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Commit f15706b7 authored by Anton Arapov's avatar Anton Arapov Committed by Oleg Nesterov
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uretprobes/powerpc: Hijack return address 



Hijack the return address and replace it with a trampoline address.
PowerPC implementation.

Signed-off-by: default avatarAnton Arapov <anton@redhat.com>
Acked-by: default avatarAnanth N Mavinakayanahalli <ananth@in.ibm.com>
Acked-by: default avatarSrikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
parent 791eca10

arch/powerpc/include/asm/uprobes.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

arch/powerpc/kernel/uprobes.c

+13 −0
Original line number Diff line number Diff line
@@ -192,3 +192,16 @@ 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;

}