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 <sys/cdefs.h> 23 #ifndef lint 24 __RCSID("$NetBSD: machdep.c,v 1.8 2023/08/17 20:19:40 christos Exp $"); 25 #endif 26 27 #ifdef HAVE_CONFIG_H 28 #include <config.h> 29 #endif 30 31 #include <stddef.h> 32 33 #ifdef __osf__ 34 #include <stdio.h> 35 #include <sys/sysinfo.h> 36 #include <sys/proc.h> 37 #endif /* __osf__ */ 38 39 #include "varattrs.h" 40 #include "machdep.h" 41 42 /* 43 * On platforms where the CPU doesn't support unaligned loads, force 44 * unaligned accesses to abort with SIGBUS, rather than being fixed 45 * up (slowly) by the OS kernel; on those platforms, misaligned accesses 46 * are bugs, and we want tcpdump to crash so that the bugs are reported. 47 * 48 * The only OS on which this is necessary is DEC OSF/1^W^WDigital 49 * UNIX^W^WTru64 UNIX. 50 */ 51 int 52 abort_on_misalignment(char *ebuf _U_, size_t ebufsiz _U_) 53 { 54 #ifdef __osf__ 55 static int buf[2] = { SSIN_UACPROC, UAC_SIGBUS }; 56 57 if (setsysinfo(SSI_NVPAIRS, (caddr_t)buf, 1, 0, 0) < 0) { 58 (void)snprintf(ebuf, ebufsiz, "setsysinfo: errno %d", errno); 59 return (-1); 60 } 61 #endif 62 return (0); 63 } 64