From 7e4321a906afc66e8264976f8fabbdbb4f2588a8 Mon Sep 17 00:00:00 2001
From: tracer-ysyx <tracer@ysyx.org>
Date: Thu, 8 Feb 2024 19:14:37 +0800
Subject: [PATCH] =?UTF-8?q?>=20compile=20NEMU=20ysyx=5F22040000=20?=
 =?UTF-8?q?=E6=9D=8E=E5=BF=83=E6=9D=A8=20Linux=20calcite=206.1.75=20#1-Nix?=
 =?UTF-8?q?OS=20SMP=20PREEMPT=5FDYNAMIC=20Thu=20Jan=2025=2023:27:52=20UTC?=
 =?UTF-8?q?=202024=20x86=5F64=20GNU/Linux=20=2019:14:37=20=20up=201=20day?=
 =?UTF-8?q?=20=204:50,=20=202=20users,=20=20load=20average:=200.62,=200.90?=
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---
 nemu/src/monitor/sdb/sdb.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/nemu/src/monitor/sdb/sdb.c b/nemu/src/monitor/sdb/sdb.c
index 4a1804e..641b1b3 100644
--- a/nemu/src/monitor/sdb/sdb.c
+++ b/nemu/src/monitor/sdb/sdb.c
@@ -31,6 +31,7 @@ static int is_batch_mode = false;
 // command handlers
 static int cmd_help(char *args);
 static int cmd_c(char *args);
+static int cmd_p(char *args);
 static int cmd_q(char *args);
 static int cmd_w(char *args);
 static int cmd_x(char *args);
@@ -54,6 +55,7 @@ static struct CommandTable {
       {"help", "Display information about all supported commands", cmd_help,
        NULL, 0},
       {"c", "Continue the execution of the program", cmd_c, NULL, 0},
+      {"p", "Print expression result", cmd_p, NULL, 0},
       {"q", "Exit NEMU", cmd_q, NULL, 0},
       {"x", "Examine content of physical memory address", cmd_x, NULL, 0},
       {"w", "Break when expression is changed", cmd_w, NULL, 0},
@@ -146,6 +148,22 @@ static int cmd_c(char *args) {
   return 0;
 }
 
+static int cmd_p(char *args) {
+  char *arg = strtok(NULL, " ");
+  bool res = false;
+
+  word_t result = parse_expr(arg, &res);
+  if (!res)
+    goto wrong_usage;
+  printf("%s: %u", arg, result);
+  return 0;
+
+wrong_usage:
+  printf("Invalid argument for command p: %s\n", arg);
+  printf("Usage: p [EXPR: <expr>]\n");
+  return 0;
+}
+
 static int cmd_q(char *args) {
   nemu_state.state = NEMU_QUIT;
   return -1;