| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Enable floating-point exceptions. |
| 2 | Copyright (C) 2001-2016 Free Software Foundation, Inc. |
| 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 | |
| 16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library. If not, see |
| 18 | <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include <fenv.h> |
| 21 | #include <fpu_control.h> |
| 22 | #include <arm-features.h> |
| 23 | |
| 24 | |
| 25 | int |
| 26 | feenableexcept (int excepts) |
| 27 | { |
| 28 | fpu_control_t fpscr, new_fpscr, updated_fpscr; |
| 29 | |
| 30 | /* Fail if a VFP unit isn't present. */ |
| 31 | if (!ARM_HAVE_VFP) |
| 32 | return -1; |
| 33 | |
| 34 | _FPU_GETCW (fpscr); |
| 35 | excepts &= FE_ALL_EXCEPT; |
| 36 | new_fpscr = fpscr | (excepts << FE_EXCEPT_SHIFT); |
| 37 | |
| 38 | if (new_fpscr != fpscr) |
| 39 | { |
| 40 | _FPU_SETCW (new_fpscr); |
| 41 | |
| 42 | /* Not all VFP architectures support trapping exceptions, so |
| 43 | test whether the relevant bits were set and fail if not. */ |
| 44 | _FPU_GETCW (updated_fpscr); |
| 45 | |
| 46 | if (new_fpscr & ~updated_fpscr) |
| 47 | return -1; |
| 48 | } |
| 49 | |
| 50 | return (fpscr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT; |
| 51 | } |