Re: A89: ASM exectution questions

To: assembly-89@lists.ticalc.org
Subject: Re: A89: ASM exectution questions
From: "Michael S. Davis" <ipscone@halcyon.com>
Date: Mon, 18 Jan 1999 09:24:52 -0800 (PST)
Delivered-To: assembly-89-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-89@lists.ticalc.org
In-Reply-To: <199901171939.UAA19848@kleopatra.acc.umu.se>
Reply-To: assembly-89@lists.ticalc.org



Thanks, I had another question but you answered that indirectly also.
I was wondering about how the relocation would be handled if one archived
a program then unarchived it again.  If programs are run im place then
archiving and unarchiving would move the location in executable RAM.  But
since the 'stub' is what does the relocation, then it is automatically
taken care of each time the prgram is executed.

Thanks

On Sun, 17 Jan 1999, Jimmy [iso-8859-1] Mårdell wrote:

> 
> At 08:20 1999-01-17 -0800, you wrote: 
> >TI89 Question:
> >
> >When one executes an assebmly program, is it copied from it's storage
> >location to an execution area (like in the TI86) or, is it just executed
> >where it is saved?
> 
> It's executed on the spot.
> 
> >When a program is compiled, the absolute locations of variables and/or
> >subroutines is not know. If using relative addressing, this is not a
> >problem but many instructions use absolute addresses. Those locations are
> >resolved during relocation.  
> >
> >Where is this done?  I think it is done with the kernel, if using Doors or
> >PlusShell, but if not using those, where or how is that accomplished?
> 
> Usually by the shell when executing the program (Fargo, DoorsOS)
> 
> >Others have said it is possible to write an assembly program that does not
> >require either Doors or PlusShell, but if not using them where or how are
> >these symbol locations resolved?
> 
> When compiling a PlusShell program, it adds a bit of prewritten code
> at the begging (called a "stub") which does the relocation. The code
> ain't big, less than 100 bytes I believe.
> 
> My guess is that since asm programs are supported on the 89, there
> is some builtin function for this in the ROM which does something
> similiar. It would be strange to support asm else...
> 
> //Jimmy Mårdell
> 
> E-mail: yarin@acc.umu.se
> Homepage: http://www.acc.umu.se/~yarin/
> 
> 
> 

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Re: A89: ASM exectution questions

From: Jimmy =?iso-8859-1?Q?M=E5rdell?= <yarin@acc.umu.se>