[fpc-pascal]wow quite cool example you made there :)

[Harald Houppermans]

----- Original Message ----- 
From: "Nikolay Nikolov" <nickysn at SexMagnet.com>
To: <fpc-pascal at lists.freepascal.org>
Sent: Thursday, March 18, 2004 12:04 PM
Subject: Re: [fpc-pascal]wow quite cool example you made there :)


> Harald Houppermans wrote:
>
> >WOW very interesting indeed
> >
> >I thought you did it like this:
> >
> >asm
> >  mov CS, blabla
> >  mov IP, blabla
> >end
> >
> >But now I see !!!
> >
> >You are actually using the parameters:
> >
> >CS := blabla; :)
> >IP := blabla; :)
> >
> >
> >Those interrupt parameters actually allow something which otherwise isn't
> >allowed ?!
> >
> The CS and IP parameters access the return address stored on the stack.
> (so after the iretd it will continue executing from there) In 16-bit DOS
> you can even simulate multithreading using this. Just hook int8 and
> store the CS/IP and all the other registers for the current thread and
> load CS/IP/registers of the next thread to be executed. Alas I didn't
> find a way to do that in 32-bit DPMI. :)

wdosx/dwpl found a way to do that... maybe you should take a look at that :D

Though it's website got hacked twice in one week :D