[A83] Re: "forget" ret with calls ?

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: "forget" ret with calls ?
From: Peter-Martijn Kuipers <hyper@@hysoft-automation.com>
Date: Fri, 28 Dec 2001 20:29:33 +0100 (CET)
In-Reply-To: <F132VkFPTCyH8nsX6Rs00011e8e@hotmail.com> from "TypeR unknown" at Dec 28, 2001 07:15:13 PM
Reply-To: assembly-83@lists.ticalc.org


Simple,

pop a variable, directly after the label you called to, and you're in business.
though this only works if you haven't popped any vars on the stack before
calling

another approach (safer!!) is:
store the stack pointer to a safer location.
restore the stack pointer before calling...

at the start:
ld (stackvar),sp ; stackvar is a locationyou choose to be somewhere in saferam

at the place you want to exit:
ld sp,(stackvar)
ret

--Peter-Martijn

> 
> 
> Is it possible to make the calc "forget" it was busy doing a call, so that 
> when a ret command is given in a call the program returns to the TI-OS 
> rather than returning to the place where the call was made?
> 
> Thank you,
> 
>     Hasan Güdük
> 
> 
> 
> _________________________________________________________________
> Join the world’s largest e-mail service with MSN Hotmail. 
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References:

[A83] "forget" ret with calls ?

From: "TypeR unknown" <typerfuture@hotmail.com>

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