1 /* $NetBSD: sigstackalign.c,v 1.3 2008/04/28 20:23:05 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/types.h> 30 31 __RCSID("$NetBSD: sigstackalign.c,v 1.3 2008/04/28 20:23:05 martin Exp $"); 32 33 #include <signal.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 37 #define RANGE 16 38 #define STACKALIGN 8 39 #define BLOCKSIZE (MINSIGSTKSZ + RANGE) 40 41 extern void getstackptr(int); 42 43 void *stackptr; 44 45 int 46 main(int argc, char **argv) 47 { 48 char *stackblock; 49 int i, ret; 50 struct sigaction sa; 51 stack_t ss; 52 53 ret = 0; 54 55 sa.sa_handler = getstackptr; 56 sigemptyset(&sa.sa_mask); 57 sa.sa_flags = SA_ONSTACK; 58 if (sigaction(SIGUSR1, &sa, NULL) != 0) 59 err(1, "sigaction"); 60 61 stackblock = malloc(BLOCKSIZE); 62 for (i = 0; i < RANGE; i++) { 63 ss.ss_sp = stackblock; 64 ss.ss_size = MINSIGSTKSZ + i; 65 ss.ss_flags = 0; 66 if (sigaltstack(&ss, NULL) != 0) 67 err(1, "sigaltstack"); 68 kill(getpid(), SIGUSR1); 69 if ((u_int)stackptr % STACKALIGN != 0) { 70 fprintf(stderr, "Bad stack pointer %p\n", stackptr); 71 ret = 1; 72 } 73 #if 0 74 printf("i = %d, stackptr = %p\n", i, stackptr); 75 #endif 76 } 77 78 return ret; 79 } 80 81