regress/sys/arch/arm/sigstackalign/sigstackalign.c

   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  *
  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 1.2 2002/02/21 07:38:19 itojun Exp $");
  32
  33 #include <signal.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36
  37 #define RANGE 16
  38 #define STACKALIGN 8
  39 #define BLOCKSIZE (MINSIGSTKSZ + RANGE)
  40
  41 extern void getstackptr(int);
  42
  43 void *stackptr;
  44
  45 int
  46 main(int argc, char **argv)
  47 {
  48         char *stackblock;
  49         int i, ret;
  50         struct sigaction sa;
  51         stack_t ss;
  52
  53         ret = 0;
  54
  55         sa.sa_handler = getstackptr;
  56         sigemptyset(&sa.sa_mask);
  57         sa.sa_flags = SA_ONSTACK;
  58         if (sigaction(SIGUSR1, &sa, NULL) != 0)
  59                 err(1, "sigaction");
  60
  61         stackblock = malloc(BLOCKSIZE);
  62         for (i = 0; i < RANGE; i++) {
  63                 ss.ss_sp = stackblock;
  64                 ss.ss_size = MINSIGSTKSZ + i;
  65                 ss.ss_flags = 0;
  66                 if (sigaltstack(&ss, NULL) != 0)
  67                         err(1, "sigaltstack");
  68                 kill(getpid(), SIGUSR1);
  69                 if ((u_int)stackptr % STACKALIGN != 0) {
  70                         fprintf(stderr, "Bad stack pointer %p\n", stackptr);
  71                         ret = 1;
  72                 }
  73 #if 0
  74                 printf("i = %d, stackptr = %p\n", i, stackptr);
  75 #endif
  76         }
  77
  78         return ret;
  79 }
  80