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/blackfin/include/asm/ftrace.h | 73 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 arch/blackfin/include/asm/ftrace.h

(limited to 'arch/blackfin/include/asm/ftrace.h')

diff --git a/arch/blackfin/include/asm/ftrace.h b/arch/blackfin/include/asm/ftrace.h
new file mode 100644
index 00000000..2f1c3c26
--- /dev/null
+++ b/arch/blackfin/include/asm/ftrace.h
@@ -0,0 +1,73 @@
+/*
+ * Blackfin ftrace code
+ *
+ * Copyright 2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __ASM_BFIN_FTRACE_H__
+#define __ASM_BFIN_FTRACE_H__
+
+#define MCOUNT_INSN_SIZE	6 /* sizeof "[++sp] = rets; call __mcount;" */
+
+#ifndef __ASSEMBLY__
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+
+extern void _mcount(void);
+#define MCOUNT_ADDR ((unsigned long)_mcount)
+
+static inline unsigned long ftrace_call_adjust(unsigned long addr)
+{
+	return addr;
+}
+
+struct dyn_arch_ftrace {
+	/* No extra data needed for Blackfin */
+};
+
+#endif
+
+#ifdef CONFIG_FRAME_POINTER
+#include <linux/mm.h>
+
+extern inline void *return_address(unsigned int level)
+{
+	unsigned long *endstack, *fp, *ret_addr;
+	unsigned int current_level = 0;
+
+	if (level == 0)
+		return __builtin_return_address(0);
+
+	fp = (unsigned long *)__builtin_frame_address(0);
+	endstack = (unsigned long *)PAGE_ALIGN((unsigned long)&level);
+
+	while (((unsigned long)fp & 0x3) == 0 && fp &&
+	       (fp + 1) < endstack && current_level < level) {
+		fp = (unsigned long *)*fp;
+		current_level++;
+	}
+
+	if (((unsigned long)fp & 0x3) == 0 && fp &&
+	    (fp + 1) < endstack)
+		ret_addr = (unsigned long *)*(fp + 1);
+	else
+		ret_addr = NULL;
+
+	return ret_addr;
+}
+
+#else
+
+extern inline void *return_address(unsigned int level)
+{
+	return NULL;
+}
+
+#endif /* CONFIG_FRAME_POINTER */
+
+#define ftrace_return_address(n) return_address(n)
+
+#endif /* __ASSEMBLY__ */
+
+#endif
-- 
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