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
|
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/stacktrace.h>
#include "stacktrace.h"
int walk_stackframe(unsigned long fp, unsigned long low, unsigned long high,
int (*fn)(struct stackframe *, void *), void *data)
{
struct stackframe *frame;
do {
/*
* Check current frame pointer is within bounds
*/
if (fp < (low + 12) || fp + 4 >= high)
break;
frame = (struct stackframe *)(fp - 12);
if (fn(frame, data))
break;
/*
* Update the low bound - the next frame must always
* be at a higher address than the current frame.
*/
low = fp + 4;
fp = frame->fp;
} while (fp);
return 0;
}
EXPORT_SYMBOL(walk_stackframe);
#ifdef CONFIG_STACKTRACE
struct stack_trace_data {
struct stack_trace *trace;
unsigned int skip;
};
static int save_trace(struct stackframe *frame, void *d)
{
struct stack_trace_data *data = d;
struct stack_trace *trace = data->trace;
if (data->skip) {
data->skip--;
return 0;
}
trace->entries[trace->nr_entries++] = frame->lr;
return trace->nr_entries >= trace->max_entries;
}
void save_stack_trace(struct stack_trace *trace)
{
struct stack_trace_data data;
unsigned long fp, base;
data.trace = trace;
data.skip = trace->skip;
base = (unsigned long)task_stack_page(current);
asm("mov %0, fp" : "=r" (fp));
walk_stackframe(fp, base, base + THREAD_SIZE, save_trace, &data);
}
EXPORT_SYMBOL_GPL(save_stack_trace);
#endif
|
