xref: /openbmc/linux/arch/sh/kernel/perf_callchain.c (revision 1ab142d4)
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 
17 static int callchain_stack(void *data, char *name)
18 {
19 	return 0;
20 }
21 
22 static 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 
30 static const struct stacktrace_ops callchain_ops = {
31 	.stack		= callchain_stack,
32 	.address	= callchain_address,
33 };
34 
35 void
36 perf_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