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Solutions and Notes for Labs of Computer Systems: A Programmer's Perspective 3rd Editon // 《深入理解计算机系统》第三版的实验文件、解答与笔记

Perl 4.46% Makefile 22.99% C 54.44% Lex 0.27% Yacc 0.20% HCL 11.34% Tcl 4.74% Python 0.50% Shell 1.03% HTML 0.01% Raku 0.02%
csapp notebook linux c computer-architecture computer-science

csapp-labs's Introduction

CSAPP-Labs

这个项目是我对《深入理解计算机系统》第三版配套实验的解答和我写的笔记，实验文件在目录labs下，来源Lab Assignments。

目录：

labs

包含所有的lab文件，以及CMU给的参考文档，也包含我写的解答文件，我的实验环境是 Ubuntu 16.04 amd-64，其中source保存了所有lab的原文件；

notes

是我写的笔记：

涉及了位运算，补码和浮点数等内容，都是C语言程序设计题。

拆除二进制炸弹，可以大大提升看汇编代码的能力。

这个lab主要涉及了栈随机化，不可执行等栈保护的方法和使栈溢出、ROP攻击等内容。

Architecture Lab，涉及了Y86-64指令集，和SEQ和PIPE的实现方式，以及程序优化等内容，可以熟悉汇编和硬件语言HCL。

这个lab在CMU已经被Cache Lab取代了，考虑到Cache Lab比较难，可以先做这个lab练练手。基于书上第五、六章对程序进行优化，主要用了循环分块消除缓存不命中和消除分支预测错误等方法。

Part A要求写一个缓存模拟器，Part B要求优化矩阵转置函数，减少缓存不命中数。这个lab可以加深对缓存的理解。已写完Part A。

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csapp-labs's Issues

archlab中循环展开优化bug解决

笔记中提到的archlab的Part C部分循环展开优化时，将8次展开和4次展开相结合出现的问题（参考文件labs/archlab/sim/pipe/mncopy.ys）应该是由于跳转的名称出现重复（8次和4词都从ele1开始编号，但是终止语句并不相同）导致问题。经过实验把4次循环的ele名称和之前的区分开来即可通过全部测试并将Average CPE降到8.64。

attack lab第三题是直接修改了strncmp的参数吧

直接将strncmp的第二个参数sval修改为我们的cookie
使得匹配成功
对把

哦 ， 这个hexmatch已经默认将两个待匹配的字符串设置为相等的直了
中间用sprintf把s改为hex
所以只需要把cookie的hex给rdi，rdi会给rsi

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