mirror of https://github.com/ArduPilot/ardupilot
140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
#pragma once
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#include_next <fenv.h>
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#ifndef HAVE_FEENABLEEXCEPT
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#if defined(__APPLE__) && defined(__MACH__)
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#if defined __i386__ || defined __x86_64__
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// Public domain polyfill for feenableexcept on OS X
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// http://www-personal.umich.edu/~williams/archive/computation/fe-handling-example.c
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inline int feenableexcept(unsigned int excepts)
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{
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static fenv_t fenv;
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unsigned int new_excepts = excepts & FE_ALL_EXCEPT;
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// previous masks
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unsigned int old_excepts;
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if (fegetenv(&fenv)) {
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return -1;
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}
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old_excepts = fenv.__control & FE_ALL_EXCEPT;
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// unmask
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fenv.__control &= ~new_excepts;
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fenv.__mxcsr &= ~(new_excepts << 7);
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return fesetenv(&fenv) ? -1 : old_excepts;
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}
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inline int fedisableexcept(unsigned int excepts)
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{
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static fenv_t fenv;
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unsigned int new_excepts = excepts & FE_ALL_EXCEPT;
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// all previous masks
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unsigned int old_excepts;
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if (fegetenv(&fenv)) {
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return -1;
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}
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old_excepts = fenv.__control & FE_ALL_EXCEPT;
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// mask
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fenv.__control |= new_excepts;
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fenv.__mxcsr |= new_excepts << 7;
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return fesetenv(&fenv) ? -1 : old_excepts;
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}
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#elif defined __arm64__
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/*
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Yoinked and adapted this ARM64 implementation of floating point exceptions from
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https://android.googlesource.com/platform/bionic/+/a147a1d/libm/arm64/fenv.c
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*/
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/*-
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* Copyright (c) 2004 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: libm/aarch64/fenv.c $
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*/
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#define FPCR_EXCEPT_SHIFT 8
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// FPCR, Floating-point Control Register.
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#define __get_fpcr(__fpcr) __asm__ __volatile__("mrs %0,fpcr" : "=r" (__fpcr))
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#define __set_fpcr(__fpcr) __asm__ __volatile__("msr fpcr,%0" : :"ri" (__fpcr))
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inline int feenableexcept(int mask) {
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unsigned long long old_fpcr, new_fpcr;
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__get_fpcr(old_fpcr);
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new_fpcr = old_fpcr | ((mask & FE_ALL_EXCEPT) << FPCR_EXCEPT_SHIFT);
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if (new_fpcr != old_fpcr) {
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__set_fpcr(new_fpcr);
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}
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return ((old_fpcr >> FPCR_EXCEPT_SHIFT) & FE_ALL_EXCEPT);
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}
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inline int fedisableexcept(int mask) {
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unsigned long long old_fpcr, new_fpcr;
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__get_fpcr(old_fpcr);
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new_fpcr = old_fpcr & ~((mask & FE_ALL_EXCEPT) << FPCR_EXCEPT_SHIFT);
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if (new_fpcr != old_fpcr) {
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__set_fpcr(new_fpcr);
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}
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return ((old_fpcr >> FPCR_EXCEPT_SHIFT) & FE_ALL_EXCEPT);
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}
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#endif
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#else
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inline int feenableexcept(unsigned int excepts)
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{
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#pragma STDC FENV_ACCESS ON
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fexcept_t flags;
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/* Save current exception flags. */
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fegetexceptflag(&flags, FE_ALL_EXCEPT);
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feclearexcept(FE_ALL_EXCEPT); /* clear all fp exception conditions */
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return fesetexceptflag(&flags, excepts) != 0 ? -1 : flags; /* set new flags */
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}
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inline int fedisableexcept(unsigned int excepts)
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{
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#pragma STDC FENV_ACCESS ON
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fexcept_t flags;
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/* Save current exception flags. */
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fegetexceptflag(&flags, FE_ALL_EXCEPT);
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feclearexcept(FE_ALL_EXCEPT); /* clear all fp exception conditions */
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return fesetexceptflag(&flags, ~excepts) != 0 ? -1 : flags; /* set new flags */
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}
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#endif
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#endif
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