T_DATA_PROT
if (ctxtype != INVALID_CONTEXT && traptype != T_DATA_PROT) {
case T_DATA_PROT + T_USER:
case T_DATA_PROT: /* system data protection fault */
case T_DATA_PROT:
case T_DATA_PROT + T_USER: /* user data protection fault */
case T_DATA_PROT + T_USER: