]>
Commit | Line | Data |
---|---|---|
446d22e9 | 1 | /* Helper functions for manipulating memory protection keys. |
04277e02 | 2 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
446d22e9 FW |
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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #ifndef _ARCH_PKEY_H | |
20 | #define _ARCH_PKEY_H | |
21 | ||
22 | /* Return the value of the PKRU register. */ | |
23 | static inline unsigned int | |
24 | pkey_read (void) | |
25 | { | |
26 | unsigned int result; | |
27 | __asm__ volatile (".byte 0x0f, 0x01, 0xee" | |
28 | : "=a" (result) : "c" (0) : "rdx"); | |
29 | return result; | |
30 | } | |
31 | ||
32 | /* Overwrite the PKRU register with VALUE. */ | |
33 | static inline void | |
34 | pkey_write (unsigned int value) | |
35 | { | |
36 | __asm__ volatile (".byte 0x0f, 0x01, 0xef" | |
37 | : : "a" (value), "c" (0), "d" (0)); | |
38 | } | |
39 | ||
40 | #endif /* _ARCH_PKEY_H */ |