vscode + qemu + gdb 搭建内核开发环境

https://zhuanlan.zhihu.com/p/105069730

在能够使用 qemu + gdb 调试内核之后，怎么连上 vscode 呢？

看看参考的知乎文章，再看看这个视频： https://www.bilibili.com/video/BV19Y41157bK/?spm_id_from=333.788&vd_source=7a1a0bc74158c6993c7355c5490fc600

先安装这个插件

 

 

然后创建 .vscode/launch.json 文件，点击 add configuration，创建template

 

这是我的launch.json配置：

 

    {

        "name": "kernel-debug",

        "type": "cppdbg",

        "request": "launch",

        "program": "${workspaceFolder}/build/kernel.bin",

        "stopAtEntry": false,

        "args": [],

        "cwd": "${workspaceFolder}",

        "environment": [],

        "externalConsole": false,

        "MIMode": "gdb",

        "miDebuggerServerAddress": "127.0.0.1:1234",

        "logging": {

            "engineLogging": false

        },

    }

 

 

如果要调试 nasm 程序的话：

 

launch.json

 

    {

      "name": "nasm",

      "type": "cppdbg",

      "request": "launch",

      "program": "${fileDirname}/${fileBasenameNoExtension}.out",

      "args": [],

      "stopAtEntry": false,

      "cwd": "${fileDirname}",

      "environment": [],

      "externalConsole": false,

      "MIMode": "gdb",

      "setupCommands": [

        {

          "description": "Enable pretty-printing for gdb",

          "text": "-enable-pretty-printing",

          "ignoreFailures": true

        },

        {

          "description": "Set Disassembly Flavor to Intel",

          "text": "-gdb-set disassembly-flavor intel",

          "ignoreFailures": true

        }

      ],

      "preLaunchTask": "nasm",

      "miDebuggerPath": "/usr/bin/gdb"

    }

 

总的来说, launch.json 是

{

    "configurations": [

    {

        "name": "kernel-debug",

        "type": "cppdbg",

        "request": "launch",

        "program": "${workspaceFolder}/build/kernel.bin",

        "stopAtEntry": false,

        "args": [],

        "cwd": "${workspaceFolder}",

        "environment": [],

        "externalConsole": false,

        "MIMode": "gdb",

        "miDebuggerServerAddress": "127.0.0.1:1234",

        "logging": {

            "engineLogging": false

        },

    },

    {

      "name": "nasm",

      "type": "cppdbg",

      "request": "launch",

      "program": "${fileDirname}/${fileBasenameNoExtension}.out",

      "args": [],

      "stopAtEntry": false,

      "cwd": "${fileDirname}",

      "environment": [],

      "externalConsole": false,

      "MIMode": "gdb",

      "setupCommands": [

        {

          "description": "Enable pretty-printing for gdb",

          "text": "-enable-pretty-printing",

          "ignoreFailures": true

        },

        {

          "description": "Set Disassembly Flavor to Intel",

          "text": "-gdb-set disassembly-flavor intel",

          "ignoreFailures": true

        }

      ],

      "preLaunchTask": "nasm",

      "miDebuggerPath": "/usr/bin/gdb"

    }

    ]

}

 

 

tasks.json长得不太一样

 

tasks.json:

 

{

        "type": "shell",

        "label": "nasm",

        "command": "",

        "args": [

          "/usr/bin/nasm",

          "-f",

          "elf32",

          "-g",

          "${file}",

          "-o",

          "${fileDirname}/${fileBasenameNoExtension}.o",

          ";",

          "/usr/bin/gcc",

          "-fdiagnostics-color=always",

          "-m32",

          "-g",

          "-static",

          "${fileDirname}/${fileBasenameNoExtension}.o",

          "-o",

          "${fileDirname}/${fileBasenameNoExtension}.out"

        ],

        "options": {

          "cwd": "${fileDirname}"

        },

        "problemMatcher": [

          "$gcc"

        ],

        "group": {

          "kind": "build",

          "isDefault": true

        },

        "detail": "Task generated by Debugger."

      }

 

 

注意，nasm 的 -gdwarf 选项是使用 gdb 调试 nasm 程序所必须的，且这个选项不能与 -f bin 混合使用 （也正是这个原因，boot.asm 无法用 gcc 调试，但是这种小规模的代码，有 qemu+gdb 在汇编进行调试就够了）