powerpc: Unaligned stores and stmw are broken in emulation code
authorTom Musta <tmusta@us.ibm.com>
Thu, 22 Aug 2013 14:25:28 +0000 (09:25 -0500)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Tue, 27 Aug 2013 04:36:08 +0000 (14:36 +1000)
commit17e8de7e1878bbd45f3e268932e997496ddbbfe7
treef7dc643d8809b2701be9d7547ddb680c19f2fd02
parentf748edafac858404be6c8dd67160c2032d97ddf5
powerpc: Unaligned stores and stmw are broken in emulation code

The stmw instruction was incorrectly decoded as an update form instruction
and thus the RA register was being clobbered.

Also, the utility routine to write memory to unaligned addresses breaks the
operation into smaller aligned accesses but was incorrectly incrementing
the address by only one; it needs to increment the address by the size of
the smaller aligned chunk.

Signed-off-by: Tom Musta <tmusta@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
arch/powerpc/lib/sstep.c