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
32 #include <sys/_types.h>
34 typedef __uint32_t fenv_t;
35 typedef __uint32_t fexcept_t;
38 #define FE_INVALID 0x0001
39 #define FE_DIVBYZERO 0x0002
40 #define FE_OVERFLOW 0x0004
41 #define FE_UNDERFLOW 0x0008
42 #define FE_INEXACT 0x0010
43 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
44 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
47 #define FE_TONEAREST 0x0000
48 #define FE_TOWARDZERO 0x0001
49 #define FE_UPWARD 0x0002
50 #define FE_DOWNWARD 0x0003
51 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
52 FE_UPWARD | FE_TOWARDZERO)
55 /* Default floating-point environment */
56 extern const fenv_t __fe_dfl_env;
57 #define FE_DFL_ENV (&__fe_dfl_env)
59 /* We need to be able to map status flag positions to mask flag positions */
60 #define _FPUSW_SHIFT 16
61 #define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT)
64 #define __rfs(__fpsr) __asm __volatile("rfs %0" : "=r" (*(__fpsr)))
65 #define __wfs(__fpsr) __asm __volatile("wfs %0" : : "r" (__fpsr))
72 feclearexcept(int __excepts)
83 fegetexceptflag(fexcept_t *__flagp, int __excepts)
88 *__flagp = __fpsr & __excepts;
93 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
99 __fpsr |= *__flagp & __excepts;
105 feraiseexcept(int __excepts)
107 fexcept_t __ex = __excepts;
109 fesetexceptflag(&__ex, __excepts); /* XXX */
114 fetestexcept(int __excepts)
119 return (__fpsr & __excepts);
127 * Apparently, the rounding mode is specified as part of the
128 * instruction format on ARM, so the dynamic rounding mode is
129 * indeterminate. Some FPUs may differ.
135 fesetround(int __round)
142 fegetenv(fenv_t *__envp)
150 feholdexcept(fenv_t *__envp)
156 __env &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
162 fesetenv(const fenv_t *__envp)
170 feupdateenv(const fenv_t *__envp)
176 feraiseexcept(__fpsr & FE_ALL_EXCEPT);
183 feenableexcept(int __mask)
185 fenv_t __old_fpsr, __new_fpsr;
188 __new_fpsr = __old_fpsr | (__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT;
190 return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
194 fedisableexcept(int __mask)
196 fenv_t __old_fpsr, __new_fpsr;
199 __new_fpsr = __old_fpsr & ~((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
201 return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
210 return ((__fpsr & _ENABLE_MASK) >> _FPUSW_SHIFT);
213 #endif /* __BSD_VISIBLE */
217 #endif /* !_FENV_H_ */