Passing function arguments in registers

[Jeffrey A Law]

  In message < 199710142047.JAA17466@ongaonga.chch.cri.nz >you write:
  > Jeffrey A Law writes:
  >  > What exactly are the calling conventions for this target?
  > 
  > The register allocation order is  AR2, R2, R3, RC, RS, RE (then stack).
  > 
  > However, the first and second floating point values are always in R2
  > and R3 (and all other floats are on the stack).  Structs are always
  > passed on the stack.
So, say you want to pass int, int, int, float, float, int (A, B, C, D, E, F).

Do you pass them as:

AR2 = A
R2 = D
R3 = E
RC = B
RS = C
RE = F

?

Weird.

How does your target implement varargs & stdarg?  I don't really see a
good way to correctly implement them if I understand the calling conventions
correctly.

jeff