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 #include <config.h>
23
24 #include <stddef.h>
25
26 #ifdef __osf__
27 #include <stdio.h>
28 #include <sys/sysinfo.h>
29 #include <sys/proc.h>
30 #endif /* __osf__ */
31
32 #include "varattrs.h"
33 #include "machdep.h"
34
35 /*
36 * On platforms where the CPU doesn't support unaligned loads, force
37 * unaligned accesses to abort with SIGBUS, rather than being fixed
38 * up (slowly) by the OS kernel; on those platforms, misaligned accesses
39 * are bugs, and we want tcpdump to crash so that the bugs are reported.
40 *
41 * The only OS on which this is necessary is DEC OSF/1^W^WDigital
42 * UNIX^W^WTru64 UNIX.
43 */
44 int
abort_on_misalignment(char * ebuf _U_,size_t ebufsiz _U_)45 abort_on_misalignment(char *ebuf _U_, size_t ebufsiz _U_)
46 {
47 #ifdef __osf__
48 static int buf[2] = { SSIN_UACPROC, UAC_SIGBUS };
49
50 if (setsysinfo(SSI_NVPAIRS, (caddr_t)buf, 1, 0, 0) < 0) {
51 (void)snprintf(ebuf, ebufsiz, "setsysinfo: errno %d", errno);
52 return (-1);
53 }
54 #endif
55 return (0);
56 }
57