| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _ASM_X86_SHSTK_H |
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| 3 | #define _ASM_X86_SHSTK_H |
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| 4 | |
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| 5 | #ifndef __ASSEMBLER__ |
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| 6 | #include <linux/types.h> |
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| 7 | |
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| 8 | struct task_struct; |
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| 9 | struct ksignal; |
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| 10 | |
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| 11 | #ifdef CONFIG_X86_USER_SHADOW_STACK |
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| 12 | struct thread_shstk { |
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| 13 | u64 base; |
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| 14 | u64 size; |
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| 15 | }; |
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| 16 | |
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| 17 | long shstk_prctl(struct task_struct *task, int option, unsigned long arg2); |
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| 18 | void reset_thread_features(void); |
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| 19 | unsigned long shstk_alloc_thread_stack(struct task_struct *p, u64 clone_flags, |
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| 20 | unsigned long stack_size); |
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| 21 | void shstk_free(struct task_struct *p); |
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| 22 | int setup_signal_shadow_stack(struct ksignal *ksig); |
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| 23 | int restore_signal_shadow_stack(void); |
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| 24 | int shstk_update_last_frame(unsigned long val); |
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| 25 | bool shstk_is_enabled(void); |
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| 26 | int shstk_pop(u64 *val); |
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| 27 | int shstk_push(u64 val); |
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| 28 | #else |
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| 29 | static inline long shstk_prctl(struct task_struct *task, int option, |
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| 30 | unsigned long arg2) { return -EINVAL; } |
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| 31 | static inline void reset_thread_features(void) {} |
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| 32 | static inline unsigned long shstk_alloc_thread_stack(struct task_struct *p, |
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| 33 | u64 clone_flags, |
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| 34 | unsigned long stack_size) { return 0; } |
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| 35 | static inline void shstk_free(struct task_struct *p) {} |
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| 36 | static inline int setup_signal_shadow_stack(struct ksignal *ksig) { return 0; } |
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| 37 | static inline int restore_signal_shadow_stack(void) { return 0; } |
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| 38 | static inline int shstk_update_last_frame(unsigned long val) { return 0; } |
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| 39 | static inline bool shstk_is_enabled(void) { return false; } |
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| 40 | static inline int shstk_pop(u64 *val) { return -ENOTSUPP; } |
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| 41 | static inline int shstk_push(u64 val) { return -ENOTSUPP; } |
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| 42 | #endif /* CONFIG_X86_USER_SHADOW_STACK */ |
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| 43 | |
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| 44 | #endif /* __ASSEMBLER__ */ |
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| 45 | |
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| 46 | #endif /* _ASM_X86_SHSTK_H */ |
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| 47 | |
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