summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/unwind.h
blob: e6676495b1259c9462723a3a8971bb61f5b4f86b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
#ifndef _ASM_X86_UNWIND_H
#define _ASM_X86_UNWIND_H

#include <linux/sched.h>
#include <linux/ftrace.h>
#include <asm/ptrace.h>
#include <asm/stacktrace.h>

struct unwind_state {
	struct stack_info stack_info;
	unsigned long stack_mask;
	struct task_struct *task;
	int graph_idx;
	bool error;
#ifdef CONFIG_FRAME_POINTER
	bool got_irq;
	unsigned long *bp, *orig_sp;
	struct pt_regs *regs;
	unsigned long ip;
#else
	unsigned long *sp;
#endif
};

void __unwind_start(struct unwind_state *state, struct task_struct *task,
		    struct pt_regs *regs, unsigned long *first_frame);

bool unwind_next_frame(struct unwind_state *state);

unsigned long unwind_get_return_address(struct unwind_state *state);

static inline bool unwind_done(struct unwind_state *state)
{
	return state->stack_info.type == STACK_TYPE_UNKNOWN;
}

static inline
void unwind_start(struct unwind_state *state, struct task_struct *task,
		  struct pt_regs *regs, unsigned long *first_frame)
{
	first_frame = first_frame ? : get_stack_pointer(task, regs);

	__unwind_start(state, task, regs, first_frame);
}

static inline bool unwind_error(struct unwind_state *state)
{
	return state->error;
}

#ifdef CONFIG_FRAME_POINTER

static inline
unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
{
	if (unwind_done(state))
		return NULL;

	return state->regs ? &state->regs->ip : state->bp + 1;
}

static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
{
	if (unwind_done(state))
		return NULL;

	return state->regs;
}

#else /* !CONFIG_FRAME_POINTER */

static inline
unsigned long *unwind_get_return_address_ptr(struct unwind_state *state)
{
	return NULL;
}

static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
{
	return NULL;
}

#endif /* CONFIG_FRAME_POINTER */

#endif /* _ASM_X86_UNWIND_H */