xtensa: add static function tracer support

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>

1 files changed, 15 insertions, 2 deletions

diff --git a/arch/xtensa/include/asm/ftrace.h b/arch/xtensa/include/asm/ftrace.h
index 36dc7a684397..73cc3f482304 100644
--- a/arch/xtensa/include/asm/ftrace.h
+++ b/arch/xtensa/include/asm/ftrace.h
@@ -13,6 +13,7 @@
 #include <asm/processor.h>
 
 #define HAVE_ARCH_CALLER_ADDR
+#ifndef __ASSEMBLY__
 #define CALLER_ADDR0 ({ unsigned long a0, a1; \
                 __asm__ __volatile__ ( \
                         "mov %0, a0\n" \
@@ -24,10 +25,22 @@ extern unsigned long return_address(unsigned level);
 #define CALLER_ADDR1 return_address(1)
 #define CALLER_ADDR2 return_address(2)
 #define CALLER_ADDR3 return_address(3)
-#else
+#else /* CONFIG_FRAME_POINTER */
 #define CALLER_ADDR1 (0)
 #define CALLER_ADDR2 (0)
 #define CALLER_ADDR3 (0)
-#endif
+#endif /* CONFIG_FRAME_POINTER */
+#endif /* __ASSEMBLY__ */
+
+#ifdef CONFIG_FUNCTION_TRACER
+
+#define MCOUNT_ADDR ((unsigned long)(_mcount))
+#define MCOUNT_INSN_SIZE 3
+
+#ifndef __ASSEMBLY__
+extern void _mcount(void);
+#define mcount _mcount
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_FUNCTION_TRACER */
 
 #endif /* _XTENSA_FTRACE_H */