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