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
51
52
53
54
|
/* Enable floating-point exceptions. e500 version.
Copyright (C) 2004-2015 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 <sysdep.h>
#include <sys/prctl.h>
int
feenableexcept (int excepts)
{
unsigned int result = 0, pflags, r;
INTERNAL_SYSCALL_DECL (err);
r = INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &pflags);
if (INTERNAL_SYSCALL_ERROR_P (r, err))
return -1;
/* Save old enable bits. */
result = __fexcepts_from_prctl (pflags);
pflags |= __fexcepts_to_prctl (excepts);
r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC,
pflags | PR_FP_EXC_SW_ENABLE);
if (INTERNAL_SYSCALL_ERROR_P (r, err))
return -1;
/* If enabling signals for "inexact", also enable trapping to the
kernel. */
if ((excepts & FE_INEXACT) != 0)
{
unsigned long fpescr;
fpescr = fegetenv_register ();
fpescr |= SPEFSCR_FINXE;
fesetenv_register (fpescr);
}
return result;
}
|
