text: /*-
   * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   *
   * 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.
   *
   * $FreeBSD$
   */
  
  #include <sys/cdefs.h>
  #include <sys/types.h>
  #include <stdint.h>
  #include <arch/x86_64/fpu.h>
  
  #define	__fenv_static
  #include "arch/x86_64/fenv.h"
  
  #ifdef __GNUC_GNU_INLINE__
  #error "This file must be compiled with C99 'inline' semantics"
  #endif
  
  const fenv_t __fe_dfl_env = {
  	{ 0xffff0000 | __INITIAL_FPUCW__,
  	  0xffff0000,
  	  0xffffffff,
  	  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff }
  	},
  	__INITIAL_MXCSR__
  };
  
  extern inline int feclearexcept(int __excepts);
  extern inline int fegetexceptflag(fexcept_t *__flagp, int __excepts);
  
  int
  fesetexceptflag(const fexcept_t *flagp, int excepts)
  {
  	fenv_t env;
  
  	__fnstenv(&env.__x87);
  	env.__x87.__status &= ~excepts;
  	env.__x87.__status |= *flagp & excepts;
  	__fldenv(env.__x87);
  
  	__stmxcsr(&env.__mxcsr);
  	env.__mxcsr &= ~excepts;
  	env.__mxcsr |= *flagp & excepts;
  	__ldmxcsr(env.__mxcsr);
  
  	return (0);
  }
  
  int
  feraiseexcept(int excepts)
  {
  	fexcept_t ex = excepts;
  
  	fesetexceptflag(&ex, excepts);
  	__fwait();
  	return (0);
  }
  
  extern inline int fetestexcept(int __excepts);
  extern inline int fegetround(void);
  extern inline int fesetround(int __round);
  
  int
  fegetenv(fenv_t *envp)
  {
  
  	__fnstenv(&envp->__x87);
  	__stmxcsr(&envp->__mxcsr);
  	/*
  	 * fnstenv masks all exceptions, so we need to restore the
  	 * control word to avoid this side effect.
  	 */
  	__fldcw(envp->__x87.__control);
  	return (0);
  }
  
  int
  feholdexcept(fenv_t *envp)
  {
  	__haiku_std_uint32 mxcsr;
  
  	__stmxcsr(&mxcsr);
  	__fnstenv(&envp->__x87);
  	__fnclex();
  	envp->__mxcsr = mxcsr;
  	mxcsr &= ~FE_ALL_EXCEPT;
  	mxcsr |= FE_ALL_EXCEPT << _SSE_EMASK_SHIFT;
  	__ldmxcsr(mxcsr);
  	return (0);
  }
  
  extern inline int fesetenv(const fenv_t *__envp);
  
  int
  feupdateenv(const fenv_t *envp)
  {
  	__haiku_std_uint32 mxcsr;
  	__haiku_std_uint16 status;
  
  	__fnstsw(&status);
  	__stmxcsr(&mxcsr);
  	fesetenv(envp);
  	feraiseexcept((mxcsr | status) & FE_ALL_EXCEPT);
  	return (0);
  }
  
  int
  __feenableexcept(int mask)
  {
  	__haiku_std_uint32 mxcsr, omask;
  	__haiku_std_uint16 control;
  
  	mask &= FE_ALL_EXCEPT;
  	__fnstcw(&control);
  	__stmxcsr(&mxcsr);
  	omask = ~(control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT;
  	control &= ~mask;
  	__fldcw(control);
  	mxcsr &= ~(mask << _SSE_EMASK_SHIFT);
  	__ldmxcsr(mxcsr);
  	return (omask);
  }
  
  int
  __fedisableexcept(int mask)
  {
  	__haiku_std_uint32 mxcsr, omask;
  	__haiku_std_uint16 control;
  
  	mask &= FE_ALL_EXCEPT;
  	__fnstcw(&control);
  	__stmxcsr(&mxcsr);
  	omask = ~(control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT;
  	control |= mask;
  	__fldcw(control);
  	mxcsr |= mask << _SSE_EMASK_SHIFT;
  	__ldmxcsr(mxcsr);
  	return (omask);
  }
  
  __weak_reference(__feenableexcept, feenableexcept);
  __weak_reference(__fedisableexcept, fedisableexcept);
  