sysdeps/arm/eabi/feholdexcpt.c

   1 /* Store current floating-point environment and clear exceptions.
   2    Copyright (C) 1997, 1998, 1999, 2005 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with GCC; see the file COPYING.  If not, write to the Free
  17    Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  18    02110-1301, USA.  */
  19
  20 #include <fenv.h>
  21 #include <fpu_control.h>
  22
  23 #include <unistd.h>
  24 #include <ldsodefs.h>
  25 #include <dl-procinfo.h>
  26 #include <sysdep.h>
  27
  28 int
  29 feholdexcept (fenv_t *envp)
  30 {
  31   if (GLRO (dl_hwcap) & HWCAP_ARM_VFP)
  32     {
  33       unsigned long int temp;
  34
  35       /* Store the environment.  */
  36       _FPU_GETCW(temp);
  37       envp->__cw = temp;
  38
  39       /* Now set all exceptions to non-stop.  */
  40       temp &= ~(FE_ALL_EXCEPT << FE_EXCEPT_SHIFT);
  41
  42       /* And clear all exception flags.  */
  43       temp &= ~FE_ALL_EXCEPT;
  44
  45       _FPU_SETCW(temp);
  46
  47       return 0;
  48     }
  49
  50   /* Unsupported, so fail.  */
  51   return 1;
  52 }
  53
  54 libm_hidden_def (feholdexcept)