diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000..96a5ff99b5
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tools/asm-processor"]
+	path = tools/asm-processor
+	url = https://github.com/simonlindholm/asm-processor.git
diff --git a/tools/asm-processor b/tools/asm-processor
new file mode 160000
index 0000000000..a2877f3268
--- /dev/null
+++ b/tools/asm-processor
@@ -0,0 +1 @@
+Subproject commit a2877f3268b0cd4a4b41c3f7def456493144f444