1/*	$NetBSD: fpsetmask.c,v 1.5 2009/01/25 16:44:41 skrll Exp $	*/
2
3/*	$OpenBSD: fpsetmask.c,v 1.4 2004/01/05 06:06:16 otto Exp $	*/
4
5/*
6 * Written by Miodrag Vallat.  Public domain
7 */
8
9#include <sys/cdefs.h>
10#if defined(LIBC_SCCS) && !defined(lint)
11__RCSID("$NetBSD: fpsetmask.c,v 1.5 2009/01/25 16:44:41 skrll Exp $");
12#endif /* LIBC_SCCS and not lint */
13
14#include <sys/types.h>
15#include <ieeefp.h>
16
17fp_except
18fpsetmask(fp_except mask)
19{
20	uint64_t fpsr;
21	fp_except old;
22
23	__asm volatile("fstd %%fr0,0(%1)" : "=m"(fpsr) : "r"(&fpsr) : "memory");
24	old = (fp_except)(fpsr >> 32) & 0x1f;
25	fpsr = (fpsr & 0xffffffe000000000LL) | ((uint64_t)(mask & 0x1f) << 32);
26	__asm volatile("fldd 0(%0),%%fr0" : : "r"(&fpsr) : "memory");
27	return (old);
28}
29