# HG changeset patch # User anatofuz # Date 1590557561 -32400 # Node ID b11a5c6c29050b0442582ae843ec5335a39772bb # Parent f68cad98da695a79e0ccd64d268b7e04f0b0f481 add css diff -r f68cad98da69 -r b11a5c6c2905 slide/assets/logo.svg --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/slide/assets/logo.svg Wed May 27 14:32:41 2020 +0900 @@ -0,0 +1,683 @@ + + + +image/svg+xml \ No newline at end of file diff -r f68cad98da69 -r b11a5c6c2905 slide/slide.html --- a/slide/slide.html Tue May 26 18:36:10 2020 +0900 +++ b/slide/slide.html Wed May 27 14:32:41 2020 +0900 @@ -1,4 +1,4 @@ -
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svg[data-marp-fitting=svg]{position:static}}div#p>svg>foreignObject>section svg[data-marp-fitting=svg].__reflow__{content:""}@supports (-ms-ime-align:auto){div#p>svg>foreignObject>section svg[data-marp-fitting=svg].__reflow__{position:relative}}div#p>svg>foreignObject>section [data-marp-fitting-svg-content]{display:table;white-space:nowrap}div#p>svg>foreignObject>section [data-marp-fitting-svg-content-wrap]{white-space:pre}div#p>svg>foreignObject>section img[data-marp-twemoji]{background:transparent;height:1em;margin:0 .05em 0 .1em;vertical-align:-.1em;width:1em} + +/* @theme example */div#p>svg>foreignObject>section{background-image:url("assets/logo.svg");background-position:right 3% bottom 2%;background-repeat:no-repeat;background-attachment:5%;background-size:20% auto} + +/* @theme aiuhs9plvkf3wiwce2rs80ez7rcgddscms99vcbt5g6 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xv6の構成要素の継続の分析

  • 清水 隆博 @@ -23,7 +27,7 @@
-
+

研究目的

  • アプリケーションの信頼性を向上させるたい @@ -44,7 +48,7 @@
-
+

OSの信頼性

  • OSそのもの動作も保証されるべき
  • @@ -67,7 +71,7 @@
  • ノーマル、メタレベルの計算の両方を保証しないといけない
-
+

テスト以外で信頼性を高める方法

  • モデル検査 @@ -93,7 +97,7 @@
  • OSをこれらの方法で信頼性を高めたい
-
+

OSの信頼性を高めるためには

  • 既存のOSのソースコードをそのまま使うのは困難
  • @@ -116,24 +120,126 @@
-
+

Continuation Based C

    -
  • ノーマルレベル/メタレベルの実装に適している言語
  • +
  • ノーマルレベル/メタレベルの実装に適している言語 +
      +
    • 通称CbC
    • +
    +
  • C言語の下位言語であり、 いくつかのCコンパイラ上で実装している
    • gcc
    • llvm/clang
  • +
  • C言語の構文は使用可能だが、 関数呼び出しの他に軽量継続を持つ +
      +
    • 関数呼び出し時のスタックの操作を行わずjmp命令で次の処理に移動する
    • +
    • schemaなどと違い環境を持たず継続するために軽量継続と呼ぶ
    • +
    +
  • +
+
+
+

CbCとCodeGear

+
    +
  • 軽量継続で表現する単位をCodeGearと呼ぶ
  • +
  • CodeGearはCの関数とアセンブラの中間の様に使える
  • +
  • CodeGearは返り値の型の代わりに__codeで宣言する
  • +
+
__code cbc_read(__code (*next)(int ret)){
+    struct file *f;
+    int n;
+    char *p;
+
+    if(argfd(0, 0, &f) < 0 || argint(2, &n) < 0 || argptr(1, &p, n) < 0) {
+        goto next(-1);
+    }
+    goto cbc_fileread(f, p, n, next);
+}
+
+
    +
  • cbcで書き直したxv6のreadシステムコールの例
-
\ No newline at end of file diff -r f68cad98da69 -r b11a5c6c2905 slide/slide.md --- a/slide/slide.md Tue May 26 18:36:10 2020 +0900 +++ b/slide/slide.md Wed May 27 14:32:41 2020 +0900 @@ -1,3 +1,10 @@ +--- +marp: true +title: xv6の構成要素の継続の分析 +paginate: true +--- + + # xv6の構成要素の継続の分析 - 清水 隆博 @@ -61,6 +68,78 @@ --- # Continuation Based C - ノーマルレベル/メタレベルの実装に適している言語 + - 通称CbC - C言語の下位言語であり、 いくつかのCコンパイラ上で実装している - gcc - llvm/clang +- C言語の構文は使用可能だが、 関数呼び出しの他に軽量継続を持つ + - 関数呼び出し時のスタックの操作を行わず`jmp`命令で次の処理に移動する + - schemaなどと違い環境を持たず継続するために軽量継続と呼ぶ + +--- +# CbCとCodeGear +- 軽量継続で表現する単位をCodeGearと呼ぶ +- CodeGearはCの関数とアセンブラの中間の様に使える +- CodeGearは返り値の型の代わりに`__code`で宣言する + +``` +__code cbc_read(__code (*next)(int ret)){ + struct file *f; + int n; + char *p; + + if(argfd(0, 0, &f) < 0 || argint(2, &n) < 0 || argptr(1, &p, n) < 0) { + goto next(-1); + } + goto cbc_fileread(f, p, n, next); +} +``` +- cbcで書き直したxv6の`read`システムコールの例 + +--- +# CbCの呼び出し + +- CbCは`goto`文で呼び出す +- cbcで書き直したシステムコールディスパッチの例 + - 受け取ったシステムコール番号に対応するCodeGearに継続する + +```c +void syscall(void) +{ + int num; + int ret; + + if((num >= NELEM(syscalls)) && (num <= NELEM(cbccodes)) && cbccodes[num]) { + proc->cbc_arg.cbc_console_arg.num = num; + goto (cbccodes[num])(cbc_ret); + } +``` + +- 呼び出し元には返ってこない + +--- +# CbCを用いたOSの再実装 +- CbCのCodeGearは状態遷移単位での記述に向いている +- 状態遷移を基本としたモデルに変換し、HoareLogicなどの形式手法を用いて信頼性を高めたい +- CbCは比較的文法が簡易 + - Agda/Coqなどの定理証明からCbCへのコード変換が可能であると考えている +- CbCや定理証明系を用いてアプリケーションとOSを再実装したい + - 最初の段階として既存のOSをCbCで再実装する + +--- +# xv6 +- マサチューセッツ工科大学で開発されたv6OSをもとにしたOS + - x86向けにANSI Cで実装されている +- 比較的小さなUNIX + - 基本的な機能は実装されている + - システムコール、 ファイルシステム、 プロセス処理... +- Raspberry Pi上で動作を目指したARM用のバージョンも存在する + - やっぱりRaspberryPiで動かしたい + - 今回は ARMのバージョンをCbCで再実装する + +--- + +# test + +- aa +- aa diff -r f68cad98da69 -r b11a5c6c2905 slide/themes/.keep --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/slide/themes/.keep Wed May 27 14:32:41 2020 +0900 @@ -0,0 +1,1 @@ +Please add your themes into `themes` directory for using in the deck. diff -r f68cad98da69 -r b11a5c6c2905 slide/themes/example.css --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/slide/themes/example.css Wed May 27 14:32:41 2020 +0900 @@ -0,0 +1,11 @@ +/* @theme example */ + +@import 'default'; + +section { + background-image: url("assets/logo.svg"); + background-position: right 3% bottom 2%; + background-repeat: no-repeat; + background-attachment: 5%; + background-size: 20% auto; +}