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/*-
* Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _FENV_H_
#define _FENV_H_
#include <sys/_types.h>
#ifndef __fenv_static
#define __fenv_static static
#endif
typedef __uint32_t fenv_t;
typedef __uint32_t fexcept_t;
/* Exception flags */
#define FE_INVALID 0x0001
#define FE_DIVBYZERO 0x0002
#define FE_OVERFLOW 0x0004
#define FE_UNDERFLOW 0x0008
#define FE_INEXACT 0x0010
#ifdef __ARM_PCS_VFP
#define FE_DENORMAL 0x0080
#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW | FE_DENORMAL)
#else
#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
#endif
/* Rounding modes */
#define VFP_FE_TONEAREST 0x00000000
#define VFP_FE_UPWARD 0x00400000
#define VFP_FE_DOWNWARD 0x00800000
#define VFP_FE_TOWARDZERO 0x00c00000
#ifdef __ARM_PCS_VFP
#define FE_TONEAREST VFP_FE_TONEAREST
#define FE_UPWARD VFP_FE_UPWARD
#define FE_DOWNWARD VFP_FE_DOWNWARD
#define FE_TOWARDZERO VFP_FE_TOWARDZERO
#else
#define FE_TONEAREST 0x0000
#define FE_TOWARDZERO 0x0001
#define FE_UPWARD 0x0002
#define FE_DOWNWARD 0x0003
#endif
#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
FE_UPWARD | FE_TOWARDZERO)
__BEGIN_DECLS
/* Default floating-point environment */
extern const fenv_t __fe_dfl_env;
#define FE_DFL_ENV (&__fe_dfl_env)
/* We need to be able to map status flag positions to mask flag positions */
#ifndef __ARM_PCS_VFP
#define _FPUSW_SHIFT 16
#define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT)
#endif
#ifndef __ARM_PCS_VFP
int feclearexcept(int __excepts);
int fegetexceptflag(fexcept_t *__flagp, int __excepts);
int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
int feraiseexcept(int __excepts);
int fetestexcept(int __excepts);
int fegetround(void);
int fesetround(int __round);
int fegetenv(fenv_t *__envp);
int feholdexcept(fenv_t *__envp);
int fesetenv(const fenv_t *__envp);
int feupdateenv(const fenv_t *__envp);
#if __BSD_VISIBLE
int feenableexcept(int __mask);
int fedisableexcept(int __mask);
int fegetexcept(void);
#endif
#else /* __ARM_PCS_VFP */
#define vmrs_fpscr(__r) __asm __volatile("vmrs %0, fpscr" : "=&r"(__r))
#define vmsr_fpscr(__r) __asm __volatile("vmsr fpscr, %0" : : "r"(__r))
#define _FPU_MASK_SHIFT 8
__fenv_static inline int
feclearexcept(int __excepts)
{
fexcept_t __fpsr;
vmrs_fpscr(__fpsr);
__fpsr &= ~__excepts;
vmsr_fpscr(__fpsr);
return (0);
}
__fenv_static inline int
fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
fexcept_t __fpsr;
vmrs_fpscr(__fpsr);
*__flagp = __fpsr & __excepts;
return (0);
}
__fenv_static inline int
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
fexcept_t __fpsr;
vmrs_fpscr(__fpsr);
__fpsr &= ~__excepts;
__fpsr |= *__flagp & __excepts;
vmsr_fpscr(__fpsr);
return (0);
}
__fenv_static inline int
feraiseexcept(int __excepts)
{
fexcept_t __ex = __excepts;
fesetexceptflag(&__ex, __excepts); /* XXX */
return (0);
}
__fenv_static inline int
fetestexcept(int __excepts)
{
fexcept_t __fpsr;
vmrs_fpscr(__fpsr);
return (__fpsr & __excepts);
}
__fenv_static inline int
fegetround(void)
{
fenv_t __fpsr;
vmrs_fpscr(__fpsr);
return (__fpsr & _ROUND_MASK);
}
__fenv_static inline int
fesetround(int __round)
{
fenv_t __fpsr;
vmrs_fpscr(__fpsr);
__fpsr &= ~(_ROUND_MASK);
__fpsr |= __round;
vmsr_fpscr(__fpsr);
return (0);
}
__fenv_static inline int
fegetenv(fenv_t *__envp)
{
vmrs_fpscr(*__envp);
return (0);
}
__fenv_static inline int
feholdexcept(fenv_t *__envp)
{
fenv_t __env;
vmrs_fpscr(__env);
*__envp = __env;
__env &= ~(FE_ALL_EXCEPT);
vmsr_fpscr(__env);
return (0);
}
__fenv_static inline int
fesetenv(const fenv_t *__envp)
{
vmsr_fpscr(*__envp);
return (0);
}
__fenv_static inline int
feupdateenv(const fenv_t *__envp)
{
fexcept_t __fpsr;
vmrs_fpscr(__fpsr);
vmsr_fpscr(*__envp);
feraiseexcept(__fpsr & FE_ALL_EXCEPT);
return (0);
}
#if __BSD_VISIBLE
/* We currently provide no external definitions of the functions below. */
__fenv_static inline int
feenableexcept(int __mask)
{
fenv_t __old_fpsr, __new_fpsr;
vmrs_fpscr(__old_fpsr);
__new_fpsr = __old_fpsr |
((__mask & FE_ALL_EXCEPT) << _FPU_MASK_SHIFT);
vmsr_fpscr(__new_fpsr);
return ((__old_fpsr >> _FPU_MASK_SHIFT) & FE_ALL_EXCEPT);
}
__fenv_static inline int
fedisableexcept(int __mask)
{
fenv_t __old_fpsr, __new_fpsr;
vmrs_fpscr(__old_fpsr);
__new_fpsr = __old_fpsr &
~((__mask & FE_ALL_EXCEPT) << _FPU_MASK_SHIFT);
vmsr_fpscr(__new_fpsr);
return ((__old_fpsr >> _FPU_MASK_SHIFT) & FE_ALL_EXCEPT);
}
__fenv_static inline int
fegetexcept(void)
{
fenv_t __fpsr;
vmrs_fpscr(__fpsr);
return (__fpsr & FE_ALL_EXCEPT);
}
#endif /* __BSD_VISIBLE */
#endif /* __ARM_PCS_VFP */
__END_DECLS
#endif /* !_FENV_H_ */
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