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Re: Executing Arbitrary Machine Code in Guile

From: Jan Wedekind
Subject: Re: Executing Arbitrary Machine Code in Guile
Date: Sat, 22 Aug 2015 09:08:59 +0100
User-agent: K-9 Mail for Android

Executing machine code basically just requires a call to mmap to make the data 
executable. The calling code can be generated on the fly using ffi:

On August 22, 2015 12:31:56 AM GMT+01:00, Elzair <address@hidden> wrote:
>The other day I came across a page on Rosetta Code showing how to
>directly execute x86 instructions across several languages:
>For example, here is the code for Racket.
>#lang racket/base
>(require ffi/unsafe)
>; set up access to racket internals
>(define scheme-malloc-code
>(get-ffi-obj 'scheme_malloc_code #f (_fun (len : _intptr) ->
>(define scheme-free-code
>(get-ffi-obj 'scheme_free_code #f (_fun _pointer -> _void)))
>(define opcodes '(139 68 36 4 3 68 36 8 195))
>(define code (scheme-malloc-code 64))
>(for ([byte opcodes]
>[i (in-naturals)])
>(ptr-set! code _ubyte i byte))
>(define function (cast code _pointer (_fun _ubyte _ubyte -> _ubyte)))
>(function 7 12)
>(scheme-free-code code)
>Is this possible in Guile (with, say, the FFI)?

Jan Wedekind

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