Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1626096
| From | "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v3 6/7] powerpc: kprobes: emulate instructions on kprobe handler re-entry |
| Date | 2017-04-19 15:00 +0200 |
| Message-ID | <txXnd-3yQ-71@gated-at.bofh.it> (permalink) |
| References | <txXnb-3yQ-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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>
---
arch/powerpc/kernel/kprobes.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index 46e8c1e03ce4..067e9863bfdf 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -276,6 +276,14 @@ 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) {
--
2.12.1
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[PATCH v3 0/7] powerpc: a few kprobe fixes and refactoring "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-04-19 15:00 +0200
[PATCH v3 5/7] powerpc: kprobes: factor out code to emulate instruction into a helper "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-04-19 15:00 +0200
Re: [PATCH v3 5/7] powerpc: kprobes: factor out code to emulate instruction into a helper Masami Hiramatsu <mhiramat@kernel.org> - 2017-04-19 16:50 +0200
[PATCH v3 1/7] kprobes: convert kprobe_lookup_name() to a function "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-04-19 15:00 +0200
[PATCH v3 6/7] powerpc: kprobes: emulate instructions on kprobe handler re-entry "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-04-19 15:00 +0200
Re: [PATCH v3 6/7] powerpc: kprobes: emulate instructions on kprobe handler re-entry Masami Hiramatsu <mhiramat@kernel.org> - 2017-04-19 16:50 +0200
Re: [PATCH v3 6/7] powerpc: kprobes: emulate instructions on kprobe handler re-entry "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-04-19 18:50 +0200
Re: [PATCH v3 6/7] powerpc: kprobes: emulate instructions on kprobe handler re-entry Michael Ellerman <mpe@ellerman.id.au> - 2017-04-20 08:20 +0200
Re: [PATCH v3 6/7] powerpc: kprobes: emulate instructions on kprobe handler re-entry Masami Hiramatsu <mhiramat@kernel.org> - 2017-04-21 15:50 +0200
csiph-web