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e2882c85 | 1 | /* Copyright (C) 2015-2018 Free Software Foundation, Inc. |
012b3a21 WT |
2 | |
3 | Contributed by Intel Corp. <walfred.tedeschi@intel.com> | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program 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 | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include "x86-cpuid.h" | |
19 | #include <stdio.h> | |
20 | ||
21 | #define OUR_SIZE 5 | |
22 | ||
23 | unsigned int | |
24 | have_mpx (void) | |
25 | { | |
26 | unsigned int eax, ebx, ecx, edx; | |
27 | ||
28 | if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx)) | |
29 | return 0; | |
30 | ||
31 | if ((ecx & bit_OSXSAVE) == bit_OSXSAVE) | |
32 | { | |
33 | if (__get_cpuid_max (0, NULL) < 7) | |
34 | return 0; | |
35 | ||
36 | __cpuid_count (7, 0, eax, ebx, ecx, edx); | |
37 | ||
38 | if ((ebx & bit_MPX) == bit_MPX) | |
39 | return 1; | |
40 | else | |
41 | return 0; | |
42 | } | |
43 | return 0; | |
44 | } | |
45 | ||
46 | void | |
47 | upper (int * p, int len) | |
48 | { | |
49 | int value; | |
50 | len++; /* b0-size-test. */ | |
51 | value = *(p + len); | |
52 | } | |
53 | ||
54 | int | |
55 | main (void) | |
56 | { | |
57 | if (have_mpx ()) | |
58 | { | |
59 | int a = 0; /* Dummy variable for debugging purposes. */ | |
60 | int sx[OUR_SIZE]; | |
61 | a++; /* register-eval. */ | |
62 | upper (sx, OUR_SIZE + 2); | |
63 | return sx[1]; | |
64 | } | |
65 | return 0; | |
66 | } |