1 /* $NetBSD: sigstackalign.c,v 1.4 2011/05/18 19:45:05 mellon 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 1.4 2011/05/18 19:45:05 mellon 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
43 extern void getstackptr(int);
44
45 void *stackptr;
46
47 int
main(int argc,char ** argv)48 main(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