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