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| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2017-04-19 18:21:05 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-20 23:18:56 +1000 |
| commit | 22d8b3dec214cd43a773f621f95d254c50d2a092 (patch) | |
| tree | 8cf9983da50372af9888491d8b155c646f217edd /arch/powerpc/kernel/kprobes.c | |
| parent | 1cabd2f8f720a0ed612139547acb655495b23e8b (diff) | |
| download | linux-22d8b3dec214cd43a773f621f95d254c50d2a092.tar.gz linux-22d8b3dec214cd43a773f621f95d254c50d2a092.tar.bz2 linux-22d8b3dec214cd43a773f621f95d254c50d2a092.zip | |
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>
Diffstat (limited to 'arch/powerpc/kernel/kprobes.c')
| -rw-r--r-- | arch/powerpc/kernel/kprobes.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index ed5a917c2edd..b71922618ed2 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -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) { |