329 lines
7.7 KiB
C
329 lines
7.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2004 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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#define __fenv_static
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#include <fenv.h>
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#include <machine/acle-compat.h>
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#if __ARM_ARCH >= 6
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#define FENV_ARMv6
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#endif
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/* When SOFTFP_ABI is defined we are using the softfp ABI. */
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#if defined(__VFP_FP__) && !defined(__ARM_PCS_VFP)
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#define SOFTFP_ABI
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#endif
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#ifndef FENV_MANGLE
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/*
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* Hopefully the system ID byte is immutable, so it's valid to use
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* this as a default environment.
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*/
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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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#endif
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/* If this is a non-mangled softfp version special processing is required */
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#if defined(FENV_MANGLE) || !defined(SOFTFP_ABI) || !defined(FENV_ARMv6)
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/*
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* The following macros map between the softfloat emulator's flags and
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* the hardware's FPSR. The hardware this file was written for doesn't
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* have rounding control bits, so we stick those in the system ID byte.
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*/
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#ifndef __ARM_PCS_VFP
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#define __set_env(env, flags, mask, rnd) env = ((flags) \
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| (mask)<<_FPUSW_SHIFT \
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| (rnd) << 24)
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#define __env_flags(env) ((env) & FE_ALL_EXCEPT)
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#define __env_mask(env) (((env) >> _FPUSW_SHIFT) \
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& FE_ALL_EXCEPT)
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#define __env_round(env) (((env) >> 24) & _ROUND_MASK)
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#include <machine/fenv-softfloat.h>
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#else /* __ARM_PCS_VFP PRESENT */
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#include <machine/fenv-vfp.h>
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#endif /* __ARM_PCS_VFP */
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#ifdef __GNUC_GNU_INLINE__
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#error "This file must be compiled with C99 'inline' semantics"
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#endif
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extern inline int feclearexcept(int excepts);
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extern inline int fegetexceptflag(fexcept_t *flagp, int excepts);
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extern inline int fesetexceptflag(const fexcept_t *flagp, int excepts);
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extern inline int feraiseexcept(int excepts);
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extern inline int fetestexcept(int excepts);
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extern inline int fegetround(void);
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extern inline int fesetround(int round);
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extern inline int fegetenv(fenv_t *envp);
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extern inline int feholdexcept(fenv_t *envp);
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extern inline int fesetenv(const fenv_t *envp);
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extern inline int feupdateenv(const fenv_t *envp);
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extern inline int feenableexcept(int __mask);
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extern inline int fedisableexcept(int __mask);
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extern inline int fegetexcept(void);
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#else /* !FENV_MANGLE && SOFTFP_ABI */
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/* Set by libc when the VFP unit is enabled */
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int _libc_arm_fpu_present;
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int __softfp_feclearexcept(int excepts);
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int __softfp_fegetexceptflag(fexcept_t *flagp, int excepts);
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int __softfp_fesetexceptflag(const fexcept_t *flagp, int excepts);
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int __softfp_feraiseexcept(int excepts);
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int __softfp_fetestexcept(int excepts);
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int __softfp_fegetround(void);
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int __softfp_fesetround(int round);
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int __softfp_fegetenv(fenv_t *envp);
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int __softfp_feholdexcept(fenv_t *envp);
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int __softfp_fesetenv(const fenv_t *envp);
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int __softfp_feupdateenv(const fenv_t *envp);
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int __softfp_feenableexcept(int __mask);
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int __softfp_fedisableexcept(int __mask);
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int __softfp_fegetexcept(void);
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int __vfp_feclearexcept(int excepts);
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int __vfp_fegetexceptflag(fexcept_t *flagp, int excepts);
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int __vfp_fesetexceptflag(const fexcept_t *flagp, int excepts);
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int __vfp_feraiseexcept(int excepts);
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int __vfp_fetestexcept(int excepts);
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int __vfp_fegetround(void);
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int __vfp_fesetround(int round);
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int __vfp_fegetenv(fenv_t *envp);
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int __vfp_feholdexcept(fenv_t *envp);
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int __vfp_fesetenv(const fenv_t *envp);
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int __vfp_feupdateenv(const fenv_t *envp);
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int __vfp_feenableexcept(int __mask);
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int __vfp_fedisableexcept(int __mask);
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int __vfp_fegetexcept(void);
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static int
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__softfp_round_to_vfp(int round)
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{
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switch (round) {
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case FE_TONEAREST:
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default:
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return VFP_FE_TONEAREST;
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case FE_TOWARDZERO:
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return VFP_FE_TOWARDZERO;
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case FE_UPWARD:
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return VFP_FE_UPWARD;
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case FE_DOWNWARD:
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return VFP_FE_DOWNWARD;
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}
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}
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static int
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__softfp_round_from_vfp(int round)
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{
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switch (round) {
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case VFP_FE_TONEAREST:
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default:
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return FE_TONEAREST;
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case VFP_FE_TOWARDZERO:
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return FE_TOWARDZERO;
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case VFP_FE_UPWARD:
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return FE_UPWARD;
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case VFP_FE_DOWNWARD:
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return FE_DOWNWARD;
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}
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}
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int feclearexcept(int excepts)
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{
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if (_libc_arm_fpu_present)
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__vfp_feclearexcept(excepts);
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__softfp_feclearexcept(excepts);
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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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fexcept_t __vfp_flagp;
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__vfp_flagp = 0;
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if (_libc_arm_fpu_present)
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__vfp_fegetexceptflag(&__vfp_flagp, excepts);
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__softfp_fegetexceptflag(flagp, excepts);
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*flagp |= __vfp_flagp;
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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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if (_libc_arm_fpu_present)
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__vfp_fesetexceptflag(flagp, excepts);
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__softfp_fesetexceptflag(flagp, excepts);
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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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if (_libc_arm_fpu_present)
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__vfp_feraiseexcept(excepts);
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__softfp_feraiseexcept(excepts);
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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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int __got_excepts;
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__got_excepts = 0;
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if (_libc_arm_fpu_present)
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__got_excepts = __vfp_fetestexcept(excepts);
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__got_excepts |= __softfp_fetestexcept(excepts);
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return (__got_excepts);
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}
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int fegetround(void)
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{
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if (_libc_arm_fpu_present)
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return __softfp_round_from_vfp(__vfp_fegetround());
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return __softfp_fegetround();
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}
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int fesetround(int round)
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{
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if (_libc_arm_fpu_present)
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__vfp_fesetround(__softfp_round_to_vfp(round));
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__softfp_fesetround(round);
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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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fenv_t __vfp_envp;
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__vfp_envp = 0;
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if (_libc_arm_fpu_present)
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__vfp_fegetenv(&__vfp_envp);
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__softfp_fegetenv(envp);
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*envp |= __vfp_envp;
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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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fenv_t __vfp_envp;
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__vfp_envp = 0;
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if (_libc_arm_fpu_present)
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__vfp_feholdexcept(&__vfp_envp);
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__softfp_feholdexcept(envp);
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*envp |= __vfp_envp;
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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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if (_libc_arm_fpu_present)
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__vfp_fesetenv(envp);
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__softfp_fesetenv(envp);
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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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if (_libc_arm_fpu_present)
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__vfp_feupdateenv(envp);
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__softfp_feupdateenv(envp);
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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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int __unmasked;
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__unmasked = 0;
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if (_libc_arm_fpu_present)
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__unmasked = __vfp_feenableexcept(__mask);
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__unmasked |= __softfp_feenableexcept(__mask);
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return (__unmasked);
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}
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int fedisableexcept(int __mask)
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{
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int __unmasked;
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__unmasked = 0;
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if (_libc_arm_fpu_present)
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__unmasked = __vfp_fedisableexcept(__mask);
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__unmasked |= __softfp_fedisableexcept(__mask);
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return (__unmasked);
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}
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int fegetexcept(void)
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{
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int __unmasked;
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__unmasked = 0;
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if (_libc_arm_fpu_present)
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__unmasked = __vfp_fegetexcept();
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__unmasked |= __softfp_fegetexcept();
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return (__unmasked);
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}
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#endif
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