NASM - x32Bit - Windows

;Print "Hello, World!" - Windows - x32bit ONLY - NASM
;nasm -fwin32 print.asm -o print.obj
;golink /console /entry WinMain print.obj kernel32.dll

global WinMain ;Defines entrypoint as "WinMain"
extern GetStdHandle, WriteConsoleA ;Imports GetStdHandle and WriteConsoleA from kernel32.dll
STD_OUTPUT_HANDLE   equ -11 ;Assigns value -11 to STD_OUTPUT_HANDLE
NULL                equ 0 ;Assigns value 0 to NULL

section .data ;Defines constants/variables
    msg                 db "Hello World!", 13, 10, 0 ;Defines message in appropriate C format
    msg.len             equ $ - msg ;Defines constant message length

section .bss ;Defines bytes for optimisation
    dummyByte           resd1 ;Assigns 4bytes to dummyByte

section .text ;Define code
    push                STD_OUTPUT_HANDLE ;Push STD_OUTPUT_HANDLE to stack
    call                GetStdHandle ;Call GetStdHandle from kernel32.dll using 1st parameter in stack
    push                NULL ;Push Null to stack
    push                dummyByte ;Push the 4bytes to stack
    push                msg.len ;Push msg.len (buffer) to stack
    push                msg ;Push msg to stack
    push                eax ;Push accumulator result from GetStdHandle
    call                WriteConsoleA ;Calls the external function
    jmp                 $ ;Keeps console open after printing

;WriteConsoleA has parameters in the order of Null, dummyByte, msg.len, msg, GetStdHandle(eax)
;WriteConsoleA(eax, msg, msg.len, dummyByte, NULL)