Christian Groessler <cpg@aladdin.de> writes:

> Hi,
> 
> I'm currently digging a bit into assembly programming on the DC / SH.
> 
> Is there somewhere a documentation about the calling conventions used
> on NetBSD (probably it's a gcc definition)?
> 
> Specifically I want to know
>         - which registers are used for function parameters

r4-r7 contain the first four parameters.  Remaining parameters are
passed on the stack.

>         - which registers contain function return values

r0

>         - which registers need to be preserved across function calls

r8-r15.


This is assuming you're not using floating-point.


  // Marcus