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c906108c | 1 | /* Core dump and executable file functions above target vector, for GDB. |
1bac305b | 2 | |
0b302171 | 3 | Copyright (C) 1986-1987, 1989, 1991-1994, 1996-2001, 2003, 2006-2012 |
0fb0cc75 | 4 | Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "gdb_string.h" | |
23 | #include <errno.h> | |
24 | #include <signal.h> | |
25 | #include <fcntl.h> | |
c906108c SS |
26 | #include "inferior.h" |
27 | #include "symtab.h" | |
28 | #include "command.h" | |
29 | #include "gdbcmd.h" | |
30 | #include "bfd.h" | |
31 | #include "target.h" | |
32 | #include "gdbcore.h" | |
33 | #include "dis-asm.h" | |
c906108c | 34 | #include "gdb_stat.h" |
d75b5104 | 35 | #include "completer.h" |
60250e8b | 36 | #include "exceptions.h" |
c906108c | 37 | |
c906108c SS |
38 | /* Local function declarations. */ |
39 | ||
a14ed312 KB |
40 | extern void _initialize_core (void); |
41 | static void call_extra_exec_file_hooks (char *filename); | |
c906108c | 42 | |
9a4105ab AC |
43 | /* You can have any number of hooks for `exec_file_command' command to |
44 | call. If there's only one hook, it is set in exec_file_display | |
45 | hook. If there are two or more hooks, they are set in | |
46 | exec_file_extra_hooks[], and deprecated_exec_file_display_hook is | |
47 | set to a function that calls all of them. This extra complexity is | |
48 | needed to preserve compatibility with old code that assumed that | |
49 | only one hook could be set, and which called | |
50 | deprecated_exec_file_display_hook directly. */ | |
c906108c | 51 | |
507f3c78 | 52 | typedef void (*hook_type) (char *); |
c906108c | 53 | |
aff410f1 MS |
54 | hook_type deprecated_exec_file_display_hook; /* The original hook. */ |
55 | static hook_type *exec_file_extra_hooks; /* Array of additional | |
56 | hooks. */ | |
57 | static int exec_file_hook_count = 0; /* Size of array. */ | |
c906108c SS |
58 | |
59 | /* Binary file diddling handle for the core file. */ | |
60 | ||
61 | bfd *core_bfd = NULL; | |
c0edd9ed JK |
62 | |
63 | /* corelow.c target (if included for this gdb target). */ | |
64 | ||
65 | struct target_ops *core_target; | |
c906108c | 66 | \f |
c5aa993b | 67 | |
c906108c SS |
68 | /* Backward compatability with old way of specifying core files. */ |
69 | ||
70 | void | |
fba45db2 | 71 | core_file_command (char *filename, int from_tty) |
c906108c | 72 | { |
aff410f1 | 73 | dont_repeat (); /* Either way, seems bogus. */ |
c906108c | 74 | |
c0edd9ed | 75 | if (core_target == NULL) |
8a3fe4f8 | 76 | error (_("GDB can't read core files on this machine.")); |
46c6cdcf C |
77 | |
78 | if (!filename) | |
c0edd9ed | 79 | (core_target->to_detach) (core_target, filename, from_tty); |
46c6cdcf | 80 | else |
c0edd9ed | 81 | (core_target->to_open) (filename, from_tty); |
c906108c | 82 | } |
c906108c | 83 | \f |
c5aa993b | 84 | |
de6854b5 MS |
85 | /* If there are two or more functions that wish to hook into |
86 | exec_file_command, this function will call all of the hook | |
87 | functions. */ | |
c906108c SS |
88 | |
89 | static void | |
fba45db2 | 90 | call_extra_exec_file_hooks (char *filename) |
c906108c SS |
91 | { |
92 | int i; | |
93 | ||
94 | for (i = 0; i < exec_file_hook_count; i++) | |
c5aa993b | 95 | (*exec_file_extra_hooks[i]) (filename); |
c906108c SS |
96 | } |
97 | ||
98 | /* Call this to specify the hook for exec_file_command to call back. | |
99 | This is called from the x-window display code. */ | |
100 | ||
101 | void | |
dbb41be1 | 102 | specify_exec_file_hook (void (*hook) (char *)) |
c906108c SS |
103 | { |
104 | hook_type *new_array; | |
105 | ||
9a4105ab | 106 | if (deprecated_exec_file_display_hook != NULL) |
c906108c SS |
107 | { |
108 | /* There's already a hook installed. Arrange to have both it | |
aff410f1 | 109 | and the subsequent hooks called. */ |
c906108c SS |
110 | if (exec_file_hook_count == 0) |
111 | { | |
aff410f1 MS |
112 | /* If this is the first extra hook, initialize the hook |
113 | array. */ | |
114 | exec_file_extra_hooks = (hook_type *) | |
115 | xmalloc (sizeof (hook_type)); | |
9a4105ab AC |
116 | exec_file_extra_hooks[0] = deprecated_exec_file_display_hook; |
117 | deprecated_exec_file_display_hook = call_extra_exec_file_hooks; | |
c906108c SS |
118 | exec_file_hook_count = 1; |
119 | } | |
120 | ||
121 | /* Grow the hook array by one and add the new hook to the end. | |
122 | Yes, it's inefficient to grow it by one each time but since | |
123 | this is hardly ever called it's not a big deal. */ | |
124 | exec_file_hook_count++; | |
aff410f1 MS |
125 | new_array = (hook_type *) |
126 | xrealloc (exec_file_extra_hooks, | |
127 | exec_file_hook_count * sizeof (hook_type)); | |
c906108c SS |
128 | exec_file_extra_hooks = new_array; |
129 | exec_file_extra_hooks[exec_file_hook_count - 1] = hook; | |
130 | } | |
131 | else | |
9a4105ab | 132 | deprecated_exec_file_display_hook = hook; |
c906108c SS |
133 | } |
134 | ||
135 | /* The exec file must be closed before running an inferior. | |
136 | If it is needed again after the inferior dies, it must | |
137 | be reopened. */ | |
138 | ||
139 | void | |
fba45db2 | 140 | close_exec_file (void) |
c906108c | 141 | { |
c5aa993b | 142 | #if 0 /* FIXME */ |
c906108c SS |
143 | if (exec_bfd) |
144 | bfd_tempclose (exec_bfd); | |
145 | #endif | |
146 | } | |
147 | ||
148 | void | |
fba45db2 | 149 | reopen_exec_file (void) |
c906108c | 150 | { |
c5aa993b | 151 | #if 0 /* FIXME */ |
c906108c SS |
152 | if (exec_bfd) |
153 | bfd_reopen (exec_bfd); | |
154 | #else | |
155 | char *filename; | |
156 | int res; | |
157 | struct stat st; | |
f7545552 | 158 | struct cleanup *cleanups; |
c906108c | 159 | |
aff410f1 | 160 | /* Don't do anything if there isn't an exec file. */ |
4c42eaff | 161 | if (exec_bfd == NULL) |
c906108c | 162 | return; |
c5aa993b | 163 | |
aff410f1 | 164 | /* If the timestamp of the exec file has changed, reopen it. */ |
c2d11a7d | 165 | filename = xstrdup (bfd_get_filename (exec_bfd)); |
f7545552 | 166 | cleanups = make_cleanup (xfree, filename); |
c906108c SS |
167 | res = stat (filename, &st); |
168 | ||
c04ea773 | 169 | if (exec_bfd_mtime && exec_bfd_mtime != st.st_mtime) |
4c42eaff | 170 | exec_file_attach (filename, 0); |
939643d7 DJ |
171 | else |
172 | /* If we accessed the file since last opening it, close it now; | |
173 | this stops GDB from holding the executable open after it | |
174 | exits. */ | |
175 | bfd_cache_close_all (); | |
f7545552 TT |
176 | |
177 | do_cleanups (cleanups); | |
c906108c SS |
178 | #endif |
179 | } | |
180 | \f | |
181 | /* If we have both a core file and an exec file, | |
182 | print a warning if they don't go together. */ | |
183 | ||
184 | void | |
fba45db2 | 185 | validate_files (void) |
c906108c SS |
186 | { |
187 | if (exec_bfd && core_bfd) | |
188 | { | |
189 | if (!core_file_matches_executable_p (core_bfd, exec_bfd)) | |
8a3fe4f8 | 190 | warning (_("core file may not match specified executable file.")); |
c5aa993b | 191 | else if (bfd_get_mtime (exec_bfd) > bfd_get_mtime (core_bfd)) |
8a3fe4f8 | 192 | warning (_("exec file is newer than core file.")); |
c906108c SS |
193 | } |
194 | } | |
195 | ||
196 | /* Return the name of the executable file as a string. | |
197 | ERR nonzero means get error if there is none specified; | |
198 | otherwise return 0 in that case. */ | |
199 | ||
200 | char * | |
fba45db2 | 201 | get_exec_file (int err) |
c906108c | 202 | { |
c5aa993b JM |
203 | if (exec_bfd) |
204 | return bfd_get_filename (exec_bfd); | |
205 | if (!err) | |
206 | return NULL; | |
c906108c | 207 | |
8a3fe4f8 AC |
208 | error (_("No executable file specified.\n\ |
209 | Use the \"file\" or \"exec-file\" command.")); | |
c906108c SS |
210 | return NULL; |
211 | } | |
c906108c | 212 | \f |
c5aa993b | 213 | |
ccc57cf9 | 214 | /* Report a memory error by throwing a MEMORY_ERROR error. */ |
c906108c SS |
215 | |
216 | void | |
fba45db2 | 217 | memory_error (int status, CORE_ADDR memaddr) |
c906108c SS |
218 | { |
219 | if (status == EIO) | |
ccc57cf9 PA |
220 | /* Actually, address between memaddr and memaddr + len was out of |
221 | bounds. */ | |
222 | throw_error (MEMORY_ERROR, | |
223 | _("Cannot access memory at address %s"), | |
5af949e3 | 224 | paddress (target_gdbarch, memaddr)); |
c906108c | 225 | else |
ccc57cf9 PA |
226 | throw_error (MEMORY_ERROR, |
227 | _("Error accessing memory address %s: %s."), | |
5af949e3 | 228 | paddress (target_gdbarch, memaddr), |
ccc57cf9 | 229 | safe_strerror (status)); |
c906108c SS |
230 | } |
231 | ||
232 | /* Same as target_read_memory, but report an error if can't read. */ | |
4e5d721f | 233 | |
c906108c | 234 | void |
10c42a71 | 235 | read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len) |
c906108c SS |
236 | { |
237 | int status; | |
c5504eaf | 238 | |
c906108c SS |
239 | status = target_read_memory (memaddr, myaddr, len); |
240 | if (status != 0) | |
241 | memory_error (status, memaddr); | |
242 | } | |
243 | ||
4e5d721f DE |
244 | /* Same as target_read_stack, but report an error if can't read. */ |
245 | ||
246 | void | |
247 | read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, int len) | |
248 | { | |
249 | int status; | |
c5504eaf | 250 | |
4e5d721f DE |
251 | status = target_read_stack (memaddr, myaddr, len); |
252 | if (status != 0) | |
253 | memory_error (status, memaddr); | |
254 | } | |
255 | ||
ee8ff470 KB |
256 | /* Argument / return result struct for use with |
257 | do_captured_read_memory_integer(). MEMADDR and LEN are filled in | |
258 | by gdb_read_memory_integer(). RESULT is the contents that were | |
259 | successfully read from MEMADDR of length LEN. */ | |
c906108c | 260 | |
16a0f3e7 EZ |
261 | struct captured_read_memory_integer_arguments |
262 | { | |
263 | CORE_ADDR memaddr; | |
264 | int len; | |
e17a4113 | 265 | enum bfd_endian byte_order; |
16a0f3e7 EZ |
266 | LONGEST result; |
267 | }; | |
268 | ||
ee8ff470 | 269 | /* Helper function for gdb_read_memory_integer(). DATA must be a |
aff410f1 | 270 | pointer to a captured_read_memory_integer_arguments struct. |
ee8ff470 KB |
271 | Return 1 if successful. Note that the catch_errors() interface |
272 | will return 0 if an error occurred while reading memory. This | |
273 | choice of return code is so that we can distinguish between | |
274 | success and failure. */ | |
275 | ||
16a0f3e7 EZ |
276 | static int |
277 | do_captured_read_memory_integer (void *data) | |
278 | { | |
aff410f1 MS |
279 | struct captured_read_memory_integer_arguments *args |
280 | = (struct captured_read_memory_integer_arguments*) data; | |
16a0f3e7 EZ |
281 | CORE_ADDR memaddr = args->memaddr; |
282 | int len = args->len; | |
e17a4113 | 283 | enum bfd_endian byte_order = args->byte_order; |
16a0f3e7 | 284 | |
e17a4113 | 285 | args->result = read_memory_integer (memaddr, len, byte_order); |
16a0f3e7 | 286 | |
ee8ff470 | 287 | return 1; |
16a0f3e7 EZ |
288 | } |
289 | ||
ee8ff470 KB |
290 | /* Read memory at MEMADDR of length LEN and put the contents in |
291 | RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero | |
292 | if successful. */ | |
293 | ||
16a0f3e7 | 294 | int |
c5504eaf MS |
295 | safe_read_memory_integer (CORE_ADDR memaddr, int len, |
296 | enum bfd_endian byte_order, | |
e17a4113 | 297 | LONGEST *return_value) |
16a0f3e7 EZ |
298 | { |
299 | int status; | |
300 | struct captured_read_memory_integer_arguments args; | |
c5504eaf | 301 | |
16a0f3e7 EZ |
302 | args.memaddr = memaddr; |
303 | args.len = len; | |
e17a4113 | 304 | args.byte_order = byte_order; |
16a0f3e7 EZ |
305 | |
306 | status = catch_errors (do_captured_read_memory_integer, &args, | |
aff410f1 | 307 | "", RETURN_MASK_ALL); |
ee8ff470 | 308 | if (status) |
16a0f3e7 EZ |
309 | *return_value = args.result; |
310 | ||
311 | return status; | |
312 | } | |
313 | ||
c906108c | 314 | LONGEST |
aff410f1 MS |
315 | read_memory_integer (CORE_ADDR memaddr, int len, |
316 | enum bfd_endian byte_order) | |
c906108c | 317 | { |
dfb65433 | 318 | gdb_byte buf[sizeof (LONGEST)]; |
c906108c SS |
319 | |
320 | read_memory (memaddr, buf, len); | |
e17a4113 | 321 | return extract_signed_integer (buf, len, byte_order); |
c906108c SS |
322 | } |
323 | ||
324 | ULONGEST | |
aff410f1 MS |
325 | read_memory_unsigned_integer (CORE_ADDR memaddr, int len, |
326 | enum bfd_endian byte_order) | |
c906108c | 327 | { |
dfb65433 | 328 | gdb_byte buf[sizeof (ULONGEST)]; |
c906108c SS |
329 | |
330 | read_memory (memaddr, buf, len); | |
e17a4113 | 331 | return extract_unsigned_integer (buf, len, byte_order); |
c906108c SS |
332 | } |
333 | ||
334 | void | |
fba45db2 | 335 | read_memory_string (CORE_ADDR memaddr, char *buffer, int max_len) |
c906108c | 336 | { |
52f0bd74 AC |
337 | char *cp; |
338 | int i; | |
c906108c SS |
339 | int cnt; |
340 | ||
341 | cp = buffer; | |
342 | while (1) | |
343 | { | |
344 | if (cp - buffer >= max_len) | |
c5aa993b JM |
345 | { |
346 | buffer[max_len - 1] = '\0'; | |
347 | break; | |
348 | } | |
c906108c SS |
349 | cnt = max_len - (cp - buffer); |
350 | if (cnt > 8) | |
351 | cnt = 8; | |
352 | read_memory (memaddr + (int) (cp - buffer), cp, cnt); | |
353 | for (i = 0; i < cnt && *cp; i++, cp++) | |
c5aa993b | 354 | ; /* null body */ |
c906108c SS |
355 | |
356 | if (i < cnt && !*cp) | |
c5aa993b | 357 | break; |
c906108c SS |
358 | } |
359 | } | |
c26e4683 | 360 | |
0d540cdf KD |
361 | CORE_ADDR |
362 | read_memory_typed_address (CORE_ADDR addr, struct type *type) | |
363 | { | |
dfb65433 | 364 | gdb_byte *buf = alloca (TYPE_LENGTH (type)); |
c5504eaf | 365 | |
0d540cdf KD |
366 | read_memory (addr, buf, TYPE_LENGTH (type)); |
367 | return extract_typed_address (buf, type); | |
368 | } | |
369 | ||
aff410f1 MS |
370 | /* Same as target_write_memory, but report an error if can't |
371 | write. */ | |
c26e4683 | 372 | void |
aff410f1 MS |
373 | write_memory (CORE_ADDR memaddr, |
374 | const bfd_byte *myaddr, int len) | |
c26e4683 JB |
375 | { |
376 | int status; | |
c5504eaf | 377 | |
00630ca8 | 378 | status = target_write_memory (memaddr, myaddr, len); |
c26e4683 JB |
379 | if (status != 0) |
380 | memory_error (status, memaddr); | |
381 | } | |
382 | ||
aff410f1 MS |
383 | /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned |
384 | integer. */ | |
c26e4683 | 385 | void |
c5504eaf MS |
386 | write_memory_unsigned_integer (CORE_ADDR addr, int len, |
387 | enum bfd_endian byte_order, | |
e17a4113 | 388 | ULONGEST value) |
c26e4683 | 389 | { |
dfb65433 | 390 | gdb_byte *buf = alloca (len); |
c5504eaf | 391 | |
e17a4113 | 392 | store_unsigned_integer (buf, len, byte_order, value); |
c26e4683 JB |
393 | write_memory (addr, buf, len); |
394 | } | |
395 | ||
aff410f1 MS |
396 | /* Store VALUE at ADDR in the inferior as a LEN-byte signed |
397 | integer. */ | |
c26e4683 | 398 | void |
c5504eaf MS |
399 | write_memory_signed_integer (CORE_ADDR addr, int len, |
400 | enum bfd_endian byte_order, | |
e17a4113 | 401 | LONGEST value) |
c26e4683 | 402 | { |
dfb65433 | 403 | gdb_byte *buf = alloca (len); |
c5504eaf | 404 | |
e17a4113 | 405 | store_signed_integer (buf, len, byte_order, value); |
c26e4683 JB |
406 | write_memory (addr, buf, len); |
407 | } | |
c906108c SS |
408 | \f |
409 | /* The current default bfd target. Points to storage allocated for | |
410 | gnutarget_string. */ | |
411 | char *gnutarget; | |
412 | ||
413 | /* Same thing, except it is "auto" not NULL for the default case. */ | |
414 | static char *gnutarget_string; | |
920d2a44 AC |
415 | static void |
416 | show_gnutarget_string (struct ui_file *file, int from_tty, | |
aff410f1 MS |
417 | struct cmd_list_element *c, |
418 | const char *value) | |
920d2a44 | 419 | { |
aff410f1 MS |
420 | fprintf_filtered (file, |
421 | _("The current BFD target is \"%s\".\n"), value); | |
920d2a44 | 422 | } |
c906108c | 423 | |
aff410f1 MS |
424 | static void set_gnutarget_command (char *, int, |
425 | struct cmd_list_element *); | |
c906108c SS |
426 | |
427 | static void | |
aff410f1 MS |
428 | set_gnutarget_command (char *ignore, int from_tty, |
429 | struct cmd_list_element *c) | |
c906108c | 430 | { |
bde58177 | 431 | if (strcmp (gnutarget_string, "auto") == 0) |
c906108c SS |
432 | gnutarget = NULL; |
433 | else | |
434 | gnutarget = gnutarget_string; | |
435 | } | |
436 | ||
437 | /* Set the gnutarget. */ | |
438 | void | |
fba45db2 | 439 | set_gnutarget (char *newtarget) |
c906108c SS |
440 | { |
441 | if (gnutarget_string != NULL) | |
b8c9b27d | 442 | xfree (gnutarget_string); |
1b36a34b | 443 | gnutarget_string = xstrdup (newtarget); |
c906108c SS |
444 | set_gnutarget_command (NULL, 0, NULL); |
445 | } | |
446 | ||
447 | void | |
fba45db2 | 448 | _initialize_core (void) |
c906108c SS |
449 | { |
450 | struct cmd_list_element *c; | |
c5504eaf | 451 | |
1a966eab AC |
452 | c = add_cmd ("core-file", class_files, core_file_command, _("\ |
453 | Use FILE as core dump for examining memory and registers.\n\ | |
c906108c | 454 | No arg means have no core file. This command has been superseded by the\n\ |
1a966eab | 455 | `target core' and `detach' commands."), &cmdlist); |
5ba2abeb | 456 | set_cmd_completer (c, filename_completer); |
c906108c | 457 | |
26c41df3 AC |
458 | |
459 | add_setshow_string_noescape_cmd ("gnutarget", class_files, | |
f1648876 | 460 | &gnutarget_string, _("\ |
26c41df3 AC |
461 | Set the current BFD target."), _("\ |
462 | Show the current BFD target."), _("\ | |
463 | Use `set gnutarget auto' to specify automatic detection."), | |
464 | set_gnutarget_command, | |
920d2a44 | 465 | show_gnutarget_string, |
26c41df3 | 466 | &setlist, &showlist); |
c906108c SS |
467 | |
468 | if (getenv ("GNUTARGET")) | |
469 | set_gnutarget (getenv ("GNUTARGET")); | |
470 | else | |
471 | set_gnutarget ("auto"); | |
472 | } |