1 /* Core dump and executable file functions above target vector, for GDB.
3 Copyright (C) 1986-2013 Free Software Foundation, Inc.
5 This file is part of GDB.
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 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "gdb_string.h"
34 #include "completer.h"
35 #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
57 static int exec_file_hook_count = 0; /* Size of array. */
59 /* Binary file diddling handle for the core file. */
63 /* corelow.c target. It is never NULL after GDB initialization. */
65 struct target_ops *core_target;
68 /* Backward compatability with old way of specifying core files. */
71 core_file_command (char *filename, int from_tty)
73 dont_repeat (); /* Either way, seems bogus. */
75 gdb_assert (core_target != NULL);
78 (core_target->to_detach) (core_target, filename, from_tty);
80 (core_target->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
113 exec_file_extra_hooks = (hook_type *)
114 xmalloc (sizeof (hook_type));
115 exec_file_extra_hooks[0] = deprecated_exec_file_display_hook;
116 deprecated_exec_file_display_hook = call_extra_exec_file_hooks;
117 exec_file_hook_count = 1;
120 /* Grow the hook array by one and add the new hook to the end.
121 Yes, it's inefficient to grow it by one each time but since
122 this is hardly ever called it's not a big deal. */
123 exec_file_hook_count++;
124 new_array = (hook_type *)
125 xrealloc (exec_file_extra_hooks,
126 exec_file_hook_count * sizeof (hook_type));
127 exec_file_extra_hooks = new_array;
128 exec_file_extra_hooks[exec_file_hook_count - 1] = hook;
131 deprecated_exec_file_display_hook = hook;
135 reopen_exec_file (void)
140 struct cleanup *cleanups;
142 /* Don't do anything if there isn't an exec file. */
143 if (exec_bfd == NULL)
146 /* If the timestamp of the exec file has changed, reopen it. */
147 filename = xstrdup (bfd_get_filename (exec_bfd));
148 cleanups = make_cleanup (xfree, filename);
149 res = stat (filename, &st);
151 if (exec_bfd_mtime && exec_bfd_mtime != st.st_mtime)
152 exec_file_attach (filename, 0);
154 /* If we accessed the file since last opening it, close it now;
155 this stops GDB from holding the executable open after it
157 bfd_cache_close_all ();
159 do_cleanups (cleanups);
162 /* If we have both a core file and an exec file,
163 print a warning if they don't go together. */
166 validate_files (void)
168 if (exec_bfd && core_bfd)
170 if (!core_file_matches_executable_p (core_bfd, exec_bfd))
171 warning (_("core file may not match specified executable file."));
172 else if (bfd_get_mtime (exec_bfd) > bfd_get_mtime (core_bfd))
173 warning (_("exec file is newer than core file."));
177 /* Return the name of the executable file as a string.
178 ERR nonzero means get error if there is none specified;
179 otherwise return 0 in that case. */
182 get_exec_file (int err)
185 return bfd_get_filename (exec_bfd);
189 error (_("No executable file specified.\n\
190 Use the \"file\" or \"exec-file\" command."));
195 /* Report a memory error by throwing a MEMORY_ERROR error. */
198 memory_error (int status, CORE_ADDR memaddr)
201 /* Actually, address between memaddr and memaddr + len was out of
203 throw_error (MEMORY_ERROR,
204 _("Cannot access memory at address %s"),
205 paddress (target_gdbarch (), memaddr));
207 throw_error (MEMORY_ERROR,
208 _("Error accessing memory address %s: %s."),
209 paddress (target_gdbarch (), memaddr),
210 safe_strerror (status));
213 /* Same as target_read_memory, but report an error if can't read. */
216 read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
220 status = target_read_memory (memaddr, myaddr, len);
222 memory_error (status, memaddr);
225 /* Same as target_read_stack, but report an error if can't read. */
228 read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
232 status = target_read_stack (memaddr, myaddr, len);
234 memory_error (status, memaddr);
237 /* Argument / return result struct for use with
238 do_captured_read_memory_integer(). MEMADDR and LEN are filled in
239 by gdb_read_memory_integer(). RESULT is the contents that were
240 successfully read from MEMADDR of length LEN. */
242 struct captured_read_memory_integer_arguments
246 enum bfd_endian byte_order;
250 /* Helper function for gdb_read_memory_integer(). DATA must be a
251 pointer to a captured_read_memory_integer_arguments struct.
252 Return 1 if successful. Note that the catch_errors() interface
253 will return 0 if an error occurred while reading memory. This
254 choice of return code is so that we can distinguish between
255 success and failure. */
258 do_captured_read_memory_integer (void *data)
260 struct captured_read_memory_integer_arguments *args
261 = (struct captured_read_memory_integer_arguments*) data;
262 CORE_ADDR memaddr = args->memaddr;
264 enum bfd_endian byte_order = args->byte_order;
266 args->result = read_memory_integer (memaddr, len, byte_order);
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,
277 enum bfd_endian byte_order,
278 LONGEST *return_value)
281 struct captured_read_memory_integer_arguments args;
283 args.memaddr = memaddr;
285 args.byte_order = byte_order;
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,
297 enum bfd_endian byte_order)
299 gdb_byte buf[sizeof (LONGEST)];
301 read_memory (memaddr, buf, len);
302 return extract_signed_integer (buf, len, byte_order);
306 read_memory_unsigned_integer (CORE_ADDR memaddr, int len,
307 enum bfd_endian byte_order)
309 gdb_byte buf[sizeof (ULONGEST)];
311 read_memory (memaddr, buf, len);
312 return extract_unsigned_integer (buf, len, byte_order);
316 read_memory_string (CORE_ADDR memaddr, char *buffer, int max_len)
325 if (cp - buffer >= max_len)
327 buffer[max_len - 1] = '\0';
330 cnt = max_len - (cp - buffer);
333 read_memory (memaddr + (int) (cp - buffer), cp, cnt);
334 for (i = 0; i < cnt && *cp; i++, cp++)
343 read_memory_typed_address (CORE_ADDR addr, struct type *type)
345 gdb_byte *buf = alloca (TYPE_LENGTH (type));
347 read_memory (addr, buf, TYPE_LENGTH (type));
348 return extract_typed_address (buf, type);
351 /* Same as target_write_memory, but report an error if can't
354 write_memory (CORE_ADDR memaddr,
355 const bfd_byte *myaddr, ssize_t len)
359 status = target_write_memory (memaddr, myaddr, len);
361 memory_error (status, memaddr);
364 /* Same as write_memory, but notify 'memory_changed' observers. */
367 write_memory_with_notification (CORE_ADDR memaddr, const bfd_byte *myaddr,
370 write_memory (memaddr, myaddr, len);
371 observer_notify_memory_changed (current_inferior (), memaddr, len, myaddr);
374 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned
377 write_memory_unsigned_integer (CORE_ADDR addr, int len,
378 enum bfd_endian byte_order,
381 gdb_byte *buf = alloca (len);
383 store_unsigned_integer (buf, len, byte_order, value);
384 write_memory (addr, buf, len);
387 /* Store VALUE at ADDR in the inferior as a LEN-byte signed
390 write_memory_signed_integer (CORE_ADDR addr, int len,
391 enum bfd_endian byte_order,
394 gdb_byte *buf = alloca (len);
396 store_signed_integer (buf, len, byte_order, value);
397 write_memory (addr, buf, len);
400 /* The current default bfd target. Points to storage allocated for
404 /* Same thing, except it is "auto" not NULL for the default case. */
405 static char *gnutarget_string;
407 show_gnutarget_string (struct ui_file *file, int from_tty,
408 struct cmd_list_element *c,
411 fprintf_filtered (file,
412 _("The current BFD target is \"%s\".\n"), value);
415 static void set_gnutarget_command (char *, int,
416 struct cmd_list_element *);
419 set_gnutarget_command (char *ignore, int from_tty,
420 struct cmd_list_element *c)
422 if (strcmp (gnutarget_string, "auto") == 0)
425 gnutarget = gnutarget_string;
428 /* Set the gnutarget. */
430 set_gnutarget (char *newtarget)
432 if (gnutarget_string != NULL)
433 xfree (gnutarget_string);
434 gnutarget_string = xstrdup (newtarget);
435 set_gnutarget_command (NULL, 0, NULL);
439 _initialize_core (void)
441 struct cmd_list_element *c;
443 c = add_cmd ("core-file", class_files, core_file_command, _("\
444 Use FILE as core dump for examining memory and registers.\n\
445 No arg means have no core file. This command has been superseded by the\n\
446 `target core' and `detach' commands."), &cmdlist);
447 set_cmd_completer (c, filename_completer);
450 add_setshow_string_noescape_cmd ("gnutarget", class_files,
451 &gnutarget_string, _("\
452 Set the current BFD target."), _("\
453 Show the current BFD target."), _("\
454 Use `set gnutarget auto' to specify automatic detection."),
455 set_gnutarget_command,
456 show_gnutarget_string,
457 &setlist, &showlist);
458 add_alias_cmd ("g", "gnutarget", class_files, 1, &setlist);
460 if (getenv ("GNUTARGET"))
461 set_gnutarget (getenv ("GNUTARGET"));
463 set_gnutarget ("auto");