132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/* Low level interface to ptrace, for GDB when running under Unix.
|
||
Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program 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.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "frame.h"
|
||
#include "inferior.h"
|
||
|
||
#include <sys/param.h>
|
||
#include <sys/dir.h>
|
||
#include <signal.h>
|
||
#include <sys/user.h>
|
||
#include <sys/ioctl.h>
|
||
#include <fcntl.h>
|
||
|
||
#include "gdbcore.h"
|
||
|
||
#include <sys/file.h>
|
||
#include <sys/stat.h>
|
||
|
||
|
||
/* Work with core dump and executable files, for GDB.
|
||
This code would be in core.c if it weren't machine-dependent. */
|
||
|
||
void
|
||
core_file_command (filename, from_tty)
|
||
char *filename;
|
||
int from_tty;
|
||
{
|
||
int val;
|
||
extern char registers[];
|
||
|
||
/* Discard all vestiges of any previous core file
|
||
and mark data and stack spaces as empty. */
|
||
|
||
if (corefile)
|
||
free (corefile);
|
||
corefile = 0;
|
||
|
||
if (corechan >= 0)
|
||
close (corechan);
|
||
corechan = -1;
|
||
|
||
data_start = 0;
|
||
data_end = 0;
|
||
stack_start = STACK_END_ADDR;
|
||
stack_end = STACK_END_ADDR;
|
||
|
||
/* Now, if a new core file was specified, open it and digest it. */
|
||
|
||
if (filename)
|
||
{
|
||
filename = tilde_expand (filename);
|
||
make_cleanup (free, filename);
|
||
|
||
if (have_inferior_p ())
|
||
error ("To look at a core file, you must kill the program with \"kill\".");
|
||
corechan = open (filename, O_RDONLY, 0);
|
||
if (corechan < 0)
|
||
perror_with_name (filename);
|
||
/* 4.2-style (and perhaps also sysV-style) core dump file. */
|
||
{
|
||
struct user u;
|
||
int reg_offset;
|
||
|
||
val = myread (corechan, &u, sizeof u);
|
||
if (val < 0)
|
||
perror_with_name (filename);
|
||
data_start = exec_data_start;
|
||
|
||
data_end = data_start + NBPG * u.u_dsize;
|
||
stack_start = stack_end - NBPG * u.u_ssize;
|
||
data_offset = NBPG * UPAGES;
|
||
stack_offset = NBPG * (UPAGES + u.u_dsize);
|
||
reg_offset = (int) u.u_ar0 - KERNEL_U_ADDR;
|
||
|
||
/* I don't know where to find this info.
|
||
So, for now, mark it as not available. */
|
||
core_aouthdr.a_magic = 0;
|
||
|
||
/* Read the register values out of the core file and store
|
||
them where `read_register' will find them. */
|
||
|
||
{
|
||
register int regno;
|
||
|
||
for (regno = 0; regno < NUM_REGS; regno++)
|
||
{
|
||
char buf[MAX_REGISTER_RAW_SIZE];
|
||
|
||
val = lseek (corechan, register_addr (regno, reg_offset), 0);
|
||
if (val < 0)
|
||
perror_with_name (filename);
|
||
|
||
val = myread (corechan, buf, sizeof buf);
|
||
if (val < 0)
|
||
perror_with_name (filename);
|
||
supply_register (regno, buf);
|
||
}
|
||
}
|
||
}
|
||
if (filename[0] == '/')
|
||
corefile = savestring (filename, strlen (filename));
|
||
else
|
||
{
|
||
corefile = concat (current_directory, "/", filename, NULL);
|
||
}
|
||
|
||
set_current_frame ( create_new_frame (read_register (FP_REGNUM),
|
||
read_pc ()));
|
||
select_frame (get_current_frame (), 0);
|
||
validate_files ();
|
||
}
|
||
else if (from_tty)
|
||
printf ("No core file now.\n");
|
||
}
|