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/* Enable floating-point exceptions.
Copyright (C) 2001-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Philip Blundell <philb@gnu.org>, 2001.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <fenv.h>
#include <fpu_control.h>
#include <arm-features.h>
int
feenableexcept (int excepts)
{
if (ARM_HAVE_VFP)
{
unsigned long int new_exc, old_exc;
_FPU_GETCW(new_exc);
old_exc = (new_exc >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT;
excepts &= FE_ALL_EXCEPT;
new_exc |= (excepts << FE_EXCEPT_SHIFT);
_FPU_SETCW(new_exc);
if (excepts != 0)
{
/* VFPv3 and VFPv4 do not support trapping exceptions, so
test whether the relevant bits were set and fail if
not. */
unsigned int temp;
_FPU_GETCW (temp);
if ((temp & (excepts << FE_EXCEPT_SHIFT))
!= (excepts << FE_EXCEPT_SHIFT))
return -1;
}
return old_exc;
}
/* Unsupported, so return -1 for failure. */
return -1;
}
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