ports/sysdeps/arm/fedisblxcpt.c

   1 /* Disable 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 Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  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 fedisableexcept (int excepts)
  30 {
  31   if (GLRO (dl_hwcap) & HWCAP_ARM_VFP)
  32     {
  33       unsigned long int new_exc, old_exc;
  34
  35       _FPU_GETCW(new_exc);
  36
  37       old_exc = (new_exc >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT;
  38
  39       excepts &= FE_ALL_EXCEPT;
  40
  41       new_exc &= ~(excepts << FE_EXCEPT_SHIFT);
  42
  43       _FPU_SETCW(new_exc);
  44
  45       return old_exc;
  46     }
  47
  48   /* Unsupported, so return -1 for failure.  */
  49   return -1;
  50 }