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<a href="https://gitlab.rtems.org/sebhub">Sebastian Huber</a> created a merge request: <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1561">!1561</a>
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Project:Branches: sebhub/rtems:up/elf-notes to rtems/rtos/rtems:main
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Author: Sebastian Huber
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<h2 id="user-content-summary" dir="auto" style="margin-top: 0px; margin-bottom: 10px;" align="initial">Summary<a href="#summary" aria-label="Link to heading 'Summary'" data-heading-content="Summary" class="anchor" style="margin-top: 0px;"></a>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">Issue <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/4888" title="Add support for ELF notes" class="gfm gfm-issue" data-original="#4888" data-link="false" data-link-reference="false" data-issue="27479" data-project="26" data-iid="4888" data-namespace-path="rtems/rtos/rtems" data-project-path="rtems/rtos/rtems" data-issue-type="issue" data-container="body" data-placement="top" data-reference-type="issue" style="margin-top: 0px;">#4888</a>: Add support for ELF notes</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial"><strong style="font-weight: 600; margin-top: 0px;">Problem:</strong> An executable carries no build data which a tool can read without running it. The test programs and the verbose fatal extension print the version and the build label, so each new commit changes the loaded image of every executable.</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial"><strong style="font-weight: 600; margin-top: 0px;">Fix:</strong> The start file of each BSP emits a <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">.note.rtems</code> section with the version, the build options, the tools, the BSP and the build label. Each test program emits its test state as a note. The linker command files place the section unallocated, so the notes stay out of the loaded image. The test support and the fatal extension no longer print this information.</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial"><strong style="font-weight: 600; margin-top: 0px;">Review hints:</strong></p>
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<li style="margin-top: 0px; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">
<code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;"><rtems/elfnotes.h></code> defines the note format. <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;"><rtems/score/elfnotesbuild.h></code> holds the assembler macro of the start files.</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">The first commit is an independent fix of the tick conversion check of <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;">libtests/ttest01</code>.</li>
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<h2 id="user-content-test" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Test<a href="#test" aria-label="Link to heading 'Test'" data-heading-content="Test" class="anchor" style="margin-top: 0px;"></a>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial"><code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">readelf -n</code> lists the six notes in <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">hello.exe</code> of <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">riscv/rv64imafdc</code>. The same commits run through the simulator test suites of 13 architectures in the embedded brains CI.</p>
<h2 id="user-content-ai-details" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">AI Details<a href="#ai-details" aria-label="Link to heading 'AI Details'" data-heading-content="AI Details" class="anchor" style="margin-top: 0px;"></a>
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<h3 id="user-content-prompt-used" dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; font-weight: 600; font-size: 1.125rem; letter-spacing: inherit; line-height: 1.25; color: #18171d;" align="initial">Prompt used<a href="#prompt-used" aria-label="Link to heading 'Prompt used'" data-heading-content="Prompt used" class="anchor" style="margin-top: 0px;"></a>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">None as a single prompt. The work was done in an interactive Claude Code session on the RTEMS tree. Each change was directed and reviewed.</p>
<h3 id="user-content-ai-model-used" dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; font-weight: 600; font-size: 1.125rem; letter-spacing: inherit; line-height: 1.25; color: #18171d;" align="initial">AI model used<a href="#ai-model-used" aria-label="Link to heading 'AI model used'" data-heading-content="AI model used" class="anchor" style="margin-top: 0px;"></a>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">Claude Opus 5.5 (claude-opus-5-5), through Claude Code.</p>
<h3 id="user-content-how-ai-was-used-for-the-contribution" dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; font-weight: 600; font-size: 1.125rem; letter-spacing: inherit; line-height: 1.25; color: #18171d;" align="initial">How AI was used for the contribution<a href="#how-ai-was-used-for-the-contribution" aria-label="Link to heading 'How AI was used for the contribution'" data-heading-content="How AI was used for the contribution" class="anchor" style="margin-top: 0px;"></a>
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<ul dir="auto" style="text-align: initial; list-style-type: disc; margin: 0px 0px 1rem; padding: 0;">
<li style="margin-top: 0px; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">( ) Formatting</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">( ) Test creation.</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">(x) Code comments.</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">( ) The entire contribution was generated using AI</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">( ) AI code completion such as Copilot in VSCode.</li>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">The implementation was produced in that session under my direction, and the commit messages were drafted there.</p>
<h3 id="user-content-access" dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; font-weight: 600; font-size: 1.125rem; letter-spacing: inherit; line-height: 1.25; color: #18171d;" align="initial">Access<a href="#access" aria-label="Link to heading 'Access'" data-heading-content="Access" class="anchor" style="margin-top: 0px;"></a>
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<p dir="auto" style="color: #3a383f; margin: 0px;" align="initial">I have not used a product which claims copyright in its output, and I have legitimate access to the one I used.</p>
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