chdir command

I can not get system call #12 to work as advertised. In Read Hat Linux 7.2 under bash using nasm with elf I write:

section .text
global _start

path db '/root',0

_start:

    mov ebx, path
    mov eax,12
    int 80h

    mov eax, 1
    int 80h        ;; int 0x80

Although I have gotten system calls 1, 3-6 & 11 to work fine in assembly programs, I can not get the change-working-directory call to work.

Thanks, Al ([email protected])