Linux kernel Analysis--construct a simple Linux system menuos (20135213 Lam Han Jin)

Experimental guidance

• Open the shell with a virtual machine in the lab building

1. CD linuxkernel/
2. Qemu-kernel linux-3.18.6/arch/x86/boot/bzimage -initrd rootfs.img

After the kernel boot is completed into the menu program ("Software Engineering C Coding Practice" course project), support three commands help, version and quit, you can also add more commands, for elective "Software Engineering C Coding practice" of children's shoes should be a piece of cake.

• Debug kernel with GDB trace

1. Qemu-kernel linux-3.18.6/arch/x86/boot/bzimage -initrd rootfs.img-s -S # Description of the-s and-s options:
2. #-S Freeze CPU at startup (with ' C ' to start execution)
3. #-S Shorthand for-gdb tcp::1234 If you do not want to use port 1234, you can use-GDB tcp:xxxx to replace the-s option

Open another Shell window

1. Gdb
2. (gdb)file linux-3.18.6/vmlinux # Load symbol table before Targe remote in GDB interface
3. (GDB) Target remote:1234 # Establish a connection between GDB and Gdbserver, press C to keep the Linux on qemu running
4. (GDB) break Start_kernel # breakpoints can be set before target remote or after

Experimental requirements:

• Booting from Start_kernel to init process using GDB trace debug kernel

• Detailed analysis of the process initiated from Start_kernel to Init process and the combination of experiments to write a signed blog, and in the blog post "real name (and the name of the final application certificate must be consistent) + Original works reproduced please specify the source +" Linux kernel Analysis "MOOC Course/http mooc.study.163.com/course/ustc-1000029000 ", the specific requirements of the blog content are as follows:

• Topic self-proposed, the content revolves around the Linux kernel boot process, namely starts from Start_kernel to the INIT process;

• You need to use an experiment in your blog

• The execution of the Start_kernel function needs to be carefully analyzed in the blog content

• The summary section needs to clarify its understanding of the "Linux system startup process", especially how the idle process, process 1th is coming.

• 3) Please submit the blog post URL to the NetEase cloud classroom MOOC Platform Linux kernel Analysis Mooc course, edited into a link can be directly clicked open.

Linux kernel Analysis--construct a simple Linux system menuos (20135213 Lam Han Jin)