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dd3b648e RP |
1 | /* Work with core dump and executable files, for GDB. |
2 | Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | GDB is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 1, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GDB is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GDB; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include <stdio.h> | |
21 | #include <errno.h> | |
22 | #include <signal.h> | |
23 | #include "defs.h" | |
24 | #include "param.h" | |
25 | #include "frame.h" /* required by inferior.h */ | |
26 | #include "inferior.h" | |
27 | #include "symtab.h" | |
28 | #include "command.h" | |
29 | #include "bfd.h" | |
30 | #include "target.h" | |
31 | #include "gdbcore.h" | |
32 | ||
33 | extern int xfer_memory (); | |
34 | extern void child_attach (), child_create_inferior (); | |
35 | ||
36 | extern int sys_nerr; | |
37 | extern char *sys_errlist[]; | |
38 | extern char *sys_siglist[]; | |
39 | ||
40 | extern char registers[]; | |
41 | ||
42 | /* Hook for `exec_file_command' command to call. */ | |
43 | ||
44 | void (*exec_file_display_hook) () = NULL; | |
45 | ||
46 | struct section_table *core_sections, *core_sections_end; | |
47 | ||
48 | /* Binary file diddling handle for the core file. */ | |
49 | ||
50 | bfd *core_bfd = NULL; | |
51 | ||
52 | /* Forward decl */ | |
53 | extern struct target_ops core_ops; | |
54 | ||
55 | \f | |
56 | /* Discard all vestiges of any previous core file | |
57 | and mark data and stack spaces as empty. */ | |
58 | ||
59 | void | |
60 | core_close (quitting) | |
61 | int quitting; | |
62 | { | |
63 | if (core_bfd) { | |
64 | free (bfd_get_filename (core_bfd)); | |
65 | bfd_close (core_bfd); | |
66 | core_bfd = NULL; | |
67 | } | |
68 | } | |
69 | ||
70 | /* This routine opens and sets up the core file bfd */ | |
71 | ||
72 | void | |
73 | core_open (filename, from_tty) | |
74 | char *filename; | |
75 | int from_tty; | |
76 | { | |
77 | char *p; | |
78 | int siggy; | |
79 | struct cleanup *old_chain; | |
80 | char *temp; | |
81 | bfd *temp_bfd; | |
82 | int ontop; | |
83 | ||
84 | if (!filename) | |
85 | { | |
86 | error (core_bfd? | |
87 | "No core file specified. (Use `detach' to stop debugging a core file.)" | |
88 | : "No core file specified."); | |
89 | } | |
90 | ||
91 | filename = tilde_expand (filename); | |
92 | if (filename[0] != '/') { | |
93 | temp = concat (current_directory, "/", filename); | |
94 | free (filename); | |
95 | filename = temp; | |
96 | } | |
97 | ||
98 | old_chain = make_cleanup (free, filename); | |
99 | temp_bfd = bfd_openr (filename, NULL); | |
100 | if (temp_bfd == NULL) | |
101 | { | |
102 | perror_with_name (filename); | |
103 | } | |
104 | ||
105 | if (!bfd_check_format (temp_bfd, bfd_core)) | |
106 | { | |
107 | bfd_close (temp_bfd); | |
108 | error ("\"%s\" does not appear to be a core dump", filename); | |
109 | } | |
110 | ||
111 | /* Looks semi-reasonable. Toss the old core file and work on the new. */ | |
112 | ||
113 | discard_cleanups (old_chain); /* Don't free filename any more */ | |
114 | unpush_target (&core_ops); | |
115 | core_bfd = temp_bfd; | |
116 | old_chain = make_cleanup (core_close, core_bfd); | |
117 | ||
118 | validate_files (); | |
119 | ||
120 | /* Find the data section */ | |
121 | if (build_section_table (core_bfd, &core_sections, &core_sections_end)) | |
122 | error ("Can't find sections in `%s': %s", bfd_get_filename(core_bfd), | |
123 | bfd_errmsg (bfd_error)); | |
124 | ||
125 | ontop = !push_target (&core_ops); | |
126 | ||
127 | p = bfd_core_file_failing_command (core_bfd); | |
128 | if (p) | |
129 | printf ("Core file invoked as `%s'.\n", p); | |
130 | ||
131 | siggy = bfd_core_file_failing_signal (core_bfd); | |
132 | if (siggy > 0) | |
133 | printf ("Program terminated with signal %d, %s.\n", siggy, | |
134 | siggy < NSIG ? sys_siglist[siggy] : "(undocumented)"); | |
135 | ||
136 | if (ontop) { | |
137 | /* Fetch all registers from core file */ | |
138 | target_fetch_registers (-1); | |
139 | set_current_frame ( create_new_frame (read_register (FP_REGNUM), | |
140 | read_pc ())); | |
141 | select_frame (get_current_frame (), 0); | |
142 | /* FIXME, handle shared library reading here. */ | |
143 | print_sel_frame (0); /* Print the top frame and source line */ | |
144 | } else { | |
145 | printf ( | |
146 | "Warning: you won't be able to access this core file until you terminate\n\ | |
147 | your %s; do ``info files''\n", current_target->to_longname); | |
148 | } | |
149 | ||
150 | discard_cleanups (old_chain); | |
151 | } | |
152 | ||
153 | void | |
154 | core_detach (args, from_tty) | |
155 | char *args; | |
156 | int from_tty; | |
157 | { | |
dd3b648e RP |
158 | if (args) |
159 | error ("Too many arguments"); | |
3f2e006b | 160 | unpush_target (&core_ops); |
dd3b648e RP |
161 | if (from_tty) |
162 | printf ("No core file now.\n"); | |
163 | } | |
164 | ||
165 | /* Backward compatability with old way of specifying core files. */ | |
166 | ||
167 | void | |
168 | core_file_command (filename, from_tty) | |
169 | char *filename; | |
170 | int from_tty; | |
171 | { | |
3f2e006b | 172 | dont_repeat (); /* Either way, seems bogus. */ |
dd3b648e RP |
173 | if (!filename) |
174 | core_detach (filename, from_tty); | |
175 | else | |
176 | core_open (filename, from_tty); | |
177 | } | |
178 | ||
179 | \f | |
180 | /* Call this to specify the hook for exec_file_command to call back. | |
181 | This is called from the x-window display code. */ | |
182 | ||
183 | void | |
184 | specify_exec_file_hook (hook) | |
185 | void (*hook) (); | |
186 | { | |
187 | exec_file_display_hook = hook; | |
188 | } | |
189 | ||
190 | /* The exec file must be closed before running an inferior. | |
191 | If it is needed again after the inferior dies, it must | |
192 | be reopened. */ | |
193 | ||
194 | void | |
195 | close_exec_file () | |
196 | { | |
197 | #ifdef FIXME | |
198 | if (exec_bfd) | |
199 | bfd_tempclose (exec_bfd); | |
200 | #endif | |
201 | } | |
202 | ||
203 | void | |
204 | reopen_exec_file () | |
205 | { | |
206 | #ifdef FIXME | |
207 | if (exec_bfd) | |
208 | bfd_reopen (exec_bfd); | |
209 | #endif | |
210 | } | |
211 | \f | |
212 | /* If we have both a core file and an exec file, | |
213 | print a warning if they don't go together. | |
214 | This should really check that the core file came | |
215 | from that exec file, but I don't know how to do it. */ | |
216 | ||
217 | void | |
218 | validate_files () | |
219 | { | |
220 | if (exec_bfd && core_bfd) | |
221 | { | |
222 | if (core_file_matches_executable_p (core_bfd, exec_bfd)) | |
223 | printf ("Warning: core file does not match specified executable file.\n"); | |
224 | else if (bfd_get_mtime(exec_bfd) > bfd_get_mtime(core_bfd)) | |
225 | printf ("Warning: exec file is newer than core file.\n"); | |
226 | } | |
227 | } | |
228 | ||
229 | /* Return the name of the executable file as a string. | |
230 | ERR nonzero means get error if there is none specified; | |
231 | otherwise return 0 in that case. */ | |
232 | ||
233 | char * | |
234 | get_exec_file (err) | |
235 | int err; | |
236 | { | |
237 | if (exec_bfd) return bfd_get_filename(exec_bfd); | |
238 | if (!err) return NULL; | |
239 | ||
240 | error ("No executable file specified.\n\ | |
241 | Use the \"file\" or \"exec-file\" command."); | |
242 | return NULL; | |
243 | } | |
244 | ||
245 | static void | |
246 | core_files_info () | |
247 | { | |
248 | struct section_table *p; | |
249 | ||
250 | printf ("\tCore file `%s'.\n", bfd_get_filename(core_bfd)); | |
251 | ||
252 | for (p = core_sections; p < core_sections_end; p++) | |
253 | printf("\tcore file from 0x%08x to 0x%08x is %s\n", | |
254 | p->addr, p->endaddr, | |
255 | bfd_section_name (core_bfd, p->sec_ptr)); | |
256 | } | |
257 | \f | |
258 | void | |
259 | memory_error (status, memaddr) | |
260 | int status; | |
261 | CORE_ADDR memaddr; | |
262 | { | |
263 | ||
264 | if (status == EIO) | |
265 | { | |
266 | /* Actually, address between memaddr and memaddr + len | |
267 | was out of bounds. */ | |
268 | error ("Cannot access memory: address 0x%x out of bounds.", memaddr); | |
269 | } | |
270 | else | |
271 | { | |
272 | if (status >= sys_nerr || status < 0) | |
273 | error ("Error accessing memory address 0x%x: unknown error (%d).", | |
274 | memaddr, status); | |
275 | else | |
276 | error ("Error accessing memory address 0x%x: %s.", | |
277 | memaddr, sys_errlist[status]); | |
278 | } | |
279 | } | |
280 | ||
281 | /* Same as target_read_memory, but report an error if can't read. */ | |
282 | void | |
283 | read_memory (memaddr, myaddr, len) | |
284 | CORE_ADDR memaddr; | |
285 | char *myaddr; | |
286 | int len; | |
287 | { | |
288 | int status; | |
289 | status = target_read_memory (memaddr, myaddr, len); | |
290 | if (status != 0) | |
291 | memory_error (status, memaddr); | |
292 | } | |
293 | ||
294 | /* Same as target_write_memory, but report an error if can't write. */ | |
295 | void | |
296 | write_memory (memaddr, myaddr, len) | |
297 | CORE_ADDR memaddr; | |
298 | char *myaddr; | |
299 | int len; | |
300 | { | |
301 | int status; | |
302 | ||
303 | status = target_write_memory (memaddr, myaddr, len); | |
304 | if (status != 0) | |
305 | memory_error (status, memaddr); | |
306 | } | |
307 | ||
308 | /* Read an integer from debugged memory, given address and number of bytes. */ | |
309 | ||
310 | long | |
311 | read_memory_integer (memaddr, len) | |
312 | CORE_ADDR memaddr; | |
313 | int len; | |
314 | { | |
315 | char cbuf; | |
316 | short sbuf; | |
317 | int ibuf; | |
318 | long lbuf; | |
319 | ||
320 | if (len == sizeof (char)) | |
321 | { | |
322 | read_memory (memaddr, &cbuf, len); | |
323 | return cbuf; | |
324 | } | |
325 | if (len == sizeof (short)) | |
326 | { | |
327 | read_memory (memaddr, (char *)&sbuf, len); | |
328 | SWAP_TARGET_AND_HOST (&sbuf, sizeof (short)); | |
329 | return sbuf; | |
330 | } | |
331 | if (len == sizeof (int)) | |
332 | { | |
333 | read_memory (memaddr, (char *)&ibuf, len); | |
334 | SWAP_TARGET_AND_HOST (&ibuf, sizeof (int)); | |
335 | return ibuf; | |
336 | } | |
337 | if (len == sizeof (lbuf)) | |
338 | { | |
339 | read_memory (memaddr, (char *)&lbuf, len); | |
340 | SWAP_TARGET_AND_HOST (&lbuf, sizeof (lbuf)); | |
341 | return lbuf; | |
342 | } | |
343 | error ("Cannot handle integers of %d bytes.", len); | |
344 | return -1; /* for lint */ | |
345 | } | |
346 | \f | |
347 | /* Read or write the core file. | |
348 | ||
349 | Args are address within core file, address within gdb address-space, | |
350 | length, and a flag indicating whether to read or write. | |
351 | ||
352 | Result is a length: | |
353 | ||
354 | 0: We cannot handle this address and length. | |
355 | > 0: We have handled N bytes starting at this address. | |
356 | (If N == length, we did it all.) We might be able | |
357 | to handle more bytes beyond this length, but no | |
358 | promises. | |
359 | < 0: We cannot handle this address, but if somebody | |
360 | else handles (-N) bytes, we can start from there. | |
361 | ||
362 | The actual work is done by xfer_memory in exec.c, which we share | |
363 | in common with exec_xfer_memory(). */ | |
364 | ||
365 | static int | |
366 | core_xfer_memory (memaddr, myaddr, len, write) | |
367 | CORE_ADDR memaddr; | |
368 | char *myaddr; | |
369 | int len; | |
370 | int write; | |
371 | { | |
372 | return xfer_memory (memaddr, myaddr, len, write, | |
373 | core_bfd, core_sections, core_sections_end); | |
374 | } | |
375 | \f | |
376 | /* Get the registers out of a core file. This is the machine- | |
377 | independent part. Fetch_core_registers is the machine-dependent | |
378 | part, typically implemented in the xm-file for each architecture. */ | |
379 | ||
380 | static int | |
381 | get_core_registers (regno) | |
382 | int regno; | |
383 | { | |
384 | sec_ptr reg_sec; | |
385 | unsigned size; | |
386 | char *the_regs; | |
387 | ||
388 | reg_sec = bfd_get_section_by_name (core_bfd, ".reg"); | |
389 | size = bfd_section_size (core_bfd, reg_sec); | |
390 | the_regs = alloca (size); | |
391 | if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, | |
392 | (unsigned)0, size)) | |
393 | { | |
394 | fetch_core_registers (the_regs, size, 0); | |
395 | } | |
396 | else | |
397 | { | |
398 | fprintf (stderr, "Couldn't fetch registers from core file: %s\n", | |
399 | bfd_errmsg (bfd_error)); | |
400 | } | |
401 | ||
402 | /* Now do it again for the float registers, if they exist. */ | |
403 | reg_sec = bfd_get_section_by_name (core_bfd, ".reg2"); | |
404 | if (reg_sec) { | |
405 | size = bfd_section_size (core_bfd, reg_sec); | |
406 | the_regs = alloca (size); | |
407 | if (bfd_get_section_contents (core_bfd, reg_sec, the_regs, | |
408 | (unsigned)0, size)) | |
409 | { | |
410 | fetch_core_registers (the_regs, size, 2); | |
411 | } | |
412 | else | |
413 | { | |
414 | fprintf (stderr, "Couldn't fetch register set 2 from core file: %s\n", | |
415 | bfd_errmsg (bfd_error)); | |
416 | } | |
417 | } | |
418 | registers_fetched(); | |
419 | return 0; /* FIXME, what result goes here? */ | |
420 | } | |
421 | \f | |
422 | struct target_ops core_ops = { | |
423 | "core", "Local core dump file", | |
424 | core_open, core_close, | |
425 | child_attach, core_detach, 0, 0, /* resume, wait */ | |
426 | get_core_registers, | |
427 | 0, 0, 0, 0, /* store_regs, prepare_to_store, conv_to, conv_from */ | |
428 | core_xfer_memory, core_files_info, | |
429 | 0, 0, /* core_insert_breakpoint, core_remove_breakpoint, */ | |
430 | 0, 0, 0, 0, 0, /* terminal stuff */ | |
431 | 0, 0, 0, 0, 0, /* kill, load, add_syms, call fn, lookup sym */ | |
432 | child_create_inferior, 0, /* mourn_inferior */ | |
433 | core_stratum, 0, /* next */ | |
434 | 0, 1, 1, 1, 0, /* all mem, mem, stack, regs, exec */ | |
435 | OPS_MAGIC, /* Always the last thing */ | |
436 | }; | |
437 | ||
438 | void | |
439 | _initialize_core() | |
440 | { | |
441 | ||
442 | add_com ("core-file", class_files, core_file_command, | |
443 | "Use FILE as core dump for examining memory and registers.\n\ | |
444 | No arg means have no core file. This command has been superseded by the\n\ | |
445 | `target core' and `detach' commands."); | |
446 | add_target (&core_ops); | |
447 | } |