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| |
| <section id="gdbserver"> |
| <h1>gdbserver<a class="headerlink" href="#gdbserver" title="Permalink to this heading"></a></h1> |
| <section id="introduction"> |
| <h2>Introduction<a class="headerlink" href="#introduction" title="Permalink to this heading"></a></h2> |
| <p>This tool can utilize a crash log on a PC to simulate a set of GDB server functionalities, |
| enabling the use of GDB to debug the context of a NuttX crash. |
| The script directory is located in <code class="docutils literal notranslate"><span class="pre">tools/gdbserver.py</span></code>.</p> |
| </section> |
| <section id="usage"> |
| <h2>Usage<a class="headerlink" href="#usage" title="Permalink to this heading"></a></h2> |
| <p>We can use <code class="docutils literal notranslate"><span class="pre">-h</span></code> to get help information:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>usage:<span class="w"> </span>gdbserver.py<span class="w"> </span><span class="o">[</span>-h<span class="o">]</span><span class="w"> </span>-e<span class="w"> </span>ELFFILE<span class="w"> </span><span class="o">[</span>-l<span class="w"> </span>LOGFILE<span class="o">]</span><span class="w"> </span><span class="o">[</span>-a<span class="w"> </span><span class="o">{</span>arm,arm-a,arm-t,riscv,esp32s3,xtensa<span class="o">}]</span><span class="w"> </span><span class="o">[</span>-p<span class="w"> </span>PORT<span class="o">]</span><span class="w"> </span><span class="o">[</span>-g<span class="w"> </span>GDB<span class="o">]</span><span class="w"> </span><span class="o">[</span>-i<span class="w"> </span><span class="o">[</span>INIT_CMD<span class="o">]]</span> |
| <span class="w"> </span><span class="o">[</span>-r<span class="w"> </span><span class="o">[</span>RAWFILE<span class="w"> </span>...<span class="o">]]</span><span class="w"> </span><span class="o">[</span>-c<span class="w"> </span><span class="o">[</span>COREDUMP<span class="o">]]</span><span class="w"> </span><span class="o">[</span>--debug<span class="o">]</span> |
| |
| <span class="w"> </span>options: |
| <span class="w"> </span>-h,<span class="w"> </span>--help<span class="w"> </span>show<span class="w"> </span>this<span class="w"> </span><span class="nb">help</span><span class="w"> </span>message<span class="w"> </span>and<span class="w"> </span><span class="nb">exit</span> |
| <span class="w"> </span>-e<span class="w"> </span>ELFFILE,<span class="w"> </span>--elffile<span class="w"> </span>ELFFILE |
| <span class="w"> </span>elffile |
| <span class="w"> </span>-l<span class="w"> </span>LOGFILE,<span class="w"> </span>--logfile<span class="w"> </span>LOGFILE |
| <span class="w"> </span>logfile |
| <span class="w"> </span>-a<span class="w"> </span><span class="o">{</span>arm,arm-a,arm-t,riscv,esp32s3,xtensa<span class="o">}</span>,<span class="w"> </span>--arch<span class="w"> </span><span class="o">{</span>arm,arm-a,arm-t,riscv,esp32s3,xtensa<span class="o">}</span> |
| <span class="w"> </span>Only<span class="w"> </span>use<span class="w"> </span><span class="k">if</span><span class="w"> </span>can<span class="s1">'t be learnt from ELFFILE.</span> |
| <span class="s1"> -p PORT, --port PORT gdbport</span> |
| <span class="s1"> -g GDB, --gdb GDB provided a custom GDB path, automatically start GDB session and exit gdbserver when exit GDB.</span> |
| <span class="s1"> -i [INIT_CMD], --init-cmd [INIT_CMD]</span> |
| <span class="s1"> provided a custom GDB init command, automatically start GDB sessions and input what you provide. if you don'</span>t |
| <span class="w"> </span>provide<span class="w"> </span>any<span class="w"> </span>command,<span class="w"> </span>it<span class="w"> </span>will<span class="w"> </span>use<span class="w"> </span>default<span class="w"> </span><span class="nb">command</span><span class="w"> </span><span class="o">[</span>-ex<span class="w"> </span><span class="s1">'bt full'</span><span class="w"> </span>-ex<span class="w"> </span><span class="s1">'info reg'</span><span class="w"> </span>-ex<span class="w"> </span><span class="s1">'display /40i $pc-40'</span><span class="o">]</span>. |
| <span class="w"> </span>-r<span class="w"> </span><span class="o">[</span>RAWFILE<span class="w"> </span>...<span class="o">]</span>,<span class="w"> </span>--rawfile<span class="w"> </span><span class="o">[</span>RAWFILE<span class="w"> </span>...<span class="o">]</span> |
| <span class="w"> </span>rawfile<span class="w"> </span>is<span class="w"> </span>a<span class="w"> </span>binary<span class="w"> </span>file,<span class="w"> </span>args<span class="w"> </span>format<span class="w"> </span>like<span class="w"> </span>ram.bin:0x10000<span class="w"> </span>... |
| <span class="w"> </span>-c<span class="w"> </span><span class="o">[</span>COREDUMP<span class="o">]</span>,<span class="w"> </span>--coredump<span class="w"> </span><span class="o">[</span>COREDUMP<span class="o">]</span> |
| <span class="w"> </span>coredump<span class="w"> </span>file,<span class="w"> </span>will<span class="w"> </span>prase<span class="w"> </span>memory<span class="w"> </span><span class="k">in</span><span class="w"> </span>this<span class="w"> </span>file |
| <span class="w"> </span>--debug<span class="w"> </span><span class="k">if</span><span class="w"> </span>enabled,<span class="w"> </span>it<span class="w"> </span>will<span class="w"> </span>show<span class="w"> </span>more<span class="w"> </span>logs. |
| </pre></div> |
| </div> |
| </section> |
| <section id="log-example"> |
| <h2>Log Example<a class="headerlink" href="#log-example" title="Permalink to this heading"></a></h2> |
| <ol class="arabic simple"> |
| <li><p>Use ./tools/configure.sh esp32s3-devkit:nsh and disable <cite>CONFIG_NSH_DISABLE_MW</cite>.</p></li> |
| <li><p><cite>make -j</cite></p></li> |
| <li><p>Flash image to esp32s3-devkit.</p></li> |
| <li><p>Run <cite>minicom -D /dev/ttyUSB0 -b 115200</cite> and reset esp32s3-devkit.</p></li> |
| <li><p>Use <cite>mw -1</cite> on nsh to trigger a crash.</p></li> |
| <li><p>Get the crash log from minicom and save it to <cite>crash.log</cite>.</p></li> |
| </ol> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>up_dump_register:<span class="w"> </span>PC:<span class="w"> </span>42009cd8<span class="w"> </span>PS:<span class="w"> </span><span class="m">00060820</span> |
| up_dump_register:<span class="w"> </span>A0:<span class="w"> </span>82007d71<span class="w"> </span>A1:<span class="w"> </span>3fc8b6d0<span class="w"> </span>A2:<span class="w"> </span>3fc8b8e0<span class="w"> </span>A3:<span class="w"> </span><span class="m">00000000</span> |
| up_dump_register:<span class="w"> </span>A4:<span class="w"> </span>ffffffff<span class="w"> </span>A5:<span class="w"> </span><span class="m">00000000</span><span class="w"> </span>A6:<span class="w"> </span><span class="m">00000001</span><span class="w"> </span>A7:<span class="w"> </span><span class="m">00000000</span> |
| up_dump_register:<span class="w"> </span>A8:<span class="w"> </span>ffffffff<span class="w"> </span>A9:<span class="w"> </span>3fc8b690<span class="w"> </span>A10:<span class="w"> </span>ffffffff<span class="w"> </span>A11:<span class="w"> </span><span class="m">00000000</span> |
| up_dump_register:<span class="w"> </span>A12:<span class="w"> </span>0000002d<span class="w"> </span>A13:<span class="w"> </span>0000002d<span class="w"> </span>A14:<span class="w"> </span>3fc8bb6d<span class="w"> </span>A15:<span class="w"> </span>0fffffff |
| up_dump_register:<span class="w"> </span>SAR:<span class="w"> </span><span class="m">00000000</span><span class="w"> </span>CAUSE:<span class="w"> </span>0000001c<span class="w"> </span>VADDR:<span class="w"> </span>ffffffff |
| up_dump_register:<span class="w"> </span>LBEG:<span class="w"> </span><span class="m">40055499</span><span class="w"> </span>LEND:<span class="w"> </span>400554a9<span class="w"> </span>LCNT:<span class="w"> </span>fffffffc |
| dump_stack:<span class="w"> </span>User<span class="w"> </span>Stack: |
| dump_stack:<span class="w"> </span>base:<span class="w"> </span>0x3fc8b0e0 |
| dump_stack:<span class="w"> </span>size:<span class="w"> </span><span class="m">00002000</span> |
| dump_stack:<span class="w"> </span>sp:<span class="w"> </span>0x3fc8b6d0 |
| stack_dump:<span class="w"> </span>0x3fc8b6c0:<span class="w"> </span><span class="m">82007770</span><span class="w"> </span>3fc8b700<span class="w"> </span>3fc8b8e0<span class="w"> </span><span class="m">00000002</span><span class="w"> </span>ffffffff<span class="w"> </span>3fc89f54<span class="w"> </span>00060e20<span class="w"> </span><span class="m">00000000</span> |
| stack_dump:<span class="w"> </span>0x3fc8b6e0:<span class="w"> </span>3fc8b8e0<span class="w"> </span>3fc8b778<span class="w"> </span><span class="m">00000000</span><span class="w"> </span>3fc8b750<span class="w"> </span><span class="m">82007850</span><span class="w"> </span>3fc8b720<span class="w"> </span>3fc8b8e0<span class="w"> </span><span class="m">00000002</span> |
| stack_dump:<span class="w"> </span>0x3fc8b700:<span class="w"> </span>3fc8b720<span class="w"> </span>42009c84<span class="w"> </span>3fc8bb68<span class="w"> </span>3fc8b8e0<span class="w"> </span>82006b04<span class="w"> </span>3fc8b7d0<span class="w"> </span>3fc8b8e0<span class="w"> </span>3fc8bb68 |
| stack_dump:<span class="w"> </span>0x3fc8b720:<span class="w"> </span>3fc8bb68<span class="w"> </span>3fc8bb6b<span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span> |
| stack_dump:<span class="w"> </span>0x3fc8b740:<span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span> |
| stack_dump:<span class="w"> </span>0x3fc8b760:<span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span>3fc8bb69 |
| stack_dump:<span class="w"> </span>0x3fc8b780:<span class="w"> </span>82006ad5<span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000040</span><span class="w"> </span><span class="m">00000040</span><span class="w"> </span>3fc8bb6e<span class="w"> </span>3fc8adf8<span class="w"> </span>0000002c |
| stack_dump:<span class="w"> </span>0x3fc8b7a0:<span class="w"> </span>ffffffff<span class="w"> </span><span class="m">00000005</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span>3fc8bae0<span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span> |
| stack_dump:<span class="w"> </span>0x3fc8b7c0:<span class="w"> </span>820068a2<span class="w"> </span>3fc8b800<span class="w"> </span>3fc8b8e0<span class="w"> </span>3c020837<span class="w"> </span><span class="m">00000001</span><span class="w"> </span>3fc8b800<span class="w"> </span>3fc8b8e0<span class="w"> </span>3c020837 |
| stack_dump:<span class="w"> </span>0x3fc8b7e0:<span class="w"> </span>0000000a<span class="w"> </span>3fc8bae0<span class="w"> </span><span class="m">00000001</span><span class="w"> </span>3fc8bb68<span class="w"> </span><span class="m">82006865</span><span class="w"> </span>3fc8b820<span class="w"> </span><span class="m">00000001</span><span class="w"> </span>3fc8b0c0 |
| stack_dump:<span class="w"> </span>0x3fc8b800:<span class="w"> </span><span class="m">00000001</span><span class="w"> </span>3fc8bb68<span class="w"> </span><span class="m">00000000</span><span class="w"> </span>3fc8ae1c<span class="w"> </span><span class="m">82003618</span><span class="w"> </span>3fc8b840<span class="w"> </span><span class="m">00000001</span><span class="w"> </span>3fc8b0c0 |
| stack_dump:<span class="w"> </span>0x3fc8b820:<span class="w"> </span>3fc8b8e0<span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span>820019dc<span class="w"> </span>3fc8b870<span class="w"> </span><span class="m">42006834</span><span class="w"> </span><span class="m">00000001</span> |
| stack_dump:<span class="w"> </span>0x3fc8b840:<span class="w"> </span><span class="m">00000064</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span>3c0225d8<span class="w"> </span>3fc89590<span class="w"> </span><span class="m">00000000</span><span class="w"> </span>3fc880cc |
| stack_dump:<span class="w"> </span>0x3fc8b860:<span class="w"> </span><span class="m">00000000</span><span class="w"> </span>3fc8b890<span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span>3fc8b0c0<span class="w"> </span><span class="m">00000002</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span>3fc8ad98 |
| stack_dump:<span class="w"> </span>0x3fc8b880:<span class="w"> </span><span class="m">00000000</span><span class="w"> </span>3fc8b8b0<span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span><span class="w"> </span><span class="m">00000000</span> |
| </pre></div> |
| </div> |
| <ol class="arabic simple" start="7"> |
| <li><p>Run <cite>./tools/gdbserver.py -e nuttx -l crash.log -p 1234 -a esp32s3</cite></p></li> |
| <li><p>Run <cite>xtensa-esp32s3-elf-gdb nuttx -ex “target remote 127.0.0.1:1234”</cite></p></li> |
| </ol> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>GNU<span class="w"> </span>gdb<span class="w"> </span><span class="o">(</span>esp-gdb<span class="o">)</span><span class="w"> </span><span class="m">12</span>.1_20221002 |
| Copyright<span class="w"> </span><span class="o">(</span>C<span class="o">)</span><span class="w"> </span><span class="m">2022</span><span class="w"> </span>Free<span class="w"> </span>Software<span class="w"> </span>Foundation,<span class="w"> </span>Inc. |
| License<span class="w"> </span>GPLv3+:<span class="w"> </span>GNU<span class="w"> </span>GPL<span class="w"> </span>version<span class="w"> </span><span class="m">3</span><span class="w"> </span>or<span class="w"> </span>later<span class="w"> </span><http://gnu.org/licenses/gpl.html> |
| This<span class="w"> </span>is<span class="w"> </span>free<span class="w"> </span>software:<span class="w"> </span>you<span class="w"> </span>are<span class="w"> </span>free<span class="w"> </span>to<span class="w"> </span>change<span class="w"> </span>and<span class="w"> </span>redistribute<span class="w"> </span>it. |
| There<span class="w"> </span>is<span class="w"> </span>NO<span class="w"> </span>WARRANTY,<span class="w"> </span>to<span class="w"> </span>the<span class="w"> </span>extent<span class="w"> </span>permitted<span class="w"> </span>by<span class="w"> </span>law. |
| Type<span class="w"> </span><span class="s2">"show copying"</span><span class="w"> </span>and<span class="w"> </span><span class="s2">"show warranty"</span><span class="w"> </span><span class="k">for</span><span class="w"> </span>details. |
| This<span class="w"> </span>GDB<span class="w"> </span>was<span class="w"> </span>configured<span class="w"> </span>as<span class="w"> </span><span class="s2">"--host=x86_64-linux-gnu --target=xtensa-esp-elf"</span>. |
| Type<span class="w"> </span><span class="s2">"show configuration"</span><span class="w"> </span><span class="k">for</span><span class="w"> </span>configuration<span class="w"> </span>details. |
| For<span class="w"> </span>bug<span class="w"> </span>reporting<span class="w"> </span>instructions,<span class="w"> </span>please<span class="w"> </span>see: |
| <https://www.gnu.org/software/gdb/bugs/>. |
| Find<span class="w"> </span>the<span class="w"> </span>GDB<span class="w"> </span>manual<span class="w"> </span>and<span class="w"> </span>other<span class="w"> </span>documentation<span class="w"> </span>resources<span class="w"> </span>online<span class="w"> </span>at: |
| <span class="w"> </span><http://www.gnu.org/software/gdb/documentation/>. |
| |
| For<span class="w"> </span>help,<span class="w"> </span><span class="nb">type</span><span class="w"> </span><span class="s2">"help"</span>. |
| Type<span class="w"> </span><span class="s2">"apropos word"</span><span class="w"> </span>to<span class="w"> </span>search<span class="w"> </span><span class="k">for</span><span class="w"> </span>commands<span class="w"> </span>related<span class="w"> </span>to<span class="w"> </span><span class="s2">"word"</span>... |
| Reading<span class="w"> </span>symbols<span class="w"> </span>from<span class="w"> </span>nuttx... |
| Remote<span class="w"> </span>debugging<span class="w"> </span>using<span class="w"> </span><span class="m">127</span>.0.0.1:1234 |
| 0x42009cd8<span class="w"> </span><span class="k">in</span><span class="w"> </span>cmd_mw<span class="w"> </span><span class="o">(</span><span class="nv">vtbl</span><span class="o">=</span>0x3fc8b8e0,<span class="w"> </span><span class="nv">argc</span><span class="o">=</span><optimized<span class="w"> </span>out>,<span class="w"> </span><span class="nv">argv</span><span class="o">=</span><optimized<span class="w"> </span>out><span class="o">)</span><span class="w"> </span>at<span class="w"> </span>nsh_dbgcmds.c:259 |
| <span class="m">259</span><span class="w"> </span>nsh_output<span class="o">(</span>vtbl,<span class="w"> </span><span class="s2">" %p = 0x%08"</span><span class="w"> </span>PRIx32,<span class="w"> </span>ptr,<span class="w"> </span>*ptr<span class="o">)</span><span class="p">;</span> |
| <span class="o">(</span>gdb<span class="o">)</span><span class="w"> </span>bt |
| <span class="c1">#0 0x42009cd8 in cmd_mw (vtbl=0x3fc8b8e0, argc=<optimized out>, argv=<optimized out>) at nsh_dbgcmds.c:259</span> |
| <span class="c1">#1 0x42007d71 in nsh_command (vtbl=0x3fc8b8e0, argc=2, argv=0x3fc8b720) at nsh_command.c:1154</span> |
| <span class="c1">#2 0x42007770 in nsh_execute (oflags=<optimized out>, redirfile=0x0, argv=0x3fc8b720, argc=2, vtbl=0x3fc8b8e0)</span> |
| <span class="w"> </span>at<span class="w"> </span>nsh_parse.c:845 |
| <span class="c1">#3 nsh_parse_command (vtbl=0x3fc8b8e0, cmdline=<optimized out>) at nsh_parse.c:2744</span> |
| <span class="c1">#4 0x42007850 in nsh_parse (vtbl=0x3fc8b8e0,</span> |
| <span class="w"> </span><span class="nv">cmdline</span><span class="o">=</span>0x3fc8bb68<span class="w"> </span><error:<span class="w"> </span>Cannot<span class="w"> </span>access<span class="w"> </span>memory<span class="w"> </span>at<span class="w"> </span>address<span class="w"> </span>0x3fc8bb68><span class="o">)</span><span class="w"> </span>at<span class="w"> </span>nsh_parse.c:2828 |
| <span class="c1">#5 0x42006b04 in nsh_session (pstate=0x3fc8b8e0, login=<optimized out>, argc=1, argv=<optimized out>)</span> |
| <span class="w"> </span>at<span class="w"> </span>nsh_session.c:245 |
| <span class="c1">#6 0x420068a2 in nsh_consolemain (argc=1, argv=0x3fc8b0c0) at nsh_consolemain.c:71</span> |
| <span class="c1">#7 0x42006865 in nsh_main (argc=1, argv=0x3fc8b0c0) at nsh_main.c:74</span> |
| <span class="c1">#8 0x42003618 in nxtask_startup (entrypt=0x42006834 <nsh_main>, argc=1, argv=0x3fc8b0c0)</span> |
| <span class="w"> </span>at<span class="w"> </span>sched/task_startup.c:70 |
| <span class="c1">#9 0x420019dc in nxtask_start () at task/task_start.c:134</span> |
| <span class="o">(</span>gdb<span class="o">)</span> |
| </pre></div> |
| </div> |
| </section> |
| <section id="raw-file-example"> |
| <h2>Raw file Example<a class="headerlink" href="#raw-file-example" title="Permalink to this heading"></a></h2> |
| <ol class="arabic simple"> |
| <li><p>If you obtain the memory file from your board, you can also use gdbserver.py to reconstruct the scene. |
| The most common way to get the raw file is to use the dump memory command |
| in GDB to dump the memory and save it as a file.</p></li> |
| <li><p>Run <cite>./tools/gdbserver.py -e nuttx -r rawfile:0x1000 -a arm</cite></p></li> |
| <li><p>Run gdb with target remote.</p></li> |
| </ol> |
| </section> |
| <section id="coredump-example"> |
| <h2>Coredump Example<a class="headerlink" href="#coredump-example" title="Permalink to this heading"></a></h2> |
| <ol class="arabic simple"> |
| <li><p>If you have a coredump, you also can run <cite>./tools/gdbserver.py -e nuttx -c coredump -a arm</cite></p></li> |
| <li><p>Run gdb with target remote.</p></li> |
| </ol> |
| <p>The benefit of this approach is that in a multi-core AMP system, |
| a single coredump might contain memory information from other cores. |
| By analyzing this coredump along with the corresponding ELF files from |
| the other cores, you can reconstruct the crash site of those other cores.</p> |
| </section> |
| <section id="thread-awarenes"> |
| <h2>Thread awarenes<a class="headerlink" href="#thread-awarenes" title="Permalink to this heading"></a></h2> |
| <p><cite>gdbserver.py</cite> implements thread debugging based on <cite>g_pidhash</cite>, <cite>g_npidhash</cite>, |
| and <cite>g_tcbinfo</cite> in NuttX. If the log, raw file, or coredump you provide can read these variables, |
| it means you can use thread-related commands in GDB, such as <cite>info thread</cite> or <cite>thread</cite></p> |
| </section> |
| <section id="how-to-add-new-architecture"> |
| <h2>How to add new architecture<a class="headerlink" href="#how-to-add-new-architecture" title="Permalink to this heading"></a></h2> |
| <p>The main objective is to establish the sequence of registers in GDB, |
| aligning the register names in the crash log with the order of registers in GDB. |
| This alignment will facilitate the creation of a new architecture’s GDB server.</p> |
| </section> |
| </section> |
| |
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