Commit | Line | Data |
---|---|---|
8afd6ca5 | 1 | /* Core dump and executable file functions below target vector, for GDB. |
ad3b8c4a | 2 | Copyright 1986, 87, 89, 91, 92, 93, 94, 95, 96, 97, 1998 |
ba47c66a | 3 | Free Software Foundation, Inc. |
8afd6ca5 RP |
4 | |
5 | This file is part of GDB. | |
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 | |
6c9638b4 | 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
8afd6ca5 RP |
20 | |
21 | #include "defs.h" | |
2b576293 | 22 | #include "gdb_string.h" |
8afd6ca5 RP |
23 | #include <errno.h> |
24 | #include <signal.h> | |
25 | #include <fcntl.h> | |
4ef1f467 | 26 | #include <unistd.h> |
8afd6ca5 RP |
27 | #include "frame.h" /* required by inferior.h */ |
28 | #include "inferior.h" | |
29 | #include "symtab.h" | |
30 | #include "command.h" | |
31 | #include "bfd.h" | |
32 | #include "target.h" | |
33 | #include "gdbcore.h" | |
fdfa3315 | 34 | #include "gdbthread.h" |
8afd6ca5 | 35 | |
a1df8e78 FF |
36 | /* List of all available core_fns. On gdb startup, each core file register |
37 | reader calls add_core_fns() to register information on each core format it | |
38 | is prepared to read. */ | |
39 | ||
40 | static struct core_fns *core_file_fns = NULL; | |
41 | ||
62a64dde | 42 | static void core_files_info PARAMS ((struct target_ops *)); |
8afd6ca5 RP |
43 | |
44 | #ifdef SOLIB_ADD | |
62a64dde | 45 | static int solib_add_stub PARAMS ((char *)); |
8afd6ca5 RP |
46 | #endif |
47 | ||
0d2d8412 SS |
48 | static void core_open PARAMS ((char *, int)); |
49 | ||
50 | static void core_detach PARAMS ((char *, int)); | |
51 | ||
62a64dde | 52 | static void core_close PARAMS ((int)); |
8afd6ca5 | 53 | |
62a64dde | 54 | static void get_core_registers PARAMS ((int)); |
8afd6ca5 | 55 | |
b607efe7 FF |
56 | static void add_to_thread_list PARAMS ((bfd *, asection *, PTR)); |
57 | ||
58 | static int ignore PARAMS ((CORE_ADDR, char *)); | |
59 | ||
4c49748e SS |
60 | static char *core_file_to_sym_file PARAMS ((char *)); |
61 | ||
62 | static int core_file_thread_alive PARAMS ((int tid)); | |
63 | ||
64 | static void init_core_ops PARAMS ((void)); | |
4ef1f467 | 65 | |
24418cfb JM |
66 | void _initialize_corelow PARAMS ((void)); |
67 | ||
4c49748e SS |
68 | struct target_ops core_ops; |
69 | ||
a1df8e78 FF |
70 | /* Link a new core_fns into the global core_file_fns list. Called on gdb |
71 | startup by the _initialize routine in each core file register reader, to | |
72 | register information about each format the the reader is prepared to | |
73 | handle. */ | |
74 | ||
75 | void | |
76 | add_core_fns (cf) | |
77 | struct core_fns *cf; | |
78 | { | |
79 | cf -> next = core_file_fns; | |
80 | core_file_fns = cf; | |
81 | } | |
82 | ||
83 | ||
62a64dde SS |
84 | /* Discard all vestiges of any previous core file and mark data and stack |
85 | spaces as empty. */ | |
8afd6ca5 RP |
86 | |
87 | /* ARGSUSED */ | |
88 | static void | |
89 | core_close (quitting) | |
90 | int quitting; | |
91 | { | |
9de0904c | 92 | char *name; |
62a64dde | 93 | |
62a64dde SS |
94 | if (core_bfd) |
95 | { | |
972256e7 PS |
96 | inferior_pid = 0; /* Avoid confusion from thread stuff */ |
97 | ||
62a64dde SS |
98 | name = bfd_get_filename (core_bfd); |
99 | if (!bfd_close (core_bfd)) | |
100 | warning ("cannot close \"%s\": %s", | |
101 | name, bfd_errmsg (bfd_get_error ())); | |
102 | free (name); | |
103 | core_bfd = NULL; | |
8afd6ca5 | 104 | #ifdef CLEAR_SOLIB |
62a64dde | 105 | CLEAR_SOLIB (); |
8afd6ca5 | 106 | #endif |
62a64dde SS |
107 | if (core_ops.to_sections) |
108 | { | |
109 | free ((PTR)core_ops.to_sections); | |
110 | core_ops.to_sections = NULL; | |
111 | core_ops.to_sections_end = NULL; | |
112 | } | |
8afd6ca5 | 113 | } |
8afd6ca5 RP |
114 | } |
115 | ||
116 | #ifdef SOLIB_ADD | |
842cf831 JK |
117 | /* Stub function for catch_errors around shared library hacking. FROM_TTYP |
118 | is really an int * which points to from_tty. */ | |
8afd6ca5 RP |
119 | |
120 | static int | |
842cf831 JK |
121 | solib_add_stub (from_ttyp) |
122 | char *from_ttyp; | |
8afd6ca5 | 123 | { |
9137a6f4 | 124 | SOLIB_ADD (NULL, *(int *)from_ttyp, ¤t_target); |
3c5124da | 125 | re_enable_breakpoints_in_shlibs (); |
26a859ec | 126 | return 0; |
8afd6ca5 RP |
127 | } |
128 | #endif /* SOLIB_ADD */ | |
129 | ||
d113e6b2 SG |
130 | /* Look for sections whose names start with `.reg/' so that we can extract the |
131 | list of threads in a core file. */ | |
132 | ||
133 | static void | |
7c5d526e | 134 | add_to_thread_list (abfd, asect, reg_sect_arg) |
d113e6b2 SG |
135 | bfd *abfd; |
136 | asection *asect; | |
7c5d526e | 137 | PTR reg_sect_arg; |
d113e6b2 SG |
138 | { |
139 | int thread_id; | |
4cc5b060 | 140 | asection *reg_sect = (asection *) reg_sect_arg; |
d113e6b2 SG |
141 | |
142 | if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0) | |
143 | return; | |
144 | ||
145 | thread_id = atoi (bfd_section_name (abfd, asect) + 5); | |
146 | ||
147 | add_thread (thread_id); | |
148 | ||
149 | /* Warning, Will Robinson, looking at BFD private data! */ | |
150 | ||
8eff3c7f SG |
151 | if (reg_sect != NULL |
152 | && asect->filepos == reg_sect->filepos) /* Did we find .reg? */ | |
d113e6b2 SG |
153 | inferior_pid = thread_id; /* Yes, make it current */ |
154 | } | |
155 | ||
62a64dde | 156 | /* This routine opens and sets up the core file bfd. */ |
8afd6ca5 | 157 | |
0d2d8412 | 158 | static void |
8afd6ca5 RP |
159 | core_open (filename, from_tty) |
160 | char *filename; | |
161 | int from_tty; | |
162 | { | |
163 | const char *p; | |
164 | int siggy; | |
165 | struct cleanup *old_chain; | |
166 | char *temp; | |
167 | bfd *temp_bfd; | |
168 | int ontop; | |
169 | int scratch_chan; | |
170 | ||
171 | target_preopen (from_tty); | |
172 | if (!filename) | |
173 | { | |
62a64dde | 174 | error (core_bfd ? |
8afd6ca5 RP |
175 | "No core file specified. (Use `detach' to stop debugging a core file.)" |
176 | : "No core file specified."); | |
177 | } | |
178 | ||
179 | filename = tilde_expand (filename); | |
62a64dde SS |
180 | if (filename[0] != '/') |
181 | { | |
182 | temp = concat (current_directory, "/", filename, NULL); | |
183 | free (filename); | |
184 | filename = temp; | |
185 | } | |
8afd6ca5 RP |
186 | |
187 | old_chain = make_cleanup (free, filename); | |
188 | ||
62a64dde | 189 | scratch_chan = open (filename, write_files ? O_RDWR : O_RDONLY, 0); |
8afd6ca5 RP |
190 | if (scratch_chan < 0) |
191 | perror_with_name (filename); | |
192 | ||
0685d95f | 193 | temp_bfd = bfd_fdopenr (filename, gnutarget, scratch_chan); |
8afd6ca5 | 194 | if (temp_bfd == NULL) |
62a64dde | 195 | perror_with_name (filename); |
8afd6ca5 RP |
196 | |
197 | if (!bfd_check_format (temp_bfd, bfd_core)) | |
198 | { | |
199 | /* Do it after the err msg */ | |
9de0904c JK |
200 | /* FIXME: should be checking for errors from bfd_close (for one thing, |
201 | on error it does not free all the storage associated with the | |
202 | bfd). */ | |
ad3b8c4a | 203 | make_cleanup ((make_cleanup_func) bfd_close, temp_bfd); |
62a64dde SS |
204 | error ("\"%s\" is not a core dump: %s", |
205 | filename, bfd_errmsg (bfd_get_error ())); | |
8afd6ca5 RP |
206 | } |
207 | ||
208 | /* Looks semi-reasonable. Toss the old core file and work on the new. */ | |
209 | ||
210 | discard_cleanups (old_chain); /* Don't free filename any more */ | |
211 | unpush_target (&core_ops); | |
212 | core_bfd = temp_bfd; | |
ad3b8c4a | 213 | old_chain = make_cleanup ((make_cleanup_func) core_close, core_bfd); |
8afd6ca5 RP |
214 | |
215 | validate_files (); | |
216 | ||
217 | /* Find the data section */ | |
218 | if (build_section_table (core_bfd, &core_ops.to_sections, | |
219 | &core_ops.to_sections_end)) | |
62a64dde SS |
220 | error ("\"%s\": Can't find sections: %s", |
221 | bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ())); | |
8afd6ca5 RP |
222 | |
223 | ontop = !push_target (&core_ops); | |
224 | discard_cleanups (old_chain); | |
225 | ||
226 | p = bfd_core_file_failing_command (core_bfd); | |
227 | if (p) | |
228 | printf_filtered ("Core was generated by `%s'.\n", p); | |
229 | ||
230 | siggy = bfd_core_file_failing_signal (core_bfd); | |
231 | if (siggy > 0) | |
232 | printf_filtered ("Program terminated with signal %d, %s.\n", siggy, | |
62a64dde | 233 | safe_strsignal (siggy)); |
8afd6ca5 | 234 | |
d113e6b2 SG |
235 | /* Build up thread list from BFD sections. */ |
236 | ||
237 | init_thread_list (); | |
238 | bfd_map_over_sections (core_bfd, add_to_thread_list, | |
239 | bfd_get_section_by_name (core_bfd, ".reg")); | |
240 | ||
62a64dde SS |
241 | if (ontop) |
242 | { | |
243 | /* Fetch all registers from core file. */ | |
244 | target_fetch_registers (-1); | |
8afd6ca5 | 245 | |
62a64dde | 246 | /* Add symbols and section mappings for any shared libraries. */ |
8afd6ca5 | 247 | #ifdef SOLIB_ADD |
62a64dde SS |
248 | catch_errors (solib_add_stub, &from_tty, (char *)0, |
249 | RETURN_MASK_ALL); | |
8afd6ca5 RP |
250 | #endif |
251 | ||
62a64dde SS |
252 | /* Now, set up the frame cache, and print the top of stack. */ |
253 | flush_cached_frames (); | |
254 | select_frame (get_current_frame (), 0); | |
255 | print_stack_frame (selected_frame, selected_frame_level, 1); | |
256 | } | |
257 | else | |
258 | { | |
259 | warning ( | |
8afd6ca5 | 260 | "you won't be able to access this core file until you terminate\n\ |
cad1498f | 261 | your %s; do ``info files''", target_longname); |
62a64dde | 262 | } |
8afd6ca5 RP |
263 | } |
264 | ||
0d2d8412 | 265 | static void |
8afd6ca5 RP |
266 | core_detach (args, from_tty) |
267 | char *args; | |
268 | int from_tty; | |
269 | { | |
270 | if (args) | |
271 | error ("Too many arguments"); | |
272 | unpush_target (&core_ops); | |
c5198d93 | 273 | reinit_frame_cache (); |
8afd6ca5 RP |
274 | if (from_tty) |
275 | printf_filtered ("No core file now.\n"); | |
276 | } | |
277 | ||
278 | /* Get the registers out of a core file. This is the machine- | |
279 | independent part. Fetch_core_registers is the machine-dependent | |
280 | part, typically implemented in the xm-file for each architecture. */ | |
281 | ||
282 | /* We just get all the registers, so we don't use regno. */ | |
62a64dde | 283 | |
8afd6ca5 RP |
284 | /* ARGSUSED */ |
285 | static void | |
286 | get_core_registers (regno) | |
287 | int regno; | |
288 | { | |
289 | sec_ptr reg_sec; | |
290 | unsigned size; | |
291 | char *the_regs; | |
27f1958c | 292 | char secname[30]; |
a1df8e78 | 293 | enum bfd_flavour our_flavour = bfd_get_flavour (core_bfd); |
95b71071 | 294 | struct core_fns *cf = NULL; |
a1df8e78 FF |
295 | |
296 | if (core_file_fns == NULL) | |
297 | { | |
298 | fprintf_filtered (gdb_stderr, | |
299 | "Can't fetch registers from this type of core file\n"); | |
300 | return; | |
301 | } | |
d113e6b2 SG |
302 | |
303 | /* Thread support. If inferior_pid is non-zero, then we have found a core | |
304 | file with threads (or multiple processes). In that case, we need to | |
305 | use the appropriate register section, else we just use `.reg'. */ | |
306 | ||
307 | /* XXX - same thing needs to be done for floating-point (.reg2) sections. */ | |
308 | ||
309 | if (inferior_pid) | |
310 | sprintf (secname, ".reg/%d", inferior_pid); | |
311 | else | |
312 | strcpy (secname, ".reg"); | |
8afd6ca5 | 313 | |
d113e6b2 | 314 | reg_sec = bfd_get_section_by_name (core_bfd, secname); |
62a64dde SS |
315 | if (!reg_sec) |
316 | goto cant; | |
8afd6ca5 RP |
317 | size = bfd_section_size (core_bfd, reg_sec); |
318 | the_regs = alloca (size); | |
a1df8e78 FF |
319 | /* Look for the core functions that match this flavor. Default to the |
320 | first one if nothing matches. */ | |
321 | for (cf = core_file_fns; cf != NULL; cf = cf -> next) | |
322 | { | |
323 | if (our_flavour == cf -> core_flavour) | |
324 | { | |
325 | break; | |
326 | } | |
327 | } | |
328 | if (cf == NULL) | |
329 | { | |
330 | cf = core_file_fns; | |
331 | } | |
332 | if (cf != NULL && | |
333 | bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size) && | |
334 | cf -> core_read_registers != NULL) | |
8afd6ca5 | 335 | { |
a1df8e78 FF |
336 | (cf -> core_read_registers (the_regs, size, 0, |
337 | (unsigned) bfd_section_vma (abfd,reg_sec))); | |
8afd6ca5 RP |
338 | } |
339 | else | |
340 | { | |
341 | cant: | |
62a64dde SS |
342 | fprintf_filtered (gdb_stderr, |
343 | "Couldn't fetch registers from core file: %s\n", | |
344 | bfd_errmsg (bfd_get_error ())); | |
8afd6ca5 RP |
345 | } |
346 | ||
347 | /* Now do it again for the float registers, if they exist. */ | |
348 | reg_sec = bfd_get_section_by_name (core_bfd, ".reg2"); | |
62a64dde SS |
349 | if (reg_sec) |
350 | { | |
351 | size = bfd_section_size (core_bfd, reg_sec); | |
352 | the_regs = alloca (size); | |
a1df8e78 FF |
353 | if (cf != NULL && |
354 | bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr)0, size) && | |
355 | cf -> core_read_registers != NULL) | |
62a64dde | 356 | { |
a1df8e78 FF |
357 | (cf -> core_read_registers (the_regs, size, 2, |
358 | (unsigned) bfd_section_vma (abfd,reg_sec))); | |
62a64dde SS |
359 | } |
360 | else | |
361 | { | |
362 | fprintf_filtered (gdb_stderr, | |
363 | "Couldn't fetch register set 2 from core file: %s\n", | |
364 | bfd_errmsg (bfd_get_error ())); | |
365 | } | |
366 | } | |
367 | registers_fetched (); | |
8afd6ca5 RP |
368 | } |
369 | ||
4ef1f467 DT |
370 | static char * |
371 | core_file_to_sym_file (core) | |
372 | char * core; | |
373 | { | |
374 | CONST char * failing_command; | |
375 | char * p; | |
376 | char * temp; | |
377 | bfd * temp_bfd; | |
378 | int scratch_chan; | |
379 | ||
380 | if (! core) | |
381 | error ("No core file specified."); | |
382 | ||
383 | core = tilde_expand (core); | |
384 | if (core[0] != '/') | |
385 | { | |
386 | temp = concat (current_directory, "/", core, NULL); | |
387 | core = temp; | |
388 | } | |
389 | ||
390 | scratch_chan = open (core, write_files ? O_RDWR : O_RDONLY, 0); | |
391 | if (scratch_chan < 0) | |
392 | perror_with_name (core); | |
393 | ||
394 | temp_bfd = bfd_fdopenr (core, gnutarget, scratch_chan); | |
395 | if (temp_bfd == NULL) | |
396 | perror_with_name (core); | |
397 | ||
398 | if (!bfd_check_format (temp_bfd, bfd_core)) | |
399 | { | |
400 | /* Do it after the err msg */ | |
401 | /* FIXME: should be checking for errors from bfd_close (for one thing, | |
402 | on error it does not free all the storage associated with the | |
403 | bfd). */ | |
404 | make_cleanup (bfd_close, temp_bfd); | |
405 | error ("\"%s\" is not a core dump: %s", | |
406 | core, bfd_errmsg (bfd_get_error ())); | |
407 | } | |
408 | ||
409 | /* Find the data section */ | |
410 | if (build_section_table (temp_bfd, &core_ops.to_sections, | |
411 | &core_ops.to_sections_end)) | |
412 | error ("\"%s\": Can't find sections: %s", | |
413 | bfd_get_filename (temp_bfd), bfd_errmsg (bfd_get_error ())); | |
414 | ||
415 | failing_command = bfd_core_file_failing_command (temp_bfd); | |
416 | ||
417 | bfd_close (temp_bfd); | |
418 | ||
419 | /* If we found a filename, remember that it is probably saved | |
420 | relative to the executable that created it. If working directory | |
421 | isn't there now, we may not be able to find the executable. Rather | |
422 | than trying to be sauve about finding it, just check if the file | |
423 | exists where we are now. If not, then punt and tell our client | |
424 | we couldn't find the sym file. | |
425 | */ | |
426 | p = (char *) failing_command; | |
427 | if ((p != NULL) && (access (p, F_OK) != 0)) | |
428 | p = NULL; | |
429 | ||
430 | return p; | |
431 | } | |
432 | ||
8afd6ca5 RP |
433 | static void |
434 | core_files_info (t) | |
435 | struct target_ops *t; | |
436 | { | |
437 | print_section_info (t, core_bfd); | |
438 | } | |
439 | \f | |
f47e56c9 | 440 | /* If mourn is being called in all the right places, this could be say |
cf3e377e | 441 | `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */ |
f47e56c9 JK |
442 | |
443 | static int | |
444 | ignore (addr, contents) | |
445 | CORE_ADDR addr; | |
446 | char *contents; | |
447 | { | |
100f92e2 | 448 | return 0; |
f47e56c9 JK |
449 | } |
450 | ||
4ef1f467 DT |
451 | |
452 | /* Okay, let's be honest: threads gleaned from a core file aren't | |
453 | exactly lively, are they? On the other hand, if we don't claim | |
454 | that each & every one is alive, then we don't get any of them | |
455 | to appear in an "info thread" command, which is quite a useful | |
456 | behaviour. | |
457 | */ | |
458 | static int | |
459 | core_file_thread_alive (tid) | |
460 | int tid; | |
461 | { | |
462 | return 1; | |
463 | } | |
464 | ||
4c49748e | 465 | /* Fill in core_ops with its defined operations and properties. */ |
4ef1f467 | 466 | |
4c49748e SS |
467 | static void |
468 | init_core_ops () | |
469 | { | |
470 | core_ops.to_shortname = "core"; | |
471 | core_ops.to_longname = "Local core dump file"; | |
472 | core_ops.to_doc = | |
473 | "Use a core file as a target. Specify the filename of the core file."; | |
474 | core_ops.to_open = core_open; | |
475 | core_ops.to_close = core_close; | |
476 | core_ops.to_attach = find_default_attach; | |
477 | core_ops.to_require_attach = find_default_require_attach; | |
478 | core_ops.to_detach = core_detach; | |
479 | core_ops.to_require_detach = find_default_require_detach; | |
480 | core_ops.to_fetch_registers = get_core_registers; | |
481 | core_ops.to_xfer_memory = xfer_memory; | |
482 | core_ops.to_files_info = core_files_info; | |
483 | core_ops.to_insert_breakpoint = ignore; | |
484 | core_ops.to_remove_breakpoint = ignore; | |
485 | core_ops.to_create_inferior = find_default_create_inferior; | |
486 | core_ops.to_clone_and_follow_inferior = find_default_clone_and_follow_inferior; | |
487 | core_ops.to_thread_alive = core_file_thread_alive; | |
488 | core_ops.to_core_file_to_sym_file = core_file_to_sym_file; | |
489 | core_ops.to_stratum = core_stratum; | |
490 | core_ops.to_has_memory = 1; | |
491 | core_ops.to_has_stack = 1; | |
492 | core_ops.to_has_registers = 1; | |
493 | core_ops.to_magic = OPS_MAGIC; | |
494 | } | |
8afd6ca5 | 495 | |
0274a484 DT |
496 | /* non-zero if we should not do the add_target call in |
497 | _initialize_corelow; not initialized (i.e., bss) so that | |
498 | the target can initialize it (i.e., data) if appropriate. | |
499 | This needs to be set at compile time because we don't know | |
500 | for sure whether the target's initialize routine is called | |
501 | before us or after us. */ | |
502 | int coreops_suppress_target; | |
503 | ||
8afd6ca5 | 504 | void |
24418cfb | 505 | _initialize_corelow () |
8afd6ca5 | 506 | { |
4c49748e SS |
507 | init_core_ops (); |
508 | ||
0274a484 DT |
509 | if (!coreops_suppress_target) |
510 | add_target (&core_ops); | |
8afd6ca5 | 511 | } |