| /* Store current floating-point environment and clear exceptions for |
| atomic compound assignment. e500 version. |
| Copyright (C) 2004-2014 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_libc.h> |
| #include <stdlib.h> |
| #include <sysdep.h> |
| #include <sys/prctl.h> |
| |
| void |
| __atomic_feholdexcept (fenv_t *envp) |
| { |
| fenv_union_t u; |
| INTERNAL_SYSCALL_DECL (err); |
| int r; |
| |
| /* Get the current state. */ |
| r = INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &u.l[0]); |
| if (INTERNAL_SYSCALL_ERROR_P (r, err)) |
| abort (); |
| |
| u.l[1] = fegetenv_register (); |
| *envp = u.fenv; |
| |
| /* Clear everything except for the rounding mode and trapping to the |
| kernel. */ |
| u.l[0] &= ~(PR_FP_EXC_DIV |
| | PR_FP_EXC_OVF |
| | PR_FP_EXC_UND |
| | PR_FP_EXC_RES |
| | PR_FP_EXC_INV); |
| u.l[1] &= SPEFSCR_FRMC | (SPEFSCR_ALL_EXCEPT_ENABLE & ~SPEFSCR_FINXE); |
| |
| /* Put the new state in effect. */ |
| fesetenv_register (u.l[1]); |
| r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC, |
| u.l[0] | PR_FP_EXC_SW_ENABLE); |
| if (INTERNAL_SYSCALL_ERROR_P (r, err)) |
| abort (); |
| } |
