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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.

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>
This commit is contained in:
Naveen N. Rao
2017-03-08 13:56:07 +05:30
committed by Michael Ellerman
parent 290e307076
commit a64e3f35a4
1 changed files with 9 additions and 0 deletions
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9
arch/powerpc/kernel/kprobes.c
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@@ -189,6 +189,15 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
kcb->kprobe_saved_msr = regs->msr; 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, void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
struct pt_regs *regs) struct pt_regs *regs)
{ {