uclibc-ng/libm/i386/fegetenv.c

/* Store current floating-point environment.
   Copyright (C) 1997,1999,2000,2001,2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <fenv.h>

int
fegetenv (fenv_t *envp)
{
  __asm__ ("fnstenv %0" : "=m" (*envp));
  /* And load it right back since the processor changes the mask.
     Intel thought this opcode to be used in interrupt handlers which
     would block all exceptions.  */
  __asm__ ("fldenv %0" : : "m" (*envp));

  /* Success.  */
  return 0;
}