1/*-
2 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/lib/msun/arm/fenv.c,v 1.1 2004/06/06 10:03:59 das Exp $
27 */
28
29#include <fenv.h>
30
31#define FPSCR_ENABLE_SHIFT 8
32#define FPSCR_ENABLE_MASK  (FE_ALL_EXCEPT << FPSCR_ENABLE_SHIFT)
33
34#define FPSCR_RMODE_SHIFT 22
35
36const fenv_t __fe_dfl_env = 0;
37
38int fegetenv(fenv_t* __envp) {
39  fenv_t _fpscr;
40  __asm__ __volatile__("vmrs %0,fpscr" : "=r" (_fpscr));
41  *__envp = _fpscr;
42  return 0;
43}
44
45int fesetenv(const fenv_t* __envp) {
46  fenv_t _fpscr = *__envp;
47  __asm__ __volatile__("vmsr fpscr,%0" : :"ri" (_fpscr));
48  return 0;
49}
50
51int feclearexcept(int __excepts) {
52  fexcept_t __fpscr;
53  fegetenv(&__fpscr);
54  __fpscr &= ~__excepts;
55  fesetenv(&__fpscr);
56  return 0;
57}
58
59int fegetexceptflag(fexcept_t* __flagp, int __excepts) {
60  fexcept_t __fpscr;
61  fegetenv(&__fpscr);
62  *__flagp = __fpscr & __excepts;
63  return 0;
64}
65
66int fesetexceptflag(const fexcept_t* __flagp, int __excepts) {
67  fexcept_t __fpscr;
68  fegetenv(&__fpscr);
69  __fpscr &= ~__excepts;
70  __fpscr |= *__flagp & __excepts;
71  fesetenv(&__fpscr);
72  return 0;
73}
74
75int feraiseexcept(int __excepts) {
76  fexcept_t __ex = __excepts;
77  fesetexceptflag(&__ex, __excepts);
78  return 0;
79}
80
81int fetestexcept(int __excepts) {
82  fexcept_t __fpscr;
83  fegetenv(&__fpscr);
84  return (__fpscr & __excepts);
85}
86
87int fegetround(void) {
88  fenv_t _fpscr;
89  fegetenv(&_fpscr);
90  return ((_fpscr >> FPSCR_RMODE_SHIFT) & 0x3);
91}
92
93int fesetround(int __round) {
94  fenv_t _fpscr;
95  fegetenv(&_fpscr);
96  _fpscr &= ~(0x3 << FPSCR_RMODE_SHIFT);
97  _fpscr |= (__round << FPSCR_RMODE_SHIFT);
98  fesetenv(&_fpscr);
99  return 0;
100}
101
102int feholdexcept(fenv_t* __envp) {
103  fenv_t __env;
104  fegetenv(&__env);
105  *__envp = __env;
106  __env &= ~(FE_ALL_EXCEPT | FPSCR_ENABLE_MASK);
107  fesetenv(&__env);
108  return 0;
109}
110
111int feupdateenv(const fenv_t* __envp) {
112  fexcept_t __fpscr;
113  fegetenv(&__fpscr);
114  fesetenv(__envp);
115  feraiseexcept(__fpscr & FE_ALL_EXCEPT);
116  return 0;
117}
118
119int feenableexcept(int __mask) {
120  fenv_t __old_fpscr, __new_fpscr;
121  fegetenv(&__old_fpscr);
122  __new_fpscr = __old_fpscr | (__mask & FE_ALL_EXCEPT) << FPSCR_ENABLE_SHIFT;
123  fesetenv(&__new_fpscr);
124  return ((__old_fpscr >> FPSCR_ENABLE_SHIFT) & FE_ALL_EXCEPT);
125}
126
127int fedisableexcept(int __mask) {
128  fenv_t __old_fpscr, __new_fpscr;
129  fegetenv(&__old_fpscr);
130  __new_fpscr = __old_fpscr & ~((__mask & FE_ALL_EXCEPT) << FPSCR_ENABLE_SHIFT);
131  fesetenv(&__new_fpscr);
132  return ((__old_fpscr >> FPSCR_ENABLE_SHIFT) & FE_ALL_EXCEPT);
133}
134
135int fegetexcept(void) {
136  fenv_t __fpscr;
137  fegetenv(&__fpscr);
138  return ((__fpscr & FPSCR_ENABLE_MASK) >> FPSCR_ENABLE_SHIFT);
139}
140