> Its probably not the best way of going about things but I'm
>participating in a C implimentation of a micro-kernel who's syscalls in
>general have more then 4 arguments and return more then one. Its important
>to avoid copying. The ABI defines which registers are what and that all
>registers less the user SP are undefined after the syscall except where
>they are allocated for results from the syscall.
I don't quite understand what you're trying to do. Are you saying you want to
arrange for certain functions to have a non-standard calling sequence where
all regs are clobbered and a greater than usual number are used for args and
return values?
If so, this isn't possible without some hacking of the compiler. It wouldn't
be especially hard to add a new configuration with these quirks though. Under
Linux the compiler doesn't know anything at all about syscalls and the C
library does all the necessary magic.
If you can explain what the exact mechanism for syscalls under your kernel is,
that would probably help.
p.
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