sysdeps/alpha/fpu/fegetenv.c

   1 /* Store current floating-point environment.
   2    Copyright (C) 1997-2016 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Richard Henderson <rth@tamu.edu>, 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_libc.h>
  21
  22 int
  23 __fegetenv (fenv_t *envp)
  24 {
  25   unsigned long int fpcr;
  26   unsigned long int swcr;
  27
  28   /* Get status from software and hardware.  Note that we don't need an
  29      excb because the callsys is an implied trap barrier.  */
  30   swcr = __ieee_get_fp_control ();
  31   __asm__ __volatile__ ("mf_fpcr %0" : "=f" (fpcr));
  32
  33   /* Merge the two bits of information.  */
  34   *envp = ((fpcr & FPCR_ROUND_MASK) | (swcr & SWCR_ALL_MASK));
  35
  36   /* Success.  */
  37   return 0;
  38 }
  39
  40 #include <shlib-compat.h>
  41 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  42 strong_alias (__fegetenv, __old_fegetenv)
  43 compat_symbol (libm, __old_fegetenv, fegetenv, GLIBC_2_1);
  44 #endif
  45
  46 libm_hidden_def (__fegetenv)
  47 versioned_symbol (libm, __fegetenv, fegetenv, GLIBC_2_2);
  48 libm_hidden_ver(__fegetenv, fegetenv)