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f10eff58 | 1 | /* Enable floating-point exceptions. |
f7a9f785 | 2 | Copyright (C) 2001-2016 Free Software Foundation, Inc. |
f10eff58 DJ |
3 | This file is part of the GNU C Library. |
4 | Contributed by Philip Blundell <philb@gnu.org>, 2001. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
22423683 | 16 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff PE |
17 | License along with the GNU C Library. If not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
f10eff58 DJ |
19 | |
20 | #include <fenv.h> | |
21 | #include <fpu_control.h> | |
a4ca5195 | 22 | #include <arm-features.h> |
f10eff58 | 23 | |
f10eff58 DJ |
24 | |
25 | int | |
26 | feenableexcept (int excepts) | |
27 | { | |
001f7b77 | 28 | fpu_control_t fpscr, new_fpscr, updated_fpscr; |
f10eff58 | 29 | |
1a2f40e5 W |
30 | /* Fail if a VFP unit isn't present. */ |
31 | if (!ARM_HAVE_VFP) | |
32 | return -1; | |
f10eff58 | 33 | |
1a2f40e5 W |
34 | _FPU_GETCW (fpscr); |
35 | excepts &= FE_ALL_EXCEPT; | |
36 | new_fpscr = fpscr | (excepts << FE_EXCEPT_SHIFT); | |
f10eff58 | 37 | |
001f7b77 | 38 | if (new_fpscr != fpscr) |
18f8524d | 39 | { |
001f7b77 W |
40 | _FPU_SETCW (new_fpscr); |
41 | ||
1a2f40e5 W |
42 | /* Not all VFP architectures support trapping exceptions, so |
43 | test whether the relevant bits were set and fail if not. */ | |
001f7b77 W |
44 | _FPU_GETCW (updated_fpscr); |
45 | ||
46 | if (new_fpscr & ~updated_fpscr) | |
1a2f40e5 | 47 | return -1; |
f10eff58 DJ |
48 | } |
49 | ||
1a2f40e5 | 50 | return (fpscr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT; |
f10eff58 | 51 | } |