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