Subject:
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Re: signals / legOS internals
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Wed, 23 Jun 1999 01:40:05 GMT
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Viewed:
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1076 times
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Kekoa Proudfoot wrote:
>
> Reading this again, I should mention that pushing things on the stack
> asynchronously is fine, as long as the stack pointer is always in the right
> place, which is why it must always always always point to the location I
> mentioned (and seemingly the location you also knew about).
>
> Your misunderstanding is probably with regard to what a "push" operation
> does. It moves the stack pointer down, not up -- down into free space.
> There is no problem.
I may have down and up reversed, since different machines grow the stack
upward or downward, and I've worked with a few. I do have push and pop
clear in my mind, though.
So, yeah, down. So, by the "always" rule, nothing will ever be below
the stack pointer until such time as it is pushed there.
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Message is in Reply To:
 | | Re: signals / legOS internals
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| (...) Reading this again, I should mention that pushing things on the stack asynchronously is fine, as long as the stack pointer is always in the right place, which is why it must always always always point to the location I mentioned (and seemingly (...) (25 years ago, 23-Jun-99, to lugnet.robotics.rcx.legos)
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