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41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* Helper functions for manipulating memory protection keys.
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Copyright (C) 2017-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _ARCH_PKEY_H
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#define _ARCH_PKEY_H
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/* Return the value of the PKRU register. */
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static inline unsigned int
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pkey_read (void)
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{
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unsigned int result;
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__asm__ volatile (".byte 0x0f, 0x01, 0xee"
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: "=a" (result) : "c" (0) : "rdx");
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return result;
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}
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/* Overwrite the PKRU register with VALUE. */
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static inline void
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pkey_write (unsigned int value)
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{
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__asm__ volatile (".byte 0x0f, 0x01, 0xef"
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: : "a" (value), "c" (0), "d" (0));
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}
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#endif /* _ARCH_PKEY_H */
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