/*--------------------------------------------------------------------

 *© Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 *--------------------------------------------------------------------

*/

/*-

 * 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>

#ifdef __WINSCW__

/*to supress warnings 'arguments not used in function' 

This warnings crop up wherever fevn.h is included. So

it is desirable to supress it here. The warning arises as a

fact that these arguments are used within macros which get

get replaced at the time of pre-processing and thus the 

compiler(s)warning 'argument/variable is not used in function*/

#pragma warn_unusedarg off

#endif //__WINSCW__

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)

{

	#ifdef __SYMBIAN32__

	fexcept_t __fpsr = 0;

	#else

	fexcept_t __fpsr ;

	#endif //__SYMBIAN32__

	__rfs(&__fpsr);

	__fpsr &= ~__excepts;

	__wfs(__fpsr);

	return (0);

}

static __inline int

fegetexceptflag(fexcept_t *__flagp, int __excepts)

{

	#ifdef __SYMBIAN32__

	fexcept_t __fpsr = 0;

	#else

	fexcept_t __fpsr ;

	#endif //__SYMBIAN32__

	__rfs(&__fpsr);

	*__flagp = __fpsr & __excepts;

	return (0);

}

static __inline int

fesetexceptflag(const fexcept_t *__flagp, int __excepts)

{

	#ifdef __SYMBIAN32__

	fexcept_t __fpsr = 0;

	#else

	fexcept_t __fpsr ;

	#endif //__SYMBIAN32__

	__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)

{

	#ifdef __SYMBIAN32__

	fexcept_t __fpsr = 0;

	#else

	fexcept_t __fpsr ;

	#endif //__SYMBIAN32__

	__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)

{

	#ifdef __SYMBIAN32__

	fenv_t __env = 0;

	#else

	fenv_t __env ;

	#endif //__SYMBIAN32__

	__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)

{

	#ifdef __SYMBIAN32__

	fexcept_t __fpsr = 0;

	#else

	fexcept_t __fpsr ;

	#endif //__SYMBIAN32__

	__rfs(&__fpsr);

	__wfs(*__envp);

	feraiseexcept(__fpsr & FE_ALL_EXCEPT);

	return (0);

}

#if __BSD_VISIBLE

static __inline int

feenableexcept(int __mask)

{

	#ifdef __SYMBIAN32__

	fenv_t __old_fpsr = 0, __new_fpsr=  0;

	#else

	fenv_t __old_fpsr, __new_fpsr;

	#endif //__SYMBIAN32__

	__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)

{

	#ifdef __SYMBIAN32__

	fenv_t __old_fpsr =0, __new_fpsr =0;

	#else

	fenv_t __old_fpsr, __new_fpsr;

	#endif //__SYMBIAN32__

	__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)

{

	#ifdef __SYMBIAN32__

	fexcept_t __fpsr = 0;

	#else

	fexcept_t __fpsr ;

	#endif //__SYMBIAN32__

	__rfs(&__fpsr);

	return ((__fpsr & _ENABLE_MASK) >> _FPUSW_SHIFT);

}

#endif /* __BSD_VISIBLE */

__END_DECLS

#endif	/* !_FENV_H_ */