1 | /* Set floating-point environment exception handling. |
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 <math.h> |
21 | #include <unistd.h> |
22 | #include <ldsodefs.h> |
23 | #include <dl-procinfo.h> |
24 | |
25 | int |
26 | __fesetexceptflag (const fexcept_t *flagp, int excepts) |
27 | { |
28 | fenv_t temp; |
29 | |
30 | /* Get the current environment. We have to do this since we cannot |
31 | separately set the status word. */ |
32 | __asm__ ("fnstenv %0" : "=m" (*&temp)); |
33 | |
34 | temp.__status_word &= ~(excepts & FE_ALL_EXCEPT); |
35 | temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT; |
36 | |
37 | /* Store the new status word (along with the rest of the environment. |
38 | Possibly new exceptions are set but they won't get executed unless |
39 | the next floating-point instruction. */ |
40 | __asm__ ("fldenv %0" : : "m" (*&temp)); |
41 | |
42 | /* If the CPU supports SSE, we set the MXCSR as well. */ |
43 | if (CPU_FEATURE_USABLE (SSE)) |
44 | { |
45 | unsigned int xnew_exc; |
46 | |
47 | /* Get the current MXCSR. */ |
48 | __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); |
49 | |
50 | /* Set the relevant bits. */ |
51 | xnew_exc &= ~(excepts & FE_ALL_EXCEPT); |
52 | xnew_exc |= *flagp & excepts & FE_ALL_EXCEPT; |
53 | |
54 | /* Put the new data in effect. */ |
55 | __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); |
56 | } |
57 | |
58 | /* Success. */ |
59 | return 0; |
60 | } |
61 | |
62 | #include <shlib-compat.h> |
63 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
64 | strong_alias (__fesetexceptflag, __old_fesetexceptflag) |
65 | compat_symbol (libm, __old_fesetexceptflag, fesetexceptflag, GLIBC_2_1); |
66 | #endif |
67 | |
68 | versioned_symbol (libm, __fesetexceptflag, fesetexceptflag, GLIBC_2_2); |
69 | |