2 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
34 #include <sys/_types.h>
37 #define __fenv_static static
40 /* The high 32 bits contain fpcr, low 32 contain fpsr. */
41 typedef __uint64_t fenv_t;
42 typedef __uint64_t fexcept_t;
45 #define FE_INVALID 0x00000001
46 #define FE_DIVBYZERO 0x00000002
47 #define FE_OVERFLOW 0x00000004
48 #define FE_UNDERFLOW 0x00000008
49 #define FE_INEXACT 0x00000010
50 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
51 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
56 * We can't just use the hardware bit values here, because that would
57 * make FE_UPWARD and FE_DOWNWARD negative, which is not allowed.
59 #define FE_TONEAREST 0x0
61 #define FE_DOWNWARD 0x2
62 #define FE_TOWARDZERO 0x3
63 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
64 FE_UPWARD | FE_TOWARDZERO)
65 #define _ROUND_SHIFT 22
69 /* Default floating-point environment */
70 extern const fenv_t __fe_dfl_env;
71 #define FE_DFL_ENV (&__fe_dfl_env)
73 /* We need to be able to map status flag positions to mask flag positions */
74 #define _FPUSW_SHIFT 8
75 #define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT)
77 #define __mrs_fpcr(__r) __asm __volatile("mrs %0, fpcr" : "=r" (__r))
78 #define __msr_fpcr(__r) __asm __volatile("msr fpcr, %0" : : "r" (__r))
80 #define __mrs_fpsr(__r) __asm __volatile("mrs %0, fpsr" : "=r" (__r))
81 #define __msr_fpsr(__r) __asm __volatile("msr fpsr, %0" : : "r" (__r))
83 __fenv_static __inline int
84 feclearexcept(int __excepts)
94 __fenv_static inline int
95 fegetexceptflag(fexcept_t *__flagp, int __excepts)
100 *__flagp = __r & __excepts;
104 __fenv_static inline int
105 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
111 __r |= *__flagp & __excepts;
116 __fenv_static inline int
117 feraiseexcept(int __excepts)
127 __fenv_static inline int
128 fetestexcept(int __excepts)
133 return (__r & __excepts);
136 __fenv_static inline int
142 return ((__r >> _ROUND_SHIFT) & _ROUND_MASK);
145 __fenv_static inline int
146 fesetround(int __round)
150 if (__round & ~_ROUND_MASK)
153 __r &= ~(_ROUND_MASK << _ROUND_SHIFT);
154 __r |= __round << _ROUND_SHIFT;
159 __fenv_static inline int
160 fegetenv(fenv_t *__envp)
167 *__envp = fpsr | (fpcr << 32);
172 __fenv_static inline int
173 feholdexcept(fenv_t *__envp)
179 __r &= ~(_ENABLE_MASK);
183 *__envp |= (__uint32_t)__r;
184 __r &= ~(_ENABLE_MASK);
189 __fenv_static inline int
190 fesetenv(const fenv_t *__envp)
193 __msr_fpcr((*__envp) >> 32);
194 __msr_fpsr((fenv_t)(__uint32_t)*__envp);
198 __fenv_static inline int
199 feupdateenv(const fenv_t *__envp)
205 feraiseexcept(__r & FE_ALL_EXCEPT);
211 /* We currently provide no external definitions of the functions below. */
214 feenableexcept(int __mask)
216 fenv_t __old_r, __new_r;
219 __new_r = __old_r | ((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
221 return ((__old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
225 fedisableexcept(int __mask)
227 fenv_t __old_r, __new_r;
230 __new_r = __old_r & ~((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
232 return ((__old_r >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
241 return ((__r & _ENABLE_MASK) >> _FPUSW_SHIFT);
244 #endif /* __BSD_VISIBLE */
248 #endif /* !_FENV_H_ */