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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
16enum 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
26struct stack_info {
27 enum stack_type type;
28 unsigned long *begin, *end, *next_sp;
29};
30
31bool in_task_stack(unsigned long *stack, struct task_struct *task,
32 struct stack_info *info);
33
34bool in_entry_stack(unsigned long *stack, struct stack_info *info);
35
36int get_stack_info(unsigned long *stack, struct task_struct *task,
37 struct stack_info *info, unsigned long *visit_mask);
38bool get_stack_info_noinstr(unsigned long *stack, struct task_struct *task,
39 struct stack_info *info);
40
41static __always_inline
42bool get_stack_guard_info(unsigned long *stack, struct stack_info *info)
43{
44 /* make sure it's not in the stack proper */
45 if (get_stack_info_noinstr(stack, current, info))
46 return false;
47 /* but if it is in the page below it, we hit a guard */
48 return get_stack_info_noinstr((void *)stack + PAGE_SIZE, current, info);
49}
50
51const char *stack_type_name(enum stack_type type);
52
53static inline bool on_stack(struct stack_info *info, void *addr, size_t len)
54{
55 void *begin = info->begin;
56 void *end = info->end;
57
58 return (info->type != STACK_TYPE_UNKNOWN &&
59 addr >= begin && addr < end &&
60 addr + len > begin && addr + len <= end);
61}
62
63#ifdef CONFIG_X86_32
64#define STACKSLOTS_PER_LINE 8
65#else
66#define STACKSLOTS_PER_LINE 4
67#endif
68
69#ifdef CONFIG_FRAME_POINTER
70static inline unsigned long *
71get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
72{
73 if (regs)
74 return (unsigned long *)regs->bp;
75
76 if (task == current)
77 return __builtin_frame_address(0);
78
79 return &((struct inactive_task_frame *)task->thread.sp)->bp;
80}
81#else
82static inline unsigned long *
83get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
84{
85 return NULL;
86}
87#endif /* CONFIG_FRAME_POINTER */
88
89static inline unsigned long *
90get_stack_pointer(struct task_struct *task, struct pt_regs *regs)
91{
92 if (regs)
93 return (unsigned long *)regs->sp;
94
95 if (task == current)
96 return __builtin_frame_address(0);
97
98 return (unsigned long *)task->thread.sp;
99}
100
101/* The form of the top of the frame on the stack */
102struct stack_frame {
103 struct stack_frame *next_frame;
104 unsigned long return_address;
105};
106
107struct stack_frame_ia32 {
108 u32 next_frame;
109 u32 return_address;
110};
111
112void show_opcodes(struct pt_regs *regs, const char *loglvl);
113void show_ip(struct pt_regs *regs, const char *loglvl);
114#endif /* _ASM_X86_STACKTRACE_H */
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 */