Subject:
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Re: How to make your own assembly code position independant
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 8 Jun 1999 23:23:45 GMT
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Original-From:
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Charles Hacker EAS <C.Hacker@ste.gu.edu.*ihatespam*au>
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Reply-To:
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C.Hacker@mailbox.gu.edu.&nospam&au
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Viewed:
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3364 times
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Marobi,
Do not know much about IC and assembly code downloading.
However, I have produced a system for programming the HandyBoard with
Assembly/machine code. This system may help you.
It can be downloaded from:
http://132.234.46.5/Programs/HBoard/Index.shtml
> Hi,
>
> I am currently trying to get some existing assembly code (not written by me) loaded into the HB.
> It loads fine, but everything gets messed up after running it.
> The exact addresss of this code is not known at the time of assembly and IC just loads it in memory
> after the stuff that it already loaded.
> This means code needs to be position independant ( or does IC have a kind of loader ??)
> What are the 'mistakes' to make code dependant on its position in memory and how to solve ?
>
> Can anybody shine some light on it ?
> I even do not exactly understand the example in the HB manual on installing an interrupt routine of your own.
> This code uses the construct of 'LDD #interrupt_code_start, STD TOC4INT,X'. I know it works but ....
> #interrupt_code_start is just an address generated during assembly, which is a 'fictive address'.
> The begin address of this interrupt-routine as stated during assembly is not the same as the load address when loaded.
> How does this stuff work ?
>
> I am stuck. It works but I do not exactly understand how.
>
> Please help ......
>
>
> Rien
> rien@direct.A2000.nl
Charles Hacker
Lecturer in Electronics, Computing and Physics
School of Engineering
Griffith University - Gold Coast
PMB 50 Gold Coast Mail Centre
Southport Queensland 9726
Australia.
Email - C.Hacker@mailbox.gu.edu.au
Ph. (07) 5594 8670
Fax.(07) 5594 8065
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