实验2环境初始化

labcodes_answer/lab2_result/Makefile

@@ -202,7 +202,7 @@ endif
 # files for grade script
 
 targets: $(TARGETS)
-
+all: $(TARGETS)
 .DEFAULT_GOAL := targets
 
 QEMUOPTS = -hda $(UCOREIMG)
@@ -217,7 +217,8 @@ qemu-nox: targets
 	$(V)$(QEMU) -serial mon:stdio $(QEMUOPTS) -nographic
 
 TERMINAL := gnome-terminal
-
+gdb: $(UCOREIMG)
+	$(V)$(QEMU) -S -s -parallel stdio -hda $< -serial null
 debug: $(UCOREIMG)
 	$(V)$(QEMU) -S -s -parallel stdio $(QEMUOPTS) -serial null &
 	$(V)sleep 2