diff options
Diffstat (limited to 'REORG.TODO/sysdeps/aarch64/fpu/feenablxcpt.c')
-rw-r--r-- | REORG.TODO/sysdeps/aarch64/fpu/feenablxcpt.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/aarch64/fpu/feenablxcpt.c b/REORG.TODO/sysdeps/aarch64/fpu/feenablxcpt.c new file mode 100644 index 0000000000..029ef1db8b --- /dev/null +++ b/REORG.TODO/sysdeps/aarch64/fpu/feenablxcpt.c @@ -0,0 +1,47 @@ +/* Copyright (C) 2001-2017 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + 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> + +int +feenableexcept (int excepts) +{ + fpu_control_t fpcr; + fpu_control_t fpcr_new; + fpu_control_t updated_fpcr; + + _FPU_GETCW (fpcr); + excepts &= FE_ALL_EXCEPT; + fpcr_new = fpcr | (excepts << FE_EXCEPT_SHIFT); + + if (fpcr != fpcr_new) + { + _FPU_SETCW (fpcr_new); + + /* Trapping exceptions are optional in AArch64; the relevant enable + bits in FPCR are RES0 hence the absence of support can be detected + by reading back the FPCR and comparing with the required value. */ + _FPU_GETCW (updated_fpcr); + + if (fpcr_new & ~updated_fpcr) + return -1; + } + + return (fpcr >> FE_EXCEPT_SHIFT) & FE_ALL_EXCEPT; +} |