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/* Linux/x86 CET initializers function.
Copyright (C) 2018-2020 Free Software Foundation, Inc.
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
<https://www.gnu.org/licenses/>. */
#include <sys/prctl.h>
#include <asm/prctl.h>
static inline int __attribute__ ((always_inline))
dl_cet_allocate_legacy_bitmap (unsigned long *legacy_bitmap)
{
/* Allocate legacy bitmap. */
INTERNAL_SYSCALL_DECL (err);
#ifdef __LP64__
return (int) INTERNAL_SYSCALL (arch_prctl, err, 2,
ARCH_CET_LEGACY_BITMAP, legacy_bitmap);
#else
unsigned long long legacy_bitmap_u64[2];
int res = INTERNAL_SYSCALL (arch_prctl, err, 2,
ARCH_CET_LEGACY_BITMAP, legacy_bitmap_u64);
if (res == 0)
{
legacy_bitmap[0] = legacy_bitmap_u64[0];
legacy_bitmap[1] = legacy_bitmap_u64[1];
}
return res;
#endif
}
static inline int __attribute__ ((always_inline))
dl_cet_disable_cet (unsigned int cet_feature)
{
INTERNAL_SYSCALL_DECL (err);
return (int) INTERNAL_SYSCALL (arch_prctl, err, 2, ARCH_CET_DISABLE,
cet_feature);
}
static inline int __attribute__ ((always_inline))
dl_cet_lock_cet (void)
{
INTERNAL_SYSCALL_DECL (err);
return (int) INTERNAL_SYSCALL (arch_prctl, err, 2, ARCH_CET_LOCK, 0);
}
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