404 lines
10 KiB
C
404 lines
10 KiB
C
/* Core dump and executable file functions above target vector, for GDB.
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Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1996, 1997, 1998,
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1999, 2000, 2001
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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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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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/* 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 call.
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If there's only one hook, it is set in exec_file_display hook.
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If there are two or more hooks, they are set in exec_file_extra_hooks[],
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and exec_file_display_hook is set to a function that calls all of them.
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This extra complexity is needed to preserve compatibility with
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old code that assumed that only one hook could be set, and which called
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exec_file_display_hook directly. */
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typedef void (*hook_type) (char *);
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hook_type 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) (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 exec_file_command,
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* this function will call all of the hook 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 (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] = exec_file_display_hook;
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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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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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/* Don't do anything if the current target isn't exec. */
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if (exec_bfd == NULL || strcmp (target_shortname, "exec") != 0)
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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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make_cleanup (xfree, filename);
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mtime = bfd_get_mtime (exec_bfd);
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res = stat (filename, &st);
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if (mtime && mtime != st.st_mtime)
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{
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exec_open (filename, 0);
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}
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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 with 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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struct ui_file *tmp_stream = mem_fileopen ();
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make_cleanup_ui_file_delete (tmp_stream);
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if (status == EIO)
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{
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/* Actually, address between memaddr and memaddr + len
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was out of bounds. */
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fprintf_unfiltered (tmp_stream, "Cannot access memory at address ");
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print_address_numeric (memaddr, 1, tmp_stream);
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}
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else
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{
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fprintf_filtered (tmp_stream, "Error accessing memory address ");
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print_address_numeric (memaddr, 1, tmp_stream);
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fprintf_filtered (tmp_stream, ": %s.",
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safe_strerror (status));
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}
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error_stream (tmp_stream);
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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, char *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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/* Like target_read_memory, but slightly different parameters. */
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int
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dis_asm_read_memory (bfd_vma memaddr, bfd_byte *myaddr, unsigned int len,
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disassemble_info *info)
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{
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return target_read_memory (memaddr, (char *) myaddr, len);
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}
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/* Like memory_error with slightly different parameters. */
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void
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dis_asm_memory_error (int status, bfd_vma memaddr, disassemble_info *info)
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{
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memory_error (status, memaddr);
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}
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/* Like print_address with slightly different parameters. */
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void
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dis_asm_print_address (bfd_vma addr, struct disassemble_info *info)
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{
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print_address (addr, info->stream);
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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, char *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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/* Read an integer from debugged memory, given address and number of bytes. */
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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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char 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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char 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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register char *cp;
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register 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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#if 0
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/* Enable after 4.12. It is not tested. */
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/* Search code. Targets can just make this their search function, or
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if the protocol has a less general search function, they can call this
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in the cases it can't handle. */
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void
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generic_search (int len, char *data, char *mask, CORE_ADDR startaddr,
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int increment, CORE_ADDR lorange, CORE_ADDR hirange,
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CORE_ADDR *addr_found, char *data_found)
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{
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int i;
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CORE_ADDR curaddr = startaddr;
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while (curaddr >= lorange && curaddr < hirange)
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{
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read_memory (curaddr, data_found, len);
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for (i = 0; i < len; ++i)
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if ((data_found[i] & mask[i]) != data[i])
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goto try_again;
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/* It matches. */
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*addr_found = curaddr;
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return;
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try_again:
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curaddr += increment;
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}
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*addr_found = (CORE_ADDR) 0;
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return;
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}
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#endif /* 0 */
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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 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 (STREQ (gnutarget_string, "auto"))
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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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c->completer = filename_completer;
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c = add_set_cmd ("gnutarget", class_files, var_string_noescape,
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(char *) &gnutarget_string,
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"Set the current BFD target.\n\
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Use `set gnutarget auto' to specify automatic detection.",
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&setlist);
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c->function.sfunc = set_gnutarget_command;
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add_show_from_set (c, &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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