tree a7c3b41dc06504c87a7f952d2232a567b43fda5f
parent 5b63fee1fe5d10c397d740ffef4d576a196ed72d
author Anton Blanchard <anton@samba.org> 1375804879 +1000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1376445020 +1000

powerpc: Handle unaligned ldbrx/stdbrx

Normally when we haven't implemented an alignment handler for
a load or store instruction the process will be terminated.

The alignment handler uses the DSISR (or a pseudo one) to locate
the right handler. Unfortunately ldbrx and stdbrx overlap lfs and
stfs so we incorrectly think ldbrx is an lfs and stdbrx is an
stfs.

This bug is particularly nasty - instead of terminating the
process we apply an incorrect fixup and continue on.

With more and more overlapping instructions we should stop
creating a pseudo DSISR and index using the instruction directly,
but for now add a special case to catch ldbrx/stdbrx.

Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>