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 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