1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_UNWIND_H
3 #define _ASM_X86_UNWIND_H
5 #include <linux/sched.h>
6 #include <linux/ftrace.h>
7 #include <asm/ptrace.h>
8 #include <asm/stacktrace.h>
11 struct stack_info stack_info;
12 unsigned long stack_mask;
13 struct task_struct *task;
16 #if defined(CONFIG_UNWINDER_ORC)
17 bool signal, full_regs;
18 unsigned long sp, bp, ip;
20 #elif defined(CONFIG_UNWINDER_FRAME_POINTER)
22 unsigned long *bp, *orig_sp, ip;
29 void __unwind_start(struct unwind_state *state, struct task_struct *task,
30 struct pt_regs *regs, unsigned long *first_frame);
31 bool unwind_next_frame(struct unwind_state *state);
32 unsigned long unwind_get_return_address(struct unwind_state *state);
33 unsigned long *unwind_get_return_address_ptr(struct unwind_state *state);
35 static inline bool unwind_done(struct unwind_state *state)
37 return state->stack_info.type == STACK_TYPE_UNKNOWN;
40 static inline bool unwind_error(struct unwind_state *state)
46 void unwind_start(struct unwind_state *state, struct task_struct *task,
47 struct pt_regs *regs, unsigned long *first_frame)
49 first_frame = first_frame ? : get_stack_pointer(task, regs);
51 __unwind_start(state, task, regs, first_frame);
54 #if defined(CONFIG_UNWINDER_ORC) || defined(CONFIG_UNWINDER_FRAME_POINTER)
55 static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
57 if (unwind_done(state))
63 static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
69 #ifdef CONFIG_UNWINDER_ORC
70 void unwind_init(void);
71 void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size,
72 void *orc, size_t orc_size);
74 static inline void unwind_init(void) {}
76 void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size,
77 void *orc, size_t orc_size) {}
81 * This disables KASAN checking when reading a value from another task's stack,
82 * since the other task could be running on another CPU and could have poisoned
83 * the stack in the meantime.
85 #define READ_ONCE_TASK_STACK(task, x) \
88 if (task == current) \
91 val = READ_ONCE_NOCHECK(x); \
95 static inline bool task_on_another_cpu(struct task_struct *task)
98 return task != current && task->on_cpu;
104 #endif /* _ASM_X86_UNWIND_H */