What is the deployment method of kernel debug environment

What is the deployment method of the kernel debug environment, many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can get something.

I. compiling ramfs

Here you can simply use mkinitramfs or mkinitrd to create a ramfs file. But this way the system boots into the initramfs system and there is no real root file system mounted.

Mkinitramfs-o ramdisk.img

two。 Using buildroot to build an automatic root file system

2.1 download buildroot code

Download source files from buildroot

2.2 decompress and execute make menuconfig

2.3 configure System configuration-> Root password

Filesystem images-> cpio root filesystem

2.4 make

2.5 after compilation, a rootfs.cpio file is generated in the output/images directory.

II. Compile the kernel

Download the kernel source code

Download the kernel source code from https://www.kernel.org/

two。 Configure the kernel

To execute make menuconfig to configure the kernel, you need to enable the kernel debug function. It is enabled by default. Confirm CONFIG_DEBUG_INFO=y in the .config file.

3. Compile

Execute make-j8 to compile. It takes a long time to compile and generates a vmlinux file. A bzImage file is generated in the arch/x86_64/boot directory

Third, start the virtual machine

Start the virtual machine

Qemu-kvm-kernel $kernel_path/arch/x86_64/boot/bzImage\-nographic-append "console=ttyS0 nokaslr"\-initrd $buildroot/output/images/rootfs.cpio\-m 1024\-- enable-kvm\-cpu host\-s-S4, debug kernel

1. Start gdb

Gdb. / vmlinux

two。 Connect the virtual machine

Target remote: 1234

Debug kernel

Hbreak start_ Kernel v. Automated deployment scripts

Here is an automatic deployment script that can be modified to adapt to the use of

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