.gitignore

linux-0.2.img
x86-linux.log

bootstrap.sh

wget http://wiki.qemu.org/download/linux-0.2.img.bz2
bunzip2 linux-0.2.img.bz2

qemu_in_asm_parser.rb

#!/usr/bin/env ruby
require 'awesome_print'
lens = []
curlen = 0
prev_line = ""
opcodes = Hash.new(0)
open("x86-linux.log").read.lines do |line|
  line.chomp!
  if line =~ /^0x/
    curlen += 1
  elsif line == "IN: "
    curlen = 0
  elsif curlen != 0
    lens << curlen
  end

  if line == ""
    # last instruction of block
    # alike "0xfffffff0:  ljmp   $0xf000,$0xe05b"
    last_opcode = prev_line[13,7]
    opcodes[last_opcode] += 1

    #p prev_line if prev_line[13,7] == "mov    "
  end

  prev_line = line
end

#p lens.length
#p lens.inject(:+)
#p lens.inject(:+) / (lens.length + 0.0)
opcodes_r = Hash[opcodes.map{|k, v| [v,k]}]
ap opcodes_r, :sort_keys => true

run-x86-linux.sh

[ -r x86-linux.log ] || qemu -d in_asm -D x86-linux.log linux-0.2.img
./qemu_in_asm_parser.rb | sort -k1 -rn