RTEMS | cpukit/score/cpu/or1k: The exception vector table and the context validation (#5686)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5686



Three defects of the port and its link scripts.

The link script does not keep the exception vector table, so `--gc-sections`
removes it and the processor takes its vectors from whatever follows.

`_CPU_Instruction_illegal()` emits a `.word 0`, which is `l.j 0` on this
architecture and branches to itself, so `spfatal26` hangs rather than taking the
illegal instruction exception.

`_CPU_Context_validate()` and `_CPU_Context_volatile_clobber()` do not cover the
registers which the context switch and the interrupt processing save and
restore, so `spcontext01` cannot detect a defect in either.

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

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5686
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