1 /* Core dump and executable file functions above target vector, for GDB.
3 Copyright (C) 1986-2017 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/>. */
32 #include "completer.h"
34 #include "cli/cli-utils.h"
36 /* Local function declarations. */
38 extern void _initialize_core (void);
40 /* You can have any number of hooks for `exec_file_command' command to
41 call. If there's only one hook, it is set in exec_file_display
42 hook. If there are two or more hooks, they are set in
43 exec_file_extra_hooks[], and deprecated_exec_file_display_hook is
44 set to a function that calls all of them. This extra complexity is
45 needed to preserve compatibility with old code that assumed that
46 only one hook could be set, and which called
47 deprecated_exec_file_display_hook directly. */
49 typedef void (*hook_type
) (const char *);
51 hook_type deprecated_exec_file_display_hook
; /* The original hook. */
52 static hook_type
*exec_file_extra_hooks
; /* Array of additional
54 static int exec_file_hook_count
= 0; /* Size of array. */
56 /* Binary file diddling handle for the core file. */
60 /* corelow.c target. It is never NULL after GDB initialization. */
62 struct target_ops
*core_target
;
65 /* Backward compatability with old way of specifying core files. */
68 core_file_command (char *filename
, int from_tty
)
70 dont_repeat (); /* Either way, seems bogus. */
72 gdb_assert (core_target
!= NULL
);
75 (core_target
->to_detach
) (core_target
, filename
, from_tty
);
77 (core_target
->to_open
) (filename
, from_tty
);
81 /* If there are two or more functions that wish to hook into
82 exec_file_command, this function will call all of the hook
86 call_extra_exec_file_hooks (const char *filename
)
90 for (i
= 0; i
< exec_file_hook_count
; i
++)
91 (*exec_file_extra_hooks
[i
]) (filename
);
94 /* Call this to specify the hook for exec_file_command to call back.
95 This is called from the x-window display code. */
98 specify_exec_file_hook (void (*hook
) (const char *))
100 hook_type
*new_array
;
102 if (deprecated_exec_file_display_hook
!= NULL
)
104 /* There's already a hook installed. Arrange to have both it
105 and the subsequent hooks called. */
106 if (exec_file_hook_count
== 0)
108 /* If this is the first extra hook, initialize the hook
110 exec_file_extra_hooks
= XNEW (hook_type
);
111 exec_file_extra_hooks
[0] = deprecated_exec_file_display_hook
;
112 deprecated_exec_file_display_hook
= call_extra_exec_file_hooks
;
113 exec_file_hook_count
= 1;
116 /* Grow the hook array by one and add the new hook to the end.
117 Yes, it's inefficient to grow it by one each time but since
118 this is hardly ever called it's not a big deal. */
119 exec_file_hook_count
++;
120 new_array
= (hook_type
*)
121 xrealloc (exec_file_extra_hooks
,
122 exec_file_hook_count
* sizeof (hook_type
));
123 exec_file_extra_hooks
= new_array
;
124 exec_file_extra_hooks
[exec_file_hook_count
- 1] = hook
;
127 deprecated_exec_file_display_hook
= hook
;
131 reopen_exec_file (void)
136 /* Don't do anything if there isn't an exec file. */
137 if (exec_bfd
== NULL
)
140 /* If the timestamp of the exec file has changed, reopen it. */
141 std::string filename
= bfd_get_filename (exec_bfd
);
142 res
= stat (filename
.c_str (), &st
);
144 if (res
== 0 && exec_bfd_mtime
&& exec_bfd_mtime
!= st
.st_mtime
)
145 exec_file_attach (filename
.c_str (), 0);
147 /* If we accessed the file since last opening it, close it now;
148 this stops GDB from holding the executable open after it
150 bfd_cache_close_all ();
153 /* If we have both a core file and an exec file,
154 print a warning if they don't go together. */
157 validate_files (void)
159 if (exec_bfd
&& core_bfd
)
161 if (!core_file_matches_executable_p (core_bfd
, exec_bfd
))
162 warning (_("core file may not match specified executable file."));
163 else if (bfd_get_mtime (exec_bfd
) > bfd_get_mtime (core_bfd
))
164 warning (_("exec file is newer than core file."));
168 /* See common/common-inferior.h. */
171 get_exec_file (int err
)
174 return exec_filename
;
178 error (_("No executable file specified.\n\
179 Use the \"file\" or \"exec-file\" command."));
185 memory_error_message (enum target_xfer_status err
,
186 struct gdbarch
*gdbarch
, CORE_ADDR memaddr
)
190 case TARGET_XFER_E_IO
:
191 /* Actually, address between memaddr and memaddr + len was out of
193 return string_printf (_("Cannot access memory at address %s"),
194 paddress (gdbarch
, memaddr
));
195 case TARGET_XFER_UNAVAILABLE
:
196 return string_printf (_("Memory at address %s unavailable."),
197 paddress (gdbarch
, memaddr
));
199 internal_error (__FILE__
, __LINE__
,
200 "unhandled target_xfer_status: %s (%s)",
201 target_xfer_status_to_string (err
),
206 /* Report a memory error by throwing a suitable exception. */
209 memory_error (enum target_xfer_status err
, CORE_ADDR memaddr
)
211 enum errors exception
= GDB_NO_ERROR
;
213 /* Build error string. */
214 std::string str
= memory_error_message (err
, target_gdbarch (), memaddr
);
216 /* Choose the right error to throw. */
219 case TARGET_XFER_E_IO
:
220 exception
= MEMORY_ERROR
;
222 case TARGET_XFER_UNAVAILABLE
:
223 exception
= NOT_AVAILABLE_ERROR
;
228 throw_error (exception
, ("%s"), str
.c_str ());
231 /* Helper function. */
234 read_memory_object (enum target_object object
, CORE_ADDR memaddr
,
235 gdb_byte
*myaddr
, ssize_t len
)
241 enum target_xfer_status status
;
244 status
= target_xfer_partial (current_target
.beneath
,
246 myaddr
+ xfered
, NULL
,
247 memaddr
+ xfered
, len
- xfered
,
250 if (status
!= TARGET_XFER_OK
)
251 memory_error (status
== TARGET_XFER_EOF
? TARGET_XFER_E_IO
: status
,
254 xfered
+= xfered_len
;
259 /* Same as target_read_memory, but report an error if can't read. */
262 read_memory (CORE_ADDR memaddr
, gdb_byte
*myaddr
, ssize_t len
)
264 read_memory_object (TARGET_OBJECT_MEMORY
, memaddr
, myaddr
, len
);
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
)
272 read_memory_object (TARGET_OBJECT_STACK_MEMORY
, memaddr
, myaddr
, len
);
275 /* Same as target_read_code, but report an error if can't read. */
278 read_code (CORE_ADDR memaddr
, gdb_byte
*myaddr
, ssize_t len
)
280 read_memory_object (TARGET_OBJECT_CODE_MEMORY
, memaddr
, myaddr
, len
);
283 /* Read memory at MEMADDR of length LEN and put the contents in
284 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
288 safe_read_memory_integer (CORE_ADDR memaddr
, int len
,
289 enum bfd_endian byte_order
,
290 LONGEST
*return_value
)
292 gdb_byte buf
[sizeof (LONGEST
)];
294 if (target_read_memory (memaddr
, buf
, len
))
297 *return_value
= extract_signed_integer (buf
, len
, byte_order
);
301 /* Read memory at MEMADDR of length LEN and put the contents in
302 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
306 safe_read_memory_unsigned_integer (CORE_ADDR memaddr
, int len
,
307 enum bfd_endian byte_order
,
308 ULONGEST
*return_value
)
310 gdb_byte buf
[sizeof (ULONGEST
)];
312 if (target_read_memory (memaddr
, buf
, len
))
315 *return_value
= extract_unsigned_integer (buf
, len
, byte_order
);
320 read_memory_integer (CORE_ADDR memaddr
, int len
,
321 enum bfd_endian byte_order
)
323 gdb_byte buf
[sizeof (LONGEST
)];
325 read_memory (memaddr
, buf
, len
);
326 return extract_signed_integer (buf
, len
, byte_order
);
330 read_memory_unsigned_integer (CORE_ADDR memaddr
, int len
,
331 enum bfd_endian byte_order
)
333 gdb_byte buf
[sizeof (ULONGEST
)];
335 read_memory (memaddr
, buf
, len
);
336 return extract_unsigned_integer (buf
, len
, byte_order
);
340 read_code_integer (CORE_ADDR memaddr
, int len
,
341 enum bfd_endian byte_order
)
343 gdb_byte buf
[sizeof (LONGEST
)];
345 read_code (memaddr
, buf
, len
);
346 return extract_signed_integer (buf
, len
, byte_order
);
350 read_code_unsigned_integer (CORE_ADDR memaddr
, int len
,
351 enum bfd_endian byte_order
)
353 gdb_byte buf
[sizeof (ULONGEST
)];
355 read_code (memaddr
, buf
, len
);
356 return extract_unsigned_integer (buf
, len
, byte_order
);
360 read_memory_string (CORE_ADDR memaddr
, char *buffer
, int max_len
)
369 if (cp
- buffer
>= max_len
)
371 buffer
[max_len
- 1] = '\0';
374 cnt
= max_len
- (cp
- buffer
);
377 read_memory (memaddr
+ (int) (cp
- buffer
), (gdb_byte
*) cp
, cnt
);
378 for (i
= 0; i
< cnt
&& *cp
; i
++, cp
++)
387 read_memory_typed_address (CORE_ADDR addr
, struct type
*type
)
389 gdb_byte
*buf
= (gdb_byte
*) alloca (TYPE_LENGTH (type
));
391 read_memory (addr
, buf
, TYPE_LENGTH (type
));
392 return extract_typed_address (buf
, type
);
398 write_memory (CORE_ADDR memaddr
,
399 const bfd_byte
*myaddr
, ssize_t len
)
403 status
= target_write_memory (memaddr
, myaddr
, len
);
405 memory_error (TARGET_XFER_E_IO
, memaddr
);
408 /* Same as write_memory, but notify 'memory_changed' observers. */
411 write_memory_with_notification (CORE_ADDR memaddr
, const bfd_byte
*myaddr
,
414 write_memory (memaddr
, myaddr
, len
);
415 observer_notify_memory_changed (current_inferior (), memaddr
, len
, myaddr
);
418 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned
421 write_memory_unsigned_integer (CORE_ADDR addr
, int len
,
422 enum bfd_endian byte_order
,
425 gdb_byte
*buf
= (gdb_byte
*) alloca (len
);
427 store_unsigned_integer (buf
, len
, byte_order
, value
);
428 write_memory (addr
, buf
, len
);
431 /* Store VALUE at ADDR in the inferior as a LEN-byte signed
434 write_memory_signed_integer (CORE_ADDR addr
, int len
,
435 enum bfd_endian byte_order
,
438 gdb_byte
*buf
= (gdb_byte
*) alloca (len
);
440 store_signed_integer (buf
, len
, byte_order
, value
);
441 write_memory (addr
, buf
, len
);
444 /* The current default bfd target. Points to storage allocated for
448 /* Same thing, except it is "auto" not NULL for the default case. */
449 static char *gnutarget_string
;
451 show_gnutarget_string (struct ui_file
*file
, int from_tty
,
452 struct cmd_list_element
*c
,
455 fprintf_filtered (file
,
456 _("The current BFD target is \"%s\".\n"), value
);
459 static void set_gnutarget_command (char *, int,
460 struct cmd_list_element
*);
463 set_gnutarget_command (char *ignore
, int from_tty
,
464 struct cmd_list_element
*c
)
466 char *gend
= gnutarget_string
+ strlen (gnutarget_string
);
468 gend
= remove_trailing_whitespace (gnutarget_string
, gend
);
471 if (strcmp (gnutarget_string
, "auto") == 0)
474 gnutarget
= gnutarget_string
;
477 /* A completion function for "set gnutarget". */
480 complete_set_gnutarget (struct cmd_list_element
*cmd
,
481 completion_tracker
&tracker
,
482 const char *text
, const char *word
)
484 static const char **bfd_targets
;
486 if (bfd_targets
== NULL
)
490 bfd_targets
= bfd_target_list ();
491 for (last
= 0; bfd_targets
[last
] != NULL
; ++last
)
494 bfd_targets
= XRESIZEVEC (const char *, bfd_targets
, last
+ 2);
495 bfd_targets
[last
] = "auto";
496 bfd_targets
[last
+ 1] = NULL
;
499 complete_on_enum (tracker
, bfd_targets
, text
, word
);
502 /* Set the gnutarget. */
504 set_gnutarget (const char *newtarget
)
506 if (gnutarget_string
!= NULL
)
507 xfree (gnutarget_string
);
508 gnutarget_string
= xstrdup (newtarget
);
509 set_gnutarget_command (NULL
, 0, NULL
);
513 _initialize_core (void)
515 struct cmd_list_element
*c
;
517 c
= add_cmd ("core-file", class_files
, core_file_command
, _("\
518 Use FILE as core dump for examining memory and registers.\n\
519 No arg means have no core file. This command has been superseded by the\n\
520 `target core' and `detach' commands."), &cmdlist
);
521 set_cmd_completer (c
, filename_completer
);
524 c
= add_setshow_string_noescape_cmd ("gnutarget", class_files
,
525 &gnutarget_string
, _("\
526 Set the current BFD target."), _("\
527 Show the current BFD target."), _("\
528 Use `set gnutarget auto' to specify automatic detection."),
529 set_gnutarget_command
,
530 show_gnutarget_string
,
531 &setlist
, &showlist
);
532 set_cmd_completer (c
, complete_set_gnutarget
);
534 add_alias_cmd ("g", "gnutarget", class_files
, 1, &setlist
);
536 if (getenv ("GNUTARGET"))
537 set_gnutarget (getenv ("GNUTARGET"));
539 set_gnutarget ("auto");