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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2017-03-08 13:56:07 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2017-04-20 23:18:55 +1000
commita64e3f35a45f4a84148d0ba30a3c75c4c7076928 (patch)
tree0ace3f325af79dc5daccba251c511f262bea7b4d /arch/powerpc/kernel/kprobes.c
parent290e3070762ac80e5fc4087d8c4de7e3f1d90aca (diff)
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powerpc/kretprobes: Override default function entry offset
With ABIv2, we offset 8 bytes into a function to get at the local entry point. mpe: NB this function is currently not called, the change to generic code to call it is being merged via the tip tree. Acked-by: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> 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.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index 65828fbc410d..97b5eed1f76d 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -189,6 +189,15 @@ 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)
{