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#include <asm/switch_to.h>
13
14enum stack_type {
15 STACK_TYPE_UNKNOWN,
16 STACK_TYPE_TASK,
17 STACK_TYPE_IRQ,
18 STACK_TYPE_SOFTIRQ,
19 STACK_TYPE_ENTRY,
20 STACK_TYPE_EXCEPTION,
21 STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1,
22};
23
24struct stack_info {
25 enum stack_type type;
26 unsigned long *begin, *end, *next_sp;
27};
28
29bool in_task_stack(unsigned long *stack, struct task_struct *task,
30 struct stack_info *info);
31
32bool in_entry_stack(unsigned long *stack, struct stack_info *info);
33
34int get_stack_info(unsigned long *stack, struct task_struct *task,
35 struct stack_info *info, unsigned long *visit_mask);
36
37const char *stack_type_name(enum stack_type type);
38
39static inline bool on_stack(struct stack_info *info, void *addr, size_t len)
40{
41 void *begin = info->begin;
42 void *end = info->end;
43
44 return (info->type != STACK_TYPE_UNKNOWN &&
45 addr >= begin && addr < end &&
46 addr + len > begin && addr + len <= end);
47}
48
49#ifdef CONFIG_X86_32
50#define STACKSLOTS_PER_LINE 8
51#else
52#define STACKSLOTS_PER_LINE 4
53#endif
54
55#ifdef CONFIG_FRAME_POINTER
56static inline unsigned long *
57get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
58{
59 if (regs)
60 return (unsigned long *)regs->bp;
61
62 if (task == current)
63 return __builtin_frame_address(0);
64
65 return &((struct inactive_task_frame *)task->thread.sp)->bp;
66}
67#else
68static inline unsigned long *
69get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
70{
71 return NULL;
72}
73#endif /* CONFIG_FRAME_POINTER */
74
75static inline unsigned long *
76get_stack_pointer(struct task_struct *task, struct pt_regs *regs)
77{
78 if (regs)
79 return (unsigned long *)kernel_stack_pointer(regs);
80
81 if (task == current)
82 return __builtin_frame_address(0);
83
84 return (unsigned long *)task->thread.sp;
85}
86
87void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
88 unsigned long *stack, char *log_lvl);
89
90/* The form of the top of the frame on the stack */
91struct stack_frame {
92 struct stack_frame *next_frame;
93 unsigned long return_address;
94};
95
96struct stack_frame_ia32 {
97 u32 next_frame;
98 u32 return_address;
99};
100
101static inline unsigned long caller_frame_pointer(void)
102{
103 struct stack_frame *frame;
104
105 frame = __builtin_frame_address(0);
106
107#ifdef CONFIG_FRAME_POINTER
108 frame = frame->next_frame;
109#endif
110
111 return (unsigned long)frame;
112}
113
114void show_opcodes(struct pt_regs *regs, const char *loglvl);
115void show_ip(struct pt_regs *regs, const char *loglvl);
116#endif /* _ASM_X86_STACKTRACE_H */
117