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"
37 #include "cli/cli-utils.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
58 static int exec_file_hook_count
= 0; /* Size of array. */
60 /* Binary file diddling handle for the core file. */
64 /* corelow.c target. It is never NULL after GDB initialization. */
66 struct target_ops
*core_target
;
69 /* Backward compatability with old way of specifying core files. */
72 core_file_command (char *filename
, int from_tty
)
74 dont_repeat (); /* Either way, seems bogus. */
76 gdb_assert (core_target
!= NULL
);
79 (core_target
->to_detach
) (core_target
, filename
, from_tty
);
81 (core_target
->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
114 exec_file_extra_hooks
= (hook_type
*)
115 xmalloc (sizeof (hook_type
));
116 exec_file_extra_hooks
[0] = deprecated_exec_file_display_hook
;
117 deprecated_exec_file_display_hook
= call_extra_exec_file_hooks
;
118 exec_file_hook_count
= 1;
121 /* Grow the hook array by one and add the new hook to the end.
122 Yes, it's inefficient to grow it by one each time but since
123 this is hardly ever called it's not a big deal. */
124 exec_file_hook_count
++;
125 new_array
= (hook_type
*)
126 xrealloc (exec_file_extra_hooks
,
127 exec_file_hook_count
* sizeof (hook_type
));
128 exec_file_extra_hooks
= new_array
;
129 exec_file_extra_hooks
[exec_file_hook_count
- 1] = hook
;
132 deprecated_exec_file_display_hook
= hook
;
136 reopen_exec_file (void)
141 struct cleanup
*cleanups
;
143 /* Don't do anything if there isn't an exec file. */
144 if (exec_bfd
== NULL
)
147 /* If the timestamp of the exec file has changed, reopen it. */
148 filename
= xstrdup (bfd_get_filename (exec_bfd
));
149 cleanups
= make_cleanup (xfree
, filename
);
150 res
= stat (filename
, &st
);
152 if (exec_bfd_mtime
&& exec_bfd_mtime
!= st
.st_mtime
)
153 exec_file_attach (filename
, 0);
155 /* If we accessed the file since last opening it, close it now;
156 this stops GDB from holding the executable open after it
158 bfd_cache_close_all ();
160 do_cleanups (cleanups
);
163 /* If we have both a core file and an exec file,
164 print a warning if they don't go together. */
167 validate_files (void)
169 if (exec_bfd
&& core_bfd
)
171 if (!core_file_matches_executable_p (core_bfd
, exec_bfd
))
172 warning (_("core file may not match specified executable file."));
173 else if (bfd_get_mtime (exec_bfd
) > bfd_get_mtime (core_bfd
))
174 warning (_("exec file is newer than core file."));
178 /* Return the name of the executable file as a string.
179 ERR nonzero means get error if there is none specified;
180 otherwise return 0 in that case. */
183 get_exec_file (int err
)
186 return exec_filename
;
190 error (_("No executable file specified.\n\
191 Use the \"file\" or \"exec-file\" command."));
197 memory_error_message (enum target_xfer_error err
,
198 struct gdbarch
*gdbarch
, CORE_ADDR memaddr
)
202 case TARGET_XFER_E_IO
:
203 /* Actually, address between memaddr and memaddr + len was out of
205 return xstrprintf (_("Cannot access memory at address %s"),
206 paddress (gdbarch
, memaddr
));
207 case TARGET_XFER_E_UNAVAILABLE
:
208 return xstrprintf (_("Memory at address %s unavailable."),
209 paddress (gdbarch
, memaddr
));
211 internal_error (__FILE__
, __LINE__
,
212 "unhandled target_xfer_error: %s (%s)",
213 target_xfer_error_to_string (err
),
218 /* Report a memory error by throwing a suitable exception. */
221 memory_error (enum target_xfer_error err
, CORE_ADDR memaddr
)
225 /* Build error string. */
226 str
= memory_error_message (err
, target_gdbarch (), memaddr
);
227 make_cleanup (xfree
, str
);
229 /* Choose the right error to throw. */
232 case TARGET_XFER_E_IO
:
235 case TARGET_XFER_E_UNAVAILABLE
:
236 err
= NOT_AVAILABLE_ERROR
;
241 throw_error (err
, ("%s"), str
);
244 /* Same as target_read_memory, but report an error if can't read. */
247 read_memory (CORE_ADDR memaddr
, gdb_byte
*myaddr
, ssize_t len
)
253 LONGEST xfer
= target_xfer_partial (current_target
.beneath
,
254 TARGET_OBJECT_MEMORY
, NULL
,
255 myaddr
+ xfered
, NULL
,
256 memaddr
+ xfered
, len
- xfered
);
259 memory_error (TARGET_XFER_E_IO
, memaddr
+ xfered
);
261 memory_error (xfer
, memaddr
+ xfered
);
267 /* Same as target_read_stack, but report an error if can't read. */
270 read_stack (CORE_ADDR memaddr
, gdb_byte
*myaddr
, ssize_t len
)
274 status
= target_read_stack (memaddr
, myaddr
, len
);
276 memory_error (status
, memaddr
);
279 /* Argument / return result struct for use with
280 do_captured_read_memory_integer(). MEMADDR and LEN are filled in
281 by gdb_read_memory_integer(). RESULT is the contents that were
282 successfully read from MEMADDR of length LEN. */
284 struct captured_read_memory_integer_arguments
288 enum bfd_endian byte_order
;
292 /* Helper function for gdb_read_memory_integer(). DATA must be a
293 pointer to a captured_read_memory_integer_arguments struct.
294 Return 1 if successful. Note that the catch_errors() interface
295 will return 0 if an error occurred while reading memory. This
296 choice of return code is so that we can distinguish between
297 success and failure. */
300 do_captured_read_memory_integer (void *data
)
302 struct captured_read_memory_integer_arguments
*args
303 = (struct captured_read_memory_integer_arguments
*) data
;
304 CORE_ADDR memaddr
= args
->memaddr
;
306 enum bfd_endian byte_order
= args
->byte_order
;
308 args
->result
= read_memory_integer (memaddr
, len
, byte_order
);
313 /* Read memory at MEMADDR of length LEN and put the contents in
314 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
318 safe_read_memory_integer (CORE_ADDR memaddr
, int len
,
319 enum bfd_endian byte_order
,
320 LONGEST
*return_value
)
323 struct captured_read_memory_integer_arguments args
;
325 args
.memaddr
= memaddr
;
327 args
.byte_order
= byte_order
;
329 status
= catch_errors (do_captured_read_memory_integer
, &args
,
330 "", RETURN_MASK_ALL
);
332 *return_value
= args
.result
;
338 read_memory_integer (CORE_ADDR memaddr
, int len
,
339 enum bfd_endian byte_order
)
341 gdb_byte buf
[sizeof (LONGEST
)];
343 read_memory (memaddr
, buf
, len
);
344 return extract_signed_integer (buf
, len
, byte_order
);
348 read_memory_unsigned_integer (CORE_ADDR memaddr
, int len
,
349 enum bfd_endian byte_order
)
351 gdb_byte buf
[sizeof (ULONGEST
)];
353 read_memory (memaddr
, buf
, len
);
354 return extract_unsigned_integer (buf
, len
, byte_order
);
358 read_memory_string (CORE_ADDR memaddr
, char *buffer
, int max_len
)
367 if (cp
- buffer
>= max_len
)
369 buffer
[max_len
- 1] = '\0';
372 cnt
= max_len
- (cp
- buffer
);
375 read_memory (memaddr
+ (int) (cp
- buffer
), (gdb_byte
*) cp
, cnt
);
376 for (i
= 0; i
< cnt
&& *cp
; i
++, cp
++)
385 read_memory_typed_address (CORE_ADDR addr
, struct type
*type
)
387 gdb_byte
*buf
= alloca (TYPE_LENGTH (type
));
389 read_memory (addr
, buf
, TYPE_LENGTH (type
));
390 return extract_typed_address (buf
, type
);
393 /* Same as target_write_memory, but report an error if can't
396 write_memory (CORE_ADDR memaddr
,
397 const bfd_byte
*myaddr
, ssize_t len
)
401 status
= target_write_memory (memaddr
, myaddr
, len
);
403 memory_error (status
, memaddr
);
406 /* Same as write_memory, but notify 'memory_changed' observers. */
409 write_memory_with_notification (CORE_ADDR memaddr
, const bfd_byte
*myaddr
,
412 write_memory (memaddr
, myaddr
, len
);
413 observer_notify_memory_changed (current_inferior (), memaddr
, len
, myaddr
);
416 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned
419 write_memory_unsigned_integer (CORE_ADDR addr
, int len
,
420 enum bfd_endian byte_order
,
423 gdb_byte
*buf
= alloca (len
);
425 store_unsigned_integer (buf
, len
, byte_order
, value
);
426 write_memory (addr
, buf
, len
);
429 /* Store VALUE at ADDR in the inferior as a LEN-byte signed
432 write_memory_signed_integer (CORE_ADDR addr
, int len
,
433 enum bfd_endian byte_order
,
436 gdb_byte
*buf
= alloca (len
);
438 store_signed_integer (buf
, len
, byte_order
, value
);
439 write_memory (addr
, buf
, len
);
442 /* The current default bfd target. Points to storage allocated for
446 /* Same thing, except it is "auto" not NULL for the default case. */
447 static char *gnutarget_string
;
449 show_gnutarget_string (struct ui_file
*file
, int from_tty
,
450 struct cmd_list_element
*c
,
453 fprintf_filtered (file
,
454 _("The current BFD target is \"%s\".\n"), value
);
457 static void set_gnutarget_command (char *, int,
458 struct cmd_list_element
*);
461 set_gnutarget_command (char *ignore
, int from_tty
,
462 struct cmd_list_element
*c
)
464 char *gend
= gnutarget_string
+ strlen (gnutarget_string
);
466 gend
= remove_trailing_whitespace (gnutarget_string
, gend
);
469 if (strcmp (gnutarget_string
, "auto") == 0)
472 gnutarget
= gnutarget_string
;
475 /* A completion function for "set gnutarget". */
477 static VEC (char_ptr
) *
478 complete_set_gnutarget (struct cmd_list_element
*cmd
,
479 const char *text
, const char *word
)
481 static const char **bfd_targets
;
483 if (bfd_targets
== NULL
)
487 bfd_targets
= bfd_target_list ();
488 for (last
= 0; bfd_targets
[last
] != NULL
; ++last
)
491 bfd_targets
= xrealloc (bfd_targets
, (last
+ 2) * sizeof (const char **));
492 bfd_targets
[last
] = "auto";
493 bfd_targets
[last
+ 1] = NULL
;
496 return complete_on_enum (bfd_targets
, text
, word
);
499 /* Set the gnutarget. */
501 set_gnutarget (char *newtarget
)
503 if (gnutarget_string
!= NULL
)
504 xfree (gnutarget_string
);
505 gnutarget_string
= xstrdup (newtarget
);
506 set_gnutarget_command (NULL
, 0, NULL
);
510 _initialize_core (void)
512 struct cmd_list_element
*c
;
514 c
= add_cmd ("core-file", class_files
, core_file_command
, _("\
515 Use FILE as core dump for examining memory and registers.\n\
516 No arg means have no core file. This command has been superseded by the\n\
517 `target core' and `detach' commands."), &cmdlist
);
518 set_cmd_completer (c
, filename_completer
);
521 c
= add_setshow_string_noescape_cmd ("gnutarget", class_files
,
522 &gnutarget_string
, _("\
523 Set the current BFD target."), _("\
524 Show the current BFD target."), _("\
525 Use `set gnutarget auto' to specify automatic detection."),
526 set_gnutarget_command
,
527 show_gnutarget_string
,
528 &setlist
, &showlist
);
529 set_cmd_completer (c
, complete_set_gnutarget
);
531 add_alias_cmd ("g", "gnutarget", class_files
, 1, &setlist
);
533 if (getenv ("GNUTARGET"))
534 set_gnutarget (getenv ("GNUTARGET"));
536 set_gnutarget ("auto");