49 lines
1.1 KiB
Ruby
Executable File
49 lines
1.1 KiB
Ruby
Executable File
#!/usr/bin/env ruby
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#
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# $Id$
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#
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# This tool provides an easy way to see what opcodes are associated with
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# certain x86 instructions by making use of nasm if it is installed and
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# reachable through the PATH environment variable.
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#
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# $Revision$
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#
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$:.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
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require 'rex'
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require 'rex/ui'
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# Check to make sure nasm is installed and reachable through the user's PATH.
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begin
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Rex::Assembly::Nasm.check
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rescue RuntimeError
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puts "#{$!}"
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exit
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end
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bits = ARGV.length > 0 ? ARGV[0].to_i : 32
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if ! [16, 32, 64].include?(bits) then
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puts "#{bits} bits not supported"
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exit 1
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end
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# Start a pseudo shell and dispatch lines to be assembled and then
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# disassembled.
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shell = Rex::Ui::Text::PseudoShell.new("%bldnasm%clr")
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shell.init_ui(Rex::Ui::Text::Input::Stdio.new, Rex::Ui::Text::Output::Stdio.new)
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shell.run { |line|
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line.gsub!(/(\r|\n)/, '')
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line.gsub!(/\\n/, "\n")
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break if (line =~ /^(exit|quit)/i)
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begin
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puts(Rex::Assembly::Nasm.disassemble(
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Rex::Assembly::Nasm.assemble(line, bits), bits))
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rescue RuntimeError
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puts "Error: #{$!}"
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end
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}
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