ports/sysdeps/arm/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 Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv.h>
  20 #include <fpu_control.h>
  21
  22 #include <unistd.h>
  23 #include <ldsodefs.h>
  24 #include <dl-procinfo.h>
  25 #include <sysdep.h>
  26
  27 int
  28 feholdexcept (fenv_t *envp)
  29 {
  30   if (GLRO (dl_hwcap) & HWCAP_ARM_VFP)
  31     {
  32       unsigned long int temp;
  33
  34       /* Store the environment.  */
  35       _FPU_GETCW(temp);
  36       envp->__cw = temp;
  37
  38       /* Now set all exceptions to non-stop.  */
  39       temp &= ~(FE_ALL_EXCEPT << FE_EXCEPT_SHIFT);
  40
  41       /* And clear all exception flags.  */
  42       temp &= ~FE_ALL_EXCEPT;
  43
  44       _FPU_SETCW(temp);
  45
  46       return 0;
  47     }
  48
  49   /* Unsupported, so fail.  */
  50   return 1;
  51 }
  52
  53 libm_hidden_def (feholdexcept)