/* Install given floating-point environment.

   Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Richard Henderson <rth@tamu.edu>, 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, see

   <http://www.gnu.org/licenses/>.  */

#include <fenv_libc.h>

int

__fesetenv (const fenv_t *envp)

{

  unsigned long int fpcr;

  fenv_t env;

  /* Magic encoding of default values: high bit set (never possible for a

     user-space address) is not indirect.  And we don't even have to get

     rid of it since we mask things around just below.  */

  if ((long int) envp >= 0)

    env = *envp;

  else

    env = (unsigned long int) envp;

  /* Reset the rounding mode with the hardware fpcr.  Note that the following

     system call is an implied trap barrier for our modification.  */

  __asm__ __volatile__ ("excb; mf_fpcr %0" : "=f" (fpcr));

  fpcr = (fpcr & ~FPCR_ROUND_MASK) | (env & FPCR_ROUND_MASK);

  __asm__ __volatile__ ("mt_fpcr %0" : : "f" (fpcr));

  /* Reset the exception status and mask with the kernel's FP code.  */

  __ieee_set_fp_control (env & SWCR_ALL_MASK);

  /* Success.  */

  return 0;

}

#include <shlib-compat.h>

#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)

strong_alias (__fesetenv, __old_fesetenv)

compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1);

#endif

libm_hidden_def (__fesetenv)

libm_hidden_ver (__fesetenv, fesetenv)

versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);