Sam Price created a merge request: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/845

Project:Branches: TheSamPrice/rtems:feature/microblaze-irq-handler to 
rtems/rtos/rtems:main
Author:   Sam Price




## Summary

This could use some very careful review.

We have been running with the following

```
        /* Subtract stack frame */
        addik r1, r1, -(CPU_INTERRUPT_FRAME_SIZE)

        swi r5, r1, 8

        /* Indicate unknown interrupt source */
        /* GSFC: Switch addi -> addik to not corrupt msr. */
        addik r5, r0, 0xFF

        braid _ISR_Handler

```

Going to follow up with some more comments on this one.

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https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/845
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