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OChicken / linux-0.11-lab

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Linux 0.11 Lab

The old Linux kernel source version 0.11 and the integrated experiment environment.

CS630 Qemu Lab is a related project, it is a friendly learning environment for the X86 assembly course: CS630.

If you want to learn the latest Linux Kernel, please try our Linux Lab

Linux 0.11 Lab Demo

Contents

Introduction

  • Basic information

  • Features

    • compilable with many different versions of Gcc.
    • has been tested under modern Linux, Mac OS X.
    • add bulit-in qemu and bochs support, include running and debugging.
    • integrate different prebuilt rootfs (floopy, ramdisk and harddisk).
    • allow to generate callgraph of every specified function
    • a Dockerfile added to simplify this setup on other systems (e.g. Windows).

Build on Linux

Linux Setup

  • The Linux distributions: debian and ubuntu (>= 14.04) are recommended

  • Install basic tools

      $ sudo apt-get install vim cscope exuberant-ctags build-essential qemu

  • Optional

    $ sudo apt-get install bochs vgabios bochsbios bochs-doc bochs-x libltdl7 bochs-sdl bochs-term $ sudo apt-get install graphviz cflow

Note: The docker install method is recommended in lastest Ubuntu distibutions.

Hack Linux 0.11 on Linux

$ make help		// get help
$ make  		// compile
$ make start-hd	// boot it on qemu with hard disk image
$ make debug-hd	// debug it via qemu & gdb, you'd start gdb to connect it.
$ make start-hd G=0 // Use curses based terminal instead of graphics, friendly for ssh login
$ QEMU_PREBUILT=0 make start-hd // Don't use prebuilt qemu. latest qemu only boot with hd rootfs

$ make switch       // switch to another emulator, between qemu and bochs
Switch to use emulator: bochs


$ gdb images/kernel.sym
(gdb) target remote :1234
(gdb) b main
(gdb) c

$ gdb boot/bootsect.sym  // debug bootsect, step one instruction
(gdb) target remote :1234
(gdb) b _start
(gdb) si

$ gdb boot/setup.sym     // debug setup, similar as above
(gdb) target remote :1234
(gdb) b _start
(gdb) si

Optional

$ echo "add-auto-load-safe-path $PWD/.gdbinit" > ~/.gdbinit  // let gdb auto load the commands in .gdbinit

Build on Mac OS X

Note: A simpler method is use Docker Toolbox with our Dockerfile, see Build on the other systems

Mac OS X Setup

  • Install xcode from "App Store"

  • Install Mac package manage tool: MacPorts from http://www.macports.org/install.php

    • Check your OS X version from "About This Mac", for example, Lion

    • Go to the "Mac OS X Package (.pkg) Installer" part and download the corresponding version

    • Self update MacPorts

            $ xcode-select --switch /Applications/Xcode.app/Contents/Developer
      $ sudo port -v selfupdate

  • Install cross compiler gcc and binutils

      $ sudo port install i386-elf-binutils i386-elf-gcc

  • Install qemu

      $ sudo port install qemu

  • Install graphviz and cflow

      $ sudo port install GraphViz
  $ sudo port install cflow

  • Install gdb. 'Cause port doesn't provide i386-elf-gdb, use the pre-compiled tools/mac/gdb.xz or download its source and compile it.

      $ cd tools/mac/ ; tar Jxf gdb.xz

Optional

$ sudo port install cscope
$ sudo port install ctags

$ wget ftp://ftp.gnu.org/gnu/gdb/gdb-7.4.tar.bz2
$ tar -xzvf gdb-7.4.tar.bz2
$ cd gdb-7.4
$ ./configure --target=i386-elf
$ make

Hack Linux 0.11 on Mac

Same as Hack Linux-0.11 on Linux

Build on Other Systems (include Mac OS X, Windows)

If want to use this Lab on the other systems, such as Windows (and even Mac OS X), with the Dockerfile support, everything is simplified.

Only need to install the docker toolbox, which is a lightweight Linux distribution made specifically to run Docker containers, with this tool and our Dockerfile, we can simply build a Linux 0.11 Lab on every system.

Setup with Docker Toolbox and Dockerfile

  • Install Docker Toolbox and boot into it

    please follow Docker Toolbox Installation.

  • Build and Start the service

      $ git clone https://github.com/tinyclub/cloud-lab.git
  $ cd cloud-lab/ && tools/docker/choose linux-0.11-lab

  $ tools/docker/pull         # Pull from docker hub

  $ tools/docker/run

  • The above command will start a VNC page, login with the password printed in the console

Hack Linux 0.11 on other systems

Same as Hack Linux-0.11 on Linux

Hack Rootfs

Three different root filesystem images are stored in rootfs/:

  • rootram.img -- RAM image
  • rootimage -- Floppy image
  • hdc-0.11.img-- Harddisk image

Ram image

rootram.img is mountable directly:

$ mkdir /path/to/rootram/
$ sudo mount -o rootfs/rootram.img /path/to/rootram/

Floppy image

rootimage-0.11 is a minix filesystem, must with -t minix obviously:

$ sudo mkdir /path/to/rootimage/
$ sudo mount -t minix rootfs/rootimage-0.11 /path/to/rootimage

Harddisk image

hdc-0.11.img has a partition table, should be mounted with an offset:

$ mkdir /path/to/hdc/
$ fdisk -lu rootfs/hdc-0.11.img
$ fdisk -l rootfs/hdc-0.11.img

Disk rootfs/hdc-0.11.img: 127 MB, 127631360 bytes
16 heads, 38 sectors/track, 410 cylinders, total 249280 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

              Device Boot      Start         End      Blocks   Id  System
rootfs/hdc-0.11.img1               2      124031       62015   81  Minix / old Linux
rootfs/hdc-0.11.img2          124032      248063       62016   81  Minix / old Linux

$ sudo mount -o offset=$((2*512)) rootfs/hdc-0.11.img /path/to/hdc/

Examples

Some examples are stored in examples/ with their own README.md:

  • syscall -- shows how to add a new system call

Changes

About

License:GNU General Public License v2.0

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Language:C 77.0%Language:Assembly 12.4%Language:Makefile 7.0%Language:Shell 3.6%Language:GDB 0.0%