RTEMS | cpukit/score/cpu/mips: The port has no thread-local storage (#5689)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5689



The port implements no thread-local storage. The MIPS ABI reads the thread
pointer with the `rdhwr` instruction from hardware register 29, which the
processor of the `jmr3904` BSP does not implement, so the access takes a
reserved instruction exception.

Found while running the full test suite on the GDB simulator. This description
was created with Claude Code assistance.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5689
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