1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Most of this ideas comes from x86.
4  *
5  * Copyright (C) 2022 Loongson Technology Corporation Limited
6  */
7 #ifndef _ASM_UNWIND_H
8 #define _ASM_UNWIND_H
9 
10 #include <linux/sched.h>
11 
12 #include <asm/stacktrace.h>
13 
14 enum unwinder_type {
15 	UNWINDER_GUESS,
16 	UNWINDER_PROLOGUE,
17 };
18 
19 struct unwind_state {
20 	char type; /* UNWINDER_XXX */
21 	struct stack_info stack_info;
22 	struct task_struct *task;
23 	bool first, error;
24 	unsigned long sp, pc, ra;
25 };
26 
27 void unwind_start(struct unwind_state *state,
28 		  struct task_struct *task, struct pt_regs *regs);
29 bool unwind_next_frame(struct unwind_state *state);
30 unsigned long unwind_get_return_address(struct unwind_state *state);
31 
32 static inline bool unwind_done(struct unwind_state *state)
33 {
34 	return state->stack_info.type == STACK_TYPE_UNKNOWN;
35 }
36 
37 static inline bool unwind_error(struct unwind_state *state)
38 {
39 	return state->error;
40 }
41 
42 #endif /* _ASM_UNWIND_H */
43