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<h1>stack.c</h1><a href="stack_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="preprocessor">#ifndef _STACK_C_ </span><span class="comment">/* -*- linux-c -*- */</span>
00002 <span class="preprocessor">#define _STACK_C_</span>
00003 <span class="preprocessor"></span>
00004 <span class="comment"></span>
00005 <span class="comment">/** @file stack.c</span>
00006 <span class="comment"> * @brief Stack Tracing Functions</span>
00007 <span class="comment"> */</span>
00008 <span class="comment"></span>
00009 <span class="comment">/** @addtogroup stack Stack Tracing Functions</span>
00010 <span class="comment"> * @{</span>
00011 <span class="comment"> */</span>
00012
00013 <span class="preprocessor">#include "sym.c"</span>
00014
00015 <span class="keyword">static</span> int (*_stp_kta)(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr)=(<span class="keywordtype">void</span> *)KTA;
00016
00017 <span class="preprocessor">#ifdef __x86_64__</span>
00018 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">void</span> __stp_stack_print (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *stack, <span class="keywordtype">int</span> verbose, <span class="keywordtype">int</span> levels)
00019 {
00020 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr;
00021
00022 <span class="keywordflow">if</span> (verbose)
00023 _stp_printf ("trace for %d (%s)\n", current->pid, current->comm);
00024
00025 while (((<span class="keywordtype">long</span>) stack & (THREAD_SIZE-1)) != 0) {
00026 addr = *stack++;
00027 <span class="keywordflow">if</span> (_stp_kta(addr)) {
00028 <span class="keywordflow">if</span> (verbose) {
00029 <a class="code" href="group__sym.html#ga2">_stp_symbol_print</a> (addr);
00030 <a class="code" href="group__print.html#ga11">_stp_print</a> (<span class="stringliteral">"\n"</span>);
00031 } <span class="keywordflow">else</span>
00032 <a class="code" href="group__print.html#ga3">_stp_printf</a> (<span class="stringliteral">"0x%lx "</span>, addr);
00033 }
00034 }
00035 <a class="code" href="group__print.html#ga2">_stp_print_flush</a>();
00036 }
00037
00038
00039 <span class="keyword">static</span> <span class="keywordtype">void</span> __stp_stack_sprint (String str, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *stack, <span class="keywordtype">int</span> verbose, <span class="keywordtype">int</span> levels)
00040 {
00041 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr;
00042 <span class="keywordflow">while</span> (((<span class="keywordtype">long</span>) stack & (THREAD_SIZE-1)) != 0) {
00043 addr = *stack++;
00044 <span class="keywordflow">if</span> (_stp_kta(addr)) {
00045 <span class="keywordflow">if</span> (verbose)
00046 _stp_symbol_sprint (str, addr);
00047 else
00048 _stp_sprintf (str, "0x%lx ", addr);
00049 }
00050 }
00051 }
00052
00053 #else <span class="comment">/* i386 */</span>
00054
00055 static inline <span class="keywordtype">int</span> valid_stack_ptr (struct thread_info *tinfo, <span class="keywordtype">void</span> *p)
00056 {
00057 <span class="keywordflow">return</span> p > (<span class="keywordtype">void</span> *)tinfo &&
00058 p < (<span class="keywordtype">void</span> *)tinfo + THREAD_SIZE - 3;
00059 }
00060
00061 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> _stp_print_context_stack (
00062 <span class="keyword">struct</span> thread_info *tinfo,
00063 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *stack,
00064 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> ebp )
00065 {
00066 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr;
00067
00068 <span class="preprocessor">#ifdef CONFIG_FRAME_POINTER</span>
00069 <span class="preprocessor"></span> <span class="keywordflow">while</span> (valid_stack_ptr(tinfo, (<span class="keywordtype">void</span> *)ebp)) {
00070 addr = *(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *)(ebp + 4);
00071 <a class="code" href="group__sym.html#ga2">_stp_symbol_print</a> (addr);
00072 <a class="code" href="group__print.html#ga5">_stp_print_cstr</a>(<span class="stringliteral">"\n"</span>);
00073 ebp = *(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *)ebp;
00074 }
00075 <span class="preprocessor">#else</span>
00076 <span class="preprocessor"></span> <span class="keywordflow">while</span> (valid_stack_ptr(tinfo, stack)) {
00077 addr = *stack++;
00078 <span class="keywordflow">if</span> (_stp_kta (addr)) {
00079 <a class="code" href="group__sym.html#ga2">_stp_symbol_print</a> (addr);
00080 <a class="code" href="group__print.html#ga5">_stp_print_cstr</a> (<span class="stringliteral">"\n"</span>);
00081 }
00082 }
00083 <span class="preprocessor">#endif</span>
00084 <span class="preprocessor"></span> <a class="code" href="group__print.html#ga2">_stp_print_flush</a>();
00085 <span class="keywordflow">return</span> ebp;
00086 }
00087
00088 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> _stp_sprint_context_stack (
00089 String str,
00090 <span class="keyword">struct</span> thread_info *tinfo,
00091 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *stack,
00092 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> ebp )
00093 {
00094 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> addr;
00095
00096 <span class="preprocessor">#ifdef CONFIG_FRAME_POINTER</span>
00097 <span class="preprocessor"></span> <span class="keywordflow">while</span> (valid_stack_ptr(tinfo, (<span class="keywordtype">void</span> *)ebp)) {
00098 addr = *(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *)(ebp + 4);
00099 <a class="code" href="group__sym.html#ga1">_stp_symbol_sprint</a> (str, addr);
00100 <a class="code" href="group__string.html#ga9">_stp_string_cat</a> (<span class="stringliteral">"\n"</span>);
00101 ebp = *(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *)ebp;
00102 }
00103 <span class="preprocessor">#else</span>
00104 <span class="preprocessor"></span> <span class="keywordflow">while</span> (valid_stack_ptr(tinfo, stack)) {
00105 addr = *stack++;
00106 <span class="keywordflow">if</span> (_stp_kta (addr)) {
00107 <a class="code" href="group__sym.html#ga1">_stp_symbol_sprint</a> (addr);
00108 <a class="code" href="group__string.html#ga9">_stp_string_cat</a> (<span class="stringliteral">"\n"</span>);
00109 }
00110 }
00111 <span class="preprocessor">#endif</span>
00112 <span class="preprocessor"></span> <span class="keywordflow">return</span> ebp;
00113 }
00114
00115 <span class="keyword">static</span> <span class="keywordtype">void</span> __stp_stack_print (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *stack, <span class="keywordtype">int</span> verbose, <span class="keywordtype">int</span> levels)
00116 {
00117 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> ebp;
00118
00119 <span class="comment">/* Grab ebp right from our regs */</span>
00120 <span class="keyword">asm</span> (<span class="stringliteral">"movl %%ebp, %0"</span> : <span class="stringliteral">"=r"</span> (ebp) : );
00121
00122 <span class="keywordflow">while</span> (stack) {
00123 <span class="keyword">struct </span>thread_info *context = (<span class="keyword">struct </span>thread_info *)
00124 ((<span class="keywordtype">unsigned</span> long)stack & (~(THREAD_SIZE - 1)));
00125 ebp = _stp_print_context_stack (context, stack, ebp);
00126 stack = (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>*)context->previous_esp;
00127 }
00128 }
00129
00130 <span class="keyword">static</span> <span class="keywordtype">void</span> __stp_stack_sprint (String str, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> *stack, <span class="keywordtype">int</span> verbose, <span class="keywordtype">int</span> levels)
00131 {
00132 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> ebp;
00133
00134 <span class="comment">/* Grab ebp right from our regs */</span>
00135 <span class="keyword">asm</span> (<span class="stringliteral">"movl %%ebp, %0"</span> : <span class="stringliteral">"=r"</span> (ebp) : );
00136
00137 <span class="keywordflow">while</span> (stack) {
00138 <span class="keyword">struct </span>thread_info *context = (<span class="keyword">struct </span>thread_info *)
00139 ((<span class="keywordtype">unsigned</span> long)stack & (~(THREAD_SIZE - 1)));
00140 ebp = _stp_sprint_context_stack (str, context, stack, ebp);
00141 stack = (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>*)context->previous_esp;
00142 }
00143 }
00144
00145 <span class="preprocessor">#endif </span><span class="comment">/* i386 */</span>
00146 <span class="comment"></span>
00147 <span class="comment">/** Print stack dump.</span>
00148 <span class="comment"> * Prints a stack dump to the print buffer.</span>
00149 <span class="comment"> * @param verbose Verbosity</span>
00150 <span class="comment"> * @param levels Number of levels to trace.</span>
00151 <span class="comment"> * @todo Implement verbosity and levels parameters.</span>
00152 <span class="comment"> * @bug levels parameter is not functional</span>
00153 <span class="comment"> */</span>
00154
<a name="l00155"></a><a class="code" href="group__stack.html#ga6">00155</a> <span class="keywordtype">void</span> <a class="code" href="group__stack.html#ga6">_stp_stack_print</a> (<span class="keywordtype">int</span> verbose, <span class="keywordtype">int</span> levels)
00156 {
00157 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> stack;
00158 __stp_stack_print (&stack, verbose, levels);
00159 }
00160 <span class="comment"></span>
00161 <span class="comment">/** Writes stack dump to a String</span>
00162 <span class="comment"> *</span>
00163 <span class="comment"> * @param str String</span>
00164 <span class="comment"> * @param verbose Verbosity</span>
00165 <span class="comment"> * @param levels Number of levels to trace.</span>
00166 <span class="comment"> * @returns Same String as was input.</span>
00167 <span class="comment"> * @todo Implement verbosity and levels parameters.</span>
00168 <span class="comment"> * @bug levels parameter is not functional</span>
00169 <span class="comment"> */</span>
00170
<a name="l00171"></a><a class="code" href="group__stack.html#ga7">00171</a> String <a class="code" href="group__stack.html#ga7">_stp_stack_sprint</a> (String str, <span class="keywordtype">int</span> verbose, <span class="keywordtype">int</span> levels)
00172 {
00173 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> stack;
00174 __stp_stack_sprint (str, &stack, verbose, levels);
00175 <a class="code" href="group__io.html#ga2">_stp_log</a> (<span class="stringliteral">"sss: str=%s\n"</span>, str->buf);
00176 <span class="keywordflow">return</span> str;
00177 }
00178 <span class="comment"></span>
00179 <span class="comment">/** @} */</span>
00180 <span class="preprocessor">#endif </span><span class="comment">/* _STACK_C_ */</span>
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