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| <section id="how-to-debug-nuttx-using-qemu-and-gdb"> |
| <span id="qemugdb"></span><h1>How to debug NuttX using QEMU and GDB<a class="headerlink" href="#how-to-debug-nuttx-using-qemu-and-gdb" title="Permalink to this heading"></a></h1> |
| <p>This guide explains the steps needed to use QEMU and GDB to debug |
| an ARM board (lm3s6965-ek), but it could be modified to work with other |
| board or architecture supported by QEMU.</p> |
| <p>Start configuring and compiling the lm3s6965-ek board with qemu-flat profile.</p> |
| <section id="compiling"> |
| <h2>Compiling<a class="headerlink" href="#compiling" title="Permalink to this heading"></a></h2> |
| <ol class="arabic"> |
| <li><p>Configure the lm3s6965-ek</p> |
| <p>There is a sample configuration to use lm3s6965-ek on QEMU.</p> |
| <p>Just use <code class="docutils literal notranslate"><span class="pre">lm3s6965-ek:qemu-flat</span></code> board profile for this purpose.</p> |
| <blockquote> |
| <div><div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">cd</span><span class="w"> </span>nuttx |
| <span class="gp">$ </span>./tools/configure.sh<span class="w"> </span>lm3s6965-ek:qemu-flat |
| </pre></div> |
| </div> |
| </div></blockquote> |
| </li> |
| <li><p>Compile</p> |
| <blockquote> |
| <div><div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>make<span class="w"> </span>-j |
| </pre></div> |
| </div> |
| </div></blockquote> |
| </li> |
| </ol> |
| </section> |
| <section id="start-qemu"> |
| <h2>Start QEMU<a class="headerlink" href="#start-qemu" title="Permalink to this heading"></a></h2> |
| <ol class="arabic"> |
| <li><p>You need to start QEMU using the nuttx ELF file just create above:</p> |
| <blockquote> |
| <div><div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>qemu-system-arm<span class="w"> </span>-M<span class="w"> </span>lm3s6965evb<span class="w"> </span>-device<span class="w"> </span>loader,file<span class="o">=</span>nuttx<span class="w"> </span>-serial<span class="w"> </span>mon:stdio<span class="w"> </span>-nographic<span class="w"> </span>-s |
| <span class="go">Timer with period zero, disabling</span> |
| <span class="go">ABCDF</span> |
| <span class="go">telnetd [4:100]</span> |
| |
| <span class="go">NuttShell (NSH) NuttX-12.0.0</span> |
| <span class="go">nsh></span> |
| </pre></div> |
| </div> |
| </div></blockquote> |
| </li> |
| </ol> |
| </section> |
| <section id="start-gdb-to-connect-to-qemu"> |
| <h2>Start GDB to connect to QEMU<a class="headerlink" href="#start-gdb-to-connect-to-qemu" title="Permalink to this heading"></a></h2> |
| <blockquote> |
| <div><p>These steps show how to connect GDB to QEMU running NuttX:</p> |
| <blockquote> |
| <div><div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>gdb-multiarch<span class="w"> </span>nuttx<span class="w"> </span>-ex<span class="w"> </span><span class="s2">"source tools/gdb/__init__.py"</span><span class="w"> </span>-ex<span class="w"> </span><span class="s2">"target remote 127.0.0.1:1234"</span> |
| <span class="go"> Type "apropos word" to search for commands related to "word"...</span> |
| <span class="go"> Reading symbols from nuttx...</span> |
| <span class="go"> set pagination off</span> |
| <span class="go"> source tools/gdb/lists.py</span> |
| <span class="go"> source tools/gdb/utils.py</span> |
| <span class="go"> source tools/gdb/memdump.py</span> |
| |
| <span class="go"> if use thread command, please don't use 'continue', use 'c' instead !!!</span> |
| <span class="go"> source tools/gdb/thread.py</span> |
| <span class="go"> "handle SIGUSR1 "nostop" "pass" "noprint"</span> |
| <span class="go"> Remote debugging using 127.0.0.1:1234</span> |
| <span class="go"> 0x0000a45a in up_idle () at chip/common/tiva_idle.c:62</span> |
| <span class="go"> 62 }</span> |
| <span class="gp gp-VirtualEnv">(gdb)</span> |
| </pre></div> |
| </div> |
| </div></blockquote> |
| </div></blockquote> |
| <ol class="arabic"> |
| <li><p>From (gdb) prompt you can run commands to inpect NuttX:</p> |
| <blockquote> |
| <div><div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="go"> (gdb) info threads</span> |
| <span class="go"> Id Thread Info Frame</span> |
| <span class="go"> *0 Thread 0x2000168c (Name: Idle_Task, State: Running, Priority: 0, Stack: 1008) 0xa45a up_idle() at chip/common/tiva_idle.c:62</span> |
| <span class="go"> 1 Thread 0x20005270 (Name: hpwork, State: Waiting,Semaphore, Priority: 224, Stack: 1984) 0xa68c up_switch_context() at common/arm_switchcontext.c:95</span> |
| <span class="go"> 2 Thread 0x20005e30 (Name: nsh_main, State: Waiting,Semaphore, Priority: 100, Stack: 2008) 0xa68c up_switch_context() at common/arm_switchcontext.c:95</span> |
| <span class="go"> 3 Thread 0x20006d48 (Name: NTP_daemon, State: Waiting,Signal, Priority: 100, Stack: 1960) 0xa68c up_switch_context() at common/arm_switchcontext.c:95</span> |
| <span class="go"> 4 Thread 0x20008b60 (Name: telnetd, State: Waiting,Semaphore, Priority: 100, Stack: 2016) 0xa68c up_switch_context() at common/arm_switchcontext.c:95</span> |
| <span class="gp gp-VirtualEnv">(gdb)</span> |
| </pre></div> |
| </div> |
| </div></blockquote> |
| </li> |
| </ol> |
| <p>As you can see QEMU and GDB are powerful tools to debug NuttX without using external board or expensive debugging hardware.</p> |
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