1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * S390 Version
 4 *   Copyright IBM Corp. 2002, 2011
 5 *   Author(s): Thomas Spatzier (tspat@de.ibm.com)
 6 *   Author(s): Mahesh Salgaonkar (mahesh@linux.vnet.ibm.com)
 7 *   Author(s): Heinz Graalfs (graalfs@linux.vnet.ibm.com)
 8 *   Author(s): Andreas Krebbel (krebbel@linux.vnet.ibm.com)
 9 *
10 * @remark Copyright 2002-2011 OProfile authors
11 */
12
13#include <linux/oprofile.h>
14#include <linux/init.h>
15#include <asm/processor.h>
16#include <asm/unwind.h>
17
18static void s390_backtrace(struct pt_regs *regs, unsigned int depth)
19{
20	struct unwind_state state;
21
22	unwind_for_each_frame(&state, current, regs, 0) {
23		if (depth-- == 0)
24			break;
25		oprofile_add_trace(state.ip);
26	}
27}
28
29int __init oprofile_arch_init(struct oprofile_operations *ops)
30{
31	ops->backtrace = s390_backtrace;
32	return 0;
33}
34
35void oprofile_arch_exit(void)
36{
37}