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Pengzhan Hao
2020-09-15 19:45:37 -04:00
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_site/archivers/charles-is-not-a-good-tool.html
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<link rel="stylesheet" href="/css/main.css">
<link rel="stylesheet" href="/css/timeline.css">
<link rel="canonical" href="https://codersherlock.github.com//archivers/charles-is-not-a-good-tool">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
@@ -43,9 +44,7 @@
<a class="page-link" href="/about/">About</a>
<a class="page-link" href="/about/">About Me</a>
@@ -129,16 +128,14 @@ You also need to save charles Root Certificate, it also contains in the same men
</div>
<div class="col-second">
<div class="col-box col-box-author">
<img class="avatar" src="/static/avatar.jpg" alt="Pengzhan Hao - 碾子">
<div class="col-box-title name">Pengzhan Hao - 碾子</div>
<img class="avatar" src="/static/avatar.jpg" alt="Pengzhan Hao">
<div class="col-box-title name">Pengzhan Hao</div>
<p></p>
<p class="contact">
<a href="https://github.com/codersherlock">GitHub</a>
<a href="https://twitter.com/haopengzhan">Twitter</a>
<a href="mailto:haopengzhan@gmail.com">Email</a>
@@ -169,7 +166,7 @@ You also need to save charles Root Certificate, it also contains in the same men
<footer class="footer">
<div class="wrapper">
&copy; 2016 Pengzhan Hao - 碾子
&copy; 2016 Pengzhan Hao
</div>
</footer>
_site/archivers/hello.html
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<link rel="stylesheet" href="/css/main.css">
<link rel="stylesheet" href="/css/timeline.css">
<link rel="canonical" href="https://codersherlock.github.com//archivers/hello">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
@@ -43,9 +44,7 @@
<a class="page-link" href="/about/">About</a>
<a class="page-link" href="/about/">About Me</a>
@@ -101,16 +100,14 @@
</div>
<div class="col-second">
<div class="col-box col-box-author">
<img class="avatar" src="/static/avatar.jpg" alt="Pengzhan Hao - 碾子">
<div class="col-box-title name">Pengzhan Hao - 碾子</div>
<img class="avatar" src="/static/avatar.jpg" alt="Pengzhan Hao">
<div class="col-box-title name">Pengzhan Hao</div>
<p></p>
<p class="contact">
<a href="https://github.com/codersherlock">GitHub</a>
<a href="https://twitter.com/haopengzhan">Twitter</a>
<a href="mailto:haopengzhan@gmail.com">Email</a>
@@ -141,7 +138,7 @@
<footer class="footer">
<div class="wrapper">
&copy; 2016 Pengzhan Hao - 碾子
&copy; 2016 Pengzhan Hao
</div>
</footer>
_site/archivers/intro-xv6.html
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<link rel="stylesheet" href="/css/main.css">
<link rel="stylesheet" href="/css/timeline.css">
<link rel="canonical" href="https://codersherlock.github.com//archivers/intro-xv6">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
@@ -43,9 +44,7 @@
<a class="page-link" href="/about/">About</a>
<a class="page-link" href="/about/">About Me</a>
@@ -77,19 +76,17 @@
<article class="post-content">
<p>I hate xv6, a stupid, useless education-oriented system. In this article, I will generally talk about how to implement system call to this operating system.</p>
<hr />
<h2 id="xv6-systemcall">Xv6 Systemcall</h2>
<p>To invoke a system call, we have to first define a user mode function to be the interface of the kernel instruction in file <em>user.h</em>.</p>
<div class="language-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">void</span> <span class="n">function</span> <span class="p">(</span><span class="kt">void</span><span class="p">);</span>
<div class="language-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">void</span> <span class="nf">function</span> <span class="p">(</span><span class="kt">void</span><span class="p">);</span>
</code></pre></div></div>
<p>This interface-like function will then pass the function name, in this case function, to <em>usys.S</em>. When using user mode function in programs, <em>usys.S</em> will generate a reference to SYS_function and push system call number of this function into %eax. After that, system can know from <em>syscall.c</em> and determining whether this system call is available. We must define same name system function and add it into <em>syscall.h</em> and <em>syscall.c</em>.</p>
<div class="language-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#define SYS_function ## // ## is the system call number
</span><span class="p">[</span><span class="n">SYS_function</span><span class="p">]</span> <span class="n">sys_function</span> <span class="c1">// real system function name</span>
<span class="k">extern</span> <span class="kt">int</span> <span class="n">sys_function</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span> <span class="c1">// real system function declaration</span>
<span class="k">extern</span> <span class="kt">int</span> <span class="nf">sys_function</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span> <span class="c1">// real system function declaration</span>
</code></pre></div></div>
<p>After adding these sentences to syscall files, we can implement real function in specific place where you want to make the function works well.</p>
@@ -120,16 +117,14 @@
</div>
<div class="col-second">
<div class="col-box col-box-author">
<img class="avatar" src="/static/avatar.jpg" alt="Pengzhan Hao - 碾子">
<div class="col-box-title name">Pengzhan Hao - 碾子</div>
<img class="avatar" src="/static/avatar.jpg" alt="Pengzhan Hao">
<div class="col-box-title name">Pengzhan Hao</div>
<p></p>
<p class="contact">
<a href="https://github.com/codersherlock">GitHub</a>
<a href="https://twitter.com/haopengzhan">Twitter</a>
<a href="mailto:haopengzhan@gmail.com">Email</a>
@@ -160,7 +155,7 @@
<footer class="footer">
<div class="wrapper">
&copy; 2016 Pengzhan Hao - 碾子
&copy; 2016 Pengzhan Hao
</div>
</footer>
_site/archivers/some-of-my-previews-exper-work.html
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<link rel="stylesheet" href="/css/main.css">
<link rel="stylesheet" href="/css/timeline.css">
<link rel="canonical" href="https://codersherlock.github.com//archivers/some-of-my-previews-exper-work">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">
<link rel="alternate" type="application/rss+xml" title="Stop Talking, Start Doing - 停止空想，开始行动" href="https://codersherlock.github.com//feed.xml" />
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
@@ -43,9 +44,7 @@
<a class="page-link" href="/about/">About</a>
<a class="page-link" href="/about/">About Me</a>
@@ -210,16 +209,14 @@ su
</div>
<div class="col-second">
<div class="col-box col-box-author">
<img class="avatar" src="/static/avatar.jpg" alt="Pengzhan Hao - 碾子">
<div class="col-box-title name">Pengzhan Hao - 碾子</div>
<img class="avatar" src="/static/avatar.jpg" alt="Pengzhan Hao">
<div class="col-box-title name">Pengzhan Hao</div>
<p></p>
<p class="contact">
<a href="https://github.com/codersherlock">GitHub</a>
<a href="https://twitter.com/haopengzhan">Twitter</a>
<a href="mailto:haopengzhan@gmail.com">Email</a>
@@ -250,7 +247,7 @@ su
<footer class="footer">
<div class="wrapper">
&copy; 2016 Pengzhan Hao - 碾子
&copy; 2016 Pengzhan Hao
</div>
</footer>