windows - Push an argument into stack? -


i know first 4 arguments in register (rcx, rdx, r8, r9), , additional arguments pushed on stack.

question:

how push argument onto stack? tried (push 0) not work?

code (masm64)

extrn exitprocess: proc    extrn messageboxexa: proc .data caption db '64-bit hello!', 0 message db 'hello world!', 0 .code start proc   sub    rsp, 38h           mov    rcx, 0         ; hwnd = hwnd_desktop   lea    rdx, message   ; lpcstr lptext   lea    r8,  caption   ; lpcstr lpcaption   mov    r9d, 0         ; utype = mb_ok    push   0          ; wlanguageid    call   messageboxexa     mov    ecx, eax          add    rsp, 38h   call exitprocess start endp end

i'm know messagebox , messageboxex work same way, im trying use messageboxex because need 1 parameter passed (for learning purpose).

i know i've asked similar question, more related vb.net while not.

my assembly little rusty, under impression arguments went onto stack (in reverse order) - i'd have thought want pushing r8 , rdx in other arguments. frankly though might keep doing lea rax, param , push rax each of arguments pointers.


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