diff --git a/nemu/include/debug.h b/nemu/include/debug.h
index 7a2cd8a..e29416e 100644
--- a/nemu/include/debug.h
+++ b/nemu/include/debug.h
@@ -48,6 +48,4 @@
 
 #define TODO() panic("please implement me")
 
-
-
 #endif
diff --git a/nemu/src/monitor/sdb/addrexp.y b/nemu/src/monitor/sdb/addrexp.y
index 93c1cc0..cd2e6c9 100644
--- a/nemu/src/monitor/sdb/addrexp.y
+++ b/nemu/src/monitor/sdb/addrexp.y
@@ -31,6 +31,11 @@ input
 
 expression
     : number { $$ = $1; }
+    | expression '=' '=' expression { $$ = ($1 == $3); }
+    | expression '>' '=' expression { $$ = ($1 >= $3); }
+    | expression '<' '=' expression { $$ = ($1 <= $3); }
+    | expression '>' expression { $$ = ($1 > $3); }
+    | expression '<' expression { $$ = ($1 < $3); }
     | expression '+' expression { $$ = $1 + $3; }
     | expression '-' expression { $$ = $1 - $3; }
     | expression '*' expression { $$ = $1 * $3; }