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/* Inline functions for x86 CPU features.
This file is part of the GNU C Library.
Copyright (C) 2024 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/>. */
#ifndef _SYS_PLATFORM_X86_H
# error "Never include <bits/platform/features.h> directly; use <sys/platform/x86.h> instead."
#endif
/* Bits in the feature_1 field in TCB. */
enum
{
x86_feature_1_ibt = 1U << 0,
x86_feature_1_shstk = 1U << 1
};
static __inline__ _Bool
x86_cpu_cet_active (unsigned int __index)
{
#ifdef __x86_64__
unsigned int __feature_1;
# ifdef __LP64__
__asm__ ("mov %%fs:72, %0" : "=r" (__feature_1));
# else
__asm__ ("mov %%fs:40, %0" : "=r" (__feature_1));
# endif
if (__index == x86_cpu_IBT)
return __feature_1 & x86_feature_1_ibt;
else
return __feature_1 & x86_feature_1_shstk;
#else
return false;
#endif
}
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