1/*
2 *  Copyright (C) 1991, 1992  Linus Torvalds
3 *  Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
4 */
5
6#ifndef _ASM_X86_STACKTRACE_H
7#define _ASM_X86_STACKTRACE_H
8
9#include <linux/uaccess.h>
10#include <linux/ptrace.h>
11
12extern int kstack_depth_to_print;
13
14struct thread_info;
15struct stacktrace_ops;
16
17typedef unsigned long (*walk_stack_t)(struct thread_info *tinfo,
18				      unsigned long *stack,
19				      unsigned long bp,
20				      const struct stacktrace_ops *ops,
21				      void *data,
22				      unsigned long *end,
23				      int *graph);
24
25extern unsigned long
26print_context_stack(struct thread_info *tinfo,
27		    unsigned long *stack, unsigned long bp,
28		    const struct stacktrace_ops *ops, void *data,
29		    unsigned long *end, int *graph);
30
31extern unsigned long
32print_context_stack_bp(struct thread_info *tinfo,
33		       unsigned long *stack, unsigned long bp,
34		       const struct stacktrace_ops *ops, void *data,
35		       unsigned long *end, int *graph);
36
37/* Generic stack tracer with callbacks */
38
39struct stacktrace_ops {
40	void (*address)(void *data, unsigned long address, int reliable);
41	/* On negative return stop dumping */
42	int (*stack)(void *data, char *name);
43	walk_stack_t	walk_stack;
44};
45
46void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
47		unsigned long *stack, unsigned long bp,
48		const struct stacktrace_ops *ops, void *data);
49
50#ifdef CONFIG_X86_32
51#define STACKSLOTS_PER_LINE 8
52#define get_bp(bp) asm("movl %%ebp, %0" : "=r" (bp) :)
53#else
54#define STACKSLOTS_PER_LINE 4
55#define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)
56#endif
57
58#ifdef CONFIG_FRAME_POINTER
59static inline unsigned long
60stack_frame(struct task_struct *task, struct pt_regs *regs)
61{
62	unsigned long bp;
63
64	if (regs)
65		return regs->bp;
66
67	if (task == current) {
68		/* Grab bp right from our regs */
69		get_bp(bp);
70		return bp;
71	}
72
73	/* bp is the last reg pushed by switch_to */
74	return *(unsigned long *)task->thread.sp;
75}
76#else
77static inline unsigned long
78stack_frame(struct task_struct *task, struct pt_regs *regs)
79{
80	return 0;
81}
82#endif
83
84extern void
85show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
86		   unsigned long *stack, unsigned long bp, char *log_lvl);
87
88extern void
89show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
90		   unsigned long *sp, unsigned long bp, char *log_lvl);
91
92extern unsigned int code_bytes;
93
94/* The form of the top of the frame on the stack */
95struct stack_frame {
96	struct stack_frame *next_frame;
97	unsigned long return_address;
98};
99
100struct stack_frame_ia32 {
101    u32 next_frame;
102    u32 return_address;
103};
104
105static inline unsigned long caller_frame_pointer(void)
106{
107	struct stack_frame *frame;
108
109	get_bp(frame);
110
111#ifdef CONFIG_FRAME_POINTER
112	frame = frame->next_frame;
113#endif
114
115	return (unsigned long)frame;
116}
117
118#endif /* _ASM_X86_STACKTRACE_H */
119