1991-03-28 17:28:29 +01:00
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/* Work with core dump and executable files, for GDB.
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Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
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This file is part of GDB.
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1991-06-04 09:31:55 +02:00
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This program is free software; you can redistribute it and/or modify
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1991-03-28 17:28:29 +01:00
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it under the terms of the GNU General Public License as published by
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1991-06-04 09:31:55 +02:00
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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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1991-03-28 17:28:29 +01:00
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1991-06-04 09:31:55 +02:00
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This program is distributed in the hope that it will be useful,
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1991-03-28 17:28:29 +01:00
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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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1991-06-04 09:31:55 +02:00
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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1991-03-28 17:28:29 +01:00
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#include <stdio.h>
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#include <errno.h>
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#include <signal.h>
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#include "defs.h"
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#include "param.h"
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#include "frame.h" /* required by inferior.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 "bfd.h"
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#include "target.h"
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#include "gdbcore.h"
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extern int xfer_memory ();
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extern void child_attach (), child_create_inferior ();
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extern int sys_nerr;
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extern char *sys_errlist[];
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extern char *sys_siglist[];
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extern char registers[];
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/* Hook for `exec_file_command' command to call. */
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void (*exec_file_display_hook) () = NULL;
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struct section_table *core_sections, *core_sections_end;
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/* Binary file diddling handle for the core file. */
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bfd *core_bfd = NULL;
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/* Forward decl */
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extern struct target_ops core_ops;
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/* Discard all vestiges of any previous core file
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and mark data and stack spaces as empty. */
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1991-05-02 06:28:42 +02:00
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/* ARGSUSED */
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1991-03-28 17:28:29 +01:00
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void
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core_close (quitting)
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int quitting;
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{
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if (core_bfd) {
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free (bfd_get_filename (core_bfd));
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bfd_close (core_bfd);
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core_bfd = NULL;
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1991-04-23 02:05:24 +02:00
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#ifdef CLEAR_SOLIB
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CLEAR_SOLIB ();
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#endif
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1991-03-28 17:28:29 +01:00
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}
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}
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/* This routine opens and sets up the core file bfd */
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void
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core_open (filename, from_tty)
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char *filename;
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int from_tty;
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{
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1991-07-19 08:45:19 +02:00
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const char *p;
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1991-03-28 17:28:29 +01:00
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int siggy;
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struct cleanup *old_chain;
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char *temp;
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bfd *temp_bfd;
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int ontop;
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1991-04-19 03:36:57 +02:00
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target_preopen (from_tty);
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1991-03-28 17:28:29 +01:00
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if (!filename)
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{
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error (core_bfd?
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"No core file specified. (Use `detach' to stop debugging a core file.)"
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: "No core file specified.");
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}
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filename = tilde_expand (filename);
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if (filename[0] != '/') {
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temp = concat (current_directory, "/", filename);
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free (filename);
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filename = temp;
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}
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old_chain = make_cleanup (free, filename);
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temp_bfd = bfd_openr (filename, NULL);
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if (temp_bfd == NULL)
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{
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perror_with_name (filename);
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}
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if (!bfd_check_format (temp_bfd, bfd_core))
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{
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bfd_close (temp_bfd);
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error ("\"%s\" does not appear to be a core dump", filename);
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}
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/* Looks semi-reasonable. Toss the old core file and work on the new. */
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discard_cleanups (old_chain); /* Don't free filename any more */
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unpush_target (&core_ops);
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core_bfd = temp_bfd;
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old_chain = make_cleanup (core_close, core_bfd);
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validate_files ();
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/* Find the data section */
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if (build_section_table (core_bfd, &core_sections, &core_sections_end))
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error ("Can't find sections in `%s': %s", bfd_get_filename(core_bfd),
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bfd_errmsg (bfd_error));
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ontop = !push_target (&core_ops);
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1991-04-23 04:19:43 +02:00
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make_cleanup (unpush_target, &core_ops);
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1991-03-28 17:28:29 +01:00
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p = bfd_core_file_failing_command (core_bfd);
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if (p)
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printf ("Core file invoked as `%s'.\n", p);
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siggy = bfd_core_file_failing_signal (core_bfd);
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if (siggy > 0)
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printf ("Program terminated with signal %d, %s.\n", siggy,
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siggy < NSIG ? sys_siglist[siggy] : "(undocumented)");
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if (ontop) {
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/* Fetch all registers from core file */
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target_fetch_registers (-1);
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1991-05-05 01:15:02 +02:00
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/* Add symbols for any shared libraries that were in use */
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1991-04-23 02:05:24 +02:00
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#ifdef SOLIB_ADD
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SOLIB_ADD (NULL, from_tty);
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#endif
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1991-05-05 01:15:02 +02:00
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/* Now, set up the frame cache, and print the top of stack */
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set_current_frame ( create_new_frame (read_register (FP_REGNUM),
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read_pc ()));
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select_frame (get_current_frame (), 0);
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1991-03-28 17:28:29 +01:00
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print_sel_frame (0); /* Print the top frame and source line */
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} else {
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printf (
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"Warning: you won't be able to access this core file until you terminate\n\
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your %s; do ``info files''\n", current_target->to_longname);
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}
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discard_cleanups (old_chain);
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}
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void
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core_detach (args, from_tty)
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char *args;
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int from_tty;
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{
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if (args)
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error ("Too many arguments");
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1991-04-05 11:02:10 +02:00
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unpush_target (&core_ops);
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1991-03-28 17:28:29 +01:00
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if (from_tty)
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printf ("No core file now.\n");
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}
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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 (filename, from_tty)
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char *filename;
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int from_tty;
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{
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1991-04-05 11:02:10 +02:00
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dont_repeat (); /* Either way, seems bogus. */
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1991-03-28 17:28:29 +01:00
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if (!filename)
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core_detach (filename, from_tty);
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else
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core_open (filename, from_tty);
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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 (hook)
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void (*hook) ();
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{
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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 ()
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{
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#ifdef 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 ()
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{
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#ifdef FIXME
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if (exec_bfd)
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bfd_reopen (exec_bfd);
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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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This should really check that the core file came
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from that exec file, but I don't know how to do it. */
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void
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validate_files ()
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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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printf ("Warning: core file does not match specified executable file.\n");
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else if (bfd_get_mtime(exec_bfd) > bfd_get_mtime(core_bfd))
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printf ("Warning: exec file is newer than core file.\n");
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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 (err)
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int err;
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{
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if (exec_bfd) return bfd_get_filename(exec_bfd);
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if (!err) 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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static void
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core_files_info ()
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{
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struct section_table *p;
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printf ("\tCore file `%s'.\n", bfd_get_filename(core_bfd));
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for (p = core_sections; p < core_sections_end; p++)
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printf("\tcore file from 0x%08x to 0x%08x is %s\n",
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p->addr, p->endaddr,
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bfd_section_name (core_bfd, p->sec_ptr));
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}
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void
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memory_error (status, memaddr)
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int status;
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CORE_ADDR memaddr;
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{
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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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1991-07-09 04:08:13 +02:00
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error ("Cannot access memory at address 0x%x.", memaddr);
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1991-03-28 17:28:29 +01:00
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}
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else
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{
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if (status >= sys_nerr || status < 0)
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error ("Error accessing memory address 0x%x: unknown error (%d).",
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memaddr, status);
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else
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error ("Error accessing memory address 0x%x: %s.",
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memaddr, sys_errlist[status]);
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}
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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 (memaddr, myaddr, len)
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CORE_ADDR memaddr;
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char *myaddr;
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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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/* Same as target_write_memory, but report an error if can't write. */
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void
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write_memory (memaddr, myaddr, len)
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CORE_ADDR memaddr;
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char *myaddr;
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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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long
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read_memory_integer (memaddr, len)
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CORE_ADDR memaddr;
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int len;
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{
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char cbuf;
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short sbuf;
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int ibuf;
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long lbuf;
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if (len == sizeof (char))
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{
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|
read_memory (memaddr, &cbuf, len);
|
|
|
|
|
return cbuf;
|
|
|
|
|
}
|
|
|
|
|
if (len == sizeof (short))
|
|
|
|
|
{
|
|
|
|
|
read_memory (memaddr, (char *)&sbuf, len);
|
|
|
|
|
SWAP_TARGET_AND_HOST (&sbuf, sizeof (short));
|
|
|
|
|
return sbuf;
|
|
|
|
|
}
|
|
|
|
|
if (len == sizeof (int))
|
|
|
|
|
{
|
|
|
|
|
read_memory (memaddr, (char *)&ibuf, len);
|
|
|
|
|
SWAP_TARGET_AND_HOST (&ibuf, sizeof (int));
|
|
|
|
|
return ibuf;
|
|
|
|
|
}
|
|
|
|
|
if (len == sizeof (lbuf))
|
|
|
|
|
{
|
|
|
|
|
read_memory (memaddr, (char *)&lbuf, len);
|
|
|
|
|
SWAP_TARGET_AND_HOST (&lbuf, sizeof (lbuf));
|
|
|
|
|
return lbuf;
|
|
|
|
|
}
|
|
|
|
|
error ("Cannot handle integers of %d bytes.", len);
|
|
|
|
|
return -1; /* for lint */
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Read or write the core file.
|
|
|
|
|
|
|
|
|
|
Args are address within core file, address within gdb address-space,
|
|
|
|
|
length, and a flag indicating whether to read or write.
|
|
|
|
|
|
|
|
|
|
Result is a length:
|
|
|
|
|
|
|
|
|
|
0: We cannot handle this address and length.
|
|
|
|
|
> 0: We have handled N bytes starting at this address.
|
|
|
|
|
(If N == length, we did it all.) We might be able
|
|
|
|
|
to handle more bytes beyond this length, but no
|
|
|
|
|
promises.
|
|
|
|
|
< 0: We cannot handle this address, but if somebody
|
|
|
|
|
else handles (-N) bytes, we can start from there.
|
|
|
|
|
|
|
|
|
|
The actual work is done by xfer_memory in exec.c, which we share
|
|
|
|
|
in common with exec_xfer_memory(). */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
core_xfer_memory (memaddr, myaddr, len, write)
|
|
|
|
|
CORE_ADDR memaddr;
|
|
|
|
|
char *myaddr;
|
|
|
|
|
int len;
|
|
|
|
|
int write;
|
|
|
|
|
{
|
1991-04-23 02:05:24 +02:00
|
|
|
|
int res;
|
|
|
|
|
res = xfer_memory (memaddr, myaddr, len, write,
|
1991-03-28 17:28:29 +01:00
|
|
|
|
core_bfd, core_sections, core_sections_end);
|
1991-04-23 02:05:24 +02:00
|
|
|
|
#ifdef SOLIB_XFER_MEMORY
|
|
|
|
|
if (res == 0)
|
|
|
|
|
res = SOLIB_XFER_MEMORY (memaddr, myaddr, len, write);
|
|
|
|
|
#endif
|
|
|
|
|
return res;
|
1991-03-28 17:28:29 +01:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Get the registers out of a core file. This is the machine-
|
|
|
|
|
independent part. Fetch_core_registers is the machine-dependent
|
|
|
|
|
part, typically implemented in the xm-file for each architecture. */
|
|
|
|
|
|
1991-05-02 06:28:42 +02:00
|
|
|
|
/* We just get all the registers, so we don't use regno. */
|
|
|
|
|
/* ARGSUSED */
|
1991-05-05 01:15:02 +02:00
|
|
|
|
static void
|
1991-03-28 17:28:29 +01:00
|
|
|
|
get_core_registers (regno)
|
|
|
|
|
int regno;
|
|
|
|
|
{
|
|
|
|
|
sec_ptr reg_sec;
|
|
|
|
|
unsigned size;
|
|
|
|
|
char *the_regs;
|
|
|
|
|
|
|
|
|
|
reg_sec = bfd_get_section_by_name (core_bfd, ".reg");
|
|
|
|
|
size = bfd_section_size (core_bfd, reg_sec);
|
|
|
|
|
the_regs = alloca (size);
|
|
|
|
|
if (bfd_get_section_contents (core_bfd, reg_sec, the_regs,
|
|
|
|
|
(unsigned)0, size))
|
|
|
|
|
{
|
|
|
|
|
fetch_core_registers (the_regs, size, 0);
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
fprintf (stderr, "Couldn't fetch registers from core file: %s\n",
|
|
|
|
|
bfd_errmsg (bfd_error));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Now do it again for the float registers, if they exist. */
|
|
|
|
|
reg_sec = bfd_get_section_by_name (core_bfd, ".reg2");
|
|
|
|
|
if (reg_sec) {
|
|
|
|
|
size = bfd_section_size (core_bfd, reg_sec);
|
|
|
|
|
the_regs = alloca (size);
|
|
|
|
|
if (bfd_get_section_contents (core_bfd, reg_sec, the_regs,
|
|
|
|
|
(unsigned)0, size))
|
|
|
|
|
{
|
|
|
|
|
fetch_core_registers (the_regs, size, 2);
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
fprintf (stderr, "Couldn't fetch register set 2 from core file: %s\n",
|
|
|
|
|
bfd_errmsg (bfd_error));
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
registers_fetched();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
struct target_ops core_ops = {
|
|
|
|
|
"core", "Local core dump file",
|
1991-04-19 03:36:57 +02:00
|
|
|
|
"Use a core file as a target. Specify the filename of the core file.",
|
1991-03-28 17:28:29 +01:00
|
|
|
|
core_open, core_close,
|
|
|
|
|
child_attach, core_detach, 0, 0, /* resume, wait */
|
|
|
|
|
get_core_registers,
|
|
|
|
|
0, 0, 0, 0, /* store_regs, prepare_to_store, conv_to, conv_from */
|
|
|
|
|
core_xfer_memory, core_files_info,
|
|
|
|
|
0, 0, /* core_insert_breakpoint, core_remove_breakpoint, */
|
|
|
|
|
0, 0, 0, 0, 0, /* terminal stuff */
|
|
|
|
|
0, 0, 0, 0, 0, /* kill, load, add_syms, call fn, lookup sym */
|
|
|
|
|
child_create_inferior, 0, /* mourn_inferior */
|
|
|
|
|
core_stratum, 0, /* next */
|
|
|
|
|
0, 1, 1, 1, 0, /* all mem, mem, stack, regs, exec */
|
|
|
|
|
OPS_MAGIC, /* Always the last thing */
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
_initialize_core()
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
add_com ("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.");
|
|
|
|
|
add_target (&core_ops);
|
|
|
|
|
}
|