# LiteOS # 一、环境安装 ### 1. 安装docker环境 [docker加载镜像下载] 链接: https://pan.baidu.com/s/1GVossI98riHL2xEzo7HmMQ?pwd=we75 提取码: we75 ```console $ cd docker_package $ sudo dpkg -i containerd.io_1.5.11-1_amd64.deb $ sudo dpkg -i docker-ce-cli_20.10.14_3-0_ubuntu-focal_amd64.deb $ sudo dpkg -i docker-ce_20.10.14_3-0_ubuntu-focal_amd64.deb ``` docker加载liteos-env镜像 ```console $ cd docker_images $ sudo docker load -i openharmony-v31.tar ``` ### 2. 下载源代码 [LiteOS v3.1](https://gitee.com/link?target=https%3A%2F%2Frepo.huaweicloud.com%2Fharmonyos%2Fos%2F3.1-Release%2Fcode-v3.1-Release.tar.gz) ### 3. 将用户添加到docker用户组 ```console $ sudo groupadd docker $ sudo gpasswd -a $USER docker $ newgrp docker $ ./run_docker.sh ``` ### 4.编译liteos-a内核和应用 编译 hb set 使用上下方向键盘选择"qemu_small_system_demo" hb build编译 ```console root@62deba27a240:/home/openharmony# hb set root@62deba27a240:/home/openharmony# hb build -f ``` 运行 ```console root@62deba27a240:/home/openharmony# ./qemu-run -f ``` 等待内核在qemu下加载完成，回车，进入OHOS shell 如果无法进入，请检查out目录下是否存在smallmmc.img，不存在请复制smallmmc.img到out目录下 并重新编译执行 ```console root@62deba27a240:/home/openharmony# ./qemu-run -f Redo making flash.img... Start making flash.img... 1+0 records in 1+0 records out 67108864 bytes (67 MB, 64 MiB) copied, 0.498911 s, 135 MB/s 2191+1 records in 2191+1 records out 1122100 bytes (1.1 MB, 1.1 MiB) copied, 0.0123126 s, 91.1 MB/s 0+1 records in 0+1 records out 89 bytes copied, 0.000333672 s, 267 kB/s 9818+1 records in 9818+1 records out 5027048 bytes (5.0 MB, 4.8 MiB) copied, 0.0291576 s, 172 MB/s 63+1 records in 63+1 records out 32492 bytes (32 kB, 32 KiB) copied, 0.000204982 s, 159 MB/s Success making flash.img... Enter to start qemu[y/n]:Waiting VNC connection on: 5920 ...(Ctrl-C exit) ******************Welcome****************** Processor : Cortex-A7 Run Mode : UP GIC Rev : GICv2 build time : Nov 15 2022 11:40:20 Kernel : Huawei LiteOS 2.0.0.37/debug ******************************************* main core booting up... cpu 0 entering scheduler mem dev init ... DevMmzRegister... Date:Nov 15 2022. Time:11:40:19. net init ... [ERR]virtio-mmio ID=1 device not found [ERR]add virtio-mmio net device failed ************************************************************ DeviceManagerStart start ... [CfiFlashInit]CFI flash init start ... [CfiFlashInit]CFI flash init end ... [CfiFlashInit]CFI flash init start ... DeviceManagerStart end ... OsMountRootfs start ... OsMountRootfs end ... virtual_serial_init start ... virtual_serial_init end ... system_console_init start ... system_console_init end ... OsUserInitProcess start ... OsUserInitProcess end ... [ERR]Failed to find block driver /dev/mmcblk0 [ERR]Failed to find block driver /dev/mmcblk1 hilog ringbuffer full, drop 19 line(s) log hilog ringbuffer full, drop 7 line(s) log hilog ringbuffer full, drop 2 line(s) log Set log level : 3 Default log level: 3 [ERR]Unsupported API tcgetpgrp 01-01 00:00:00.081 2 4 D 02500/devmgr_service: DevmgrServiceUpdateStatus host:storage_host 2 device:HDF_PLATFORM_CFI_0 0 status:1 ............... 01-01 00:00:26.001 7 29 I 01800/Samgr: Goto next boot step return code:-9 01-01 00:00:26.002 7 14 I 00000/(null): [appspawn] HOS_SystemInit is called! 01-01 00:00:26.003 7 14 I 00000/(null): [appspawn] main, entering wait. ``` 回车之后进入OHOS shell ```console OHOS:/$ cd bin OHOS:/bin$ ``` 测试结束 Ctrl-A + x 退出Qemu模拟环境 # 二、命令行调试liteOS ### 1、安装`gdb-multiarch`工具包(docker 容器中安装)： ```shell $ apt install gdb-multiarch ``` ### 2、修改`debug.config`文件 ```shell $ cd ./vendor/ohemu/qemu_small_system_demo/kernel_configs $ vim debug.config ``` 将 `LOSCFG_CC_STACKPROTECTOR_ALL=y` 修改为: ```shell # LOSCFG_CC_STACKPROTECTOR_ALL is not set LOSCFG_COMPILE_DEBUG=y ``` ### 3、重新编译项目 保存并退出，在OHOS根目录重新编译: ```shell $ hb build -f ``` ### 4、debug LiteOS 在一个窗口中输入命令： ```shell $ ./qemu-run -g ``` 在另一个窗口中输入命令： ```shell $ docker exec -it ohos /bin/bash $ gdb-multiarch out/arm_virt/qemu_small_system_demo/OHOS_Image (gdb) target remote localhost:1234 (gdb) b main Breakpoint 1 at 0x4005110c: file ../../../kernel/liteos_a/kernel/common/main.c, line 36. (gdb) c Continuing. Breakpoint 1, main () at ../../../kernel/liteos_a/kernel/common/main.c:36 36 { (gdb) l 31 32 #include "los_config.h" 33 #include "los_sched_pri.h" 34 35 LITE_OS_SEC_TEXT_INIT INT32 main(VOID) 36 { 37 UINT32 ret = OsMain(); 38 if (ret != LOS_OK) { 39 return (INT32)LOS_NOK; 40 } (gdb) q ``` * gdb 调试常用代码 1、 b (break) :设置断点 2、 r (run): 运行程序 3、 bt (backtrace): 显示程序栈 4、 Print : 打印变量 5、 c (continue): 继续运行程序，直到下一个断点停止 6、 n (next) : 单步运行程序，不进入函数 7、 l (list) : 查看当前代码（显示当前后10行） 8、 edit (+function): 查看函数代码 9、 S (step) : 进入函数执行代码 10、 Q(Quit)：退出gdb 11、 Info b : 查看断点信息 # 三、VSCode调试liteOS ### 1、安装VScode ```shel $ sudo apt install code ``` ### 2、安装VScode 插件 ![截图 2023-06-02 13-03-44](fig/截图 2023-06-02 13-03-44.png) ### 3、连接docker 选择CONTAINERS目录下openharmony:v3.1...，右键选择附加VScode ![截图 2023-06-02 13-07-32](fig/截图 2023-06-02 13-07-32.png) ### 4、给docker安装VScode插件 * 注意插件一定要安装在docker容器中 ![截图 2023-06-02 13-14-19](fig/截图 2023-06-02 13-14-19.png) ### 5、配置launch.json文件 ```json { "version": "0.2.0", "configurations": [ { "name": "debug liteOS", "type": "cppdbg", "request": "launch", "program": "${workspaceFolder}/out/arm_virt/qemu_small_system_demo/OHOS_Image", "args": [], "stopAtEntry": true, "cwd": "${workspaceFolder}", "miDebuggerServerAddress": "localhost:1234", "miDebuggerPath": "/usr/bin/gdb-multiarch", "environment": [], "externalConsole": false, "MIMode": "gdb", "setupCommands": [ { "description": "pretty printing", "text": "-enable-pretty-printing", "ignoreFailures": true } ], "logging": { "engineLogging": true, "programOutput": true, }, } ] } ``` ### 6、新建终端 运行 ```shell ./qemu-run -g ``` ### 7、vscode debug 点击debug