sysdeps/i386/fpu/fegetenv.c

   1 /* Store current floating-point environment.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   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 __fegetenv (fenv_t *envp)
  24 {
  25   __asm__ ("fnstenv %0" : "=m" (*envp));
  26   /* And load it right back since the processor changes the mask.
  27      Intel thought this opcode to be used in interrupt handlers which
  28      would block all exceptions.  */
  29   __asm__ ("fldenv %0" : : "m" (*envp));
  30
  31   /* Success.  */
  32   return 0;
  33 }
  34
  35 #include <shlib-compat.h>
  36 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  37 strong_alias (__fegetenv, __old_fegetenv)
  38 compat_symbol (libm, __old_fegetenv, fegetenv, GLIBC_2_1);
  39 #endif
  40
  41 libm_hidden_ver (__fegetenv, fegetenv)
  42 versioned_symbol (libm, __fegetenv, fegetenv, GLIBC_2_2);