sysdeps/alpha/fpu/fegetenv.c

   1 /* Store current floating-point environment.
   2    Copyright (C) 1997-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv_libc.h>
  20
  21 int
  22 __fegetenv (fenv_t *envp)
  23 {
  24   unsigned long int fpcr;
  25   unsigned long int swcr;
  26
  27   /* Get status from software and hardware.  Note that we don't need an
  28      excb because the callsys is an implied trap barrier.  */
  29   swcr = __ieee_get_fp_control ();
  30   __asm__ __volatile__ ("mf_fpcr %0" : "=f" (fpcr));
  31
  32   /* Merge the two bits of information.  */
  33   *envp = ((fpcr & FPCR_ROUND_MASK) | (swcr & SWCR_ALL_MASK));
  34
  35   /* Success.  */
  36   return 0;
  37 }
  38
  39 #include <shlib-compat.h>
  40 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
  41 strong_alias (__fegetenv, __old_fegetenv)
  42 compat_symbol (libm, __old_fegetenv, fegetenv, GLIBC_2_1);
  43 #endif
  44
  45 libm_hidden_def (__fegetenv)
  46 versioned_symbol (libm, __fegetenv, fegetenv, GLIBC_2_2);
  47 libm_hidden_ver(__fegetenv, fegetenv)