SO78838831 - ver2

Include irvine32.inc

;irvine32.inc already uses this directive for us:
;    .model flat, STDCALL

.data
    result DWORD ?

.code

add_func PROC C a:SDWORD, b:SDWORD
; SDWORD type is a signed 32-bit value

    ; When parameters are specifiec with PROC push ebp and mov ebp, esp
    ; prologue are done automatically

    ; Get the arguments
    mov eax, a
    mov ecx, b

    ; Add a and b
    add eax, ecx

    ; Store the result in a variable
    mov result, eax

    call WriteInt

exit_function:

    ; Return the result in EAX
    mov eax, result
    ; When a RET instruction is found by MASM inside a PROC
    ; defined function proper epilogue code
    ; will be emitted (restoring ESP from EBP etc). If STDCALL
    ; calling convention is declared with PROC the RET will be
    ; modified by MASM so that it removes the specified number of
    ; byte from the stack based on the arguments defined by PROC.
    ; With CDECL this will just be a RET instruction.
    ret

add_func ENDP

END