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 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 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 make_cleanup (xfree
, filename
);
165 mtime
= bfd_get_mtime (exec_bfd
);
166 res
= stat (filename
, &st
);
168 if (mtime
&& mtime
!= st
.st_mtime
)
169 exec_file_attach (filename
, 0);
173 /* If we have both a core file and an exec file,
174 print a warning if they don't go together. */
177 validate_files (void)
179 if (exec_bfd
&& core_bfd
)
181 if (!core_file_matches_executable_p (core_bfd
, exec_bfd
))
182 warning (_("core file may not match specified executable file."));
183 else if (bfd_get_mtime (exec_bfd
) > bfd_get_mtime (core_bfd
))
184 warning (_("exec file is newer than core file."));
188 /* Return the name of the executable file as a string.
189 ERR nonzero means get error if there is none specified;
190 otherwise return 0 in that case. */
193 get_exec_file (int err
)
196 return bfd_get_filename (exec_bfd
);
200 error (_("No executable file specified.\n\
201 Use the \"file\" or \"exec-file\" command."));
206 /* Report a memory error with error(). */
209 memory_error (int status
, CORE_ADDR memaddr
)
211 struct ui_file
*tmp_stream
= mem_fileopen ();
212 make_cleanup_ui_file_delete (tmp_stream
);
216 /* Actually, address between memaddr and memaddr + len
217 was out of bounds. */
218 fprintf_unfiltered (tmp_stream
, "Cannot access memory at address ");
219 deprecated_print_address_numeric (memaddr
, 1, tmp_stream
);
223 fprintf_filtered (tmp_stream
, "Error accessing memory address ");
224 deprecated_print_address_numeric (memaddr
, 1, tmp_stream
);
225 fprintf_filtered (tmp_stream
, ": %s.",
226 safe_strerror (status
));
229 error_stream (tmp_stream
);
232 /* Same as target_read_memory, but report an error if can't read. */
234 read_memory (CORE_ADDR memaddr
, gdb_byte
*myaddr
, int len
)
237 status
= target_read_memory (memaddr
, myaddr
, len
);
239 memory_error (status
, memaddr
);
242 /* Argument / return result struct for use with
243 do_captured_read_memory_integer(). MEMADDR and LEN are filled in
244 by gdb_read_memory_integer(). RESULT is the contents that were
245 successfully read from MEMADDR of length LEN. */
247 struct captured_read_memory_integer_arguments
254 /* Helper function for gdb_read_memory_integer(). DATA must be a
255 pointer to a captured_read_memory_integer_arguments struct.
256 Return 1 if successful. Note that the catch_errors() interface
257 will return 0 if an error occurred while reading memory. This
258 choice of return code is so that we can distinguish between
259 success and failure. */
262 do_captured_read_memory_integer (void *data
)
264 struct captured_read_memory_integer_arguments
*args
= (struct captured_read_memory_integer_arguments
*) data
;
265 CORE_ADDR memaddr
= args
->memaddr
;
268 args
->result
= read_memory_integer (memaddr
, len
);
273 /* Read memory at MEMADDR of length LEN and put the contents in
274 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
278 safe_read_memory_integer (CORE_ADDR memaddr
, int len
, LONGEST
*return_value
)
281 struct captured_read_memory_integer_arguments args
;
282 args
.memaddr
= memaddr
;
285 status
= catch_errors (do_captured_read_memory_integer
, &args
,
286 "", RETURN_MASK_ALL
);
288 *return_value
= args
.result
;
294 read_memory_integer (CORE_ADDR memaddr
, int len
)
296 gdb_byte buf
[sizeof (LONGEST
)];
298 read_memory (memaddr
, buf
, len
);
299 return extract_signed_integer (buf
, len
);
303 read_memory_unsigned_integer (CORE_ADDR memaddr
, int len
)
305 gdb_byte buf
[sizeof (ULONGEST
)];
307 read_memory (memaddr
, buf
, len
);
308 return extract_unsigned_integer (buf
, len
);
312 read_memory_string (CORE_ADDR memaddr
, char *buffer
, int max_len
)
321 if (cp
- buffer
>= max_len
)
323 buffer
[max_len
- 1] = '\0';
326 cnt
= max_len
- (cp
- buffer
);
329 read_memory (memaddr
+ (int) (cp
- buffer
), cp
, cnt
);
330 for (i
= 0; i
< cnt
&& *cp
; i
++, cp
++)
339 read_memory_typed_address (CORE_ADDR addr
, struct type
*type
)
341 gdb_byte
*buf
= alloca (TYPE_LENGTH (type
));
342 read_memory (addr
, buf
, TYPE_LENGTH (type
));
343 return extract_typed_address (buf
, type
);
346 /* Same as target_write_memory, but report an error if can't write. */
348 write_memory (CORE_ADDR memaddr
, const bfd_byte
*myaddr
, int len
)
351 gdb_byte
*bytes
= alloca (len
);
353 memcpy (bytes
, myaddr
, len
);
354 status
= target_write_memory (memaddr
, bytes
, len
);
356 memory_error (status
, memaddr
);
359 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned integer. */
361 write_memory_unsigned_integer (CORE_ADDR addr
, int len
, ULONGEST value
)
363 gdb_byte
*buf
= alloca (len
);
364 store_unsigned_integer (buf
, len
, value
);
365 write_memory (addr
, buf
, len
);
368 /* Store VALUE at ADDR in the inferior as a LEN-byte signed integer. */
370 write_memory_signed_integer (CORE_ADDR addr
, int len
, LONGEST value
)
372 gdb_byte
*buf
= alloca (len
);
373 store_signed_integer (buf
, len
, value
);
374 write_memory (addr
, buf
, len
);
380 /* Enable after 4.12. It is not tested. */
382 /* Search code. Targets can just make this their search function, or
383 if the protocol has a less general search function, they can call this
384 in the cases it can't handle. */
386 generic_search (int len
, char *data
, char *mask
, CORE_ADDR startaddr
,
387 int increment
, CORE_ADDR lorange
, CORE_ADDR hirange
,
388 CORE_ADDR
*addr_found
, char *data_found
)
391 CORE_ADDR curaddr
= startaddr
;
393 while (curaddr
>= lorange
&& curaddr
< hirange
)
395 read_memory (curaddr
, data_found
, len
);
396 for (i
= 0; i
< len
; ++i
)
397 if ((data_found
[i
] & mask
[i
]) != data
[i
])
400 *addr_found
= curaddr
;
404 curaddr
+= increment
;
406 *addr_found
= (CORE_ADDR
) 0;
411 /* The current default bfd target. Points to storage allocated for
415 /* Same thing, except it is "auto" not NULL for the default case. */
416 static char *gnutarget_string
;
418 show_gnutarget_string (struct ui_file
*file
, int from_tty
,
419 struct cmd_list_element
*c
, const char *value
)
421 fprintf_filtered (file
, _("The current BFD target is \"%s\".\n"), value
);
424 static void set_gnutarget_command (char *, int, struct cmd_list_element
*);
427 set_gnutarget_command (char *ignore
, int from_tty
, struct cmd_list_element
*c
)
429 if (strcmp (gnutarget_string
, "auto") == 0)
432 gnutarget
= gnutarget_string
;
435 /* Set the gnutarget. */
437 set_gnutarget (char *newtarget
)
439 if (gnutarget_string
!= NULL
)
440 xfree (gnutarget_string
);
441 gnutarget_string
= savestring (newtarget
, strlen (newtarget
));
442 set_gnutarget_command (NULL
, 0, NULL
);
446 _initialize_core (void)
448 struct cmd_list_element
*c
;
449 c
= add_cmd ("core-file", class_files
, core_file_command
, _("\
450 Use FILE as core dump for examining memory and registers.\n\
451 No arg means have no core file. This command has been superseded by the\n\
452 `target core' and `detach' commands."), &cmdlist
);
453 set_cmd_completer (c
, filename_completer
);
456 add_setshow_string_noescape_cmd ("gnutarget", class_files
,
457 &gnutarget_string
, _("(\
458 Set the current BFD target."), _("\
459 Show the current BFD target."), _("\
460 Use `set gnutarget auto' to specify automatic detection."),
461 set_gnutarget_command
,
462 show_gnutarget_string
,
463 &setlist
, &showlist
);
465 if (getenv ("GNUTARGET"))
466 set_gnutarget (getenv ("GNUTARGET"));
468 set_gnutarget ("auto");