UBUNTU14 debugging the Linux kernel with QEMU

Source: Internet
Author: User

# Download Kernel source code compile kernel CD~/linuxkernel/wget https://Www.kernel.org/pub/linux/kernel/v3.x/linux-3.18.6.tar.xzXz-d linux-3.18.6. Tar.xz Tar-XVF linux-3.18.6. Tar CD Linux-3.18.6make I386_defconfig make # usually compiles for a long time, less 20 minutes more hours # Create root file system CD~/linuxkernel/mkdir rootfs git clone # If you are wall, you can use the Attachment menu.zip CD menu gcc-o init linktable.c menu.c test.c-m32-Static–lpthread CD./rootfs CP ./menu/init./find.| Cpio-o-HNEWC |gzip-9>.. /rootfs.img # Launch Menuos system CD~/linuxkernel/Qemu-kernel linux-3.18.6/ARCH/X86/BOOT/BZIMAGE-INITRD rootfs.img

In the execution qemu-kernel linux-3.18. 6/ARCH/X86/BOOT/BZIMAGE-INITRD rootfs.img times wrong, no qemu this command.

Correct practice:qemu-system-i386-kernel linux-3.18.6/arch/x86/boot/bzimage-initrd rootfs.img

Cause Analysis:

I thought I didn't install QEMU, so I started the installation, according to Http://jingyan.baidu.com/album/b907e627cfffc946e7891cd5.html's URL

sudo apt-get install QEMU-KVM libvirt-bin virt-manager bridge-utils

Lsmod | grep KVM

Virsh-c Qemu:///system List

But later found this site: http://blog.csdn.net/xsckernel/article/details/8159548#comments

Know that KVM is the system comes with, so uninstalled the original installed

sudo apt-get remove QEMU-KVM

sudo apt-get remove Libvirt-bin

sudo apt-get remove Virt-manager

sudo apt-get remove bridge-utils

But I don't know why KVM exists. For example: Lsmod | grep KVM

By URL: http://zhangjun2915.blog.163.com/blog/static/3808623620103585320514/

To know that/usr/bin/qemu-system-x86_64 is QEMU-KVM

So I see it in the/esr/bin/directory:

The qemu-system-x86_64 is thus determined to be an analog 64-bit system,qemu-system-i386 is an analog 32-bit system.

So the last line of command changes to:

Qemu-system-i386-kernel LINUX-3.18.6/ARCH/X86/BOOT/BZIMAGE-INITRD rootfs.img

The effects that can be run are:

    • Reconfigure Linux to carry debug information
On the basis of the original configuration, in the shell Terminal input: Make Menuconfig

The error message is as follows:

In file included from scripts/kconfig/lxdialog/checklist.c:24:

Scripts/kconfig/lxdialog/dialog.h:31:20:error:curses.h: No file or directory

In file included from scripts/kconfig/lxdialog/checklist.c:24:

Reference URL: http://blog.chinaunix.net/uid-25896350-id-367612.html

Workaround: sudo apt-get install Libncurses5-dev

Then re-enter: Make Menuconfig, the effect is as follows: Press space to select kernel hacking->

Press space to select Compile-time checks and complier options-

Press space to select [*] compile the kernel with debug info, then save exit.

Make recompile (longer) use GDB to trace the debug kernel
    Qemu-system-i386-kernel LINUX-3.18.6/ARCH/X86/BOOT/BZIMAGE-INITRD Rootfs.img-s-S # Description of the-s and-sec    options:- S Freeze CPU at startup (with ' C ' to start execution)      for-gdb tcp::1234 If you do not want to use port 1234, you can replace the-s option with-gdb tcp:xxxx
Open another Shell window
    gdb    (gdb) file Linux-3.18.  6/vmlinux # Targe remote before loading symbol table    (GDB) in GDB interface target remote:1234  # Establishing a connection between GDB and Gdbserver , press C to allow the Linux on QEMU to continue running    (GDB)break Start_kernel # Breakpoint settings can be before target remote, or after
Experimental results:

UBUNTU14 debugging the Linux kernel with QEMU

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