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05ef7ce9 | 1 | /* Enable floating-point exceptions. |
afdca0f2 | 2 | Copyright (C) 1999, 2000, 2003, 2004 Free Software Foundation, Inc. |
05ef7ce9 UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Andreas Jaeger <aj@suse.de>, 1999. | |
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. | |
05ef7ce9 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. |
05ef7ce9 | 15 | |
41bdb6e2 AJ |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
05ef7ce9 UD |
20 | |
21 | #include <fenv.h> | |
e40468fa UD |
22 | #include <unistd.h> |
23 | #include <ldsodefs.h> | |
24 | #include <dl-procinfo.h> | |
05ef7ce9 UD |
25 | |
26 | int | |
27 | feenableexcept (int excepts) | |
28 | { | |
e40468fa UD |
29 | unsigned short int new_exc; |
30 | unsigned short int old_exc; | |
05ef7ce9 UD |
31 | |
32 | /* Get the current control word. */ | |
33 | __asm__ ("fstcw %0" : "=m" (*&new_exc)); | |
34 | ||
35 | excepts &= FE_ALL_EXCEPT; | |
522554b1 | 36 | old_exc = (~new_exc) & FE_ALL_EXCEPT; |
05ef7ce9 | 37 | |
ad04a62f | 38 | new_exc &= ~excepts; |
05ef7ce9 UD |
39 | __asm__ ("fldcw %0" : : "m" (*&new_exc)); |
40 | ||
e40468fa | 41 | /* If the CPU supports SSE we set the MXCSR as well. */ |
afdca0f2 | 42 | if ((GLRO(dl_hwcap) & HWCAP_I386_XMM) != 0) |
e40468fa UD |
43 | { |
44 | unsigned int xnew_exc; | |
45 | ||
46 | /* Get the current control word. */ | |
2775fdb5 | 47 | __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); |
e40468fa | 48 | |
301a6724 | 49 | xnew_exc &= ~(excepts << 7); |
e40468fa | 50 | |
2775fdb5 | 51 | __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); |
e40468fa UD |
52 | } |
53 | ||
05ef7ce9 UD |
54 | return old_exc; |
55 | } |