- add r1, r1, r0, lsr #3 @ Get byte offset
- and r3, r0, #7 @ Get bit offset
- mov r0, #1
- save_and_disable_irqs ip, r2
- ldrb r2, [r1]
- tst r2, r0, lsl r3
- orr r2, r2, r0, lsl r3
- strb r2, [r1]
- restore_irqs ip
- moveq r0, #0
- RETINSTR(mov,pc,lr)
-
-