T_OVFLW
{ T_OVFLW, "into-overflow" },
case T_OVFLW + USER: /* integer overflow */
{ T_OVFLW, 0, kdi_trap4, NULL },
set_gatesegd(&idt[T_OVFLW],
KCS_SEL, SDT_SYSIGT, TRP_UPL, idt_vector_to_ist(T_OVFLW));