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freebsd-dev/lib/msun/arm/fenv.c
Warner Losh 161fedb9cc From https://sourceware.org/ml/newlib/2014/msg00113.html 
By Richard Earnshaw at ARM
>
>GCC has for a number of years provides a set of pre-defined macros for
>use with determining the ISA and features of the target during
>pre-processing.  However, the design was always somewhat cumbersome in
>that each new architecture revision created a new define and then
>removed the previous one.  This meant that it was necessary to keep
>updating the support code simply to recognise a new architecture being
>added.
>
>The ACLE specification (ARM C Language Extentions)
>(http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.set.swdev/index.html)
>provides a much more suitable interface and GCC has supported this
>since gcc-4.8.
>
>This patch makes use of the ACLE pre-defines to map to the internal
>feature definitions.  To support older versions of GCC a compatibility
>header is provided that maps the traditional pre-defines onto the new
>ACLE ones.

Stop using __FreeBSD_ARCH_armv6__ and switch to __ARM_ARCH >= 6 in the
couple of places in tree. clang already implements ACLE. Add a define
that says we implement version 1.1, even though the implementation
isn't quite complete.
2014-08-14 04:20:13 +00:00

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/*-
* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
* Copyright (c) 2013 Andrew Turner <andrew@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.
*
* $FreeBSD$
*/
#define __fenv_static
#include "fenv.h"
#include <machine/acle-compat.h>
#if __ARM_ARCH >= 6
#define FENV_ARMv6
#endif
/* When SOFTFP_ABI is defined we are using the softfp ABI. */
#if defined(__VFP_FP__) && !defined(__ARM_PCS_VFP)
#define SOFTFP_ABI
#endif
#ifndef FENV_MANGLE
/*
* Hopefully the system ID byte is immutable, so it's valid to use
* this as a default environment.
*/
const fenv_t __fe_dfl_env = 0;
#endif
/* If this is a non-mangled softfp version special processing is required */
#if defined(FENV_MANGLE) || !defined(SOFTFP_ABI) || !defined(FENV_ARMv6)
/*
* The following macros map between the softfloat emulator's flags and
* the hardware's FPSR. The hardware this file was written for doesn't
* have rounding control bits, so we stick those in the system ID byte.
*/
#ifndef __ARM_PCS_VFP
#define __set_env(env, flags, mask, rnd) env = ((flags) \
| (mask)<<_FPUSW_SHIFT \
| (rnd) << 24)
#define __env_flags(env) ((env) & FE_ALL_EXCEPT)
#define __env_mask(env) (((env) >> _FPUSW_SHIFT) \
& FE_ALL_EXCEPT)
#define __env_round(env) (((env) >> 24) & _ROUND_MASK)
#include "fenv-softfloat.h"
#endif
#ifdef __GNUC_GNU_INLINE__
#error "This file must be compiled with C99 'inline' semantics"
#endif
extern inline int feclearexcept(int __excepts);
extern inline int fegetexceptflag(fexcept_t *__flagp, int __excepts);
extern inline int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
extern inline int feraiseexcept(int __excepts);
extern inline int fetestexcept(int __excepts);
extern inline int fegetround(void);
extern inline int fesetround(int __round);
extern inline int fegetenv(fenv_t *__envp);
extern inline int feholdexcept(fenv_t *__envp);
extern inline int fesetenv(const fenv_t *__envp);
extern inline int feupdateenv(const fenv_t *__envp);
extern inline int feenableexcept(int __mask);
extern inline int fedisableexcept(int __mask);
extern inline int fegetexcept(void);
#else /* !FENV_MANGLE && SOFTFP_ABI */
/* Set by libc when the VFP unit is enabled */
extern int _libc_arm_fpu_present;
int __softfp_feclearexcept(int __excepts);
int __softfp_fegetexceptflag(fexcept_t *__flagp, int __excepts);
int __softfp_fesetexceptflag(const fexcept_t *__flagp, int __excepts);
int __softfp_feraiseexcept(int __excepts);
int __softfp_fetestexcept(int __excepts);
int __softfp_fegetround(void);
int __softfp_fesetround(int __round);
int __softfp_fegetenv(fenv_t *__envp);
int __softfp_feholdexcept(fenv_t *__envp);
int __softfp_fesetenv(const fenv_t *__envp);
int __softfp_feupdateenv(const fenv_t *__envp);
int __softfp_feenableexcept(int __mask);
int __softfp_fedisableexcept(int __mask);
int __softfp_fegetexcept(void);
int __vfp_feclearexcept(int __excepts);
int __vfp_fegetexceptflag(fexcept_t *__flagp, int __excepts);
int __vfp_fesetexceptflag(const fexcept_t *__flagp, int __excepts);
int __vfp_feraiseexcept(int __excepts);
int __vfp_fetestexcept(int __excepts);
int __vfp_fegetround(void);
int __vfp_fesetround(int __round);
int __vfp_fegetenv(fenv_t *__envp);
int __vfp_feholdexcept(fenv_t *__envp);
int __vfp_fesetenv(const fenv_t *__envp);
int __vfp_feupdateenv(const fenv_t *__envp);
int __vfp_feenableexcept(int __mask);
int __vfp_fedisableexcept(int __mask);
int __vfp_fegetexcept(void);
static int
__softfp_round_to_vfp(int round)
{
switch (round) {
case FE_TONEAREST:
default:
return VFP_FE_TONEAREST;
case FE_TOWARDZERO:
return VFP_FE_TOWARDZERO;
case FE_UPWARD:
return VFP_FE_UPWARD;
case FE_DOWNWARD:
return VFP_FE_DOWNWARD;
}
}
static int
__softfp_round_from_vfp(int round)
{
switch (round) {
case VFP_FE_TONEAREST:
default:
return FE_TONEAREST;
case VFP_FE_TOWARDZERO:
return FE_TOWARDZERO;
case VFP_FE_UPWARD:
return FE_UPWARD;
case VFP_FE_DOWNWARD:
return FE_DOWNWARD;
}
}
int feclearexcept(int __excepts)
{
if (_libc_arm_fpu_present)
__vfp_feclearexcept(__excepts);
__softfp_feclearexcept(__excepts);
return (0);
}
int fegetexceptflag(fexcept_t *__flagp, int __excepts)
{
fexcept_t __vfp_flagp;
__vfp_flagp = 0;
if (_libc_arm_fpu_present)
__vfp_fegetexceptflag(&__vfp_flagp, __excepts);
__softfp_fegetexceptflag(__flagp, __excepts);
*__flagp |= __vfp_flagp;
return (0);
}
int fesetexceptflag(const fexcept_t *__flagp, int __excepts)
{
if (_libc_arm_fpu_present)
__vfp_fesetexceptflag(__flagp, __excepts);
__softfp_fesetexceptflag(__flagp, __excepts);
return (0);
}
int feraiseexcept(int __excepts)
{
if (_libc_arm_fpu_present)
__vfp_feraiseexcept(__excepts);
__softfp_feraiseexcept(__excepts);
return (0);
}
int fetestexcept(int __excepts)
{
int __got_excepts;
__got_excepts = 0;
if (_libc_arm_fpu_present)
__got_excepts = __vfp_fetestexcept(__excepts);
__got_excepts |= __softfp_fetestexcept(__excepts);
return (__got_excepts);
}
int fegetround(void)
{
if (_libc_arm_fpu_present)
return __softfp_round_from_vfp(__vfp_fegetround());
return __softfp_fegetround();
}
int fesetround(int __round)
{
if (_libc_arm_fpu_present)
__vfp_fesetround(__softfp_round_to_vfp(__round));
__softfp_fesetround(__round);
return (0);
}
int fegetenv(fenv_t *__envp)
{
fenv_t __vfp_envp;
__vfp_envp = 0;
if (_libc_arm_fpu_present)
__vfp_fegetenv(&__vfp_envp);
__softfp_fegetenv(__envp);
*__envp |= __vfp_envp;
return (0);
}
int feholdexcept(fenv_t *__envp)
{
fenv_t __vfp_envp;
__vfp_envp = 0;
if (_libc_arm_fpu_present)
__vfp_feholdexcept(&__vfp_envp);
__softfp_feholdexcept(__envp);
*__envp |= __vfp_envp;
return (0);
}
int fesetenv(const fenv_t *__envp)
{
if (_libc_arm_fpu_present)
__vfp_fesetenv(__envp);
__softfp_fesetenv(__envp);
return (0);
}
int feupdateenv(const fenv_t *__envp)
{
if (_libc_arm_fpu_present)
__vfp_feupdateenv(__envp);
__softfp_feupdateenv(__envp);
return (0);
}
int feenableexcept(int __mask)
{
int __unmasked;
__unmasked = 0;
if (_libc_arm_fpu_present)
__unmasked = __vfp_feenableexcept(__mask);
__unmasked |= __softfp_feenableexcept(__mask);
return (__unmasked);
}
int fedisableexcept(int __mask)
{
int __unmasked;
__unmasked = 0;
if (_libc_arm_fpu_present)
__unmasked = __vfp_fedisableexcept(__mask);
__unmasked |= __softfp_fedisableexcept(__mask);
return (__unmasked);
}
int fegetexcept(void)
{
int __unmasked;
__unmasked = 0;
if (_libc_arm_fpu_present)
__unmasked = __vfp_fegetexcept();
__unmasked |= __softfp_fegetexcept();
return (__unmasked);
}
#endif
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