64-bit Variadic functions

[Vortex]

Here is a classical sample specifying the number of arguments :

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OPTION PROLOGUE:NONE
OPTION EPILOGUE:NONE

CalcSum PROC counter:QWORD,args:VARARG

;  mov    QWORD PTR [rsp+8],rcx
    mov    QWORD PTR [rsp+16],rdx
    mov    QWORD PTR [rsp+24],r8
    mov    QWORD PTR [rsp+32],r9

    xor    rax,rax
    lea    r10,[rsp+16]
@@: 
    add    rax,QWORD PTR [r10]
    add    r10,8
    dec    rcx
    jnz    @b

    retn

CalcSum ENDP


OPTION PROLOGUE:PrologueDef
OPTION EPILOGUE:EpilogueDef