145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/*-
|
|
* Copyright (c) 2004-2005 David Schultz <das@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: src/lib/msun/alpha/fenv.c,v 1.2 2005/03/16 19:03:44 das Exp $
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#include <machine/sysarch.h>
|
|
#include <fenv.h>
|
|
|
|
const fenv_t __fe_dfl_env = 0x680e000000000000ULL;
|
|
|
|
struct mask_args {
|
|
fenv_t mask;
|
|
};
|
|
|
|
/*
|
|
* The lower 49 bits of the FPCR are unused by the hardware, so we use
|
|
* the lower order bits to store the kernel's idea of the FP mask as
|
|
* described in the Alpha Architecture Manual.
|
|
*/
|
|
int
|
|
fegetenv(fenv_t *envp)
|
|
{
|
|
struct mask_args p;
|
|
union __fpcr r;
|
|
|
|
/*
|
|
* The syscall acts as an implicit exception barrier, so we
|
|
* only need to issue an excb after the mf_fpcr to ensure that
|
|
* the read is executed before any subsequent FP ops.
|
|
*/
|
|
sysarch(ALPHA_GET_FPMASK, (char *)&p);
|
|
__mf_fpcr(&r.__d);
|
|
*envp = r.__bits | p.mask;
|
|
__excb();
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
feholdexcept(fenv_t *envp)
|
|
{
|
|
struct mask_args p;
|
|
union __fpcr r;
|
|
|
|
sysarch(ALPHA_GET_FPMASK, (char *)&p);
|
|
__mf_fpcr(&r.__d);
|
|
*envp = r.__bits | p.mask;
|
|
r.__bits &= ~((fenv_t)FE_ALL_EXCEPT << _FPUSW_SHIFT);
|
|
__mt_fpcr(r.__d);
|
|
if (p.mask & FE_ALL_EXCEPT) {
|
|
p.mask = 0;
|
|
sysarch(ALPHA_SET_FPMASK, &p);
|
|
}
|
|
__excb();
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
fesetenv(const fenv_t *envp)
|
|
{
|
|
struct mask_args p;
|
|
union __fpcr r;
|
|
|
|
p.mask = *envp & FE_ALL_EXCEPT;
|
|
sysarch(ALPHA_SET_FPMASK, &p);
|
|
r.__bits = *envp & ~FE_ALL_EXCEPT;
|
|
__mt_fpcr(r.__d);
|
|
__excb();
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
feupdateenv(const fenv_t *envp)
|
|
{
|
|
struct mask_args p;
|
|
union __fpcr oldr, newr;
|
|
|
|
p.mask = *envp & FE_ALL_EXCEPT;
|
|
sysarch(ALPHA_SET_FPMASK, &p);
|
|
__mf_fpcr(&oldr.__d);
|
|
newr.__bits = *envp & ~FE_ALL_EXCEPT;
|
|
__excb();
|
|
__mt_fpcr(newr.__d);
|
|
feraiseexcept((oldr.__bits >> _FPUSW_SHIFT) & FE_ALL_EXCEPT);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
__feenableexcept(int mask)
|
|
{
|
|
struct mask_args p;
|
|
|
|
sysarch(ALPHA_GET_FPMASK, &p);
|
|
p.mask |= (mask & FE_ALL_EXCEPT);
|
|
sysarch(ALPHA_SET_FPMASK, &p);
|
|
return (p.mask);
|
|
}
|
|
|
|
int
|
|
__fedisableexcept(int mask)
|
|
{
|
|
struct mask_args p;
|
|
|
|
sysarch(ALPHA_GET_FPMASK, &p);
|
|
p.mask &= ~(mask & FE_ALL_EXCEPT);
|
|
sysarch(ALPHA_SET_FPMASK, &p);
|
|
return (p.mask);
|
|
}
|
|
|
|
int
|
|
__fegetexcept(void)
|
|
{
|
|
struct mask_args p;
|
|
|
|
sysarch(ALPHA_GET_FPMASK, &p);
|
|
return (p.mask);
|
|
}
|
|
|
|
__weak_reference(__feenableexcept, feenableexcept);
|
|
__weak_reference(__fedisableexcept, fedisableexcept);
|
|
__weak_reference(__fegetexcept, fegetexcept);
|