1/*-
2 * Copyright (c) 2004-2005 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
27#ifdef __arm__
28#include <arm/fenv.h>
29#else /* __arm__ */
30
31#ifndef _FENV_H_
32#define _FENV_H_
33
34#include <sys/cdefs.h>
35#include <sys/_types.h>
36
37#ifndef __fenv_static
38#define __fenv_static static
39#endif
40
41/* The high 32 bits contain fpcr, low 32 contain fpsr. */
42typedef __uint64_t fenv_t;
43typedef __uint64_t fexcept_t;
44
45/* Exception flags */
46#define FE_INVALID 0x00000001
47#define FE_DIVBYZERO 0x00000002
48#define FE_OVERFLOW 0x00000004
49#define FE_UNDERFLOW 0x00000008
50#define FE_INEXACT 0x00000010
51#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
52 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
53
54/*
55 * Rounding modes
56 *
57 * We can't just use the hardware bit values here, because that would
58 * make FE_UPWARD and FE_DOWNWARD negative, which is not allowed.
59 */
60#define FE_TONEAREST 0x0
61#define FE_UPWARD 0x1
62#define FE_DOWNWARD 0x2
63#define FE_TOWARDZERO 0x3
64#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
65 FE_UPWARD | FE_TOWARDZERO)
66#define _ROUND_SHIFT 22
67
68__BEGIN_DECLS
69
70/* Default floating-point environment */
71extern const fenv_t __fe_dfl_env;
72#define FE_DFL_ENV (&__fe_dfl_env)
73
74/* We need to be able to map status flag positions to mask flag positions */
75#define _FPUSW_SHIFT 8
76#define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT)
77
78#define __mrs_fpcr(__r) __asm __volatile("mrs %0, fpcr" : "=r" (__r))
79#define __msr_fpcr(__r) __asm __volatile("msr fpcr, %0" : : "r" (__r))
80
81#define __mrs_fpsr(__r) __asm __volatile("mrs %0, fpsr" : "=r" (__r))
82#define __msr_fpsr(__r) __asm __volatile("msr fpsr, %0" : : "r" (__r))
83
84__fenv_static __inline int
85feclearexcept(int __excepts)
86{
87 fexcept_t __r;
88
89 __mrs_fpsr(__r);
90 __r &= ~__excepts;
91 __msr_fpsr(__r);
92 return (0);
93}
94
95__fenv_static inline int
96fegetexceptflag(fexcept_t *__flagp, int __excepts)
97{
98 fexcept_t __r;
99
100 __mrs_fpsr(__r);
101 *__flagp = __r & __excepts;
102 return (0);
103}
104
105__fenv_static inline int
106fesetexceptflag(const fexcept_t *__flagp, int __excepts)
107{
108 fexcept_t __r;
109
110 __mrs_fpsr(__r);
111 __r &= ~__excepts;
112 __r |= *__flagp & __excepts;
113 __msr_fpsr(__r);
114 return (0);
115}
116
117__fenv_static inline int
118feraiseexcept(int __excepts)
119{
120 fexcept_t __r;
121
122 __mrs_fpsr(__r);
123 __r |= __excepts;
124 __msr_fpsr(__r);
125 return (0);
126}
127
128__fenv_static inline int
129fetestexcept(int __excepts)
130{
131 fexcept_t __r;
132
133 __mrs_fpsr(__r);
134 return (__r & __excepts);
135}
136
137__fenv_static inline int
138fegetround(void)
139{
140 fenv_t __r;
141
142 __mrs_fpcr(__r);
143 return ((__r >> _ROUND_SHIFT) & _ROUND_MASK);
144}
145
146__fenv_static inline int
147fesetround(int __round)
148{
149 fenv_t __r;
150
151 if (__round & ~_ROUND_MASK)
152 return (-1);
153 __mrs_fpcr(__r);
154 __r &= ~(_ROUND_MASK << _ROUND_SHIFT);
155 __r |= __round << _ROUND_SHIFT;
156 __msr_fpcr(__r);
157 return (0);
158}
159
160__fenv_static inline int
161fegetenv(fenv_t *__envp)
162{
163 __uint64_t fpcr;
164 __uint64_t fpsr;
165
166 __mrs_fpcr(fpcr);
167 __mrs_fpsr(fpsr);
168 *__envp = fpsr | (fpcr << 32);
169
170 return (0);
171}
172
173__fenv_static inline int
174feholdexcept(fenv_t *__envp)
175{
176 fenv_t __r;
177
178 __mrs_fpcr(__r);
179 *__envp = __r << 32;
180 __r &= ~(_ENABLE_MASK);
181 __msr_fpcr(__r);
182
183 __mrs_fpsr(__r);
184 *__envp |= (__uint32_t)__r;
185 __r &= ~(_ENABLE_MASK);
186 __msr_fpsr(__r);
187 return (0);
188}
189
190__fenv_static inline int
191fesetenv(const fenv_t *__envp)
192{
193
194 __msr_fpcr((*__envp) >> 32);
195 __msr_fpsr((fenv_t)(__uint32_t)*__envp);
196 return (0);
197}
198
199__fenv_static inline int
200feupdateenv(const fenv_t *__envp)
201{
202 fexcept_t __r;
203
204 __mrs_fpsr(__r);
205 fesetenv(__envp);
206 feraiseexcept(__r & FE_ALL_EXCEPT);
207 return (0);
208}
209
210#if __BSD_VISIBLE
211
212/* We currently provide no external definitions of the functions below. */
213
214static inline int
215feenableexcept(int __mask)
216{
217 fenv_t __old_r, __new_r;
218
219 __mrs_fpcr(__old_r);
220 __new_r = __old_r | ((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
221 __msr_fpcr(__new_r);
222 return ((__old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
223}
224
225static inline int
226fedisableexcept(int __mask)
227{
228 fenv_t __old_r, __new_r;
229
230 __mrs_fpcr(__old_r);
231 __new_r = __old_r & ~((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
232 __msr_fpcr(__new_r);
233 return ((__old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
234}
235
236static inline int
237fegetexcept(void)
238{
239 fenv_t __r;
240
241 __mrs_fpcr(__r);
242 return ((__r & _ENABLE_MASK) >> _FPUSW_SHIFT);
243}
244
245#endif /* __BSD_VISIBLE */
246
247__END_DECLS
248
249#endif /* !_FENV_H_ */
250
251#endif /* __arm__ */