1/*
2 * Performance event callchain support - SuperH architecture code
3 *
4 * Copyright (C) 2009  Paul Mundt
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License.  See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <linux/perf_event.h>
13#include <linux/percpu.h>
14#include <asm/unwinder.h>
15#include <asm/ptrace.h>
16
17static int callchain_stack(void *data, char *name)
18{
19	return 0;
20}
21
22static void callchain_address(void *data, unsigned long addr, int reliable)
23{
24	struct perf_callchain_entry *entry = data;
25
26	if (reliable)
27		perf_callchain_store(entry, addr);
28}
29
30static const struct stacktrace_ops callchain_ops = {
31	.stack		= callchain_stack,
32	.address	= callchain_address,
33};
34
35void
36perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
37{
38	perf_callchain_store(entry, regs->pc);
39
40	unwind_stack(NULL, regs, NULL, &callchain_ops, entry);
41}
42