55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/* Copyright (c) 2011 Tensilica Inc. 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 COPYRIGHT HOLDERS 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
|
|
TENSILICA INCORPORATED 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. */
|
|
|
|
#include <xtensa/config/core-isa.h>
|
|
|
|
#if XCHAL_HAVE_FP || XCHAL_HAVE_DFP
|
|
|
|
#include <fenv.h>
|
|
|
|
int feholdexcept(fenv_t * envp)
|
|
{
|
|
fexcept_t fsr;
|
|
fenv_t fcr;
|
|
/* Get the environment. */
|
|
asm ("rur.fcr %0" : "=a"(fcr));
|
|
asm ("rur.fsr %0" : "=a"(fsr));
|
|
*envp = fsr | fcr;
|
|
|
|
/* Clear the exception enable flags. */
|
|
fcr &= _FE_ROUND_MODE_MASK;
|
|
asm ("wur.fcr %0" : :"a"(fcr));
|
|
|
|
/* Clear the exception happened flags. */
|
|
fsr = 0;
|
|
asm ("wur.fsr %0" : :"a"(fsr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|