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

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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>
This commit is contained in:
Naveen N. Rao 2017-04-19 18:21:05 +05:30 committed by Michael Ellerman
parent 1cabd2f8f7
commit 22d8b3dec2
1 changed files with 8 additions and 0 deletions
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8
arch/powerpc/kernel/kprobes.c
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@ -277,6 +277,14 @@ int __kprobes kprobe_handler(struct pt_regs *regs)
kprobes_inc_nmissed_count(p); kprobes_inc_nmissed_count(p);
prepare_singlestep(p, regs); prepare_singlestep(p, regs);
kcb->kprobe_status = KPROBE_REENTER; 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; return 1;
} else { } else {
if (*addr != BREAKPOINT_INSTRUCTION) { if (*addr != BREAKPOINT_INSTRUCTION) {