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      1 /*
      2  * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
      3  *
      4  * This program is free software; you can redistribute it and/or modify it
      5  * under the terms of version 2 of the GNU General Public License as
      6  * published by the Free Software Foundation.
      7  *
      8  * This program is distributed in the hope that it would be useful, but
      9  * WITHOUT ANY WARRANTY; without even the implied warranty of
     10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
     11  *
     12  * Further, this software is distributed without any warranty that it is
     13  * free of the rightful claim of any third person regarding infringement
     14  * or the like.  Any license provided herein, whether implied or
     15  * otherwise, applies only to this software file.  Patent licenses, if
     16  * any, provided herein do not apply to combinations of this program with
     17  * other software, or any other product whatsoever.
     18  *
     19  * You should have received a copy of the GNU General Public License along
     20  * with this program; if not, write the Free Software Foundation, Inc.,
     21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
     22  *
     23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
     24  * Mountain View, CA  94043, or:
     25  *
     26  * http://www.sgi.com
     27  *
     28  * For further information regarding this notice, see:
     29  *
     30  * http://oss.sgi.com/projects/GenInfo/NoticeExplan/
     31  *
     32  */
     33 /* $Id: f00f.c,v 1.5 2008/04/24 06:36:14 subrata_modak Exp $ */
     34 /*
     35  * This is a simple test for handling of the pentium f00f bug.
     36  * It is an example of a catistrophic test case.  If the system
     37  * doesn't correctly handle this test, it will likely lockup.
     38  */
     39 #include <signal.h>
     40 #include <stdio.h>
     41 #include <stdlib.h>
     42 #include "test.h"
     43 
     44 char *TCID = "f00f";
     45 int TST_TOTAL = 1;
     46 
     47 #ifdef __i386__
     48 
     49 void sigill(int sig)
     50 {
     51 	tst_resm(TPASS, "SIGILL received from f00f instruction.  Good.");
     52 	tst_exit();
     53 }
     54 
     55 int main()
     56 {
     57 	signal(SIGILL, sigill);
     58 	tst_resm(TINFO, "Testing for proper f00f instruction handling.");
     59 
     60 	/*
     61 	 * an f00f instruction
     62 	 */
     63 	asm volatile (".byte	0xf0\n"
     64 		      ".byte	0x0f\n" ".byte	0xc7\n" ".byte	0xc8\n");
     65 
     66 	/*
     67 	 * we shouldn't get here, the f00f instruction should trigger
     68 	 * a SIGILL or lock the system.
     69 	 */
     70 	tst_brkm(TFAIL, NULL,
     71 		 "f00f instruction did not properly cause SIGILL");
     72 }
     73 
     74 #else /* __i386__ */
     75 
     76 int main()
     77 {
     78 	tst_brkm(TCONF, NULL, "f00f bug test only for i386");
     79 }
     80 
     81 #endif /* __i386__ */
     82