Commit a64e3f35 authored Mar 08, 2017 by Naveen N. Rao Committed by Michael Ellerman Apr 20, 2017

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>

parent 290e3070

arch/powerpc/kernel/kprobes.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -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)
		{