1 /* Core dump and executable file functions above target vector, for GDB.
3 Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1996, 1997, 1998,
4 1999, 2000, 2001, 2003, 2006, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */
22 #include "gdb_string.h"
35 #include "completer.h"
36 #include "exceptions.h"
38 /* Local function declarations. */
40 extern void _initialize_core (void);
41 static void call_extra_exec_file_hooks (char *filename);
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. */
52 typedef void (*hook_type) (char *);
54 hook_type deprecated_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 */
58 /* Binary file diddling handle for the core file. */
63 /* Backward compatability with old way of specifying core files. */
66 core_file_command (char *filename, int from_tty)
70 dont_repeat (); /* Either way, seems bogus. */
72 t = find_core_target ();
74 error (_("GDB can't read core files on this machine."));
77 (t->to_detach) (filename, from_tty);
79 (t->to_open) (filename, from_tty);
83 /* If there are two or more functions that wish to hook into
84 exec_file_command, this function will call all of the hook
88 call_extra_exec_file_hooks (char *filename)
92 for (i = 0; i < exec_file_hook_count; i++)
93 (*exec_file_extra_hooks[i]) (filename);
96 /* Call this to specify the hook for exec_file_command to call back.
97 This is called from the x-window display code. */
100 specify_exec_file_hook (void (*hook) (char *))
102 hook_type *new_array;
104 if (deprecated_exec_file_display_hook != NULL)
106 /* There's already a hook installed. Arrange to have both it
107 * and the subsequent hooks called. */
108 if (exec_file_hook_count == 0)
110 /* If this is the first extra hook, initialize the hook array. */
111 exec_file_extra_hooks = (hook_type *) xmalloc (sizeof (hook_type));
112 exec_file_extra_hooks[0] = deprecated_exec_file_display_hook;
113 deprecated_exec_file_display_hook = call_extra_exec_file_hooks;
114 exec_file_hook_count = 1;
117 /* Grow the hook array by one and add the new hook to the end.
118 Yes, it's inefficient to grow it by one each time but since
119 this is hardly ever called it's not a big deal. */
120 exec_file_hook_count++;
122 (hook_type *) xrealloc (exec_file_extra_hooks,
123 exec_file_hook_count * sizeof (hook_type));
124 exec_file_extra_hooks = new_array;
125 exec_file_extra_hooks[exec_file_hook_count - 1] = hook;
128 deprecated_exec_file_display_hook = hook;
131 /* The exec file must be closed before running an inferior.
132 If it is needed again after the inferior dies, it must
136 close_exec_file (void)
140 bfd_tempclose (exec_bfd);
145 reopen_exec_file (void)
149 bfd_reopen (exec_bfd);
156 /* Don't do anything if there isn't an exec file. */
157 if (exec_bfd == NULL)
160 /* If the timestamp of the exec file has changed, reopen it. */
161 filename = xstrdup (bfd_get_filename (exec_bfd));
162 make_cleanup (xfree, filename);
163 res = stat (filename, &st);
165 if (exec_bfd_mtime && exec_bfd_mtime != st.st_mtime)
166 exec_file_attach (filename, 0);
170 /* If we have both a core file and an exec file,
171 print a warning if they don't go together. */
174 validate_files (void)
176 if (exec_bfd && core_bfd)
178 if (!core_file_matches_executable_p (core_bfd, exec_bfd))
179 warning (_("core file may not match specified executable file."));
180 else if (bfd_get_mtime (exec_bfd) > bfd_get_mtime (core_bfd))
181 warning (_("exec file is newer than core file."));
185 /* Return the name of the executable file as a string.
186 ERR nonzero means get error if there is none specified;
187 otherwise return 0 in that case. */
190 get_exec_file (int err)
193 return bfd_get_filename (exec_bfd);
197 error (_("No executable file specified.\n\
198 Use the \"file\" or \"exec-file\" command."));
203 /* Report a memory error with error(). */
206 memory_error (int status, CORE_ADDR memaddr)
208 struct ui_file *tmp_stream = mem_fileopen ();
209 make_cleanup_ui_file_delete (tmp_stream);
213 /* Actually, address between memaddr and memaddr + len
214 was out of bounds. */
215 fprintf_unfiltered (tmp_stream, "Cannot access memory at address ");
216 fputs_filtered (paddress (memaddr), tmp_stream);
220 fprintf_filtered (tmp_stream, "Error accessing memory address ");
221 fputs_filtered (paddress (memaddr), tmp_stream);
222 fprintf_filtered (tmp_stream, ": %s.",
223 safe_strerror (status));
226 error_stream (tmp_stream);
229 /* Same as target_read_memory, but report an error if can't read. */
231 read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
234 status = target_read_memory (memaddr, myaddr, len);
236 memory_error (status, memaddr);
239 /* Argument / return result struct for use with
240 do_captured_read_memory_integer(). MEMADDR and LEN are filled in
241 by gdb_read_memory_integer(). RESULT is the contents that were
242 successfully read from MEMADDR of length LEN. */
244 struct captured_read_memory_integer_arguments
251 /* Helper function for gdb_read_memory_integer(). DATA must be a
252 pointer to a captured_read_memory_integer_arguments struct.
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. */
259 do_captured_read_memory_integer (void *data)
261 struct captured_read_memory_integer_arguments *args = (struct captured_read_memory_integer_arguments*) data;
262 CORE_ADDR memaddr = args->memaddr;
265 args->result = read_memory_integer (memaddr, len);
270 /* Read memory at MEMADDR of length LEN and put the contents in
271 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
275 safe_read_memory_integer (CORE_ADDR memaddr, int len, LONGEST *return_value)
278 struct captured_read_memory_integer_arguments args;
279 args.memaddr = memaddr;
282 status = catch_errors (do_captured_read_memory_integer, &args,
283 "", RETURN_MASK_ALL);
285 *return_value = args.result;
291 read_memory_integer (CORE_ADDR memaddr, int len)
293 gdb_byte buf[sizeof (LONGEST)];
295 read_memory (memaddr, buf, len);
296 return extract_signed_integer (buf, len);
300 read_memory_unsigned_integer (CORE_ADDR memaddr, int len)
302 gdb_byte buf[sizeof (ULONGEST)];
304 read_memory (memaddr, buf, len);
305 return extract_unsigned_integer (buf, len);
309 read_memory_string (CORE_ADDR memaddr, char *buffer, int max_len)
318 if (cp - buffer >= max_len)
320 buffer[max_len - 1] = '\0';
323 cnt = max_len - (cp - buffer);
326 read_memory (memaddr + (int) (cp - buffer), cp, cnt);
327 for (i = 0; i < cnt && *cp; i++, cp++)
336 read_memory_typed_address (CORE_ADDR addr, struct type *type)
338 gdb_byte *buf = alloca (TYPE_LENGTH (type));
339 read_memory (addr, buf, TYPE_LENGTH (type));
340 return extract_typed_address (buf, type);
343 /* Same as target_write_memory, but report an error if can't write. */
345 write_memory (CORE_ADDR memaddr, const bfd_byte *myaddr, int len)
348 gdb_byte *bytes = alloca (len);
350 memcpy (bytes, myaddr, len);
351 status = target_write_memory (memaddr, bytes, len);
353 memory_error (status, memaddr);
356 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned integer. */
358 write_memory_unsigned_integer (CORE_ADDR addr, int len, ULONGEST value)
360 gdb_byte *buf = alloca (len);
361 store_unsigned_integer (buf, len, value);
362 write_memory (addr, buf, len);
365 /* Store VALUE at ADDR in the inferior as a LEN-byte signed integer. */
367 write_memory_signed_integer (CORE_ADDR addr, int len, LONGEST value)
369 gdb_byte *buf = alloca (len);
370 store_signed_integer (buf, len, value);
371 write_memory (addr, buf, len);
377 /* Enable after 4.12. It is not tested. */
379 /* Search code. Targets can just make this their search function, or
380 if the protocol has a less general search function, they can call this
381 in the cases it can't handle. */
383 generic_search (int len, char *data, char *mask, CORE_ADDR startaddr,
384 int increment, CORE_ADDR lorange, CORE_ADDR hirange,
385 CORE_ADDR *addr_found, char *data_found)
388 CORE_ADDR curaddr = startaddr;
390 while (curaddr >= lorange && curaddr < hirange)
392 read_memory (curaddr, data_found, len);
393 for (i = 0; i < len; ++i)
394 if ((data_found[i] & mask[i]) != data[i])
397 *addr_found = curaddr;
401 curaddr += increment;
403 *addr_found = (CORE_ADDR) 0;
408 /* The current default bfd target. Points to storage allocated for
412 /* Same thing, except it is "auto" not NULL for the default case. */
413 static char *gnutarget_string;
415 show_gnutarget_string (struct ui_file *file, int from_tty,
416 struct cmd_list_element *c, const char *value)
418 fprintf_filtered (file, _("The current BFD target is \"%s\".\n"), value);
421 static void set_gnutarget_command (char *, int, struct cmd_list_element *);
424 set_gnutarget_command (char *ignore, int from_tty, struct cmd_list_element *c)
426 if (strcmp (gnutarget_string, "auto") == 0)
429 gnutarget = gnutarget_string;
432 /* Set the gnutarget. */
434 set_gnutarget (char *newtarget)
436 if (gnutarget_string != NULL)
437 xfree (gnutarget_string);
438 gnutarget_string = savestring (newtarget, strlen (newtarget));
439 set_gnutarget_command (NULL, 0, NULL);
443 _initialize_core (void)
445 struct cmd_list_element *c;
446 c = add_cmd ("core-file", class_files, core_file_command, _("\
447 Use FILE as core dump for examining memory and registers.\n\
448 No arg means have no core file. This command has been superseded by the\n\
449 `target core' and `detach' commands."), &cmdlist);
450 set_cmd_completer (c, filename_completer);
453 add_setshow_string_noescape_cmd ("gnutarget", class_files,
454 &gnutarget_string, _("(\
455 Set the current BFD target."), _("\
456 Show the current BFD target."), _("\
457 Use `set gnutarget auto' to specify automatic detection."),
458 set_gnutarget_command,
459 show_gnutarget_string,
460 &setlist, &showlist);
462 if (getenv ("GNUTARGET"))
463 set_gnutarget (getenv ("GNUTARGET"));
465 set_gnutarget ("auto");