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
12 extern int kstack_depth_to_print;
13
14 struct thread_info;
15 struct stacktrace_ops;
16
17 typedef 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
25 extern unsigned long
26 print_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
31 extern unsigned long
32 print_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
39 struct 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
46 void 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
59 static inline unsigned long
stack_frame(struct task_struct * task,struct pt_regs * regs)60 stack_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
77 static inline unsigned long
stack_frame(struct task_struct * task,struct pt_regs * regs)78 stack_frame(struct task_struct *task, struct pt_regs *regs)
79 {
80 return 0;
81 }
82 #endif
83
84 extern void
85 show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
86 unsigned long *stack, unsigned long bp, char *log_lvl);
87
88 extern void
89 show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
90 unsigned long *sp, unsigned long bp, char *log_lvl);
91
92 extern unsigned int code_bytes;
93
94 /* The form of the top of the frame on the stack */
95 struct stack_frame {
96 struct stack_frame *next_frame;
97 unsigned long return_address;
98 };
99
100 struct stack_frame_ia32 {
101 u32 next_frame;
102 u32 return_address;
103 };
104
caller_frame_pointer(void)105 static 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