xref: /titanic_44/usr/src/lib/libc/amd64/fp/fpsetmask.c (revision cd3e933325e68e23516a196a8fea7f49b1e497c3)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1990, 1991 UNIX System Laboratories, Inc.	*/
28 /*	Copyright (c) 1988 AT&T	*/
29 /*	  All Rights Reserved	*/
30 
31 #pragma ident	"%Z%%M%	%I%	%E% SMI"
32 
33 #pragma weak _fpsetmask = fpsetmask
34 
35 extern void	_getmxcsr(int *), _putmxcsr(int);
36 
37 #include "lint.h"
38 #include <ieeefp.h>
39 #include "fp.h"
40 
41 fp_except
42 fpsetmask(fp_except newmask)
43 {
44 	struct _cw87 cw;
45 	fp_except oldmask;
46 	int	mxcsr;
47 
48 	_getcw(&cw);
49 	oldmask = (fp_except)(~cw.mask & EXCPMASK);
50 	cw.mask = ~((unsigned)newmask) & EXCPMASK;
51 	_putcw(cw);
52 	_getmxcsr(&mxcsr);
53 	mxcsr = (mxcsr & ~0x1f80) | (~((int)newmask << 7) & 0x1f80);
54 	_putmxcsr(mxcsr);
55 	return (oldmask);
56 }
57