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features.h
/* 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
. */ #ifndef _SYS_PLATFORM_X86_H # error "Never include
directly; use
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 }