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63551311 | 1 | /* Set floating-point environment exception handling. |
568035b7 | 2 | Copyright (C) 1997-2013 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 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
63551311 UD |
19 | |
20 | #include <fenv.h> | |
21 | #include <math.h> | |
2fc08826 | 22 | #include <bp-sym.h> |
11bf8ce1 UD |
23 | #include <unistd.h> |
24 | #include <ldsodefs.h> | |
25 | #include <dl-procinfo.h> | |
63551311 | 26 | |
63ae7b63 UD |
27 | int |
28 | __fesetexceptflag (const fexcept_t *flagp, int excepts) | |
63551311 UD |
29 | { |
30 | fenv_t temp; | |
31 | ||
32 | /* Get the current environment. We have to do this since we cannot | |
33 | separately set the status word. */ | |
34 | __asm__ ("fnstenv %0" : "=m" (*&temp)); | |
35 | ||
33d1a2c5 UD |
36 | temp.__status_word &= ~(excepts & FE_ALL_EXCEPT); |
37 | temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT; | |
63551311 UD |
38 | |
39 | /* Store the new status word (along with the rest of the environment. | |
40 | Possibly new exceptions are set but they won't get executed unless | |
41 | the next floating-point instruction. */ | |
42 | __asm__ ("fldenv %0" : : "m" (*&temp)); | |
63ae7b63 | 43 | |
11bf8ce1 | 44 | /* If the CPU supports SSE, we set the MXCSR as well. */ |
afdca0f2 | 45 | if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0) |
11bf8ce1 UD |
46 | { |
47 | unsigned int xnew_exc; | |
48 | ||
49 | /* Get the current MXCSR. */ | |
50 | __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); | |
51 | ||
52 | /* Set the relevant bits. */ | |
53 | xnew_exc &= ~(excepts & FE_ALL_EXCEPT); | |
54 | xnew_exc |= *flagp & excepts & FE_ALL_EXCEPT; | |
55 | ||
56 | /* Put the new data in effect. */ | |
57 | __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); | |
58 | } | |
afdca0f2 | 59 | |
63ae7b63 UD |
60 | /* Success. */ |
61 | return 0; | |
63551311 | 62 | } |
4eb8a862 RM |
63 | |
64 | #include <shlib-compat.h> | |
65 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) | |
63ae7b63 | 66 | strong_alias (__fesetexceptflag, __old_fesetexceptflag) |
4eb8a862 RM |
67 | compat_symbol (libm, BP_SYM (__old_fesetexceptflag), BP_SYM (fesetexceptflag), GLIBC_2_1); |
68 | #endif | |
69 | ||
70 | versioned_symbol (libm, BP_SYM (__fesetexceptflag), BP_SYM (fesetexceptflag), GLIBC_2_2); |