RTEMS | testsuites/validation: Fix the MicroBlaze stack (!1452)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion on testsuites/validation/tc-score-isr.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1452#note_158200

 > -  register uintptr_t sp __asm__( "1" );
 > -
 >    if ( interrupted_stack_at_multitasking_start == 0 ) {
 > -    interrupted_stack_at_multitasking_start = sp;
 > +    const Per_CPU_Control *cpu_self;
 > +    const uintptr_t       *frame;
 > +
 > +    /*
 > +     * The dispatch runs on the interrupt stack.  The switch to that stack
 > +     * stores the stack pointer of the interrupted context at the begin of the
 > +     * frame at the top of the interrupt stack.
 > +     */
 > +    cpu_self = _Per_CPU_Get();
 > +    frame = (const uintptr_t *) ( (uintptr_t) cpu_self->interrupt_stack_high -
 > +      CPU_INTERRUPT_FRAME_SIZE );
 > +    interrupted_stack_at_multitasking_start = *frame;

This code is technically correct, but I would much prefer if it used `CPU_Exception_frame` to access r1, instead.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1452#note_158200
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