poc

M/o/Vfuscator

The single instruction compiler.

Overview

This original M/o/Vfuscator (M/o/Vfuscator 1.0) compiles programs into mov instructions from the esoteric language BrainF@$!, and is best used in conjunction with the BFBASIC compiler by Jeffry Johnston.

Usage

Compile the M/o/Vfuscator with:

  gcc movfuscator.c -o movfuscator

Compile BF to movs with:

  ./movfuscator < example.bf > example.asm

Build a mov executable:

  nasm -felf example.asm -o example.o
  ld -melf_i386 example.o -o example

The complete process from a BASIC program to a mov-only executable:

  ./bfbasic.sh example.bas example.bf
  ./movfuscator < example.bf > example.asm
  nasm -felf example.asm -o example.o
  ld -melf_i386 example.o -o example
  ./example

Flags:

  -mmio    Use memory mapped I/O.  Allows mov instructions instead of int 0x80 for I/O, but requires I/O streams to be backed by files.
  -nojmp   Replace the single jmp instruction with a faulting mov to implement the program loop.
  -mov     Use only mov instructions; same as -mmio -nojmp.
  -cell16  Use 16 bit memory cells.
  -O       Enable optimization.

Author

• chris domas, @xoreaxeaxeax

References

• BFBASIC: http://brainfuck.cvs.sourceforge.net/viewvc/brainfuck/bfbasic/
• Example BF programs: http://esoteric.sange.fi/brainfuck/bf-source/prog/
• "mov is Turing-complete", by Stephen Dolan: http://www.cl.cam.ac.uk/~sd601/papers/mov.pdf