diff --git a/bsp/abstract-machine/Makefile b/bsp/abstract-machine/Makefile
index 8ecdb37..9818028 100644
--- a/bsp/abstract-machine/Makefile
+++ b/bsp/abstract-machine/Makefile
@@ -4,7 +4,7 @@ FILE_TMP = .tmp.$(FILE_MK)
 RTCONFIG_H = rtconfig.h
 
 NAME = rtthread
-SRCS = 
+SRCS = $(shell find src -name "*.c")
 CFLAGS += -DHAVE_CCONFIG_H -D__RTTHREAD__
 -include $(FILE_MK)
 include $(AM_HOME)/Makefile
diff --git a/bsp/abstract-machine/src/init.c b/bsp/abstract-machine/src/init.c
new file mode 100644
index 0000000..7742a96
--- /dev/null
+++ b/bsp/abstract-machine/src/init.c
@@ -0,0 +1,5 @@
+int main() {
+  extern int entry(void);
+  entry();
+  return 0;
+}