ports/sysdeps/m68k/fpu/feholdexcpt.c

   1 /* Store current floating-point environment and clear exceptions.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
   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 feholdexcept (fenv_t *envp)
  24 {
  25   fexcept_t fpcr, fpsr;
  26
  27   /* Store the environment.  */
  28 #ifdef __mcoldfire__
  29   __asm__ ("fmove%.l %/fpcr,%0" : "=dm" (envp->__control_register));
  30   __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (envp->__status_register));
  31   __asm__ ("fmove%.l %/fpiar,%0" : "=dm" (envp->__instruction_address));
  32 #else
  33   __asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*envp));
  34 #endif
  35
  36   /* Now clear all exceptions.  */
  37   fpsr = envp->__status_register & ~FE_ALL_EXCEPT;
  38   __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr));
  39   /* And set all exceptions to non-stop.  */
  40   fpcr = envp->__control_register & ~(FE_ALL_EXCEPT << 6);
  41   __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr));
  42
  43   return 0;
  44 }
  45 libm_hidden_def (feholdexcept);