.text
.org 0x20
stev1:  .word 0x00000001
stev2:  .word 0x00000002

.global _start
_start:

  adr   r0, stev1
  ldrh  r1, [r0]

  adr   r0, stev2
  ldrh  r2, [r0]

  adr   r0, stev1
  str   r2, [r0]

  adr   r0, stev2
  str   r1, [r0]