1/*	$OpenBSD: fpsetsticky.c,v 1.1 2018/02/28 11:16:54 kettenis Exp $	*/
2/*
3 * Copyright (c) 2018 Mark Kettenis <kettenis@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include <ieeefp.h>
19#ifdef SOFTFLOAT_FOR_GCC
20#include "softfloat-for-gcc.h"
21#endif
22#include "milieu.h"
23#include <softfloat.h>
24
25#define FP_X_MASK	(FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL | FP_X_IMP)
26
27__weak_alias(_fpsetsticky,fpsetsticky);
28
29fp_except
30fpsetsticky(fp_except except)
31{
32	fp_except old, new;
33
34	__asm volatile("vmrs %0, fpscr" : "=r" (old));
35	new = old & ~(FP_X_MASK);
36	new |= (except & FP_X_MASK);
37	__asm volatile("vmsr fpscr, %0" :: "r" (new));
38
39	old |= float_exception_flags;
40	float_exception_flags = except;
41
42	return (old & FP_X_MASK);
43}
44