diff options
Diffstat (limited to 'REORG.TODO/sysdeps/arm/feenablxcpt.c')
-rw-r--r-- | REORG.TODO/sysdeps/arm/feenablxcpt.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/arm/feenablxcpt.c b/REORG.TODO/sysdeps/arm/feenablxcpt.c new file mode 100644 index 0000000000..6e36371da3 --- /dev/null +++ b/REORG.TODO/sysdeps/arm/feenablxcpt.c @@ -0,0 +1,51 @@ +/* Enable floating-point exceptions. + Copyright (C) 2001-2017 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; +} |