【操作系统xv6】学习记录1

前置说明：
git-v9版本：git clone https://github.com/mit-pdos/xv6-public/tree/xv6-rev9
bili:https://www.bilibili.com/video/BV15r4y1z75F
深圳大学罗秋明老师的课程
我自己用的wsl2的ubuntu18 无桌面版本 make qemu-nox

bug

起初在双系统的ubuntu20桌面版上运行，前面都很好，make qemu时load disk走不动了，但是运行2022版没问题，但和罗老师的视频不匹配，就回到了v9上，后来用阿里云的centos，因为不支持虚拟化，用不了。
然后就回到了wsl2的ubuntu18上
来来回回折腾环境一天，猫了个咪的！！

启动

启动，进入xv6-public的目录执行

justin@DESKTOP-NIK28BI:/mnt/d/code/vc6/xv6-public-xv6-rev9$ make qemu-nox

退出：ctrl+A  然后按 x退出

1+0 records out
512 bytes copied, 0.000731004 s, 700 kB/s
dd if=kernel of=xv6.img seek=1 conv=notrunc
350+1 records in
350+1 records out
179440 bytes (179 kB, 175 KiB) copied, 0.0676181 s, 2.7 MB/s
qemu-system-i386 -nographic -drive file=fs.img,index=1,media=disk,format=raw -drive file=xv6.img,index=0,media=disk,format=raw -smp 2 -m 512
xv6...
cpu1: starting
cpu0: starting
sb: size 1000 nblocks 941 ninodes 200 nlog 30 logstart 2          inodestart 32 bmap start 58
init: starting sh
$ QEMU: Terminated

文件类型：1目录 2普通文件 3设备文件
ctrl + p 可以看到当前已经启动的进程信息

$ 1 sleep  init 80103ecf 80103f67 801047c8 80105739 801055db
2 sleep  sh 80103e93 801002aa 80100f6c 80104ac2 801047c8 80105739 801055db

justin@DESKTOP-NIK28BI:/mnt/d/code/vc6/xv6-public-xv6-rev9$ addr2line -e kernel 80103e13
/mnt/d/code/vc6/xv6-public-xv6-rev9/proc.c:334

shell 进程 在读缓冲器，因为键盘没有输入，读不到，所以就sleep了。

调试xv6

启动gdb sever, 切记因为我没有桌面，所以用make qemu-nox-gdb， 有桌面的可以：make qemu-gdb
用的tcp协议26000端口

justin@DESKTOP-NIK28BI:/mnt/d/code/vc6/xv6-public-xv6-rev9$ make qemu-nox-gdb
*** Now run 'gdb'.
qemu-system-i386 -nographic -drive file=fs.img,index=1,media=disk,format=raw -drive file=xv6.img,index=0,media=disk,format=raw -smp 2 -m 512  -S -gdb tcp::26000

再来一个客户端

justin@DESKTOP-NIK28BI:/mnt/d/code/vc6/xv6-public-xv6-rev9$ gdb -silent kernel
Reading symbols from kernel...done.
warning: File "/mnt/d/code/vc6/xv6-public-xv6-rev9/.gdbinit" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load".
To enable execution of this file add
        add-auto-load-safe-path /mnt/d/code/vc6/xv6-public-xv6-rev9/.gdbinit
line to your configuration file "/home/justin/.gdbinit".
To completely disable this security protection add
        set auto-load safe-path /
line to your configuration file "/home/justin/.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
        info "(gdb)Auto-loading safe path"
(gdb)

等待客户端输入命令了