master
1/* $NetBSD: fenv.h,v 1.6 2020/07/26 08:08:41 simonb Exp $ */
2
3/*-
4 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.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 * $FreeBSD: head/lib/msun/mips/fenv.h 226218 2011-10-10 15:43:09Z das $
29 */
30
31#ifndef _MIPS_FENV_H_
32#define _MIPS_FENV_H_
33
34#include <sys/stdint.h>
35
36/* Exception flags */
37#define FE_INEXACT 0x0004
38#define FE_UNDERFLOW 0x0008
39#define FE_OVERFLOW 0x0010
40#define FE_DIVBYZERO 0x0020
41#define FE_INVALID 0x0040
42#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
43 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
44
45/* Rounding modes */
46#define FE_TONEAREST 0x0000
47#define FE_TOWARDZERO 0x0001
48#define FE_UPWARD 0x0002
49#define FE_DOWNWARD 0x0003
50#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
51 FE_UPWARD | FE_TOWARDZERO)
52
53#ifndef __mips_soft_float
54
55#ifndef __fenv_static
56#define __fenv_static static
57#endif
58
59typedef uint32_t fpu_control_t __attribute__((__mode__(__SI__)));
60typedef fpu_control_t fenv_t;
61typedef fpu_control_t fexcept_t;
62
63__BEGIN_DECLS
64
65/* Default floating-point environment */
66extern const fenv_t __fe_dfl_env;
67#define FE_DFL_ENV (&__fe_dfl_env)
68
69/* We need to be able to map status flag positions to mask flag positions */
70#define _ENABLE_MASK (FE_ALL_EXCEPT << _ENABLE_SHIFT)
71#define _ENABLE_SHIFT 5
72
73static inline fpu_control_t
74__rfs(void)
75{
76 fpu_control_t __fpsr;
77
78 __asm __volatile("cfc1 %0,$31" : "=r" (__fpsr));
79 return __fpsr;
80}
81
82static inline void
83__wfs(fpu_control_t __fpsr)
84{
85
86 __asm __volatile("ctc1 %0,$31" : : "r" (__fpsr));
87}
88
89#if __GNUC_PREREQ__(8, 0)
90#pragma GCC diagnostic push
91#pragma GCC diagnostic ignored "-Wshadow"
92#endif
93
94__fenv_static inline int
95feclearexcept(int __excepts)
96{
97 fexcept_t __fpsr;
98
99 __excepts &= FE_ALL_EXCEPT;
100 __fpsr = __rfs();
101 __fpsr &= ~(__excepts | (__excepts << _ENABLE_SHIFT));
102 __wfs(__fpsr);
103 return 0;
104}
105
106__fenv_static inline int
107fegetexceptflag(fexcept_t *__flagp, int __excepts)
108{
109 fexcept_t __fpsr;
110
111 __fpsr = __rfs();
112 *__flagp = __fpsr & __excepts;
113 return (0);
114}
115
116__fenv_static inline int
117fesetexceptflag(const fexcept_t *__flagp, int __excepts)
118{
119 fexcept_t __fpsr;
120
121 __fpsr = __rfs();
122 __fpsr &= ~__excepts;
123 __fpsr |= *__flagp & __excepts;
124 __wfs(__fpsr);
125 return (0);
126}
127
128__fenv_static inline int
129feraiseexcept(int __excepts)
130{
131 fexcept_t __ex = __excepts;
132
133 fesetexceptflag(&__ex, __excepts); /* XXX */
134 return (0);
135}
136
137__fenv_static inline int
138fetestexcept(int __excepts)
139{
140 fexcept_t __fpsr;
141
142 __fpsr = __rfs();
143 return (__fpsr & __excepts);
144}
145
146__fenv_static inline int
147fegetround(void)
148{
149 fexcept_t __fpsr;
150
151 __fpsr = __rfs();
152 return __fpsr & _ROUND_MASK;
153}
154
155__fenv_static inline int
156fesetround(int __round)
157{
158 fexcept_t __fpsr;
159
160 if (__round & ~_ROUND_MASK)
161 return 1;
162 __fpsr = __rfs();
163 __fpsr &= ~_ROUND_MASK;
164 __fpsr |= __round;
165 __wfs(__fpsr);
166
167 return 0;
168}
169
170__fenv_static inline int
171fegetenv(fenv_t *__envp)
172{
173
174 *__envp = __rfs();
175 return (0);
176}
177
178__fenv_static inline int
179feholdexcept(fenv_t *__envp)
180{
181 fenv_t __env;
182
183 __env = __rfs();
184 *__envp = __env;
185 __env &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
186 __wfs(__env);
187 return (0);
188}
189
190__fenv_static inline int
191fesetenv(const fenv_t *__envp)
192{
193
194 __wfs(*__envp);
195 return (0);
196}
197
198__fenv_static inline int
199feupdateenv(const fenv_t *__envp)
200{
201 fexcept_t __fpsr;
202
203 __fpsr = __rfs();
204 __wfs(*__envp);
205 feraiseexcept(__fpsr & FE_ALL_EXCEPT);
206 return (0);
207}
208
209#if __GNUC_PREREQ__(8, 0)
210#pragma GCC diagnostic pop
211#endif
212
213#if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE)
214
215__fenv_static inline int
216feenableexcept(int __excepts)
217{
218 fenv_t __old_fpsr, __new_fpsr;
219
220 __new_fpsr = __rfs();
221 __old_fpsr = (__new_fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT;
222 __excepts &= FE_ALL_EXCEPT;
223 __new_fpsr |= __excepts << _ENABLE_SHIFT;
224 __wfs(__new_fpsr);
225 return __old_fpsr;
226}
227
228__fenv_static inline int
229fedisableexcept(int __excepts)
230{
231 fenv_t __old_fpsr, __new_fpsr;
232
233 __new_fpsr = __rfs();
234 __old_fpsr = (__new_fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT;
235 __excepts &= FE_ALL_EXCEPT;
236 __new_fpsr &= ~(__excepts << _ENABLE_SHIFT);
237 __wfs(__new_fpsr);
238 return __old_fpsr;
239}
240
241__fenv_static inline int
242fegetexcept(void)
243{
244 fenv_t __fpsr;
245
246 __fpsr = __rfs();
247 return ((__fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT);
248}
249
250#endif /* _NETBSD_SOURCE || _GNU_SOURCE */
251
252__END_DECLS
253
254#endif /* __mips_soft_float */
255
256#endif /* !_FENV_H_ */