uclibc-ng/libm/powerpc/e500/fpu/feholdexcpt.c

/* Store current floating-point environment and clear exceptions.
   Copyright (C) 2004, 2006 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Aldy Hernandez <aldyh@redhat.com>, 2004.

   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"
#include <syscall.h>
#include <sys/prctl.h>

int
feholdexcept (fenv_t *envp)
{
  fenv_union_t u;
  INTERNAL_SYSCALL_DECL (err);


  /* Get the current state.  */
  INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &u.l[0]);
  u.l[1] = fegetenv_register ();
  *envp = u.fenv;

  /* Clear everything except for the rounding mode.  */
  u.l[1] &= 3;

  /* Put the new state in effect.  */
  fesetenv_register (u.l[1]);

  return 0;
}
libm_hidden_def (feholdexcept)