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fpgetsticky.c revision 1.1.12.1 
      1  1.1.12.1  perry /*	$NetBSD: fpgetsticky.c,v 1.1.12.1 1999/04/30 15:07:07 perry Exp $	*/
      2       1.1    cgd 
      3       1.1    cgd /*
      4       1.1    cgd  * Copyright (c) 1995 Christopher G. Demetriou
      5       1.1    cgd  * All rights reserved.
      6       1.1    cgd  *
      7       1.1    cgd  * Redistribution and use in source and binary forms, with or without
      8       1.1    cgd  * modification, are permitted provided that the following conditions
      9       1.1    cgd  * are met:
     10       1.1    cgd  * 1. Redistributions of source code must retain the above copyright
     11       1.1    cgd  *    notice, this list of conditions and the following disclaimer.
     12       1.1    cgd  * 2. Redistributions in binary form must reproduce the above copyright
     13       1.1    cgd  *    notice, this list of conditions and the following disclaimer in the
     14       1.1    cgd  *    documentation and/or other materials provided with the distribution.
     15       1.1    cgd  * 3. All advertising materials mentioning features or use of this software
     16       1.1    cgd  *    must display the following acknowledgement:
     17       1.1    cgd  *      This product includes software developed by Christopher G. Demetriou
     18       1.1    cgd  *	for the NetBSD Project.
     19       1.1    cgd  * 4. The name of the author may not be used to endorse or promote products
     20       1.1    cgd  *    derived from this software without specific prior written permission
     21       1.1    cgd  *
     22       1.1    cgd  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23       1.1    cgd  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24       1.1    cgd  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25       1.1    cgd  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26       1.1    cgd  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27       1.1    cgd  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28       1.1    cgd  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29       1.1    cgd  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30       1.1    cgd  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31       1.1    cgd  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32       1.1    cgd  */
     33       1.1    cgd 
     34  1.1.12.1  perry #include <sys/types.h>
     35       1.1    cgd #include <ieeefp.h>
     36       1.1    cgd 
     37       1.1    cgd fp_except
     38  1.1.12.1  perry fpgetsticky __P((void))
     39       1.1    cgd {
     40  1.1.12.1  perry 	double fpcrval;
     41  1.1.12.1  perry 	u_int64_t old;
     42       1.1    cgd 
     43  1.1.12.1  perry 	__asm__("trapb");
     44  1.1.12.1  perry 	__asm__("mf_fpcr %0" : "=f" (fpcrval));
     45  1.1.12.1  perry 	__asm__("trapb");
     46  1.1.12.1  perry 	old = *(u_int64_t *)&fpcrval;
     47  1.1.12.1  perry 
     48  1.1.12.1  perry 	return (old >> 52) & 0x3f;
     49       1.1    cgd }
     50