1/*	$NetBSD: fpgetround.c,v 1.5 2012/06/24 15:26:02 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas of 3am Software Foundry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef __VFP_FP__
33#error FPA is not supported anymore
34#endif
35
36#include <sys/cdefs.h>
37#if defined(LIBC_SCCS) && !defined(lint)
38__RCSID("$NetBSD: fpgetround.c,v 1.5 2012/06/24 15:26:02 christos Exp $");
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42
43#include <sys/types.h>
44#include <ieeefp.h>
45
46#include <arm/vfpreg.h>
47
48#ifdef __weak_alias
49__weak_alias(fpgetround,_fpgetround)
50#endif
51
52/*
53 * Return the current FP rounding mode
54 */
55
56fp_rnd
57fpgetround(void)
58{
59	__CTASSERT(__SHIFTOUT(VFP_FPSCR_RN, VFP_FPSCR_RMODE) == FP_RN);
60	__CTASSERT(__SHIFTOUT(VFP_FPSCR_RP, VFP_FPSCR_RMODE) == FP_RP);
61	__CTASSERT(__SHIFTOUT(VFP_FPSCR_RM, VFP_FPSCR_RMODE) == FP_RM);
62	__CTASSERT(__SHIFTOUT(VFP_FPSCR_RZ, VFP_FPSCR_RMODE) == FP_RZ);
63	uint32_t fpscr;
64	__asm __volatile("vmrs %0, fpscr" : "=r" (fpscr));
65	return __SHIFTOUT(fpscr, VFP_FPSCR_RMODE);
66}
67