ports/sysdeps/m68k/fpu/feenablxcpt.c

   1 /* Enable floating-point exceptions.
   2    Copyright (C) 2000-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Andreas Schwab <schwab@suse.de>, 2000.
   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
  22 int
  23 feenableexcept (int excepts)
  24 {
  25   unsigned int new_exc, old_exc;
  26
  27   /* Get the current control register contents.  */
  28   __asm__ ("fmove%.l %!,%0" : "=dm" (new_exc));
  29
  30   old_exc = (new_exc >> 6) & FE_ALL_EXCEPT;
  31
  32   excepts &= FE_ALL_EXCEPT;
  33
  34   new_exc |= excepts << 6;
  35   __asm__ ("fmove%.l %0,%!" : : "dm" (new_exc));
  36
  37   return old_exc;
  38 }