blob: ac8eff55a6e2559878c001601ed29ca5a41f883f [file] [log] [blame]
/* Core dump and executable file functions above target vector, for GDB.
Copyright (C) 1986-1987, 1989, 1991-1994, 1996-2001, 2003, 2006-2012
Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <>. */
#include "defs.h"
#include "gdb_string.h"
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include "inferior.h"
#include "symtab.h"
#include "command.h"
#include "gdbcmd.h"
#include "bfd.h"
#include "target.h"
#include "gdbcore.h"
#include "dis-asm.h"
#include "gdb_stat.h"
#include "completer.h"
#include "exceptions.h"
#include "observer.h"
/* Local function declarations. */
extern void _initialize_core (void);
static void call_extra_exec_file_hooks (char *filename);
/* You can have any number of hooks for `exec_file_command' command to
call. If there's only one hook, it is set in exec_file_display
hook. If there are two or more hooks, they are set in
exec_file_extra_hooks[], and deprecated_exec_file_display_hook is
set to a function that calls all of them. This extra complexity is
needed to preserve compatibility with old code that assumed that
only one hook could be set, and which called
deprecated_exec_file_display_hook directly. */
typedef void (*hook_type) (char *);
hook_type deprecated_exec_file_display_hook; /* The original hook. */
static hook_type *exec_file_extra_hooks; /* Array of additional
hooks. */
static int exec_file_hook_count = 0; /* Size of array. */
/* Binary file diddling handle for the core file. */
bfd *core_bfd = NULL;
/* corelow.c target. It is never NULL after GDB initialization. */
struct target_ops *core_target;
/* Backward compatability with old way of specifying core files. */
core_file_command (char *filename, int from_tty)
dont_repeat (); /* Either way, seems bogus. */
gdb_assert (core_target != NULL);
if (!filename)
(core_target->to_detach) (core_target, filename, from_tty);
(core_target->to_open) (filename, from_tty);
/* If there are two or more functions that wish to hook into
exec_file_command, this function will call all of the hook
functions. */
static void
call_extra_exec_file_hooks (char *filename)
int i;
for (i = 0; i < exec_file_hook_count; i++)
(*exec_file_extra_hooks[i]) (filename);
/* Call this to specify the hook for exec_file_command to call back.
This is called from the x-window display code. */
specify_exec_file_hook (void (*hook) (char *))
hook_type *new_array;
if (deprecated_exec_file_display_hook != NULL)
/* There's already a hook installed. Arrange to have both it
and the subsequent hooks called. */
if (exec_file_hook_count == 0)
/* If this is the first extra hook, initialize the hook
array. */
exec_file_extra_hooks = (hook_type *)
xmalloc (sizeof (hook_type));
exec_file_extra_hooks[0] = deprecated_exec_file_display_hook;
deprecated_exec_file_display_hook = call_extra_exec_file_hooks;
exec_file_hook_count = 1;
/* Grow the hook array by one and add the new hook to the end.
Yes, it's inefficient to grow it by one each time but since
this is hardly ever called it's not a big deal. */
new_array = (hook_type *)
xrealloc (exec_file_extra_hooks,
exec_file_hook_count * sizeof (hook_type));
exec_file_extra_hooks = new_array;
exec_file_extra_hooks[exec_file_hook_count - 1] = hook;
deprecated_exec_file_display_hook = hook;
reopen_exec_file (void)
char *filename;
int res;
struct stat st;
struct cleanup *cleanups;
/* Don't do anything if there isn't an exec file. */
if (exec_bfd == NULL)
/* If the timestamp of the exec file has changed, reopen it. */
filename = xstrdup (bfd_get_filename (exec_bfd));
cleanups = make_cleanup (xfree, filename);
res = stat (filename, &st);
if (exec_bfd_mtime && exec_bfd_mtime != st.st_mtime)
exec_file_attach (filename, 0);
/* If we accessed the file since last opening it, close it now;
this stops GDB from holding the executable open after it
exits. */
bfd_cache_close_all ();
do_cleanups (cleanups);
/* If we have both a core file and an exec file,
print a warning if they don't go together. */
validate_files (void)
if (exec_bfd && core_bfd)
if (!core_file_matches_executable_p (core_bfd, exec_bfd))
warning (_("core file may not match specified executable file."));
else if (bfd_get_mtime (exec_bfd) > bfd_get_mtime (core_bfd))
warning (_("exec file is newer than core file."));
/* Return the name of the executable file as a string.
ERR nonzero means get error if there is none specified;
otherwise return 0 in that case. */
char *
get_exec_file (int err)
if (exec_bfd)
return bfd_get_filename (exec_bfd);
if (!err)
return NULL;
error (_("No executable file specified.\n\
Use the \"file\" or \"exec-file\" command."));
return NULL;
/* Report a memory error by throwing a MEMORY_ERROR error. */
memory_error (int status, CORE_ADDR memaddr)
if (status == EIO)
/* Actually, address between memaddr and memaddr + len was out of
bounds. */
throw_error (MEMORY_ERROR,
_("Cannot access memory at address %s"),
paddress (target_gdbarch, memaddr));
throw_error (MEMORY_ERROR,
_("Error accessing memory address %s: %s."),
paddress (target_gdbarch, memaddr),
safe_strerror (status));
/* Same as target_read_memory, but report an error if can't read. */
read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
int status;
status = target_read_memory (memaddr, myaddr, len);
if (status != 0)
memory_error (status, memaddr);
/* Same as target_read_stack, but report an error if can't read. */
read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
int status;
status = target_read_stack (memaddr, myaddr, len);
if (status != 0)
memory_error (status, memaddr);
/* Argument / return result struct for use with
do_captured_read_memory_integer(). MEMADDR and LEN are filled in
by gdb_read_memory_integer(). RESULT is the contents that were
successfully read from MEMADDR of length LEN. */
struct captured_read_memory_integer_arguments
CORE_ADDR memaddr;
int len;
enum bfd_endian byte_order;
LONGEST result;
/* Helper function for gdb_read_memory_integer(). DATA must be a
pointer to a captured_read_memory_integer_arguments struct.
Return 1 if successful. Note that the catch_errors() interface
will return 0 if an error occurred while reading memory. This
choice of return code is so that we can distinguish between
success and failure. */
static int
do_captured_read_memory_integer (void *data)
struct captured_read_memory_integer_arguments *args
= (struct captured_read_memory_integer_arguments*) data;
CORE_ADDR memaddr = args->memaddr;
int len = args->len;
enum bfd_endian byte_order = args->byte_order;
args->result = read_memory_integer (memaddr, len, byte_order);
return 1;
/* Read memory at MEMADDR of length LEN and put the contents in
RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
if successful. */
safe_read_memory_integer (CORE_ADDR memaddr, int len,
enum bfd_endian byte_order,
LONGEST *return_value)
int status;
struct captured_read_memory_integer_arguments args;
args.memaddr = memaddr;
args.len = len;
args.byte_order = byte_order;
status = catch_errors (do_captured_read_memory_integer, &args,
if (status)
*return_value = args.result;
return status;
read_memory_integer (CORE_ADDR memaddr, int len,
enum bfd_endian byte_order)
gdb_byte buf[sizeof (LONGEST)];
read_memory (memaddr, buf, len);
return extract_signed_integer (buf, len, byte_order);
read_memory_unsigned_integer (CORE_ADDR memaddr, int len,
enum bfd_endian byte_order)
gdb_byte buf[sizeof (ULONGEST)];
read_memory (memaddr, buf, len);
return extract_unsigned_integer (buf, len, byte_order);
read_memory_string (CORE_ADDR memaddr, char *buffer, int max_len)
char *cp;
int i;
int cnt;
cp = buffer;
while (1)
if (cp - buffer >= max_len)
buffer[max_len - 1] = '\0';
cnt = max_len - (cp - buffer);
if (cnt > 8)
cnt = 8;
read_memory (memaddr + (int) (cp - buffer), cp, cnt);
for (i = 0; i < cnt && *cp; i++, cp++)
; /* null body */
if (i < cnt && !*cp)
read_memory_typed_address (CORE_ADDR addr, struct type *type)
gdb_byte *buf = alloca (TYPE_LENGTH (type));
read_memory (addr, buf, TYPE_LENGTH (type));
return extract_typed_address (buf, type);
/* Same as target_write_memory, but report an error if can't
write. */
write_memory (CORE_ADDR memaddr,
const bfd_byte *myaddr, ssize_t len)
int status;
status = target_write_memory (memaddr, myaddr, len);
if (status != 0)
memory_error (status, memaddr);
/* Same as write_memory, but notify 'memory_changed' observers. */
write_memory_with_notification (CORE_ADDR memaddr, const bfd_byte *myaddr,
ssize_t len)
write_memory (memaddr, myaddr, len);
observer_notify_memory_changed (memaddr, len, myaddr);
/* Store VALUE at ADDR in the inferior as a LEN-byte unsigned
integer. */
write_memory_unsigned_integer (CORE_ADDR addr, int len,
enum bfd_endian byte_order,
gdb_byte *buf = alloca (len);
store_unsigned_integer (buf, len, byte_order, value);
write_memory (addr, buf, len);
/* Store VALUE at ADDR in the inferior as a LEN-byte signed
integer. */
write_memory_signed_integer (CORE_ADDR addr, int len,
enum bfd_endian byte_order,
LONGEST value)
gdb_byte *buf = alloca (len);
store_signed_integer (buf, len, byte_order, value);
write_memory (addr, buf, len);
/* The current default bfd target. Points to storage allocated for
gnutarget_string. */
char *gnutarget;
/* Same thing, except it is "auto" not NULL for the default case. */
static char *gnutarget_string;
static void
show_gnutarget_string (struct ui_file *file, int from_tty,
struct cmd_list_element *c,
const char *value)
fprintf_filtered (file,
_("The current BFD target is \"%s\".\n"), value);
static void set_gnutarget_command (char *, int,
struct cmd_list_element *);
static void
set_gnutarget_command (char *ignore, int from_tty,
struct cmd_list_element *c)
if (strcmp (gnutarget_string, "auto") == 0)
gnutarget = NULL;
gnutarget = gnutarget_string;
/* Set the gnutarget. */
set_gnutarget (char *newtarget)
if (gnutarget_string != NULL)
xfree (gnutarget_string);
gnutarget_string = xstrdup (newtarget);
set_gnutarget_command (NULL, 0, NULL);
_initialize_core (void)
struct cmd_list_element *c;
c = add_cmd ("core-file", class_files, core_file_command, _("\
Use FILE as core dump for examining memory and registers.\n\
No arg means have no core file. This command has been superseded by the\n\
`target core' and `detach' commands."), &cmdlist);
set_cmd_completer (c, filename_completer);
add_setshow_string_noescape_cmd ("gnutarget", class_files,
&gnutarget_string, _("\
Set the current BFD target."), _("\
Show the current BFD target."), _("\
Use `set gnutarget auto' to specify automatic detection."),
&setlist, &showlist);
if (getenv ("GNUTARGET"))
set_gnutarget (getenv ("GNUTARGET"));
set_gnutarget ("auto");