diff --git a/c-print-for-loop/main.c b/c-print-for-loop/main.c
index 83412a9..0f883f0 100644
--- a/c-print-for-loop/main.c
+++ b/c-print-for-loop/main.c
@@ -5,6 +5,7 @@ void _start(void)
 {
 	asm ("law 04000");
 	asm ("dac 209");
+	asm ("law 03000");
 	asm ("dac 208");
 
 	int c;
diff --git a/c-test-recursion/Makefile b/c-test-recursion/Makefile
new file mode 100644
index 0000000..49d1aab
--- /dev/null
+++ b/c-test-recursion/Makefile
@@ -0,0 +1 @@
+include ../common/common.mk
diff --git a/c-test-recursion/main.c b/c-test-recursion/main.c
new file mode 100644
index 0000000..73ab9ab
--- /dev/null
+++ b/c-test-recursion/main.c
@@ -0,0 +1,30 @@
+static void putc();
+
+static void foo(int);
+
+void _start(void)
+{
+	/* TODO: handle sp/fp init better -- separate crt0.S? */
+	asm ("law 03000");
+	asm ("dac 209");
+	asm ("law 04000");
+	asm ("dac 208");
+
+	foo(20);
+
+	asm ("hlt");
+	__builtin_unreachable();
+}
+
+static void putc() {
+	asm ("lio %0" :  : "r"(027) : "io");
+	asm ("tyo");
+}
+
+static void foo(int n)
+{
+	if (n != 0) {
+		putc();
+		foo(n - 1);
+	}
+}
diff --git a/pdp1-gcc b/pdp1-gcc
index 53bbfaf..2804d4a 160000
--- a/pdp1-gcc
+++ b/pdp1-gcc
@@ -1 +1 @@
-Subproject commit 53bbfaff2662ac019da34bebc11b781bdf8c9722
+Subproject commit 2804d4aff1325f86a6967f91e9b8c9da76cea0db