: core file does not match specified executable file.\n"); | |
247 | else if (bfd_get_mtime(exec_bfd) > bfd_get_mtime(core_bfd)) | |
248 | printf ("Warning: exec file is newer than core file.\n"); | |
249 | } | |
250 | } | |
251 | ||
252 | /* Return the name of the executable file as a string. | |
253 | ERR nonzero means get error if there is none specified; | |
254 | otherwise return 0 in that case. */ | |
255 | ||
256 | char * | |
257 | get_exec_file (err) | |
258 | int err; | |
259 | { | |
260 | if (exec_bfd) return bfd_get_filename(exec_bfd); | |
261 | if (!err) return NULL; | |
262 | ||
263 | error ("No executable file specified.\n\ | |
264 | Use the \"file\" or \"exec-file\" command."); | |
265 | return NULL; | |
266 | } | |
267 | ||
268 | static void | |
c561ca5d JG |
269 | core_files_info (t) |
270 | struct target_ops *t; | |
dd3b648e RP |
271 | { |
272 | struct section_table *p; | |
273 | ||
274 | printf ("\tCore file `%s'.\n", bfd_get_filename(core_bfd)); | |
275 | ||
c561ca5d JG |
276 | for (p = t->sections; p < t->sections_end; p++) |
277 | if (p->bfd == core_bfd) | |
278 | printf("\tcore file from 0x%08x to 0x%08x is %s\n", | |
279 | p->addr, p->endaddr, | |
280 | bfd_section_name (p->bfd, p->sec_ptr)); | |
281 | else { | |
282 | printf("\tshared lib from 0x%08x to 0x%08x is %s in %s\n", | |
283 | p->addr, p->endaddr, | |
284 | bfd_section_name (p->bfd, p->sec_ptr), | |
285 | bfd_get_filename (p->bfd)); | |
286 | } | |
dd3b648e RP |
287 | } |
288 | \f | |
289 | void | |
290 | memory_error (status, memaddr) | |
291 | int status; | |
292 | CORE_ADDR memaddr; | |
293 | { | |
294 | ||
295 | if (status == EIO) | |
296 | { | |
297 | /* Actually, address between memaddr and memaddr + len | |
298 | was out of bounds. */ | |
b8c50f09 | 299 | error ("Cannot access memory at address 0x%x.", memaddr); |
dd3b648e RP |
300 | } |
301 | else | |
302 | { | |
303 | if (status >= sys_nerr || status < 0) | |
304 | error ("Error accessing memory address 0x%x: unknown error (%d).", | |
305 | memaddr, status); | |
306 | else | |
307 | error ("Error accessing memory address 0x%x: %s.", | |
308 | memaddr, sys_errlist[status]); | |
309 | } | |
310 | } | |
311 | ||
312 | /* Same as target_read_memory, but report an error if can't read. */ | |
313 | void | |
314 | read_memory (memaddr, myaddr, len) | |
315 | CORE_ADDR memaddr; | |
316 | char *myaddr; | |
317 | int len; | |
318 | { | |
319 | int status; | |
320 | status = target_read_memory (memaddr, myaddr, len); | |
321 | if (status != 0) | |
322 | memory_error (status, memaddr); | |
323 | } | |
324 | ||
325 | /* Same as target_write_memory, but report an error if can't write. */ | |
326 | void | |
327 | write_memory (memaddr, myaddr, len) | |
328 | CORE_ADDR memaddr; | |
329 | char *myaddr; | |
330 | int len; | |
331 | { | |
332 | int status; | |
333 | ||
334 | status = target_write_memory (memaddr, myaddr, len); | |
335 | if (status != 0) | |
336 | memory_error (status, memaddr); | |
337 | } | |
338 | ||
339 | /* Read an integer from debugged memory, given address and number of bytes. */ | |
340 | ||
341 | long | |
342 | read_memory_integer (memaddr, len) | |
343 | CORE_ADDR memaddr; | |
344 | int len; | |
345 | { | |
346 | char cbuf; | |
347 | short sbuf; | |
348 | int ibuf; | |
349 | long lbuf; | |
350 | ||
351 | if (len == sizeof (char)) | |
352 | { | |
353 | read_memory (memaddr, &cbuf, len); | |
354 | return cbuf; | |
355 | } | |
356 | if (len == sizeof (short)) | |
357 | { | |
358 | read_memory (memaddr, (char *)&sbuf, len); | |
359 | SWAP_TARGET_AND_HOST (&sbuf, sizeof (short)); | |
360 | return sbuf; | |
361 | } | |
362 | if (len == sizeof (int)) | |
363 | { | |
364 | read_memory (memaddr, (char *)&ibuf, len); | |
365 | SWAP_TARGET_AND_HOST (&ibuf, sizeof (int)); | |
366 | return ibuf; | |
367 | } | |
368 | if (len == sizeof (lbuf)) | |
369 | { | |
370 | read_memory (memaddr, (char *)&lbuf, len); | |
371 | SWAP_TARGET_AND_HOST (&lbuf, sizeof (lbuf)); | |
372 | return lbuf; | |
373 | } | |
374 | error ("Cannot handle integers of %d bytes.", len); | |
375 | return -1; /* for lint */ | |
376 | } | |
377 | \f | |
dd3b648e RP |
378 | /* Get the registers out of a core file. This is the machine- |
379 | independent part. Fetch_core_registers is the machine-dependent | |
380 | part, typically implemented in the xm-file for each architecture. */ | |
381 | ||
e1ce8aa5 JK |
382 | /* We just get all the registers, so we don't use regno. */ |
383 | /* ARGSUSED */ | |
5594d534 | 384 | static void |
dd3b648e RP |
385 | get_core_registers (regno) |
386 | int regno; | |
387 | { | |
388 | sec_ptr reg_sec; | |
389 | unsigned size; | |
390 | char *the_regs; | |
391 | ||
392 | reg_sec = bfd_get_section_by_name (core_bfd, ".reg"); | |
393 | size = bfd_section_size (core_bfd, reg_sec); | |
394 | the_regs = alloca (size); | |
395 | if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, | |
396 | (unsigned)0, size)) | |
397 | { | |
398 | fetch_core_registers (the_regs, size, 0); | |
399 | } | |
400 | else | |
401 | { | |
402 | fprintf (stderr, "Couldn't fetch registers from core file: %s\n", | |
403 | bfd_errmsg (bfd_error)); | |
404 | } | |
405 | ||
406 | /* Now do it again for the float registers, if they exist. */ | |
407 | reg_sec = bfd_get_section_by_name (core_bfd, ".reg2"); | |
408 | if (reg_sec) { | |
409 | size = bfd_section_size (core_bfd, reg_sec); | |
410 | the_regs = alloca (size); | |
411 | if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, | |
412 | (unsigned)0, size)) | |
413 | { | |
414 | fetch_core_registers (the_regs, size, 2); | |
415 | } | |
416 | else | |
417 | { | |
418 | fprintf (stderr, "Couldn't fetch register set 2 from core file: %s\n", | |
419 | bfd_errmsg (bfd_error)); | |
420 | } | |
421 | } | |
422 | registers_fetched(); | |
dd3b648e RP |
423 | } |
424 | \f | |
425 | struct target_ops core_ops = { | |
426 | "core", "Local core dump file", | |
f2fc6e7a | 427 | "Use a core file as a target. Specify the filename of the core file.", |
dd3b648e RP |
428 | core_open, core_close, |
429 | child_attach, core_detach, 0, 0, /* resume, wait */ | |
430 | get_core_registers, | |
431 | 0, 0, 0, 0, /* store_regs, prepare_to_store, conv_to, conv_from */ | |
c561ca5d | 432 | xfer_memory, core_files_info, |
dd3b648e RP |
433 | 0, 0, /* core_insert_breakpoint, core_remove_breakpoint, */ |
434 | 0, 0, 0, 0, 0, /* terminal stuff */ | |
c561ca5d | 435 | 0, 0, 0, 0, /* kill, load, call fn, lookup sym */ |
dd3b648e RP |
436 | child_create_inferior, 0, /* mourn_inferior */ |
437 | core_stratum, 0, /* next */ | |
438 | 0, 1, 1, 1, 0, /* all mem, mem, stack, regs, exec */ | |
c561ca5d | 439 | 0, 0, /* section pointers */ |
dd3b648e RP |
440 | OPS_MAGIC, /* Always the last thing */ |
441 | }; | |
442 | ||
443 | void | |
444 | _initialize_core() | |
445 | { | |
446 | ||
447 | add_com ("core-file", class_files, core_file_command, | |
448 | "Use FILE as core dump for examining memory and registers.\n\ | |
449 | No arg means have no core file. This command has been superseded by the\n\ | |
450 | `target core' and `detach' commands."); | |
451 | add_target (&core_ops); | |
452 | } |