Lennart Sorensen wrote:
On Thu, Dec 20, 2007 at 04:27:37PM -0500, linux-os (Dick Johnson) wrote:
I need to get rid of -mregparm=3 on gcc's command line. It
is completely incompatible with the standard calling conventions
used in all our assembly-language files in our drivers. We make
very high-speed number-crunching drivers that munge high-speed
data into images. We need to do that in assembly as we have
always done.
Well I guess you can either fix the assembly once and for all to handle
the current linux way of doing things, or you can patch to kernel back
to the old ways of doing things when using your driver.
I suppose you could just add some wrapper functions to your assembly
that uses the new regparm calling method and then calls your methods the
old way and selectively enable those when regparm is used by the kernel
if you want to support all kernel versions. Or you could use inline
assembly in C functions to handle the calling convention for you.
If I were to guess, based on nothing but what's in this thread, people
who write modules in assembler would want to avoid the the wrapper
overhead. Of course putting image processing in the kernel at all
instead of user programs is not something I ever do...
--
Bill Davidsen <[email protected]>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot
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