From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 arch/sh/kernel/perf_callchain.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 arch/sh/kernel/perf_callchain.c

(limited to 'arch/sh/kernel/perf_callchain.c')

diff --git a/arch/sh/kernel/perf_callchain.c b/arch/sh/kernel/perf_callchain.c
new file mode 100644
index 00000000..cc80b614
--- /dev/null
+++ b/arch/sh/kernel/perf_callchain.c
@@ -0,0 +1,41 @@
+/*
+ * Performance event callchain support - SuperH architecture code
+ *
+ * Copyright (C) 2009  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/perf_event.h>
+#include <linux/percpu.h>
+#include <asm/unwinder.h>
+#include <asm/ptrace.h>
+
+static int callchain_stack(void *data, char *name)
+{
+	return 0;
+}
+
+static void callchain_address(void *data, unsigned long addr, int reliable)
+{
+	struct perf_callchain_entry *entry = data;
+
+	if (reliable)
+		perf_callchain_store(entry, addr);
+}
+
+static const struct stacktrace_ops callchain_ops = {
+	.stack		= callchain_stack,
+	.address	= callchain_address,
+};
+
+void
+perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
+{
+	perf_callchain_store(entry, regs->pc);
+
+	unwind_stack(NULL, regs, NULL, &callchain_ops, entry);
+}
-- 
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