RTEMS | testsuites/validation: The MicroBlaze wrapper reads the interrupt stack (#5727)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5727



The `__wrap_bsp_interrupt_dispatch()` of `tc-score-isr.c` for MicroBlaze reads
the stack pointer register `r1` to obtain the stack of the interrupted context.
`_ISR_Handler` switches to the interrupt stack before it calls the dispatch, so
the register always holds the interrupt stack. The check of `ScoreIsrValIsr`
can never pass and `ts-validation-intr` reports one failed step for it.

The switch to the interrupt stack stores the stack pointer of the interrupted
context at the begin of the frame at the top of the interrupt stack. The
AArch64 wrapper in the same file reads its equivalent for the same reason.

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

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5727
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