AArch64 MP+dmb.st+eret
{
[PTE(z)]=(oa:PA(z), valid:0);
0:X1=x; 0:X3=y;
1:X1=y; 1:X3=x; 1:X4=z;
}
P0 | P1 | P1.F ;
MOV W0,#1 |L0: | LDR W0,[X1] ;
STR W0,[X1] | LDR W5,[X4] | ADR X9,L1 ;
DMB ST |L1: | MSR ELR_EL1,X9 ;
MOV W2,#1 | LDR W2,[X3] | ERET ;
STR W2,[X3] | | ;
exists (1:X0=1 /\ 1:X2=0)