about summary refs log tree commit diff
path: root/sysdeps/powerpc/powerpc32/e500/nofpu/atomic-feclearexcept.c
blob: 9005119f78fb9b2b3195d512c53a3fe4bcab0551 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
/* Clear floating-point exceptions for atomic compound assignment.
   e500 version.
   Copyright (C) 2004-2013 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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 <stdlib.h>
#include <sysdep.h>
#include <sys/prctl.h>

void
__atomic_feclearexcept (void)
{
  unsigned int fpescr, old_fpescr;

  /* Get the current state.  */
  old_fpescr = fpescr = fegetenv_register ();

  /* Clear the relevant bits.  */
  fpescr &= ~SPEFSCR_ALL_EXCEPT;

  /* Put the new state in effect.  */
  fesetenv_register (fpescr);

  /* Let the kernel know if the "invalid" or "underflow" bit was
     cleared.  */
  if (old_fpescr & (SPEFSCR_FINVS | SPEFSCR_FUNFS))
    {
      int pflags __attribute__ ((__unused__)), r;
      INTERNAL_SYSCALL_DECL (err);

      r = INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &pflags);
      if (INTERNAL_SYSCALL_ERROR_P (r, err))
	abort ();
    }
}