I decided to make a function that prints a string in the EAX register to the console, works from a part by displaying a message first, then something

Code (NASM) :

newLine equ 0xa

section .data
    msg db "Hello world!", newLine, 0

section .text
    global _start

_start:
    mov eax, msg
    call printf
    call exit

printf:
    push eax
    push ebx
    push ecx 
    push edx 

    mov ecx, eax
    call lenFind
    mov edx, eax
    mov eax, 4
    mov ebx, 1
    int 0x80

    pop edx
    pop ecx
    pop ebx
    pop eax 
    ret

lenFind:
    push edx
    mov edx, 0
    .find:
        cmp [eax+edx], byte 0
        je .close
        inc edx
        jmp .find
    .close:
        pop edx
        ret

exit:
    mov eax, 1
    mov ebx, 0
    int 80h 

Output:

Hello world!
.shstrtab.text.data
                   �J�  

idk what it could be, but most likely the problem is that I'm using 32 bit registers