sysdeps/i386/fpu/fegetenv.c

   1 /* Store current floating-point environment.
   2    Copyright (C) 1997,1999,2000,2001,2003 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <fenv.h>
  22 #include <bp-sym.h>
  23
  24 int
  25 __fegetenv (fenv_t *envp)
  26 {
  27   __asm__ ("fnstenv %0" : "=m" (*envp));
  28   /* And load it right back since the processor changes the mask.
  29      Intel thought this opcode to be used in interrupt handlers which
  30      would block all exceptions.  */
  31   __asm__ ("fldenv %0" : : "m" (*envp));
  32
  33   /* Success.  */
  34   return 0;
  35 }
  36
  37 #include <shlib-compat.h>
  38 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  39 strong_alias (__fegetenv, __old_fegetenv)
  40 compat_symbol (libm, BP_SYM (__old_fegetenv), BP_SYM (fegetenv), GLIBC_2_1);
  41 #endif
  42
  43 versioned_symbol (libm, BP_SYM (__fegetenv), BP_SYM (fegetenv), GLIBC_2_2);