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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>stack.c</h1><a href="stack_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001
00002
00003 <span class="preprocessor">#ifdef __x86_64__</span>
00004 <span class="preprocessor"></span><span class="comment">/* ripped out of arch/x86_64/kernel/traps.c */</span>
00005 <span class="preprocessor">#include <linux/kallsyms.h></span>
00006
00007 <span class="keyword">static</span> <span class="keywordtype">int</span> _stp_printk_address(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> address)
00008 {
00009 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> offset = 0, symsize;
00010 <span class="keyword">const</span> <span class="keywordtype">char</span> *symname;
00011 <span class="keywordtype">char</span> *modname;
00012 <span class="keywordtype">char</span> *delim = <span class="stringliteral">":"</span>;
00013 <span class="keywordtype">char</span> namebuf[128];
00014
00015 symname = _stp_kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
00016 <span class="keywordflow">if</span> (!symname)
00017 return printk("[<%016lx>]", address);
00018 if (!modname)
00019 modname = delim = "";
00020 return printk("<%016lx>{%s%s%s%s%+ld}<span class="stringliteral">",</span>
00021 <span class="stringliteral"> address,delim,modname,delim,symname,offset); </span>
00022 <span class="stringliteral">}</span>
00023 <span class="stringliteral"></span>
00024 <span class="stringliteral">void _stp_show_trace(unsigned long *stack)</span>
00025 <span class="stringliteral">{</span>
00026 <span class="stringliteral"> unsigned long addr;</span>
00027 <span class="stringliteral"> unsigned long *irqstack, *irqstack_end, *estack_end;</span>
00028 <span class="stringliteral"> const int cpu = safe_smp_processor_id();</span>
00029 <span class="stringliteral"> int i;</span>
00030 <span class="stringliteral"></span>
00031 <span class="stringliteral"> printk("</span>\nCall Trace:<span class="stringliteral">");</span>
00032 <span class="stringliteral"> i = 0; </span>
00033 <span class="stringliteral"> </span>
00034 <span class="stringliteral"> estack_end = in_exception_stack(cpu, (unsigned long)stack); </span>
00035 <span class="stringliteral"> if (estack_end) { </span>
00036 <span class="stringliteral"> while (stack < estack_end) { </span>
00037 <span class="stringliteral"> addr = *stack++; </span>
00038 <span class="stringliteral"> if (__kernel_text_address(addr)) {</span>
00039 <span class="stringliteral"> i += printk_address(addr);</span>
00040 <span class="stringliteral"> i += printk("</span> <span class="stringliteral">"); </span>
00041 <span class="stringliteral"> if (i > 50) {</span>
00042 <span class="stringliteral"> printk("</span>\n<span class="stringliteral">"); </span>
00043 <span class="stringliteral"> i = 0;</span>
00044 <span class="stringliteral"> }</span>
00045 <span class="stringliteral"> }</span>
00046 <span class="stringliteral"> }</span>
00047 <span class="stringliteral"> i += printk("</span> <EOE> <span class="stringliteral">"); </span>
00048 <span class="stringliteral"> i += 7;</span>
00049 <span class="stringliteral"> stack = (unsigned long *) estack_end[-2]; </span>
00050 <span class="stringliteral"> } </span>
00051 <span class="stringliteral"></span>
00052 <span class="stringliteral"> irqstack_end = (unsigned long *) (cpu_pda[cpu].irqstackptr);</span>
00053 <span class="stringliteral"> irqstack = (unsigned long *) (cpu_pda[cpu].irqstackptr - IRQSTACKSIZE + 64);</span>
00054 <span class="stringliteral"></span>
00055 <span class="stringliteral"> if (stack >= irqstack && stack < irqstack_end) {</span>
00056 <span class="stringliteral"> printk("</span><IRQ> <span class="stringliteral">"); </span>
00057 <span class="stringliteral"> while (stack < irqstack_end) {</span>
00058 <span class="stringliteral"> addr = *stack++;</span>
00059 <span class="stringliteral"> /*</span>
00060 <span class="stringliteral"> * If the address is either in the text segment of the</span>
00061 <span class="stringliteral"> * kernel, or in the region which contains vmalloc'ed</span>
00062 <span class="stringliteral"> * memory, it *may* be the address of a calling</span>
00063 <span class="stringliteral"> * routine; if so, print it so that someone tracing</span>
00064 <span class="stringliteral"> * down the cause of the crash will be able to figure</span>
00065 <span class="stringliteral"> * out the call path that was taken.</span>
00066 <span class="stringliteral"> */</span>
00067 <span class="stringliteral"> if (__kernel_text_address(addr)) {</span>
00068 <span class="stringliteral"> i += printk_address(addr);</span>
00069 <span class="stringliteral"> i += printk("</span> <span class="stringliteral">"); </span>
00070 <span class="stringliteral"> if (i > 50) { </span>
00071 <span class="stringliteral"> printk("</span>\n <span class="stringliteral">");</span>
00072 <span class="stringliteral"> i = 0;</span>
00073 <span class="stringliteral"> } </span>
00074 <span class="stringliteral"> }</span>
00075 <span class="stringliteral"> } </span>
00076 <span class="stringliteral"> stack = (unsigned long *) (irqstack_end[-1]);</span>
00077 <span class="stringliteral"> printk("</span> <EOI> <span class="stringliteral">");</span>
00078 <span class="stringliteral"> i += 7;</span>
00079 <span class="stringliteral"> } </span>
00080 <span class="stringliteral"></span>
00081 <span class="stringliteral"> while (((long) stack & (THREAD_SIZE-1)) != 0) {</span>
00082 <span class="stringliteral"> addr = *stack++;</span>
00083 <span class="stringliteral"> if (__kernel_text_address(addr)) {</span>
00084 <span class="stringliteral"> i += printk_address(addr);</span>
00085 <span class="stringliteral"> i += printk("</span> <span class="stringliteral">"); </span>
00086 <span class="stringliteral"> if (i > 50) { </span>
00087 <span class="stringliteral"> printk("</span>\n <span class="stringliteral">");</span>
00088 <span class="stringliteral"> i = 0;</span>
00089 <span class="stringliteral"> } </span>
00090 <span class="stringliteral"> }</span>
00091 <span class="stringliteral"> }</span>
00092 <span class="stringliteral"> printk("</span>\n<span class="stringliteral">");</span>
00093 <span class="stringliteral">}</span>
00094 <span class="stringliteral"></span>
00095 <span class="stringliteral">void _stp_dump_stack(void)</span>
00096 <span class="stringliteral">{</span>
00097 <span class="stringliteral"> unsigned long dummy;</span>
00098 <span class="stringliteral"> show_trace(&dummy);</span>
00099 <span class="stringliteral">}</span>
00100 <span class="stringliteral"></span>
00101 <span class="stringliteral">#else /* i386 */</span>
00102 <span class="stringliteral"></span>
00103 <span class="stringliteral">static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)</span>
00104 <span class="stringliteral">{</span>
00105 <span class="stringliteral"> return p > (void *)tinfo &&</span>
00106 <span class="stringliteral"> p < (void *)tinfo + THREAD_SIZE - 3;</span>
00107 <span class="stringliteral">}</span>
00108 <span class="stringliteral"></span>
<a name="l00109"></a><a class="code" href="stack_8c.html#a1">00109</a> <span class="stringliteral">int __kernel_text_address(unsigned long addr)</span>
00110 <span class="stringliteral">{</span>
00111 <span class="stringliteral"> if (core_kernel_text(addr))</span>
00112 <span class="stringliteral"> return 1;</span>
00113 <span class="stringliteral"> return __module_text_address(addr) != NULL;</span>
00114 <span class="stringliteral">}</span>
00115 <span class="stringliteral"></span>
00116 <span class="stringliteral">static inline unsigned long _stp_print_context_stack(struct thread_info *tinfo,</span>
00117 <span class="stringliteral"> unsigned long *stack, unsigned long ebp)</span>
00118 <span class="stringliteral">{</span>
00119 <span class="stringliteral"> unsigned long addr;</span>
00120 <span class="stringliteral"></span>
00121 <span class="stringliteral">#ifdef CONFIG_FRAME_POINTER</span>
00122 <span class="stringliteral"> while (valid_stack_ptr(tinfo, (void *)ebp)) {</span>
00123 <span class="stringliteral"> addr = *(unsigned long *)(ebp + 4);</span>
00124 <span class="stringliteral"> _stp_print_buf("</span> [<%08lx>] <span class="stringliteral">", addr);</span>
00125 <span class="stringliteral"> _stp_print_symbol("</span>%s<span class="stringliteral">", addr);</span>
00126 <span class="stringliteral"> _stp_print_buf("</span>\n<span class="stringliteral">");</span>
00127 <span class="stringliteral"> ebp = *(unsigned long *)ebp;</span>
00128 <span class="stringliteral"> }</span>
00129 <span class="stringliteral">#else</span>
00130 <span class="stringliteral"> while (valid_stack_ptr(tinfo, stack)) {</span>
00131 <span class="stringliteral"> addr = *stack++;</span>
00132 <span class="stringliteral"> if (__kernel_text_address(addr)) {</span>
00133 <span class="stringliteral"> _stp_print_buf("</span> [<%08lx>]<span class="stringliteral">", addr);</span>
00134 <span class="stringliteral"> _stp_print_symbol("</span> %s<span class="stringliteral">", addr);</span>
00135 <span class="stringliteral"> _stp_print_buf("</span>\n<span class="stringliteral">");</span>
00136 <span class="stringliteral"> }</span>
00137 <span class="stringliteral"> }</span>
00138 <span class="stringliteral">#endif</span>
00139 <span class="stringliteral"> return ebp;</span>
00140 <span class="stringliteral">}</span>
00141 <span class="stringliteral"></span>
<a name="l00142"></a><a class="code" href="stack_8c.html#a3">00142</a> <span class="stringliteral">void show_trace(struct task_struct *task, unsigned long * stack)</span>
00143 <span class="stringliteral">{</span>
00144 <span class="stringliteral"> unsigned long ebp;</span>
00145 <span class="stringliteral"></span>
00146 <span class="stringliteral"> if (!task)</span>
00147 <span class="stringliteral"> task = current;</span>
00148 <span class="stringliteral"></span>
00149 <span class="stringliteral"> if (task == current) {</span>
00150 <span class="stringliteral"> /* Grab ebp right from our regs */</span>
00151 <span class="stringliteral"> asm ("</span>movl %%ebp, %0<span class="stringliteral">" : "</span>=r<span class="stringliteral">" (ebp) : );</span>
00152 <span class="stringliteral"> } else {</span>
00153 <span class="stringliteral"> /* ebp is the last reg pushed by switch_to */</span>
00154 <span class="stringliteral"> ebp = *(unsigned long *) task->thread.esp;</span>
00155 <span class="stringliteral"> }</span>
00156 <span class="stringliteral"></span>
00157 <span class="stringliteral"> while (1) {</span>
00158 <span class="stringliteral"> struct thread_info *context;</span>
00159 <span class="stringliteral"> context = (struct thread_info *)</span>
00160 <span class="stringliteral"> ((unsigned long)stack & (~(THREAD_SIZE - 1)));</span>
00161 <span class="stringliteral"> ebp = _stp_print_context_stack(context, stack, ebp);</span>
00162 <span class="stringliteral"> stack = (unsigned long*)context->previous_esp;</span>
00163 <span class="stringliteral"> if (!stack)</span>
00164 <span class="stringliteral"> break;</span>
00165 <span class="stringliteral"> _stp_print_buf("</span> =======================\n<span class="stringliteral">");</span>
00166 <span class="stringliteral"> }</span>
00167 <span class="stringliteral">}</span>
00168 <span class="stringliteral"></span>
<a name="l00169"></a><a class="code" href="stack_8c.html#a4">00169</a> <span class="stringliteral">void dump_stack(void)</span>
00170 <span class="stringliteral">{</span>
00171 <span class="stringliteral"> unsigned long stack;</span>
00172 <span class="stringliteral"> show_trace(current, &stack);</span>
00173 <span class="stringliteral">}</span>
00174 <span class="stringliteral">#endif</span>
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Mar 21 13:29:45 2005 for SystemTap by
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