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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_SHSTK_H #define _ASM_X86_SHSTK_H #ifndef __ASSEMBLY__ #include <linux/types.h> struct task_struct; struct ksignal; #ifdef CONFIG_X86_USER_SHADOW_STACK struct thread_shstk { u64 base; u64 size; }; long shstk_prctl(struct task_struct *task, int option, unsigned long arg2); void reset_thread_features(void); unsigned long shstk_alloc_thread_stack(struct task_struct *p, unsigned long clone_flags, unsigned long stack_size); void shstk_free(struct task_struct *p); int setup_signal_shadow_stack(struct ksignal *ksig); int restore_signal_shadow_stack(void); int shstk_update_last_frame(unsigned long val); bool shstk_is_enabled(void); #else static inline long shstk_prctl(struct task_struct *task, int option, unsigned long arg2) { return -EINVAL; } static inline void reset_thread_features(void) {} static inline unsigned long shstk_alloc_thread_stack(struct task_struct *p, unsigned long clone_flags, unsigned long stack_size) { return 0; } static inline void shstk_free(struct task_struct *p) {} static inline int setup_signal_shadow_stack(struct ksignal *ksig) { return 0; } static inline int restore_signal_shadow_stack(void) { return 0; } static inline int shstk_update_last_frame(unsigned long val) { return 0; } static inline bool shstk_is_enabled(void) { return false; } #endif /* CONFIG_X86_USER_SHADOW_STACK */ #endif /* __ASSEMBLY__ */ #endif /* _ASM_X86_SHSTK_H */