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<p style="color: #777777;">
<a href="https://gitlab.rtems.org/the.m3chanic">Suraj Kumar</a>
<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5035#note_108138">commented</a>:
</p>
<div class="md" style="color: #333238; word-wrap: break-word;">
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Using C to generate the object code for us seems to be the best way to go forward with this, to let us not worry about architecture specifics.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Currently, the idea is to add the code snippet containing the Python code to a C file which is universally accessed by the linker for all links. A starting point is: <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/main/cpukit/sapi/src/exinit.c" style="margin-top: 0;">https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/main/cpukit/sapi/src/exinit.c</a></p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">The following modifications can be made to the file to reflect the desired changes:</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">
<p style="color: #333238; margin: 0 0 16px;">Add macro definition</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre data-canonical-lang="c" class="code highlight js-syntax-highlight language-c" v-pre="true" style='display: block; font-size: 14px; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="c" style="margin-top: 0;"><span class="cp" style="margin-top: 0;">#define DEFINE_GDB_PY() \</span></span>
<span id="LC2" class="line" lang="c"><span class="cp" style="margin-top: 0;"> asm( \</span></span>
<span id="LC3" class="line" lang="c"><span class="cp" style="margin-top: 0;"> ".pushsection \".debug_gdb_scripts\", \"MS\",@progbits,1\n" \</span></span>
<span id="LC4" class="line" lang="c"><span class="cp" style="margin-top: 0;"> ".byte 4\n" \</span></span>
<span id="LC5" class="line" lang="c"><span class="cp" style="margin-top: 0;"> ".ascii \"gdb.inlined-script\\n\"\n" \</span></span>
<span id="LC6" class="line" lang="c"><span class="cp" style="margin-top: 0;"> ".ascii \"import sys\\n\"\n" \</span></span>
<span id="LC7" class="line" lang="c"><span class="cp" style="margin-top: 0;"> ".ascii \"import os.path\\n\"\n" \</span></span>
<span id="LC8" class="line" lang="c"><span class="cp" style="margin-top: 0;"> ".ascii \"sys.path.append(os.path.join(gdb.PYTHONDIR, 'rtems'))\\n\"\n" \</span></span>
<span id="LC9" class="line" lang="c"><span class="cp" style="margin-top: 0;"> ".ascii \"print(sys.path)\\n\"\n" \</span></span>
<span id="LC10" class="line" lang="c"><span class="cp" style="margin-top: 0;"> ".ascii \"print(gdb.PYTHONDIR)\\n\"\n" \</span></span>
<span id="LC11" class="line" lang="c"><span class="cp" style="margin-top: 0;"> ".ascii \"import rtems.stdcxx as stdcxx\\n\"\n" \</span></span>
<span id="LC12" class="line" lang="c"><span class="cp" style="margin-top: 0;"> ".byte 0\n" \</span></span>
<span id="LC13" class="line" lang="c"><span class="cp" style="margin-top: 0;"> ".popsection\n" \</span></span>
<span id="LC14" class="line" lang="c"><span class="cp" style="margin-top: 0;"> )</span></span></code></pre>
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</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">
<p style="color: #333238; margin: 0 0 16px;">Add macro call in function <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>rtems_initialize_data_structures()</code></p>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">After these modifications, build the BSP again and build this application</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre data-canonical-lang="cpp" class="code highlight js-syntax-highlight language-cpp" v-pre="true" style='display: block; font-size: 14px; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="cpp" style="margin-top: 0;"><span class="kt" style="margin-top: 0;">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span></span>
<span id="LC2" class="line" lang="cpp"> <span class="n" style="margin-top: 0;">DEFINE_GDB_PY</span><span class="p">();</span></span>
<span id="LC3" class="line" lang="cpp"> <span class="n" style="margin-top: 0;">std</span><span class="o">::</span><span class="n">cout</span> <span class="o"><<</span> <span class="s">"Hello World"</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span></span>
<span id="LC4" class="line" lang="cpp"></span>
<span id="LC5" class="line" lang="cpp"> <span class="k" style="margin-top: 0;">auto</span> <span class="n">v</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="p">({</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="mi">8</span><span class="p">});</span></span>
<span id="LC6" class="line" lang="cpp"> <span class="k" style="margin-top: 0;">for</span> <span class="p">(</span><span class="k">auto</span> <span class="n">i</span><span class="o">:</span> <span class="n">v</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC7" class="line" lang="cpp"> <span class="n" style="margin-top: 0;">std</span><span class="o">::</span><span class="n">cout</span> <span class="o"><<</span> <span class="n">i</span> <span class="o"><<</span> <span class="sc">' '</span><span class="p">;</span></span>
<span id="LC8" class="line" lang="cpp"> <span class="p" style="margin-top: 0;">}</span></span>
<span id="LC9" class="line" lang="cpp"> <span class="n" style="margin-top: 0;">std</span><span class="o">::</span><span class="n">cout</span> <span class="o"><<</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span></span>
<span id="LC10" class="line" lang="cpp"></span>
<span id="LC11" class="line" lang="cpp"> <span class="k" style="margin-top: 0;">return</span> <span class="mi">0</span><span class="p">;</span></span>
<span id="LC12" class="line" lang="cpp"><span class="p" style="margin-top: 0;">}</span></span></code></pre>
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</div>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">After that, running this command shows us the existence of <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>.unexpected_sections</code> (which exists because we didn't tell the linker about the custom section).</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">arm-rtems6-readelf -S <path_to_exe></span></code></pre>
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</div>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">We can dump the section with</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;"> arm-rtems6-objdump -s -j .unexpected_sections <path_to_exe></span></code></pre>
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</div>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">to verify the existence of said script.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">To make the section show up as a valid section to test in GDB, add this line to <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>linkcmds.base</code> present in <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-weight: inherit; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>{prefix}/rtems/6/arm-rtems6/xilinx_zynq_a9_qemu/lib/linkcmds.base</code>:</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">.debug_gdb_scripts 0 : { *(.debug_gdb_scripts) }</span></code></pre>
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</div>
<p dir="auto" style="color: #333238; margin: 0;" align="initial">And rebuild the file</p>
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