Nouveau - Nov 2007 - nv50 microcode/shader format

Hello there,

With the use of CUDA and ptx I managed to make a disassembler for at least
one of the nv50 microcode/shader formats. This might come in handy for some
people, hence I'm posting it here:

http://www.cs.rug.nl/~wladimir/decuda/

I'm not yet sure if pixel/vertex shaders use the same instruction format as
the compute shaders used by CUDA, but you'd think so, as nv50 is supposed to
have unified shader units. If anyone can help me a bit in finding the shader
instructions in valgrind-mmt-extend of mmiotrace dumps that'd be a great
help. I haven't had much luck yet with that. Is there a way to "pretty
print" the output of those programs, I mean, fill in the registers already
known?

Greetings,
Wladimir J. van der Laan
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I can answer myself here, as I finally managed to dump the shader as sent to
the card: yes, the shader binary format used for vertex, fragment and
geometry shaders on the G80 is the same as the cubin for CUDA. There appear
to be some special instructions that are used to read input and write output
registers absent from CUDA. Apart from those, decuda will be a good start if
someones decides to tackle NV50 shaders in Nouveau.

Wladimir

On Nov 11, 2007 10:04 PM, Wladimir van der Laan <laanwj at gmail.com>
wrote:
> Hello there,
>
> With the use of CUDA and ptx I managed to make a disassembler for at least
> one of the nv50 microcode/shader formats. This might come in handy for some
> people, hence I'm posting it here:
>
>
http://www.cs.rug.nl/~wladimir/decuda/<http://www.cs.rug.nl/%7Ewladimir/decuda/>
>
> I'm not yet sure if pixel/vertex shaders use the same instruction
format
> as the compute shaders used by CUDA, but you'd think so, as nv50 is
supposed
> to have unified shader units. If anyone can help me a bit in finding the
> shader instructions in valgrind-mmt-extend of mmiotrace dumps that'd be
a
> great help. I haven't had much luck yet with that. Is there a way to
"pretty
> print" the output of those programs, I mean, fill in the registers
already
> known?
>
> Greetings,
> Wladimir J. van der Laan
>
>
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