first.s

.global main

main:
        mov r0, #2
        bx lr

gistfile1.txt

root@vultr:~/arm# cat Makefile
.PHONY: always_run

%.exe: %.s always_run
        @arm-linux-gnueabihf-gcc -static -o $@ $<
        @-qemu-arm-static $@; echo $$?
        @rm -f $@
root@vultr:~/arm# cat hello.s
greeting:
        .asciz "Hello ARM"

.text

.global main
main:
        ldr r0, address_of_greeting
        push {lr}
        bl puts
        pop {lr}
        mov r0, #0
        bx lr

address_of_greeting: .word greeting
.global puts
root@vultr:~/arm# cat first.s
.global main

main:
        mov r0, #2
        bx lr

hello.s

greeting:
        .asciz "Hello ARM"

.text

.global main
main:
        ldr r0, address_of_greeting
        push {lr}
        bl puts
        pop {lr}
        mov r0, #0
        bx lr

address_of_greeting: .word greeting
.global puts

Makefile

.PHONY: always_run

%.exe: %.s always_run
        @arm-linux-gnueabihf-gcc -static -o $@ $<
        @-qemu-arm-static $@; echo $$?
        @rm -f $@