1 /* Core dump and executable file functions above target vector, for GDB.
3 Copyright (C) 1986-2016 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 struct cleanup *cleanups;
138 /* Don't do anything if there isn't an exec file. */
139 if (exec_bfd == NULL)
142 /* If the timestamp of the exec file has changed, reopen it. */
143 filename = xstrdup (bfd_get_filename (exec_bfd));
144 cleanups = make_cleanup (xfree, filename);
145 res = stat (filename, &st);
147 if (exec_bfd_mtime && exec_bfd_mtime != st.st_mtime)
148 exec_file_attach (filename, 0);
150 /* If we accessed the file since last opening it, close it now;
151 this stops GDB from holding the executable open after it
153 bfd_cache_close_all ();
155 do_cleanups (cleanups);
158 /* If we have both a core file and an exec file,
159 print a warning if they don't go together. */
162 validate_files (void)
164 if (exec_bfd && core_bfd)
166 if (!core_file_matches_executable_p (core_bfd, exec_bfd))
167 warning (_("core file may not match specified executable file."));
168 else if (bfd_get_mtime (exec_bfd) > bfd_get_mtime (core_bfd))
169 warning (_("exec file is newer than core file."));
173 /* Return the name of the executable file as a string.
174 ERR nonzero means get error if there is none specified;
175 otherwise return 0 in that case. */
178 get_exec_file (int err)
181 return exec_filename;
185 error (_("No executable file specified.\n\
186 Use the \"file\" or \"exec-file\" command."));
192 memory_error_message (enum target_xfer_status err,
193 struct gdbarch *gdbarch, CORE_ADDR memaddr)
197 case TARGET_XFER_E_IO:
198 /* Actually, address between memaddr and memaddr + len was out of
200 return xstrprintf (_("Cannot access memory at address %s"),
201 paddress (gdbarch, memaddr));
202 case TARGET_XFER_UNAVAILABLE:
203 return xstrprintf (_("Memory at address %s unavailable."),
204 paddress (gdbarch, memaddr));
206 internal_error (__FILE__, __LINE__,
207 "unhandled target_xfer_status: %s (%s)",
208 target_xfer_status_to_string (err),
213 /* Report a memory error by throwing a suitable exception. */
216 memory_error (enum target_xfer_status err, CORE_ADDR memaddr)
219 enum errors exception = GDB_NO_ERROR;
221 /* Build error string. */
222 str = memory_error_message (err, target_gdbarch (), memaddr);
223 make_cleanup (xfree, str);
225 /* Choose the right error to throw. */
228 case TARGET_XFER_E_IO:
229 exception = MEMORY_ERROR;
231 case TARGET_XFER_UNAVAILABLE:
232 exception = NOT_AVAILABLE_ERROR;
237 throw_error (exception, ("%s"), str);
240 /* Same as target_read_memory, but report an error if can't read. */
243 read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
249 enum target_xfer_status status;
252 status = target_xfer_partial (current_target.beneath,
253 TARGET_OBJECT_MEMORY, NULL,
254 myaddr + xfered, NULL,
255 memaddr + xfered, len - xfered,
258 if (status != TARGET_XFER_OK)
259 memory_error (status == TARGET_XFER_EOF ? TARGET_XFER_E_IO : status,
262 xfered += xfered_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)
274 status = target_read_stack (memaddr, myaddr, len);
276 memory_error (TARGET_XFER_E_IO, 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 (TARGET_XFER_E_IO, memaddr);
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_integer (CORE_ADDR memaddr, int len,
297 enum bfd_endian byte_order,
298 LONGEST *return_value)
300 gdb_byte buf[sizeof (LONGEST)];
302 if (target_read_memory (memaddr, buf, len))
305 *return_value = extract_signed_integer (buf, len, byte_order);
309 /* Read memory at MEMADDR of length LEN and put the contents in
310 RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
314 safe_read_memory_unsigned_integer (CORE_ADDR memaddr, int len,
315 enum bfd_endian byte_order,
316 ULONGEST *return_value)
318 gdb_byte buf[sizeof (ULONGEST)];
320 if (target_read_memory (memaddr, buf, len))
323 *return_value = extract_unsigned_integer (buf, len, byte_order);
328 read_memory_integer (CORE_ADDR memaddr, int len,
329 enum bfd_endian byte_order)
331 gdb_byte buf[sizeof (LONGEST)];
333 read_memory (memaddr, buf, len);
334 return extract_signed_integer (buf, len, byte_order);
338 read_memory_unsigned_integer (CORE_ADDR memaddr, int len,
339 enum bfd_endian byte_order)
341 gdb_byte buf[sizeof (ULONGEST)];
343 read_memory (memaddr, buf, len);
344 return extract_unsigned_integer (buf, len, byte_order);
348 read_code_integer (CORE_ADDR memaddr, int len,
349 enum bfd_endian byte_order)
351 gdb_byte buf[sizeof (LONGEST)];
353 read_code (memaddr, buf, len);
354 return extract_signed_integer (buf, len, byte_order);
358 read_code_unsigned_integer (CORE_ADDR memaddr, int len,
359 enum bfd_endian byte_order)
361 gdb_byte buf[sizeof (ULONGEST)];
363 read_code (memaddr, buf, len);
364 return extract_unsigned_integer (buf, len, byte_order);
368 read_memory_string (CORE_ADDR memaddr, char *buffer, int max_len)
377 if (cp - buffer >= max_len)
379 buffer[max_len - 1] = '\0';
382 cnt = max_len - (cp - buffer);
385 read_memory (memaddr + (int) (cp - buffer), (gdb_byte *) cp, cnt);
386 for (i = 0; i < cnt && *cp; i++, cp++)
395 read_memory_typed_address (CORE_ADDR addr, struct type *type)
397 gdb_byte *buf = (gdb_byte *) alloca (TYPE_LENGTH (type));
399 read_memory (addr, buf, TYPE_LENGTH (type));
400 return extract_typed_address (buf, type);
406 write_memory (CORE_ADDR memaddr,
407 const bfd_byte *myaddr, ssize_t len)
411 status = target_write_memory (memaddr, myaddr, len);
413 memory_error (TARGET_XFER_E_IO, memaddr);
416 /* Same as write_memory, but notify 'memory_changed' observers. */
419 write_memory_with_notification (CORE_ADDR memaddr, const bfd_byte *myaddr,
422 write_memory (memaddr, myaddr, len);
423 observer_notify_memory_changed (current_inferior (), memaddr, len, myaddr);
426 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned
429 write_memory_unsigned_integer (CORE_ADDR addr, int len,
430 enum bfd_endian byte_order,
433 gdb_byte *buf = (gdb_byte *) alloca (len);
435 store_unsigned_integer (buf, len, byte_order, value);
436 write_memory (addr, buf, len);
439 /* Store VALUE at ADDR in the inferior as a LEN-byte signed
442 write_memory_signed_integer (CORE_ADDR addr, int len,
443 enum bfd_endian byte_order,
446 gdb_byte *buf = (gdb_byte *) alloca (len);
448 store_signed_integer (buf, len, byte_order, value);
449 write_memory (addr, buf, len);
452 /* The current default bfd target. Points to storage allocated for
456 /* Same thing, except it is "auto" not NULL for the default case. */
457 static char *gnutarget_string;
459 show_gnutarget_string (struct ui_file *file, int from_tty,
460 struct cmd_list_element *c,
463 fprintf_filtered (file,
464 _("The current BFD target is \"%s\".\n"), value);
467 static void set_gnutarget_command (char *, int,
468 struct cmd_list_element *);
471 set_gnutarget_command (char *ignore, int from_tty,
472 struct cmd_list_element *c)
474 char *gend = gnutarget_string + strlen (gnutarget_string);
476 gend = remove_trailing_whitespace (gnutarget_string, gend);
479 if (strcmp (gnutarget_string, "auto") == 0)
482 gnutarget = gnutarget_string;
485 /* A completion function for "set gnutarget". */
487 static VEC (char_ptr) *
488 complete_set_gnutarget (struct cmd_list_element *cmd,
489 const char *text, const char *word)
491 static const char **bfd_targets;
493 if (bfd_targets == NULL)
497 bfd_targets = bfd_target_list ();
498 for (last = 0; bfd_targets[last] != NULL; ++last)
501 bfd_targets = XRESIZEVEC (const char *, bfd_targets, last + 2);
502 bfd_targets[last] = "auto";
503 bfd_targets[last + 1] = NULL;
506 return complete_on_enum (bfd_targets, text, word);
509 /* Set the gnutarget. */
511 set_gnutarget (char *newtarget)
513 if (gnutarget_string != NULL)
514 xfree (gnutarget_string);
515 gnutarget_string = xstrdup (newtarget);
516 set_gnutarget_command (NULL, 0, NULL);
520 _initialize_core (void)
522 struct cmd_list_element *c;
524 c = add_cmd ("core-file", class_files, core_file_command, _("\
525 Use FILE as core dump for examining memory and registers.\n\
526 No arg means have no core file. This command has been superseded by the\n\
527 `target core' and `detach' commands."), &cmdlist);
528 set_cmd_completer (c, filename_completer);
531 c = add_setshow_string_noescape_cmd ("gnutarget", class_files,
532 &gnutarget_string, _("\
533 Set the current BFD target."), _("\
534 Show the current BFD target."), _("\
535 Use `set gnutarget auto' to specify automatic detection."),
536 set_gnutarget_command,
537 show_gnutarget_string,
538 &setlist, &showlist);
539 set_cmd_completer (c, complete_set_gnutarget);
541 add_alias_cmd ("g", "gnutarget", class_files, 1, &setlist);
543 if (getenv ("GNUTARGET"))
544 set_gnutarget (getenv ("GNUTARGET"));
546 set_gnutarget ("auto");