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147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/*-
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* Copyright (c) 2004-2005 David Schultz <das@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 <sys/cdefs.h>
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#include <sys/types.h>
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#include <machine/fpu.h>
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#include <fenv.h>
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const fenv_t __fe_dfl_env = {
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{ 0xffff0000 | __INITIAL_FPUCW__,
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0xffff0000,
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0xffffffff,
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff }
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},
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__INITIAL_MXCSR__
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};
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int
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fesetexceptflag(const fexcept_t *flagp, int excepts)
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{
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fenv_t env;
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__fnstenv(&env.__x87);
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env.__x87.__status &= ~excepts;
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env.__x87.__status |= *flagp & excepts;
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__fldenv(env.__x87);
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__stmxcsr(&env.__mxcsr);
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env.__mxcsr &= ~excepts;
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env.__mxcsr |= *flagp & excepts;
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__ldmxcsr(env.__mxcsr);
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return (0);
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}
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int
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feraiseexcept(int excepts)
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{
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fexcept_t ex = excepts;
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fesetexceptflag(&ex, excepts);
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__fwait();
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return (0);
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}
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int
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fegetenv(fenv_t *envp)
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{
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__fnstenv(&envp->__x87);
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__stmxcsr(&envp->__mxcsr);
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/*
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* fnstenv masks all exceptions, so we need to restore the
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* control word to avoid this side effect.
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*/
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__fldcw(envp->__x87.__control);
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return (0);
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}
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int
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feholdexcept(fenv_t *envp)
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{
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int mxcsr;
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__stmxcsr(&mxcsr);
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__fnstenv(&envp->__x87);
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__fnclex();
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envp->__mxcsr = mxcsr;
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mxcsr &= ~FE_ALL_EXCEPT;
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mxcsr |= FE_ALL_EXCEPT << _SSE_EMASK_SHIFT;
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__ldmxcsr(mxcsr);
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return (0);
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}
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int
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feupdateenv(const fenv_t *envp)
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{
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int mxcsr, status;
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__fnstsw(&status);
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__stmxcsr(&mxcsr);
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fesetenv(envp);
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feraiseexcept((mxcsr | status) & FE_ALL_EXCEPT);
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return (0);
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}
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int
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__feenableexcept(int mask)
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{
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int mxcsr, control, omask;
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mask &= FE_ALL_EXCEPT;
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__fnstcw(&control);
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__stmxcsr(&mxcsr);
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omask = (control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT;
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control &= ~mask;
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__fldcw(control);
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mxcsr &= ~(mask << _SSE_EMASK_SHIFT);
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__ldmxcsr(mxcsr);
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return (~omask);
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}
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int
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__fedisableexcept(int mask)
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{
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int mxcsr, control, omask;
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mask &= FE_ALL_EXCEPT;
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__fnstcw(&control);
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__stmxcsr(&mxcsr);
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omask = (control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT;
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control |= mask;
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__fldcw(control);
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mxcsr |= mask << _SSE_EMASK_SHIFT;
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__ldmxcsr(mxcsr);
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return (~omask);
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}
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__weak_reference(__feenableexcept, feenableexcept);
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__weak_reference(__fedisableexcept, fedisableexcept);
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