[PATCH v2 2/5] powerpc: kretprobes: override default function entry offset

From	"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	[PATCH v2 2/5] powerpc: kretprobes: override default function entry offset
Date	2017-02-22 15:00 +0100
Message-ID	<tdFCy-2v3-5@gated-at.bofh.it> (permalink)
References	<tdFCx-2v3-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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With ABIv2, we offset 8 bytes into a function to get at the local entry
point.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
 arch/powerpc/kernel/kprobes.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index 735ff3d3f77d..e37b76b8b6b2 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -131,6 +131,15 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
 	kcb->kprobe_saved_msr = regs->msr;
 }
 
+bool arch_function_offset_within_entry(unsigned long offset)
+{
+#ifdef PPC64_ELF_ABI_v2
+	return offset <= 8;
+#else
+	return !offset;
+#endif
+}
+
 void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
 				      struct pt_regs *regs)
 {
-- 
2.11.0

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[PATCH v2 2/5] powerpc: kretprobes: override default function entry offset "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-22 15:00 +0100
  Re: [PATCH v2 2/5] powerpc: kretprobes: override default function  entry offset Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-24 21:00 +0100
    Re: [PATCH v2 2/5] powerpc: kretprobes: override default function entry offset Michael Ellerman <mpe@ellerman.id.au> - 2017-02-27 20:00 +0100
  Re: [PATCH v2 2/5] powerpc: kretprobes: override default function  entry offset Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> - 2017-02-25 03:50 +0100

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