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Build Status

Machine code is often hidden from view and difficult to work with. This project aims to lift the veil.

This project is about the development of tools that relate to machine code and object formats; for all architectures.

Here you'll find libraries for working with binary code: assembly, disassembly, instruction tables, object formats and related areas.

Current status

The x86/amd64 assembler is operational, but not recommended for general use. Creating ELF object files is possible only through crafting the correct assembler directives yourself.

The disassemblers are operational: arm-a64, m68hc12, i8080, x86-64, x86-32, x86-16, mipsbe, and mipsel.

The ELF library is useful for read operations.

Documentation is sparse.


With Akku.scm:

$ akku install machine-code
$ source .akku/bin/activate

Otherwise refer to your Scheme implementation's documentation on using R6RS libraries.


Try the fcdisasm program (the real output has color):

$ fcdisasm /bin/ls | head
ELF image detected. Looking for .text section...
  4028A0: 4157                           (push r15)
  4028A2: 4156                           (push r14)
  4028A4: 4155                           (push r13)
  4028A6: 4154                           (push r12)
  4028A8: 55                             (push rbp)
  4028A9: 53                             (push rbx)
  4028AA: 89FB                           (mov ebx edi)
  4028AC: 4889F5                         (mov rbp rsi)
  4028AF: 4881EC98030000                 (sub rsp #x398)

The x86-demo and x86-linux-demo programs build simple object files.

The disassembler libraries all export a get-instruction procedure that takes an input port and a collect procedure. (The MIPS disassembler also takes an endianness, and the x86 disassembler takes an operating mode). The collect procedure can be #f; otherwise it is called with groups of bytes that have been read from the instruction stream.

New in 2.0.0

New disassembler for ARM A64 (used in AArch64, ARMv8)

The new (machine-code disassembler arm-a64) library disassembles 64-bit ARM code.

Generic disassembler library

The new (machine-code disassembler) library provides an abstract interface to all current and future disassemblers.

Incompatible change

The procedure signatures for all disassemblers has changed. An additional pc argument has been added. It can be the current program counter (the address of the instruction) or #f. If it's #f then symbolic expressions are used in place of a computed PC-relative address.


Contributions are very welcome as long as they are relevant to the goals stated at the top of this file, and licensed under the MIT license. Bug fixes, new libaries and tools are all welcome. External dependencies must be managed with Akku.scm.


The author can be contacted through the issue tracker on GitHub: