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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>-ix<span class="w"> </span>tools/nuttx-gdbinit<span class="w"> </span>nuttx |
| <span class="gp gp-VirtualEnv">(gdb)</span> <span class="go">target extended-remote localhost:1234</span> |
| <span class="go">Remote debugging using localhost:1234</span> |
| <span class="go">0x000012ee in up_mdelay (milliseconds=milliseconds@entry=250)</span> |
| <span class="go"> at common/arm_mdelay.c:51</span> |
| <span class="go">51 for (j = 0; j < CONFIG_BOARD_LOOPSPERMSEC; j++)</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="gp gp-VirtualEnv">(gdb)</span> <span class="go">info_nxthreads</span> |
| <span class="go">target examined</span> |
| <span class="go">_target_arch.name=armv7</span> |
| <span class="gp">$</span>_target_has_fpu<span class="w"> </span>:<span class="w"> </span><span class="m">1</span> |
| <span class="gp">$</span>_target_has_smp<span class="w"> </span>:<span class="w"> </span><span class="m">0</span> |
| <span class="go">saved current_tcb (pid=0)</span> |
| <span class="go">*</span> |
| <span class="go">0 Thread 0x20001538 (Name: Idle Task, State: Running, Priority: 0, Stack: 464/1000) PC: 0x12fc in up_mdelay()</span> |
| <span class="go">saved current_tcb (pid=0)</span> |
| |
| <span class="go">1 Thread 0x20005060 (Name: hpwork, State: Waiting,Semaphore, Priority: 224, Stack: 320/1992) PC: 0x47dd in work_thread()</span> |
| <span class="go">saved current_tcb (pid=0)</span> |
| |
| <span class="go">2 Thread 0x20005c30 (Name: nsh_main, State: Waiting,Semaphore, Priority: 100, Stack: 1016/2000) PC: 0x1 in _vectors()</span> |
| <span class="go">saved current_tcb (pid=0)</span> |
| |
| <span class="go">3 Thread 0x20006b40 (Name: NTP daemon, State: Waiting,Signal, Priority: 100, Stack: 864/1952) PC: 0x0 in _vectors()</span> |
| <span class="go">saved current_tcb (pid=0)</span> |
| |
| <span class="go">4 Thread 0x20008540 (Name: telnetd, State: Waiting,Semaphore, Priority: 100, Stack: 616/2008) PC: 0x20008fd4 in No()</span> |
| <span class="go">saved current_tcb (pid=0)</span> |
| <span class="go">saved current_tcb (pid=0)</span> |
| <span class="go">saved current_tcb (pid=0)</span> |
| <span class="go">saved current_tcb (pid=0)</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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