[A83] Re: program pointers [83]
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[A83] Re: program pointers [83]
I've been running TASM on my Windows CE HP Jornada 680 under a 186
emulator, and it works (slowly). Also, there is a linux kernal that will
run on this platform as well, called ELKS. There aren't many programs for
it, though. I think it was mostly a "because I can" project, not
something useful... It runs Vi, and not much else.....
On Sun, 4 Mar 2001, Henk Poley wrote:
>
> [Joe Pemberton wrote]
> > [Henk Poley wrote]
> > >I need to know the end of the program (that's running). If I'm right I
> > >can find this by reading the first pointer to a file from the VAT:
> > >
> > > ld hl,(PROGPTR - 2) ;HL = end_of_program
> > >
> > >Am I right? Or can there be other variables (like reals, GDBs, pictures,
> > >etc.) directly after the executing program? If so, how should I
> > >get a pointer to the end of my program?
> > >
> > >And NO, it can't be done via a simple "end_of_program:" at the end of
> > >my assembly file. Because I'm using a different assembler (one with a
> > >linker)and files get linked after the main routine).
> > >
> > > Henk Poley
> >
> >
> > if you're gonna do it the hard way, couldn't you just do a
> > bcall(_chkfindsym) with your programs name in op1 and get a pointer to
> > the data? The first two bytes of your program are it's size. so all you
> > would have to do is take that and add $9d95 to get it's offset when it is
> > running.
> > btw why aren't you using TASM?
>
> Uhm, I'm going to make a malloc() routine (Ti-83) for the z88dk
> (a C compiler). That compiler uses Z80ASM as assembler:
>
> 1. Because it can make relocatable files, which (can) get linked via the
> (built-in) linker. C without a linker can be done (see ti8xcc) but isn't
> quite 'standard'. And I can't force the people who make it to use another
> assembler (without a linker)... ;)
>
> 2. Z80ASM is open source, in contrary to TASM, which is closed source and
> has only been released for DOS (for a 80286 or higher, I think).
>
> The z88dk runs under:
> -- *nix (unix, Linux, solaris, etc),
> -- DOS (MS DOS, Dr. DOS, OpenDOS, FreeDOS, etc),
> -- Windows (all versions, as long you can run a DOS program within it) and
> -- Amiga.
> On all types of processors, as long a you can find a C compiler for that,
> and you are running one of the operating systems I mentioned above. (on
> that
> system...)
>
> Why would you do a slow call to _chkfindsym if you have a pointer (to the
> end of your program) at a fixed point in memory?
> (At least, I hope it's there...)
>
> Another thing: I should store the name of my program inside my program, in
> order to be able to use _chkfindsym... (would need a compiler-hack)
>
> But can anyone tell me if I'm right?
>
> Henk Poley
>
>
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