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[PATCH 1/2] powerpc: kretprobes: override default function entry offset

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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 fce05a38851c..331751701fed 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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Thread

[PATCH] kretprobes: reject registration if a symbol offset is specified "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-14 09:40 +0100
  Re: [PATCH] kretprobes: reject registration if a symbol offset is  specified Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> - 2017-02-14 09:50 +0100
  Re: [PATCH] kretprobes: reject registration if a symbol offset is  specified Masami Hiramatsu <mhiramat@kernel.org> - 2017-02-14 11:40 +0100
    Re: [PATCH] kretprobes: reject registration if a symbol offset is  specified "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-15 19:00 +0100
      [PATCH 3/3] perf: revert "perf probe: Fix probing kretprobes" "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-15 19:20 +0100
        Re: [PATCH 3/3] perf: revert "perf probe: Fix probing kretprobes" Masami Hiramatsu <mhiramat@kernel.org> - 2017-02-16 00:50 +0100
      [PATCH 1/3] kretprobes: ensure probe location is at function entry "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-15 19:20 +0100
        [PATCH 2/3] trace/kprobes: allow return probes with offsets and absolute addresses "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-15 19:20 +0100
          Re: [PATCH 2/3] trace/kprobes: allow return probes with offsets and  absolute addresses Masami Hiramatsu <mhiramat@kernel.org> - 2017-02-16 00:50 +0100
        Re: [PATCH 1/3] kretprobes: ensure probe location is at function  entry Masami Hiramatsu <mhiramat@kernel.org> - 2017-02-16 00:50 +0100
          Re: [PATCH 1/3] kretprobes: ensure probe location is at function  entry "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-16 09:00 +0100
        [PATCH 0/2] powerpc: kretprobe updates "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-16 09:20 +0100
          [PATCH 1/2] powerpc: kretprobes: override default function entry offset "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-16 09:20 +0100
          [PATCH 2/2] perf: powerpc: choose LEP with kretprobes "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-16 09:20 +0100
          Re: [PATCH 0/2] powerpc: kretprobe updates Masami Hiramatsu <mhiramat@kernel.org> - 2017-02-17 11:50 +0100
            Re: [PATCH 0/2] powerpc: kretprobe updates Arnaldo Carvalho de Melo <acme@kernel.org> - 2017-02-17 21:50 +0100
              Re: [PATCH 0/2] powerpc: kretprobe updates Masami Hiramatsu <mhiramat@kernel.org> - 2017-02-19 05:50 +0100
                Re: [PATCH 0/2] powerpc: kretprobe updates "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-20 11:00 +0100
                Re: [PATCH 0/2] powerpc: kretprobe updates Masami Hiramatsu <mhiramat@kernel.org> - 2017-02-21 14:10 +0100
                Re: [PATCH 0/2] powerpc: kretprobe updates "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-22 14:50 +0100
              Re: [PATCH 0/2] powerpc: kretprobe updates "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-20 10:50 +0100
              Re: [PATCH 0/2] powerpc: kretprobe updates "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> - 2017-02-20 12:50 +0100
                Re: [PATCH 0/2] powerpc: kretprobe updates Masami Hiramatsu <mhiramat@kernel.org> - 2017-02-21 14:10 +0100
      Re: [PATCH] kretprobes: reject registration if a symbol offset is  specified Masami Hiramatsu <mhiramat@kernel.org> - 2017-02-16 00:30 +0100

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