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9969e62e | 1 | /* Install given floating-point control modes. e500 version. |
688903eb | 2 | Copyright (C) 2016-2018 Free Software Foundation, Inc. |
9969e62e JM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <fenv_libc.h> | |
20 | #include <sysdep.h> | |
21 | #include <sys/prctl.h> | |
22 | ||
23 | #define SPEFSCR_STATUS 0xff3eff00 | |
24 | ||
25 | int | |
26 | fesetmode (const femode_t *modep) | |
27 | { | |
28 | fenv_union_t u; | |
29 | INTERNAL_SYSCALL_DECL (err); | |
30 | int r; | |
31 | ||
32 | u.fenv = *modep; | |
33 | unsigned int spefscr = fegetenv_register (); | |
34 | spefscr = (spefscr & SPEFSCR_STATUS) | (u.l[1] & ~SPEFSCR_STATUS); | |
35 | ||
36 | fesetenv_register (spefscr); | |
37 | r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC, | |
38 | u.l[0] | PR_FP_EXC_SW_ENABLE); | |
39 | if (INTERNAL_SYSCALL_ERROR_P (r, err)) | |
40 | return -1; | |
41 | ||
42 | return 0; | |
43 | } |