Date: Fri, 26 Feb 1999 14:12:08 -0500
Message-Id: <199902261912.OAA24117@envy.delorie.com>
X-Authentication-Warning: envy.delorie.com: dj set sender to dj AT envy DOT delorie DOT com using -f
From: DJ Delorie <dj AT delorie DOT com>
To: djgpp AT delorie DOT com
In-reply-to: <7b6qpv$39t$1@news8.svr.pol.co.uk>
	(andrew AT lemure DOT freeserve DOT co DOT uk)
Subject: Re: Generating Machine Code on the fly
References:  <7b6qpv$39t$1 AT news8 DOT svr DOT pol DOT co DOT uk>
Reply-To: djgpp AT delorie DOT com


> Is it possible to allocate an area of memory in djgpp using malloc,
> fill it full of bytes of machine code, and then, using an asm
> statement, push all the registers, call the area of memory as a
> subroutine, pop all the registers when that subroutine returns, and
> continue running the C program without any damage being done?

This is exactly what the stub does :-) so it should work for you.

Of course, getting the machine code *right* might not be trivial.

> I assume that there would be some kind of limitation on the quantity of
> machine code that could be run in this way?

You're limited to a few hundred megabytes, probably.  Depends on how
much memory you can malloc.