Re: [MiNT] XaAES and appl_init()

["Helmut Karlowski" <helmut.karlowski@ish.de>]

Gerhard Stoll, 28.02.2013 17:41:30:

> Vincent Rivière wrote:
>
> > But it does that in supervisor mode, while calling the AES from
> > supervisor is forbidden.
>
> No is not, but it is difficult.
>
> I found a text (page 589) in a german book called "Atari Profibuch
> ST-STE-TT".
>
> Sorry, maybe someone can translate this.

As I understand this the problems that may arise are:

- The AES (here: EmuTOS) switches to user-mode when the AES-call returns

- User- and the Supervisor-Stack must not overlap

- The AES may write beyond the Supervisor-Stack.

Correct?

> Ein "sicherer" Aufruf sollte daher etwa so aussehen (Quelle: "TOS 1.4
> Release Notes"):
>
> char my_stack [8192];
>
> old_ssp	Super (&my_stack(8180));  /* nicht ganz aufs Ende! */

Shouldn't this be

old_ssp	= Super (&my_stack[8180]);  /* nicht ganz aufs Ende! */

?

--
Helmut Karlowski