1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Performance event callchain support - SuperH architecture code
4 *
5 * Copyright (C) 2009 Paul Mundt
6 */
7 #include <linux/kernel.h>
8 #include <linux/sched.h>
9 #include <linux/perf_event.h>
10 #include <linux/percpu.h>
11 #include <asm/unwinder.h>
12 #include <asm/ptrace.h>
13
callchain_address(void * data,unsigned long addr,int reliable)14 static void callchain_address(void *data, unsigned long addr, int reliable)
15 {
16 struct perf_callchain_entry_ctx *entry = data;
17
18 if (reliable)
19 perf_callchain_store(entry, addr);
20 }
21
22 static const struct stacktrace_ops callchain_ops = {
23 .address = callchain_address,
24 };
25
26 void
perf_callchain_kernel(struct perf_callchain_entry_ctx * entry,struct pt_regs * regs)27 perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
28 {
29 perf_callchain_store(entry, regs->pc);
30
31 unwind_stack(NULL, regs, NULL, &callchain_ops, entry);
32 }
33