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 8 struct task_struct; 9 struct ksignal; 10 11 #ifdef CONFIG_X86_USER_SHADOW_STACK 12 struct thread_shstk { 13 u64 base; 14 u64 size; 15 }; 16 17 long shstk_prctl(struct task_struct *task, int option, unsigned long arg2); 18 void reset_thread_features(void); 19 unsigned long shstk_alloc_thread_stack(struct task_struct *p, unsigned long clone_flags, 20 unsigned long stack_size); 21 void shstk_free(struct task_struct *p); 22 int setup_signal_shadow_stack(struct ksignal *ksig); 23 int restore_signal_shadow_stack(void); 24 int shstk_update_last_frame(unsigned long val); 25 bool shstk_is_enabled(void); 26 #else 27 static inline long shstk_prctl(struct task_struct *task, int option, 28 unsigned long arg2) { return -EINVAL; } 29 static inline void reset_thread_features(void) {} 30 static inline unsigned long shstk_alloc_thread_stack(struct task_struct *p, 31 unsigned long clone_flags, 32 unsigned long stack_size) { return 0; } 33 static inline void shstk_free(struct task_struct *p) {} 34 static inline int setup_signal_shadow_stack(struct ksignal *ksig) { return 0; } 35 static inline int restore_signal_shadow_stack(void) { return 0; } 36 static inline int shstk_update_last_frame(unsigned long val) { return 0; } 37 static inline bool shstk_is_enabled(void) { return false; } 38 #endif /* CONFIG_X86_USER_SHADOW_STACK */ 39 40 #endif /* __ASSEMBLY__ */ 41 42 #endif /* _ASM_X86_SHSTK_H */ 43