--- nono/m88xx0/m88100.h	2026/04/29 17:05:26	1.1.1.15
+++ nono/m88xx0/m88100.h	2026/04/29 17:05:56	1.1.1.17
@@ -6,9 +6,7 @@
 
 #pragma once
 
-#include "nono.h"
-
-class MPU88xx0Device;
+#include "header.h"
 
 // 定数。
 struct M88100
@@ -195,27 +193,62 @@ struct M88100
 	static const uint32 FPCR_EFOVF	= 0x00000002;	// Enable Overflow
 	static const uint32 FPCR_EFINX	= 0x00000001;	// Enable Inexact
 
-	// 例外
-	static const uint32 EXCEP_RESET			= 0;
-	static const uint32 EXCEP_INTERRUPT		= 1;
-	static const uint32 EXCEP_INST			= 2;
-	static const uint32 EXCEP_DATA			= 3;
-	static const uint32 EXCEP_MISALIGNED	= 4;
-	static const uint32 EXCEP_UNIMPL_OP		= 5;
-	static const uint32 EXCEP_PRIV			= 6;
-	static const uint32 EXCEP_BOUNDS		= 7;
-	static const uint32 EXCEP_INT_DIV		= 8;
-	static const uint32 EXCEP_INT_OVF		= 9;
-	static const uint32 EXCEP_ERROR			= 10;
-
-	static const uint32 EXCEP_SFU1_PRECISE	= 114;
-	static const uint32 EXCEP_SFU1_IMPRECISE= 115;
-	static const uint32 EXCEP_SFU2_PRECISE	= 116;
-	static const uint32 EXCEP_SFU3_PRECISE	= 118;
-	static const uint32 EXCEP_SFU4_PRECISE	= 120;
-	static const uint32 EXCEP_SFU5_PRECISE	= 122;
-	static const uint32 EXCEP_SFU6_PRECISE	= 124;
-	static const uint32 EXCEP_SFU7_PRECISE	= 126;
+	// 例外ベクタ。
+	static const uint32 EXCVEC_RESET			= 0;
+	static const uint32 EXCVEC_INTERRUPT		= 1;
+	static const uint32 EXCVEC_INST				= 2;
+	static const uint32 EXCVEC_DATA				= 3;
+	static const uint32 EXCVEC_MISALIGNED		= 4;
+	static const uint32 EXCVEC_UNIMPL_OP		= 5;
+	static const uint32 EXCVEC_PRIV				= 6;
+	static const uint32 EXCVEC_BOUNDS			= 7;
+	static const uint32 EXCVEC_INT_DIV			= 8;
+	static const uint32 EXCVEC_INT_OVF			= 9;
+	static const uint32 EXCVEC_ERROR			= 10;
+	static const uint32 EXCVEC_SFU1_PRECISE		= 114;
+	static const uint32 EXCVEC_SFU1_IMPRECISE	= 115;
+	static const uint32 EXCVEC_SFU2_PRECISE		= 116;
+	static const uint32 EXCVEC_SFU3_PRECISE		= 118;
+	static const uint32 EXCVEC_SFU4_PRECISE		= 120;
+	static const uint32 EXCVEC_SFU5_PRECISE		= 122;
+	static const uint32 EXCVEC_SFU6_PRECISE		= 124;
+	static const uint32 EXCVEC_SFU7_PRECISE		= 126;
+
+	// 例外の優先順位 (LSB 側が優先度高)。一部カテゴリ分けも兼ねる。
+	//
+	// 優先度	例外
+	//	1		RESET
+	//	1		(ERROR)
+	//	2		INST
+	//	3		UNIMPL_OP
+	//	4		PRIV
+	//	5		INTERNAL … 内部発生例外のうちトラップ以外
+	//	5		TRAP     … 内部発生例外のうちトラップのみ
+	//	--		(OUTER)  …これ以降のどれかが立っているという代表ビット
+	//	6		INTERRUPT
+	//	7		SFU_IMPRECISE
+	//	8		DATA
+	//
+	// ERROR 例外は Table. 6-2 には載ってないけど、実質ダブルバスフォールト
+	// なので、リセットに準じる高さの気がする…。
+	// TRAP は他の内部発生例外 (INTERNAL) とは区別が必要なので分けてある。
+	// INTERNAL と TRAP はこの優先度だけでなくベクタ情報も必要。
+	// INTERRUPT と DATA はどちらが起きても同時に処理するので、
+	// どちらかを立てたまま OUTER ビットで処理させる。
+	// SFU_IMPRECISE は未調査。
+	static const uint32 EXCPRI_RESET			= (1U << 0);
+	static const uint32 EXCPRI_ERROR			= (1U << 1);
+	static const uint32 EXCPRI_INST				= (1U << 2);
+	static const uint32 EXCPRI_UNIMPL_OP		= (1U << 3);
+	static const uint32 EXCPRI_PRIV				= (1U << 4);
+	static const uint32 EXCPRI_INTERNAL			= (1U << 5);
+	static const uint32 EXCPRI_TRAP				= (1U << 6);
+	static const uint32 EXCPRI_OUTER			= (1U << 7);
+	static const uint32 EXCPRI_INTERRUPT		= (1U << 8);
+	static const uint32 EXCPRI_SFU_IMPRECISE	= (1U << 9);
+	static const uint32 EXCPRI_DATA				= (1U << 10);
+	static const uint32 EXCPRI_OUTER_MASK		=
+		EXCPRI_INTERRUPT | EXCPRI_SFU_IMPRECISE | EXCPRI_DATA;
 
 	// 32bit 命令コードからディスパッチ用の 12bit に変換。
 	// ops と disasm で使うため。
@@ -243,11 +276,11 @@ struct m88100reg
 	union {
 		uint32 cr[21] {};
 		struct {
-			uint32 pid;		// cr0
+			uint32 pid;		// cr0 (ReadOnly)
 			uint32 psr;		// cr1
 			uint32 epsr;	// cr2
 			uint32 ssbr;	// cr3
-			uint32 sxip;	// cr4
+			uint32 sxip;	// cr4 (ReadOnly)
 			uint32 snip;	// cr5
 			uint32 sfip;	// cr6
 			uint32 vbr;		// cr7