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/* $OpenBSD: exec_ecoff.c,v 1.9 2003/09/26 17:00:27 deraadt Exp $ */
/*
* Copyright (c) 1999 Mats O Jansson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef LINT
static char rcsid[] = "$OpenBSD: exec_ecoff.c,v 1.9 2003/09/26 17:00:27 deraadt Exp $";
#endif
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <nlist.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/exec.h>
#include <sys/exec_ecoff.h>
#include <sys/types.h>
#include "config.h"
#include "ukc.h"
caddr_t ecoff_p, ecoff_r, ecoff_b;
int ecoff_psz = 0, ecoff_rsz = 0, ecoff_bsz = 0;
struct ecoff_exechdr ecoff_ex;
caddr_t
ecoff_adjust(caddr_t x)
{
unsigned long y;
y = (unsigned long)x - nl[P_KERNEL_TEXT].n_value + (unsigned long)ecoff_p;
return((caddr_t)y);
}
caddr_t
ecoff_readjust(caddr_t x)
{
unsigned long y;
y = (unsigned long)x - (unsigned long)ecoff_p + nl[P_KERNEL_TEXT].n_value;
return((caddr_t)y);
}
int
ecoff_check(char *file)
{
int fd, ret = 1;
if ((fd = open(file, O_RDONLY | O_EXLOCK, 0)) < 0)
return (0);
if (read(fd,(char *)&ecoff_ex, sizeof(ecoff_ex)) != sizeof(ecoff_ex))
ret = 0;
if (ret) {
if (ECOFF_BADMAG(&ecoff_ex))
ret = 0;
}
close(fd);
return (ret);
}
void
ecoff_loadkernel(char *file)
{
int fd;
off_t beg, cur, end;
if ((fd = open(file, O_RDONLY | O_EXLOCK, 0)) < 0)
err(1, "%s", file);
if (read(fd, (char *)&ecoff_ex, sizeof(ecoff_ex)) != sizeof(ecoff_ex))
errx(1, "can't read ecoff header");
if (ECOFF_BADMAG(&ecoff_ex))
errx(1, "bad ecoff magic");
ecoff_psz = ecoff_ex.a.tsize + ecoff_ex.a.dsize;
beg = lseek(fd, ECOFF_TXTOFF(&ecoff_ex), SEEK_SET);
ecoff_bsz = (int)beg;
ecoff_b = emalloc(ecoff_bsz);
ecoff_p = emalloc(ecoff_psz);
if (read(fd, ecoff_p, ecoff_psz) != ecoff_psz)
errx(1, "can't read ecoff text and data");
cur = lseek(fd, (off_t)0, SEEK_CUR);
end = lseek(fd, (off_t)0, SEEK_END);
(void)lseek(fd, (off_t)0, SEEK_SET);
if (read(fd, ecoff_b, ecoff_bsz) != ecoff_bsz)
errx(1, "can't read begining of file %s", file);
(void)lseek(fd, cur, SEEK_SET);
ecoff_rsz = (int)(end - cur);
ecoff_r = emalloc(ecoff_rsz);
if (read(fd, ecoff_r, ecoff_rsz) != ecoff_rsz)
errx(1, "can't read rest of file %s", file);
close(fd);
}
void
ecoff_savekernel(char *outfile)
{
int fd;
if ((fd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0755)) < 0)
err(1, "%s", outfile);
if (write(fd, ecoff_b, ecoff_bsz) != ecoff_bsz)
errx(1, "can't write beginning of file %s",outfile);
if (write(fd, ecoff_p, ecoff_psz) != ecoff_psz)
errx(1, "can't write ecoff text and data");
if (write(fd, ecoff_r, ecoff_rsz) != ecoff_rsz)
errx(1, "can't write rest of file %s", outfile);
close(fd);
}
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