metasploit-framework/lib/metasm/samples/a.out.rb

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# This file is part of Metasm, the Ruby assembly manipulation suite
# Copyright (C) 2006-2009 Yoann GUILLOT
#
# Licence is LGPL, see LICENCE in the top-level directory
#
# here we build a simple a.out executable
#
require 'metasm'
Metasm::AOut.assemble(Metasm::Ia32.new, <<EOS).encode_file('m-a.out')
.text
.entrypoint
mov eax, 4
mov ebx, 1
.data
str db "kikoo\\n"
strend:
.text
mov ecx, str
mov edx, strend - str
int 80h // linux sys_write
mov eax, 1
mov ebx, 42
int 80h // linux sys_exit
ret
EOS