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/* $OpenBSD: exec_aout.c,v 1.2 2006/05/20 22:40:46 miod Exp $ */
/*-
* Copyright (c) 1982, 1986, 1990, 1993
* The Regents of the University of California. 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* @(#)boot.c 8.1 (Berkeley) 6/10/93
*/
#include <sys/param.h>
#include <sys/reboot.h>
#include <machine/prom.h>
#include <a.out.h>
#include "stand.h"
#include "libsa.h"
#define SYM_MAGIC 0x6274ef2e
/*ARGSUSED*/
void
exec_aout(char *file, const char *args, int bootdev, int bootunit, int bootpart)
{
char *loadaddr;
int io;
struct exec x;
int cc, magic;
void (*entry)();
char *cp;
int *ip;
io = open(file, 0);
if (io < 0)
return;
/*
* Read in the exec header, and validate it.
*/
if (read(io, (char *)&x, sizeof(x)) != sizeof(x))
goto shread;
if (N_BADMAG(x)) {
errno = EFTYPE;
goto closeout;
}
/*
* note: on the mvme ports, the kernel is linked in such a way that
* its entry point is the first item in .text, and thus a_entry can
* be used to determine both the load address and the entry point.
* (also note that we make use of the fact that the kernel will live
* in a VA == PA range of memory ... otherwise we would take
* loadaddr as a parameter and let the kernel relocate itself!)
*
* note that ZMAGIC files included the a.out header in the text area
* so we must mask that off (has no effect on the other formats)
*/
loadaddr = (void *)(x.a_entry & ~sizeof(x));
cp = loadaddr;
magic = N_GETMAGIC(x);
if (magic == ZMAGIC)
cp += sizeof(x);
entry = (void (*)())cp;
/*
* Read in the text segment.
*/
printf("%d", x.a_text);
cc = x.a_text;
if (magic == ZMAGIC)
cc = cc - sizeof(x); /* a.out header part of text in zmagic */
if (read(io, cp, cc) != cc)
goto shread;
cp += cc;
/*
* NMAGIC may have a gap between text and data.
*/
if (magic == NMAGIC) {
register int mask = N_PAGSIZ(x) - 1;
while ((int)cp & mask)
*cp++ = 0;
}
/*
* Read in the data segment.
*/
printf("+%d", x.a_data);
if (read(io, cp, x.a_data) != x.a_data)
goto shread;
cp += x.a_data;
/*
* Zero out the BSS section.
*/
printf("+%d", x.a_bss);
cc = x.a_bss;
while ((int)cp & 3) {
*cp++ = 0;
--cc;
}
ip = (int *)cp;
cp += cc;
while ((char *)ip < cp)
*ip++ = 0;
/*
* Read in the symbol table and strings.
* (Always set the symtab size word.)
*/
*ip++ = x.a_syms;
cp = (char *) ip;
if (x.a_syms > 0) {
/* Symbol table and string table length word. */
cc = x.a_syms;
printf("+[%d", cc);
cc += sizeof(int); /* strtab length too */
if (read(io, cp, cc) != cc)
goto shread;
cp += x.a_syms;
ip = (int *)cp; /* points to strtab length */
cp += sizeof(int);
/* String table. Length word includes itself. */
cc = *ip;
printf("+%d]", cc);
cc -= sizeof(int);
if (cc <= 0)
goto shread;
if (read(io, cp, cc) != cc)
goto shread;
cp += cc;
}
printf("=0x%lx\n", cp - loadaddr);
close(io);
(*entry)(args, bootdev, bootunit, bootpart, SYM_MAGIC, cp);
printf("exec: kernel returned!\n");
return;
shread:
printf("exec: short read\n");
errno = EIO;
closeout:
close(io);
return;
}
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