tree 8785a164fdaa422a146fdda4b21100189858f90d
parent a9c4e541ea9b22944da356f2a9258b4eddcc953b
author Tiejun Chen <tiejun.chen@windriver.com> 1347839671 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1347946365 +1000

powerpc/kprobe: Don't emulate store when kprobe stwu r1

We don't do the real store operation for kprobing 'stwu Rx,(y)R1'
since this may corrupt the exception frame, now we will do this
operation safely in exception return code after migrate current
exception frame below the kprobed function stack.

So we only update gpr[1] here and trigger a thread flag to mask
this.

Note we should make sure if we trigger kernel stack over flow.

Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>