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, 2009
5 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "gdb_string.h"
36 #include "completer.h"
37 #include "exceptions.h"
39 /* Local function declarations. */
41 extern void _initialize_core (void);
42 static void call_extra_exec_file_hooks (char *filename);
44 /* You can have any number of hooks for `exec_file_command' command to
45 call. If there's only one hook, it is set in exec_file_display
46 hook. If there are two or more hooks, they are set in
47 exec_file_extra_hooks[], and deprecated_exec_file_display_hook is
48 set to a function that calls all of them. This extra complexity is
49 needed to preserve compatibility with old code that assumed that
50 only one hook could be set, and which called
51 deprecated_exec_file_display_hook directly. */
53 typedef void (*hook_type) (char *);
55 hook_type deprecated_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 */
59 /* Binary file diddling handle for the core file. */
64 /* Backward compatability with old way of specifying core files. */
67 core_file_command (char *filename, int from_tty)
71 dont_repeat (); /* Either way, seems bogus. */
73 t = find_core_target ();
75 error (_("GDB can't read core files on this machine."));
78 (t->to_detach) (t, filename, from_tty);
80 (t->to_open) (filename, from_tty);
84 /* If there are two or more functions that wish to hook into
85 exec_file_command, this function will call all of the hook
89 call_extra_exec_file_hooks (char *filename)
93 for (i = 0; i < exec_file_hook_count; i++)
94 (*exec_file_extra_hooks[i]) (filename);
97 /* Call this to specify the hook for exec_file_command to call back.
98 This is called from the x-window display code. */
101 specify_exec_file_hook (void (*hook) (char *))
103 hook_type *new_array;
105 if (deprecated_exec_file_display_hook != NULL)
107 /* There's already a hook installed. Arrange to have both it
108 * and the subsequent hooks called. */
109 if (exec_file_hook_count == 0)
111 /* If this is the first extra hook, initialize the hook array. */
112 exec_file_extra_hooks = (hook_type *) xmalloc (sizeof (hook_type));
113 exec_file_extra_hooks[0] = deprecated_exec_file_display_hook;
114 deprecated_exec_file_display_hook = call_extra_exec_file_hooks;
115 exec_file_hook_count = 1;
118 /* Grow the hook array by one and add the new hook to the end.
119 Yes, it's inefficient to grow it by one each time but since
120 this is hardly ever called it's not a big deal. */
121 exec_file_hook_count++;
123 (hook_type *) xrealloc (exec_file_extra_hooks,
124 exec_file_hook_count * sizeof (hook_type));
125 exec_file_extra_hooks = new_array;
126 exec_file_extra_hooks[exec_file_hook_count - 1] = hook;
129 deprecated_exec_file_display_hook = hook;
132 /* The exec file must be closed before running an inferior.
133 If it is needed again after the inferior dies, it must
137 close_exec_file (void)
141 bfd_tempclose (exec_bfd);
146 reopen_exec_file (void)
150 bfd_reopen (exec_bfd);
156 struct cleanup *cleanups;
158 /* Don't do anything if there isn't an exec file. */
159 if (exec_bfd == NULL)
162 /* If the timestamp of the exec file has changed, reopen it. */
163 filename = xstrdup (bfd_get_filename (exec_bfd));
164 cleanups = make_cleanup (xfree, filename);
165 res = stat (filename, &st);
167 if (exec_bfd_mtime && exec_bfd_mtime != st.st_mtime)
168 exec_file_attach (filename, 0);
170 /* If we accessed the file since last opening it, close it now;
171 this stops GDB from holding the executable open after it
173 bfd_cache_close_all ();
175 do_cleanups (cleanups);
179 /* If we have both a core file and an exec file,
180 print a warning if they don't go together. */
183 validate_files (void)
185 if (exec_bfd && core_bfd)
187 if (!core_file_matches_executable_p (core_bfd, exec_bfd))
188 warning (_("core file may not match specified executable file."));
189 else if (bfd_get_mtime (exec_bfd) > bfd_get_mtime (core_bfd))
190 warning (_("exec file is newer than core file."));
194 /* Return the name of the executable file as a string.
195 ERR nonzero means get error if there is none specified;
196 otherwise return 0 in that case. */
199 get_exec_file (int err)
202 return bfd_get_filename (exec_bfd);
206 error (_("No executable file specified.\n\
207 Use the \"file\" or \"exec-file\" command."));
212 /* Report a memory error by throwing a MEMORY_ERROR error. */
215 memory_error (int status, CORE_ADDR memaddr)
218 /* Actually, address between memaddr and memaddr + len was out of
220 throw_error (MEMORY_ERROR,
221 _("Cannot access memory at address %s"),
222 paddress (target_gdbarch, memaddr));
224 throw_error (MEMORY_ERROR,
225 _("Error accessing memory address %s: %s."),
226 paddress (target_gdbarch, memaddr),
227 safe_strerror (status));
230 /* Same as target_read_memory, but report an error if can't read. */
232 read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
235 status = target_read_memory (memaddr, myaddr, len);
237 memory_error (status, memaddr);
240 /* Argument / return result struct for use with
241 do_captured_read_memory_integer(). MEMADDR and LEN are filled in
242 by gdb_read_memory_integer(). RESULT is the contents that were
243 successfully read from MEMADDR of length LEN. */
245 struct captured_read_memory_integer_arguments
252 /* Helper function for gdb_read_memory_integer(). DATA must be a
253 pointer to a captured_read_memory_integer_arguments struct.
254 Return 1 if successful. Note that the catch_errors() interface
255 will return 0 if an error occurred while reading memory. This
256 choice of return code is so that we can distinguish between
257 success and failure. */
260 do_captured_read_memory_integer (void *data)
262 struct captured_read_memory_integer_arguments *args = (struct captured_read_memory_integer_arguments*) data;
263 CORE_ADDR memaddr = args->memaddr;
266 args->result = read_memory_integer (memaddr, len);
271 /* Read memory at MEMADDR of length LEN and put the contents in
272 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
276 safe_read_memory_integer (CORE_ADDR memaddr, int len, LONGEST *return_value)
279 struct captured_read_memory_integer_arguments args;
280 args.memaddr = memaddr;
283 status = catch_errors (do_captured_read_memory_integer, &args,
284 "", RETURN_MASK_ALL);
286 *return_value = args.result;
292 read_memory_integer (CORE_ADDR memaddr, int len)
294 gdb_byte buf[sizeof (LONGEST)];
296 read_memory (memaddr, buf, len);
297 return extract_signed_integer (buf, len);
301 read_memory_unsigned_integer (CORE_ADDR memaddr, int len)
303 gdb_byte buf[sizeof (ULONGEST)];
305 read_memory (memaddr, buf, len);
306 return extract_unsigned_integer (buf, len);
310 read_memory_string (CORE_ADDR memaddr, char *buffer, int max_len)
319 if (cp - buffer >= max_len)
321 buffer[max_len - 1] = '\0';
324 cnt = max_len - (cp - buffer);
327 read_memory (memaddr + (int) (cp - buffer), cp, cnt);
328 for (i = 0; i < cnt && *cp; i++, cp++)
337 read_memory_typed_address (CORE_ADDR addr, struct type *type)
339 gdb_byte *buf = alloca (TYPE_LENGTH (type));
340 read_memory (addr, buf, TYPE_LENGTH (type));
341 return extract_typed_address (buf, type);
344 /* Same as target_write_memory, but report an error if can't write. */
346 write_memory (CORE_ADDR memaddr, const bfd_byte *myaddr, int len)
349 status = target_write_memory (memaddr, myaddr, len);
351 memory_error (status, memaddr);
354 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned integer. */
356 write_memory_unsigned_integer (CORE_ADDR addr, int len, ULONGEST value)
358 gdb_byte *buf = alloca (len);
359 store_unsigned_integer (buf, len, value);
360 write_memory (addr, buf, len);
363 /* Store VALUE at ADDR in the inferior as a LEN-byte signed integer. */
365 write_memory_signed_integer (CORE_ADDR addr, int len, LONGEST value)
367 gdb_byte *buf = alloca (len);
368 store_signed_integer (buf, len, value);
369 write_memory (addr, buf, len);
372 /* The current default bfd target. Points to storage allocated for
376 /* Same thing, except it is "auto" not NULL for the default case. */
377 static char *gnutarget_string;
379 show_gnutarget_string (struct ui_file *file, int from_tty,
380 struct cmd_list_element *c, const char *value)
382 fprintf_filtered (file, _("The current BFD target is \"%s\".\n"), value);
385 static void set_gnutarget_command (char *, int, struct cmd_list_element *);
388 set_gnutarget_command (char *ignore, int from_tty, struct cmd_list_element *c)
390 if (strcmp (gnutarget_string, "auto") == 0)
393 gnutarget = gnutarget_string;
396 /* Set the gnutarget. */
398 set_gnutarget (char *newtarget)
400 if (gnutarget_string != NULL)
401 xfree (gnutarget_string);
402 gnutarget_string = xstrdup (newtarget);
403 set_gnutarget_command (NULL, 0, NULL);
407 _initialize_core (void)
409 struct cmd_list_element *c;
410 c = add_cmd ("core-file", class_files, core_file_command, _("\
411 Use FILE as core dump for examining memory and registers.\n\
412 No arg means have no core file. This command has been superseded by the\n\
413 `target core' and `detach' commands."), &cmdlist);
414 set_cmd_completer (c, filename_completer);
417 add_setshow_string_noescape_cmd ("gnutarget", class_files,
418 &gnutarget_string, _("\
419 Set the current BFD target."), _("\
420 Show the current BFD target."), _("\
421 Use `set gnutarget auto' to specify automatic detection."),
422 set_gnutarget_command,
423 show_gnutarget_string,
424 &setlist, &showlist);
426 if (getenv ("GNUTARGET"))
427 set_gnutarget (getenv ("GNUTARGET"));
429 set_gnutarget ("auto");