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63551311 | 1 | /* Set floating-point environment exception handling. |
04277e02 | 2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
63551311 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 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. | |
63551311 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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
63551311 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
63551311 UD |
19 | |
20 | #include <fenv.h> | |
21 | #include <math.h> | |
11bf8ce1 UD |
22 | #include <unistd.h> |
23 | #include <ldsodefs.h> | |
24 | #include <dl-procinfo.h> | |
63551311 | 25 | |
63ae7b63 UD |
26 | int |
27 | __fesetexceptflag (const fexcept_t *flagp, int excepts) | |
63551311 UD |
28 | { |
29 | fenv_t temp; | |
30 | ||
31 | /* Get the current environment. We have to do this since we cannot | |
32 | separately set the status word. */ | |
33 | __asm__ ("fnstenv %0" : "=m" (*&temp)); | |
34 | ||
33d1a2c5 UD |
35 | temp.__status_word &= ~(excepts & FE_ALL_EXCEPT); |
36 | temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT; | |
63551311 UD |
37 | |
38 | /* Store the new status word (along with the rest of the environment. | |
39 | Possibly new exceptions are set but they won't get executed unless | |
40 | the next floating-point instruction. */ | |
41 | __asm__ ("fldenv %0" : : "m" (*&temp)); | |
63ae7b63 | 42 | |
11bf8ce1 | 43 | /* If the CPU supports SSE, we set the MXCSR as well. */ |
bf773019 | 44 | if (HAS_CPU_FEATURE (SSE)) |
11bf8ce1 UD |
45 | { |
46 | unsigned int xnew_exc; | |
47 | ||
48 | /* Get the current MXCSR. */ | |
49 | __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); | |
50 | ||
51 | /* Set the relevant bits. */ | |
52 | xnew_exc &= ~(excepts & FE_ALL_EXCEPT); | |
53 | xnew_exc |= *flagp & excepts & FE_ALL_EXCEPT; | |
54 | ||
55 | /* Put the new data in effect. */ | |
56 | __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); | |
57 | } | |
afdca0f2 | 58 | |
63ae7b63 UD |
59 | /* Success. */ |
60 | return 0; | |
63551311 | 61 | } |
4eb8a862 RM |
62 | |
63 | #include <shlib-compat.h> | |
64 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) | |
63ae7b63 | 65 | strong_alias (__fesetexceptflag, __old_fesetexceptflag) |
e97ed6dd | 66 | compat_symbol (libm, __old_fesetexceptflag, fesetexceptflag, GLIBC_2_1); |
4eb8a862 RM |
67 | #endif |
68 | ||
e97ed6dd | 69 | versioned_symbol (libm, __fesetexceptflag, fesetexceptflag, GLIBC_2_2); |