1 /* $NetBSD: sigstackalign.c,v 1.2 2002/02/21 07:38:19 itojun 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/types.h> 37 38 __RCSID("$NetBSD: sigstackalign.c,v 1.2 2002/02/21 07:38:19 itojun Exp $"); 39 40 #include <signal.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 44 #define RANGE 16 45 #define STACKALIGN 8 46 #define BLOCKSIZE (MINSIGSTKSZ + RANGE) 47 48 extern void getstackptr(int); 49 50 void *stackptr; 51 52 int 53 main(int argc, char **argv) 54 { 55 char *stackblock; 56 int i, ret; 57 struct sigaction sa; 58 stack_t ss; 59 60 ret = 0; 61 62 sa.sa_handler = getstackptr; 63 sigemptyset(&sa.sa_mask); 64 sa.sa_flags = SA_ONSTACK; 65 if (sigaction(SIGUSR1, &sa, NULL) != 0) 66 err(1, "sigaction"); 67 68 stackblock = malloc(BLOCKSIZE); 69 for (i = 0; i < RANGE; i++) { 70 ss.ss_sp = stackblock; 71 ss.ss_size = MINSIGSTKSZ + i; 72 ss.ss_flags = 0; 73 if (sigaltstack(&ss, NULL) != 0) 74 err(1, "sigaltstack"); 75 kill(getpid(), SIGUSR1); 76 if ((u_int)stackptr % STACKALIGN != 0) { 77 fprintf(stderr, "Bad stack pointer %p\n", stackptr); 78 ret = 1; 79 } 80 #if 0 81 printf("i = %d, stackptr = %p\n", i, stackptr); 82 #endif 83 } 84 85 return ret; 86 } 87 88