disassembly will stop decoding on unknown opcode but will return "true"

this means that the sequence is allowed but that particular opcode is
not allowed

Author: JetSetIlly

disassembly/decode.go

@@ -163,6 +163,8 @@ func (dsm *Disassembly) blessSequence(b int, a uint16, commit bool) bool {
 	// program counter style (ie. address plus instruction byte count)
 	//
 	// sequence will stop if:
+	//  . an unknown opcode has been encountered
+	//
 	//  . there is already blessed instruction between this and the next entry
 	//
 	//  . a flow control instruction is encountered (this is normal and expected)
@@ -175,6 +177,12 @@ func (dsm *Disassembly) blessSequence(b int, a uint16, commit bool) bool {
 			return true
 		}
 
+		// if operator is unknown than end the sequence.
+		operator := dsm.entries[b][a].Result.Defn.Operator
+		if operator == "??" {
+			return true
+		}
+
 		next := a + uint16(dsm.entries[b][a].Result.ByteCount)
 
 		// break if address has looped around