fpsetmask.c revision 1.5 
1/*	$NetBSD: fpsetmask.c,v 1.5 2005/12/24 23:10:08 perry Exp $	*/
2
3/*
4 * Written by J.T. Conklin, Apr 10, 1995
5 * Public domain.
6 */
7
8#include <sys/cdefs.h>
9#if defined(LIBC_SCCS) && !defined(lint)
10__RCSID("$NetBSD: fpsetmask.c,v 1.5 2005/12/24 23:10:08 perry Exp $");
11#endif /* LIBC_SCCS and not lint */
12
13#include "namespace.h"
14
15#include <ieeefp.h>
16
17#ifdef __weak_alias
18__weak_alias(fpsetmask,_fpsetmask)
19#endif
20
21fp_except
22fpsetmask(mask)
23	fp_except mask;
24{
25	fp_except old;
26	fp_except new;
27
28	__asm("st %%fsr,%0" : "=m" (*&old));
29
30	new = old;
31	new &= ~(0x1f << 23);
32	new |= ((mask & 0x1f) << 23);
33
34	__asm("ld %0,%%fsr" : : "m" (*&new));
35
36	return (old >> 23) & 0x1f;
37}
38