1 | /* Install given floating-point environment. |
2 | Copyright (C) 1997-2022 Free Software Foundation, Inc. |
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 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <fenv_libc.h> |
20 | |
21 | int |
22 | __fesetenv (const fenv_t *envp) |
23 | { |
24 | unsigned long int fpcr; |
25 | fenv_t env; |
26 | |
27 | /* Magic encoding of default values: high bit set (never possible for a |
28 | user-space address) is not indirect. And we don't even have to get |
29 | rid of it since we mask things around just below. */ |
30 | if ((long int) envp >= 0) |
31 | env = *envp; |
32 | else |
33 | env = (unsigned long int) envp; |
34 | |
35 | /* Reset the rounding mode with the hardware fpcr. Note that the following |
36 | system call is an implied trap barrier for our modification. */ |
37 | __asm__ __volatile__ ("excb; mf_fpcr %0" : "=f" (fpcr)); |
38 | fpcr = (fpcr & ~FPCR_ROUND_MASK) | (env & FPCR_ROUND_MASK); |
39 | __asm__ __volatile__ ("mt_fpcr %0" : : "f" (fpcr)); |
40 | |
41 | /* Reset the exception status and mask with the kernel's FP code. */ |
42 | __ieee_set_fp_control (env & SWCR_ALL_MASK); |
43 | |
44 | /* Success. */ |
45 | return 0; |
46 | } |
47 | |
48 | #include <shlib-compat.h> |
49 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
50 | strong_alias (__fesetenv, __old_fesetenv) |
51 | compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1); |
52 | #endif |
53 | |
54 | libm_hidden_def (__fesetenv) |
55 | libm_hidden_ver (__fesetenv, fesetenv) |
56 | versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2); |
57 | |