Commit 22d8b3de authored Apr 19, 2017 by Naveen N. Rao Committed by Michael Ellerman Apr 20, 2017

powerpc/kprobes: Emulate instructions on kprobe handler re-entry



On kprobe handler re-entry, try to emulate the instruction rather than single
stepping always.

Acked-by: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

parent 1cabd2f8

arch/powerpc/kernel/kprobes.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -277,6 +277,14 @@ int __kprobes kprobe_handler(struct pt_regs *regs)
		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) {