1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_SHSTK_H
3 #define _ASM_X86_SHSTK_H
4
5 #ifndef __ASSEMBLER__
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, u64 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 int shstk_pop(u64 *val);
27 int shstk_push(u64 val);
28 #else
shstk_prctl(struct task_struct * task,int option,unsigned long arg2)29 static inline long shstk_prctl(struct task_struct *task, int option,
30 unsigned long arg2) { return -EINVAL; }
reset_thread_features(void)31 static inline void reset_thread_features(void) {}
shstk_alloc_thread_stack(struct task_struct * p,u64 clone_flags,unsigned long stack_size)32 static inline unsigned long shstk_alloc_thread_stack(struct task_struct *p,
33 u64 clone_flags,
34 unsigned long stack_size) { return 0; }
shstk_free(struct task_struct * p)35 static inline void shstk_free(struct task_struct *p) {}
setup_signal_shadow_stack(struct ksignal * ksig)36 static inline int setup_signal_shadow_stack(struct ksignal *ksig) { return 0; }
restore_signal_shadow_stack(void)37 static inline int restore_signal_shadow_stack(void) { return 0; }
shstk_update_last_frame(unsigned long val)38 static inline int shstk_update_last_frame(unsigned long val) { return 0; }
shstk_is_enabled(void)39 static inline bool shstk_is_enabled(void) { return false; }
shstk_pop(u64 * val)40 static inline int shstk_pop(u64 *val) { return -ENOTSUPP; }
shstk_push(u64 val)41 static inline int shstk_push(u64 val) { return -ENOTSUPP; }
42 #endif /* CONFIG_X86_USER_SHADOW_STACK */
43
44 #endif /* __ASSEMBLER__ */
45
46 #endif /* _ASM_X86_SHSTK_H */
47