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powerpc64: Add extra SPRs on fatal traps
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Authored by breno.leitao_gmail.com on May 4 2018, 1:09 AM.
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Summary

This patch simply prints two additional registers on a fatal trap. These
registers help to identify the cause of the trap. They are:

DSISR: Data Storage Interrupt Status Register
DAR: Data Address Register

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Buildable 16419
Build 16340: arc lint + arc unit