> compile NEMU

ysyx_22040000 李心杨
Linux calcite 6.1.75 #1-NixOS SMP PREEMPT_DYNAMIC Thu Jan 25 23:27:52 UTC 2024 x86_64 GNU/Linux
 22:37:19  up   4:38,  2 users,  load average: 0.35, 0.17, 0.15

nemu/src/monitor/sdb/addrexp.y

@@ -1,5 +1,6 @@
 %code requires {
     #include <common.h>
+    #include <memory/vaddr.h>
     #include <stdio.h>
     #include <stdlib.h>
     extern int yylex(void);
@@ -41,6 +42,7 @@ expression
         $$ = $1 / $3;
       }
     | '-' number { $$ = -$2; }
+    | '*' expression { printf("deref: %u\n", $2); }
     | '(' expression ')' { $$ = $2; }
 
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