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