[Bug 2082] New: Nested interrupts broken since inclusion of smp changes

[bugzilla-daemon at rtems.org]

https://www.rtems.org/bugzilla/show_bug.cgi?id=2082

             Bug #: 2082
           Summary: Nested interrupts broken since inclusion of smp
                    changes
    Classification: Unclassified
           Product: RTEMS
           Version: HEAD
          Platform: sparc
        OS/Version: RTEMS
            Status: NEW
          Severity: normal
          Priority: P3
         Component: bsps
        AssignedTo: joel.sherrill at oarcorp.com
        ReportedBy: Pierre.Willenbrock at dfki.de


Commit 0bd3f7e5d12fdbfb5bf4aa4a4169c67bfd92c988 changed
c/src/lib/libbsp/sparc/shared/irq_asm.S in a way that allows the current
register window of the interrupted code to be stored in its own stack frame,
instead of in the interrupt stack frame, as expected by simple_return.

To avoid this, interrupts must stay disabled until after the "mov %sp, %fp"
instruction is executed.

That instruction points the %sp of the interrupted code to the ISF, so a window
overflow puts the register contents there(at CPU_STACK_FRAME_*). The correct
%sp of the interrupted code is restored from the ISF_I6_OFFSET of the ISF
during simple_return.

In the non-smp case, simply exchanging the whole stack switch with the code
manipulating the psr works.

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