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839151ff | 1 | /* Enable floating-point exceptions. |
04277e02 | 2 | Copyright (C) 2000-2019 Free Software Foundation, Inc. |
839151ff UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by David Huggins-Daines <dhd@debian.org>, 2000 | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
3214b89b AJ |
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. | |
839151ff UD |
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 | |
3214b89b | 14 | Lesser General Public License for more details. |
839151ff | 15 | |
3214b89b | 16 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff | 17 | License along with the GNU C Library. If not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
839151ff UD |
19 | |
20 | #include <fenv.h> | |
21 | ||
22 | int | |
23 | feenableexcept (int excepts) | |
24 | { | |
48dcf1c5 CD |
25 | union { unsigned long long l; unsigned int sw[2]; } s; |
26 | unsigned int old_exc; | |
839151ff UD |
27 | |
28 | /* Get the current status word. */ | |
48dcf1c5 | 29 | __asm__ ("fstd %%fr0,0(%1)" : "=m" (s.l) : "r" (&s.l) : "%r0"); |
839151ff | 30 | |
48dcf1c5 | 31 | old_exc = s.sw[0] & FE_ALL_EXCEPT; |
839151ff | 32 | |
48dcf1c5 CD |
33 | s.sw[0] |= (excepts & FE_ALL_EXCEPT); |
34 | __asm__ ("fldd 0(%0),%%fr0" : : "r" (&s.l), "m" (s.l) : "%r0"); | |
839151ff UD |
35 | |
36 | return old_exc; | |
37 | } |