1 /* Core dump and executable file functions above target vector, for GDB.
3 Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1996, 1997,
4 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
6 This file is part of GDB.
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
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 #include "gdb_string.h"
37 #include "completer.h"
38 #include "exceptions.h"
40 /* Local function declarations. */
42 extern void _initialize_core (void);
43 static void call_extra_exec_file_hooks (char *filename);
45 /* You can have any number of hooks for `exec_file_command' command to
46 call. If there's only one hook, it is set in exec_file_display
47 hook. If there are two or more hooks, they are set in
48 exec_file_extra_hooks[], and deprecated_exec_file_display_hook is
49 set to a function that calls all of them. This extra complexity is
50 needed to preserve compatibility with old code that assumed that
51 only one hook could be set, and which called
52 deprecated_exec_file_display_hook directly. */
54 typedef void (*hook_type) (char *);
56 hook_type deprecated_exec_file_display_hook; /* the original hook */
57 static hook_type *exec_file_extra_hooks; /* array of additional hooks */
58 static int exec_file_hook_count = 0; /* size of array */
60 /* Binary file diddling handle for the core file. */
65 /* Backward compatability with old way of specifying core files. */
68 core_file_command (char *filename, int from_tty)
72 dont_repeat (); /* Either way, seems bogus. */
74 t = find_core_target ();
76 error (_("GDB can't read core files on this machine."));
79 (t->to_detach) (filename, from_tty);
81 (t->to_open) (filename, from_tty);
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
90 call_extra_exec_file_hooks (char *filename)
94 for (i = 0; i < exec_file_hook_count; i++)
95 (*exec_file_extra_hooks[i]) (filename);
98 /* Call this to specify the hook for exec_file_command to call back.
99 This is called from the x-window display code. */
102 specify_exec_file_hook (void (*hook) (char *))
104 hook_type *new_array;
106 if (deprecated_exec_file_display_hook != NULL)
108 /* There's already a hook installed. Arrange to have both it
109 * and the subsequent hooks called. */
110 if (exec_file_hook_count == 0)
112 /* If this is the first extra hook, initialize the hook array. */
113 exec_file_extra_hooks = (hook_type *) xmalloc (sizeof (hook_type));
114 exec_file_extra_hooks[0] = deprecated_exec_file_display_hook;
115 deprecated_exec_file_display_hook = call_extra_exec_file_hooks;
116 exec_file_hook_count = 1;
119 /* Grow the hook array by one and add the new hook to the end.
120 Yes, it's inefficient to grow it by one each time but since
121 this is hardly ever called it's not a big deal. */
122 exec_file_hook_count++;
124 (hook_type *) xrealloc (exec_file_extra_hooks,
125 exec_file_hook_count * sizeof (hook_type));
126 exec_file_extra_hooks = new_array;
127 exec_file_extra_hooks[exec_file_hook_count - 1] = hook;
130 deprecated_exec_file_display_hook = hook;
133 /* The exec file must be closed before running an inferior.
134 If it is needed again after the inferior dies, it must
138 close_exec_file (void)
142 bfd_tempclose (exec_bfd);
147 reopen_exec_file (void)
151 bfd_reopen (exec_bfd);
158 /* Don't do anything if the current target isn't exec. */
159 if (exec_bfd == NULL || strcmp (target_shortname, "exec") != 0)
162 /* If the timestamp of the exec file has changed, reopen it. */
163 filename = xstrdup (bfd_get_filename (exec_bfd));
164 make_cleanup (xfree, filename);
165 mtime = bfd_get_mtime (exec_bfd);
166 res = stat (filename, &st);
168 if (mtime && mtime != st.st_mtime)
170 exec_open (filename, 0);
175 /* If we have both a core file and an exec file,
176 print a warning if they don't go together. */
179 validate_files (void)
181 if (exec_bfd && core_bfd)
183 if (!core_file_matches_executable_p (core_bfd, exec_bfd))
184 warning (_("core file may not match specified executable file."));
185 else if (bfd_get_mtime (exec_bfd) > bfd_get_mtime (core_bfd))
186 warning (_("exec file is newer than core file."));
190 /* Return the name of the executable file as a string.
191 ERR nonzero means get error if there is none specified;
192 otherwise return 0 in that case. */
195 get_exec_file (int err)
198 return bfd_get_filename (exec_bfd);
202 error (_("No executable file specified.\n\
203 Use the \"file\" or \"exec-file\" command."));
208 /* Report a memory error with error(). */
211 memory_error (int status, CORE_ADDR memaddr)
213 struct ui_file *tmp_stream = mem_fileopen ();
214 make_cleanup_ui_file_delete (tmp_stream);
218 /* Actually, address between memaddr and memaddr + len
219 was out of bounds. */
220 fprintf_unfiltered (tmp_stream, "Cannot access memory at address ");
221 deprecated_print_address_numeric (memaddr, 1, tmp_stream);
225 fprintf_filtered (tmp_stream, "Error accessing memory address ");
226 deprecated_print_address_numeric (memaddr, 1, tmp_stream);
227 fprintf_filtered (tmp_stream, ": %s.",
228 safe_strerror (status));
231 error_stream (tmp_stream);
234 /* Same as target_read_memory, but report an error if can't read. */
236 read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
239 status = target_read_memory (memaddr, myaddr, len);
241 memory_error (status, memaddr);
244 /* Argument / return result struct for use with
245 do_captured_read_memory_integer(). MEMADDR and LEN are filled in
246 by gdb_read_memory_integer(). RESULT is the contents that were
247 successfully read from MEMADDR of length LEN. */
249 struct captured_read_memory_integer_arguments
256 /* Helper function for gdb_read_memory_integer(). DATA must be a
257 pointer to a captured_read_memory_integer_arguments struct.
258 Return 1 if successful. Note that the catch_errors() interface
259 will return 0 if an error occurred while reading memory. This
260 choice of return code is so that we can distinguish between
261 success and failure. */
264 do_captured_read_memory_integer (void *data)
266 struct captured_read_memory_integer_arguments *args = (struct captured_read_memory_integer_arguments*) data;
267 CORE_ADDR memaddr = args->memaddr;
270 args->result = read_memory_integer (memaddr, len);
275 /* Read memory at MEMADDR of length LEN and put the contents in
276 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
280 safe_read_memory_integer (CORE_ADDR memaddr, int len, LONGEST *return_value)
283 struct captured_read_memory_integer_arguments args;
284 args.memaddr = memaddr;
287 status = catch_errors (do_captured_read_memory_integer, &args,
288 "", RETURN_MASK_ALL);
290 *return_value = args.result;
296 read_memory_integer (CORE_ADDR memaddr, int len)
298 char buf[sizeof (LONGEST)];
300 read_memory (memaddr, buf, len);
301 return extract_signed_integer (buf, len);
305 read_memory_unsigned_integer (CORE_ADDR memaddr, int len)
307 char buf[sizeof (ULONGEST)];
309 read_memory (memaddr, buf, len);
310 return extract_unsigned_integer (buf, len);
314 read_memory_string (CORE_ADDR memaddr, char *buffer, int max_len)
323 if (cp - buffer >= max_len)
325 buffer[max_len - 1] = '\0';
328 cnt = max_len - (cp - buffer);
331 read_memory (memaddr + (int) (cp - buffer), cp, cnt);
332 for (i = 0; i < cnt && *cp; i++, cp++)
341 read_memory_typed_address (CORE_ADDR addr, struct type *type)
343 char *buf = alloca (TYPE_LENGTH (type));
344 read_memory (addr, buf, TYPE_LENGTH (type));
345 return extract_typed_address (buf, type);
348 /* Same as target_write_memory, but report an error if can't write. */
350 write_memory (CORE_ADDR memaddr, const bfd_byte *myaddr, int len)
353 bfd_byte *bytes = alloca (len);
355 memcpy (bytes, myaddr, len);
356 status = target_write_memory (memaddr, bytes, len);
358 memory_error (status, memaddr);
361 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned integer. */
363 write_memory_unsigned_integer (CORE_ADDR addr, int len, ULONGEST value)
365 char *buf = alloca (len);
366 store_unsigned_integer (buf, len, value);
367 write_memory (addr, buf, len);
370 /* Store VALUE at ADDR in the inferior as a LEN-byte signed integer. */
372 write_memory_signed_integer (CORE_ADDR addr, int len, LONGEST value)
374 char *buf = alloca (len);
375 store_signed_integer (buf, len, value);
376 write_memory (addr, buf, len);
382 /* Enable after 4.12. It is not tested. */
384 /* Search code. Targets can just make this their search function, or
385 if the protocol has a less general search function, they can call this
386 in the cases it can't handle. */
388 generic_search (int len, char *data, char *mask, CORE_ADDR startaddr,
389 int increment, CORE_ADDR lorange, CORE_ADDR hirange,
390 CORE_ADDR *addr_found, char *data_found)
393 CORE_ADDR curaddr = startaddr;
395 while (curaddr >= lorange && curaddr < hirange)
397 read_memory (curaddr, data_found, len);
398 for (i = 0; i < len; ++i)
399 if ((data_found[i] & mask[i]) != data[i])
402 *addr_found = curaddr;
406 curaddr += increment;
408 *addr_found = (CORE_ADDR) 0;
413 /* The current default bfd target. Points to storage allocated for
417 /* Same thing, except it is "auto" not NULL for the default case. */
418 static char *gnutarget_string;
420 show_gnutarget_string (struct ui_file *file, int from_tty,
421 struct cmd_list_element *c, const char *value)
423 fprintf_filtered (file, _("The current BFD target is \"%s\".\n"), value);
426 static void set_gnutarget_command (char *, int, struct cmd_list_element *);
429 set_gnutarget_command (char *ignore, int from_tty, struct cmd_list_element *c)
431 if (strcmp (gnutarget_string, "auto") == 0)
434 gnutarget = gnutarget_string;
437 /* Set the gnutarget. */
439 set_gnutarget (char *newtarget)
441 if (gnutarget_string != NULL)
442 xfree (gnutarget_string);
443 gnutarget_string = savestring (newtarget, strlen (newtarget));
444 set_gnutarget_command (NULL, 0, NULL);
448 _initialize_core (void)
450 struct cmd_list_element *c;
451 c = add_cmd ("core-file", class_files, core_file_command, _("\
452 Use FILE as core dump for examining memory and registers.\n\
453 No arg means have no core file. This command has been superseded by the\n\
454 `target core' and `detach' commands."), &cmdlist);
455 set_cmd_completer (c, filename_completer);
458 add_setshow_string_noescape_cmd ("gnutarget", class_files,
459 &gnutarget_string, _("(\
460 Set the current BFD target."), _("\
461 Show the current BFD target."), _("\
462 Use `set gnutarget auto' to specify automatic detection."),
463 set_gnutarget_command,
464 show_gnutarget_string,
465 &setlist, &showlist);
467 if (getenv ("GNUTARGET"))
468 set_gnutarget (getenv ("GNUTARGET"));
470 set_gnutarget ("auto");