| 1 | /* Enable floating-point exceptions. |
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| 2 | Copyright (C) 2001-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library. If not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <fenv.h> |
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| 20 | #include <fpu_control.h> |
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| 21 | #include <arm-features.h> |
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| 22 | |
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| 23 | |
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| 24 | int |
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| 25 | feenableexcept (int excepts) |
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| 26 | { |
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| 27 | fpu_control_t fpscr, new_fpscr, updated_fpscr; |
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| 28 | |
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| 29 | /* Fail if a VFP unit isn't present. */ |
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| 30 | if (!ARM_HAVE_VFP) |
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| 31 | return -1; |
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| 32 | |
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| 33 | _FPU_GETCW (fpscr); |
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| 34 | excepts &= FE_ALL_EXCEPT; |
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| 35 | new_fpscr = fpscr | (excepts << FE_EXCEPT_SHIFT); |
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| 36 | |
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| 37 | if (new_fpscr != fpscr) |
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| 38 | { |
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| 39 | _FPU_SETCW (new_fpscr); |
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| 40 | |
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| 41 | /* Not all VFP architectures support trapping exceptions, so |
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| 42 | test whether the relevant bits were set and fail if not. */ |
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| 43 | _FPU_GETCW (updated_fpscr); |
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| 44 | |
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| 45 | if (new_fpscr & ~updated_fpscr) |
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| 46 | return -1; |
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| 47 | } |
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| 48 | |
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| 49 | return (fpscr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT; |
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| 50 | } |
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| 51 | |
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