Raspberry Pi Hello World in Assembly

[jovan_raspberrypi]

I tried to compile this assembly program for printing "Hello World" on our Raspberry Pi server. It prints out the string but then gives me a segfault. Anybody know why?

@ hello.s
@ D. Thiebaut
@ Just your regular Hello World program!

@
@ Data Section
@

.data
string: .asciz "\nHello World!\n"

@
@ Code Section
@

.text
.global main
.extern printf

main:
push {ip, lr}
ldr r0, =string
bl printf

@ To Compile:
@ as -o hello.o hello.s
@ gcc -o hello hello.o