582 lines
14 KiB
C
582 lines
14 KiB
C
/*-
|
||
* This code is derived from software copyrighted by the Free Software
|
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* Foundation.
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*
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* Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
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* Modified 1990 by Van Jacobson at Lawrence Berkeley Laboratory.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)core.c 6.3 (Berkeley) 5/8/91";
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#endif /* not lint */
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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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||
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This file is part of GDB.
|
||
|
||
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
|
||
the Free Software Foundation; either version 1, or (at your option)
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any later version.
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||
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||
GDB is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
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||
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||
You should have received a copy of the GNU General Public License
|
||
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 "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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#ifdef USG
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#include <sys/types.h>
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#include <fcntl.h>
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#endif
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#ifdef COFF_ENCAPSULATE
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#include "a.out.encap.h"
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#else
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#include <a.out.h>
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#endif
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#ifndef N_MAGIC
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#ifdef COFF_FORMAT
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#define N_MAGIC(exec) ((exec).magic)
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#else
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#define N_MAGIC(exec) ((exec).a_magic)
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#endif
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#endif
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#include <signal.h>
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#ifdef UMAX_CORE
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#include <sys/ptrace.h>
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#else
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#include <sys/user.h>
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#endif
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#ifndef N_TXTADDR
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#define N_TXTADDR(hdr) 0
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#endif /* no N_TXTADDR */
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#ifndef N_DATADDR
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#define N_DATADDR(hdr) hdr.a_text
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#endif /* no N_DATADDR */
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#ifndef COFF_FORMAT
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#ifndef AOUTHDR
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#define AOUTHDR struct exec
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#endif
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#endif
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extern char *sys_siglist[];
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extern core_file_command (), exec_file_command ();
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/* Hook for `exec_file_command' command to call. */
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void (*exec_file_display_hook) ();
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/* File names of core file and executable file. */
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char *corefile;
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char *execfile;
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/* Descriptors on which core file and executable file are open.
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Note that the execchan is closed when an inferior is created
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and reopened if the inferior dies or is killed. */
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int corechan;
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int execchan;
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/* Last modification time of executable file.
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Also used in source.c to compare against mtime of a source file. */
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int exec_mtime;
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/* Virtual addresses of bounds of the two areas of memory in the core file. */
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CORE_ADDR data_start;
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CORE_ADDR data_end;
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CORE_ADDR stack_start;
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CORE_ADDR stack_end;
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#if defined (REG_STACK_SEGMENT)
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/* Start and end of the register stack segment. */
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CORE_ADDR reg_stack_start;
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CORE_ADDR reg_stack_end;
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#endif /* REG_STACK_SEGMENT */
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/* Virtual addresses of bounds of two areas of memory in the exec file.
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Note that the data area in the exec file is used only when there is no core file. */
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CORE_ADDR text_start;
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CORE_ADDR text_end;
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CORE_ADDR exec_data_start;
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CORE_ADDR exec_data_end;
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/* Offset within executable file of start of text area data. */
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int text_offset;
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/* Offset within executable file of start of data area data. */
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int exec_data_offset;
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/* Offset within core file of start of data area data. */
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int data_offset;
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/* Offset within core file of start of stack area data. */
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int stack_offset;
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#ifdef COFF_FORMAT
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/* various coff data structures */
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FILHDR file_hdr;
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SCNHDR text_hdr;
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SCNHDR data_hdr;
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#endif /* not COFF_FORMAT */
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/* a.out header saved in core file. */
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AOUTHDR core_aouthdr;
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/* a.out header of exec file. */
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AOUTHDR exec_aouthdr;
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void validate_files ();
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unsigned int register_addr ();
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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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if (execchan >= 0)
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close (execchan);
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execchan = -1;
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}
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void
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reopen_exec_file ()
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{
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if (execchan < 0 && execfile != 0)
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{
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char *filename = concat (execfile, "", "");
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exec_file_command (filename, 0);
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free (filename);
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}
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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 (execfile != 0 && corefile != 0)
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{
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struct stat st_core;
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if (fstat (corechan, &st_core) < 0)
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/* It might be a good idea to print an error message.
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On the other hand, if the user tries to *do* anything with
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the core file, (s)he'll find out soon enough. */
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return;
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if (N_MAGIC (core_aouthdr) != 0
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&& bcmp (&core_aouthdr, &exec_aouthdr, sizeof core_aouthdr))
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printf ("Warning: core file does not match specified executable file.\n");
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else if (exec_mtime > st_core.st_mtime) {
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#ifdef KERNELDEBUG
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extern int kernel_debugging;
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if (!kernel_debugging)
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#endif
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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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}
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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 (err && execfile == 0)
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error ("No executable file specified.\n\
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Use the \"exec-file\" and \"symbol-file\" commands.");
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return execfile;
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}
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int
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have_core_file_p ()
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{
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return corefile != 0;
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}
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static void
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files_info ()
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{
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char *symfile;
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extern char *get_sym_file ();
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if (execfile)
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printf ("Executable file \"%s\".\n", execfile);
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else
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printf ("No executable file\n");
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if (corefile == 0)
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printf ("No core dump file\n");
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else
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printf ("Core dump file \"%s\".\n", corefile);
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if (have_inferior_p ())
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printf ("Using the running image of the program, rather than these files.\n");
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symfile = get_sym_file ();
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if (symfile != 0)
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printf ("Symbols from \"%s\".\n", symfile);
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#ifdef FILES_INFO_HOOK
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if (FILES_INFO_HOOK ())
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return;
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#endif
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if (! have_inferior_p ())
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{
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if (execfile)
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{
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printf ("Text segment in executable from 0x%x to 0x%x.\n",
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text_start, text_end);
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printf ("Data segment in executable from 0x%x to 0x%x.\n",
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exec_data_start, exec_data_end);
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if (corefile)
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printf ("(But since we have a core file, we're using...)\n");
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}
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if (corefile)
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{
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printf ("Data segment in core file from 0x%x to 0x%x.\n",
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data_start, data_end);
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printf ("Stack segment in core file from 0x%x to 0x%x.\n",
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stack_start, stack_end);
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}
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}
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}
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/* Read "memory data" from core file and/or executable file.
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Returns zero if successful, 1 if xfer_core_file failed, errno value if
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ptrace failed. */
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int
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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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if (len == 0)
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return 0;
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if (have_inferior_p ())
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{
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if (remote_debugging)
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return remote_read_inferior_memory (memaddr, myaddr, len);
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else
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return read_inferior_memory (memaddr, myaddr, len);
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}
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else
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return xfer_core_file (memaddr, myaddr, len);
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}
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/* Write LEN bytes of data starting at address MYADDR
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into debugged program memory at address MEMADDR.
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Returns zero if successful, or an errno value if ptrace failed. */
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int
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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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if (have_inferior_p ())
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{
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if (remote_debugging)
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return remote_write_inferior_memory (memaddr, myaddr, len);
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else
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return write_inferior_memory (memaddr, myaddr, len);
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}
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else
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error ("Can write memory only when program being debugged is running.");
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}
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#ifndef XFER_CORE_FILE
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int (*core_file_hook)(); /* hook to handle special core files like
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like /dev/mem and crash dumps */
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/* Read from the program's memory (except for inferior processes).
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This function is misnamed, since it only reads, never writes; and
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since it will use the core file and/or executable file as necessary.
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It should be extended to write as well as read, FIXME, for patching files.
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Return 0 if address could be read, 1 if not. */
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int
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xfer_core_file (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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register int i;
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register int val;
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||
int xferchan;
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char **xferfile;
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int fileptr;
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||
int returnval = 0;
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||
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||
if (core_file_hook)
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return ((*core_file_hook)(memaddr, myaddr, len));
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|
||
while (len > 0)
|
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{
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||
xferfile = 0;
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xferchan = 0;
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||
|
||
/* Determine which file the next bunch of addresses reside in,
|
||
and where in the file. Set the file's read/write pointer
|
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to point at the proper place for the desired address
|
||
and set xferfile and xferchan for the correct file.
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||
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||
If desired address is nonexistent, leave them zero.
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i is set to the number of bytes that can be handled
|
||
along with the next address.
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||
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||
We put the most likely tests first for efficiency. */
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||
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||
/* Note that if there is no core file
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||
data_start and data_end are equal. */
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||
if (memaddr >= data_start && memaddr < data_end)
|
||
{
|
||
i = min (len, data_end - memaddr);
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fileptr = memaddr - data_start + data_offset;
|
||
xferfile = &corefile;
|
||
xferchan = corechan;
|
||
}
|
||
/* Note that if there is no core file
|
||
stack_start and stack_end are equal. */
|
||
else if (memaddr >= stack_start && memaddr < stack_end)
|
||
{
|
||
i = min (len, stack_end - memaddr);
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||
fileptr = memaddr - stack_start + stack_offset;
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||
xferfile = &corefile;
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||
xferchan = corechan;
|
||
}
|
||
#ifdef REG_STACK_SEGMENT
|
||
/* Pyramids have an extra segment in the virtual address space
|
||
for the (control) stack of register-window frames */
|
||
else if (memaddr >= reg_stack_start && memaddr < reg_stack_end)
|
||
{
|
||
i = min (len, reg_stack_end - memaddr);
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||
fileptr = memaddr - reg_stack_start + reg_stack_offset;
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||
xferfile = &corefile;
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||
xferchan = corechan;
|
||
}
|
||
#endif /* REG_STACK_SEGMENT */
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||
|
||
else if (corechan < 0
|
||
&& memaddr >= exec_data_start && memaddr < exec_data_end)
|
||
{
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||
i = min (len, exec_data_end - memaddr);
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fileptr = memaddr - exec_data_start + exec_data_offset;
|
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xferfile = &execfile;
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xferchan = execchan;
|
||
}
|
||
else if (memaddr >= text_start && memaddr < text_end)
|
||
{
|
||
i = min (len, text_end - memaddr);
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fileptr = memaddr - text_start + text_offset;
|
||
xferfile = &execfile;
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||
xferchan = execchan;
|
||
}
|
||
else if (memaddr < text_start)
|
||
{
|
||
i = min (len, text_start - memaddr);
|
||
}
|
||
else if (memaddr >= text_end
|
||
&& memaddr < (corechan >= 0? data_start : exec_data_start))
|
||
{
|
||
i = min (len, data_start - memaddr);
|
||
}
|
||
else if (corechan >= 0
|
||
&& memaddr >= data_end && memaddr < stack_start)
|
||
{
|
||
i = min (len, stack_start - memaddr);
|
||
}
|
||
else if (corechan < 0 && memaddr >= exec_data_end)
|
||
{
|
||
/* Since there is nothing at higher addresses than data
|
||
(without a core file or an inferior, there is no
|
||
stack, set i to do the rest of the operation now. */
|
||
i = len;
|
||
}
|
||
#ifdef REG_STACK_SEGMENT
|
||
else if (memaddr >= reg_stack_end && reg_stack_end != 0)
|
||
{
|
||
i = min (len, reg_stack_start - memaddr);
|
||
}
|
||
else if (memaddr >= stack_end && memaddr < reg_stack_start)
|
||
#else /* no REG_STACK_SEGMENT. */
|
||
else if (memaddr >= stack_end && stack_end != 0)
|
||
#endif /* no REG_STACK_SEGMENT. */
|
||
{
|
||
/* Since there is nothing at higher addresses than
|
||
the stack, set i to do the rest of the operation now. */
|
||
i = len;
|
||
}
|
||
else
|
||
{
|
||
/* Address did not classify into one of the known ranges.
|
||
This shouldn't happen; we catch the endpoints. */
|
||
fatal ("Internal: Bad case logic in xfer_core_file.");
|
||
}
|
||
|
||
/* Now we know which file to use.
|
||
Set up its pointer and transfer the data. */
|
||
if (xferfile)
|
||
{
|
||
if (*xferfile == 0)
|
||
if (xferfile == &execfile)
|
||
error ("No program file to examine.");
|
||
else
|
||
error ("No core dump file or running program to examine.");
|
||
val = lseek (xferchan, fileptr, 0);
|
||
if (val == -1)
|
||
perror_with_name (*xferfile);
|
||
val = myread (xferchan, myaddr, i);
|
||
if (val < 0)
|
||
perror_with_name (*xferfile);
|
||
}
|
||
/* If this address is for nonexistent memory,
|
||
read zeros if reading, or do nothing if writing.
|
||
Actually, we never right. */
|
||
else
|
||
{
|
||
bzero (myaddr, i);
|
||
returnval = 1;
|
||
}
|
||
|
||
memaddr += i;
|
||
myaddr += i;
|
||
len -= i;
|
||
}
|
||
return returnval;
|
||
}
|
||
#endif /* XFER_CORE_FILE */
|
||
|
||
/* My replacement for the read system call.
|
||
Used like `read' but keeps going if `read' returns too soon. */
|
||
|
||
int
|
||
myread (desc, addr, len)
|
||
int desc;
|
||
char *addr;
|
||
int len;
|
||
{
|
||
register int val;
|
||
int orglen = len;
|
||
|
||
while (len > 0)
|
||
{
|
||
val = read (desc, addr, len);
|
||
if (val < 0)
|
||
return val;
|
||
if (val == 0)
|
||
return orglen - len;
|
||
len -= val;
|
||
addr += val;
|
||
}
|
||
return orglen;
|
||
}
|
||
|
||
#ifdef REGISTER_U_ADDR
|
||
|
||
/* Return the address in the core dump or inferior of register REGNO.
|
||
BLOCKEND is the address of the end of the user structure. */
|
||
|
||
unsigned int
|
||
register_addr (regno, blockend)
|
||
int regno;
|
||
int blockend;
|
||
{
|
||
int addr;
|
||
|
||
if (regno < 0 || regno >= NUM_REGS)
|
||
error ("Invalid register number %d.", regno);
|
||
|
||
REGISTER_U_ADDR (addr, blockend, regno);
|
||
|
||
return addr;
|
||
}
|
||
|
||
#endif /* REGISTER_U_ADDR */
|
||
|
||
void
|
||
_initialize_core()
|
||
{
|
||
corechan = -1;
|
||
execchan = -1;
|
||
corefile = 0;
|
||
execfile = 0;
|
||
exec_file_display_hook = 0;
|
||
|
||
text_start = 0;
|
||
text_end = 0;
|
||
data_start = 0;
|
||
data_end = 0;
|
||
exec_data_start = 0;
|
||
exec_data_end = 0;
|
||
stack_start = STACK_END_ADDR;
|
||
stack_end = STACK_END_ADDR;
|
||
|
||
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.");
|
||
add_com ("exec-file", class_files, exec_file_command,
|
||
"Use FILE as program for getting contents of pure memory.\n\
|
||
If FILE cannot be found as specified, your execution directory path\n\
|
||
is searched for a command of that name.\n\
|
||
No arg means have no executable file.");
|
||
add_info ("files", files_info, "Names of files being debugged.");
|
||
}
|
||
|