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c906108c SS |
1 | /* Core dump and executable file functions above target vector, for GDB. |
2 | Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994 | |
3 | Free Software Foundation, Inc. | |
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 | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "defs.h" | |
22 | #include "gdb_string.h" | |
23 | #include <errno.h> | |
24 | #include <signal.h> | |
25 | #include <fcntl.h> | |
26 | #include "frame.h" /* required by inferior.h */ | |
27 | #include "inferior.h" | |
28 | #include "symtab.h" | |
29 | #include "command.h" | |
30 | #include "gdbcmd.h" | |
31 | #include "bfd.h" | |
32 | #include "target.h" | |
33 | #include "gdbcore.h" | |
34 | #include "dis-asm.h" | |
35 | #include "language.h" | |
36 | #include "gdb_stat.h" | |
37 | #include "symfile.h" | |
38 | #include "objfiles.h" | |
39 | ||
c906108c SS |
40 | /* Local function declarations. */ |
41 | ||
392a587b | 42 | extern void _initialize_core PARAMS ((void)); |
c906108c SS |
43 | static void call_extra_exec_file_hooks PARAMS ((char *filename)); |
44 | ||
45 | /* You can have any number of hooks for `exec_file_command' command to call. | |
46 | If there's only one hook, it is set in exec_file_display hook. | |
47 | If there are two or more hooks, they are set in exec_file_extra_hooks[], | |
48 | and exec_file_display_hook is set to a function that calls all of them. | |
49 | This extra complexity is needed to preserve compatibility with | |
50 | old code that assumed that only one hook could be set, and which called | |
51 | exec_file_display_hook directly. */ | |
52 | ||
53 | typedef void (*hook_type) PARAMS ((char *)); | |
54 | ||
55 | hook_type exec_file_display_hook; /* the original hook */ | |
56 | static hook_type *exec_file_extra_hooks; /* array of additional hooks */ | |
57 | static int exec_file_hook_count = 0; /* size of array */ | |
58 | ||
59 | /* Binary file diddling handle for the core file. */ | |
60 | ||
61 | bfd *core_bfd = NULL; | |
62 | ||
63 | \f | |
64 | /* Backward compatability with old way of specifying core files. */ | |
65 | ||
66 | void | |
67 | core_file_command (filename, from_tty) | |
68 | char *filename; | |
69 | int from_tty; | |
70 | { | |
71 | struct target_ops *t; | |
72 | ||
73 | dont_repeat (); /* Either way, seems bogus. */ | |
74 | ||
75 | t = find_core_target (); | |
76 | if (t != NULL) | |
77 | if (!filename) | |
78 | (t->to_detach) (filename, from_tty); | |
79 | else | |
80 | { | |
81 | /* Yes, we were given the path of a core file. Do we already | |
82 | have a symbol file? If not, can we determine it from the | |
83 | core file? If we can, do so. | |
84 | */ | |
85 | #ifdef HPUXHPPA | |
86 | if (symfile_objfile == NULL) | |
87 | { | |
88 | char * symfile; | |
89 | symfile = t->to_core_file_to_sym_file (filename); | |
90 | if (symfile) | |
91 | { | |
92 | char * symfile_copy = strdup (symfile); | |
93 | ||
94 | make_cleanup (free, symfile_copy); | |
95 | symbol_file_command (symfile_copy, from_tty); | |
96 | } | |
97 | else | |
98 | warning ("Unknown symbols for '%s'; use the 'symbol-file' command.", filename); | |
99 | } | |
100 | #endif | |
101 | (t->to_open) (filename, from_tty); | |
102 | } | |
103 | else | |
104 | error ("GDB can't read core files on this machine."); | |
105 | } | |
106 | ||
107 | \f | |
108 | /* If there are two or more functions that wish to hook into exec_file_command, | |
109 | * this function will call all of the hook functions. */ | |
110 | ||
111 | static void | |
112 | call_extra_exec_file_hooks (filename) | |
113 | char *filename; | |
114 | { | |
115 | int i; | |
116 | ||
117 | for (i = 0; i < exec_file_hook_count; i++) | |
118 | (*exec_file_extra_hooks[i])(filename); | |
119 | } | |
120 | ||
121 | /* Call this to specify the hook for exec_file_command to call back. | |
122 | This is called from the x-window display code. */ | |
123 | ||
124 | void | |
125 | specify_exec_file_hook (hook) | |
126 | void (*hook) PARAMS ((char *)); | |
127 | { | |
128 | hook_type *new_array; | |
129 | ||
130 | if (exec_file_display_hook != NULL) | |
131 | { | |
132 | /* There's already a hook installed. Arrange to have both it | |
133 | * and the subsequent hooks called. */ | |
134 | if (exec_file_hook_count == 0) | |
135 | { | |
136 | /* If this is the first extra hook, initialize the hook array. */ | |
137 | exec_file_extra_hooks = (hook_type *) xmalloc (sizeof(hook_type)); | |
138 | exec_file_extra_hooks[0] = exec_file_display_hook; | |
139 | exec_file_display_hook = call_extra_exec_file_hooks; | |
140 | exec_file_hook_count = 1; | |
141 | } | |
142 | ||
143 | /* Grow the hook array by one and add the new hook to the end. | |
144 | Yes, it's inefficient to grow it by one each time but since | |
145 | this is hardly ever called it's not a big deal. */ | |
146 | exec_file_hook_count++; | |
147 | new_array = | |
148 | (hook_type *) xrealloc (exec_file_extra_hooks, | |
149 | exec_file_hook_count * sizeof(hook_type)); | |
150 | exec_file_extra_hooks = new_array; | |
151 | exec_file_extra_hooks[exec_file_hook_count - 1] = hook; | |
152 | } | |
153 | else | |
154 | exec_file_display_hook = hook; | |
155 | } | |
156 | ||
157 | /* The exec file must be closed before running an inferior. | |
158 | If it is needed again after the inferior dies, it must | |
159 | be reopened. */ | |
160 | ||
161 | void | |
162 | close_exec_file () | |
163 | { | |
164 | #if 0 /* FIXME */ | |
165 | if (exec_bfd) | |
166 | bfd_tempclose (exec_bfd); | |
167 | #endif | |
168 | } | |
169 | ||
170 | void | |
171 | reopen_exec_file () | |
172 | { | |
173 | #if 0 /* FIXME */ | |
174 | if (exec_bfd) | |
175 | bfd_reopen (exec_bfd); | |
176 | #else | |
177 | char *filename; | |
178 | int res; | |
179 | struct stat st; | |
180 | long mtime; | |
181 | ||
182 | /* Don't do anything if the current target isn't exec. */ | |
183 | if (exec_bfd == NULL || strcmp (target_shortname, "exec") != 0) | |
184 | return; | |
185 | ||
186 | /* If the timestamp of the exec file has changed, reopen it. */ | |
187 | filename = strdup (bfd_get_filename (exec_bfd)); | |
188 | make_cleanup (free, filename); | |
189 | mtime = bfd_get_mtime(exec_bfd); | |
190 | res = stat (filename, &st); | |
191 | ||
192 | if (mtime && mtime != st.st_mtime) | |
193 | exec_file_command (filename, 0); | |
194 | #endif | |
195 | } | |
196 | \f | |
197 | /* If we have both a core file and an exec file, | |
198 | print a warning if they don't go together. */ | |
199 | ||
200 | void | |
201 | validate_files () | |
202 | { | |
203 | if (exec_bfd && core_bfd) | |
204 | { | |
205 | if (!core_file_matches_executable_p (core_bfd, exec_bfd)) | |
206 | warning ("core file may not match specified executable file."); | |
207 | else if (bfd_get_mtime(exec_bfd) > bfd_get_mtime(core_bfd)) | |
208 | warning ("exec file is newer than core file."); | |
209 | } | |
210 | } | |
211 | ||
212 | /* Return the name of the executable file as a string. | |
213 | ERR nonzero means get error if there is none specified; | |
214 | otherwise return 0 in that case. */ | |
215 | ||
216 | char * | |
217 | get_exec_file (err) | |
218 | int err; | |
219 | { | |
220 | if (exec_bfd) return bfd_get_filename(exec_bfd); | |
221 | if (!err) return NULL; | |
222 | ||
223 | error ("No executable file specified.\n\ | |
224 | Use the \"file\" or \"exec-file\" command."); | |
225 | return NULL; | |
226 | } | |
227 | ||
228 | \f | |
229 | /* Report a memory error with error(). */ | |
230 | ||
231 | void | |
232 | memory_error (status, memaddr) | |
233 | int status; | |
234 | CORE_ADDR memaddr; | |
235 | { | |
236 | if (status == EIO) | |
237 | { | |
238 | /* Actually, address between memaddr and memaddr + len | |
239 | was out of bounds. */ | |
240 | error_begin (); | |
241 | printf_filtered ("Cannot access memory at address "); | |
242 | print_address_numeric (memaddr, 1, gdb_stdout); | |
243 | printf_filtered (".\n"); | |
244 | return_to_top_level (RETURN_ERROR); | |
245 | } | |
246 | else | |
247 | { | |
248 | error_begin (); | |
249 | printf_filtered ("Error accessing memory address "); | |
250 | print_address_numeric (memaddr, 1, gdb_stdout); | |
251 | printf_filtered (": %s.\n", | |
252 | safe_strerror (status)); | |
253 | return_to_top_level (RETURN_ERROR); | |
254 | } | |
255 | } | |
256 | ||
257 | /* Same as target_read_memory, but report an error if can't read. */ | |
258 | void | |
259 | read_memory (memaddr, myaddr, len) | |
260 | CORE_ADDR memaddr; | |
261 | char *myaddr; | |
262 | int len; | |
263 | { | |
264 | int status; | |
265 | status = target_read_memory (memaddr, myaddr, len); | |
266 | if (status != 0) | |
267 | memory_error (status, memaddr); | |
268 | } | |
269 | ||
270 | void | |
271 | read_memory_section (memaddr, myaddr, len, bfd_section) | |
272 | CORE_ADDR memaddr; | |
273 | char *myaddr; | |
274 | int len; | |
275 | asection *bfd_section; | |
276 | { | |
277 | int status; | |
278 | status = target_read_memory_section (memaddr, myaddr, len, bfd_section); | |
279 | if (status != 0) | |
280 | memory_error (status, memaddr); | |
281 | } | |
282 | ||
283 | /* Like target_read_memory, but slightly different parameters. */ | |
284 | ||
285 | int | |
286 | dis_asm_read_memory (memaddr, myaddr, len, info) | |
287 | bfd_vma memaddr; | |
288 | bfd_byte *myaddr; | |
289 | int len; | |
290 | disassemble_info *info; | |
291 | { | |
292 | return target_read_memory (memaddr, (char *) myaddr, len); | |
293 | } | |
294 | ||
295 | /* Like memory_error with slightly different parameters. */ | |
296 | void | |
297 | dis_asm_memory_error (status, memaddr, info) | |
298 | int status; | |
299 | bfd_vma memaddr; | |
300 | disassemble_info *info; | |
301 | { | |
302 | memory_error (status, memaddr); | |
303 | } | |
304 | ||
305 | /* Like print_address with slightly different parameters. */ | |
306 | void | |
307 | dis_asm_print_address (addr, info) | |
308 | bfd_vma addr; | |
309 | struct disassemble_info *info; | |
310 | { | |
311 | print_address (addr, info->stream); | |
312 | } | |
313 | ||
314 | /* Same as target_write_memory, but report an error if can't write. */ | |
315 | void | |
316 | write_memory (memaddr, myaddr, len) | |
317 | CORE_ADDR memaddr; | |
318 | char *myaddr; | |
319 | int len; | |
320 | { | |
321 | int status; | |
322 | ||
323 | status = target_write_memory (memaddr, myaddr, len); | |
324 | if (status != 0) | |
325 | memory_error (status, memaddr); | |
326 | } | |
327 | ||
328 | /* Read an integer from debugged memory, given address and number of bytes. */ | |
329 | ||
330 | LONGEST | |
331 | read_memory_integer (memaddr, len) | |
332 | CORE_ADDR memaddr; | |
333 | int len; | |
334 | { | |
335 | char buf[sizeof (LONGEST)]; | |
336 | ||
337 | read_memory (memaddr, buf, len); | |
338 | return extract_signed_integer (buf, len); | |
339 | } | |
340 | ||
341 | ULONGEST | |
342 | read_memory_unsigned_integer (memaddr, len) | |
343 | CORE_ADDR memaddr; | |
344 | int len; | |
345 | { | |
346 | char buf[sizeof (ULONGEST)]; | |
347 | ||
348 | read_memory (memaddr, buf, len); | |
349 | return extract_unsigned_integer (buf, len); | |
350 | } | |
351 | ||
352 | void | |
353 | read_memory_string (memaddr, buffer, max_len) | |
354 | CORE_ADDR memaddr; | |
355 | char * buffer; | |
356 | int max_len; | |
357 | { | |
358 | register char * cp; | |
359 | register int i; | |
360 | int cnt; | |
361 | ||
362 | cp = buffer; | |
363 | while (1) | |
364 | { | |
365 | if (cp - buffer >= max_len) | |
366 | { | |
367 | buffer[max_len - 1] = '\0'; | |
368 | break; | |
369 | } | |
370 | cnt = max_len - (cp - buffer); | |
371 | if (cnt > 8) | |
372 | cnt = 8; | |
373 | read_memory (memaddr + (int) (cp - buffer), cp, cnt); | |
374 | for (i = 0; i < cnt && *cp; i++, cp++) | |
375 | ; /* null body */ | |
376 | ||
377 | if (i < cnt && !*cp) | |
378 | break; | |
379 | } | |
380 | } | |
381 | ||
382 | \f | |
383 | #if 0 | |
384 | /* Enable after 4.12. It is not tested. */ | |
385 | ||
386 | /* Search code. Targets can just make this their search function, or | |
387 | if the protocol has a less general search function, they can call this | |
388 | in the cases it can't handle. */ | |
389 | void | |
390 | generic_search (len, data, mask, startaddr, increment, lorange, hirange | |
391 | addr_found, data_found) | |
392 | int len; | |
393 | char *data; | |
394 | char *mask; | |
395 | CORE_ADDR startaddr; | |
396 | int increment; | |
397 | CORE_ADDR lorange; | |
398 | CORE_ADDR hirange; | |
399 | CORE_ADDR *addr_found; | |
400 | char *data_found; | |
401 | { | |
402 | int i; | |
403 | CORE_ADDR curaddr = startaddr; | |
404 | ||
405 | while (curaddr >= lorange && curaddr < hirange) | |
406 | { | |
407 | read_memory (curaddr, data_found, len); | |
408 | for (i = 0; i < len; ++i) | |
409 | if ((data_found[i] & mask[i]) != data[i]) | |
410 | goto try_again; | |
411 | /* It matches. */ | |
412 | *addr_found = curaddr; | |
413 | return; | |
414 | ||
415 | try_again: | |
416 | curaddr += increment; | |
417 | } | |
418 | *addr_found = (CORE_ADDR)0; | |
419 | return; | |
420 | } | |
421 | #endif /* 0 */ | |
422 | \f | |
423 | /* The current default bfd target. Points to storage allocated for | |
424 | gnutarget_string. */ | |
425 | char *gnutarget; | |
426 | ||
427 | /* Same thing, except it is "auto" not NULL for the default case. */ | |
428 | static char *gnutarget_string; | |
429 | ||
430 | static void set_gnutarget_command | |
431 | PARAMS ((char *, int, struct cmd_list_element *)); | |
432 | ||
433 | static void | |
434 | set_gnutarget_command (ignore, from_tty, c) | |
435 | char *ignore; | |
436 | int from_tty; | |
437 | struct cmd_list_element *c; | |
438 | { | |
439 | if (STREQ (gnutarget_string, "auto")) | |
440 | gnutarget = NULL; | |
441 | else | |
442 | gnutarget = gnutarget_string; | |
443 | } | |
444 | ||
445 | /* Set the gnutarget. */ | |
446 | void | |
447 | set_gnutarget (newtarget) | |
448 | char *newtarget; | |
449 | { | |
450 | if (gnutarget_string != NULL) | |
451 | free (gnutarget_string); | |
452 | gnutarget_string = savestring (newtarget, strlen (newtarget)); | |
453 | set_gnutarget_command (NULL, 0, NULL); | |
454 | } | |
455 | ||
456 | void | |
457 | _initialize_core() | |
458 | { | |
459 | struct cmd_list_element *c; | |
460 | c = add_cmd ("core-file", class_files, core_file_command, | |
461 | "Use FILE as core dump for examining memory and registers.\n\ | |
462 | No arg means have no core file. This command has been superseded by the\n\ | |
463 | `target core' and `detach' commands.", &cmdlist); | |
464 | c->completer = filename_completer; | |
465 | ||
466 | c = add_set_cmd ("gnutarget", class_files, var_string_noescape, | |
467 | (char *) &gnutarget_string, | |
468 | "Set the current BFD target.\n\ | |
469 | Use `set gnutarget auto' to specify automatic detection.", | |
470 | &setlist); | |
471 | c->function.sfunc = set_gnutarget_command; | |
472 | add_show_from_set (c, &showlist); | |
473 | ||
474 | if (getenv ("GNUTARGET")) | |
475 | set_gnutarget (getenv ("GNUTARGET")); | |
476 | else | |
477 | set_gnutarget ("auto"); | |
478 | } |