Run S+dsbs in model, using armmem
ARM S+dsbs "DSBdWW Rfe DSBdRW Wse" Cycle=Rfe DSBdRW Wse DSBdWW { %x0=x; %y0=y; %y1=y; %x1=x; } P0 | P1 ; MOV R0, #2 | LDR R0, [%y1] ; STR R0, [%x0] | DSB ; DSB | MOV R1, #1 ; MOV R1, #1 | STR R1, [%x1] ; STR R1, [%y0] | ; exists (x=2 /\ 1:R0=1)