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Issue created by <a href="https://gitlab.rtems.org/sebhub">Sebastian Huber</a>: <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5695">#5695</a>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">The thread pointer of the i386 ABI lives in the GS segment descriptor, which the
context switch does not save, so every thread uses the descriptor of the thread
which ran before it. <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;">_CPU_Get_TLS_thread_pointer()</code> also assembles the base
address of the descriptor from the wrong fields.</p>
<p dir="auto" style="color: #3a383f; margin: 0px;" align="initial">Found while running the full test suite on Qemu. This description was created
with Claude Code assistance.</p>
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