1/*
2 * Copyright (c) 1996, 1997
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22#ifdef HAVE_CONFIG_H
23#include <config.h>
24#endif
25
26#include <stddef.h>
27
28#ifdef __osf__
29#include <stdio.h>
30#include <sys/sysinfo.h>
31#include <sys/proc.h>
32#endif /* __osf__ */
33
34#include "varattrs.h"
35#include "machdep.h"
36
37/*
38 * On platforms where the CPU doesn't support unaligned loads, force
39 * unaligned accesses to abort with SIGBUS, rather than being fixed
40 * up (slowly) by the OS kernel; on those platforms, misaligned accesses
41 * are bugs, and we want tcpdump to crash so that the bugs are reported.
42 *
43 * The only OS on which this is necessary is DEC OSF/1^W^WDigital
44 * UNIX^W^WTru64 UNIX.
45 */
46int
47abort_on_misalignment(char *ebuf _U_, size_t ebufsiz _U_)
48{
49#ifdef __osf__
50	static int buf[2] = { SSIN_UACPROC, UAC_SIGBUS };
51
52	if (setsysinfo(SSI_NVPAIRS, (caddr_t)buf, 1, 0, 0) < 0) {
53		(void)snprintf(ebuf, ebufsiz, "setsysinfo: errno %d", errno);
54		return (-1);
55	}
56#endif
57	return (0);
58}
59