The parameter list format passed by FASTLINK C++ is identical to that built in the argument area of an XPLINK caller. In both the FASTLINK and XPLINK cases, some parameters may be passed in registers, although the rules differ about which registers get loaded and when. In the FASTLINK case, any remaining parameters not passed in registers are passed in an argument area at a fixed location in the callee's stack frame. In the XPLINK case, remaining parameters are passed in an argument area at a fixed location in the caller's stack frame.