On Fri, 2016-07-22 at 17:27 +1000, Nicholas Piggin wrote:
> tabort_syscall runs with RI=1, so a nested recoverable machine
> check will load the paca into r13 and overwrite what we loaded
> it with, because exceptions returning to privileged mode do not
> restore r13.
>
> This has survived
tabort_syscall runs with RI=1, so a nested recoverable machine
check will load the paca into r13 and overwrite what we loaded
it with, because exceptions returning to privileged mode do not
restore r13.
Fixes: b4b56f9ecab4 (powerpc/tm: Abort syscalls in active transactions)
Cc:
On Fri, 2016-07-22 at 17:27 +1000, Nicholas Piggin wrote:
> tabort_syscall runs with RI=1, so a nested recoverable machine
> check will load the paca into r13 and overwrite what we loaded
> it with, because exceptions returning to privileged mode do not
> restore r13.
>
> This has survived
tabort_syscall runs with RI=1, so a nested recoverable machine
check will load the paca into r13 and overwrite what we loaded
it with, because exceptions returning to privileged mode do not
restore r13.
This has survived testing with sc instruction inside transaction
(bare sc, not glibc syscall
