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 #include <asm/switch_to.h>
12
13 enum stack_type {
14 STACK_TYPE_UNKNOWN,
15 STACK_TYPE_TASK,
16 STACK_TYPE_IRQ,
17 STACK_TYPE_SOFTIRQ,
18 STACK_TYPE_EXCEPTION,
19 STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1,
20 };
21
22 struct stack_info {
23 enum stack_type type;
24 unsigned long *begin, *end, *next_sp;
25 };
26
27 bool in_task_stack(unsigned long *stack, struct task_struct *task,
28 struct stack_info *info);
29
30 int get_stack_info(unsigned long *stack, struct task_struct *task,
31 struct stack_info *info, unsigned long *visit_mask);
32
33 void stack_type_str(enum stack_type type, const char **begin,
34 const char **end);
35
on_stack(struct stack_info * info,void * addr,size_t len)36 static inline bool on_stack(struct stack_info *info, void *addr, size_t len)
37 {
38 void *begin = info->begin;
39 void *end = info->end;
40
41 return (info->type != STACK_TYPE_UNKNOWN &&
42 addr >= begin && addr < end &&
43 addr + len > begin && addr + len <= end);
44 }
45
46 extern int kstack_depth_to_print;
47
48 #ifdef CONFIG_X86_32
49 #define STACKSLOTS_PER_LINE 8
50 #else
51 #define STACKSLOTS_PER_LINE 4
52 #endif
53
54 #ifdef CONFIG_FRAME_POINTER
55 static inline unsigned long *
get_frame_pointer(struct task_struct * task,struct pt_regs * regs)56 get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
57 {
58 if (regs)
59 return (unsigned long *)regs->bp;
60
61 if (task == current)
62 return __builtin_frame_address(0);
63
64 return (unsigned long *)((struct inactive_task_frame *)task->thread.sp)->bp;
65 }
66 #else
67 static inline unsigned long *
get_frame_pointer(struct task_struct * task,struct pt_regs * regs)68 get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
69 {
70 return NULL;
71 }
72 #endif /* CONFIG_FRAME_POINTER */
73
74 static inline unsigned long *
get_stack_pointer(struct task_struct * task,struct pt_regs * regs)75 get_stack_pointer(struct task_struct *task, struct pt_regs *regs)
76 {
77 if (regs)
78 return (unsigned long *)kernel_stack_pointer(regs);
79
80 if (task == current)
81 return __builtin_frame_address(0);
82
83 return (unsigned long *)task->thread.sp;
84 }
85
86 void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
87 unsigned long *stack, char *log_lvl);
88
89 void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
90 unsigned long *sp, 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 frame = __builtin_frame_address(0);
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