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/* $OpenBSD: exec_aout.c,v 1.11 2011/10/02 22:20:49 edd 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.
*/
#include <sys/types.h>
#include <sys/exec.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <nlist.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "ukc.h"
caddr_t aout_p, aout_r;
unsigned long aout_psz = 0, aout_rsz = 0;
struct exec aout_ex;
unsigned long aout_adjvalue = 0;
unsigned long aout_datashift = 0;
void
aout_computeadj(void)
{
aout_adjvalue = (unsigned long)aout_p +
N_TXTOFF(aout_ex) - nl[P_KERNEL_TEXT].n_value;
/*
* On m68k a.out ZMAGIC kernel, kernel_text begins _after_ the a.out
* header, so compensate for it.
*/
if (nl[P_KERNEL_TEXT].n_value & (__LDPGSZ - 1))
aout_adjvalue += sizeof(aout_ex);
/*
* On NMAGIC kernel, we need an extra relocation for the data area
*/
aout_datashift = (N_DATADDR(aout_ex) - N_TXTADDR(aout_ex)) -
aout_ex.a_text;
}
/* ``kernel'' vaddr -> in-memory address */
caddr_t
aout_adjust(caddr_t x)
{
if (aout_adjvalue == 0)
aout_computeadj();
if (aout_datashift != 0 &&
(unsigned long)x >= N_DATADDR(aout_ex) - N_TXTADDR(aout_ex))
x -= aout_datashift;
return (x + aout_adjvalue);
}
/* in-memory address -> ``kernel'' vaddr */
caddr_t
aout_readjust(caddr_t x)
{
caddr_t y;
#if 0 /* unnecessary, aout_adjust() is always invoked first */
if (aout_adjvalue == 0)
aout_computeadj();
#endif
y = x - aout_adjvalue;
if (aout_datashift != 0 &&
(unsigned long)y >= N_TXTADDR(aout_ex) + aout_ex.a_text)
y += aout_datashift;
return (y);
}
int
aout_check(char *file)
{
int fd, ret = 1;
if ((fd = open(file, O_RDONLY | O_EXLOCK, 0)) < 0)
return (0);
if (read(fd, (char *)&aout_ex, sizeof(aout_ex)) != sizeof(aout_ex))
ret = 0;
if (ret) {
if (N_BADMAG(aout_ex))
ret = 0;
}
close(fd);
return (ret);
}
void
aout_loadkernel(char *file)
{
int fd;
off_t cur, end;
if ((fd = open(file, O_RDONLY | O_EXLOCK, 0)) < 0)
err(1, "%s", file);
if (read(fd, (char *)&aout_ex, sizeof(aout_ex)) != sizeof(aout_ex))
errx(1, "can't read a.out header");
if (N_BADMAG(aout_ex))
errx(1, "bad a.out magic");
lseek(fd, (off_t)0, SEEK_SET);
aout_psz = (int)(aout_ex.a_text + N_TXTOFF(aout_ex) +
aout_ex.a_data);
aout_p = emalloc(aout_psz);
if (read(fd, aout_p, aout_psz) != aout_psz)
errx(1, "can't read a.out text and data");
cur = lseek(fd, (off_t)0, SEEK_CUR);
end = lseek(fd, (off_t)0, SEEK_END);
(void)lseek(fd, cur, SEEK_SET);
aout_rsz = (int)(end - cur);
aout_r = emalloc(aout_rsz);
if (read(fd, aout_r, aout_rsz) != aout_rsz)
errx(1, "can't read rest of file %s", file);
close(fd);
}
void
aout_savekernel(char *outfile)
{
int fd;
if ((fd = open(outfile, O_WRONLY | O_CREAT | O_TRUNC, 0755)) < 0)
err(1, "%s", outfile);
if (write(fd, aout_p, aout_psz) != aout_psz)
errx(1, "can't write a.out text and data");
if (write(fd, aout_r, aout_rsz) != aout_rsz)
errx(1, "can't write rest of file %s", outfile);
close(fd);
}
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