51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
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/* Enable floating-point exceptions.
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Copyright (C) 2001-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <fpu_control.h>
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#include <arm-features.h>
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int
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feenableexcept (int excepts)
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{
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fpu_control_t fpscr, new_fpscr, updated_fpscr;
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/* Fail if a VFP unit isn't present. */
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if (!ARM_HAVE_VFP)
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return -1;
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_FPU_GETCW (fpscr);
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excepts &= FE_ALL_EXCEPT;
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new_fpscr = fpscr | (excepts << FE_EXCEPT_SHIFT);
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if (new_fpscr != fpscr)
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{
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_FPU_SETCW (new_fpscr);
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/* Not all VFP architectures support trapping exceptions, so
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test whether the relevant bits were set and fail if not. */
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_FPU_GETCW (updated_fpscr);
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if (new_fpscr & ~updated_fpscr)
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return -1;
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}
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return (fpscr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT;
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}
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