Messages in this thread Patch in this message | | | From | "Naveen N. Rao" <> | Subject | [PATCH 3/3] powerpc: kprobes: emulate instructions on kprobe handler re-entry | Date | Tue, 14 Feb 2017 14:08:03 +0530 |
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On kprobe handler re-entry, try to emulate the instruction rather than single stepping always.
As a related change, remove the duplicate saving of msr as that is already done in set_current_kprobe()
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> --- arch/powerpc/kernel/kprobes.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index 9cdf2de31e9e..c213637b9d25 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -206,10 +206,17 @@ int __kprobes kprobe_handler(struct pt_regs *regs) */ save_previous_kprobe(kcb); set_current_kprobe(p, regs, kcb); - kcb->kprobe_saved_msr = regs->msr; kprobes_inc_nmissed_count(p); prepare_singlestep(p, regs); kcb->kprobe_status = KPROBE_REENTER; + if (p->ainsn.boostable >= 0) { + ret = try_to_emulate(p, regs); + + if (ret > 0) { + restore_previous_kprobe(kcb); + return 1; + } + } return 1; } else { if (*addr != BREAKPOINT_INSTRUCTION) { -- 2.11.0
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