1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  *  Copyright (C) 1991, 1992  Linus Torvalds
4  *  Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
5  */
6 
7 #ifndef _ASM_X86_STACKTRACE_H
8 #define _ASM_X86_STACKTRACE_H
9 
10 #include <linux/uaccess.h>
11 #include <linux/ptrace.h>
12 
13 #include <asm/cpu_entry_area.h>
14 #include <asm/switch_to.h>
15 
16 enum stack_type {
17 	STACK_TYPE_UNKNOWN,
18 	STACK_TYPE_TASK,
19 	STACK_TYPE_IRQ,
20 	STACK_TYPE_SOFTIRQ,
21 	STACK_TYPE_ENTRY,
22 	STACK_TYPE_EXCEPTION,
23 	STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1,
24 };
25 
26 struct stack_info {
27 	enum stack_type type;
28 	unsigned long *begin, *end, *next_sp;
29 };
30 
31 bool in_task_stack(unsigned long *stack, struct task_struct *task,
32 		   struct stack_info *info);
33 
34 bool in_entry_stack(unsigned long *stack, struct stack_info *info);
35 
36 int get_stack_info(unsigned long *stack, struct task_struct *task,
37 		   struct stack_info *info, unsigned long *visit_mask);
38 bool get_stack_info_noinstr(unsigned long *stack, struct task_struct *task,
39 			    struct stack_info *info);
40 
41 const char *stack_type_name(enum stack_type type);
42 
on_stack(struct stack_info * info,void * addr,size_t len)43 static inline bool on_stack(struct stack_info *info, void *addr, size_t len)
44 {
45 	void *begin = info->begin;
46 	void *end   = info->end;
47 
48 	return (info->type != STACK_TYPE_UNKNOWN &&
49 		addr >= begin && addr < end &&
50 		addr + len > begin && addr + len <= end);
51 }
52 
53 #ifdef CONFIG_X86_32
54 #define STACKSLOTS_PER_LINE 8
55 #else
56 #define STACKSLOTS_PER_LINE 4
57 #endif
58 
59 #ifdef CONFIG_FRAME_POINTER
60 static inline unsigned long *
get_frame_pointer(struct task_struct * task,struct pt_regs * regs)61 get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
62 {
63 	if (regs)
64 		return (unsigned long *)regs->bp;
65 
66 	if (task == current)
67 		return __builtin_frame_address(0);
68 
69 	return &((struct inactive_task_frame *)task->thread.sp)->bp;
70 }
71 #else
72 static inline unsigned long *
get_frame_pointer(struct task_struct * task,struct pt_regs * regs)73 get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
74 {
75 	return NULL;
76 }
77 #endif /* CONFIG_FRAME_POINTER */
78 
79 static inline unsigned long *
get_stack_pointer(struct task_struct * task,struct pt_regs * regs)80 get_stack_pointer(struct task_struct *task, struct pt_regs *regs)
81 {
82 	if (regs)
83 		return (unsigned long *)regs->sp;
84 
85 	if (task == current)
86 		return __builtin_frame_address(0);
87 
88 	return (unsigned long *)task->thread.sp;
89 }
90 
91 void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
92 			unsigned long *stack, const char *log_lvl);
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 
105 void show_opcodes(struct pt_regs *regs, const char *loglvl);
106 void show_ip(struct pt_regs *regs, const char *loglvl);
107 #endif /* _ASM_X86_STACKTRACE_H */
108