对着内核原文件打断点，然后使用 Debug xv6 kernel with GDB…… 
.vscode/launch.json 
{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Debug xv6 kernel with GDB",
            "type": "cppdbg",
            "request": "launch",
            "program": "${workspaceFolder}/kernel/kernel",
            "cwd": "${workspaceFolder}",
            "MIMode": "gdb",
            "miDebuggerPath": "ri...