diff --git a/Core/_Core.h b/Core/_Core.h
index 3ce4fc88..1e0b59c2 100644
--- a/Core/_Core.h
+++ b/Core/_Core.h
@@ -6,7 +6,8 @@
 extern "C"
 {
 #if defined(DEBUG)
-	#define debug_printf printf
+	#define debug_printf SmartOS_printf
+	extern int SmartOS_printf(const char *format, ...);
 #else
 	#define debug_printf(format, ...)
 #endif
diff --git a/Kernel/Sys.h b/Kernel/Sys.h
index 1fe0db27..3c457dee 100644
--- a/Kernel/Sys.h
+++ b/Kernel/Sys.h
@@ -26,7 +26,8 @@
 extern "C"
 {
 #if defined(DEBUG)
-	#define debug_printf printf
+	#define debug_printf SmartOS_printf
+	extern int SmartOS_printf(const char *format, ...);
 #else
 	#define debug_printf(format, ...)
 #endif
diff --git a/Platform/CortexM/Sys.cpp b/Platform/CortexM/Sys.cpp
index 6c46bed3..5f18df1c 100644
--- a/Platform/CortexM/Sys.cpp
+++ b/Platform/CortexM/Sys.cpp
@@ -371,3 +371,16 @@ void ExitCritical()		{ __enable_irq(); }
 
 uint	_REV(uint value)		{ return __REV(value); }
 ushort	_REV16(ushort value)	{ return __REV16(value); }
+
+/******************************** 调试日志 ********************************/
+
+int SmartOS_printf(const char* format, ...)
+{
+	va_list ap;
+
+	va_start(ap, format);
+	int rs	= printf(format, ap);
+	va_end(ap);
+
+	return rs;
+}