Makefile fixes

test/syscall_tests/Makefile

@@ -0,0 +1,16 @@
+
+PROGRAMS = halt prints
+
+build: $(PROGRAMS)
+
+dumps: halt.dump prints.dump
+
+tests: halt.guac prints.guac
+
+clean:
+	$(RM) halt.o halt prints prints.o 
+
+TOPDIR = ../..
+include $(TOPDIR)/Makefile.rules
+
+$(PROGRAMS): % : $(USERLIB)/sys.o $(USERLIB)/libnachos.o %.o

test/syscall_tests/halt.c

@@ -0,0 +1,7 @@
+
+#include "userlib/syscall.h"
+
+int main() {
+    Shutdown();
+    return 0;
+}

test/syscall_tests/prints.c

@@ -0,0 +1,10 @@
+#include "userlib/syscall.h"
+#include "userlib/libnachos.h"
+
+int main() {
+    n_printf("Hello World 1");
+    n_printf("Hello World 2");
+    n_printf("Hello World 3");
+    n_printf("Hello World 4");
+    return 0;
+}