431 lines
12 KiB
C
431 lines
12 KiB
C
/* Core dump and executable file functions above target vector, for GDB.
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Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1996, 1997, 1998,
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1999, 2000, 2001, 2003, 2006, 2007, 2008, 2009
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdb_string.h"
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#include <errno.h>
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#include <signal.h>
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#include <fcntl.h>
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#include "inferior.h"
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#include "symtab.h"
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#include "command.h"
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#include "gdbcmd.h"
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#include "bfd.h"
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#include "target.h"
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#include "gdbcore.h"
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#include "dis-asm.h"
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#include "gdb_stat.h"
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#include "completer.h"
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#include "exceptions.h"
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/* Local function declarations. */
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extern void _initialize_core (void);
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static void call_extra_exec_file_hooks (char *filename);
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/* You can have any number of hooks for `exec_file_command' command to
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call. If there's only one hook, it is set in exec_file_display
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hook. If there are two or more hooks, they are set in
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exec_file_extra_hooks[], and deprecated_exec_file_display_hook is
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set to a function that calls all of them. This extra complexity is
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needed to preserve compatibility with old code that assumed that
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only one hook could be set, and which called
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deprecated_exec_file_display_hook directly. */
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typedef void (*hook_type) (char *);
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hook_type deprecated_exec_file_display_hook; /* the original hook */
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static hook_type *exec_file_extra_hooks; /* array of additional hooks */
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static int exec_file_hook_count = 0; /* size of array */
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/* Binary file diddling handle for the core file. */
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bfd *core_bfd = NULL;
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/* Backward compatability with old way of specifying core files. */
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void
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core_file_command (char *filename, int from_tty)
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{
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struct target_ops *t;
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dont_repeat (); /* Either way, seems bogus. */
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t = find_core_target ();
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if (t == NULL)
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error (_("GDB can't read core files on this machine."));
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if (!filename)
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(t->to_detach) (t, filename, from_tty);
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else
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(t->to_open) (filename, from_tty);
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}
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/* If there are two or more functions that wish to hook into
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exec_file_command, this function will call all of the hook
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functions. */
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static void
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call_extra_exec_file_hooks (char *filename)
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{
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int i;
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for (i = 0; i < exec_file_hook_count; i++)
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(*exec_file_extra_hooks[i]) (filename);
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}
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/* Call this to specify the hook for exec_file_command to call back.
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This is called from the x-window display code. */
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void
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specify_exec_file_hook (void (*hook) (char *))
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{
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hook_type *new_array;
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if (deprecated_exec_file_display_hook != NULL)
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{
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/* There's already a hook installed. Arrange to have both it
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* and the subsequent hooks called. */
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if (exec_file_hook_count == 0)
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{
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/* If this is the first extra hook, initialize the hook array. */
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exec_file_extra_hooks = (hook_type *) xmalloc (sizeof (hook_type));
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exec_file_extra_hooks[0] = deprecated_exec_file_display_hook;
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deprecated_exec_file_display_hook = call_extra_exec_file_hooks;
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exec_file_hook_count = 1;
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}
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/* Grow the hook array by one and add the new hook to the end.
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Yes, it's inefficient to grow it by one each time but since
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this is hardly ever called it's not a big deal. */
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exec_file_hook_count++;
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new_array =
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(hook_type *) xrealloc (exec_file_extra_hooks,
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exec_file_hook_count * sizeof (hook_type));
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exec_file_extra_hooks = new_array;
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exec_file_extra_hooks[exec_file_hook_count - 1] = hook;
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}
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else
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deprecated_exec_file_display_hook = hook;
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}
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/* The exec file must be closed before running an inferior.
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If it is needed again after the inferior dies, it must
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be reopened. */
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void
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close_exec_file (void)
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{
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#if 0 /* FIXME */
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if (exec_bfd)
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bfd_tempclose (exec_bfd);
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#endif
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}
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void
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reopen_exec_file (void)
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{
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#if 0 /* FIXME */
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if (exec_bfd)
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bfd_reopen (exec_bfd);
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#else
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char *filename;
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int res;
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struct stat st;
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long mtime;
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struct cleanup *cleanups;
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/* Don't do anything if there isn't an exec file. */
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if (exec_bfd == NULL)
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return;
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/* If the timestamp of the exec file has changed, reopen it. */
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filename = xstrdup (bfd_get_filename (exec_bfd));
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cleanups = make_cleanup (xfree, filename);
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res = stat (filename, &st);
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if (exec_bfd_mtime && exec_bfd_mtime != st.st_mtime)
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exec_file_attach (filename, 0);
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else
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/* If we accessed the file since last opening it, close it now;
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this stops GDB from holding the executable open after it
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exits. */
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bfd_cache_close_all ();
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do_cleanups (cleanups);
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#endif
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}
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/* If we have both a core file and an exec file,
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print a warning if they don't go together. */
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void
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validate_files (void)
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{
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if (exec_bfd && core_bfd)
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{
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if (!core_file_matches_executable_p (core_bfd, exec_bfd))
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warning (_("core file may not match specified executable file."));
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else if (bfd_get_mtime (exec_bfd) > bfd_get_mtime (core_bfd))
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warning (_("exec file is newer than core file."));
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}
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}
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/* Return the name of the executable file as a string.
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ERR nonzero means get error if there is none specified;
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otherwise return 0 in that case. */
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char *
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get_exec_file (int err)
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{
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if (exec_bfd)
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return bfd_get_filename (exec_bfd);
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if (!err)
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return NULL;
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error (_("No executable file specified.\n\
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Use the \"file\" or \"exec-file\" command."));
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return NULL;
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}
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/* Report a memory error by throwing a MEMORY_ERROR error. */
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void
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memory_error (int status, CORE_ADDR memaddr)
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{
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if (status == EIO)
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/* Actually, address between memaddr and memaddr + len was out of
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bounds. */
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throw_error (MEMORY_ERROR,
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_("Cannot access memory at address %s"),
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paddress (memaddr));
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else
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throw_error (MEMORY_ERROR,
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_("Error accessing memory address %s: %s."),
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paddress (memaddr),
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safe_strerror (status));
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}
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/* Same as target_read_memory, but report an error if can't read. */
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void
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read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
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{
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int status;
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status = target_read_memory (memaddr, myaddr, len);
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if (status != 0)
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memory_error (status, memaddr);
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}
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/* Argument / return result struct for use with
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do_captured_read_memory_integer(). MEMADDR and LEN are filled in
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by gdb_read_memory_integer(). RESULT is the contents that were
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successfully read from MEMADDR of length LEN. */
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struct captured_read_memory_integer_arguments
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{
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CORE_ADDR memaddr;
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int len;
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LONGEST result;
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};
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/* Helper function for gdb_read_memory_integer(). DATA must be a
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pointer to a captured_read_memory_integer_arguments struct.
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Return 1 if successful. Note that the catch_errors() interface
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will return 0 if an error occurred while reading memory. This
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choice of return code is so that we can distinguish between
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success and failure. */
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static int
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do_captured_read_memory_integer (void *data)
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{
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struct captured_read_memory_integer_arguments *args = (struct captured_read_memory_integer_arguments*) data;
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CORE_ADDR memaddr = args->memaddr;
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int len = args->len;
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args->result = read_memory_integer (memaddr, len);
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return 1;
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}
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/* Read memory at MEMADDR of length LEN and put the contents in
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RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero
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if successful. */
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int
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safe_read_memory_integer (CORE_ADDR memaddr, int len, LONGEST *return_value)
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{
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int status;
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struct captured_read_memory_integer_arguments args;
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args.memaddr = memaddr;
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args.len = len;
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status = catch_errors (do_captured_read_memory_integer, &args,
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"", RETURN_MASK_ALL);
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if (status)
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*return_value = args.result;
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return status;
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}
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LONGEST
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read_memory_integer (CORE_ADDR memaddr, int len)
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{
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gdb_byte buf[sizeof (LONGEST)];
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read_memory (memaddr, buf, len);
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return extract_signed_integer (buf, len);
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}
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ULONGEST
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read_memory_unsigned_integer (CORE_ADDR memaddr, int len)
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{
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gdb_byte buf[sizeof (ULONGEST)];
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read_memory (memaddr, buf, len);
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return extract_unsigned_integer (buf, len);
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}
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void
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read_memory_string (CORE_ADDR memaddr, char *buffer, int max_len)
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{
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char *cp;
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int i;
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int cnt;
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cp = buffer;
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while (1)
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{
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if (cp - buffer >= max_len)
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{
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buffer[max_len - 1] = '\0';
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break;
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}
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cnt = max_len - (cp - buffer);
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if (cnt > 8)
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cnt = 8;
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read_memory (memaddr + (int) (cp - buffer), cp, cnt);
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for (i = 0; i < cnt && *cp; i++, cp++)
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; /* null body */
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if (i < cnt && !*cp)
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break;
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}
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}
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CORE_ADDR
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read_memory_typed_address (CORE_ADDR addr, struct type *type)
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{
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gdb_byte *buf = alloca (TYPE_LENGTH (type));
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read_memory (addr, buf, TYPE_LENGTH (type));
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return extract_typed_address (buf, type);
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}
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/* Same as target_write_memory, but report an error if can't write. */
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void
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write_memory (CORE_ADDR memaddr, const bfd_byte *myaddr, int len)
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{
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int status;
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status = target_write_memory (memaddr, myaddr, len);
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if (status != 0)
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memory_error (status, memaddr);
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}
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/* Store VALUE at ADDR in the inferior as a LEN-byte unsigned integer. */
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void
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write_memory_unsigned_integer (CORE_ADDR addr, int len, ULONGEST value)
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{
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gdb_byte *buf = alloca (len);
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store_unsigned_integer (buf, len, value);
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write_memory (addr, buf, len);
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}
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/* Store VALUE at ADDR in the inferior as a LEN-byte signed integer. */
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void
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write_memory_signed_integer (CORE_ADDR addr, int len, LONGEST value)
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{
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gdb_byte *buf = alloca (len);
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store_signed_integer (buf, len, value);
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write_memory (addr, buf, len);
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}
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/* The current default bfd target. Points to storage allocated for
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gnutarget_string. */
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char *gnutarget;
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/* Same thing, except it is "auto" not NULL for the default case. */
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static char *gnutarget_string;
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static void
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show_gnutarget_string (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, _("The current BFD target is \"%s\".\n"), value);
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}
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static void set_gnutarget_command (char *, int, struct cmd_list_element *);
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static void
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set_gnutarget_command (char *ignore, int from_tty, struct cmd_list_element *c)
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{
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if (strcmp (gnutarget_string, "auto") == 0)
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gnutarget = NULL;
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else
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gnutarget = gnutarget_string;
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}
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/* Set the gnutarget. */
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void
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set_gnutarget (char *newtarget)
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{
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if (gnutarget_string != NULL)
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xfree (gnutarget_string);
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gnutarget_string = savestring (newtarget, strlen (newtarget));
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set_gnutarget_command (NULL, 0, NULL);
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}
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void
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_initialize_core (void)
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{
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struct cmd_list_element *c;
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c = add_cmd ("core-file", class_files, core_file_command, _("\
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Use FILE as core dump for examining memory and registers.\n\
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No arg means have no core file. This command has been superseded by the\n\
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`target core' and `detach' commands."), &cmdlist);
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set_cmd_completer (c, filename_completer);
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add_setshow_string_noescape_cmd ("gnutarget", class_files,
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&gnutarget_string, _("\
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Set the current BFD target."), _("\
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Show the current BFD target."), _("\
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Use `set gnutarget auto' to specify automatic detection."),
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set_gnutarget_command,
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show_gnutarget_string,
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&setlist, &showlist);
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if (getenv ("GNUTARGET"))
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set_gnutarget (getenv ("GNUTARGET"));
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else
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set_gnutarget ("auto");
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}
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