fpsetmask.c revision 1.6 
11.6Schristos/*	$NetBSD: fpsetmask.c,v 1.6 2012/03/21 00:38:34 christos Exp $	*/
21.2Sperry
31.1Sjtc/*
41.1Sjtc * Written by J.T. Conklin, Apr 10, 1995
51.1Sjtc * Public domain.
61.1Sjtc */
71.1Sjtc
81.3Sthorpej#include <sys/cdefs.h>
91.4Slukem#if defined(LIBC_SCCS) && !defined(lint)
101.6Schristos__RCSID("$NetBSD: fpsetmask.c,v 1.6 2012/03/21 00:38:34 christos Exp $");
111.4Slukem#endif /* LIBC_SCCS and not lint */
121.3Sthorpej
131.3Sthorpej#include "namespace.h"
141.3Sthorpej
151.1Sjtc#include <ieeefp.h>
161.3Sthorpej
171.3Sthorpej#ifdef __weak_alias
181.3Sthorpej__weak_alias(fpsetmask,_fpsetmask)
191.3Sthorpej#endif
201.1Sjtc
211.1Sjtcfp_except
221.6Schristosfpsetmask(fp_except mask)
231.1Sjtc{
241.1Sjtc	fp_except old;
251.1Sjtc	fp_except new;
261.1Sjtc
271.5Sperry	__asm("st %%fsr,%0" : "=m" (*&old));
281.1Sjtc
291.1Sjtc	new = old;
301.1Sjtc	new &= ~(0x1f << 23);
311.1Sjtc	new |= ((mask & 0x1f) << 23);
321.1Sjtc
331.5Sperry	__asm("ld %0,%%fsr" : : "m" (*&new));
341.1Sjtc
351.1Sjtc	return (old >> 23) & 0x1f;
361.1Sjtc}
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