diff --git a/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c b/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c
similarity index 97%
rename from nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c
rename to nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c
index f85417e..90bafd6 100644
--- a/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c
+++ b/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c
@@ -67,7 +67,7 @@
 
 
 /* First part of user prologue.  */
-#line 1 "src/monitor/sdb/addr-exp.y"
+#line 1 "src/monitor/sdb/addrexp.y"
 
     #include <stdio.h>
     #include <stdlib.h>
@@ -76,7 +76,7 @@
         fprintf(stderr, "Error: %s\n", s);
     }
 
-#line 80 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 80 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
 
 # ifndef YY_CAST
 #  ifdef __cplusplus
@@ -99,7 +99,7 @@
 #  endif
 # endif
 
-#include "addr-exp.h"
+#include "addrexp.h"
 /* Symbol kind.  */
 enum yysymbol_kind_t
 {
@@ -1074,73 +1074,73 @@ yyreduce:
   switch (yyn)
     {
   case 2: /* input: expression  */
-#line 15 "src/monitor/sdb/addr-exp.y"
+#line 15 "src/monitor/sdb/addrexp.y"
                  { printf("Final Result: %d\n", yyvsp[0]); }
-#line 1080 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1080 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
     break;
 
   case 3: /* expression: term  */
-#line 19 "src/monitor/sdb/addr-exp.y"
+#line 19 "src/monitor/sdb/addrexp.y"
            { yyval = yyvsp[0]; }
-#line 1086 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1086 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
     break;
 
   case 4: /* expression: expression '+' term  */
-#line 20 "src/monitor/sdb/addr-exp.y"
+#line 20 "src/monitor/sdb/addrexp.y"
                            { yyval = yyvsp[-2] + yyvsp[0]; }
-#line 1092 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1092 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
     break;
 
   case 5: /* expression: expression '-' term  */
-#line 21 "src/monitor/sdb/addr-exp.y"
+#line 21 "src/monitor/sdb/addrexp.y"
                            { yyval = yyvsp[-2] - yyvsp[0]; }
-#line 1098 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1098 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
     break;
 
   case 6: /* term: factor  */
-#line 25 "src/monitor/sdb/addr-exp.y"
+#line 25 "src/monitor/sdb/addrexp.y"
              { yyval = yyvsp[0]; }
-#line 1104 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1104 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
     break;
 
   case 7: /* term: term '*' factor  */
-#line 26 "src/monitor/sdb/addr-exp.y"
+#line 26 "src/monitor/sdb/addrexp.y"
                        { yyval = yyvsp[-2] * yyvsp[0]; }
-#line 1110 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1110 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
     break;
 
   case 8: /* term: term '/' factor  */
-#line 27 "src/monitor/sdb/addr-exp.y"
+#line 27 "src/monitor/sdb/addrexp.y"
                        { yyval = yyvsp[-2] / yyvsp[0]; }
-#line 1116 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1116 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
     break;
 
   case 9: /* factor: NUMBER  */
-#line 31 "src/monitor/sdb/addr-exp.y"
+#line 31 "src/monitor/sdb/addrexp.y"
              { yyval = yyvsp[0]; }
-#line 1122 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1122 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
     break;
 
   case 10: /* factor: HEX_NUMBER  */
-#line 32 "src/monitor/sdb/addr-exp.y"
+#line 32 "src/monitor/sdb/addrexp.y"
                  { yyval = yyvsp[0]; }
-#line 1128 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1128 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
     break;
 
   case 11: /* factor: '-' factor  */
-#line 33 "src/monitor/sdb/addr-exp.y"
+#line 33 "src/monitor/sdb/addrexp.y"
                  { yyval = -yyvsp[0]; }
-#line 1134 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1134 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
     break;
 
   case 12: /* factor: '(' expression ')'  */
-#line 34 "src/monitor/sdb/addr-exp.y"
+#line 34 "src/monitor/sdb/addrexp.y"
                          { yyval = yyvsp[-1]; }
-#line 1140 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1140 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
     break;
 
 
-#line 1144 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c"
+#line 1144 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.tag.c"
 
       default: break;
     }
@@ -1333,5 +1333,5 @@ yyreturnlab:
   return yyresult;
 }
 
-#line 37 "src/monitor/sdb/addr-exp.y"
+#line 37 "src/monitor/sdb/addrexp.y"
 
diff --git a/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-lex.c b/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.yy.c
similarity index 98%
rename from nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-lex.c
rename to nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.yy.c
index fe53fcd..5b05720 100644
--- a/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-lex.c
+++ b/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.yy.c
@@ -1,6 +1,6 @@
-#line 1 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-lex.c"
+#line 1 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.yy.c"
 
-#line 3 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-lex.c"
+#line 3 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.yy.c"
 
 #define YY_NO_UNPUT 1
 #define YY_NO_INPUT 1
@@ -449,11 +449,11 @@ int yy_flex_debug = 0;
 #define YY_MORE_ADJ 0
 #define YY_RESTORE_YY_MORE_OFFSET
 char *yytext;
-#line 1 "src/monitor/sdb/addr-lex.l"
-#line 2 "src/monitor/sdb/addr-lex.l"
-    #include <addr-exp.h>
-#line 455 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-lex.c"
-#line 456 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-lex.c"
+#line 1 "src/monitor/sdb/addrexp.l"
+#line 2 "src/monitor/sdb/addrexp.l"
+    #include <addrexp.h>
+#line 455 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.yy.c"
+#line 456 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.yy.c"
 
 #define INITIAL 0
 
@@ -670,10 +670,10 @@ YY_DECL
 		}
 
 	{
-#line 6 "src/monitor/sdb/addr-lex.l"
+#line 6 "src/monitor/sdb/addrexp.l"
 
 
-#line 676 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-lex.c"
+#line 676 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.yy.c"
 
 	while ( /*CONSTCOND*/1 )		/* loops until end-of-file is reached */
 		{
@@ -732,35 +732,35 @@ do_action:	/* This label is used only to access EOF actions. */
 
 case 1:
 YY_RULE_SETUP
-#line 8 "src/monitor/sdb/addr-lex.l"
+#line 8 "src/monitor/sdb/addrexp.l"
 { yylval = strtol(yytext, NULL, 16); return HEX_NUMBER; }
 	YY_BREAK
 case 2:
 YY_RULE_SETUP
-#line 9 "src/monitor/sdb/addr-lex.l"
+#line 9 "src/monitor/sdb/addrexp.l"
 { yylval = atoi(yytext); return NUMBER; }
 	YY_BREAK
 case 3:
 YY_RULE_SETUP
-#line 10 "src/monitor/sdb/addr-lex.l"
+#line 10 "src/monitor/sdb/addrexp.l"
 { return *yytext; }
 	YY_BREAK
 case 4:
 YY_RULE_SETUP
-#line 11 "src/monitor/sdb/addr-lex.l"
+#line 11 "src/monitor/sdb/addrexp.l"
 {  }
 	YY_BREAK
 case 5:
 YY_RULE_SETUP
-#line 12 "src/monitor/sdb/addr-lex.l"
+#line 12 "src/monitor/sdb/addrexp.l"
 { printf("Unexpected character: %s\n", yytext); }
 	YY_BREAK
 case 6:
 YY_RULE_SETUP
-#line 13 "src/monitor/sdb/addr-lex.l"
+#line 13 "src/monitor/sdb/addrexp.l"
 ECHO;
 	YY_BREAK
-#line 763 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-lex.c"
+#line 763 "/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addrexp.yy.c"
 case YY_STATE_EOF(INITIAL):
 	yyterminate();
 
@@ -1765,6 +1765,6 @@ void yyfree (void * ptr )
 
 #define YYTABLES_NAME "yytables"
 
-#line 13 "src/monitor/sdb/addr-lex.l"
+#line 13 "src/monitor/sdb/addrexp.l"
 
 
diff --git a/nemu/scripts/build.mk b/nemu/scripts/build.mk
index 7618f4e..0a04409 100644
--- a/nemu/scripts/build.mk
+++ b/nemu/scripts/build.mk
@@ -30,7 +30,6 @@ OBJS = $(SRCS:%.c=$(OBJ_DIR)/%.o) $(CXXSRC:%.cc=$(OBJ_DIR)/%.o)
 # Compilation patterns
 $(OBJ_DIR)/%.o: %.c
 	@echo + CC $<
-	@echo $@ $<
 	@mkdir -p $(dir $@)
 	@$(CC) $(CFLAGS) -c -o $@ $<
 	$(call call_fixdep, $(@:.o=.d), $@)
@@ -41,6 +40,18 @@ $(OBJ_DIR)/%.o: %.cc
 	@$(CXX) $(CFLAGS) $(CXXFLAGS) -c -o $@ $<
 	$(call call_fixdep, $(@:.o=.d), $@)
 
+$(OBJ_DIR)/%.tag.c: %.y
+	@echo + YACC $<
+	@echo $@ $<
+	@mkdir -p $(dir $@)
+	@$(YACC) $(YFLAGS) --header=$(<:.y=.h) -o $@ $<
+
+$(OBJ_DIR)/%.yy.c: %.l $(OBJ_DIR)/%.tag.c
+	@echo + LEX $<
+	@echo $@ $<
+	@mkdir -p $(dir $@)
+	@$(LEX) $(LFLAGS) -o $@ $<
+
 # Depencies
 -include $(OBJS:.o=.d)
 
diff --git a/nemu/src/monitor/sdb/addr-exp.h b/nemu/src/monitor/sdb/addrexp.h
similarity index 94%
rename from nemu/src/monitor/sdb/addr-exp.h
rename to nemu/src/monitor/sdb/addrexp.h
index f957d6a..b5310c4 100644
--- a/nemu/src/monitor/sdb/addr-exp.h
+++ b/nemu/src/monitor/sdb/addrexp.h
@@ -35,8 +35,8 @@
    especially those whose name start with YY_ or yy_.  They are
    private implementation details that can be changed or removed.  */
 
-#ifndef YY_YY_SRC_MONITOR_SDB_ADDR_EXP_H_INCLUDED
-# define YY_YY_SRC_MONITOR_SDB_ADDR_EXP_H_INCLUDED
+#ifndef YY_YY_SRC_MONITOR_SDB_ADDREXP_H_INCLUDED
+# define YY_YY_SRC_MONITOR_SDB_ADDREXP_H_INCLUDED
 /* Debug traces.  */
 #ifndef YYDEBUG
 # define YYDEBUG 0
@@ -81,4 +81,4 @@ extern YYSTYPE yylval;
 int yyparse (void);
 
 
-#endif /* !YY_YY_SRC_MONITOR_SDB_ADDR_EXP_H_INCLUDED  */
+#endif /* !YY_YY_SRC_MONITOR_SDB_ADDREXP_H_INCLUDED  */
diff --git a/nemu/src/monitor/sdb/filelist.mk b/nemu/src/monitor/sdb/filelist.mk
index b388333..bad7396 100644
--- a/nemu/src/monitor/sdb/filelist.mk
+++ b/nemu/src/monitor/sdb/filelist.mk
@@ -1,13 +1,13 @@
-SRCS-y += src/monitor/sdb/addr-exp.c src/monitor/sdb/addr-lex.c
+SRCS-y += src/monitor/sdb/addrexp.tag.c src/monitor/sdb/addrexp.yy.c
 INC_PATH += src/monitor/sdb
 LFLAGS += -DYY_NO_UNPUT -DYY_NO_INPUT
 
-/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c: src/monitor/sdb/addr-exp.y
+$(BUILD_DIR)/src/monitor/sdb/addr-exp.c: src/monitor/sdb/addr-exp.y
 	@echo + YACC $<
 	@mkdir -p $(dir $@)
 	@$(YACC) $(YFLAGS) --header=$(<:.y=.h) -o $@ $<
 
-/home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-lex.c: src/monitor/sdb/addr-lex.l /home/xin/repo/ysyx-workbench/nemu/build/obj-riscv32-nemu-interpreter/src/monitor/sdb/addr-exp.c
+$(BUILD_DIR)/src/monitor/sdb/addr-lex.c: src/monitor/sdb/addr-lex.l $(BUILD_DIR)/src/monitor/sdb/addr-exp.c
 	@echo + LEX $<
 	@mkdir -p $(dir $@)
 	@$(LEX) $(LFLAGS) -o $@ $<