diff --git a/Makefile b/Makefile
index a9ae723fa..ad65867f0 100644
--- a/Makefile
+++ b/Makefile
@@ -20,22 +20,22 @@ endif
 
 -include $(NEMU_HOME)/include/config/auto.conf
 -include $(NEMU_HOME)/include/config/auto.conf.cmd
+include $(NEMU_HOME)/scripts/utils.mk
 
-DIRS-y = src/cpu src/monitor src/utils
-DIRS-$(CONFIG_MODE_SYSTEM) += src/memory
+ENGINE ?= $(call remove_quote,$(CONFIG_ENGINE))
+INC_DIR += $(NEMU_HOME)/src/engine/$(ENGINE)
+DIRS-y = src/engine/$(ENGINE)
+NAME = nemu-$(ENGINE)
 
-remove_quote = $(patsubst "%",%,$(1))
+include $(NEMU_HOME)/scripts/isa.mk
+
+DIRS-y += src/cpu src/monitor src/utils
+DIRS-$(CONFIG_MODE_SYSTEM) += src/memory
 
-ISA    ?= $(if $(CONFIG_ISA),$(call remove_quote,$(CONFIG_ISA)),x86)
-CFLAGS += -D__ISA__=$(ISA)
 # CFLAGS += -g
 INC_DIR += $(NEMU_HOME)/src/isa/$(ISA)/include
 DIRS-y += src/isa/$(ISA)
 
-ENGINE ?= $(call remove_quote,$(CONFIG_ENGINE))
-INC_DIR += $(NEMU_HOME)/src/engine/$(ENGINE)
-DIRS-y += src/engine/$(ENGINE)
-
 DIRS-$(CONFIG_MODE_USER) += src/user
 
 SRCS-y += src/nemu-main.c
@@ -83,8 +83,6 @@ CFLAGS_BUILD += $(if $(CONFIG_CC_ASAN),-fsanitize=address,)
 CFLAGS  += $(CFLAGS_BUILD)
 LDFLAGS += $(CFLAGS_BUILD)
 
-NAME  = nemu-$(ENGINE)
-
 ifndef CONFIG_SHARE
 ifdef CONFIG_CC_NATIVE_ARCH
 CFLAGS  += -march=native
@@ -142,7 +140,6 @@ endif
 
 include $(NEMU_HOME)/scripts/git.mk
 include $(NEMU_HOME)/scripts/config.mk
-include $(NEMU_HOME)/scripts/isa.mk
 include $(NEMU_HOME)/scripts/build.mk
 
 ifdef CONFIG_DIFFTEST
diff --git a/scripts/isa.mk b/scripts/isa.mk
index f8d669f93..6334f261b 100644
--- a/scripts/isa.mk
+++ b/scripts/isa.mk
@@ -13,10 +13,13 @@
 # See the Mulan PSL v2 for more details.
 #**************************************************************************************/
 
-ISA ?= x86
-ISAS = $(shell ls $(NEMU_HOME)/src/isa/)
+ISA    = $(if $(CONFIG_ISA),$(call remove_quote,$(CONFIG_ISA)),x86)
+ISAS   = $(shell ls $(NEMU_HOME)/src/isa/)
+
 ifeq ($(filter $(ISAS), $(ISA)), ) # ISA must be valid
 $(error Invalid ISA=$(ISA). Supported: $(ISAS))
 endif
-NAME := $(ISA)-$(NAME)
+CFLAGS += -D__ISA__=$(ISA)
 CFLAGS += -D__ISA_$(ISA)__=1
+
+NAME := $(ISA)-$(NAME)
diff --git a/scripts/utils.mk b/scripts/utils.mk
new file mode 100644
index 000000000..ec5c9bc65
--- /dev/null
+++ b/scripts/utils.mk
@@ -0,0 +1,19 @@
+#***************************************************************************************
+# Copyright (c) 2014-2021 Zihao Yu, Nanjing University
+#
+# NEMU is licensed under Mulan PSL v2.
+# You can use this software according to the terms and conditions of the Mulan PSL v2.
+# You may obtain a copy of Mulan PSL v2 at:
+#          http://license.coscl.org.cn/MulanPSL2
+#
+# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+# EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+# MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+#
+# See the Mulan PSL v2 for more details.
+#**************************************************************************************/
+
+print-%:
+	@echo $*=$($*)
+
+remove_quote = $(patsubst "%",%,$(1))
diff --git a/tools/kvm-diff/Makefile b/tools/kvm-diff/Makefile
index f11d8a675..7613f6045 100644
--- a/tools/kvm-diff/Makefile
+++ b/tools/kvm-diff/Makefile
@@ -17,8 +17,12 @@ NAME  = kvm
 SRCS  = $(shell find src/ -name "*.c")
 
 SHARE = 1
-INC_DIR += $(NEMU_HOME)/include $(NEMU_HOME)/src/isa/x86/include
-ISA = x86
 
+include $(NEMU_HOME)/include/config/auto.conf
+include $(NEMU_HOME)/include/config/auto.conf.cmd
+include $(NEMU_HOME)/scripts/utils.mk
 include $(NEMU_HOME)/scripts/isa.mk
+
+INC_DIR += $(NEMU_HOME)/include $(NEMU_HOME)/src/isa/$(ISA)/include
+
 include $(NEMU_HOME)/scripts/build.mk
diff --git a/tools/qemu-dl-diff/Makefile b/tools/qemu-dl-diff/Makefile
index aac201f1f..b9aa9262e 100644
--- a/tools/qemu-dl-diff/Makefile
+++ b/tools/qemu-dl-diff/Makefile
@@ -1,9 +1,14 @@
 NAME  = qemu
+
+include $(NEMU_HOME)/include/config/auto.conf
+include $(NEMU_HOME)/include/config/auto.conf.cmd
+include $(NEMU_HOME)/scripts/utils.mk
+include $(NEMU_HOME)/scripts/isa.mk
+
 SRCS  = $(shell find src/ -name "*.c" | grep -v "isa")
 SRCS += $(shell find src/isa/$(ISA) -name "*.c")
 
 SHARE = 1
 CFLAGS += -DNEMU_HOME=$(NEMU_HOME)
 
-include $(NEMU_HOME)/scripts/isa.mk
 include $(NEMU_HOME)/scripts/build.mk
diff --git a/tools/qemu-socket-diff/Makefile b/tools/qemu-socket-diff/Makefile
index 1e763bac2..45c10d18a 100644
--- a/tools/qemu-socket-diff/Makefile
+++ b/tools/qemu-socket-diff/Makefile
@@ -12,13 +12,18 @@
 #
 # See the Mulan PSL v2 for more details.
 #**************************************************************************************/
-
 NAME  = qemu
+
+
+include $(NEMU_HOME)/include/config/auto.conf
+include $(NEMU_HOME)/include/config/auto.conf.cmd
+include $(NEMU_HOME)/scripts/utils.mk
+include $(NEMU_HOME)/scripts/isa.mk
+
 SRCS  = $(shell find src/ -name "*.c" | grep -v "isa")
 SRCS += $(shell find src/isa/$(ISA) -name "*.c")
 
 SHARE = 1
 CFLAGS += -DNEMU_HOME=$(NEMU_HOME) -D_ISA_H_=\"isa/$(ISA).h\"
 
-include $(NEMU_HOME)/scripts/isa.mk
 include $(NEMU_HOME)/scripts/build.mk