Re: A89: gettin' started

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Re: A89: gettin' started


Actually, I am pretty sure that what is really done is that each library
reference is replaced with a call to the OS with the function number as an
argument of some sort. then, the OS finds the library (if available) looks
in its function offset table, and jumps to the correct function in the
library code.  This is proven by the fact that you never have to code
anything that says: "This program needs library so and so to run" and abort.
This is done in the OS's library calling code if the library can't be found.

--kaus

----- Original Message -----
From: Scott Dial <wrath@calc.org>
To: <assembly-89@lists.ticalc.org>
Sent: Wednesday, December 29, 1999 10:06 PM
Subject: Re: A89: gettin' started


>
> I have a question about this too, the way I have seen this done is using
> a static location to jump to that jumps to the dynamic one. But, it
> obviously comes up with the address during linking or whatever which
> makes no sense to me because it can never be in the same spot. So how is
> this done?
>
> Cassady Roop wrote:
> >
> > so does the library have to be on the calculator for the program to
> > run?  If so, then how is it so simple to reference a library call if the
> > library is a variable separate from the program?
> >
> > Cassady Roop
> >
> > KeysDezes@aol.com wrote:
> > >
> > > <A
HREF="http://calccity.calc.org/tiweekly/Articles/Beginners_TI89_ASM.html">B
> > > eginners Guide to TI-89/92+ Assembly</A>
> > > By far, the most comprehensive guide to 68k asm that I've seen.
> > > Libraries are sets of routines that can be accessed by asm programs.
The
> > > advantage of libraries is that they are shared by all programs.  They
contain
> > > common routines such as PutSprite and clr_scr.
>
> --
> Scott "_Wrath_" Dial
> wrath@calc.org
> ICQ#3608935
> TimeCity AI Guy II - www.timecity.org
> Member of TCPA - tcpa.calc.org
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