--- np2/i386c/ia32/exception.c	2011/01/15 18:36:12	1.23
+++ np2/i386c/ia32/exception.c	2011/12/17 02:23:35	1.24
@@ -277,10 +277,6 @@ interrupt(int num, int intrtype, int err
 			VERBOSE(("interrupt: gate descripter is invalid."));
 			EXCEPTION(GP_EXCEPTION, exc_errcode);
 		}
-		if (!SEG_IS_PRESENT(&gsd)) {
-			VERBOSE(("interrupt: gate descriptor is not present."));
-			EXCEPTION(GP_EXCEPTION, exc_errcode);
-		}
 		if (!SEG_IS_SYSTEM(&gsd)) {
 			VERBOSE(("interrupt: gate descriptor is not system segment."));
 			EXCEPTION(GP_EXCEPTION, exc_errcode);
@@ -300,17 +296,17 @@ interrupt(int num, int intrtype, int err
 			break;
 		}
 
-		if (gsd.dpl < CPU_STAT_CPL) {
-			VERBOSE(("interrupt: gate DPL(%d) < CPL(%d)", gsd.dpl, CPU_STAT_CPL));
-			EXCEPTION(GP_EXCEPTION, exc_errcode);
-		}
-
 		/* 5.10.1.1. 例外／割り込みハンドラ・プロシージャの保護 */
 		if ((intrtype != INTR_TYPE_EXTINTR) && (gsd.dpl < CPU_STAT_CPL)) {
 			VERBOSE(("interrupt: intrtype && DPL(%d) < CPL(%d)", gsd.dpl, CPU_STAT_CPL));
 			EXCEPTION(GP_EXCEPTION, exc_errcode);
 		}
 
+		if (!SEG_IS_PRESENT(&gsd)) {
+			VERBOSE(("interrupt: gate descriptor is not present."));
+			EXCEPTION(NP_EXCEPTION, exc_errcode);
+		}
+
 		if (!intrtype && CPU_STAT_HLT) {
 			CPU_EIP++;
 			CPU_STAT_HLT = 0;