On Wed, Apr 03, 2013 at 06:00:34PM +0200, Anton Arapov wrote:
> Hijack the return address and replace it with a trampoline address.
> PowerPC implementation.
>
> Signed-off-by: Anton Arapov <an...@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <ana...@in.ibm.com>
> ---
> arch/powerpc/include/asm/uprobes.h | 1 +
> arch/powerpc/kernel/uprobes.c | 13 +++++++++++++
> 2 files changed, 14 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/uprobes.h
> b/arch/powerpc/include/asm/uprobes.h
> index b532060..2301602 100644
> --- a/arch/powerpc/include/asm/uprobes.h
> +++ b/arch/powerpc/include/asm/uprobes.h
> @@ -51,4 +51,5 @@ extern int arch_uprobe_post_xol(struct arch_uprobe *aup,
> struct pt_regs *regs);
> extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
> extern int arch_uprobe_exception_notify(struct notifier_block *self,
> unsigned long val, void *data);
> extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs
> *regs);
> +extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long
> trampoline_vaddr, struct pt_regs *regs);
> #endif /* _ASM_UPROBES_H */
> diff --git a/arch/powerpc/kernel/uprobes.c b/arch/powerpc/kernel/uprobes.c
> index bc77834..567b975 100644
> --- a/arch/powerpc/kernel/uprobes.c
> +++ b/arch/powerpc/kernel/uprobes.c
> @@ -188,3 +188,16 @@ bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe,
> struct pt_regs *regs)
>
> return false;
> }
> +
> +unsigned long
> +arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct
> pt_regs *regs)
> +{
> + unsigned long orig_ret_vaddr;
> +
> + orig_ret_vaddr = regs->link;
> +
> + /* Replace the return addr with trampoline addr */
> + regs->link = trampoline_vaddr;
> +
> + return orig_ret_vaddr;
> +}
> --
> 1.8.1.4
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