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<title>SystemTap: SystemTap Runtime Library</title>
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<div class="qindex"><a class="qindex" href="index.html">Intro</a> | <a class="qindex" href="globals_func.html">Functions</a> | <a class="qindex" href="globals_defs.html">Defines</a> | <a class="qindex" href="globals_enum.html">Enumerations</a> | <a class="qindex" href="globals_eval.html">Enumeration Values</a></div>
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<h1>io.c</h1><a href="io_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001
<a name="l00011"></a><a class="code" href="io_8c.html#a4">00011</a> <span class="keywordtype">void</span> <a class="code" href="io_8c.html#a4">dlog</a> (<span class="keyword">const</span> <span class="keywordtype">char</span> *fmt, ...)
00012 {
00013 va_list args;
00014 printk(<span class="stringliteral">"STP: "</span>);
00015 va_start(args, fmt);
00016 vprintk(fmt, args);
00017 va_end(args);
00018 }
00019
00020
00021 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> * (*_stp_kallsyms_lookup)(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr,
00022 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *symbolsize,
00023 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *offset,
00024 <span class="keywordtype">char</span> **modname, <span class="keywordtype">char</span> *namebuf)=(<span class="keywordtype">void</span> *)KALLSYMS_LOOKUP;
00025
00026
<a name="l00027"></a><a class="code" href="io_8c.html#a0">00027</a> <span class="preprocessor">#define STP_BUF_LEN 8191</span>
00028 <span class="preprocessor"></span>
00029 <span class="comment">/* FIXME. These need to be per-cpu */</span>
00030 <span class="keyword">static</span> <span class="keywordtype">char</span> _stp_pbuf[<a class="code" href="io_8c.html#a0">STP_BUF_LEN</a>+1];
00031 <span class="keyword">static</span> <span class="keywordtype">int</span> _stp_pbuf_len = <a class="code" href="io_8c.html#a0">STP_BUF_LEN</a>;
00032
<a name="l00033"></a><a class="code" href="io_8c.html#a5">00033</a> <span class="keywordtype">void</span> <a class="code" href="io_8c.html#a5">_stp_print_buf</a> (<span class="keyword">const</span> <span class="keywordtype">char</span> *fmt, ...)
00034 {
00035 <span class="keywordtype">int</span> num;
00036 va_list args;
00037 <span class="keywordtype">char</span> *buf = _stp_pbuf + <a class="code" href="io_8c.html#a0">STP_BUF_LEN</a> - _stp_pbuf_len;
00038 va_start(args, fmt);
00039 num = vscnprintf(buf, _stp_pbuf_len, fmt, args);
00040 va_end(args);
00041 <span class="keywordflow">if</span> (num > 0)
00042 _stp_pbuf_len -= num;
00043 }
00044
<a name="l00045"></a><a class="code" href="io_8c.html#a6">00045</a> <span class="keywordtype">void</span> <a class="code" href="io_8c.html#a6">_stp_print_buf_init</a> (<span class="keywordtype">void</span>)
00046 {
00047 _stp_pbuf_len = <a class="code" href="io_8c.html#a0">STP_BUF_LEN</a>;
00048 _stp_pbuf[0] = 0;
00049 }
00050
<a name="l00051"></a><a class="code" href="io_8c.html#a7">00051</a> <span class="keywordtype">void</span> <a class="code" href="io_8c.html#a7">_stp_print_symbol</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *fmt, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> address)
00052 {
00053 <span class="keywordtype">char</span> *modname;
00054 <span class="keyword">const</span> <span class="keywordtype">char</span> *name;
00055 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> offset, size;
00056 <span class="keywordtype">char</span> namebuf[KSYM_NAME_LEN+1];
00057
00058 name = _stp_kallsyms_lookup(address, &size, &offset, &modname, namebuf);
00059
00060 <span class="keywordflow">if</span> (!name)
00061 <a class="code" href="io_8c.html#a5">_stp_print_buf</a>(<span class="stringliteral">"0x%lx"</span>, address);
00062 <span class="keywordflow">else</span> {
00063 <span class="keywordflow">if</span> (modname)
00064 <a class="code" href="io_8c.html#a5">_stp_print_buf</a>(<span class="stringliteral">"%s+%#lx/%#lx [%s]"</span>, name, offset,
00065 size, modname);
00066 <span class="keywordflow">else</span>
00067 <a class="code" href="io_8c.html#a5">_stp_print_buf</a>(<span class="stringliteral">"%s+%#lx/%#lx"</span>, name, offset, size);
00068 }
00069 }
00070
00071
<a name="l00072"></a><a class="code" href="io_8c.html#a8">00072</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <a class="code" href="io_8c.html#a8">cur_ret_addr</a> (<span class="keyword">struct</span> pt_regs *regs)
00073 {
00074 <span class="preprocessor">#ifdef __x86_64__</span>
00075 <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;
00076 <span class="preprocessor">#else</span>
00077 <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;
00078 <span class="preprocessor">#endif</span>
00079 <span class="preprocessor"></span> <span class="keywordflow">if</span> (ra)
00080 <span class="keywordflow">return</span> *ra;
00081 <span class="keywordflow">else</span>
00082 <span class="keywordflow">return</span> 0;
00083 }
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