Add support for building test case ROMs with vasm.

While here add first such ROM, for nop instruction test.

test/Makefile

@@ -1,15 +1,22 @@
 CFLAGS=-Wall -I../src -g
 LDFLAGS=-latf-c 
 RK6502LIB=../src/librk65c02.a
+VASM=vasm6502_std
+VASMFLAGS=-Fbin -c02
+
 TESTS=test_bus test_emulation
+TESTROMS=test_emulation_nop.rom
 
-all : $(TESTS) 
+all : $(TESTS) $(TESTROMS)
 
-test_bus : test_bus.o 
-	$(CC) -o test_bus $(LDFLAGS) $< $(RK6502LIB)
+test_bus : test_bus.o $(RK6502LIB)
+	$(CC) -o $@ $(LDFLAGS) $< $(RK6502LIB)
 
-test_emulation : test_emulation.o
-	$(CC) -o test_emulation $(LDFLAGS) $< $(RK6502LIB)
+test_emulation : test_emulation.o $(RK6502LIB)
+	$(CC) -o $@ $(LDFLAGS) $< $(RK6502LIB)
+
+%.rom : %.s
+	$(VASM) $(VASMFLAGS) -o $@ $< 
 
 %.o : %.c
 	$(CC) $(CFLAGS) -c $< 
@@ -17,4 +24,5 @@ test_emulation : test_emulation.o
 clean :
 	rm -f *.o
 	rm -f $(TESTS)
+	rm -f $(TESTROMS)
 

test/test_emulation_nop.s

@@ -0,0 +1,3 @@
+start:	nop
+	stp
+