Re: A89: TIOS calling conventions

To: assembly-89@lists.ticalc.org
Subject: Re: A89: TIOS calling conventions
From: Xavier VASSOR <xvassor@mail.dotcom.fr>
Date: Thu, 21 Jan 1999 18:33:02 +0100
Delivered-To: assembly-89-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-89@lists.ticalc.org
Organization: The Doors Team
References: <v04011700b2cc1333e7c5@[146.151.40.69]>
Reply-To: assembly-89@lists.ticalc.org


> How does TIOS pass variables to and results from command line functions?
> Say I was going to write an asm function like 3Dto2D(x,y,z) that would take
> a 3D point and convert it to a 2D point to display on the screen.  I'm
> guessing that the three variables would be passed on the stack, but how
> would the result be returned?  I thought it would be returned on the stack,
> but all that talk about resetting the stack pointer convinced me otherwise.

I suppos you want this function to be called from a BASIC prog or the
Home Screen.
Then I think that the command line is stored in handle
doorsos::HomeEntryHandle, but I don't know the format of the command
line so it has to be studied.

>From then the return value shoud be given to doorsos::ReturnValue
In fact doorsos::ReturnValue will point to the last byte of the returned
variable since the TIOS since to process all variables from the end.

I don't have more infos about that, but I'm sure you could find yourself
lots of infos using Rusty's debugger. Just put a breakpoint on
Read/Write the address corresponding to HomeEntryHandle ($7708 I
think..)

If you find more infos, please tell me cause I'm a little interested in
this

Good Luck !

Xavier VASSOR
---The Doors Team
E-mail:xvassor@mail.dotcom.fr
Doors Homepage: http://start.at/doors
ICQ:10241721

Follow-Ups:

Re: A89: TIOS calling conventions

From: Nate Mueller <nlmueller@students.wisc.edu>

References:

A89: TIOS calling conventions

From: Nate Mueller <nlmueller@students.wisc.edu>