Random recording (QEMU emulation Linux kernel)

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From the beginning of graduate school, I see kernel time is not short. Although the code read a lot, the principle of the book also read a lot, but always think that understanding is not very thorough. debugging kernel It is best to be able to run a single step, just like debugging a normal run file.

After using Qemu a while ago, it is really convenient to debug kernel with QEMU.

(1) Installing QEMU

sudo apt-get install QEMU-KVM

sudo apt-get install Qemu

(2) Compiling kernel

Cp/boot/config-3.8.0-19-generic. config

Make Menuconfig, save

Make Bzimage-j4

(3) file system directly using the Linux distribution's own RAM file system

Cp/boot/initrd.img-3.8.0-19-generic initrd.img

(4) Simulation kernel, start

Qemu-kernel BZIMAGE-INITRD initrd.img

(5) False assumption debugging bzimage, how to do?

Client:qemu-kernel BZIMAGE-INITRD Initrd.img-s-S

Gdb:gdb Vmlinux

Target remote:1234

b Start_kernel

C

(6) Simulation of x86 environment under dual-core

Qemu-kernel BZIMAGE-INITRD INITRD.IMG-SMP 2
QEMU uses multi-threaded methods to emulate multicore, each of which represents a core.

It's really interesting to be able to debug multi-core x86 CPUs with debugging multithreaded methods.

Random recording (QEMU emulation Linux kernel)