ppc32/kprobe: Fix a bug for kprobe stwu r1
There patches is used to fix that known kprobe bug,
[BUG?]3.0-rc4+ftrace+kprobe: set kprobe at instruction 'stwu' lead to system crash/freeze
https://lkml.org/lkml/2011/7/3/156
We withdraw the original way to provide a dedicated exception stack. Now we
implement this based on Ben's suggestion:
https://lkml.org/lkml/2011/11/30/327
Here I fix this bug only for ppc32 since Ben address another problem in ppc64
exception return codes. So I think I'd better send another patch to fix this
bug issued from ppc64 firstly. Then its convenient to merge this fix into ppc64.
Tiejun Chen (4):
powerpc/kprobe: introduce a new thread flag
ppc32/kprobe: introduce copy_exc_stack
ppc32/kprobe: complete kprobe and migrate exception frame
ppc32/kprobe: don't emulate store when kprobe stwu r1
arch/powerpc/include/asm/page_32.h | 1 +
arch/powerpc/include/asm/thread_info.h | 2 ++
arch/powerpc/kernel/entry_32.S | 26 ++++++++++++++++++++++++++
arch/powerpc/kernel/misc_32.S | 16 +++++++++++++++-
arch/powerpc/kernel/ppc_ksyms.c | 1 +
arch/powerpc/lib/sstep.c | 19 +++++++++++++++++--
6 files changed, 62 insertions(+), 3 deletions(-)
Tiejun