1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
* Copyright (C) 2009 Matt Fleming
* Copyright (C) 2002 - 2012 Paul Mundt
*/
#include <linux/kallsyms.h>
#include <linux/ftrace.h>
#include <linux/debug_locks.h>
#include <linux/sched/debug.h>
#include <linux/sched/task_stack.h>
#include <linux/kdebug.h>
#include <linux/export.h>
#include <linux/uaccess.h>
#include <asm/unwinder.h>
#include <asm/stacktrace.h>
void dump_mem(const char *str, const char *loglvl,
unsigned long bottom, unsigned long top)
{
unsigned long p;
int i;
printk("%s%s(0x%08lx to 0x%08lx)\n", loglvl, str, bottom, top);
for (p = bottom & ~31; p < top; ) {
printk("%s%04lx: ", loglvl, p & 0xffff);
for (i = 0; i < 8; i++, p += 4) {
unsigned int val;
if (p < bottom || p >= top)
printk("%s ", loglvl);
else {
if (__get_user(val, (unsigned int __user *)p)) {
printk("%s\n", loglvl);
return;
}
printk("%s%08x ", loglvl, val);
}
}
printk("%s\n", loglvl);
}
}
void printk_address(unsigned long address, int reliable, const char *loglvl)
{
printk("%s [<%p>] %s%pS\n", loglvl, (void *) address,
reliable ? "" : "? ", (void *) address);
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static void
print_ftrace_graph_addr(unsigned long addr, void *data,
const struct stacktrace_ops *ops,
struct thread_info *tinfo, int *graph)
{
struct task_struct *task = tinfo->task;
struct ftrace_ret_stack *ret_stack;
unsigned long ret_addr;
if (addr != (unsigned long)return_to_handler)
return;
if (!task->ret_stack)
return;
ret_stack = ftrace_graph_get_ret_stack(task, *graph);
if (!ret_stack)
return;
ret_addr = ret_stack->ret;
ops->address(data, ret_addr, 1);
(*graph)++;
}
#else
static inline void
print_ftrace_graph_addr(unsigned long addr, void *data,
const struct stacktrace_ops *ops,
struct thread_info *tinfo, int *graph)
{ }
#endif
void
stack_reader_dump(struct task_struct *task, struct pt_regs *regs,
unsigned long *sp, const struct stacktrace_ops *ops,
void *data)
{
struct thread_info *context;
int graph = 0;
context = (struct thread_info *)
((unsigned long)sp & (~(THREAD_SIZE - 1)));
while (!kstack_end(sp)) {
unsigned long addr = *sp++;
if (__kernel_text_address(addr)) {
ops->address(data, addr, 1);
print_ftrace_graph_addr(addr, data, ops,
context, &graph);
}
}
}
static int print_trace_stack(void *data, char *name)
{
printk("%s <%s> ", (char *)data, name);
return 0;
}
/*
* Print one address/symbol entries per line.
*/
static void print_trace_address(void *data, unsigned long addr, int reliable)
{
printk_address(addr, reliable, (char *)data);
}
static const struct stacktrace_ops print_trace_ops = {
.stack = print_trace_stack,
.address = print_trace_address,
};
void show_trace(struct task_struct *tsk, unsigned long *sp,
struct pt_regs *regs, const char *loglvl)
{
if (regs && user_mode(regs))
return;
printk("%s\nCall trace:\n", loglvl);
unwind_stack(tsk, regs, sp, &print_trace_ops, (void *)loglvl);
printk("%s\n", loglvl);
if (!tsk)
tsk = current;
debug_show_held_locks(tsk);
}
void show_stack(struct task_struct *tsk, unsigned long *sp, const char *loglvl)
{
unsigned long stack;
if (!tsk)
tsk = current;
if (tsk == current)
sp = (unsigned long *)current_stack_pointer;
else
sp = (unsigned long *)tsk->thread.sp;
stack = (unsigned long)sp;
dump_mem("Stack: ", loglvl, stack, THREAD_SIZE +
(unsigned long)task_stack_page(tsk));
show_trace(tsk, sp, NULL, loglvl);
}
|
