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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 */
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