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In lugnet.robotics.rcx.legos, Michael Purvis wrote:
> In lugnet.robotics.rcx.legos, Iain McInnes wrote:
> > 1) Pass the variable to a function - the first function argument seems to be r0.
>
> I need to access elements of a 2d array. I don't think this is an option for
> that. Nevertheless, could you post code that demonstrates this?
>
> > You can easily experiment with this by inspecting the assembler output from gcc.
>
> How do I do that?
>
> > 2) Figure out the assembler idiom for referring to symbols and use that.
>
> ???
>
> > 3) I spent a bit of time surfing around the existing code, and there seems to be
> > an assembler macro idiom where variables can be pasted directly into the
> > assembler. I was too lazy to find the documentation on how to use it, but
> > someone might post here to tell you ;)
>
> Hmm... this sounds more like what I'm trying to do. Someone?
Hi Mike,
Check out the source for memcpy.c in the C library. It's not immediately clear,
but the directives at the end of the __asm__ section beginning with "r"
associate the %n macros with the given variables. I'm not sure of the exact
syntax of these, it appears the 3 lines may be necessary, I never really
experimented with it.
http://cvs.sourceforge.net/viewcvs.py/*checkout*/brickos/brickos/lib/c/memcpy.c?content-type=text%2Fplain&rev=1.2
HTH
ROSCO
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Message is in Reply To:
 | | Re: BrickOS Assembler
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| (...) I need to access elements of a 2d array. I don't think this is an option for that. Nevertheless, could you post code that demonstrates this? (...) How do I do that? (...) ??? (...) Hmm... this sounds more like what I'm trying to do. Someone? (...) (21 years ago, 18-Jan-04, to lugnet.robotics.rcx.legos)
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