--- VEX/priv/ir_defs.c.orig
+++ VEX/priv/ir_defs.c
@@ -1364,6 +1364,13 @@
       case Iop_2xMultU64Add128CarryOut: vex_printf("2xMultU64Add128CarryOut");
          return;
 
+#if defined(VGO_openbsd)
+      case Iop_MovFromSeg8 ... Iop_MovFromSeg64:
+         str = "MovFromSeg"; base = Iop_MovFromSeg8; break;
+      case Iop_MovToSeg8 ... Iop_MovToSeg64:
+         str = "MovToSeg"; base = Iop_MovToSeg8; break;
+#endif
+
       default: vpanic("ppIROp(1)");
    }
 
@@ -4156,6 +4163,12 @@
          QUATERNARY(Ity_I32, Ity_I8, Ity_I8, Ity_I8, Ity_I32);
       case Iop_Rotx64:
          QUATERNARY(Ity_I64, Ity_I8, Ity_I8, Ity_I8, Ity_I64);
+
+#if defined(VGO_openbsd)
+      case Iop_MovFromSeg64:
+      case Iop_MovToSeg64:
+         BINARY( Ity_I64, Ity_I64, Ity_I64 );
+#endif
 
       default:
          ppIROp(op);