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63551311 | 1 | /* Store current floating-point environment and clear exceptions. |
dff8da6b | 2 | Copyright (C) 1997-2024 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> | |
e40468fa UD |
20 | #include <unistd.h> |
21 | #include <ldsodefs.h> | |
22 | #include <dl-procinfo.h> | |
63551311 UD |
23 | |
24 | int | |
ef9faf13 | 25 | __feholdexcept (fenv_t *envp) |
63551311 | 26 | { |
d0adc922 RH |
27 | /* Store the environment. Recall that fnstenv has a side effect of |
28 | masking all exceptions. Then clear all exceptions. */ | |
29 | __asm__ volatile ("fnstenv %0; fnclex" : "=m" (*envp)); | |
63551311 | 30 | |
e40468fa | 31 | /* If the CPU supports SSE we set the MXCSR as well. */ |
107e6a3c | 32 | if (CPU_FEATURE_USABLE (SSE)) |
e40468fa UD |
33 | { |
34 | unsigned int xwork; | |
35 | ||
36 | /* Get the current control word. */ | |
77d08aca | 37 | __asm__ ("stmxcsr %0" : "=m" (envp->__eip)); |
e40468fa | 38 | |
34317254 | 39 | /* Set all exceptions to non-stop and clear them. */ |
77d08aca | 40 | xwork = (envp->__eip | 0x1f80) & ~0x3f; |
e40468fa UD |
41 | |
42 | __asm__ ("ldmxcsr %0" : : "m" (*&xwork)); | |
43 | } | |
44 | ||
8a94dfe4 | 45 | return 0; |
63551311 | 46 | } |
ef9faf13 JM |
47 | libm_hidden_def (__feholdexcept) |
48 | weak_alias (__feholdexcept, feholdexcept) | |
49 | libm_hidden_weak (feholdexcept) |