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/*
* Copyright (C) 2009 Android Open Source Project, All rights reserved.
* Derived from "bionic/libm/arm/fenv.h"
* Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*/
#ifndef _FENV_H_
#define _FENV_H_
#include <stdio.h>
#include <sys/types.h>
typedef uint32_t fenv_t;
typedef uint32_t fexcept_t;
/* Exception flags */
#define FE_INVALID 0x0010
#define FE_DIVBYZERO 0x0008
#define FE_OVERFLOW 0x0004
#define FE_UNDERFLOW 0x0002
#define FE_INEXACT 0x0001
#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 /* not supporetd */
#define FE_DOWNWARD 0x0003 /* not supporetd */
#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
FE_UPWARD | FE_TOWARDZERO)
/* bit shift for FPSCR mapping */
#define _FPUE_CAUSE_SHIFT 12
#define _FPUE_ENABLE_SHIFT 17
#define _FPUE_FLAG_SHIFT 2
/* bit shifters */
#define _FPUE_CAUSE(_EXCS) ((_EXCS) << _FPUE_CAUSE_SHIFT)
#define _FPUE_ENABLE(_EXCS) ((_EXCS) << _FPUE_ENABLE_SHIFT)
#define _FPUE_FLAG(_EXCS) ((_EXCS) << _FPUE_FLAG_SHIFT)
#define _GET_FPUE_CAUSE(_FPUE) (((_FPUE) >> _FPUE_CAUSE_SHIFT) & FE_ALL_EXCEPT)
#define _GET_FPUE_ENABLE(_FPUE) (((_FPUE) >> _FPUE_ENABLE_SHIFT)& FE_ALL_EXCEPT)
#define _GET_FPUE_FLAG(_FPUE) (((_FPUE) >> _FPUE_FLAG_SHIFT) & FE_ALL_EXCEPT)
/* FPSCR register accessors */
#ifdef __SH4_NOFPU__
#define __read_fpscr(_ptr)
#define __write_fpscr(_val)
#else
#define __read_fpscr(_ptr) __asm __volatile("sts fpscr, %0" : "=r" (*(_ptr)))
#define __write_fpscr(_val) __asm __volatile("lds %0, fpscr" : : "r" (_val))
#endif
/* functions for libm */
static __inline int
feclearexcept(int __excepts)
{
uint32_t __fpscr;
__read_fpscr(&__fpscr);
__fpscr &= ~_FPUE_FLAG(__excepts);
__write_fpscr(__fpscr);
return (0);
}
static __inline int
fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
uint32_t __fpscr;
__read_fpscr(&__fpscr);
*__flagp = _GET_FPUE_FLAG(__fpscr) & __excepts;
return (0);
}
static __inline int
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
uint32_t __fpscr;
__read_fpscr(&__fpscr);
__fpscr &= ~_FPUE_FLAG(__excepts);
__fpscr |= ~_FPUE_FLAG(*__flagp & __excepts);
__write_fpscr(__fpscr);
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 __ex;
fegetexceptflag(&__ex, __excepts);
return (__ex);
}
static __inline int
fegetround(void)
{
uint32_t __fpscr = 0;
__read_fpscr(&__fpscr);
return (__fpscr & _ROUND_MASK);
}
static __inline int
fesetround(int __round)
{
uint32_t __fpscr = 0;
if (__round == FE_UPWARD || __round == FE_DOWNWARD) {
fprintf(stderr, "libm superh : "
"upward/downward rounding not supporetd.\n");
return -1;
}
__read_fpscr(&__fpscr);
__fpscr &= ~_ROUND_MASK;
__fpscr |= (__round & _ROUND_MASK);
__write_fpscr(__fpscr);
return (0);
}
static __inline int
fegetenv(fenv_t *__envp)
{
__read_fpscr(__envp);
return (0);
}
static __inline int
feholdexcept(fenv_t *__envp)
{
uint32_t __fpscr;
__read_fpscr(&__fpscr);
*__envp = __fpscr;
__fpscr &= ~_FPUE_FLAG(FE_ALL_EXCEPT);
__write_fpscr(__fpscr);
return (0);
}
static __inline int
fesetenv(const fenv_t *__envp)
{
__write_fpscr(*__envp);
return (0);
}
static __inline int
feupdateenv(const fenv_t *__envp)
{
uint32_t __fpscr;
__read_fpscr(&__fpscr);
__write_fpscr(*__envp);
feraiseexcept(_GET_FPUE_FLAG(__fpscr));
return (0);
}
#if __BSD_VISIBLE
static __inline int
feenableexcept(int __mask)
{
uint32_t __old_fpscr, __new_fpscr;
__read_fpscr(&__old_fpscr);
__new_fpscr = __old_fpscr | _FPUE_ENABLE(__mask & FE_ALL_EXCEPT);
__write_fpscr(__new_fpscr);
return (_GET_FPUE_ENABLE(__old_fpscr));
}
static __inline int
fedisableexcept(int __mask)
{
uint32_t __old_fpscr, __new_fpscr;
__read_fpscr(&__old_fpscr);
__new_fpscr = __old_fpscr & ~(_FPUE_ENABLE(__mask & FE_ALL_EXCEPT));
__write_fpscr(__new_fpscr);
return (_GET_FPUE_ENABLE(__old_fpscr));
}
static __inline int
fegetexcept(void)
{
uint32_t __fpscr;
__read_fpscr(&__fpscr);
return (_GET_FPUE_ENABLE(__fpscr));
}
#endif /* __BSD_VISIBLE */
#endif /* _FENV_H_ */
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