Need some Help: FrameScript_RegisterFunction in x64 WOW

[hb123220]

first,plz forgive my poor English~

FrameScript_RegisterFunction = 0x140083820 ( NOT Rebase, [5.4.1 17538] Release x64)

x86 version,pretty easy and works fine for me!

INT_PTR __cdecl  FrameScript__RegisterFunction (const char* Name, INT_PTR(__cdecl* scriptFunction)(UINT_PTR)) 

x64 version:

INT_PTR  FrameScript__RegisterFunction (const char* Name) 

it's so strange,it passes only one parameter(rcx) ???

here is the caller:

sub_140750B60 proc near

arg_0= qword ptr  8

mov     [rsp+arg_0], rbx
push    rdi
sub     rsp, 20h
lea     rbx, off_1411E9620
mov     edi, 4
mov     rcx, [rbx]
call    FrameScript_RegisterFunction
add     rbx, 10h
dec     rdi
... 

i'v try something like that ,but don't work

struct FrameScript__RegisterFunction_Arg
{
    const char* FunctionName;
    INT_PTR funcPtr;
};
INT_PTR  FrameScript__RegisterFunction (FrameScript__RegisterFunction_Argchar  arg) 

or try masm,also failed..

.data 
F_FrameScript_RegisterFunction dq 0140083820h

.code
PUBLIC ASM_FrameScript__RegisterFunction
ASM_FrameScript__RegisterFunction PROC
mov rbx,rdx
sub    rsp, 20h
call F_FrameScript_RegisterFunction
add    rsp, 20h
RET        
ASM_FrameScript__RegisterFunction ENDP

End

then use it in c++
extern "C" INT_PTR  ASM_FrameScript__RegisterFunction (const char* name, FrameScript__RegisterFunction_Arg arg); 

can anyone give me some advice plz, thanks in advance!

[szKaXo]

FrameScript_RegisterFunction = 0x837D0

[hb123220]

thx,i just figure it out