1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _ASM_X86_SHSTK_H 3#define _ASM_X86_SHSTK_H 4 5#ifndef __ASSEMBLY__ 6#include <linux/types.h> 7 8struct task_struct; 9struct ksignal; 10 11#ifdef CONFIG_X86_USER_SHADOW_STACK 12struct thread_shstk { 13 u64 base; 14 u64 size; 15}; 16 17long shstk_prctl(struct task_struct *task, int option, unsigned long arg2); 18void reset_thread_features(void); 19unsigned long shstk_alloc_thread_stack(struct task_struct *p, unsigned long clone_flags, 20 unsigned long stack_size); 21void shstk_free(struct task_struct *p); 22int setup_signal_shadow_stack(struct ksignal *ksig); 23int restore_signal_shadow_stack(void); 24#else 25static inline long shstk_prctl(struct task_struct *task, int option, 26 unsigned long arg2) { return -EINVAL; } 27static inline void reset_thread_features(void) {} 28static inline unsigned long shstk_alloc_thread_stack(struct task_struct *p, 29 unsigned long clone_flags, 30 unsigned long stack_size) { return 0; } 31static inline void shstk_free(struct task_struct *p) {} 32static inline int setup_signal_shadow_stack(struct ksignal *ksig) { return 0; } 33static inline int restore_signal_shadow_stack(void) { return 0; } 34#endif /* CONFIG_X86_USER_SHADOW_STACK */ 35 36#endif /* __ASSEMBLY__ */ 37 38#endif /* _ASM_X86_SHSTK_H */ 39