1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2012 Ian Lepore <freebsd@damnhippie.dyndns.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <fenv.h>
33#include <float.h>
34
35#ifndef __ARM_PCS_VFP
36#include "softfloat-for-gcc.h"
37#include "milieu.h"
38#include "softfloat.h"
39#endif
40
41int
42__flt_rounds(void)
43{
44	int mode;
45
46#ifndef __ARM_PCS_VFP
47	/*
48	 * Translate our rounding modes to the unnamed
49	 * manifest constants required by C99 et. al.
50	 */
51	mode = __softfloat_float_rounding_mode;
52#else /* __ARM_PCS_VFP */
53	/*
54	 * Read the floating-point status and control register
55	 */
56	__asm __volatile("vmrs %0, fpscr" : "=&r"(mode));
57	mode &= _ROUND_MASK;
58#endif /* __ARM_PCS_VFP */
59
60	switch (mode) {
61	case FE_TOWARDZERO:
62		return (0);
63	case FE_TONEAREST:
64		return (1);
65	case FE_UPWARD:
66		return (2);
67	case FE_DOWNWARD:
68		return (3);
69	}
70	return (-1);
71}
72