--- nono/m88xx0/m88100subr.cpp	2026/04/29 17:04:34	1.1.1.2
+++ nono/m88xx0/m88100subr.cpp	2026/04/29 17:04:41	1.1.1.4
@@ -48,3 +48,50 @@ m88kcpu::SetVersion(uint32 version)
 	"111-", // not used normally
 	"LLLL",
 };
+
+// 例外
+/*static*/ const char * const m88kcpu::exception_names[] = {
+			//   01234567890123456789012 <- 例外履歴欄の横幅
+	/*  0 */	"Reset Exception",
+	/*  1 */	"Interrupt Exception",
+	/*  2 */	"Inst Access Exception",
+	/*  3 */	"Data Access Exception",
+	/*  4 */	"Misaligned Access Excep",
+	/*  5 */	"Unimplemented Opcode",
+	/*  6 */	"Priv. Violation Excep.",
+	/*  7 */	"Bounds Check Violation",
+	/*  8 */	"Illegal Integer Divide",
+	/*  9 */	"Int Overflow Exception",
+	/* 10 */	"Error Exception",
+			//   01234567890123456789012
+};
+
+// 例外名を返す。
+// Reserved なところは NULL を返す。
+// XXX TODO 114 以降未実装
+/*static*/ const char *
+m88kcpu::GetExceptionName(int vector)
+{
+	if (0 <= vector && vector < countof(exception_names)) {
+		return exception_names[vector];
+	}
+
+	// OpenBSD
+	// XXX 本来は OpenBSD 稼働時に限定すべきだろうけど、そうする意味もない
+	switch (vector) {
+	 case 450:
+		return "OpenBSD system call";
+	 case 451:
+		return "OpenBSD cache flush";
+	 case 503:
+		return "Division by zero in GCC";
+	 case 504:
+		return "OpenBSD stepbpt";
+	 case 511:
+		return "OpenBSD userbpt";
+	 default:
+		break;
+	}
+
+	return NULL;
+}