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63551311 | 1 | /* Store current floating-point environment. |
6d7e8eda | 2 | Copyright (C) 1997-2023 Free Software Foundation, Inc. |
63551311 | 3 | This file is part of the GNU C Library. |
63551311 UD |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
63551311 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
63551311 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
63551311 UD |
18 | |
19 | #include <fenv.h> | |
77d08aca JM |
20 | #include <unistd.h> |
21 | #include <ldsodefs.h> | |
22 | #include <dl-procinfo.h> | |
63551311 | 23 | |
63ae7b63 UD |
24 | int |
25 | __fegetenv (fenv_t *envp) | |
63551311 UD |
26 | { |
27 | __asm__ ("fnstenv %0" : "=m" (*envp)); | |
24176967 UD |
28 | /* And load it right back since the processor changes the mask. |
29 | Intel thought this opcode to be used in interrupt handlers which | |
30 | would block all exceptions. */ | |
31 | __asm__ ("fldenv %0" : : "m" (*envp)); | |
63ae7b63 | 32 | |
107e6a3c | 33 | if (CPU_FEATURE_USABLE (SSE)) |
77d08aca JM |
34 | __asm__ ("stmxcsr %0" : "=m" (envp->__eip)); |
35 | ||
63ae7b63 UD |
36 | /* Success. */ |
37 | return 0; | |
63551311 | 38 | } |
4eb8a862 RM |
39 | |
40 | #include <shlib-compat.h> | |
41 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) | |
63ae7b63 | 42 | strong_alias (__fegetenv, __old_fegetenv) |
e97ed6dd | 43 | compat_symbol (libm, __old_fegetenv, fegetenv, GLIBC_2_1); |
4eb8a862 RM |
44 | #endif |
45 | ||
73a268c7 | 46 | libm_hidden_def (__fegetenv) |
7eb22e75 | 47 | libm_hidden_ver (__fegetenv, fegetenv) |
e97ed6dd | 48 | versioned_symbol (libm, __fegetenv, fegetenv, GLIBC_2_2); |