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462 lines
12 KiB
C
462 lines
12 KiB
C
/* 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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GDB 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 1, or (at your option)
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any later version.
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GDB 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 GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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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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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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#ifdef CLEAR_SOLIB
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CLEAR_SOLIB ();
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#endif
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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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char *p;
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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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target_preopen (from_tty);
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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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make_cleanup (unpush_target, &core_ops);
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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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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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#ifdef SOLIB_ADD
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SOLIB_ADD (NULL, from_tty);
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#endif
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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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unpush_target (&core_ops);
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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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dont_repeat (); /* Either way, seems bogus. */
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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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error ("Cannot access memory: address 0x%x out of bounds.", memaddr);
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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);
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return cbuf;
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}
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if (len == sizeof (short))
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{
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read_memory (memaddr, (char *)&sbuf, len);
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SWAP_TARGET_AND_HOST (&sbuf, sizeof (short));
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return sbuf;
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}
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if (len == sizeof (int))
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{
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read_memory (memaddr, (char *)&ibuf, len);
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SWAP_TARGET_AND_HOST (&ibuf, sizeof (int));
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return ibuf;
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}
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if (len == sizeof (lbuf))
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{
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read_memory (memaddr, (char *)&lbuf, len);
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SWAP_TARGET_AND_HOST (&lbuf, sizeof (lbuf));
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return lbuf;
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}
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error ("Cannot handle integers of %d bytes.", len);
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return -1; /* for lint */
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}
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/* Read or write the core file.
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Args are address within core file, address within gdb address-space,
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length, and a flag indicating whether to read or write.
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Result is a length:
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0: We cannot handle this address and length.
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> 0: We have handled N bytes starting at this address.
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(If N == length, we did it all.) We might be able
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to handle more bytes beyond this length, but no
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promises.
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< 0: We cannot handle this address, but if somebody
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else handles (-N) bytes, we can start from there.
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The actual work is done by xfer_memory in exec.c, which we share
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in common with exec_xfer_memory(). */
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static int
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core_xfer_memory (memaddr, myaddr, len, write)
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CORE_ADDR memaddr;
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char *myaddr;
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int len;
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int write;
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{
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int res;
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res = xfer_memory (memaddr, myaddr, len, write,
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core_bfd, core_sections, core_sections_end);
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#ifdef SOLIB_XFER_MEMORY
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if (res == 0)
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res = SOLIB_XFER_MEMORY (memaddr, myaddr, len, write);
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#endif
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return res;
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}
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/* Get the registers out of a core file. This is the machine-
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independent part. Fetch_core_registers is the machine-dependent
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part, typically implemented in the xm-file for each architecture. */
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static int
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get_core_registers (regno)
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int regno;
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{
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sec_ptr reg_sec;
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unsigned size;
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char *the_regs;
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reg_sec = bfd_get_section_by_name (core_bfd, ".reg");
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size = bfd_section_size (core_bfd, reg_sec);
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the_regs = alloca (size);
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if (bfd_get_section_contents (core_bfd, reg_sec, the_regs,
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(unsigned)0, size))
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{
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fetch_core_registers (the_regs, size, 0);
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}
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else
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{
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fprintf (stderr, "Couldn't fetch registers from core file: %s\n",
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bfd_errmsg (bfd_error));
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}
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/* Now do it again for the float registers, if they exist. */
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reg_sec = bfd_get_section_by_name (core_bfd, ".reg2");
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if (reg_sec) {
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size = bfd_section_size (core_bfd, reg_sec);
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the_regs = alloca (size);
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if (bfd_get_section_contents (core_bfd, reg_sec, the_regs,
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(unsigned)0, size))
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{
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fetch_core_registers (the_regs, size, 2);
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}
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else
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{
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fprintf (stderr, "Couldn't fetch register set 2 from core file: %s\n",
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bfd_errmsg (bfd_error));
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}
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}
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registers_fetched();
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return 0; /* FIXME, what result goes here? */
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}
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struct target_ops core_ops = {
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"core", "Local core dump file",
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"Use a core file as a target. Specify the filename of the core file.",
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core_open, core_close,
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child_attach, core_detach, 0, 0, /* resume, wait */
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get_core_registers,
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0, 0, 0, 0, /* store_regs, prepare_to_store, conv_to, conv_from */
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core_xfer_memory, core_files_info,
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0, 0, /* core_insert_breakpoint, core_remove_breakpoint, */
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0, 0, 0, 0, 0, /* terminal stuff */
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0, 0, 0, 0, 0, /* kill, load, add_syms, call fn, lookup sym */
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child_create_inferior, 0, /* mourn_inferior */
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core_stratum, 0, /* next */
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0, 1, 1, 1, 0, /* all mem, mem, stack, regs, exec */
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OPS_MAGIC, /* Always the last thing */
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};
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void
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_initialize_core()
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{
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add_com ("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.");
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add_target (&core_ops);
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}
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