/*      $NetBSD: fenv.h,v 1.10 2024/10/30 15:56:11 riastradh Exp $      */

/*-
* Copyright (c) 2015 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 _M68K_FENV_H_
#define _M68K_FENV_H_

#include <sys/featuretest.h>
#include <sys/stdint.h>

#include <m68k/float.h>
#include <m68k/fpreg.h>

/* Exception bits, from FPSR */
#define FE_INEXACT      FPSR_AINEX
#define FE_DIVBYZERO    FPSR_ADZ
#define FE_UNDERFLOW    FPSR_AUNFL
#define FE_OVERFLOW     FPSR_AOVFL
#define FE_INVALID      FPSR_AIOP

#define FE_ALL_EXCEPT \
   (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)

/* Rounding modes, from FPCR */
#define FE_TONEAREST    FPCR_NEAR
#define FE_TOWARDZERO   FPCR_ZERO
#define FE_DOWNWARD     FPCR_MINF
#define FE_UPWARD       FPCR_PINF

#define _ROUND_MASK     \
   (FE_TONEAREST | FE_TOWARDZERO | FE_DOWNWARD | FE_UPWARD)

#if defined(__HAVE_68881__)

#ifndef __fenv_static
#define __fenv_static   static
#endif

typedef uint32_t fexcept_t;

/* same layout as fmovem */
typedef struct {
       uint32_t fpcr;
       uint32_t fpsr;
       uint32_t fppc;
} fenv_t;

#define FE_DFL_ENV      ((fenv_t *) -1)

#define __get_fpcr(__fpcr) \
   __asm__ __volatile__ ("fmove%.l %!,%0" : "=dm" (__fpcr))
#define __set_fpcr(__fpcr) \
   __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (__fpcr))

#define __get_fpsr(__fpsr) \
   __asm__ __volatile__ ("fmove%.l %/fpsr,%0" : "=dm" (__fpsr))
#define __set_fpsr(__fpsr) \
   __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (__fpsr))

#define __fmul(__s, __t, __d) \
   do { \
           __t d = __d; \
           __asm__ __volatile__ ("fmul" __s "; fnop" : "=f" (d) : "0" (d)); \
   } while (/*CONSTCOND*/0)

#define __fdiv(__s, __t, __d) \
   do { \
           __t d = __d; \
           __asm__ __volatile__ ("fdiv" __s "; fnop" : "=f" (d) : "0" (d)); \
   } while (/*CONSTCOND*/0)

#define __fetox(__s, __t, __d) \
   do { \
           __t d = __d; \
           __asm__ __volatile__ ("fetox" __s "; fnop" : "=f" (d) : "0" (d)); \
   } while (/*CONSTCOND*/0)

#define __fgetenv(__envp) \
   __asm__ __volatile__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (__envp))

#define __fsetenv(__envp) \
   __asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr/%/fpiar" : : "m" (__envp))

__BEGIN_DECLS

#if __GNUC_PREREQ__(8, 0)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wshadow"
#endif

__fenv_static inline int
feclearexcept(int __excepts)
{
       fexcept_t __fpsr;

       __excepts &= FE_ALL_EXCEPT;

       __get_fpsr(__fpsr);
       __fpsr &= ~__excepts;
       __set_fpsr(__fpsr);

       return 0;
}

__fenv_static inline int
fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
       fexcept_t __fpsr;

       __get_fpsr(__fpsr);

       *__flagp = __fpsr & __excepts & FE_ALL_EXCEPT;

       return 0;
}

__fenv_static inline int
fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
       fexcept_t __fpsr;

       __get_fpsr(__fpsr);

       __fpsr &= ~(__excepts & FE_ALL_EXCEPT);
       __fpsr |= *__flagp & __excepts & FE_ALL_EXCEPT;

       __set_fpsr(__fpsr);

       return 0;
}

__fenv_static inline int
feraiseexcept(int __excepts)
{
       if (__excepts & FE_INVALID)     /* Inf * 0 */
               __fmul("%.s %#0r0,%0", double, __builtin_huge_val());

       if (__excepts & FE_DIVBYZERO)   /* 1.0 / 0 */
               __fdiv("%.s %#0r0,%0", double, 1.0);

       if (__excepts & FE_OVERFLOW)    /* MAX * MAX */
               __fmul("%.x %0,%0", long double, LDBL_MAX);

       if (__excepts & FE_UNDERFLOW)   /* e ^ -MAX */
               __fetox("%.x %0", long double, -LDBL_MAX);

       if (__excepts & FE_INEXACT)     /* 1 / 3 */
               __fdiv("%.s %#0r3,%0", long double, 1.0);

       return 0;
}

__fenv_static inline int
fetestexcept(int __excepts)
{
       fexcept_t __fpsr;

       __get_fpsr(__fpsr);

       return __fpsr & __excepts & FE_ALL_EXCEPT;
}

__fenv_static inline int
fegetround(void)
{
       fexcept_t __fpcr;

       __get_fpcr(__fpcr);
       return __fpcr & _ROUND_MASK;
}

__fenv_static inline int
fesetround(int __round)
{
       fexcept_t __fpcr;

       if (__round & ~_ROUND_MASK)
               return -1;

       __get_fpcr(__fpcr);

       __fpcr &= ~_ROUND_MASK;
       __fpcr |= __round;

       __set_fpcr(__fpcr);

       return 0;
}

__fenv_static inline int
fegetenv(fenv_t *__envp)
{
       __fgetenv(*__envp);

       return 0;
}

__fenv_static inline int
feholdexcept(fenv_t *__envp)
{
       fexcept_t __fpcr, __fpsr;

       __fgetenv(*__envp);
       __fpsr = __envp->fpsr & ~FE_ALL_EXCEPT;
       __set_fpsr(__fpsr);     /* clear all */
       __fpcr = __envp->fpcr & ~(FE_ALL_EXCEPT << 6);
       __set_fpcr(__fpcr);     /* set non/stop */

       return 0;
}

__fenv_static inline int
fesetenv(const fenv_t *__envp)
{
       fenv_t __tenv;

       __fgetenv(__tenv);

       if (__envp == FE_DFL_ENV) {
               __tenv.fpcr |=
                   __envp->fpcr & ((FE_ALL_EXCEPT << 6) | FE_UPWARD);
               __tenv.fpsr |= __envp->fpsr & FE_ALL_EXCEPT;
       }

       __fsetenv(__tenv);

       return 0;
}

__fenv_static inline int
feupdateenv(const fenv_t *__envp)
{
       fexcept_t __fpsr;

       __get_fpsr(__fpsr);
       __fpsr &= FE_ALL_EXCEPT;
       fesetenv(__envp);
       feraiseexcept((int)__fpsr);
       return 0;
}

#if __GNUC_PREREQ__(8, 0)
#pragma GCC diagnostic pop
#endif

#if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE)

__fenv_static inline int
feenableexcept(int __mask)
{
       fexcept_t __fpcr, __oldmask;

       __get_fpcr(__fpcr);
       __oldmask = (__fpcr >> 6) & FE_ALL_EXCEPT;
       __fpcr |= (__mask & FE_ALL_EXCEPT) << 6;
       __set_fpcr(__fpcr);

       return __oldmask;
}

__fenv_static inline int
fedisableexcept(int __mask)
{
       fexcept_t __fpcr, __oldmask;

       __get_fpcr(__fpcr);
       __oldmask = (__fpcr >> 6) & FE_ALL_EXCEPT;
       __fpcr &= ~((__mask & FE_ALL_EXCEPT) << 6);
       __set_fpcr(__fpcr);

       return __oldmask;
}

__fenv_static inline int
fegetexcept(void)
{
       fexcept_t __fpcr;

       __get_fpcr(__fpcr);

       return (__fpcr >> 6) & FE_ALL_EXCEPT;
}

#endif /* _NETBSD_SOURCE || _GNU_SOURCE */

__END_DECLS

#endif /* __HAVE_68881__ */

#endif /* _M68K_FENV_H_ */

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