Can't pass parameters to function in assembly x86

Question

I'm trying to pass a string and it's length to the registers ecx and edx through the stack, but i'm getting a segmentation fault:

global main

section .data
        var db "this is the message",0
        varlen equ $- var

section .text

print:
        mov  eax, 4
        mov  ebx, 1
        mov  ecx, [ebp + 4]
        mov  edx, [ebp + 8]
        int 0x80

        ret

main:
        push varlen
        push var
        call print

        mov  eax, 1
        mov  ebx, 0
        int 0x80

Answer 1

If you want, your function to have prologue and epilogue, do the following:

print:
    push ebp
    mov  ebp, esp
    mov  eax, 4
    mov  ebx, 1
    mov  ecx, [ebp + 8]
    mov  edx, [ebp + 12]
    int  0x80
    mov  esp, ebp
    pop  ebp
    ret

otherwise:

print:
    mov  eax, 4
    mov  ebx, 1
    mov  ecx, [esp + 4]
    mov  edx, [esp + 8]
    int  0x80
    ret

and in your main:

main:
    push varlen
    push var
    call print
    add  esp, 8
    mov  eax, 1
    xor  ebx, ebx
    int 0x80