Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include <linux/sched.h>
2#include <linux/stacktrace.h>
3#include <linux/stacktrace.h>
4#include <asm/stacktrace.h>
5
6void walk_stackframe(unsigned long sp,
7 int (*fn)(unsigned long addr, void *data),
8 void *data)
9{
10 unsigned long high = ALIGN(sp, THREAD_SIZE);
11
12 for (; sp <= high - 4; sp += 4) {
13 unsigned long addr = *(unsigned long *) sp;
14
15 if (!kernel_text_address(addr))
16 continue;
17
18 if (fn(addr, data))
19 break;
20 }
21}
22
23struct stack_trace_data {
24 struct stack_trace *trace;
25 unsigned int no_sched_functions;
26 unsigned int skip;
27};
28
29#ifdef CONFIG_STACKTRACE
30
31static int save_trace(unsigned long addr, void *d)
32{
33 struct stack_trace_data *data = d;
34 struct stack_trace *trace = data->trace;
35
36 if (data->no_sched_functions && in_sched_functions(addr))
37 return 0;
38
39 if (data->skip) {
40 data->skip--;
41 return 0;
42 }
43
44 trace->entries[trace->nr_entries++] = addr;
45
46 return trace->nr_entries >= trace->max_entries;
47}
48
49void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
50{
51 struct stack_trace_data data;
52 unsigned long sp;
53
54 data.trace = trace;
55 data.skip = trace->skip;
56
57 if (tsk != current) {
58 data.no_sched_functions = 1;
59 sp = tsk->thread.ksp;
60 } else {
61 data.no_sched_functions = 0;
62 sp = rdsp();
63 }
64
65 walk_stackframe(sp, save_trace, &data);
66 if (trace->nr_entries < trace->max_entries)
67 trace->entries[trace->nr_entries++] = ULONG_MAX;
68}
69
70void save_stack_trace(struct stack_trace *trace)
71{
72 save_stack_trace_tsk(current, trace);
73}
74EXPORT_SYMBOL_GPL(save_stack_trace);
75
76#endif /* CONFIG_STACKTRACE */