1 | /* Store current 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.h> |
20 | #include <unistd.h> |
21 | #include <ldsodefs.h> |
22 | #include <dl-procinfo.h> |
23 | |
24 | int |
25 | __fegetenv (fenv_t *envp) |
26 | { |
27 | __asm__ ("fnstenv %0" : "=m" (*envp)); |
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)); |
32 | |
33 | if (CPU_FEATURE_USABLE (SSE)) |
34 | __asm__ ("stmxcsr %0" : "=m" (envp->__eip)); |
35 | |
36 | /* Success. */ |
37 | return 0; |
38 | } |
39 | |
40 | #include <shlib-compat.h> |
41 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
42 | strong_alias (__fegetenv, __old_fegetenv) |
43 | compat_symbol (libm, __old_fegetenv, fegetenv, GLIBC_2_1); |
44 | #endif |
45 | |
46 | libm_hidden_def (__fegetenv) |
47 | libm_hidden_ver (__fegetenv, fegetenv) |
48 | versioned_symbol (libm, __fegetenv, fegetenv, GLIBC_2_2); |
49 | |