{"id":1339,"date":"2012-02-25T09:57:12","date_gmt":"2012-02-24T15:57:12","guid":{"rendered":"http:\/\/peta.okechan.net\/blog\/?p=1339"},"modified":"2012-03-14T11:21:57","modified_gmt":"2012-03-14T02:21:57","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%ae20","status":"publish","type":"post","link":"https:\/\/peta.okechan.net\/blog\/archives\/1339","title":{"rendered":"[xv6 #20] Chapter 1 – The first process – Exercises"},"content":{"rendered":"

\u30c6\u30ad\u30b9\u30c8\u306e30\u30da\u30fc\u30b8<\/p>\n

\u672c\u6587<\/h3>\n

1. <\/h3>\n

swtch\u306b\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u3092\u30bb\u30c3\u30c8\u3057\u306a\u3055\u3044\u3002
\ngdb\u306estepi\u3067swtch\u306eforkret\u3078\u306eret\u307e\u3067\u4e00\u6bb5\u968e\u305a\u3064\u5b9f\u884c\u3057\u3001\u305d\u3057\u3066trapret\u3092\u7d9a\u884c\u3059\u308b\u305f\u3081\u306bgdb\u306efinish\u3092\u4f7f\u3044\u3001\u305d\u3057\u3066\u4eee\u60f3\u30a2\u30c9\u30ec\u30b9\u30bc\u30ed\u306einitcode\u306b\u5230\u9054\u3059\u308b\u307e\u3067stepi\u3092\u3057\u306a\u3055\u3044\u3002<\/p>\n

2. <\/h3>\n

\u5b9f\u969b\u306eOS\u304c\u3069\u3046\u3084\u3063\u3066\u30e1\u30e2\u30ea\u3092\u5206\u3051\u3066\u308b\u304b\u3092\u898b\u306a\u3055\u3044\u3002<\/p>\n

3. <\/h3>\n

xv6\u304c\u30b9\u30fc\u30d1\u30fc\u30da\u30fc\u30b8\u3092\u4f7f\u3063\u3066\u306a\u304b\u3063\u305f\u3089\u3001entrypgdir\u306e\u6b63\u3057\u3044\u5b9a\u7fa9\u306f\u3069\u3093\u306a\u3060\u308d\u3046\u304b\uff1f<\/p>\n

4. <\/h3>\n

exec\u306eUnix\u306b\u304a\u3051\u308b\u5b9f\u88c5\u306f\u3001\u4f1d\u7d71\u7684\u306b\u30b7\u30a7\u30eb\u30b9\u30af\u30ea\u30d7\u30c8\u306e\u305f\u3081\u306e\u7279\u5225\u306a\u64cd\u4f5c\u3092\u542b\u3080\u3002
\n\u3082\u3057\u3001\u5b9f\u884c\u3057\u305f\u3044\u30d5\u30a1\u30a4\u30eb\u304c#!\u3067\u59cb\u307e\u3063\u3066\u305f\u3089\u3001\u305d\u306e\u6700\u521d\u306e\u884c\u306f\u3001\u305d\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u89e3\u91c8\u3059\u308b\u305f\u3081\u306b\u5b9f\u884c\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u3002
\n\u4f8b\u3048\u3070\u3001\u3082\u3057exec\u304cmyprog arg1\uff08myprog\u306e\u6700\u521d\u306e\u884c\u306f#!\/interp\u3068\u3059\u308b\uff09\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u547c\u3070\u308c\u305f\u3089\u3001exec\u306f\/interp\u3092\/interp myprog arg1\u3068\u3057\u3066\u5b9f\u884c\u3059\u308b\u3002
\nxv6\u3067\u3053\u306e\u3057\u304d\u305f\u308a\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u305f\u3081\u306e\u6a5f\u80fd\u3092\u5b9f\u88c5\u3057\u306a\u3055\u3044\u3002<\/p>\n

5. <\/h3>\n

KENBASE\u306f\u4e00\u3064\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u5229\u7528\u53ef\u80fd\u306a\u30e1\u30e2\u30ea\u306e\u91cf\u3092\u5236\u9650\u3057\u3066\u3044\u308b\u3002
\n\u305d\u308c\u306f4GB\u30d5\u30eb\u306b\u7a4d\u3093\u3060\u30de\u30b7\u30f3\u3067\u306f\u3082\u3063\u305f\u3044\u306a\u3044\u3002
\nKERNBASE\u3092\u3088\u308a\u4e0a\u4f4d\u306b\u6301\u3063\u3066\u3044\u304f\u4e8b\u306f\u3001\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u308a\u591a\u304f\u306e\u30e1\u30e2\u30ea\u3092\u63d0\u4f9b\u3067\u304d\u308b\u3060\u308d\u3046\u304b\uff1f<\/p>\n

\u4f5c\u696d<\/h3>\n

1. \u306b\u3064\u3044\u3066<\/h3>\n

\u305d\u306e0\u3067xv6\u3092make\u3059\u308b\u305f\u3081\u306b\u4f7f\u3063\u305fFedora\u3092\u4f7f\u3044\u307e\u3057\u305f\u3002
\n# make qemu-gdb
\n\u3067gdb\u306b\u3088\u308b\u8ffd\u8de1\u304c\u53ef\u80fd\u306a\u72b6\u614b\u3067\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002
\n\u8b66\u544a\u3092\u30a8\u30e9\u30fc\u3068\u898b\u306a\u3059\u8a2d\u5b9a\u306b\u306a\u3063\u3066\u3066\u3046\u3061\u3067\u306f\u305d\u306e\u307e\u307e\u30b3\u30f3\u30d1\u30a4\u30eb\u51fa\u6765\u306a\u304b\u3063\u305f\u306e\u3067\u3001\u3068\u308a\u3042\u3048\u305aMakefile\u306e\u4e2d\u306b\u66f8\u304b\u308c\u3066\u3044\u308b-Werror\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u90e8\u5206\u3092\u5168\u90e8\u524a\u9664\u3057\u305f\u3089\u30b3\u30f3\u30d1\u30a4\u30eb\u51fa\u6765\u307e\u3057\u305f\u3002
\n\u3067qemu\u306e\u30a6\u30a4\u30f3\u30c9\u30a6\u304c\u51fa\u307e\u3059\u304cgdb\u304b\u3089\u306e\u63a5\u7d9a\u5f85\u3061\u3067\u56fa\u307e\u3063\u3066\u308b\u306e\u3067\u3001\u5225\u306e\u30bf\u30fc\u30df\u30ca\u30eb\u3067
\n# gdb
\n\u3068\u5b9f\u884c\u3059\u308b\u3068xv6\u306b\u63a5\u7d9a\u51fa\u6765\u307e\u3059\u3002<\/p>\n

\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u3092\u8a2d\u5b9a\u3057\u305f\u6bb5\u968e\u306e\u753b\u50cf\u3002
\n\"\"<\/a><\/p>\n

swtch\u306e\u30b9\u30c6\u30c3\u30d7\u5b9f\u884c\u306f\u51fa\u6765\u307e\u3057\u305f\u304c\u3001initcode\u306b\u5230\u9054\u3059\u308b\u307e\u3067\u304c\u305a\u3044\u3076\u3093\u9577\u305d\u3046\u3060\u3063\u305f\u306e\u3067\u3001\u9014\u4e2d\u3067\u3042\u304d\u3089\u3081\u3066
\n(gdb) break *0
\n\u3067\u30a2\u30c9\u30ec\u30b90\u306b\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u3092\u7f6e\u3044\u3066continue\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u305f(\uff1b\u30fb\u2200\u30fb)
\n\u78ba\u304b\u306b\u30a2\u30c9\u30ec\u30b90\u304b\u3089\u306e\u547d\u4ee4\u3092\u5b9f\u884c\u3057\u3066\u307e\u3057\u305f\u3002<\/p>\n

2. \u306b\u3064\u3044\u3066<\/h3>\n

\u7c21\u5358\u306a\u5404\u7a2eOS\u306e\u4eee\u60f3\u30e1\u30e2\u30ea\u306e\u5bfe\u5fdc\u72b6\u6cc1\u3068\u3057\u3066\u306f\u3001\u4eee\u60f3\u8a18\u61b6 – Wikipedia<\/a>\u306b\u3061\u3087\u3063\u3068\u66f8\u3044\u3066\u3042\u308a\u307e\u3059\u306d\u3002
\n\u3053\u306e\u30c6\u30ad\u30b9\u30c8\u3067\u4eca\u307e\u3067\u8aad\u3093\u3067\u304d\u305f\u3088\u3046\u306a\u5185\u5bb9\u306e\u30ec\u30d9\u30eb\u3067\u306e\u9055\u3044\u3092\u77e5\u308b\u305f\u3081\u306b\u306f\u30bd\u30fc\u30b9\u8aad\u3093\u3060\u308a\u3057\u306a\u3044\u3068\u2026\u3002<\/p>\n

3. \u306b\u3064\u3044\u3066<\/h3>\n

\u30b9\u30fc\u30d1\u30fc\u30da\u30fc\u30b8\u306b\u3064\u3044\u3066\u306f1\u7ae0\u306eCode: entry page table\u306e\u7bc0\u306b\u51fa\u3066\u304d\u307e\u3057\u305f\u3002
\n\u3053\u3053\u3067\u3044\u3046\u30b9\u30fc\u30d1\u30fc\u30da\u30fc\u30b8\u3068\u306f\u30014KB\u3054\u3068\u3067\u306f\u306a\u304f4MB\u3054\u3068\u3092\u4eee\u60f3\u30a2\u30c9\u30ec\u30b9\u306b\u5272\u308a\u5f53\u3066\u308b\u8d77\u52d5\u51e6\u7406\u306e\u521d\u671f\u306b\u4f7f\u308f\u308c\u308b\u30da\u30fc\u30b8\u306e\u4e8b\u3067\u3059\u3002
\nentrypgdir\u306fmain.c\u3067<\/p>\n

pde_t entrypgdir[NPDENTRIES] = {\n  \/\/ Map VA's [0, 4MB) to PA's [0, 4MB)\n  [0] = (0) + PTE_P + PTE_W + PTE_PS,\n  \/\/ Map VA's [KERNBASE, KERNBASE+4MB) to PA's [0, 4MB)\n  [KERNBASE>>PDXSHIFT] = (0) + PTE_P + PTE_W + PTE_PS,\n};<\/pre>\n
\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002
\n\u3067\u3001\u3053\u308c\u30924KB\u30da\u30fc\u30b8\u5bfe\u5fdc\u306b\u3059\u308b\u306b\u306f\u3001\u901a\u5e38\u3068\u540c\u3058\u3088\u3046\u306b\u30da\u30fc\u30b8\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3068\u30da\u30fc\u30b8\u30c6\u30fc\u30d6\u30eb\u306e2\u6bb5\u968e\u69cb\u6210\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3067\u3057\u3087\u3046\u306d\u3002
\n\u304c\u3057\u304b\u3057\u5177\u4f53\u7684\u306b\u3069\u3046\u66f8\u304d\u306a\u304a\u305b\u3070\u3044\u3044\u304b\u306f\u5206\u304b\u308a\u307e\u305b\u3093(\uff1b\u30fb\u2200\u30fb)<\/p>\n
4. \u306b\u3064\u3044\u3066<\/h3>\n
\u5b9f\u88c5\uff1f\u03a3(\uff9f\u0414\uff9f\uff1b\uff74\uff70\uff6f!
\n\u4e00\u5fdc\u8aad\u3080\u3053\u3068\u306b\u91cd\u70b9\u3092\u7f6e\u3044\u3066\u308b\u306e\u3067\u5b9f\u88c5\u306f\u3057\u307e\u305b\u3093\u304c\u3001\u3061\u3087\u3063\u3068\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002
\nxv6\u306e\u30b7\u30a7\u30eb\u306fsh.c\u3067\u5b9f\u88c5\u3055\u308c\u3066\u308b\u306e\u3067\u5f53\u7136\u305d\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u5909\u66f4\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002
\nruncmd\u95a2\u6570\u306ecase EXEC:\u306e\u90e8\u5206\u306e\u51e6\u7406\u306b\u8ffd\u52a0\u3059\u308c\u3070\u826f\u3055\u305d\u3046\u3067\u3059\u3002
\n\u30d5\u30a1\u30a4\u30eb\u306e1\u884c\u76ee\u3092\u8aad\u307f\u8fbc\u307f\u59a5\u5f53\u306a\u30b7\u30d0\u30f3\u306a\u3089\u305d\u3053\u304b\u3089\u30d7\u30ed\u30b0\u30e9\u30e0\u30d1\u30b9\u3092\u629c\u304d\u51fa\u3057\u3001\u305d\u308c\u3092exec\u306e\u7b2c\u4e00\u5f15\u6570\u3068\u3057\u3001\u5143\u306e\u30b3\u30de\u30f3\u30c9\u3068\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u7b2c\u4e8c\u5f15\u6570\u3068\u3057\u3066\u6e21\u305b\u3070\u826f\u3055\u305d\u3046\u3067\u3059\u3002<\/p>\n
5. \u306b\u3064\u3044\u3066<\/h3>\n
\u7b54\u3048\u306fYES\u3067\u3082\u3042\u308aNO\u3067\u3082\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002
\nKERNBASE\u306f\u4eee\u60f3\u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u4e0a\u306e\u4f4d\u7f6e\u306b\u904e\u304e\u305a\u3001\u7269\u7406\u30e1\u30e2\u30ea\u4e0a\u3067\u306f\u30ab\u30fc\u30cd\u30eb\u306f\u6700\u521d\u306e\u65b9\u306b\u4f4d\u7f6e\u3057\u3066\u3066\u3001\u305d\u306e\u4ed6\u8af8\u3005\u3092\u7701\u3044\u305f\u6b8b\u308a\u3092\u30e6\u30fc\u30b6\u30d7\u30ed\u30bb\u30b9\u304c\u5206\u3051\u5408\u3046\u3068\u3044\u3046\u5f62\u306b\u306a\u3063\u3066\u307e\u3059\u3002
\n\u306a\u306e\u3067\u8907\u6570\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u4f7f\u3048\u308b\u7269\u7406\u30e1\u30e2\u30ea\u306e\u5408\u8a08\u306f\u5909\u308f\u308a\u307e\u305b\u3093\u304c\u3001\u4e00\u3064\u306e\u30d7\u30ed\u30bb\u30b9\u306b\u9650\u308c\u30702GB\u307e\u3067\u4f7f\u7528\u53ef\u80fd\u306a\u306e\u304c\u3001\u3044\u304f\u3089\u304b\u5897\u3084\u305b\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n
\u611f\u60f3<\/h3>\n
Exercises\u306f\u307b\u3068\u3093\u3069\u7b54\u3048\u3089\u308c\u306a\u3044\u3093\u3058\u3083\u306a\u3044\u304b\u3068\u601d\u3063\u3066\u307e\u3057\u305f\u3002
\n\u59a5\u5f53\u306a\u5185\u5bb9\u304b\u3069\u3046\u304b\u306f\u5225\u3068\u3057\u3066\u3053\u308c\u3060\u3051\u53cd\u5fdc\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u4e8b\u304c\u3068\u3066\u3082\u5b09\u3057\u3044\u3067\u3059\u3002
\n\u3053\u306e\u30c6\u30ad\u30b9\u30c8\u3092\u8aad\u307f\u59cb\u3081\u308b\u524d\u306e\u81ea\u5206\u3060\u3068\u624b\u3082\u8db3\u3082\u51fa\u306a\u304b\u3063\u305f\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n
\u3042\u3068OS\u754c\u9688\u306e\u65b9\u306b\u306f\u5e38\u8b58\u306a\u306e\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001xv6\u306e\u8d77\u52d5\u30d7\u30ed\u30bb\u30b9\u3092gdb\u3067\u30c7\u30d0\u30c3\u30b0\u51fa\u6765\u308b\u4e8b\u306b\u611f\u52d5\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u305f\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u30c6\u30ad\u30b9\u30c8\u306e30\u30da\u30fc\u30b8<\/p>\n
\u672c\u6587<\/h3>\n
1. <\/h3>\n
swtch\u306b\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u3092\u30bb\u30c3\u30c8\u3057\u306a\u3055\u3044\u3002
\ngdb\u306estepi\u3067swtch\u306eforkret\u3078\u306eret\u307e\u3067\u4e00\u6bb5\u968e\u305a\u3064\u5b9f\u884c\u3057\u3001\u305d\u3057\u3066trapret\u3092\u7d9a\u884c\u3059\u308b\u305f\u3081\u306bgdb\u306efinish\u3092\u4f7f\u3044\u3001\u305d\u3057\u3066\u4eee\u60f3\u30a2\u30c9\u30ec\u30b9\u30bc\u30ed\u306einitcode\u306b\u5230\u9054\u3059\u308b\u307e\u3067stepi\u3092\u3057\u306a\u3055\u3044\u3002<\/p>\n
2. <\/h3>\n
\u5b9f\u969b\u306eOS\u304c\u3069\u3046\u3084\u3063\u3066\u30e1\u30e2\u30ea\u3092\u5206\u3051\u3066\u308b\u304b\u3092\u898b\u306a\u3055\u3044\u3002<\/p>\n
3. <\/h3>\n
xv6\u304c\u30b9\u30fc\u30d1\u30fc\u30da\u30fc\u30b8\u3092\u4f7f\u3063\u3066\u306a\u304b\u3063\u305f\u3089\u3001entrypgdir\u306e\u6b63\u3057\u3044\u5b9a\u7fa9\u306f\u3069\u3093\u306a\u3060\u308d\u3046\u304b\uff1f<\/p>\n
4. <\/h3>\n
exec\u306eUnix\u306b\u304a\u3051\u308b\u5b9f\u88c5\u306f\u3001\u4f1d\u7d71\u7684\u306b\u30b7\u30a7\u30eb\u30b9\u30af\u30ea\u30d7\u30c8\u306e\u305f\u3081\u306e\u7279\u5225\u306a\u64cd\u4f5c\u3092\u542b\u3080\u3002
\n\u3082\u3057\u3001\u5b9f\u884c\u3057\u305f\u3044\u30d5\u30a1\u30a4\u30eb\u304c#!\u3067\u59cb\u307e\u3063\u3066\u305f\u3089\u3001\u305d\u306e\u6700\u521d\u306e\u884c\u306f\u3001\u305d\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u89e3\u91c8\u3059\u308b\u305f\u3081\u306b\u5b9f\u884c\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u3002
\n\u4f8b\u3048\u3070\u3001\u3082\u3057exec\u304cmyprog arg1\uff08myprog\u306e\u6700\u521d\u306e\u884c\u306f#!\/interp\u3068\u3059\u308b\uff09\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u547c\u3070\u308c\u305f\u3089\u3001exec\u306f\/interp\u3092\/interp myprog arg1\u3068\u3057\u3066\u5b9f\u884c\u3059\u308b\u3002
\nxv6\u3067\u3053\u306e\u3057\u304d\u305f\u308a\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u305f\u3081\u306e\u6a5f\u80fd\u3092\u5b9f\u88c5\u3057\u306a\u3055\u3044\u3002<\/p>\n
5. <\/h3>\n
KENBASE\u306f\u4e00\u3064\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u5229\u7528\u53ef\u80fd\u306a\u30e1\u30e2\u30ea\u306e\u91cf\u3092\u5236\u9650\u3057\u3066\u3044\u308b\u3002
\n\u305d\u308c\u306f4GB\u30d5\u30eb\u306b\u7a4d\u3093\u3060\u30de\u30b7\u30f3\u3067\u306f\u3082\u3063\u305f\u3044\u306a\u3044\u3002
\nKERNBASE\u3092\u3088\u308a\u4e0a\u4f4d\u306b\u6301\u3063\u3066\u3044\u304f\u4e8b\u306f\u3001\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u308a\u591a\u304f\u306e\u30e1\u30e2\u30ea\u3092\u63d0\u4f9b\u3067\u304d\u308b\u3060\u308d\u3046\u304b\uff1f<\/p>\n
\u4f5c\u696d<\/h3>\n
1. \u306b\u3064\u3044\u3066<\/h3>\n
\u305d\u306e0\u3067xv6\u3092make\u3059\u308b\u305f\u3081\u306b\u4f7f\u3063\u305fFedora\u3092\u4f7f\u3044\u307e\u3057\u305f\u3002
\n# make qemu-gdb
\n\u3067gdb\u306b\u3088\u308b\u8ffd\u8de1\u304c\u53ef\u80fd\u306a\u72b6\u614b\u3067\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002
\n\u8b66\u544a\u3092\u30a8\u30e9\u30fc\u3068\u898b\u306a\u3059\u8a2d\u5b9a\u306b\u306a\u3063\u3066\u3066\u3046\u3061\u3067\u306f\u305d\u306e\u307e\u307e\u30b3\u30f3\u30d1\u30a4\u30eb\u51fa\u6765\u306a\u304b\u3063\u305f\u306e\u3067\u3001\u3068\u308a\u3042\u3048\u305aMakefile\u306e\u4e2d\u306b\u66f8\u304b\u308c\u3066\u3044\u308b-Werror\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u90e8\u5206\u3092\u5168\u90e8\u524a\u9664\u3057\u305f\u3089\u30b3\u30f3\u30d1\u30a4\u30eb\u51fa\u6765\u307e\u3057\u305f\u3002
\n\u3067qemu\u306e\u30a6\u30a4\u30f3\u30c9\u30a6\u304c\u51fa\u307e\u3059\u304cgdb\u304b\u3089\u306e\u63a5\u7d9a\u5f85\u3061\u3067\u56fa\u307e\u3063\u3066\u308b\u306e\u3067\u3001\u5225\u306e\u30bf\u30fc\u30df\u30ca\u30eb\u3067
\n# gdb
\n\u3068\u5b9f\u884c\u3059\u308b\u3068xv6\u306b\u63a5\u7d9a\u51fa\u6765\u307e\u3059\u3002<\/p>\n
\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u3092\u8a2d\u5b9a\u3057\u305f\u6bb5\u968e\u306e\u753b\u50cf\u3002
\n\"\"<\/a><\/p>\n
swtch\u306e\u30b9\u30c6\u30c3\u30d7\u5b9f\u884c\u306f\u51fa\u6765\u307e\u3057\u305f\u304c\u3001initcode\u306b\u5230\u9054\u3059\u308b\u307e\u3067\u304c\u305a\u3044\u3076\u3093\u9577\u305d\u3046\u3060\u3063\u305f\u306e\u3067\u3001\u9014\u4e2d\u3067\u3042\u304d\u3089\u3081\u3066
\n(gdb) break *0
\n\u3067\u30a2\u30c9\u30ec\u30b90\u306b\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u3092\u7f6e\u3044\u3066continue\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u305f(\uff1b\u30fb\u2200\u30fb)
\n\u78ba\u304b\u306b\u30a2\u30c9\u30ec\u30b90\u304b\u3089\u306e\u547d\u4ee4\u3092\u5b9f\u884c\u3057\u3066\u307e\u3057\u305f\u3002<\/p>\n
2. \u306b\u3064\u3044\u3066<\/h3>\n
\u7c21\u5358\u306a\u5404\u7a2eOS\u306e\u4eee\u60f3\u30e1\u30e2\u30ea\u306e\u5bfe\u5fdc\u72b6\u6cc1\u3068\u3057\u3066\u306f\u3001\u4eee\u60f3\u8a18\u61b6 – Wikipedia<\/a>\u306b\u3061\u3087\u3063\u3068\u66f8\u3044\u3066\u3042\u308a\u307e\u3059\u306d\u3002
\n\u3053\u306e\u30c6\u30ad\u30b9\u30c8\u3067\u4eca\u307e\u3067\u8aad\u3093\u3067\u304d\u305f\u3088\u3046\u306a\u5185\u5bb9\u306e\u30ec\u30d9\u30eb\u3067\u306e\u9055\u3044\u3092\u77e5\u308b\u305f\u3081\u306b\u306f\u30bd\u30fc\u30b9\u8aad\u3093\u3060\u308a\u3057\u306a\u3044\u3068\u2026\u3002<\/p>\n
3. \u306b\u3064\u3044\u3066<\/h3>\n
\u30b9\u30fc\u30d1\u30fc\u30da\u30fc\u30b8\u306b\u3064\u3044\u3066\u306f1\u7ae0\u306eCode: entry page table\u306e\u7bc0\u306b\u51fa\u3066\u304d\u307e\u3057\u305f\u3002
\n\u3053\u3053\u3067\u3044\u3046\u30b9\u30fc\u30d1\u30fc\u30da\u30fc\u30b8\u3068\u306f\u30014KB\u3054\u3068\u3067\u306f\u306a\u304f4MB\u3054\u3068\u3092\u4eee\u60f3\u30a2\u30c9\u30ec\u30b9\u306b\u5272\u308a\u5f53\u3066\u308b\u8d77\u52d5\u51e6\u7406\u306e\u521d\u671f\u306b\u4f7f\u308f\u308c\u308b\u30da\u30fc\u30b8\u306e\u4e8b\u3067\u3059\u3002
\nentrypgdir\u306fmain.c\u3067<\/p>\n
pde_t entrypgdir[NPDENTRIES] = {\n  \/\/ Map VA's [0, 4MB) to PA's [0, 4MB)\n  [0] = (0) + PTE_P + PTE_W + PTE_PS,\n  \/\/ Map VA's [KERNBASE, KERNBASE+4MB) to PA's [0, 4MB)\n  [KERNBASE>>PDXSHIFT] = (0) + PTE_P + PTE_W + PTE_PS,\n};<\/pre>\n
\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002
\n\u3067\u3001\u3053\u308c\u30924KB\u30da\u30fc\u30b8\u5bfe\u5fdc\u306b\u3059\u308b\u306b\u306f\u3001\u901a\u5e38\u3068\u540c\u3058\u3088\u3046\u306b\u30da\u30fc\u30b8\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3068\u30da\u30fc\u30b8\u30c6\u30fc\u30d6\u30eb\u306e2\u6bb5\u968e\u69cb\u6210\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3067\u3057\u3087\u3046\u306d\u3002
\n\u304c\u3057\u304b\u3057\u5177\u4f53\u7684\u306b\u3069\u3046\u66f8\u304d\u306a\u304a\u305b\u3070\u3044\u3044\u304b\u306f\u5206\u304b\u308a\u307e\u305b\u3093(\uff1b\u30fb\u2200\u30fb)<\/p>\n
4. \u306b\u3064\u3044\u3066<\/h3>\n
\u5b9f\u88c5\uff1f\u03a3(\uff9f\u0414\uff9f\uff1b\uff74\uff70\uff6f!
\n\u4e00\u5fdc\u8aad\u3080\u3053\u3068\u306b\u91cd\u70b9\u3092\u7f6e\u3044\u3066\u308b\u306e\u3067\u5b9f\u88c5\u306f\u3057\u307e\u305b\u3093\u304c\u3001\u3061\u3087\u3063\u3068\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002
\nxv6\u306e\u30b7\u30a7\u30eb\u306fsh.c\u3067\u5b9f\u88c5\u3055\u308c\u3066\u308b\u306e\u3067\u5f53\u7136\u305d\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u5909\u66f4\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002
\nruncmd\u95a2\u6570\u306ecase EXEC:\u306e\u90e8\u5206\u306e\u51e6\u7406\u306b\u8ffd\u52a0\u3059\u308c\u3070\u826f\u3055\u305d\u3046\u3067\u3059\u3002
\n\u30d5\u30a1\u30a4\u30eb\u306e1\u884c\u76ee\u3092\u8aad\u307f\u8fbc\u307f\u59a5\u5f53\u306a\u30b7\u30d0\u30f3\u306a\u3089\u305d\u3053\u304b\u3089\u30d7\u30ed\u30b0\u30e9\u30e0\u30d1\u30b9\u3092\u629c\u304d\u51fa\u3057\u3001\u305d\u308c\u3092exec\u306e\u7b2c\u4e00\u5f15\u6570\u3068\u3057\u3001\u5143\u306e\u30b3\u30de\u30f3\u30c9\u3068\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u7b2c\u4e8c\u5f15\u6570\u3068\u3057\u3066\u6e21\u305b\u3070\u826f\u3055\u305d\u3046\u3067\u3059\u3002<\/p>\n
5. \u306b\u3064\u3044\u3066<\/h3>\n
\u7b54\u3048\u306fYES\u3067\u3082\u3042\u308aNO\u3067\u3082\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002
\nKERNBASE\u306f\u4eee\u60f3\u30a2\u30c9\u30ec\u30b9\u7a7a\u9593\u4e0a\u306e\u4f4d\u7f6e\u306b\u904e\u304e\u305a\u3001\u7269\u7406\u30e1\u30e2\u30ea\u4e0a\u3067\u306f\u30ab\u30fc\u30cd\u30eb\u306f\u6700\u521d\u306e\u65b9\u306b\u4f4d\u7f6e\u3057\u3066\u3066\u3001\u305d\u306e\u4ed6\u8af8\u3005\u3092\u7701\u3044\u305f\u6b8b\u308a\u3092\u30e6\u30fc\u30b6\u30d7\u30ed\u30bb\u30b9\u304c\u5206\u3051\u5408\u3046\u3068\u3044\u3046\u5f62\u306b\u306a\u3063\u3066\u307e\u3059\u3002
\n\u306a\u306e\u3067\u8907\u6570\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u4f7f\u3048\u308b\u7269\u7406\u30e1\u30e2\u30ea\u306e\u5408\u8a08\u306f\u5909\u308f\u308a\u307e\u305b\u3093\u304c\u3001\u4e00\u3064\u306e\u30d7\u30ed\u30bb\u30b9\u306b\u9650\u308c\u30702GB\u307e\u3067\u4f7f\u7528\u53ef\u80fd\u306a\u306e\u304c\u3001\u3044\u304f\u3089\u304b\u5897\u3084\u305b\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n
\u611f\u60f3<\/h3>\n
Exercises\u306f\u307b\u3068\u3093\u3069\u7b54\u3048\u3089\u308c\u306a\u3044\u3093\u3058\u3083\u306a\u3044\u304b\u3068\u601d\u3063\u3066\u307e\u3057\u305f\u3002
\n\u59a5\u5f53\u306a\u5185\u5bb9\u304b\u3069\u3046\u304b\u306f\u5225\u3068\u3057\u3066\u3053\u308c\u3060\u3051\u53cd\u5fdc\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u4e8b\u304c\u3068\u3066\u3082\u5b09\u3057\u3044\u3067\u3059\u3002
\n\u3053\u306e\u30c6\u30ad\u30b9\u30c8\u3092\u8aad\u307f\u59cb\u3081\u308b\u524d\u306e\u81ea\u5206\u3060\u3068\u624b\u3082\u8db3\u3082\u51fa\u306a\u304b\u3063\u305f\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n
\u3042\u3068OS\u754c\u9688\u306e\u65b9\u306b\u306f\u5e38\u8b58\u306a\u306e\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001xv6\u306e\u8d77\u52d5\u30d7\u30ed\u30bb\u30b9\u3092gdb\u3067\u30c7\u30d0\u30c3\u30b0\u51fa\u6765\u308b\u4e8b\u306b\u611f\u52d5\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u305f\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[405],"class_list":["post-1339","post","type-post","status-publish","format-standard","hentry","category-tech","tag-xv6"],"_links":{"self":[{"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/posts\/1339","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/comments?post=1339"}],"version-history":[{"count":0,"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/posts\/1339\/revisions"}],"wp:attachment":[{"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/media?parent=1339"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/categories?post=1339"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/peta.okechan.net\/blog\/wp-json\/wp\/v2\/tags?post=1339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}