2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
32 #include <sys/_types.h>
35 #define __fenv_static static
38 typedef __uint32_t fenv_t;
39 typedef __uint32_t fexcept_t;
42 #define FE_INVALID 0x0001
43 #define FE_DIVBYZERO 0x0002
44 #define FE_OVERFLOW 0x0004
45 #define FE_UNDERFLOW 0x0008
46 #define FE_INEXACT 0x0010
48 #define FE_DENORMAL 0x0080
49 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
50 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW | FE_DENORMAL)
52 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
53 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
57 #define VFP_FE_TONEAREST 0x00000000
58 #define VFP_FE_UPWARD 0x00400000
59 #define VFP_FE_DOWNWARD 0x00800000
60 #define VFP_FE_TOWARDZERO 0x00c00000
63 #define FE_TONEAREST VFP_FE_TONEAREST
64 #define FE_UPWARD VFP_FE_UPWARD
65 #define FE_DOWNWARD VFP_FE_DOWNWARD
66 #define FE_TOWARDZERO VFP_FE_TOWARDZERO
68 #define FE_TONEAREST 0x0000
69 #define FE_TOWARDZERO 0x0001
70 #define FE_UPWARD 0x0002
71 #define FE_DOWNWARD 0x0003
73 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
74 FE_UPWARD | FE_TOWARDZERO)
77 /* Default floating-point environment */
78 extern const fenv_t __fe_dfl_env;
79 #define FE_DFL_ENV (&__fe_dfl_env)
81 /* We need to be able to map status flag positions to mask flag positions */
83 #define _FPUSW_SHIFT 16
84 #define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT)
89 int feclearexcept(int __excepts);
90 int fegetexceptflag(fexcept_t *__flagp, int __excepts);
91 int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
92 int feraiseexcept(int __excepts);
93 int fetestexcept(int __excepts);
95 int fesetround(int __round);
96 int fegetenv(fenv_t *__envp);
97 int feholdexcept(fenv_t *__envp);
98 int fesetenv(const fenv_t *__envp);
99 int feupdateenv(const fenv_t *__envp);
101 int feenableexcept(int __mask);
102 int fedisableexcept(int __mask);
103 int fegetexcept(void);
106 #else /* __ARM_PCS_VFP */
108 #define vmrs_fpscr(__r) __asm __volatile("vmrs %0, fpscr" : "=&r"(__r))
109 #define vmsr_fpscr(__r) __asm __volatile("vmsr fpscr, %0" : : "r"(__r))
111 #define _FPU_MASK_SHIFT 8
113 __fenv_static inline int
114 feclearexcept(int __excepts)
119 __fpsr &= ~__excepts;
124 __fenv_static inline int
125 fegetexceptflag(fexcept_t *__flagp, int __excepts)
130 *__flagp = __fpsr & __excepts;
134 __fenv_static inline int
135 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
140 __fpsr &= ~__excepts;
141 __fpsr |= *__flagp & __excepts;
146 __fenv_static inline int
147 feraiseexcept(int __excepts)
149 fexcept_t __ex = __excepts;
151 fesetexceptflag(&__ex, __excepts); /* XXX */
155 __fenv_static inline int
156 fetestexcept(int __excepts)
161 return (__fpsr & __excepts);
164 __fenv_static inline int
170 return (__fpsr & _ROUND_MASK);
173 __fenv_static inline int
174 fesetround(int __round)
179 __fpsr &= ~(_ROUND_MASK);
185 __fenv_static inline int
186 fegetenv(fenv_t *__envp)
193 __fenv_static inline int
194 feholdexcept(fenv_t *__envp)
200 __env &= ~(FE_ALL_EXCEPT);
205 __fenv_static inline int
206 fesetenv(const fenv_t *__envp)
213 __fenv_static inline int
214 feupdateenv(const fenv_t *__envp)
220 feraiseexcept(__fpsr & FE_ALL_EXCEPT);
226 /* We currently provide no external definitions of the functions below. */
228 __fenv_static inline int
229 feenableexcept(int __mask)
231 fenv_t __old_fpsr, __new_fpsr;
233 vmrs_fpscr(__old_fpsr);
234 __new_fpsr = __old_fpsr |
235 ((__mask & FE_ALL_EXCEPT) << _FPU_MASK_SHIFT);
236 vmsr_fpscr(__new_fpsr);
237 return ((__old_fpsr >> _FPU_MASK_SHIFT) & FE_ALL_EXCEPT);
240 __fenv_static inline int
241 fedisableexcept(int __mask)
243 fenv_t __old_fpsr, __new_fpsr;
245 vmrs_fpscr(__old_fpsr);
246 __new_fpsr = __old_fpsr &
247 ~((__mask & FE_ALL_EXCEPT) << _FPU_MASK_SHIFT);
248 vmsr_fpscr(__new_fpsr);
249 return ((__old_fpsr >> _FPU_MASK_SHIFT) & FE_ALL_EXCEPT);
252 __fenv_static inline int
258 return (__fpsr & FE_ALL_EXCEPT);
261 #endif /* __BSD_VISIBLE */
263 #endif /* __ARM_PCS_VFP */
267 #endif /* !_FENV_H_ */