1 /* Core dump and executable file functions above target vector, for GDB.
3 Copyright (C) 1986-2018 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"
33 #include "observable.h"
34 #include "cli/cli-utils.h"
36 /* You can have any number of hooks for `exec_file_command' command to
37 call. If there's only one hook, it is set in exec_file_display
38 hook. If there are two or more hooks, they are set in
39 exec_file_extra_hooks[], and deprecated_exec_file_display_hook is
40 set to a function that calls all of them. This extra complexity is
41 needed to preserve compatibility with old code that assumed that
42 only one hook could be set, and which called
43 deprecated_exec_file_display_hook directly. */
45 typedef void (*hook_type
) (const char *);
47 hook_type deprecated_exec_file_display_hook
; /* The original hook. */
48 static hook_type
*exec_file_extra_hooks
; /* Array of additional
50 static int exec_file_hook_count
= 0; /* Size of array. */
54 /* Backward compatability with old way of specifying core files. */
57 core_file_command (const char *filename
, int from_tty
)
59 dont_repeat (); /* Either way, seems bogus. */
63 gdb_assert (the_core_target
!= NULL
);
65 the_core_target
->detach (current_inferior (), from_tty
);
68 core_target_open (filename
, from_tty
);
72 /* If there are two or more functions that wish to hook into
73 exec_file_command, this function will call all of the hook
77 call_extra_exec_file_hooks (const char *filename
)
81 for (i
= 0; i
< exec_file_hook_count
; i
++)
82 (*exec_file_extra_hooks
[i
]) (filename
);
85 /* Call this to specify the hook for exec_file_command to call back.
86 This is called from the x-window display code. */
89 specify_exec_file_hook (void (*hook
) (const char *))
93 if (deprecated_exec_file_display_hook
!= NULL
)
95 /* There's already a hook installed. Arrange to have both it
96 and the subsequent hooks called. */
97 if (exec_file_hook_count
== 0)
99 /* If this is the first extra hook, initialize the hook
101 exec_file_extra_hooks
= XNEW (hook_type
);
102 exec_file_extra_hooks
[0] = deprecated_exec_file_display_hook
;
103 deprecated_exec_file_display_hook
= call_extra_exec_file_hooks
;
104 exec_file_hook_count
= 1;
107 /* Grow the hook array by one and add the new hook to the end.
108 Yes, it's inefficient to grow it by one each time but since
109 this is hardly ever called it's not a big deal. */
110 exec_file_hook_count
++;
111 new_array
= (hook_type
*)
112 xrealloc (exec_file_extra_hooks
,
113 exec_file_hook_count
* sizeof (hook_type
));
114 exec_file_extra_hooks
= new_array
;
115 exec_file_extra_hooks
[exec_file_hook_count
- 1] = hook
;
118 deprecated_exec_file_display_hook
= hook
;
122 reopen_exec_file (void)
127 /* Don't do anything if there isn't an exec file. */
128 if (exec_bfd
== NULL
)
131 /* If the timestamp of the exec file has changed, reopen it. */
132 std::string filename
= bfd_get_filename (exec_bfd
);
133 res
= stat (filename
.c_str (), &st
);
135 if (res
== 0 && exec_bfd_mtime
&& exec_bfd_mtime
!= st
.st_mtime
)
136 exec_file_attach (filename
.c_str (), 0);
138 /* If we accessed the file since last opening it, close it now;
139 this stops GDB from holding the executable open after it
141 bfd_cache_close_all ();
144 /* If we have both a core file and an exec file,
145 print a warning if they don't go together. */
148 validate_files (void)
150 if (exec_bfd
&& core_bfd
)
152 if (!core_file_matches_executable_p (core_bfd
, exec_bfd
))
153 warning (_("core file may not match specified executable file."));
154 else if (bfd_get_mtime (exec_bfd
) > bfd_get_mtime (core_bfd
))
155 warning (_("exec file is newer than core file."));
159 /* See common/common-inferior.h. */
162 get_exec_file (int err
)
165 return exec_filename
;
169 error (_("No executable file specified.\n\
170 Use the \"file\" or \"exec-file\" command."));
176 memory_error_message (enum target_xfer_status err
,
177 struct gdbarch
*gdbarch
, CORE_ADDR memaddr
)
181 case TARGET_XFER_E_IO
:
182 /* Actually, address between memaddr and memaddr + len was out of
184 return string_printf (_("Cannot access memory at address %s"),
185 paddress (gdbarch
, memaddr
));
186 case TARGET_XFER_UNAVAILABLE
:
187 return string_printf (_("Memory at address %s unavailable."),
188 paddress (gdbarch
, memaddr
));
190 internal_error (__FILE__
, __LINE__
,
191 "unhandled target_xfer_status: %s (%s)",
192 target_xfer_status_to_string (err
),
197 /* Report a memory error by throwing a suitable exception. */
200 memory_error (enum target_xfer_status err
, CORE_ADDR memaddr
)
202 enum errors exception
= GDB_NO_ERROR
;
204 /* Build error string. */
205 std::string str
= memory_error_message (err
, target_gdbarch (), memaddr
);
207 /* Choose the right error to throw. */
210 case TARGET_XFER_E_IO
:
211 exception
= MEMORY_ERROR
;
213 case TARGET_XFER_UNAVAILABLE
:
214 exception
= NOT_AVAILABLE_ERROR
;
219 throw_error (exception
, ("%s"), str
.c_str ());
222 /* Helper function. */
225 read_memory_object (enum target_object object
, CORE_ADDR memaddr
,
226 gdb_byte
*myaddr
, ssize_t len
)
232 enum target_xfer_status status
;
235 status
= target_xfer_partial (target_stack
, object
, NULL
,
236 myaddr
+ xfered
, NULL
,
237 memaddr
+ xfered
, len
- xfered
,
240 if (status
!= TARGET_XFER_OK
)
241 memory_error (status
== TARGET_XFER_EOF
? TARGET_XFER_E_IO
: status
,
244 xfered
+= xfered_len
;
249 /* Same as target_read_memory, but report an error if can't read. */
252 read_memory (CORE_ADDR memaddr
, gdb_byte
*myaddr
, ssize_t len
)
254 read_memory_object (TARGET_OBJECT_MEMORY
, memaddr
, myaddr
, len
);
257 /* Same as target_read_stack, but report an error if can't read. */
260 read_stack (CORE_ADDR memaddr
, gdb_byte
*myaddr
, ssize_t len
)
262 read_memory_object (TARGET_OBJECT_STACK_MEMORY
, memaddr
, myaddr
, len
);
265 /* Same as target_read_code, but report an error if can't read. */
268 read_code (CORE_ADDR memaddr
, gdb_byte
*myaddr
, ssize_t len
)
270 read_memory_object (TARGET_OBJECT_CODE_MEMORY
, memaddr
, myaddr
, 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
,
279 enum bfd_endian byte_order
,
280 LONGEST
*return_value
)
282 gdb_byte buf
[sizeof (LONGEST
)];
284 if (target_read_memory (memaddr
, buf
, len
))
287 *return_value
= extract_signed_integer (buf
, len
, byte_order
);
291 /* Read memory at MEMADDR of length LEN and put the contents in
292 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
296 safe_read_memory_unsigned_integer (CORE_ADDR memaddr
, int len
,
297 enum bfd_endian byte_order
,
298 ULONGEST
*return_value
)
300 gdb_byte buf
[sizeof (ULONGEST
)];
302 if (target_read_memory (memaddr
, buf
, len
))
305 *return_value
= extract_unsigned_integer (buf
, len
, byte_order
);
310 read_memory_integer (CORE_ADDR memaddr
, int len
,
311 enum bfd_endian byte_order
)
313 gdb_byte buf
[sizeof (LONGEST
)];
315 read_memory (memaddr
, buf
, len
);
316 return extract_signed_integer (buf
, len
, byte_order
);
320 read_memory_unsigned_integer (CORE_ADDR memaddr
, int len
,
321 enum bfd_endian byte_order
)
323 gdb_byte buf
[sizeof (ULONGEST
)];
325 read_memory (memaddr
, buf
, len
);
326 return extract_unsigned_integer (buf
, len
, byte_order
);
330 read_code_integer (CORE_ADDR memaddr
, int len
,
331 enum bfd_endian byte_order
)
333 gdb_byte buf
[sizeof (LONGEST
)];
335 read_code (memaddr
, buf
, len
);
336 return extract_signed_integer (buf
, len
, byte_order
);
340 read_code_unsigned_integer (CORE_ADDR memaddr
, int len
,
341 enum bfd_endian byte_order
)
343 gdb_byte buf
[sizeof (ULONGEST
)];
345 read_code (memaddr
, buf
, len
);
346 return extract_unsigned_integer (buf
, len
, byte_order
);
350 read_memory_string (CORE_ADDR memaddr
, char *buffer
, int max_len
)
359 if (cp
- buffer
>= max_len
)
361 buffer
[max_len
- 1] = '\0';
364 cnt
= max_len
- (cp
- buffer
);
367 read_memory (memaddr
+ (int) (cp
- buffer
), (gdb_byte
*) cp
, cnt
);
368 for (i
= 0; i
< cnt
&& *cp
; i
++, cp
++)
377 read_memory_typed_address (CORE_ADDR addr
, struct type
*type
)
379 gdb_byte
*buf
= (gdb_byte
*) alloca (TYPE_LENGTH (type
));
381 read_memory (addr
, buf
, TYPE_LENGTH (type
));
382 return extract_typed_address (buf
, type
);
388 write_memory (CORE_ADDR memaddr
,
389 const bfd_byte
*myaddr
, ssize_t len
)
393 status
= target_write_memory (memaddr
, myaddr
, len
);
395 memory_error (TARGET_XFER_E_IO
, memaddr
);
398 /* Same as write_memory, but notify 'memory_changed' observers. */
401 write_memory_with_notification (CORE_ADDR memaddr
, const bfd_byte
*myaddr
,
404 write_memory (memaddr
, myaddr
, len
);
405 gdb::observers::memory_changed
.notify (current_inferior (), memaddr
, len
, myaddr
);
408 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned
411 write_memory_unsigned_integer (CORE_ADDR addr
, int len
,
412 enum bfd_endian byte_order
,
415 gdb_byte
*buf
= (gdb_byte
*) alloca (len
);
417 store_unsigned_integer (buf
, len
, byte_order
, value
);
418 write_memory (addr
, buf
, len
);
421 /* Store VALUE at ADDR in the inferior as a LEN-byte signed
424 write_memory_signed_integer (CORE_ADDR addr
, int len
,
425 enum bfd_endian byte_order
,
428 gdb_byte
*buf
= (gdb_byte
*) alloca (len
);
430 store_signed_integer (buf
, len
, byte_order
, value
);
431 write_memory (addr
, buf
, len
);
434 /* The current default bfd target. Points to storage allocated for
438 /* Same thing, except it is "auto" not NULL for the default case. */
439 static char *gnutarget_string
;
441 show_gnutarget_string (struct ui_file
*file
, int from_tty
,
442 struct cmd_list_element
*c
,
445 fprintf_filtered (file
,
446 _("The current BFD target is \"%s\".\n"), value
);
450 set_gnutarget_command (const char *ignore
, int from_tty
,
451 struct cmd_list_element
*c
)
453 char *gend
= gnutarget_string
+ strlen (gnutarget_string
);
455 gend
= remove_trailing_whitespace (gnutarget_string
, gend
);
458 if (strcmp (gnutarget_string
, "auto") == 0)
461 gnutarget
= gnutarget_string
;
464 /* A completion function for "set gnutarget". */
467 complete_set_gnutarget (struct cmd_list_element
*cmd
,
468 completion_tracker
&tracker
,
469 const char *text
, const char *word
)
471 static const char **bfd_targets
;
473 if (bfd_targets
== NULL
)
477 bfd_targets
= bfd_target_list ();
478 for (last
= 0; bfd_targets
[last
] != NULL
; ++last
)
481 bfd_targets
= XRESIZEVEC (const char *, bfd_targets
, last
+ 2);
482 bfd_targets
[last
] = "auto";
483 bfd_targets
[last
+ 1] = NULL
;
486 complete_on_enum (tracker
, bfd_targets
, text
, word
);
489 /* Set the gnutarget. */
491 set_gnutarget (const char *newtarget
)
493 if (gnutarget_string
!= NULL
)
494 xfree (gnutarget_string
);
495 gnutarget_string
= xstrdup (newtarget
);
496 set_gnutarget_command (NULL
, 0, NULL
);
500 _initialize_core (void)
502 struct cmd_list_element
*c
;
504 c
= add_cmd ("core-file", class_files
, core_file_command
, _("\
505 Use FILE as core dump for examining memory and registers.\n\
506 No arg means have no core file. This command has been superseded by the\n\
507 `target core' and `detach' commands."), &cmdlist
);
508 set_cmd_completer (c
, filename_completer
);
511 c
= add_setshow_string_noescape_cmd ("gnutarget", class_files
,
512 &gnutarget_string
, _("\
513 Set the current BFD target."), _("\
514 Show the current BFD target."), _("\
515 Use `set gnutarget auto' to specify automatic detection."),
516 set_gnutarget_command
,
517 show_gnutarget_string
,
518 &setlist
, &showlist
);
519 set_cmd_completer (c
, complete_set_gnutarget
);
521 add_alias_cmd ("g", "gnutarget", class_files
, 1, &setlist
);
523 if (getenv ("GNUTARGET"))
524 set_gnutarget (getenv ("GNUTARGET"));
526 set_gnutarget ("auto");