d747e0af3d
* All GDB files that #include defs.h: Removed stdio.h. (defs.h): #include stdio.h. This has been tested by building GDBs for all targets hosted on Sun4. None of the build problems were related to stdio.h inclusion. (n.b. many configurations don't build for other reasons.)
467 lines
11 KiB
C
467 lines
11 KiB
C
/* Work with core dump and executable files, for GDB.
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Copyright 1986, 1987, 1989, 1991, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.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 "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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#ifdef SOLIB_ADD
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static int
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solib_add_stub PARAMS ((char *));
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#endif
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static void
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core_close PARAMS ((int));
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static void
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core_open PARAMS ((char *, int));
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static void
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core_detach PARAMS ((char *, int));
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static void
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get_core_registers PARAMS ((int));
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static void
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core_files_info PARAMS ((struct target_ops *));
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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) PARAMS ((char *)) = NULL;
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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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/* ARGSUSED */
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static 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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if (core_ops.to_sections) {
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free (core_ops.to_sections);
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core_ops.to_sections = NULL;
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core_ops.to_sections_end = NULL;
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}
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}
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}
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#ifdef SOLIB_ADD
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/* Stub function for catch_errors around shared library hacking. */
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static int
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solib_add_stub (from_tty)
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char *from_tty;
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{
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SOLIB_ADD (NULL, (int)from_tty, &core_ops);
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return 0;
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}
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#endif /* SOLIB_ADD */
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/* This routine opens and sets up the core file bfd */
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static 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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const 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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int scratch_chan;
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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, NULL);
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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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scratch_chan = open (filename, write_files? O_RDWR: O_RDONLY, 0);
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if (scratch_chan < 0)
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perror_with_name (filename);
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temp_bfd = bfd_fdopenr (filename, NULL, scratch_chan);
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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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/* Do it after the err msg */
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make_cleanup (bfd_close, temp_bfd);
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error ("\"%s\" is not a core dump: %s", filename, bfd_errmsg(bfd_error));
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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_ops.to_sections,
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&core_ops.to_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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discard_cleanups (old_chain);
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p = bfd_core_file_failing_command (core_bfd);
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if (p)
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printf ("Core was generated by `%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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/* Add symbols and section mappings for any shared libraries */
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#ifdef SOLIB_ADD
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(void) catch_errors (solib_add_stub, (char *)from_tty, (char *)0);
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#endif
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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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print_stack_frame (selected_frame, selected_frame_level, 1);
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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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}
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static 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) PARAMS ((char *));
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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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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 may 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 (t)
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struct target_ops *t;
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{
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print_section_info (t, core_bfd);
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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 (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 at address %s.", local_hex_string(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 %s: unknown error (%d).",
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local_hex_string(memaddr), status);
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else
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error ("Error accessing memory address %s: %s.",
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local_hex_string(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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/* 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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/* We just get all the registers, so we don't use regno. */
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/* ARGSUSED */
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static void
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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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if (!reg_sec) goto cant;
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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, (file_ptr)0, size))
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{
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fetch_core_registers (the_regs, size, 0,
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(unsigned) bfd_section_vma (abfd,reg_sec));
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}
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else
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{
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cant:
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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, (file_ptr)0,
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size))
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{
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fetch_core_registers (the_regs, size, 2,
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(unsigned) bfd_section_vma (abfd,reg_sec));
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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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}
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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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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, /* kill, load, 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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0, 0, /* section pointers */
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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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