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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: src/lib/msun/arm/fenv.h,v 1.5 2005/03/16 19:03:45 das Exp $
*/
#ifndef _FENV_H_
#define _FENV_H_
#include <sys/types.h>
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
#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
/* Rounding modes */
#define FE_TONEAREST 0x0000
#define FE_TOWARDZERO 0x0001
#define FE_UPWARD 0x0002
#define FE_DOWNWARD 0x0003
#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 */
#define _FPUSW_SHIFT 16
#define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT)
#ifdef ARM_HARD_FLOAT
#define __rfs(__fpsr) __asm __volatile("rfs %0" : "=r" (*(__fpsr)))
#define __wfs(__fpsr) __asm __volatile("wfs %0" : : "r" (__fpsr))
#else
#define __rfs(__fpsr)
#define __wfs(__fpsr)
#endif
static __inline int
feclearexcept(int __excepts)
{
fexcept_t __fpsr;
__rfs(&__fpsr);
__fpsr &= ~__excepts;
__wfs(__fpsr);
return (0);
}
static __inline int
fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
fexcept_t __fpsr;
__rfs(&__fpsr);
*__flagp = __fpsr & __excepts;
return (0);
}
static __inline int
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
fexcept_t __fpsr;
__rfs(&__fpsr);
__fpsr &= ~__excepts;
__fpsr |= *__flagp & __excepts;
__wfs(__fpsr);
return (0);
}
static __inline int
feraiseexcept(int __excepts)
{
fexcept_t __ex = __excepts;
fesetexceptflag(&__ex, __excepts); /* XXX */
return (0);
}
static __inline int
fetestexcept(int __excepts)
{
fexcept_t __fpsr;
__rfs(&__fpsr);
return (__fpsr & __excepts);
}
static __inline int
fegetround(void)
{
/*
* Apparently, the rounding mode is specified as part of the
* instruction format on ARM, so the dynamic rounding mode is
* indeterminate. Some FPUs may differ.
*/
return (-1);
}
static __inline int
fesetround(int __round)
{
return (-1);
}
static __inline int
fegetenv(fenv_t *__envp)
{
__rfs(__envp);
return (0);
}
static __inline int
feholdexcept(fenv_t *__envp)
{
fenv_t __env;
__rfs(&__env);
*__envp = __env;
__env &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
__wfs(__env);
return (0);
}
static __inline int
fesetenv(const fenv_t *__envp)
{
__wfs(*__envp);
return (0);
}
static __inline int
feupdateenv(const fenv_t *__envp)
{
fexcept_t __fpsr;
__rfs(&__fpsr);
__wfs(*__envp);
feraiseexcept(__fpsr & FE_ALL_EXCEPT);
return (0);
}
#if __BSD_VISIBLE
static __inline int
feenableexcept(int __mask)
{
fenv_t __old_fpsr, __new_fpsr;
__rfs(&__old_fpsr);
__new_fpsr = __old_fpsr | (__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT;
__wfs(__new_fpsr);
return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
}
static __inline int
fedisableexcept(int __mask)
{
fenv_t __old_fpsr, __new_fpsr;
__rfs(&__old_fpsr);
__new_fpsr = __old_fpsr & ~((__mask & FE_ALL_EXCEPT) << _FPUSW_SHIFT);
__wfs(__new_fpsr);
return ((__old_fpsr >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
}
static __inline int
fegetexcept(void)
{
fenv_t __fpsr;
__rfs(&__fpsr);
return ((__fpsr & _ENABLE_MASK) >> _FPUSW_SHIFT);
}
#endif /* __BSD_VISIBLE */
/* __END_DECLS */
#endif /* !_FENV_H_ */
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