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c906108c SS |
1 | /* Core dump and executable file functions below target vector, for GDB. |
2 | Copyright 1986, 87, 89, 91, 92, 93, 94, 95, 96, 97, 1998 | |
3 | Free Software Foundation, Inc. | |
4 | ||
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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. | |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b JM |
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, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "gdb_string.h" | |
24 | #include <errno.h> | |
25 | #include <signal.h> | |
26 | #include <fcntl.h> | |
27 | #include <unistd.h> | |
c5aa993b | 28 | #include "frame.h" /* required by inferior.h */ |
c906108c SS |
29 | #include "inferior.h" |
30 | #include "symtab.h" | |
31 | #include "command.h" | |
32 | #include "bfd.h" | |
33 | #include "target.h" | |
34 | #include "gdbcore.h" | |
35 | #include "gdbthread.h" | |
36 | ||
37 | /* List of all available core_fns. On gdb startup, each core file register | |
38 | reader calls add_core_fns() to register information on each core format it | |
39 | is prepared to read. */ | |
40 | ||
41 | static struct core_fns *core_file_fns = NULL; | |
42 | ||
43 | static void core_files_info PARAMS ((struct target_ops *)); | |
44 | ||
45 | #ifdef SOLIB_ADD | |
46 | static int solib_add_stub PARAMS ((PTR)); | |
47 | #endif | |
48 | ||
49 | static void core_open PARAMS ((char *, int)); | |
50 | ||
51 | static void core_detach PARAMS ((char *, int)); | |
52 | ||
53 | static void core_close PARAMS ((int)); | |
54 | ||
55 | static void get_core_registers PARAMS ((int)); | |
56 | ||
57 | static void add_to_thread_list PARAMS ((bfd *, asection *, PTR)); | |
58 | ||
59 | static int ignore PARAMS ((CORE_ADDR, char *)); | |
60 | ||
61 | static char *core_file_to_sym_file PARAMS ((char *)); | |
62 | ||
63 | static int core_file_thread_alive PARAMS ((int tid)); | |
64 | ||
65 | static void init_core_ops PARAMS ((void)); | |
66 | ||
67 | void _initialize_corelow PARAMS ((void)); | |
68 | ||
69 | struct target_ops core_ops; | |
70 | ||
71 | /* Link a new core_fns into the global core_file_fns list. Called on gdb | |
72 | startup by the _initialize routine in each core file register reader, to | |
73 | register information about each format the the reader is prepared to | |
74 | handle. */ | |
75 | ||
76 | void | |
77 | add_core_fns (cf) | |
78 | struct core_fns *cf; | |
79 | { | |
c5aa993b | 80 | cf->next = core_file_fns; |
c906108c SS |
81 | core_file_fns = cf; |
82 | } | |
83 | ||
84 | ||
85 | /* Discard all vestiges of any previous core file and mark data and stack | |
86 | spaces as empty. */ | |
87 | ||
88 | /* ARGSUSED */ | |
89 | static void | |
90 | core_close (quitting) | |
91 | int quitting; | |
92 | { | |
93 | char *name; | |
94 | ||
95 | if (core_bfd) | |
96 | { | |
97 | inferior_pid = 0; /* Avoid confusion from thread stuff */ | |
98 | ||
7a292a7a | 99 | /* Clear out solib state while the bfd is still open. See |
c5aa993b | 100 | comments in clear_solib in solib.c. */ |
7a292a7a SS |
101 | #ifdef CLEAR_SOLIB |
102 | CLEAR_SOLIB (); | |
103 | #endif | |
104 | ||
c906108c SS |
105 | name = bfd_get_filename (core_bfd); |
106 | if (!bfd_close (core_bfd)) | |
107 | warning ("cannot close \"%s\": %s", | |
108 | name, bfd_errmsg (bfd_get_error ())); | |
109 | free (name); | |
110 | core_bfd = NULL; | |
c906108c SS |
111 | if (core_ops.to_sections) |
112 | { | |
c5aa993b | 113 | free ((PTR) core_ops.to_sections); |
c906108c SS |
114 | core_ops.to_sections = NULL; |
115 | core_ops.to_sections_end = NULL; | |
116 | } | |
117 | } | |
118 | } | |
119 | ||
120 | #ifdef SOLIB_ADD | |
121 | /* Stub function for catch_errors around shared library hacking. FROM_TTYP | |
122 | is really an int * which points to from_tty. */ | |
123 | ||
c5aa993b | 124 | static int |
c906108c SS |
125 | solib_add_stub (from_ttyp) |
126 | PTR from_ttyp; | |
127 | { | |
c5aa993b | 128 | SOLIB_ADD (NULL, *(int *) from_ttyp, ¤t_target); |
c906108c SS |
129 | re_enable_breakpoints_in_shlibs (); |
130 | return 0; | |
131 | } | |
132 | #endif /* SOLIB_ADD */ | |
133 | ||
134 | /* Look for sections whose names start with `.reg/' so that we can extract the | |
135 | list of threads in a core file. */ | |
136 | ||
137 | static void | |
138 | add_to_thread_list (abfd, asect, reg_sect_arg) | |
139 | bfd *abfd; | |
140 | asection *asect; | |
141 | PTR reg_sect_arg; | |
142 | { | |
143 | int thread_id; | |
144 | asection *reg_sect = (asection *) reg_sect_arg; | |
145 | ||
146 | if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0) | |
147 | return; | |
148 | ||
149 | thread_id = atoi (bfd_section_name (abfd, asect) + 5); | |
150 | ||
151 | add_thread (thread_id); | |
152 | ||
153 | /* Warning, Will Robinson, looking at BFD private data! */ | |
154 | ||
155 | if (reg_sect != NULL | |
c5aa993b | 156 | && asect->filepos == reg_sect->filepos) /* Did we find .reg? */ |
c906108c SS |
157 | inferior_pid = thread_id; /* Yes, make it current */ |
158 | } | |
159 | ||
160 | /* This routine opens and sets up the core file bfd. */ | |
161 | ||
162 | static void | |
163 | core_open (filename, from_tty) | |
164 | char *filename; | |
165 | int from_tty; | |
166 | { | |
167 | const char *p; | |
168 | int siggy; | |
169 | struct cleanup *old_chain; | |
170 | char *temp; | |
171 | bfd *temp_bfd; | |
172 | int ontop; | |
173 | int scratch_chan; | |
174 | ||
175 | target_preopen (from_tty); | |
176 | if (!filename) | |
177 | { | |
c5aa993b JM |
178 | error (core_bfd ? |
179 | "No core file specified. (Use `detach' to stop debugging a core file.)" | |
180 | : "No core file specified."); | |
c906108c SS |
181 | } |
182 | ||
183 | filename = tilde_expand (filename); | |
184 | if (filename[0] != '/') | |
185 | { | |
186 | temp = concat (current_directory, "/", filename, NULL); | |
187 | free (filename); | |
188 | filename = temp; | |
189 | } | |
190 | ||
191 | old_chain = make_cleanup (free, filename); | |
192 | ||
193 | scratch_chan = open (filename, write_files ? O_RDWR : O_RDONLY, 0); | |
194 | if (scratch_chan < 0) | |
195 | perror_with_name (filename); | |
196 | ||
197 | temp_bfd = bfd_fdopenr (filename, gnutarget, scratch_chan); | |
198 | if (temp_bfd == NULL) | |
199 | perror_with_name (filename); | |
200 | ||
201 | if (!bfd_check_format (temp_bfd, bfd_core)) | |
202 | { | |
203 | /* Do it after the err msg */ | |
204 | /* FIXME: should be checking for errors from bfd_close (for one thing, | |
c5aa993b JM |
205 | on error it does not free all the storage associated with the |
206 | bfd). */ | |
c906108c SS |
207 | make_cleanup ((make_cleanup_func) bfd_close, temp_bfd); |
208 | error ("\"%s\" is not a core dump: %s", | |
209 | filename, bfd_errmsg (bfd_get_error ())); | |
210 | } | |
211 | ||
212 | /* Looks semi-reasonable. Toss the old core file and work on the new. */ | |
213 | ||
c5aa993b | 214 | discard_cleanups (old_chain); /* Don't free filename any more */ |
c906108c SS |
215 | unpush_target (&core_ops); |
216 | core_bfd = temp_bfd; | |
217 | old_chain = make_cleanup ((make_cleanup_func) core_close, core_bfd); | |
218 | ||
219 | validate_files (); | |
220 | ||
221 | /* Find the data section */ | |
222 | if (build_section_table (core_bfd, &core_ops.to_sections, | |
223 | &core_ops.to_sections_end)) | |
224 | error ("\"%s\": Can't find sections: %s", | |
225 | bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ())); | |
226 | ||
227 | ontop = !push_target (&core_ops); | |
228 | discard_cleanups (old_chain); | |
229 | ||
230 | p = bfd_core_file_failing_command (core_bfd); | |
231 | if (p) | |
232 | printf_filtered ("Core was generated by `%s'.\n", p); | |
233 | ||
234 | siggy = bfd_core_file_failing_signal (core_bfd); | |
235 | if (siggy > 0) | |
236 | printf_filtered ("Program terminated with signal %d, %s.\n", siggy, | |
237 | safe_strsignal (siggy)); | |
238 | ||
239 | /* Build up thread list from BFD sections. */ | |
240 | ||
241 | init_thread_list (); | |
242 | bfd_map_over_sections (core_bfd, add_to_thread_list, | |
243 | bfd_get_section_by_name (core_bfd, ".reg")); | |
244 | ||
245 | if (ontop) | |
246 | { | |
247 | /* Fetch all registers from core file. */ | |
248 | target_fetch_registers (-1); | |
249 | ||
250 | /* Add symbols and section mappings for any shared libraries. */ | |
251 | #ifdef SOLIB_ADD | |
c5aa993b | 252 | catch_errors (solib_add_stub, &from_tty, (char *) 0, |
c906108c SS |
253 | RETURN_MASK_ALL); |
254 | #endif | |
255 | ||
256 | /* Now, set up the frame cache, and print the top of stack. */ | |
257 | flush_cached_frames (); | |
258 | select_frame (get_current_frame (), 0); | |
259 | print_stack_frame (selected_frame, selected_frame_level, 1); | |
260 | } | |
261 | else | |
262 | { | |
263 | warning ( | |
c5aa993b | 264 | "you won't be able to access this core file until you terminate\n\ |
c906108c SS |
265 | your %s; do ``info files''", target_longname); |
266 | } | |
267 | } | |
268 | ||
269 | static void | |
270 | core_detach (args, from_tty) | |
271 | char *args; | |
272 | int from_tty; | |
273 | { | |
274 | if (args) | |
275 | error ("Too many arguments"); | |
276 | unpush_target (&core_ops); | |
277 | reinit_frame_cache (); | |
278 | if (from_tty) | |
279 | printf_filtered ("No core file now.\n"); | |
280 | } | |
281 | ||
282 | /* Get the registers out of a core file. This is the machine- | |
283 | independent part. Fetch_core_registers is the machine-dependent | |
284 | part, typically implemented in the xm-file for each architecture. */ | |
285 | ||
286 | /* We just get all the registers, so we don't use regno. */ | |
287 | ||
288 | /* ARGSUSED */ | |
289 | static void | |
290 | get_core_registers (regno) | |
291 | int regno; | |
292 | { | |
293 | sec_ptr reg_sec; | |
294 | unsigned size; | |
295 | char *the_regs; | |
296 | char secname[30]; | |
297 | enum bfd_flavour our_flavour = bfd_get_flavour (core_bfd); | |
298 | struct core_fns *cf = NULL; | |
299 | ||
300 | if (core_file_fns == NULL) | |
301 | { | |
302 | fprintf_filtered (gdb_stderr, | |
c5aa993b | 303 | "Can't fetch registers from this type of core file\n"); |
c906108c SS |
304 | return; |
305 | } | |
306 | ||
307 | /* Thread support. If inferior_pid is non-zero, then we have found a core | |
308 | file with threads (or multiple processes). In that case, we need to | |
309 | use the appropriate register section, else we just use `.reg'. */ | |
310 | ||
311 | /* XXX - same thing needs to be done for floating-point (.reg2) sections. */ | |
312 | ||
313 | if (inferior_pid) | |
314 | sprintf (secname, ".reg/%d", inferior_pid); | |
315 | else | |
316 | strcpy (secname, ".reg"); | |
317 | ||
318 | reg_sec = bfd_get_section_by_name (core_bfd, secname); | |
319 | if (!reg_sec) | |
320 | goto cant; | |
321 | size = bfd_section_size (core_bfd, reg_sec); | |
322 | the_regs = alloca (size); | |
323 | /* Look for the core functions that match this flavor. Default to the | |
324 | first one if nothing matches. */ | |
c5aa993b | 325 | for (cf = core_file_fns; cf != NULL; cf = cf->next) |
c906108c | 326 | { |
c5aa993b | 327 | if (our_flavour == cf->core_flavour) |
c906108c SS |
328 | { |
329 | break; | |
330 | } | |
331 | } | |
332 | if (cf == NULL) | |
333 | { | |
334 | cf = core_file_fns; | |
335 | } | |
336 | if (cf != NULL && | |
c5aa993b JM |
337 | bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr) 0, size) && |
338 | cf->core_read_registers != NULL) | |
c906108c | 339 | { |
c5aa993b JM |
340 | (cf->core_read_registers (the_regs, size, 0, |
341 | (unsigned) bfd_section_vma (abfd, reg_sec))); | |
c906108c SS |
342 | } |
343 | else | |
344 | { | |
c5aa993b | 345 | cant: |
c906108c SS |
346 | fprintf_filtered (gdb_stderr, |
347 | "Couldn't fetch registers from core file: %s\n", | |
348 | bfd_errmsg (bfd_get_error ())); | |
349 | } | |
350 | ||
351 | /* Now do it again for the float registers, if they exist. */ | |
352 | reg_sec = bfd_get_section_by_name (core_bfd, ".reg2"); | |
353 | if (reg_sec) | |
354 | { | |
355 | size = bfd_section_size (core_bfd, reg_sec); | |
356 | the_regs = alloca (size); | |
357 | if (cf != NULL && | |
c5aa993b JM |
358 | bfd_get_section_contents (core_bfd, reg_sec, the_regs, (file_ptr) 0, size) && |
359 | cf->core_read_registers != NULL) | |
c906108c | 360 | { |
c5aa993b JM |
361 | (cf->core_read_registers (the_regs, size, 2, |
362 | (unsigned) bfd_section_vma (abfd, reg_sec))); | |
c906108c SS |
363 | } |
364 | else | |
365 | { | |
c5aa993b JM |
366 | fprintf_filtered (gdb_stderr, |
367 | "Couldn't fetch register set 2 from core file: %s\n", | |
c906108c SS |
368 | bfd_errmsg (bfd_get_error ())); |
369 | } | |
370 | } | |
371 | registers_fetched (); | |
372 | } | |
373 | ||
374 | static char * | |
375 | core_file_to_sym_file (core) | |
c5aa993b | 376 | char *core; |
c906108c | 377 | { |
c5aa993b JM |
378 | CONST char *failing_command; |
379 | char *p; | |
380 | char *temp; | |
381 | bfd *temp_bfd; | |
382 | int scratch_chan; | |
c906108c | 383 | |
c5aa993b | 384 | if (!core) |
c906108c SS |
385 | error ("No core file specified."); |
386 | ||
387 | core = tilde_expand (core); | |
388 | if (core[0] != '/') | |
389 | { | |
390 | temp = concat (current_directory, "/", core, NULL); | |
391 | core = temp; | |
392 | } | |
393 | ||
394 | scratch_chan = open (core, write_files ? O_RDWR : O_RDONLY, 0); | |
395 | if (scratch_chan < 0) | |
396 | perror_with_name (core); | |
397 | ||
398 | temp_bfd = bfd_fdopenr (core, gnutarget, scratch_chan); | |
399 | if (temp_bfd == NULL) | |
400 | perror_with_name (core); | |
401 | ||
402 | if (!bfd_check_format (temp_bfd, bfd_core)) | |
403 | { | |
404 | /* Do it after the err msg */ | |
405 | /* FIXME: should be checking for errors from bfd_close (for one thing, | |
c5aa993b JM |
406 | on error it does not free all the storage associated with the |
407 | bfd). */ | |
c906108c SS |
408 | make_cleanup ((make_cleanup_func) bfd_close, temp_bfd); |
409 | error ("\"%s\" is not a core dump: %s", | |
410 | core, bfd_errmsg (bfd_get_error ())); | |
411 | } | |
412 | ||
413 | /* Find the data section */ | |
414 | if (build_section_table (temp_bfd, &core_ops.to_sections, | |
415 | &core_ops.to_sections_end)) | |
416 | error ("\"%s\": Can't find sections: %s", | |
417 | bfd_get_filename (temp_bfd), bfd_errmsg (bfd_get_error ())); | |
418 | ||
419 | failing_command = bfd_core_file_failing_command (temp_bfd); | |
420 | ||
421 | bfd_close (temp_bfd); | |
422 | ||
423 | /* If we found a filename, remember that it is probably saved | |
424 | relative to the executable that created it. If working directory | |
425 | isn't there now, we may not be able to find the executable. Rather | |
426 | than trying to be sauve about finding it, just check if the file | |
427 | exists where we are now. If not, then punt and tell our client | |
428 | we couldn't find the sym file. | |
c5aa993b | 429 | */ |
c906108c SS |
430 | p = (char *) failing_command; |
431 | if ((p != NULL) && (access (p, F_OK) != 0)) | |
432 | p = NULL; | |
433 | ||
434 | return p; | |
435 | } | |
436 | ||
437 | static void | |
438 | core_files_info (t) | |
c5aa993b | 439 | struct target_ops *t; |
c906108c SS |
440 | { |
441 | print_section_info (t, core_bfd); | |
442 | } | |
443 | \f | |
444 | /* If mourn is being called in all the right places, this could be say | |
445 | `gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */ | |
446 | ||
447 | static int | |
448 | ignore (addr, contents) | |
449 | CORE_ADDR addr; | |
450 | char *contents; | |
451 | { | |
452 | return 0; | |
453 | } | |
454 | ||
455 | ||
456 | /* Okay, let's be honest: threads gleaned from a core file aren't | |
457 | exactly lively, are they? On the other hand, if we don't claim | |
458 | that each & every one is alive, then we don't get any of them | |
459 | to appear in an "info thread" command, which is quite a useful | |
460 | behaviour. | |
c5aa993b | 461 | */ |
c906108c SS |
462 | static int |
463 | core_file_thread_alive (tid) | |
c5aa993b | 464 | int tid; |
c906108c SS |
465 | { |
466 | return 1; | |
467 | } | |
468 | ||
469 | /* Fill in core_ops with its defined operations and properties. */ | |
470 | ||
471 | static void | |
472 | init_core_ops () | |
473 | { | |
474 | core_ops.to_shortname = "core"; | |
475 | core_ops.to_longname = "Local core dump file"; | |
476 | core_ops.to_doc = | |
477 | "Use a core file as a target. Specify the filename of the core file."; | |
478 | core_ops.to_open = core_open; | |
479 | core_ops.to_close = core_close; | |
480 | core_ops.to_attach = find_default_attach; | |
481 | core_ops.to_require_attach = find_default_require_attach; | |
482 | core_ops.to_detach = core_detach; | |
483 | core_ops.to_require_detach = find_default_require_detach; | |
484 | core_ops.to_fetch_registers = get_core_registers; | |
485 | core_ops.to_xfer_memory = xfer_memory; | |
486 | core_ops.to_files_info = core_files_info; | |
487 | core_ops.to_insert_breakpoint = ignore; | |
488 | core_ops.to_remove_breakpoint = ignore; | |
489 | core_ops.to_create_inferior = find_default_create_inferior; | |
490 | core_ops.to_clone_and_follow_inferior = find_default_clone_and_follow_inferior; | |
491 | core_ops.to_thread_alive = core_file_thread_alive; | |
492 | core_ops.to_core_file_to_sym_file = core_file_to_sym_file; | |
493 | core_ops.to_stratum = core_stratum; | |
494 | core_ops.to_has_memory = 1; | |
495 | core_ops.to_has_stack = 1; | |
496 | core_ops.to_has_registers = 1; | |
c5aa993b | 497 | core_ops.to_magic = OPS_MAGIC; |
c906108c SS |
498 | } |
499 | ||
500 | /* non-zero if we should not do the add_target call in | |
501 | _initialize_corelow; not initialized (i.e., bss) so that | |
502 | the target can initialize it (i.e., data) if appropriate. | |
503 | This needs to be set at compile time because we don't know | |
504 | for sure whether the target's initialize routine is called | |
505 | before us or after us. */ | |
506 | int coreops_suppress_target; | |
507 | ||
508 | void | |
509 | _initialize_corelow () | |
510 | { | |
511 | init_core_ops (); | |
512 | ||
513 | if (!coreops_suppress_target) | |
514 | add_target (&core_ops); | |
515 | } |