{"id":1364,"date":"2012-02-28T15:02:27","date_gmt":"2012-02-27T21:02:27","guid":{"rendered":"http:\/\/peta.okechan.net\/blog\/?p=1364"},"modified":"2012-03-14T11:21:52","modified_gmt":"2012-03-14T02:21:52","slug":"xv6%e3%82%bd%e3%83%bc%e3%82%b9%e3%82%b3%e3%83%bc%e3%83%89%e3%83%aa%e3%83%bc%e3%83%87%e3%82%a3%e3%83%b3%e3%82%b0-%e3%81%9d%e3%81%ae23","status":"publish","type":"post","link":"https:\/\/peta.okechan.net\/blog\/archives\/1364","title":{"rendered":"[xv6 #23] Chapter 2 &#8211; Traps, interrupts, and drivers &#8211; X86 protection"},"content":{"rendered":"<p>\u30c6\u30ad\u30b9\u30c8\u306e32\u301c33\u30da\u30fc\u30b8<\/p>\n<h3>\u672c\u6587<\/h3>\n<p>x86\u306f\uff14\u3064\u306e\u4fdd\u8b77\u30ec\u30d9\u30eb\u3092\u6301\u3064\u3002<br \/>\n0\u756a\uff08\u4e00\u756a\u6a29\u9650\u304c\u9ad8\u3044\uff09\u304b\u30893\u756a\uff08\u4e00\u756a\u6a29\u9650\u304c\u4f4e\u3044\uff09\u3067\u3042\u308b\u3002<br \/>\n\u7fd2\u6163\u3067\u306f\u3001\u591a\u304f\u306eOS\u306f\uff12\u3064\u306e\u30ec\u30d9\u30eb\u3060\u3051\u4f7f\u3046\u3002<br \/>\n\u305d\u308c\u306f0\u30683\u3067\u3042\u308b\u304c\u3001\u305d\u308c\u305e\u308c\u30ab\u30fc\u30cd\u30eb\u30e2\u30fc\u30c9\u3068\u30e6\u30fc\u30b6\u30fc\u30e2\u30fc\u30c9\u3068\u547c\u3070\u308c\u308b\u3002<br \/>\nx86\u306e\u547d\u4ee4\u306e\u5b9f\u884c\u306b\u95a2\u3059\u308b\u73fe\u5728\u306e\u7279\u6a29\u30ec\u30d9\u30eb\u306f\u3001%cs\u30ec\u30b8\u30b9\u30bf\u306eCPL\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u4fdd\u6301\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<p>x86\u3067\u306f\u3001\u5272\u308a\u8fbc\u307f\u30cf\u30f3\u30c9\u30e9\u306f\u5272\u308a\u8fbc\u307f\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30c6\u30fc\u30d6\u30eb\uff08IDT\uff09\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u3002<br \/>\nIDT\u306f256\u500b\u306e\u30a8\u30f3\u30c8\u30ea\u3092\u6301\u3061\u3001\u305d\u306e\u30a8\u30f3\u30c8\u30ea\u304c\u6301\u3064%cs\u3068%eip\u3092\u5bfe\u5fdc\u3059\u308b\u5272\u308a\u8fbc\u307f\u3092\u5236\u5fa1\u3059\u308b\u3068\u304d\u306b\u4f7f\u3046\u3002<\/p>\n<p>x86\u4e0a\u3067\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3092\u5b9f\u884c\u3059\u308b\u3068\u304d\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306fint n\u547d\u4ee4\u3092\u547c\u3073\u51fa\u3059\u3002<br \/>\nn\u306fIDT\u3078\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6307\u5b9a\u3059\u308b\u3002<br \/>\nint\u547d\u4ee4\u306f\u3001\u6b21\u306e\u624b\u9806\u3092\u884c\u3046\u3002<\/p>\n<p>\u30fbint\u306e\u5f15\u6570\u3067\u3042\u308bn\u3092\u4f7f\u3044\u3001IDT\u304b\u3089n\u756a\u76ee\u306e\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u3092\u691c\u7d22\u3059\u308b\u3002<br \/>\n\u30fb\u305d\u306e%cs\u306eCPL\u304cDPL\u4ee5\u4e0b\u3067\u3042\u308b\u4e8b\u3092\u8abf\u3079\u308b\u3002DPL\u306f\u305d\u306e\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u306b\u304a\u3051\u308b\u7279\u6a29\u30ec\u30d9\u30eb\u3067\u3042\u308b\u3002<br \/>\n\u30fbCPU\u5185\u90e8\u306e\u30ec\u30b8\u30b9\u30bf%esp\u3068%ss\u3092\u4fdd\u5b58\u3059\u308b\u3002\u305f\u3060\u3057\u3001\u5bfe\u8c61\u306e\u30bb\u30b0\u30e1\u30f3\u30c8\u306e\u30bb\u30ec\u30af\u30bf\u306ePL\u304cCPL\u3088\u308a\u5c0f\u3055\u3044\u3068\u304d\u3060\u3051\u3067\u3042\u308b\u3002<br \/>\n\u30fb\u30bf\u30b9\u30af\u30bb\u30b0\u30e1\u30f3\u30c8\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u304b\u3089%ss\u3068%esp\u3092\u8aad\u307f\u8fbc\u3080\u3002<br \/>\n\u30fb%ss\u3092\u30d7\u30c3\u30b7\u30e5\u3059\u308b\u3002<br \/>\n\u30fb%esp\u3092\u30d7\u30c3\u30b7\u30e5\u3059\u308b\u3002<br \/>\n\u30fb%eflags\u3092\u30d7\u30c3\u30b7\u30e5\u3059\u308b\u3002<br \/>\n\u30fb%cs\u3092\u30d7\u30c3\u30b7\u30e5\u3059\u308b\u3002<br \/>\n\u30fb%eip\u3092\u30d7\u30c3\u30b7\u30e5\u3059\u308b\u3002<br \/>\n\u30fb%eflags\u306e\u4e00\u90e8\u3092\u30af\u30ea\u30a2\u3059\u308b\u3002<br \/>\n\u30fb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u306e\u4e2d\u306e\u5024\u3092%cs\u3068%eip\u306b\u30bb\u30c3\u30c8\u3059\u308b\u3002<\/p>\n<p>\u3053\u306eint\u547d\u4ee4\u306f\u8907\u5408\u7684\u306a\u547d\u4ee4\u3067\u3042\u308a\u3001\u305d\u308c\u3089\u5168\u3066\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u304c\u5fc5\u8981\u306a\u306e\u304b\u3069\u3046\u304b\u4e0d\u601d\u8b70\u304b\u3082\u3057\u308c\u306a\u3044\u3002<br \/>\nCPL\u304cDPL\u4ee5\u4e0b\u3067\u3042\u308b\u4e8b\u3092\u8abf\u3079\u308b\u4e8b\u306f\u3001\u30ab\u30fc\u30cd\u30eb\u304c\u4ed6\u306e\u7279\u6a29\u30ec\u30d9\u30eb\u306e\u305f\u3081\u306e\u30b7\u30b9\u30c6\u30e0\u3092\u7981\u6b62\u3059\u308b\u3053\u3068\u3092\u53ef\u80fd\u306b\u3059\u308b\u3002<br \/>\n\u4f8b\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30d7\u30ed\u30b0\u30e9\u30e0\u304cint\u547d\u4ee4\u3092\u4e0a\u624b\u304f\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u306f\u3001DPL\u306f3\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<br \/>\n\u3082\u3057\u30e6\u30fc\u30b6\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u9069\u5207\u306a\u7279\u6a29\u3092\u6301\u305f\u306a\u3051\u308c\u3070\u3001int\u547d\u4ee4\u306fint 13\u3092\u8fd4\u3059\u3002<br \/>\nint 13\u3068\u306f\u4e00\u822c\u4fdd\u8b77\u9055\u53cd\u3067\u3042\u308b\u3002<br \/>\n\u4ed6\u306e\u4f8b\u3067\u306f\u3001int\u547d\u4ee4\u306f\u5024\u3092\u4fdd\u5b58\u3059\u308b\u305f\u3081\u306b\u30e6\u30fc\u30b6\u30b9\u30bf\u30c3\u30af\u3092\u4f7f\u3046\u3053\u3068\u306f\u51fa\u6765\u306a\u3044\u3002<br \/>\n\u306a\u305c\u306a\u3089\u3001\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u304c\u30bf\u30b9\u30af\u30bb\u30b0\u30e1\u30f3\u30c8\u4e0a\u3067\u30b9\u30bf\u30c3\u30af\u3092\u4f7f\u3046\u305f\u3081\u306e\u9069\u5207\u306a\u30b9\u30bf\u30c3\u30af\u3092\u30e6\u30fc\u30b6\u306f\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3057\u3066\u3044\u306a\u3044\u3067\u3042\u308d\u3046\u304b\u3089\u3067\u3042\u308b\u3002<br \/>\n\u305d\u308c\u306f\u30ab\u30fc\u30cd\u30eb\u30e2\u30fc\u30c9\u3067\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3055\u308c\u308b\u3002<\/p>\n<p>\u56f32-1\u306f\u3001int\u547d\u4ee4\u304c\u5b8c\u4e86\u3057\u3001\u7279\u6a29\u30ec\u30d9\u30eb\u306e\u5909\u66f4\u304c\u3042\u3063\u305f\u5f8c\u306e\u30b9\u30bf\u30c3\u30af\u3092\u8868\u3057\u3066\u3044\u308b\u3002<br \/>\n\uff08\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u306e\u7279\u6a29\u30ec\u30d9\u30eb\u306fCPL\u3088\u308a\u5c0f\u3055\u3044\uff09<br \/>\n\u3082\u3057\u3001int\u547d\u4ee4\u304c\u7279\u6a29\u30ec\u30d9\u30eb\u306e\u5909\u66f4\u3092\u5fc5\u8981\u3068\u3057\u306a\u304b\u3063\u305f\u3089\u3001x86\u306f%ss\u3068%esp\u3092\u4fdd\u5b58\u3057\u306a\u3044\u3060\u308d\u3046\u3002<br \/>\n\u4e21\u65b9\u306e\u5834\u5408\u3067\u3001%eip\u306f\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u30c6\u30fc\u30d6\u30eb\u4e0a\u3067\u4e0e\u3048\u3089\u308c\u305f\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u3057\u3066\u3044\u308b\u3002<br \/>\n\u305d\u306e\u30a2\u30c9\u30ec\u30b9\u306e\u547d\u4ee4\u306f\u3001\u6b21\u306b\u5b9f\u884c\u3055\u308c\u308b\u547d\u4ee4\u3068int n\u306e\u70ba\u306e\u30cf\u30f3\u30c9\u30e9\u306e\u6700\u521d\u306e\u547d\u4ee4\u3067\u3042\u308b\u3002<br \/>\n\u3053\u308c\u304c\u3001\u305d\u308c\u3089\u306e\u30cf\u30f3\u30c9\u30e9\u3092OS\u304c\u5b9f\u884c\u3059\u308b\u305f\u3081\u306e\u4ed5\u4e8b\u3067\u3042\u308a\u3001\u6b21\u304b\u3089xv6\u304c\u305d\u308c\u3092\u3069\u3046\u5b9f\u73fe\u3059\u308b\u304b\u3092\u898b\u3066\u3044\u304f\u3002<\/p>\n<p>\u56f32-1 int\u547d\u4ee4\u8a9e\u306e\u30ab\u30fc\u30cd\u30eb\u30b9\u30bf\u30c3\u30af<br \/>\n<a href=\"https:\/\/peta.okechan.net\/blog\/wp-content\/uploads\/2012\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2012-02-28-5.59.29.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/peta.okechan.net\/blog\/wp-content\/uploads\/2012\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2012-02-28-5.59.29-300x168.png\" alt=\"\" title=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2012-02-28 5.59.29\" width=\"300\" height=\"168\" class=\"aligncenter size-medium wp-image-1365\" srcset=\"https:\/\/peta.okechan.net\/blog\/wp-content\/uploads\/2012\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2012-02-28-5.59.29-300x168.png 300w, https:\/\/peta.okechan.net\/blog\/wp-content\/uploads\/2012\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2012-02-28-5.59.29.png 578w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>OS\u306firet\u547d\u4ee4\u3092\u3001int\u547d\u4ee4\u304b\u3089\u623b\u308b\u305f\u3081\u306b\u4f7f\u3046\u4e8b\u304c\u3067\u304d\u308b\u3002<br \/>\n\u305d\u306e\u547d\u4ee4\u306f\u3001\u30b9\u30bf\u30c3\u30af\u304b\u3089int\u547d\u4ee4\u306e\u9593\u306b\u4fdd\u5b58\u3055\u308c\u305f\u5024\u3092\u53d6\u308a\u51fa\u3057\u3001\u4fdd\u5b58\u3055\u308c\u305f%eip\u304b\u3089\u5b9f\u884c\u3092\u518d\u958b\u3059\u308b\u3002<\/p>\n<h3>\u611f\u60f3<\/h3>\n<p>\u6b63\u76f4IDT\u5468\u308a\u304c\u3088\u304f\u5206\u304b\u308a\u307e\u305b\u3093\u3002<br \/>\n\u305f\u3060\u3001\u6b21\u306e\u7bc0\u304b\u3089\u30b3\u30fc\u30c9\u306e\u8aac\u660e\u304c\u9023\u7d9a\u3059\u308b\u306e\u3067\u3001\u305d\u3053\u3067\u8a73\u7d30\u304c\u5206\u304b\u308b\u3093\u3067\u306f\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30c6\u30ad\u30b9\u30c8\u306e32\u301c33\u30da\u30fc\u30b8<\/p>\n<h3>\u672c\u6587<\/h3>\n<p>x86\u306f\uff14\u3064\u306e\u4fdd\u8b77\u30ec\u30d9\u30eb\u3092\u6301\u3064\u3002<br \/>\n0\u756a\uff08\u4e00\u756a\u6a29\u9650\u304c\u9ad8\u3044\uff09\u304b\u30893\u756a\uff08\u4e00\u756a\u6a29\u9650\u304c\u4f4e\u3044\uff09\u3067\u3042\u308b\u3002<br \/>\n\u7fd2\u6163\u3067\u306f\u3001\u591a\u304f\u306eOS\u306f\uff12\u3064\u306e\u30ec\u30d9\u30eb\u3060\u3051\u4f7f\u3046\u3002<br 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