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#include <err.h> 37#include <unistd.h> 38 39#define RANGE 16 40#define STACKALIGN 8 41#define BLOCKSIZE (MINSIGSTKSZ + RANGE) 42 43extern void getstackptr(int); 44 45void *stackptr; 46 47int 48main(int argc, char **argv) 49{ 50 char *stackblock; 51 int i, ret; 52 struct sigaction sa; 53 stack_t ss; 54 55 ret = 0; 56 57 sa.sa_handler = getstackptr; 58 sigemptyset(&sa.sa_mask); 59 sa.sa_flags = SA_ONSTACK; 60 if (sigaction(SIGUSR1, &sa, NULL) != 0) 61 err(1, "sigaction"); 62 63 stackblock = malloc(BLOCKSIZE); 64 for (i = 0; i < RANGE; i++) { 65 ss.ss_sp = stackblock; 66 ss.ss_size = MINSIGSTKSZ + i; 67 ss.ss_flags = 0; 68 if (sigaltstack(&ss, NULL) != 0) 69 err(1, "sigaltstack"); 70 kill(getpid(), SIGUSR1); 71 if ((u_int)stackptr % STACKALIGN != 0) { 72 fprintf(stderr, "Bad stack pointer %p\n", stackptr); 73 ret = 1; 74 } 75#if 0 76 printf("i = %d, stackptr = %p\n", i, stackptr); 77#endif 78 } 79 80 return ret; 81} 82 83