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
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