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91a1f3fe JM |
1 | /* Store current floating-point environment and clear exceptions for |
2 | atomic compound assignment. e500 version. | |
b168057a | 3 | Copyright (C) 2004-2015 Free Software Foundation, Inc. |
91a1f3fe JM |
4 | This file is part of the GNU C Library. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library. If not, see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <fenv_libc.h> | |
21 | #include <stdlib.h> | |
22 | #include <sysdep.h> | |
23 | #include <sys/prctl.h> | |
24 | ||
25 | void | |
26 | __atomic_feholdexcept (fenv_t *envp) | |
27 | { | |
28 | fenv_union_t u; | |
29 | INTERNAL_SYSCALL_DECL (err); | |
30 | int r; | |
31 | ||
32 | /* Get the current state. */ | |
33 | r = INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &u.l[0]); | |
34 | if (INTERNAL_SYSCALL_ERROR_P (r, err)) | |
35 | abort (); | |
36 | ||
37 | u.l[1] = fegetenv_register (); | |
38 | *envp = u.fenv; | |
39 | ||
40 | /* Clear everything except for the rounding mode and trapping to the | |
41 | kernel. */ | |
42 | u.l[0] &= ~(PR_FP_EXC_DIV | |
43 | | PR_FP_EXC_OVF | |
44 | | PR_FP_EXC_UND | |
45 | | PR_FP_EXC_RES | |
46 | | PR_FP_EXC_INV); | |
47 | u.l[1] &= SPEFSCR_FRMC | (SPEFSCR_ALL_EXCEPT_ENABLE & ~SPEFSCR_FINXE); | |
48 | ||
49 | /* Put the new state in effect. */ | |
50 | fesetenv_register (u.l[1]); | |
51 | r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC, | |
52 | u.l[0] | PR_FP_EXC_SW_ENABLE); | |
53 | if (INTERNAL_SYSCALL_ERROR_P (r, err)) | |
54 | abort (); | |
55 | } |