Commit | Line | Data |
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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 | ||
c906108c | 135 | void |
fba45db2 | 136 | reopen_exec_file (void) |
c906108c | 137 | { |
c906108c SS |
138 | char *filename; |
139 | int res; | |
140 | struct stat st; | |
f7545552 | 141 | struct cleanup *cleanups; |
c906108c | 142 | |
aff410f1 | 143 | /* Don't do anything if there isn't an exec file. */ |
4c42eaff | 144 | if (exec_bfd == NULL) |
c906108c | 145 | return; |
c5aa993b | 146 | |
aff410f1 | 147 | /* If the timestamp of the exec file has changed, reopen it. */ |
c2d11a7d | 148 | filename = xstrdup (bfd_get_filename (exec_bfd)); |
f7545552 | 149 | cleanups = make_cleanup (xfree, filename); |
c906108c SS |
150 | res = stat (filename, &st); |
151 | ||
c04ea773 | 152 | if (exec_bfd_mtime && exec_bfd_mtime != st.st_mtime) |
4c42eaff | 153 | exec_file_attach (filename, 0); |
939643d7 DJ |
154 | else |
155 | /* If we accessed the file since last opening it, close it now; | |
156 | this stops GDB from holding the executable open after it | |
157 | exits. */ | |
158 | bfd_cache_close_all (); | |
f7545552 TT |
159 | |
160 | do_cleanups (cleanups); | |
c906108c SS |
161 | } |
162 | \f | |
163 | /* If we have both a core file and an exec file, | |
164 | print a warning if they don't go together. */ | |
165 | ||
166 | void | |
fba45db2 | 167 | validate_files (void) |
c906108c SS |
168 | { |
169 | if (exec_bfd && core_bfd) | |
170 | { | |
171 | if (!core_file_matches_executable_p (core_bfd, exec_bfd)) | |
8a3fe4f8 | 172 | warning (_("core file may not match specified executable file.")); |
c5aa993b | 173 | else if (bfd_get_mtime (exec_bfd) > bfd_get_mtime (core_bfd)) |
8a3fe4f8 | 174 | warning (_("exec file is newer than core file.")); |
c906108c SS |
175 | } |
176 | } | |
177 | ||
178 | /* Return the name of the executable file as a string. | |
179 | ERR nonzero means get error if there is none specified; | |
180 | otherwise return 0 in that case. */ | |
181 | ||
182 | char * | |
fba45db2 | 183 | get_exec_file (int err) |
c906108c | 184 | { |
c5aa993b JM |
185 | if (exec_bfd) |
186 | return bfd_get_filename (exec_bfd); | |
187 | if (!err) | |
188 | return NULL; | |
c906108c | 189 | |
8a3fe4f8 AC |
190 | error (_("No executable file specified.\n\ |
191 | Use the \"file\" or \"exec-file\" command.")); | |
c906108c SS |
192 | return NULL; |
193 | } | |
c906108c | 194 | \f |
c5aa993b | 195 | |
ccc57cf9 | 196 | /* Report a memory error by throwing a MEMORY_ERROR error. */ |
c906108c SS |
197 | |
198 | void | |
fba45db2 | 199 | memory_error (int status, CORE_ADDR memaddr) |
c906108c SS |
200 | { |
201 | if (status == EIO) | |
ccc57cf9 PA |
202 | /* Actually, address between memaddr and memaddr + len was out of |
203 | bounds. */ | |
204 | throw_error (MEMORY_ERROR, | |
205 | _("Cannot access memory at address %s"), | |
5af949e3 | 206 | paddress (target_gdbarch, memaddr)); |
c906108c | 207 | else |
ccc57cf9 PA |
208 | throw_error (MEMORY_ERROR, |
209 | _("Error accessing memory address %s: %s."), | |
5af949e3 | 210 | paddress (target_gdbarch, memaddr), |
ccc57cf9 | 211 | safe_strerror (status)); |
c906108c SS |
212 | } |
213 | ||
214 | /* Same as target_read_memory, but report an error if can't read. */ | |
4e5d721f | 215 | |
c906108c | 216 | void |
10c42a71 | 217 | read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len) |
c906108c SS |
218 | { |
219 | int status; | |
c5504eaf | 220 | |
c906108c SS |
221 | status = target_read_memory (memaddr, myaddr, len); |
222 | if (status != 0) | |
223 | memory_error (status, memaddr); | |
224 | } | |
225 | ||
4e5d721f DE |
226 | /* Same as target_read_stack, but report an error if can't read. */ |
227 | ||
228 | void | |
229 | read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, int len) | |
230 | { | |
231 | int status; | |
c5504eaf | 232 | |
4e5d721f DE |
233 | status = target_read_stack (memaddr, myaddr, len); |
234 | if (status != 0) | |
235 | memory_error (status, memaddr); | |
236 | } | |
237 | ||
ee8ff470 KB |
238 | /* Argument / return result struct for use with |
239 | do_captured_read_memory_integer(). MEMADDR and LEN are filled in | |
240 | by gdb_read_memory_integer(). RESULT is the contents that were | |
241 | successfully read from MEMADDR of length LEN. */ | |
c906108c | 242 | |
16a0f3e7 EZ |
243 | struct captured_read_memory_integer_arguments |
244 | { | |
245 | CORE_ADDR memaddr; | |
246 | int len; | |
e17a4113 | 247 | enum bfd_endian byte_order; |
16a0f3e7 EZ |
248 | LONGEST result; |
249 | }; | |
250 | ||
ee8ff470 | 251 | /* Helper function for gdb_read_memory_integer(). DATA must be a |
aff410f1 | 252 | pointer to a captured_read_memory_integer_arguments struct. |
ee8ff470 KB |
253 | Return 1 if successful. Note that the catch_errors() interface |
254 | will return 0 if an error occurred while reading memory. This | |
255 | choice of return code is so that we can distinguish between | |
256 | success and failure. */ | |
257 | ||
16a0f3e7 EZ |
258 | static int |
259 | do_captured_read_memory_integer (void *data) | |
260 | { | |
aff410f1 MS |
261 | struct captured_read_memory_integer_arguments *args |
262 | = (struct captured_read_memory_integer_arguments*) data; | |
16a0f3e7 EZ |
263 | CORE_ADDR memaddr = args->memaddr; |
264 | int len = args->len; | |
e17a4113 | 265 | enum bfd_endian byte_order = args->byte_order; |
16a0f3e7 | 266 | |
e17a4113 | 267 | args->result = read_memory_integer (memaddr, len, byte_order); |
16a0f3e7 | 268 | |
ee8ff470 | 269 | return 1; |
16a0f3e7 EZ |
270 | } |
271 | ||
ee8ff470 KB |
272 | /* Read memory at MEMADDR of length LEN and put the contents in |
273 | RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero | |
274 | if successful. */ | |
275 | ||
16a0f3e7 | 276 | int |
c5504eaf MS |
277 | safe_read_memory_integer (CORE_ADDR memaddr, int len, |
278 | enum bfd_endian byte_order, | |
e17a4113 | 279 | LONGEST *return_value) |
16a0f3e7 EZ |
280 | { |
281 | int status; | |
282 | struct captured_read_memory_integer_arguments args; | |
c5504eaf | 283 | |
16a0f3e7 EZ |
284 | args.memaddr = memaddr; |
285 | args.len = len; | |
e17a4113 | 286 | args.byte_order = byte_order; |
16a0f3e7 EZ |
287 | |
288 | status = catch_errors (do_captured_read_memory_integer, &args, | |
aff410f1 | 289 | "", RETURN_MASK_ALL); |
ee8ff470 | 290 | if (status) |
16a0f3e7 EZ |
291 | *return_value = args.result; |
292 | ||
293 | return status; | |
294 | } | |
295 | ||
c906108c | 296 | LONGEST |
aff410f1 MS |
297 | read_memory_integer (CORE_ADDR memaddr, int len, |
298 | enum bfd_endian byte_order) | |
c906108c | 299 | { |
dfb65433 | 300 | gdb_byte buf[sizeof (LONGEST)]; |
c906108c SS |
301 | |
302 | read_memory (memaddr, buf, len); | |
e17a4113 | 303 | return extract_signed_integer (buf, len, byte_order); |
c906108c SS |
304 | } |
305 | ||
306 | ULONGEST | |
aff410f1 MS |
307 | read_memory_unsigned_integer (CORE_ADDR memaddr, int len, |
308 | enum bfd_endian byte_order) | |
c906108c | 309 | { |
dfb65433 | 310 | gdb_byte buf[sizeof (ULONGEST)]; |
c906108c SS |
311 | |
312 | read_memory (memaddr, buf, len); | |
e17a4113 | 313 | return extract_unsigned_integer (buf, len, byte_order); |
c906108c SS |
314 | } |
315 | ||
316 | void | |
fba45db2 | 317 | read_memory_string (CORE_ADDR memaddr, char *buffer, int max_len) |
c906108c | 318 | { |
52f0bd74 AC |
319 | char *cp; |
320 | int i; | |
c906108c SS |
321 | int cnt; |
322 | ||
323 | cp = buffer; | |
324 | while (1) | |
325 | { | |
326 | if (cp - buffer >= max_len) | |
c5aa993b JM |
327 | { |
328 | buffer[max_len - 1] = '\0'; | |
329 | break; | |
330 | } | |
c906108c SS |
331 | cnt = max_len - (cp - buffer); |
332 | if (cnt > 8) | |
333 | cnt = 8; | |
334 | read_memory (memaddr + (int) (cp - buffer), cp, cnt); | |
335 | for (i = 0; i < cnt && *cp; i++, cp++) | |
c5aa993b | 336 | ; /* null body */ |
c906108c SS |
337 | |
338 | if (i < cnt && !*cp) | |
c5aa993b | 339 | break; |
c906108c SS |
340 | } |
341 | } | |
c26e4683 | 342 | |
0d540cdf KD |
343 | CORE_ADDR |
344 | read_memory_typed_address (CORE_ADDR addr, struct type *type) | |
345 | { | |
dfb65433 | 346 | gdb_byte *buf = alloca (TYPE_LENGTH (type)); |
c5504eaf | 347 | |
0d540cdf KD |
348 | read_memory (addr, buf, TYPE_LENGTH (type)); |
349 | return extract_typed_address (buf, type); | |
350 | } | |
351 | ||
aff410f1 MS |
352 | /* Same as target_write_memory, but report an error if can't |
353 | write. */ | |
c26e4683 | 354 | void |
aff410f1 MS |
355 | write_memory (CORE_ADDR memaddr, |
356 | const bfd_byte *myaddr, int len) | |
c26e4683 JB |
357 | { |
358 | int status; | |
c5504eaf | 359 | |
00630ca8 | 360 | status = target_write_memory (memaddr, myaddr, len); |
c26e4683 JB |
361 | if (status != 0) |
362 | memory_error (status, memaddr); | |
363 | } | |
364 | ||
aff410f1 MS |
365 | /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned |
366 | integer. */ | |
c26e4683 | 367 | void |
c5504eaf MS |
368 | write_memory_unsigned_integer (CORE_ADDR addr, int len, |
369 | enum bfd_endian byte_order, | |
e17a4113 | 370 | ULONGEST value) |
c26e4683 | 371 | { |
dfb65433 | 372 | gdb_byte *buf = alloca (len); |
c5504eaf | 373 | |
e17a4113 | 374 | store_unsigned_integer (buf, len, byte_order, value); |
c26e4683 JB |
375 | write_memory (addr, buf, len); |
376 | } | |
377 | ||
aff410f1 MS |
378 | /* Store VALUE at ADDR in the inferior as a LEN-byte signed |
379 | integer. */ | |
c26e4683 | 380 | void |
c5504eaf MS |
381 | write_memory_signed_integer (CORE_ADDR addr, int len, |
382 | enum bfd_endian byte_order, | |
e17a4113 | 383 | LONGEST value) |
c26e4683 | 384 | { |
dfb65433 | 385 | gdb_byte *buf = alloca (len); |
c5504eaf | 386 | |
e17a4113 | 387 | store_signed_integer (buf, len, byte_order, value); |
c26e4683 JB |
388 | write_memory (addr, buf, len); |
389 | } | |
c906108c SS |
390 | \f |
391 | /* The current default bfd target. Points to storage allocated for | |
392 | gnutarget_string. */ | |
393 | char *gnutarget; | |
394 | ||
395 | /* Same thing, except it is "auto" not NULL for the default case. */ | |
396 | static char *gnutarget_string; | |
920d2a44 AC |
397 | static void |
398 | show_gnutarget_string (struct ui_file *file, int from_tty, | |
aff410f1 MS |
399 | struct cmd_list_element *c, |
400 | const char *value) | |
920d2a44 | 401 | { |
aff410f1 MS |
402 | fprintf_filtered (file, |
403 | _("The current BFD target is \"%s\".\n"), value); | |
920d2a44 | 404 | } |
c906108c | 405 | |
aff410f1 MS |
406 | static void set_gnutarget_command (char *, int, |
407 | struct cmd_list_element *); | |
c906108c SS |
408 | |
409 | static void | |
aff410f1 MS |
410 | set_gnutarget_command (char *ignore, int from_tty, |
411 | struct cmd_list_element *c) | |
c906108c | 412 | { |
bde58177 | 413 | if (strcmp (gnutarget_string, "auto") == 0) |
c906108c SS |
414 | gnutarget = NULL; |
415 | else | |
416 | gnutarget = gnutarget_string; | |
417 | } | |
418 | ||
419 | /* Set the gnutarget. */ | |
420 | void | |
fba45db2 | 421 | set_gnutarget (char *newtarget) |
c906108c SS |
422 | { |
423 | if (gnutarget_string != NULL) | |
b8c9b27d | 424 | xfree (gnutarget_string); |
1b36a34b | 425 | gnutarget_string = xstrdup (newtarget); |
c906108c SS |
426 | set_gnutarget_command (NULL, 0, NULL); |
427 | } | |
428 | ||
429 | void | |
fba45db2 | 430 | _initialize_core (void) |
c906108c SS |
431 | { |
432 | struct cmd_list_element *c; | |
c5504eaf | 433 | |
1a966eab AC |
434 | c = add_cmd ("core-file", class_files, core_file_command, _("\ |
435 | Use FILE as core dump for examining memory and registers.\n\ | |
c906108c | 436 | No arg means have no core file. This command has been superseded by the\n\ |
1a966eab | 437 | `target core' and `detach' commands."), &cmdlist); |
5ba2abeb | 438 | set_cmd_completer (c, filename_completer); |
c906108c | 439 | |
26c41df3 AC |
440 | |
441 | add_setshow_string_noescape_cmd ("gnutarget", class_files, | |
f1648876 | 442 | &gnutarget_string, _("\ |
26c41df3 AC |
443 | Set the current BFD target."), _("\ |
444 | Show the current BFD target."), _("\ | |
445 | Use `set gnutarget auto' to specify automatic detection."), | |
446 | set_gnutarget_command, | |
920d2a44 | 447 | show_gnutarget_string, |
26c41df3 | 448 | &setlist, &showlist); |
c906108c SS |
449 | |
450 | if (getenv ("GNUTARGET")) | |
451 | set_gnutarget (getenv ("GNUTARGET")); | |
452 | else | |
453 | set_gnutarget ("auto"); | |
454 | } |