NetBSD/sys/lib/libsa/exec.c

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/* $NetBSD: exec.c,v 1.17 1997/06/28 07:17:56 thorpej Exp $ */
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/*-
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#include <sys/param.h>
#include <sys/reboot.h>
#ifndef INSECURE
#include <sys/stat.h>
#endif
#include <sys/exec.h>
#ifdef _STANDALONE
#include <lib/libkern/libkern.h>
#else
#include <string.h>
#endif
#include "stand.h"
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void
exec(path, loadaddr, howto)
char *path;
char *loadaddr;
int howto;
{
#ifndef INSECURE
struct stat sb;
#endif
struct exec x;
int io, i;
char *addr, *ssym, *esym;
io = open(path, 0);
if (io < 0)
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return;
#ifndef INSECURE
(void) fstat(io, &sb);
if (sb.st_uid || (sb.st_mode & 2)) {
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printf("non-secure file, will not load\n");
close(io);
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errno = EPERM;
return;
}
#endif
i = read(io, (char *)&x, sizeof(x));
if (i != sizeof(x) || N_BADMAG(x)) {
errno = EFTYPE;
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return;
}
/* Text */
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printf("%ld", x.a_text);
addr = loadaddr;
if (N_GETMAGIC(x) == ZMAGIC) {
bcopy(&x, addr, sizeof(x));
addr += sizeof(x);
x.a_text -= sizeof(x);
}
if (read(io, (char *)addr, x.a_text) != x.a_text)
goto shread;
addr += x.a_text;
if (N_GETMAGIC(x) == ZMAGIC || N_GETMAGIC(x) == NMAGIC)
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while ((long)addr & (N_PAGSIZ(x) - 1))
*addr++ = 0;
/* Data */
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printf("+%ld", x.a_data);
if (read(io, addr, x.a_data) != x.a_data)
goto shread;
addr += x.a_data;
/* Bss */
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printf("+%ld", x.a_bss);
for (i = 0; i < x.a_bss; i++)
*addr++ = 0;
/* Symbols */
ssym = addr;
bcopy(&x.a_syms, addr, sizeof(x.a_syms));
addr += sizeof(x.a_syms);
if (x.a_syms) {
printf("+[%ld", x.a_syms);
if (read(io, addr, x.a_syms) != x.a_syms)
goto shread;
addr += x.a_syms;
}
i = 0;
if (x.a_syms && read(io, &i, sizeof(int)) != sizeof(int))
goto shread;
bcopy(&i, addr, sizeof(int));
if (i) {
i -= sizeof(int);
addr += sizeof(int);
if (read(io, addr, i) != i)
goto shread;
addr += i;
}
if (x.a_syms) {
/* and that many bytes of (debug symbols?) */
printf("+%d]", i);
}
close(io);
#define round_to_size(x) \
(((int)(x) + sizeof(int) - 1) & ~(sizeof(int) - 1))
esym = (char *)round_to_size(addr - loadaddr);
#undef round_to_size
/* and note the end address of all this */
printf(" total=0x%lx\n", (u_long)addr);
/*
* Machine-dependent code must now adjust the
* entry point. This used to be done here,
* but some systems may need to relocate the
* loaded file before jumping to it, and the
* displayed start address would be wrong.
*/
#ifdef EXEC_DEBUG
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printf("ssym=0x%x esym=0x%x\n", ssym, esym);
printf("\n\nReturn to boot...\n");
getchar();
#endif
machdep_start((char *)x.a_entry, howto, loadaddr, ssym, esym);
/* exec failed */
errno = ENOEXEC;
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return;
shread:
close(io);
errno = EIO;
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return;
}