Re: LZ: User stacks
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Re: LZ: User stacks
On Thu, 8 Aug 1996, Rob Taylor wrote:
>
> > On Tue, 6 Aug 1996, Eric C. Jensen wrote:
> >
> > > Can someone explain how to define your own stacks??? I think I have
> > > some idea, but I don't quite know. Do you allocate memory and then
> > > allocate a seperate variable to be a stack pointer to manipulate it?
> >
> > Basically, you decide where you want the new stack to be, and you load
> > it's address in SP and you have a new stack. You also need to save
> > the old value of SP in most systems, and restore it before your program
> > exits. I'm not sure if that's true of the TI.
> >
> yes you need to restore the stack.
> (how else would your final ret return to zshell if you didn't????)
In CP/M programs you terminate your program with JP 0. There is no
return to CP/M. When CP/M loads your program it makes no assumptions
about how you return. You can do a CALL 0 if you choose. CP/M does a
warm start so nothing is hurt.
Barry
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