mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-09 04:11:27 +08:00
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/* Enable floating-point exceptions.
|
|
Copyright (C) 2001-2014 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)
|
|
{
|
|
fpu_control_t fpscr, new_fpscr;
|
|
|
|
/* Fail if a VFP unit isn't present. */
|
|
if (!ARM_HAVE_VFP)
|
|
return -1;
|
|
|
|
_FPU_GETCW (fpscr);
|
|
excepts &= FE_ALL_EXCEPT;
|
|
new_fpscr = fpscr | (excepts << FE_EXCEPT_SHIFT);
|
|
|
|
_FPU_SETCW (new_fpscr);
|
|
|
|
if (excepts != 0)
|
|
{
|
|
/* Not all VFP architectures support trapping exceptions, so
|
|
test whether the relevant bits were set and fail if not. */
|
|
_FPU_GETCW (new_fpscr);
|
|
if ((new_fpscr & (excepts << FE_EXCEPT_SHIFT))
|
|
!= (excepts << FE_EXCEPT_SHIFT))
|
|
return -1;
|
|
}
|
|
|
|
return (fpscr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT;
|
|
}
|