> compile NEMU

ysyx_22040000 李心杨
Linux calcite 6.6.19 #1-NixOS SMP PREEMPT_DYNAMIC Fri Mar  1 12:35:11 UTC 2024 x86_64 GNU/Linux
 15:42:07  up   5:18,  2 users,  load average: 0.69, 0.52, 0.45

flake.nix

@@ -65,6 +65,7 @@
         devShells.nemu = pkgs.mkShell {
           packages = with pkgs; [
             clang-tools
+            gdb
           ];
           inputsFrom = [
             self.packages.${system}.nemu

nemu/src/cpu/cpu-exec.c

@@ -75,6 +75,9 @@ static void exec_once(Decode *s, vaddr_t pc) {
 
 static void execute(uint64_t n) {
   Decode s;
+#ifdef CONFIG_ITRACE
+  memset(s.logbuf, 0, CONFIG_ITRACE_BUFFER * 128 * sizeof(char));
+#endif
   for (;n > 0; n --) {
     exec_once(&s, cpu.pc);
     g_nr_guest_inst ++;