Commit | Line | Data |
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dd3b648e | 1 | /* Work with core dump and executable files, for GDB. |
7ed0f002 | 2 | Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc. |
dd3b648e RP |
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 | 19 | |
d747e0af | 20 | #include "defs.h" |
dd3b648e RP |
21 | #include <errno.h> |
22 | #include <signal.h> | |
bdbd5f50 | 23 | #include <fcntl.h> |
dd3b648e RP |
24 | #include "frame.h" /* required by inferior.h */ |
25 | #include "inferior.h" | |
26 | #include "symtab.h" | |
27 | #include "command.h" | |
28 | #include "bfd.h" | |
29 | #include "target.h" | |
30 | #include "gdbcore.h" | |
31 | ||
7ed0f002 JG |
32 | #ifdef SOLIB_ADD |
33 | static int | |
34 | solib_add_stub PARAMS ((char *)); | |
35 | #endif | |
36 | ||
37 | static void | |
38 | core_close PARAMS ((int)); | |
39 | ||
40 | static void | |
41 | core_open PARAMS ((char *, int)); | |
42 | ||
43 | static void | |
44 | core_detach PARAMS ((char *, int)); | |
45 | ||
46 | static void | |
47 | get_core_registers PARAMS ((int)); | |
48 | ||
49 | static void | |
50 | core_files_info PARAMS ((struct target_ops *)); | |
dd3b648e RP |
51 | |
52 | extern int sys_nerr; | |
53 | extern char *sys_errlist[]; | |
54 | extern char *sys_siglist[]; | |
55 | ||
56 | extern char registers[]; | |
57 | ||
58 | /* Hook for `exec_file_command' command to call. */ | |
59 | ||
7ed0f002 | 60 | void (*exec_file_display_hook) PARAMS ((char *)) = NULL; |
dd3b648e | 61 | |
dd3b648e RP |
62 | /* Binary file diddling handle for the core file. */ |
63 | ||
64 | bfd *core_bfd = NULL; | |
65 | ||
66 | /* Forward decl */ | |
67 | extern struct target_ops core_ops; | |
68 | ||
69 | \f | |
70 | /* Discard all vestiges of any previous core file | |
71 | and mark data and stack spaces as empty. */ | |
72 | ||
e1ce8aa5 | 73 | /* ARGSUSED */ |
7ed0f002 | 74 | static void |
dd3b648e RP |
75 | core_close (quitting) |
76 | int quitting; | |
77 | { | |
78 | if (core_bfd) { | |
79 | free (bfd_get_filename (core_bfd)); | |
80 | bfd_close (core_bfd); | |
81 | core_bfd = NULL; | |
d0237a54 JK |
82 | #ifdef CLEAR_SOLIB |
83 | CLEAR_SOLIB (); | |
84 | #endif | |
7ed0f002 JG |
85 | if (core_ops.to_sections) { |
86 | free (core_ops.to_sections); | |
87 | core_ops.to_sections = NULL; | |
88 | core_ops.to_sections_end = NULL; | |
c561ca5d | 89 | } |
dd3b648e RP |
90 | } |
91 | } | |
92 | ||
5c9878f1 JG |
93 | #ifdef SOLIB_ADD |
94 | /* Stub function for catch_errors around shared library hacking. */ | |
95 | ||
7ed0f002 | 96 | static int |
5c9878f1 | 97 | solib_add_stub (from_tty) |
bdbd5f50 | 98 | char *from_tty; |
5c9878f1 | 99 | { |
bdbd5f50 | 100 | SOLIB_ADD (NULL, (int)from_tty, &core_ops); |
5c9878f1 JG |
101 | return 0; |
102 | } | |
103 | #endif /* SOLIB_ADD */ | |
104 | ||
dd3b648e RP |
105 | /* This routine opens and sets up the core file bfd */ |
106 | ||
7ed0f002 | 107 | static void |
dd3b648e RP |
108 | core_open (filename, from_tty) |
109 | char *filename; | |
110 | int from_tty; | |
111 | { | |
c3a21801 | 112 | const char *p; |
dd3b648e RP |
113 | int siggy; |
114 | struct cleanup *old_chain; | |
115 | char *temp; | |
116 | bfd *temp_bfd; | |
117 | int ontop; | |
bdbd5f50 | 118 | int scratch_chan; |
dd3b648e | 119 | |
f2fc6e7a | 120 | target_preopen (from_tty); |
dd3b648e RP |
121 | if (!filename) |
122 | { | |
123 | error (core_bfd? | |
124 | "No core file specified. (Use `detach' to stop debugging a core file.)" | |
125 | : "No core file specified."); | |
126 | } | |
127 | ||
128 | filename = tilde_expand (filename); | |
129 | if (filename[0] != '/') { | |
58ae87f6 | 130 | temp = concat (current_directory, "/", filename, NULL); |
dd3b648e RP |
131 | free (filename); |
132 | filename = temp; | |
133 | } | |
134 | ||
135 | old_chain = make_cleanup (free, filename); | |
bdbd5f50 JG |
136 | |
137 | scratch_chan = open (filename, write_files? O_RDWR: O_RDONLY, 0); | |
138 | if (scratch_chan < 0) | |
139 | perror_with_name (filename); | |
140 | ||
141 | temp_bfd = bfd_fdopenr (filename, NULL, scratch_chan); | |
dd3b648e RP |
142 | if (temp_bfd == NULL) |
143 | { | |
144 | perror_with_name (filename); | |
145 | } | |
146 | ||
147 | if (!bfd_check_format (temp_bfd, bfd_core)) | |
148 | { | |
7ed0f002 JG |
149 | /* Do it after the err msg */ |
150 | make_cleanup (bfd_close, temp_bfd); | |
45e60270 | 151 | error ("\"%s\" is not a core dump: %s", filename, bfd_errmsg(bfd_error)); |
dd3b648e RP |
152 | } |
153 | ||
154 | /* Looks semi-reasonable. Toss the old core file and work on the new. */ | |
155 | ||
156 | discard_cleanups (old_chain); /* Don't free filename any more */ | |
157 | unpush_target (&core_ops); | |
158 | core_bfd = temp_bfd; | |
159 | old_chain = make_cleanup (core_close, core_bfd); | |
160 | ||
161 | validate_files (); | |
162 | ||
163 | /* Find the data section */ | |
7ed0f002 JG |
164 | if (build_section_table (core_bfd, &core_ops.to_sections, |
165 | &core_ops.to_sections_end)) | |
dd3b648e RP |
166 | error ("Can't find sections in `%s': %s", bfd_get_filename(core_bfd), |
167 | bfd_errmsg (bfd_error)); | |
168 | ||
169 | ontop = !push_target (&core_ops); | |
c561ca5d | 170 | discard_cleanups (old_chain); |
dd3b648e RP |
171 | |
172 | p = bfd_core_file_failing_command (core_bfd); | |
173 | if (p) | |
fb182850 | 174 | printf ("Core was generated by `%s'.\n", p); |
dd3b648e RP |
175 | |
176 | siggy = bfd_core_file_failing_signal (core_bfd); | |
177 | if (siggy > 0) | |
178 | printf ("Program terminated with signal %d, %s.\n", siggy, | |
179 | siggy < NSIG ? sys_siglist[siggy] : "(undocumented)"); | |
180 | ||
181 | if (ontop) { | |
182 | /* Fetch all registers from core file */ | |
183 | target_fetch_registers (-1); | |
5c9878f1 | 184 | |
c561ca5d | 185 | /* Add symbols and section mappings for any shared libraries */ |
d0237a54 | 186 | #ifdef SOLIB_ADD |
bdbd5f50 | 187 | (void) catch_errors (solib_add_stub, (char *)from_tty, (char *)0); |
d0237a54 | 188 | #endif |
cadbb07a | 189 | |
5594d534 | 190 | /* Now, set up the frame cache, and print the top of stack */ |
cadbb07a JG |
191 | set_current_frame (create_new_frame (read_register (FP_REGNUM), |
192 | read_pc ())); | |
5594d534 | 193 | select_frame (get_current_frame (), 0); |
cadbb07a | 194 | print_stack_frame (selected_frame, selected_frame_level, 1); |
dd3b648e RP |
195 | } else { |
196 | printf ( | |
197 | "Warning: you won't be able to access this core file until you terminate\n\ | |
198 | your %s; do ``info files''\n", current_target->to_longname); | |
199 | } | |
dd3b648e RP |
200 | } |
201 | ||
7ed0f002 | 202 | static void |
dd3b648e RP |
203 | core_detach (args, from_tty) |
204 | char *args; | |
205 | int from_tty; | |
206 | { | |
dd3b648e RP |
207 | if (args) |
208 | error ("Too many arguments"); | |
3f2e006b | 209 | unpush_target (&core_ops); |
dd3b648e RP |
210 | if (from_tty) |
211 | printf ("No core file now.\n"); | |
212 | } | |
213 | ||
214 | /* Backward compatability with old way of specifying core files. */ | |
215 | ||
216 | void | |
217 | core_file_command (filename, from_tty) | |
218 | char *filename; | |
219 | int from_tty; | |
220 | { | |
3f2e006b | 221 | dont_repeat (); /* Either way, seems bogus. */ |
dd3b648e RP |
222 | if (!filename) |
223 | core_detach (filename, from_tty); | |
224 | else | |
225 | core_open (filename, from_tty); | |
226 | } | |
227 | ||
228 | \f | |
229 | /* Call this to specify the hook for exec_file_command to call back. | |
230 | This is called from the x-window display code. */ | |
231 | ||
232 | void | |
233 | specify_exec_file_hook (hook) | |
7ed0f002 | 234 | void (*hook) PARAMS ((char *)); |
dd3b648e RP |
235 | { |
236 | exec_file_display_hook = hook; | |
237 | } | |
238 | ||
239 | /* The exec file must be closed before running an inferior. | |
240 | If it is needed again after the inferior dies, it must | |
241 | be reopened. */ | |
242 | ||
243 | void | |
244 | close_exec_file () | |
245 | { | |
246 | #ifdef FIXME | |
247 | if (exec_bfd) | |
248 | bfd_tempclose (exec_bfd); | |
249 | #endif | |
250 | } | |
251 | ||
252 | void | |
253 | reopen_exec_file () | |
254 | { | |
255 | #ifdef FIXME | |
256 | if (exec_bfd) | |
257 | bfd_reopen (exec_bfd); | |
258 | #endif | |
259 | } | |
260 | \f | |
261 | /* If we have both a core file and an exec file, | |
c561ca5d | 262 | print a warning if they don't go together. */ |
dd3b648e RP |
263 | |
264 | void | |
265 | validate_files () | |
266 | { | |
267 | if (exec_bfd && core_bfd) | |
268 | { | |
bdbd5f50 JG |
269 | if (!core_file_matches_executable_p (core_bfd, exec_bfd)) |
270 | printf ("Warning: core file may not match specified executable file.\n"); | |
dd3b648e RP |
271 | else if (bfd_get_mtime(exec_bfd) > bfd_get_mtime(core_bfd)) |
272 | printf ("Warning: exec file is newer than core file.\n"); | |
273 | } | |
274 | } | |
275 | ||
276 | /* Return the name of the executable file as a string. | |
277 | ERR nonzero means get error if there is none specified; | |
278 | otherwise return 0 in that case. */ | |
279 | ||
280 | char * | |
281 | get_exec_file (err) | |
282 | int err; | |
283 | { | |
284 | if (exec_bfd) return bfd_get_filename(exec_bfd); | |
285 | if (!err) return NULL; | |
286 | ||
287 | error ("No executable file specified.\n\ | |
288 | Use the \"file\" or \"exec-file\" command."); | |
289 | return NULL; | |
290 | } | |
291 | ||
292 | static void | |
c561ca5d JG |
293 | core_files_info (t) |
294 | struct target_ops *t; | |
dd3b648e | 295 | { |
8c378559 | 296 | print_section_info (t, core_bfd); |
dd3b648e RP |
297 | } |
298 | \f | |
7ed0f002 JG |
299 | /* Report a memory error with error(). */ |
300 | ||
dd3b648e RP |
301 | void |
302 | memory_error (status, memaddr) | |
303 | int status; | |
304 | CORE_ADDR memaddr; | |
305 | { | |
306 | ||
307 | if (status == EIO) | |
308 | { | |
309 | /* Actually, address between memaddr and memaddr + len | |
310 | was out of bounds. */ | |
ec99961f | 311 | error ("Cannot access memory at address %s.", local_hex_string(memaddr)); |
dd3b648e RP |
312 | } |
313 | else | |
314 | { | |
315 | if (status >= sys_nerr || status < 0) | |
ec99961f JG |
316 | error ("Error accessing memory address %s: unknown error (%d).", |
317 | local_hex_string(memaddr), status); | |
dd3b648e | 318 | else |
ec99961f JG |
319 | error ("Error accessing memory address %s: %s.", |
320 | local_hex_string(memaddr), sys_errlist[status]); | |
dd3b648e RP |
321 | } |
322 | } | |
323 | ||
324 | /* Same as target_read_memory, but report an error if can't read. */ | |
325 | void | |
326 | read_memory (memaddr, myaddr, len) | |
327 | CORE_ADDR memaddr; | |
328 | char *myaddr; | |
329 | int len; | |
330 | { | |
331 | int status; | |
332 | status = target_read_memory (memaddr, myaddr, len); | |
333 | if (status != 0) | |
334 | memory_error (status, memaddr); | |
335 | } | |
336 | ||
337 | /* Same as target_write_memory, but report an error if can't write. */ | |
338 | void | |
339 | write_memory (memaddr, myaddr, len) | |
340 | CORE_ADDR memaddr; | |
341 | char *myaddr; | |
342 | int len; | |
343 | { | |
344 | int status; | |
345 | ||
346 | status = target_write_memory (memaddr, myaddr, len); | |
347 | if (status != 0) | |
348 | memory_error (status, memaddr); | |
349 | } | |
350 | ||
351 | /* Read an integer from debugged memory, given address and number of bytes. */ | |
352 | ||
353 | long | |
354 | read_memory_integer (memaddr, len) | |
355 | CORE_ADDR memaddr; | |
356 | int len; | |
357 | { | |
358 | char cbuf; | |
359 | short sbuf; | |
360 | int ibuf; | |
361 | long lbuf; | |
362 | ||
363 | if (len == sizeof (char)) | |
364 | { | |
365 | read_memory (memaddr, &cbuf, len); | |
366 | return cbuf; | |
367 | } | |
368 | if (len == sizeof (short)) | |
369 | { | |
370 | read_memory (memaddr, (char *)&sbuf, len); | |
371 | SWAP_TARGET_AND_HOST (&sbuf, sizeof (short)); | |
372 | return sbuf; | |
373 | } | |
374 | if (len == sizeof (int)) | |
375 | { | |
376 | read_memory (memaddr, (char *)&ibuf, len); | |
377 | SWAP_TARGET_AND_HOST (&ibuf, sizeof (int)); | |
378 | return ibuf; | |
379 | } | |
380 | if (len == sizeof (lbuf)) | |
381 | { | |
382 | read_memory (memaddr, (char *)&lbuf, len); | |
383 | SWAP_TARGET_AND_HOST (&lbuf, sizeof (lbuf)); | |
384 | return lbuf; | |
385 | } | |
386 | error ("Cannot handle integers of %d bytes.", len); | |
387 | return -1; /* for lint */ | |
388 | } | |
389 | \f | |
dd3b648e RP |
390 | /* Get the registers out of a core file. This is the machine- |
391 | independent part. Fetch_core_registers is the machine-dependent | |
392 | part, typically implemented in the xm-file for each architecture. */ | |
393 | ||
e1ce8aa5 JK |
394 | /* We just get all the registers, so we don't use regno. */ |
395 | /* ARGSUSED */ | |
5594d534 | 396 | static void |
dd3b648e RP |
397 | get_core_registers (regno) |
398 | int regno; | |
399 | { | |
400 | sec_ptr reg_sec; | |
401 | unsigned size; | |
402 | char *the_regs; | |
403 | ||
404 | reg_sec = bfd_get_section_by_name (core_bfd, ".reg"); | |
07427425 | 405 | if (!reg_sec) goto cant; |
dd3b648e RP |
406 | size = bfd_section_size (core_bfd, reg_sec); |
407 | the_regs = alloca (size); | |
45e60270 | 408 | if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size)) |
dd3b648e | 409 | { |
45e60270 JG |
410 | fetch_core_registers (the_regs, size, 0, |
411 | (unsigned) bfd_section_vma (abfd,reg_sec)); | |
dd3b648e RP |
412 | } |
413 | else | |
414 | { | |
07427425 | 415 | cant: |
dd3b648e RP |
416 | fprintf (stderr, "Couldn't fetch registers from core file: %s\n", |
417 | bfd_errmsg (bfd_error)); | |
418 | } | |
419 | ||
420 | /* Now do it again for the float registers, if they exist. */ | |
421 | reg_sec = bfd_get_section_by_name (core_bfd, ".reg2"); | |
422 | if (reg_sec) { | |
423 | size = bfd_section_size (core_bfd, reg_sec); | |
424 | the_regs = alloca (size); | |
45e60270 JG |
425 | if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, |
426 | size)) | |
dd3b648e | 427 | { |
45e60270 JG |
428 | fetch_core_registers (the_regs, size, 2, |
429 | (unsigned) bfd_section_vma (abfd,reg_sec)); | |
dd3b648e RP |
430 | } |
431 | else | |
432 | { | |
433 | fprintf (stderr, "Couldn't fetch register set 2 from core file: %s\n", | |
434 | bfd_errmsg (bfd_error)); | |
435 | } | |
436 | } | |
437 | registers_fetched(); | |
dd3b648e RP |
438 | } |
439 | \f | |
440 | struct target_ops core_ops = { | |
441 | "core", "Local core dump file", | |
f2fc6e7a | 442 | "Use a core file as a target. Specify the filename of the core file.", |
dd3b648e RP |
443 | core_open, core_close, |
444 | child_attach, core_detach, 0, 0, /* resume, wait */ | |
445 | get_core_registers, | |
446 | 0, 0, 0, 0, /* store_regs, prepare_to_store, conv_to, conv_from */ | |
c561ca5d | 447 | xfer_memory, core_files_info, |
dd3b648e RP |
448 | 0, 0, /* core_insert_breakpoint, core_remove_breakpoint, */ |
449 | 0, 0, 0, 0, 0, /* terminal stuff */ | |
7ed0f002 | 450 | 0, 0, 0, /* kill, load, lookup sym */ |
dd3b648e RP |
451 | child_create_inferior, 0, /* mourn_inferior */ |
452 | core_stratum, 0, /* next */ | |
453 | 0, 1, 1, 1, 0, /* all mem, mem, stack, regs, exec */ | |
c561ca5d | 454 | 0, 0, /* section pointers */ |
dd3b648e RP |
455 | OPS_MAGIC, /* Always the last thing */ |
456 | }; | |
457 | ||
458 | void | |
459 | _initialize_core() | |
460 | { | |
461 | ||
462 | add_com ("core-file", class_files, core_file_command, | |
463 | "Use FILE as core dump for examining memory and registers.\n\ | |
464 | No arg means have no core file. This command has been superseded by the\n\ | |
465 | `target core' and `detach' commands."); | |
466 | add_target (&core_ops); | |
467 | } |