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CoderSherlock
2018-02-23 15:42:20 -05:00
parent 2522eb7da1
commit 0114b21336
7 changed files with 32 additions and 38 deletions
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@@ -6,8 +6,8 @@
</description>
<link>https://codersherlock.github.com//</link>
<atom:link href="https://codersherlock.github.com//feed.xml" rel="self" type="application/rss+xml"/>
<pubDate>Fri, 23 Feb 2018 15:23:54 -0500</pubDate>
<lastBuildDate>Fri, 23 Feb 2018 15:23:54 -0500</lastBuildDate>
<pubDate>Fri, 23 Feb 2018 15:42:08 -0500</pubDate>
<lastBuildDate>Fri, 23 Feb 2018 15:42:08 -0500</lastBuildDate>
<generator>Jekyll v3.7.2</generator>
<item>
@@ -25,9 +25,7 @@
&lt;p&gt;This interface-like function will then pass the function name, in this case function, to &lt;em&gt;usys.S&lt;/em&gt;. When using user mode function in programs, &lt;em&gt;usys.S&lt;/em&gt; will generate a reference to SYS_function and push system call number of this function into %eax. After that, system can know from &lt;em&gt;syscall.c&lt;/em&gt; and determining whether this system call is available. We must define same name system function and add it into &lt;em&gt;syscall.h&lt;/em&gt; and &lt;em&gt;syscall.c&lt;/em&gt;.&lt;/p&gt;
&lt;div class=&quot;language-c highlighter-rouge&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;cp&quot;&gt;#define SYS_function ## // ## is the system call number
&lt;/span&gt;
&lt;span class=&quot;p&quot;&gt;[&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;SYS_function&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;]&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;sys_function&lt;/span&gt; &lt;span class=&quot;c1&quot;&gt;// real system function name&lt;/span&gt;
&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;[&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;SYS_function&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;]&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;sys_function&lt;/span&gt; &lt;span class=&quot;c1&quot;&gt;// real system function name&lt;/span&gt;
&lt;span class=&quot;k&quot;&gt;extern&lt;/span&gt; &lt;span class=&quot;kt&quot;&gt;int&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;sys_function&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;kt&quot;&gt;void&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;);&lt;/span&gt; &lt;span class=&quot;c1&quot;&gt;// real system function declaration&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;&lt;/div&gt;