1*06474731Smellon /* $NetBSD: sigstackalign.c,v 1.4 2011/05/18 19:45:05 mellon Exp $ */
20dd5877aSitojun
30dd5877aSitojun /*-
40dd5877aSitojun * Copyright (c) 2001 The NetBSD Foundation, Inc.
50dd5877aSitojun * All rights reserved.
60dd5877aSitojun *
70dd5877aSitojun * Redistribution and use in source and binary forms, with or without
80dd5877aSitojun * modification, are permitted provided that the following conditions
90dd5877aSitojun * are met:
100dd5877aSitojun * 1. Redistributions of source code must retain the above copyright
110dd5877aSitojun * notice, this list of conditions and the following disclaimer.
120dd5877aSitojun * 2. Redistributions in binary form must reproduce the above copyright
130dd5877aSitojun * notice, this list of conditions and the following disclaimer in the
140dd5877aSitojun * documentation and/or other materials provided with the distribution.
150dd5877aSitojun *
160dd5877aSitojun * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
170dd5877aSitojun * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
180dd5877aSitojun * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
190dd5877aSitojun * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
200dd5877aSitojun * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
210dd5877aSitojun * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
220dd5877aSitojun * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
230dd5877aSitojun * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
240dd5877aSitojun * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
250dd5877aSitojun * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
260dd5877aSitojun * POSSIBILITY OF SUCH DAMAGE.
270dd5877aSitojun */
283b01aba7Sbjh21
293b01aba7Sbjh21 #include <sys/types.h>
303b01aba7Sbjh21
31*06474731Smellon __RCSID("$NetBSD: sigstackalign.c,v 1.4 2011/05/18 19:45:05 mellon Exp $");
323b01aba7Sbjh21
333b01aba7Sbjh21 #include <signal.h>
343b01aba7Sbjh21 #include <stdio.h>
353b01aba7Sbjh21 #include <stdlib.h>
36*06474731Smellon #include <err.h>
37*06474731Smellon #include <unistd.h>
383b01aba7Sbjh21
393b01aba7Sbjh21 #define RANGE 16
403b01aba7Sbjh21 #define STACKALIGN 8
413b01aba7Sbjh21 #define BLOCKSIZE (MINSIGSTKSZ + RANGE)
423b01aba7Sbjh21
433b01aba7Sbjh21 extern void getstackptr(int);
443b01aba7Sbjh21
453b01aba7Sbjh21 void *stackptr;
463b01aba7Sbjh21
473b01aba7Sbjh21 int
main(int argc,char ** argv)483b01aba7Sbjh21 main(int argc, char **argv)
493b01aba7Sbjh21 {
503b01aba7Sbjh21 char *stackblock;
513b01aba7Sbjh21 int i, ret;
523b01aba7Sbjh21 struct sigaction sa;
533b01aba7Sbjh21 stack_t ss;
543b01aba7Sbjh21
553b01aba7Sbjh21 ret = 0;
563b01aba7Sbjh21
573b01aba7Sbjh21 sa.sa_handler = getstackptr;
583b01aba7Sbjh21 sigemptyset(&sa.sa_mask);
593b01aba7Sbjh21 sa.sa_flags = SA_ONSTACK;
603b01aba7Sbjh21 if (sigaction(SIGUSR1, &sa, NULL) != 0)
613b01aba7Sbjh21 err(1, "sigaction");
623b01aba7Sbjh21
633b01aba7Sbjh21 stackblock = malloc(BLOCKSIZE);
643b01aba7Sbjh21 for (i = 0; i < RANGE; i++) {
653b01aba7Sbjh21 ss.ss_sp = stackblock;
663b01aba7Sbjh21 ss.ss_size = MINSIGSTKSZ + i;
673b01aba7Sbjh21 ss.ss_flags = 0;
683b01aba7Sbjh21 if (sigaltstack(&ss, NULL) != 0)
693b01aba7Sbjh21 err(1, "sigaltstack");
703b01aba7Sbjh21 kill(getpid(), SIGUSR1);
713b01aba7Sbjh21 if ((u_int)stackptr % STACKALIGN != 0) {
723b01aba7Sbjh21 fprintf(stderr, "Bad stack pointer %p\n", stackptr);
733b01aba7Sbjh21 ret = 1;
743b01aba7Sbjh21 }
753b01aba7Sbjh21 #if 0
763b01aba7Sbjh21 printf("i = %d, stackptr = %p\n", i, stackptr);
773b01aba7Sbjh21 #endif
783b01aba7Sbjh21 }
793b01aba7Sbjh21
803b01aba7Sbjh21 return ret;
813b01aba7Sbjh21 }
823b01aba7Sbjh21
83