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91650f79 | 1 | /* Install given floating-point environment. |
04277e02 | 2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
91650f79 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Richard Henderson <rth@tamu.edu>, 1997 | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
3214b89b AJ |
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. | |
91650f79 UD |
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 | |
3214b89b | 14 | Lesser General Public License for more details. |
91650f79 | 15 | |
3214b89b | 16 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff PE |
17 | License along with the GNU C Library. If not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
91650f79 | 19 | |
c9bca511 | 20 | #include <fenv_libc.h> |
91650f79 | 21 | |
146bade7 UD |
22 | int |
23 | __fesetenv (const fenv_t *envp) | |
91650f79 | 24 | { |
146bade7 | 25 | unsigned long int fpcr; |
91650f79 UD |
26 | fenv_t env; |
27 | ||
28 | /* Magic encoding of default values: high bit set (never possible for a | |
29 | user-space address) is not indirect. And we don't even have to get | |
30 | rid of it since we mask things around just below. */ | |
146bade7 | 31 | if ((long int) envp >= 0) |
91650f79 UD |
32 | env = *envp; |
33 | else | |
146bade7 | 34 | env = (unsigned long int) envp; |
91650f79 UD |
35 | |
36 | /* Reset the rounding mode with the hardware fpcr. Note that the following | |
37 | system call is an implied trap barrier for our modification. */ | |
146bade7 | 38 | __asm__ __volatile__ ("excb; mf_fpcr %0" : "=f" (fpcr)); |
c9bca511 | 39 | fpcr = (fpcr & ~FPCR_ROUND_MASK) | (env & FPCR_ROUND_MASK); |
146bade7 | 40 | __asm__ __volatile__ ("mt_fpcr %0" : : "f" (fpcr)); |
91650f79 UD |
41 | |
42 | /* Reset the exception status and mask with the kernel's FP code. */ | |
c9bca511 | 43 | __ieee_set_fp_control (env & SWCR_ALL_MASK); |
146bade7 UD |
44 | |
45 | /* Success. */ | |
46 | return 0; | |
91650f79 | 47 | } |
60446d7a RM |
48 | |
49 | #include <shlib-compat.h> | |
50 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) | |
146bade7 | 51 | strong_alias (__fesetenv, __old_fesetenv) |
60446d7a RM |
52 | compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1); |
53 | #endif | |
54 | ||
cd42798a | 55 | libm_hidden_def (__fesetenv) |
280ad607 | 56 | libm_hidden_ver (__fesetenv, fesetenv) |
60446d7a | 57 | versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2); |