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 #else
shstk_prctl(struct task_struct * task,int option,unsigned long arg2)25 static inline long shstk_prctl(struct task_struct *task, int option,
26 unsigned long arg2) { return -EINVAL; }
reset_thread_features(void)27 static inline void reset_thread_features(void) {}
shstk_alloc_thread_stack(struct task_struct * p,unsigned long clone_flags,unsigned long stack_size)28 static inline unsigned long shstk_alloc_thread_stack(struct task_struct *p,
29 unsigned long clone_flags,
30 unsigned long stack_size) { return 0; }
shstk_free(struct task_struct * p)31 static inline void shstk_free(struct task_struct *p) {}
setup_signal_shadow_stack(struct ksignal * ksig)32 static inline int setup_signal_shadow_stack(struct ksignal *ksig) { return 0; }
restore_signal_shadow_stack(void)33 static 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