浅谈在linux kernel中打印函数调用的堆栈的方法
<p>在Linux内核调试中，经常用到的打印函数调用堆栈的方法非常简单，只需在需要查看堆栈的函数中加入：</p>
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<strong>dump_stack(); 或 __backtrace(); 即可</strong></p>
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<span><strong>dump_stack()在~/kernel/ lib/Dump_stack.c中定义</strong></span></p>
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<code class="xhtml plain">void dump_stack(void)</code>
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<code class="xhtml plain">{</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">printk(KERN_NOTICE</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">"This architecture does not implement dump_stack()/n");</code>
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<code class="xhtml plain">}</code>
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<code class="xhtml plain">__backtrace()的定义在~/kernel/arch/arm/lib/backtrace.S中</code>
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<code class="xhtml spaces"> </code>
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<code class="xhtml plain">ENTRY(__backtrace)</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">mov r1, #0x10</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">mov r0, fp</code>
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在linux应用程序调试中，使用的方法是：</p>
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<code class="xhtml plain">backtrace</code>
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<code class="xhtml plain">backtrace_symbols</code>
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可以在函数中加入如下代码：</p>
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<code class="xhtml plain">void *bt; </code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">char **strings; </code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">size_t sz;</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">sz = backtrace(bt, 20); </code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">strings = backtrace_symbols(bt, sz); </code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">for(i = 0; i < sz; ++i) </code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">fprintf(stderr, "%s/n", strings);</code>
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<p>
以上就是小编为大家带来的浅谈在linux kernel中打印函数调用的堆栈的方法全部内容了，希望大家多多支持~</p>
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