@ My first ARM assembly program!
	.syntax unified
        @ this gives me illegal instructions in qemu: .cpu cortex-m4
        .code 16
        .thumb_func
        .globl main
main:   push {r4, lr}  @ guarantee 8-byte alignment in case of ldrd/strd
        ldr r0, =histr
        bl printf
        movs r0, #0
        pop {r4, pc}
        .data
histr:  .asciz "hello, world\n"