1/*
2 * arch/x86_64/kernel/stacktrace.c
3 *
4 * Stack trace management functions
5 *
6 *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
7 */
8#include <linux/sched.h>
9#include <linux/stacktrace.h>
10#include <linux/module.h>
11#include <asm/stacktrace.h>
12
13static void save_stack_warning(void *data, char *msg)
14{
15}
16
17static void
18save_stack_warning_symbol(void *data, char *msg, unsigned long symbol)
19{
20}
21
22static int save_stack_stack(void *data, char *name)
23{
24	return -1;
25}
26
27static void save_stack_address(void *data, unsigned long addr)
28{
29	struct stack_trace *trace = (struct stack_trace *)data;
30	if (trace->skip > 0) {
31		trace->skip--;
32		return;
33	}
34	if (trace->nr_entries < trace->max_entries)
35		trace->entries[trace->nr_entries++] = addr;
36}
37
38static struct stacktrace_ops save_stack_ops = {
39	.warning = save_stack_warning,
40	.warning_symbol = save_stack_warning_symbol,
41	.stack = save_stack_stack,
42	.address = save_stack_address,
43};
44
45/*
46 * Save stack-backtrace addresses into a stack_trace buffer.
47 */
48void save_stack_trace(struct stack_trace *trace)
49{
50	dump_trace(current, NULL, NULL, &save_stack_ops, trace);
51	if (trace->nr_entries < trace->max_entries)
52		trace->entries[trace->nr_entries++] = ULONG_MAX;
53}
54EXPORT_SYMBOL(save_stack_trace);
55