56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/* Linux/x86 CET initializers function.
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Copyright (C) 2018 Free Software Foundation, Inc.
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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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<http://www.gnu.org/licenses/>. */
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#include <sys/prctl.h>
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#include <asm/prctl.h>
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static inline int __attribute__ ((always_inline))
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dl_cet_allocate_legacy_bitmap (unsigned long *legacy_bitmap)
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{
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/* Allocate legacy bitmap. */
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INTERNAL_SYSCALL_DECL (err);
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#ifdef __LP64__
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return (int) INTERNAL_SYSCALL (arch_prctl, err, 2,
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ARCH_CET_LEGACY_BITMAP, legacy_bitmap);
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#else
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unsigned long long legacy_bitmap_u64[2];
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int res = INTERNAL_SYSCALL (arch_prctl, err, 2,
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ARCH_CET_LEGACY_BITMAP, legacy_bitmap_u64);
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if (res == 0)
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{
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legacy_bitmap[0] = legacy_bitmap_u64[0];
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legacy_bitmap[1] = legacy_bitmap_u64[1];
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}
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return res;
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#endif
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}
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static inline int __attribute__ ((always_inline))
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dl_cet_disable_cet (unsigned int cet_feature)
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{
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INTERNAL_SYSCALL_DECL (err);
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return (int) INTERNAL_SYSCALL (arch_prctl, err, 2, ARCH_CET_DISABLE,
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cet_feature);
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}
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static inline int __attribute__ ((always_inline))
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dl_cet_lock_cet (void)
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{
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INTERNAL_SYSCALL_DECL (err);
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return (int) INTERNAL_SYSCALL (arch_prctl, err, 2, ARCH_CET_LOCK, 0);
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}
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