| /* Helper functions for manipulating memory protection keys. |
| Copyright (C) 2017-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _ARCH_PKEY_H |
| #define _ARCH_PKEY_H |
| |
| /* Return the value of the PKRU register. */ |
| static inline unsigned int |
| pkey_read (void) |
| { |
| unsigned int result; |
| __asm__ volatile (".byte 0x0f, 0x01, 0xee" |
| : "=a" (result) : "c" (0) : "rdx"); |
| return result; |
| } |
| |
| /* Overwrite the PKRU register with VALUE. */ |
| static inline void |
| pkey_write (unsigned int value) |
| { |
| __asm__ volatile (".byte 0x0f, 0x01, 0xef" |
| : : "a" (value), "c" (0), "d" (0)); |
| } |
| |
| #endif /* _ARCH_PKEY_H */ |
