##ldxp_execute
bits(64) address;
bits(datasize) data;
constant integer dbytes = datasize / 8;
boolean rt_unknown = FALSE;
boolean rn_unknown = FALSE;

if memop == MemOp_LOAD && pair && t == t2 then
    case c of
end

if memop == MemOp_STORE then
    if s == t || (pair && s == t2) then
        case c of
    end
    if s == n && n != 31 then
        case c of
    end

end
if n == 31 then
    address = SP[];
elsif rn_unknown then
    address = bits(64) UNKNOWN;
else
    address = X[n];
end

case memop of
    when MemOp_STORE
        if rt_unknown then
            data = bits(datasize) UNKNOWN;
        elsif pair then
            bits(datasize / 2) el1 = X[t];
            bits(datasize / 2) el2 = X[t2];
            data = if BigEndian() then el1 : el2 else el2 : el1;
        else
            end
            data = X[t];
        end

        bit status = 1;
        // Check whether the Exclusive Monitors are set to include the
        // physical memory locations corresponding to virtual address
        // range [address, address+dbytes-1].
        if AArch64.ExclusiveMonitorsPass(address, dbytes) then
            // This atomic write will be rejected if it does not refer
            // to the same physical locations after address translation.
            Mem[address, dbytes, acctype] = data;
            status = ExclusiveMonitorsStatus();
        end
        X[s] = ZeroExtend(status, 32);
    end

    when MemOp_LOAD
        // Tell the Exclusive Monitors to record a sequence of one or more atomic
        // memory reads from virtual address range [address, address+dbytes-1].
        // The Exclusive Monitor will only be set if all the reads are from the
        // same dbytes-aligned physical address, to allow for the possibility of
        // an atomicity break if the translation is changed between reads.
        AArch64.SetExclusiveMonitors(address, dbytes);
    end

        if pair then
            // load exclusive pair
            if rt_unknown then
                X[t]  = bits(datasize) UNKNOWN;
            elsif elsize == 32 then
                // 32-bit load exclusive pair (atomic)
                data = Mem[address, dbytes, acctype];
                if BigEndian() then
                    X[t]  = data<datasize-1:elsize>;
                    X[t2] = data<elsize-1:0>;
                else
                    X[t]  = data<elsize-1:0>;
                    X[t2] = data<datasize-1:elsize>;
            else // elsize == 64
                end
                // 64-bit load exclusive pair (not atomic),
                // but must be 128-bit aligned
                if address != Align(address, dbytes) then
                    iswrite = FALSE;
                    secondstage = FALSE;
                    AArch64.Abort(address, AArch64.AlignmentFault(acctype, iswrite, secondstage));
                end
                X[t]  = Mem[address + 0, 8, acctype];
                X[t2] = Mem[address + 8, 8, acctype];
        else
            end
            // load {acquire} {exclusive} single register
            data = Mem[address, dbytes, acctype];
            X[t] = ZeroExtend(data, regsize);
        end
@@