sysdeps/arm/eabi/feenablxcpt.c

   1 /* Enable floating-point exceptions.
   2    Copyright (C) 2001, 2005 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Philip Blundell <philb@gnu.org>, 2001.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GCC; see the file COPYING.  If not, write to the Free
  18    Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  19    02110-1301, USA.  */
  20
  21 #include <fenv.h>
  22 #include <fpu_control.h>
  23
  24 #include <unistd.h>
  25 #include <ldsodefs.h>
  26 #include <dl-procinfo.h>
  27 #include <asm/procinfo.h>
  28
  29 int
  30 feenableexcept (int excepts)
  31 {
  32   if (GLRO (dl_hwcap) & HWCAP_VFP)
  33     {
  34       unsigned long int new_exc, old_exc;
  35
  36       _FPU_GETCW(new_exc);
  37
  38       old_exc = (new_exc >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT;
  39
  40       excepts &= FE_ALL_EXCEPT;
  41
  42       new_exc |= (excepts << FE_EXCEPT_SHIFT);
  43
  44       _FPU_SETCW(new_exc);
  45
  46       return old_exc;
  47     }
  48
  49   /* Unsupported, so return -1 for failure.  */
  50   return -1;
  51 }