1 /* Core dump and executable file functions above target vector, for GDB.
3 Copyright (C) 1986-2014 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/>. */
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_status 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_status: %s (%s)",
213 target_xfer_status_to_string (err
),
218 /* Report a memory error by throwing a suitable exception. */
221 memory_error (enum target_xfer_status err
, CORE_ADDR memaddr
)
224 enum errors exception
= GDB_NO_ERROR
;
226 /* Build error string. */
227 str
= memory_error_message (err
, target_gdbarch (), memaddr
);
228 make_cleanup (xfree
, str
);
230 /* Choose the right error to throw. */
233 case TARGET_XFER_E_IO
:
234 exception
= MEMORY_ERROR
;
236 case TARGET_XFER_E_UNAVAILABLE
:
237 exception
= NOT_AVAILABLE_ERROR
;
242 throw_error (exception
, ("%s"), str
);
245 /* Same as target_read_memory, but report an error if can't read. */
248 read_memory (CORE_ADDR memaddr
, gdb_byte
*myaddr
, ssize_t len
)
254 enum target_xfer_status status
;
257 status
= target_xfer_partial (current_target
.beneath
,
258 TARGET_OBJECT_MEMORY
, NULL
,
259 myaddr
+ xfered
, NULL
,
260 memaddr
+ xfered
, len
- xfered
,
263 if (status
== TARGET_XFER_EOF
)
264 memory_error (TARGET_XFER_E_IO
, memaddr
+ xfered
);
266 if (TARGET_XFER_STATUS_ERROR_P (status
))
267 memory_error (status
, memaddr
+ xfered
);
269 gdb_assert (status
== TARGET_XFER_OK
);
270 xfered
+= xfered_len
;
275 /* Same as target_read_stack, but report an error if can't read. */
278 read_stack (CORE_ADDR memaddr
, gdb_byte
*myaddr
, ssize_t len
)
282 status
= target_read_stack (memaddr
, myaddr
, len
);
284 memory_error (status
, memaddr
);
287 /* Same as target_read_code, but report an error if can't read. */
290 read_code (CORE_ADDR memaddr
, gdb_byte
*myaddr
, ssize_t len
)
294 status
= target_read_code (memaddr
, myaddr
, len
);
296 memory_error (status
, memaddr
);
299 /* Argument / return result struct for use with
300 do_captured_read_memory_integer(). MEMADDR and LEN are filled in
301 by gdb_read_memory_integer(). RESULT is the contents that were
302 successfully read from MEMADDR of length LEN. */
304 struct captured_read_memory_integer_arguments
308 enum bfd_endian byte_order
;
312 /* Helper function for gdb_read_memory_integer(). DATA must be a
313 pointer to a captured_read_memory_integer_arguments struct.
314 Return 1 if successful. Note that the catch_errors() interface
315 will return 0 if an error occurred while reading memory. This
316 choice of return code is so that we can distinguish between
317 success and failure. */
320 do_captured_read_memory_integer (void *data
)
322 struct captured_read_memory_integer_arguments
*args
323 = (struct captured_read_memory_integer_arguments
*) data
;
324 CORE_ADDR memaddr
= args
->memaddr
;
326 enum bfd_endian byte_order
= args
->byte_order
;
328 args
->result
= read_memory_integer (memaddr
, len
, byte_order
);
333 /* Read memory at MEMADDR of length LEN and put the contents in
334 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
338 safe_read_memory_integer (CORE_ADDR memaddr
, int len
,
339 enum bfd_endian byte_order
,
340 LONGEST
*return_value
)
343 struct captured_read_memory_integer_arguments args
;
345 args
.memaddr
= memaddr
;
347 args
.byte_order
= byte_order
;
349 status
= catch_errors (do_captured_read_memory_integer
, &args
,
350 "", RETURN_MASK_ALL
);
352 *return_value
= args
.result
;
358 read_memory_integer (CORE_ADDR memaddr
, int len
,
359 enum bfd_endian byte_order
)
361 gdb_byte buf
[sizeof (LONGEST
)];
363 read_memory (memaddr
, buf
, len
);
364 return extract_signed_integer (buf
, len
, byte_order
);
368 read_memory_unsigned_integer (CORE_ADDR memaddr
, int len
,
369 enum bfd_endian byte_order
)
371 gdb_byte buf
[sizeof (ULONGEST
)];
373 read_memory (memaddr
, buf
, len
);
374 return extract_unsigned_integer (buf
, len
, byte_order
);
378 read_code_integer (CORE_ADDR memaddr
, int len
,
379 enum bfd_endian byte_order
)
381 gdb_byte buf
[sizeof (LONGEST
)];
383 read_code (memaddr
, buf
, len
);
384 return extract_signed_integer (buf
, len
, byte_order
);
388 read_code_unsigned_integer (CORE_ADDR memaddr
, int len
,
389 enum bfd_endian byte_order
)
391 gdb_byte buf
[sizeof (ULONGEST
)];
393 read_code (memaddr
, buf
, len
);
394 return extract_unsigned_integer (buf
, len
, byte_order
);
398 read_memory_string (CORE_ADDR memaddr
, char *buffer
, int max_len
)
407 if (cp
- buffer
>= max_len
)
409 buffer
[max_len
- 1] = '\0';
412 cnt
= max_len
- (cp
- buffer
);
415 read_memory (memaddr
+ (int) (cp
- buffer
), (gdb_byte
*) cp
, cnt
);
416 for (i
= 0; i
< cnt
&& *cp
; i
++, cp
++)
425 read_memory_typed_address (CORE_ADDR addr
, struct type
*type
)
427 gdb_byte
*buf
= alloca (TYPE_LENGTH (type
));
429 read_memory (addr
, buf
, TYPE_LENGTH (type
));
430 return extract_typed_address (buf
, type
);
433 /* Same as target_write_memory, but report an error if can't
436 write_memory (CORE_ADDR memaddr
,
437 const bfd_byte
*myaddr
, ssize_t len
)
441 status
= target_write_memory (memaddr
, myaddr
, len
);
443 memory_error (status
, memaddr
);
446 /* Same as write_memory, but notify 'memory_changed' observers. */
449 write_memory_with_notification (CORE_ADDR memaddr
, const bfd_byte
*myaddr
,
452 write_memory (memaddr
, myaddr
, len
);
453 observer_notify_memory_changed (current_inferior (), memaddr
, len
, myaddr
);
456 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned
459 write_memory_unsigned_integer (CORE_ADDR addr
, int len
,
460 enum bfd_endian byte_order
,
463 gdb_byte
*buf
= alloca (len
);
465 store_unsigned_integer (buf
, len
, byte_order
, value
);
466 write_memory (addr
, buf
, len
);
469 /* Store VALUE at ADDR in the inferior as a LEN-byte signed
472 write_memory_signed_integer (CORE_ADDR addr
, int len
,
473 enum bfd_endian byte_order
,
476 gdb_byte
*buf
= alloca (len
);
478 store_signed_integer (buf
, len
, byte_order
, value
);
479 write_memory (addr
, buf
, len
);
482 /* The current default bfd target. Points to storage allocated for
486 /* Same thing, except it is "auto" not NULL for the default case. */
487 static char *gnutarget_string
;
489 show_gnutarget_string (struct ui_file
*file
, int from_tty
,
490 struct cmd_list_element
*c
,
493 fprintf_filtered (file
,
494 _("The current BFD target is \"%s\".\n"), value
);
497 static void set_gnutarget_command (char *, int,
498 struct cmd_list_element
*);
501 set_gnutarget_command (char *ignore
, int from_tty
,
502 struct cmd_list_element
*c
)
504 char *gend
= gnutarget_string
+ strlen (gnutarget_string
);
506 gend
= remove_trailing_whitespace (gnutarget_string
, gend
);
509 if (strcmp (gnutarget_string
, "auto") == 0)
512 gnutarget
= gnutarget_string
;
515 /* A completion function for "set gnutarget". */
517 static VEC (char_ptr
) *
518 complete_set_gnutarget (struct cmd_list_element
*cmd
,
519 const char *text
, const char *word
)
521 static const char **bfd_targets
;
523 if (bfd_targets
== NULL
)
527 bfd_targets
= bfd_target_list ();
528 for (last
= 0; bfd_targets
[last
] != NULL
; ++last
)
531 bfd_targets
= xrealloc (bfd_targets
, (last
+ 2) * sizeof (const char **));
532 bfd_targets
[last
] = "auto";
533 bfd_targets
[last
+ 1] = NULL
;
536 return complete_on_enum (bfd_targets
, text
, word
);
539 /* Set the gnutarget. */
541 set_gnutarget (char *newtarget
)
543 if (gnutarget_string
!= NULL
)
544 xfree (gnutarget_string
);
545 gnutarget_string
= xstrdup (newtarget
);
546 set_gnutarget_command (NULL
, 0, NULL
);
550 _initialize_core (void)
552 struct cmd_list_element
*c
;
554 c
= add_cmd ("core-file", class_files
, core_file_command
, _("\
555 Use FILE as core dump for examining memory and registers.\n\
556 No arg means have no core file. This command has been superseded by the\n\
557 `target core' and `detach' commands."), &cmdlist
);
558 set_cmd_completer (c
, filename_completer
);
561 c
= add_setshow_string_noescape_cmd ("gnutarget", class_files
,
562 &gnutarget_string
, _("\
563 Set the current BFD target."), _("\
564 Show the current BFD target."), _("\
565 Use `set gnutarget auto' to specify automatic detection."),
566 set_gnutarget_command
,
567 show_gnutarget_string
,
568 &setlist
, &showlist
);
569 set_cmd_completer (c
, complete_set_gnutarget
);
571 add_alias_cmd ("g", "gnutarget", class_files
, 1, &setlist
);
573 if (getenv ("GNUTARGET"))
574 set_gnutarget (getenv ("GNUTARGET"));
576 set_gnutarget ("auto");