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
17static int __s390_backtrace(void *data, unsigned long address, int reliable)
18{
19	unsigned int *depth = data;
20
21	if (*depth == 0)
22		return 1;
23	(*depth)--;
24	oprofile_add_trace(address);
25	return 0;
26}
27
28static void s390_backtrace(struct pt_regs *regs, unsigned int depth)
29{
30	if (user_mode(regs))
31		return;
32	dump_trace(__s390_backtrace, &depth, NULL, regs->gprs[15]);
33}
34
35int __init oprofile_arch_init(struct oprofile_operations *ops)
36{
37	ops->backtrace = s390_backtrace;
38	return 0;
39}
40
41void oprofile_arch_exit(void)
42{
43}