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<h1>current.c</h1><a href="current_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="preprocessor">#ifndef _CURRENT_C_</span>
00002 <span class="preprocessor"></span><span class="preprocessor">#define _CURRENT_C_</span>
00003 <span class="preprocessor"></span>
00004 <span class="comment">/* -*- linux-c -*- */</span><span class="comment"></span>
00005 <span class="comment">/** @file current.c</span>
00006 <span class="comment"> * @brief Functions to get the current state.</span>
00007 <span class="comment"> */</span><span class="comment"></span>
00008 <span class="comment">/** @addtogroup current Current State</span>
00009 <span class="comment"> * Functions to get the current state.</span>
00010 <span class="comment"> * @{</span>
00011 <span class="comment"> */</span>
00012
00013 <span class="comment"></span>
00014 <span class="comment">/** Get the current return address.</span>
00015 <span class="comment"> * Call from kprobes (not jprobes).</span>
00016 <span class="comment"> * @param regs The pt_regs saved by the kprobe.</span>
00017 <span class="comment"> * @return The return address saved in esp or rsp.</span>
00018 <span class="comment"> * @note i386 and x86_64 only so far.</span>
00019 <span class="comment"> */</span>
00020
<a name="l00021"></a><a class="code" href="group__current.html#ga0">00021</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <a class="code" href="group__current.html#ga0">_stp_ret_addr</a> (<span class="keyword">struct</span> pt_regs *regs)
00022 {
00023 <span class="preprocessor">#ifdef __x86_64__</span>
00024 <span class="preprocessor"></span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *ra = (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *)regs->rsp;
00025 <span class="preprocessor">#else</span>
00026 <span class="preprocessor"></span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *ra = (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *)regs->esp;
00027 <span class="preprocessor">#endif</span>
00028 <span class="preprocessor"></span> <span class="keywordflow">if</span> (ra)
00029 <span class="keywordflow">return</span> *ra;
00030 <span class="keywordflow">else</span>
00031 <span class="keywordflow">return</span> 0;
00032 }<span class="comment"></span>
00033 <span class="comment">/** @} */</span>
00034 <span class="preprocessor">#endif </span><span class="comment">/* _CURRENT_C_ */</span>
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