| /* Enable floating-point exceptions. |
| Copyright (C) 2001-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Philip Blundell <philb@gnu.org>, 2001. |
| |
| 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.h> |
| #include <fpu_control.h> |
| #include <arm-features.h> |
| |
| |
| int |
| feenableexcept (int excepts) |
| { |
| fpu_control_t fpscr, new_fpscr, updated_fpscr; |
| |
| /* Fail if a VFP unit isn't present. */ |
| if (!ARM_HAVE_VFP) |
| return -1; |
| |
| _FPU_GETCW (fpscr); |
| excepts &= FE_ALL_EXCEPT; |
| new_fpscr = fpscr | (excepts << FE_EXCEPT_SHIFT); |
| |
| if (new_fpscr != fpscr) |
| { |
| _FPU_SETCW (new_fpscr); |
| |
| /* Not all VFP architectures support trapping exceptions, so |
| test whether the relevant bits were set and fail if not. */ |
| _FPU_GETCW (updated_fpscr); |
| |
| if (new_fpscr & ~updated_fpscr) |
| return -1; |
| } |
| |
| return (fpscr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT; |
| } |
