qemu调试linux（二）

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GDB调试

当前文件夹目录 Makefile文件 

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cpvmlinux:  
cp /home/dsd/Code/linux-5.18.10/vmlinux vmlinux  
  
cpimage:  
cp /home/dsd/Code/linux-5.18.10/arch/x86/boot/bzImage ./bzImage  
  
initramfs:  
cd ./initramfs_dir && find . -print0 | cpio -ov --null --format=newc | gzip -9 > ../initramfs.img  
  
run:  
qemu-system-x86_64 \  
-kernel bzImage \  
-initrd initramfs.img \  
-m 1G \  
-nographic \  
-append "earlyprintk=serial,ttyS0 console=ttyS0"  
  
  
debug:  
qemu-system-x86_64 \  
-kernel bzImage \  
-initrd initramfs.img \  
-m 1G \  
-nographic \  
-append "earlyprintk=serial,ttyS0 console=ttyS0 nokaslr" \  
-S \  
-gdb tcp::9000
此目录下新建.gdbinit文件 
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target remote :9000  
break start_kernel  
continue  
step
在root/.gdbinit文件增加add-auto-load-safe-path /home/dsd/Code/qemu_linux_x86_5.18_space/.gdbinit 运行指令，任选一条 
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gdb vmlinux
gdb-multiarch vmlinux --tui

vscode调试

wsl权限问题，目录往外多一些 

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chown 755 <usr> *
生成编译指令信息，此时linux源码根目录下增加文件compile_commands.json 
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./scripts/clang-tools/gen_compile_commands.py
配置.vscode/lanuch.json 
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{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "qemu-kernel-gdb",
            "type": "cppdbg",
            "request": "launch",
            "miDebuggerServerAddress": "127.0.0.1:9000",
            "program": "${workspaceRoot}/vmlinux",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${fileDirname}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "gdb",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ]
        },
    ]
}
配置.vscode/c_cpp_properties.json 
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{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/**"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "c11",
            "cppStandard": "gnu++14",
            "intelliSenseMode": "linux-gcc-x64",
            "compileCommands": "${workspaceFolder}/compile_commands.json"
        }
    ],
    "version": 4
}
开始调试

附：调试qemu虚拟机模板

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{
    // 使用 IntelliSense 了解相关属性。 
    // 悬停以查看现有属性的描述。
    // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "name",
            "type": "cppdbg",
            "request": "launch", 
            "program": "debug.elf",//vmlinux路径，debug的文件 <--修改这里
            "args": [],//启动参数,如果需要记录日志可以自己增加参数。因为gdbsever已经有了参数，这里可以不用设置
            "stopAtEntry": true,//会自动停在main,不需要则设置为false
            "cwd": "${workspaceRoot}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "gdb", //运行模式
            "logging": {
                "moduleLoad": false,
                "engineLogging": false,
                "trace": false
            },
            "setupCommands": [ //命令
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                },
                {
                    "description": "set architecture aarch64",
                    "text": "set architecture aarch64",
                    "ignoreFailures": true
                }
            ],
            "miDebuggerPath":"gdb-multiarch",//工具链gdb，arm下要使用多分支
            "miDebuggerServerAddress":"localhost:1234"//远程端口

        }
    ]
}