224 lines
4.4 KiB
C
224 lines
4.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
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* Copyright (c) 2013 Andrew Turner <andrew@FreeBSD.ORG>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <fenv.h>
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#ifndef __SOFTFP__
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#define vmrs_fpscr(__r) __asm __volatile("vmrs %0, fpscr" : "=&r"(__r))
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#define vmsr_fpscr(__r) __asm __volatile("vmsr fpscr, %0" : : "r"(__r))
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#define _FPU_MASK_SHIFT 8
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#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
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FE_UPWARD | FE_TOWARDZERO)
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#endif
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fenv_t __fe_dfl_env = { 0 };
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const fenv_t *_fe_dfl_env = &__fe_dfl_env;
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int feclearexcept(int excepts)
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{
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#ifndef __SOFTFP__
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fexcept_t __fpsr;
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vmrs_fpscr(__fpsr);
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__fpsr &= ~excepts;
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vmsr_fpscr(__fpsr);
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#endif
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return (0);
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}
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int fegetexceptflag(fexcept_t *flagp, int excepts)
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{
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#ifndef __SOFTFP__
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fexcept_t __fpsr;
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vmrs_fpscr(__fpsr);
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__fpsr &= ~excepts;
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__fpsr |= *flagp & excepts;
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vmsr_fpscr(__fpsr);
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#endif
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return (0);
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}
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int fesetexceptflag(const fexcept_t *flagp, int excepts)
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{
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#ifndef __SOFTFP__
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fexcept_t __fpsr;
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vmrs_fpscr(__fpsr);
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__fpsr &= ~excepts;
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__fpsr |= *flagp & excepts;
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vmsr_fpscr(__fpsr);
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#endif
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return (0);
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}
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int feraiseexcept(int excepts)
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{
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#ifndef __SOFTFP__
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fexcept_t __ex = excepts;
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fesetexceptflag(&__ex, excepts);
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#endif
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return (0);
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}
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int fetestexcept(int excepts)
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{
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#ifndef __SOFTFP__
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fexcept_t __fpsr;
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vmrs_fpscr(__fpsr);
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return (__fpsr & excepts);
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#else
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return (0);
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#endif
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}
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int fegetround(void)
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{
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#ifndef __SOFTFP__
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fenv_t __fpsr;
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vmrs_fpscr(__fpsr);
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return (__fpsr & _ROUND_MASK);
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#else
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#ifdef FE_TONEAREST
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return (FE_TONEAREST);
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#else
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return (0);
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#endif
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#endif
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}
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int fesetround(int round)
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{
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#ifndef __SOFTFP__
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fenv_t __fpsr;
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vmrs_fpscr(__fpsr);
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__fpsr &= ~(_ROUND_MASK);
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__fpsr |= round;
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vmsr_fpscr(__fpsr);
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#endif
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return (0);
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}
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int fegetenv(fenv_t *envp)
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{
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#ifndef __SOFTFP__
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vmrs_fpscr(*envp);
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#endif
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return (0);
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}
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int feholdexcept(fenv_t *envp)
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{
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#ifndef __SOFTFP__
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fenv_t __env;
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vmrs_fpscr(__env);
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*envp = __env;
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__env &= ~(FE_ALL_EXCEPT);
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vmsr_fpscr(__env);
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#endif
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return (0);
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}
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int fesetenv(const fenv_t *envp)
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{
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#ifndef __SOFTFP__
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vmsr_fpscr(*envp);
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#endif
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return (0);
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}
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int feupdateenv(const fenv_t *envp)
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{
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#ifndef __SOFTFP__
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fexcept_t __fpsr;
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vmrs_fpscr(__fpsr);
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vmsr_fpscr(*envp);
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feraiseexcept(__fpsr & FE_ALL_EXCEPT);
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#else
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#if defined(FE_NOMASK_ENV) && FE_ALL_EXCEPT != 0
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if (envp == FE_NOMASK_ENV)
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return (1);
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#endif
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#endif
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return (0);
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}
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int feenableexcept(int __mask)
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{
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#ifndef __SOFTFP__
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fenv_t __old_fpsr, __new_fpsr;
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vmrs_fpscr(__old_fpsr);
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__new_fpsr = __old_fpsr |
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((__mask & FE_ALL_EXCEPT) << _FPU_MASK_SHIFT);
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vmsr_fpscr(__new_fpsr);
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return ((__old_fpsr >> _FPU_MASK_SHIFT) & FE_ALL_EXCEPT);
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#else
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return (0);
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#endif
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}
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int fedisableexcept(int __mask)
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{
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#ifndef __SOFTFP__
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fenv_t __old_fpsr, __new_fpsr;
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vmrs_fpscr(__old_fpsr);
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__new_fpsr = __old_fpsr &
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~((__mask & FE_ALL_EXCEPT) << _FPU_MASK_SHIFT);
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vmsr_fpscr(__new_fpsr);
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return ((__old_fpsr >> _FPU_MASK_SHIFT) & FE_ALL_EXCEPT);
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#else
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return (0);
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#endif
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}
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int fegetexcept(void)
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{
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#ifndef __SOFTFP__
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fenv_t __fpsr;
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vmrs_fpscr(__fpsr);
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return (__fpsr & FE_ALL_EXCEPT);
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#else
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return (0);
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#endif
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}
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