Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
[pandora-kernel.git] / arch / sh / kernel / perf_callchain.c
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 }