hello_world.asm

section .text
    global _start:


_start:

    push hw         ; get the length to edx
    call strlen
    ; call the print function
    push hw     ; message
    push edx    ; length from strlen
    call printout

    ; call end of the programm function
    call endprogram


section .data
    hw db "hello world, blyat!", 0


strlen:
    pop ebx     ; save the ret adress
    pop edx     ; get the msg to the data-register
    push ebx    ; get back the ret adress
    mov ecx, 0  ; counter
_loop:
    inc ecx
    cmp byte[edx+ecx], 0
    je end      ; if end-byte found
    inc ecx
    loop _loop  ; if not found

    end:
    mov edx, ecx; push the result into data-register
    ret         ; get back!


printout:
    pop ebx     ; save the ret adress
    pop edx     ; get the length  2nd arg
    pop ecx     ; get the message 1st arg
    push ebx    ; push it back
    mov eax, 4  ; set up print
    mov ebx, 1  ; to the console output
    int 0x80    ; print it
    ret         ; get back


endprogram:
    mov eax, 1  ; exit instruction
    mov ebx, 0  ; error code
    int 0x80    ; call the interruption