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_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 /* Same as target_read_code, but report an error if can't read. */
282 read_code (CORE_ADDR memaddr
, gdb_byte
*myaddr
, ssize_t len
)
286 status
= target_read_code (memaddr
, myaddr
, len
);
288 memory_error (status
, memaddr
);
291 /* Argument / return result struct for use with
292 do_captured_read_memory_integer(). MEMADDR and LEN are filled in
293 by gdb_read_memory_integer(). RESULT is the contents that were
294 successfully read from MEMADDR of length LEN. */
296 struct captured_read_memory_integer_arguments
300 enum bfd_endian byte_order
;
304 /* Helper function for gdb_read_memory_integer(). DATA must be a
305 pointer to a captured_read_memory_integer_arguments struct.
306 Return 1 if successful. Note that the catch_errors() interface
307 will return 0 if an error occurred while reading memory. This
308 choice of return code is so that we can distinguish between
309 success and failure. */
312 do_captured_read_memory_integer (void *data
)
314 struct captured_read_memory_integer_arguments
*args
315 = (struct captured_read_memory_integer_arguments
*) data
;
316 CORE_ADDR memaddr
= args
->memaddr
;
318 enum bfd_endian byte_order
= args
->byte_order
;
320 args
->result
= read_memory_integer (memaddr
, len
, byte_order
);
325 /* Read memory at MEMADDR of length LEN and put the contents in
326 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
330 safe_read_memory_integer (CORE_ADDR memaddr
, int len
,
331 enum bfd_endian byte_order
,
332 LONGEST
*return_value
)
335 struct captured_read_memory_integer_arguments args
;
337 args
.memaddr
= memaddr
;
339 args
.byte_order
= byte_order
;
341 status
= catch_errors (do_captured_read_memory_integer
, &args
,
342 "", RETURN_MASK_ALL
);
344 *return_value
= args
.result
;
350 read_memory_integer (CORE_ADDR memaddr
, int len
,
351 enum bfd_endian byte_order
)
353 gdb_byte buf
[sizeof (LONGEST
)];
355 read_memory (memaddr
, buf
, len
);
356 return extract_signed_integer (buf
, len
, byte_order
);
360 read_memory_unsigned_integer (CORE_ADDR memaddr
, int len
,
361 enum bfd_endian byte_order
)
363 gdb_byte buf
[sizeof (ULONGEST
)];
365 read_memory (memaddr
, buf
, len
);
366 return extract_unsigned_integer (buf
, len
, byte_order
);
370 read_code_integer (CORE_ADDR memaddr
, int len
,
371 enum bfd_endian byte_order
)
373 gdb_byte buf
[sizeof (LONGEST
)];
375 read_code (memaddr
, buf
, len
);
376 return extract_signed_integer (buf
, len
, byte_order
);
380 read_code_unsigned_integer (CORE_ADDR memaddr
, int len
,
381 enum bfd_endian byte_order
)
383 gdb_byte buf
[sizeof (ULONGEST
)];
385 read_code (memaddr
, buf
, len
);
386 return extract_unsigned_integer (buf
, len
, byte_order
);
390 read_memory_string (CORE_ADDR memaddr
, char *buffer
, int max_len
)
399 if (cp
- buffer
>= max_len
)
401 buffer
[max_len
- 1] = '\0';
404 cnt
= max_len
- (cp
- buffer
);
407 read_memory (memaddr
+ (int) (cp
- buffer
), (gdb_byte
*) cp
, cnt
);
408 for (i
= 0; i
< cnt
&& *cp
; i
++, cp
++)
417 read_memory_typed_address (CORE_ADDR addr
, struct type
*type
)
419 gdb_byte
*buf
= alloca (TYPE_LENGTH (type
));
421 read_memory (addr
, buf
, TYPE_LENGTH (type
));
422 return extract_typed_address (buf
, type
);
425 /* Same as target_write_memory, but report an error if can't
428 write_memory (CORE_ADDR memaddr
,
429 const bfd_byte
*myaddr
, ssize_t len
)
433 status
= target_write_memory (memaddr
, myaddr
, len
);
435 memory_error (status
, memaddr
);
438 /* Same as write_memory, but notify 'memory_changed' observers. */
441 write_memory_with_notification (CORE_ADDR memaddr
, const bfd_byte
*myaddr
,
444 write_memory (memaddr
, myaddr
, len
);
445 observer_notify_memory_changed (current_inferior (), memaddr
, len
, myaddr
);
448 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned
451 write_memory_unsigned_integer (CORE_ADDR addr
, int len
,
452 enum bfd_endian byte_order
,
455 gdb_byte
*buf
= alloca (len
);
457 store_unsigned_integer (buf
, len
, byte_order
, value
);
458 write_memory (addr
, buf
, len
);
461 /* Store VALUE at ADDR in the inferior as a LEN-byte signed
464 write_memory_signed_integer (CORE_ADDR addr
, int len
,
465 enum bfd_endian byte_order
,
468 gdb_byte
*buf
= alloca (len
);
470 store_signed_integer (buf
, len
, byte_order
, value
);
471 write_memory (addr
, buf
, len
);
474 /* The current default bfd target. Points to storage allocated for
478 /* Same thing, except it is "auto" not NULL for the default case. */
479 static char *gnutarget_string
;
481 show_gnutarget_string (struct ui_file
*file
, int from_tty
,
482 struct cmd_list_element
*c
,
485 fprintf_filtered (file
,
486 _("The current BFD target is \"%s\".\n"), value
);
489 static void set_gnutarget_command (char *, int,
490 struct cmd_list_element
*);
493 set_gnutarget_command (char *ignore
, int from_tty
,
494 struct cmd_list_element
*c
)
496 char *gend
= gnutarget_string
+ strlen (gnutarget_string
);
498 gend
= remove_trailing_whitespace (gnutarget_string
, gend
);
501 if (strcmp (gnutarget_string
, "auto") == 0)
504 gnutarget
= gnutarget_string
;
507 /* A completion function for "set gnutarget". */
509 static VEC (char_ptr
) *
510 complete_set_gnutarget (struct cmd_list_element
*cmd
,
511 const char *text
, const char *word
)
513 static const char **bfd_targets
;
515 if (bfd_targets
== NULL
)
519 bfd_targets
= bfd_target_list ();
520 for (last
= 0; bfd_targets
[last
] != NULL
; ++last
)
523 bfd_targets
= xrealloc (bfd_targets
, (last
+ 2) * sizeof (const char **));
524 bfd_targets
[last
] = "auto";
525 bfd_targets
[last
+ 1] = NULL
;
528 return complete_on_enum (bfd_targets
, text
, word
);
531 /* Set the gnutarget. */
533 set_gnutarget (char *newtarget
)
535 if (gnutarget_string
!= NULL
)
536 xfree (gnutarget_string
);
537 gnutarget_string
= xstrdup (newtarget
);
538 set_gnutarget_command (NULL
, 0, NULL
);
542 _initialize_core (void)
544 struct cmd_list_element
*c
;
546 c
= add_cmd ("core-file", class_files
, core_file_command
, _("\
547 Use FILE as core dump for examining memory and registers.\n\
548 No arg means have no core file. This command has been superseded by the\n\
549 `target core' and `detach' commands."), &cmdlist
);
550 set_cmd_completer (c
, filename_completer
);
553 c
= add_setshow_string_noescape_cmd ("gnutarget", class_files
,
554 &gnutarget_string
, _("\
555 Set the current BFD target."), _("\
556 Show the current BFD target."), _("\
557 Use `set gnutarget auto' to specify automatic detection."),
558 set_gnutarget_command
,
559 show_gnutarget_string
,
560 &setlist
, &showlist
);
561 set_cmd_completer (c
, complete_set_gnutarget
);
563 add_alias_cmd ("g", "gnutarget", class_files
, 1, &setlist
);
565 if (getenv ("GNUTARGET"))
566 set_gnutarget (getenv ("GNUTARGET"));
568 set_gnutarget ("auto");