PRESERVE8
THUMB
AREA |.text|, CODE, READONLY
EXPORT __main

__main
    LDR R0, =0x20000000
    LDR R1, =0x20000100
    MOVS R2, #10
swap_loop
    LDRB R3, [R0]
    LDRB R4, [R1]
    STRB R4, [R0]
    STRB R3, [R1]
    ADDS R1,R1,#1
    ADDS R0,R0,#1
    SUBS R2,R2,#1
    BNE swap_loop
STOP
    B STOP
END