Mercurial > hg > Papers > 2020 > tobaru-master
view slide/CbCXv6.html @ 17:6afd90dba6db
slide chapter1
| author | tobaru |
|---|---|
| date | Fri, 07 Feb 2020 16:53:09 +0900 |
| parents | |
| children | afc36230cf4f |
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dotted}abbr[data-original-title],abbr[title]{cursor:help}body.modal-open{overflow-y:auto;padding-right:0!important} </style> <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries --> <!-- WARNING: Respond.js doesn't work if you view the page via file:// --> <!--[if lt IE 9]> <script src="https://cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv.min.js" integrity="sha256-3Jy/GbSLrg0o9y5Z5n1uw0qxZECH7C6OQpVBgNFYa0g=" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/respond.js/1.4.2/respond.min.js" integrity="sha256-g6iAfvZp+nDQ2TdTR/VVKJf3bGro4ub5fvWSWVRi2NE=" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/es5-shim/4.5.9/es5-shim.min.js" integrity="sha256-8E4Is26QH0bD52WoQpcB+R/tcWQtpzlCojrybUd7Mxo=" crossorigin="anonymous"></script> <![endif]--> </head> <body> <div id="doc" class="markdown-body container-fluid comment-enabled" data-hard-breaks="true" style="position: relative;"><h1 id="CbCインターフェースによる-CbCXv6-の書き換え" style=""><a class="anchor hidden-xs" href="#CbCインターフェースによる-CbCXv6-の書き換え" title="CbCインターフェースによる-CbCXv6-の書き換え"><span class="octicon octicon-link"></span></a>CbCインターフェースによる CbCXv6 の書き換え</h1><ul> <li>並列信頼研</li> <li>桃原 優</li> </ul><hr><h1 id="目次0" style=""><a class="anchor hidden-xs" href="#目次0" title="目次0"><span class="octicon octicon-link"></span></a>目次</h1><ol> <li><strong>OS の信頼性の保障</strong></li> <li>CbC による Gears OS の開発</li> <li>Xv6</li> <li>CbCXv6 での Paging</li> <li>CbC インターフェース</li> <li>評価</li> <li>まとめ</li> </ol><hr><h1 id="OS-の信頼性の重要性" style=""><a class="anchor hidden-xs" href="#OS-の信頼性の重要性" title="OS-の信頼性の重要性"><span class="octicon octicon-link"></span></a>OS の信頼性の重要性</h1><ul> <li>OS のバグは日常生活に支障をきたす <ul> <li>パスワードなしで root にアクセスできるバグ</li> <li>日付設定でコンピュータが壊れる</li> <li>-> OS自体に信頼性が求められる</li> </ul> </li> </ul><hr><h1 id="OS-の信頼性の重要性1" style=""><a class="anchor hidden-xs" href="#OS-の信頼性の重要性1" title="OS-の信頼性の重要性1"><span class="octicon octicon-link"></span></a>OS の信頼性の重要性</h1><ul> <li> <p>全てのOSのコードに対して検証を行うのは困難</p> <ul> <li>複雑な機能が多い</li> <li>短期間のアップデート</li> </ul> </li> <li> <p>ユーザーが検証を行うこともできない</p> <ul> <li>資源管理はOSが行なってる</li> <li>そもそも資源管理が複雑</li> <li>アクセスされたり書き換えられるリスク</li> </ul> </li> </ul><hr><h1 id="メタレベルとノーマルレベル" style=""><a class="anchor hidden-xs" href="#メタレベルとノーマルレベル" title="メタレベルとノーマルレベル"><span class="octicon octicon-link"></span></a>メタレベルとノーマルレベル</h1><ul> <li>ノーマルレベル <ul> <li>ユーザーがプログラミング言語によって記述する部分の処理</li> </ul> </li> <li>メタレベル <ul> <li>ユーザーが記述しないOS 側の処理 <ul> <li>CPU</li> <li>メモリ</li> </ul> </li> </ul> </li> </ul><hr><h1 id="Continuation-based-C" style=""><a class="anchor hidden-xs" href="#Continuation-based-C" title="Continuation-based-C"><span class="octicon octicon-link"></span></a>Continuation based C</h1><ul> <li> <p>ノーマルレベルとメタレベルの処理を同じ言語で行えるようにした言語(以下CbC)</p> </li> <li> <p>Code Gear</p> <ul> <li>基本的な処理の単位</li> </ul> </li> <li> <p>Data Gear</p> <ul> <li>データの単位</li> </ul> </li> </ul><hr><h1 id="goto-による継続" style=""><a class="anchor hidden-xs" href="#goto-による継続" title="goto-による継続"><span class="octicon octicon-link"></span></a>goto による継続</h1><ul> <li>Code Gear の処理の間を goto によって遷移していく</li> </ul><p><img src="https://i.imgur.com/etfQund.png" alt=""></p><hr><h1 id="Data-Gear-の継続" style=""><a class="anchor hidden-xs" href="#Data-Gear-の継続" title="Data-Gear-の継続"><span class="octicon octicon-link"></span></a>Data Gear の継続</h1><ul> <li>goto の際に Data Gear も継続される</li> </ul><p><img src="https://i.imgur.com/3E0DGWA.png" alt=""></p><hr><h1 id="Meta-Code-Gear" style=""><a class="anchor hidden-xs" href="#Meta-Code-Gear" title="Meta-Code-Gear"><span class="octicon octicon-link"></span></a>Meta Code Gear</h1><ul> <li>実際にはノーマルレベルの間にメタレベルの処理がある</li> <li>Meta Level では Data Gear の見え方は変わる(Meta Data Gear)</li> </ul><p><img src="https://i.imgur.com/vy0NxrG.png" alt=""></p><hr><h1 id="状態遷移モデル" style=""><a class="anchor hidden-xs" href="#状態遷移モデル" title="状態遷移モデル"><span class="octicon octicon-link"></span></a>状態遷移モデル</h1><ul> <li>goto の遷移によって状態遷移モデルに落とし込める</li> <li>Code Gear に対しての入力に対して期待される出力がされているかで検査して<strong>信頼性を保証する</strong></li> </ul><hr><h1 id="Agda-による検証" style=""><a class="anchor hidden-xs" href="#Agda-による検証" title="Agda-による検証"><span class="octicon octicon-link"></span></a>Agda による検証</h1><ul> <li>モデル検査 <ul> <li>定理証明支援系である Agda を用いる。</li> </ul> </li> <li>Agda <ul> <li>Haure Logic という検証手法を扱える。</li> </ul> </li> </ul><hr><h1 id="Haure-Logic" style=""><a class="anchor hidden-xs" href="#Haure-Logic" title="Haure-Logic"><span class="octicon octicon-link"></span></a>Haure Logic</h1><ul> <li>検証手法 <ul> <li>事前条件を使ってある関数を実行して事後条件を満たすことを確認する</li> </ul> </li> <li>CbCと相性がいい <ul> <li>継続に事前条件(Input Data Gear)と事後条件(Output Data Gear)を持たせることができる</li> </ul> </li> </ul><hr><h1 id="Geas-OS" style=""><a class="anchor hidden-xs" href="#Geas-OS" title="Geas-OS"><span class="octicon octicon-link"></span></a>Geas OS</h1><ul> <li>CbC を使って信頼性の保証と拡張性を持たせる Gears OS の開発を行なっている</li> <li>Xv6 という OS を参考に書き換えをしている</li> </ul><hr><h1 id="メモリ管理" style=""><a class="anchor hidden-xs" href="#メモリ管理" title="メモリ管理"><span class="octicon octicon-link"></span></a>メモリ管理</h1><ul> <li>OS の信頼性の1つであるメモリ管理部分を CbC で書き換える <ul> <li>Page のバリデーションチェック</li> <li>サンドボックスによるエクセプション</li> </ul> </li> </ul><hr><h1 id="インターフェース" style=""><a class="anchor hidden-xs" href="#インターフェース" title="インターフェース"><span class="octicon octicon-link"></span></a>インターフェース</h1><ul> <li> <p>書き換えを防ぐために見える Data Gear に違いが生じる</p> </li> <li> <p>-> Gears OS のノーマルレベルからメタレベルの記述が記述が煩雑になるためインターフェースを導入</p> </li> <li> <p>機能の入れ替えによる他のメリット</p> <ul> <li>機能の入れ替え</li> <li>Agda による証明</li> </ul> </li> </ul></div> <div class="ui-toc dropup unselectable hidden-print" style="display:none;"> <div class="pull-right dropdown"> <a id="tocLabel" class="ui-toc-label btn btn-default" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false" title="Table of content"> <i class="fa fa-bars"></i> </a> <ul id="ui-toc" class="ui-toc-dropdown dropdown-menu" aria-labelledby="tocLabel"> <div class="toc"><ul class="nav"> <li><a href="#CbCインターフェースによる-CbCXv6-の書き換え" title="CbCインターフェースによる CbCXv6 の書き換え">CbCインターフェースによる CbCXv6 の書き換え</a></li> <li><a href="#目次0" title="目次">目次</a></li> <li><a href="#OS-の信頼性の重要性" title="OS の信頼性の重要性">OS の信頼性の重要性</a></li> <li><a href="#OS-の信頼性の重要性1" title="OS の信頼性の重要性">OS の信頼性の重要性</a></li> <li><a href="#メタレベルとノーマルレベル" title="メタレベルとノーマルレベル">メタレベルとノーマルレベル</a></li> <li><a href="#Continuation-based-C" title="Continuation based C">Continuation based C</a></li> <li><a href="#goto-による継続" title="goto による継続">goto による継続</a></li> <li><a href="#Data-Gear-の継続" title="Data Gear の継続">Data Gear の継続</a></li> <li><a href="#Meta-Code-Gear" title="Meta Code Gear">Meta Code Gear</a></li> <li><a href="#状態遷移モデル" title="状態遷移モデル">状態遷移モデル</a></li> <li><a href="#Agda-による検証" title="Agda による検証">Agda による検証</a></li> <li><a href="#Haure-Logic" title="Haure Logic">Haure Logic</a></li> <li class=""><a href="#Geas-OS" title="Geas OS">Geas OS</a></li> <li><a href="#メモリ管理" title="メモリ管理">メモリ管理</a></li> <li><a href="#インターフェース" title="インターフェース">インターフェース</a></li> </ul> </div><div class="toc-menu"><a class="expand-toggle" href="#">Expand all</a><a class="back-to-top" href="#">Back to top</a><a class="go-to-bottom" href="#">Go to bottom</a></div> </ul> </div> </div> <div id="ui-toc-affix" class="ui-affix-toc ui-toc-dropdown unselectable hidden-print" data-spy="affix" style="top:17px;display:none;" null null> <div class="toc"><ul class="nav"> <li><a href="#CbCインターフェースによる-CbCXv6-の書き換え" title="CbCインターフェースによる CbCXv6 の書き換え">CbCインターフェースによる CbCXv6 の書き換え</a></li> <li><a href="#目次0" title="目次">目次</a></li> <li><a href="#OS-の信頼性の重要性" title="OS の信頼性の重要性">OS の信頼性の重要性</a></li> <li><a href="#OS-の信頼性の重要性1" title="OS の信頼性の重要性">OS の信頼性の重要性</a></li> <li><a href="#メタレベルとノーマルレベル" title="メタレベルとノーマルレベル">メタレベルとノーマルレベル</a></li> <li><a href="#Continuation-based-C" title="Continuation based C">Continuation based C</a></li> <li><a href="#goto-による継続" title="goto による継続">goto による継続</a></li> <li><a href="#Data-Gear-の継続" title="Data Gear の継続">Data Gear の継続</a></li> <li><a href="#Meta-Code-Gear" title="Meta Code Gear">Meta Code Gear</a></li> <li><a href="#状態遷移モデル" title="状態遷移モデル">状態遷移モデル</a></li> <li><a href="#Agda-による検証" title="Agda による検証">Agda による検証</a></li> <li><a href="#Haure-Logic" title="Haure Logic">Haure Logic</a></li> <li class=""><a href="#Geas-OS" title="Geas OS">Geas OS</a></li> <li><a href="#メモリ管理" title="メモリ管理">メモリ管理</a></li> <li><a href="#インターフェース" title="インターフェース">インターフェース</a></li> </ul> </div><div class="toc-menu"><a class="expand-toggle" href="#">Expand all</a><a class="back-to-top" href="#">Back to top</a><a class="go-to-bottom" href="#">Go to bottom</a></div> </div> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js" integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8=" crossorigin="anonymous"></script> <script 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