From: Anton Arapov <anton@redhat.com>
Date: Wed, 3 Apr 2013 16:00:35 +0000 (+0200)
Subject: uretprobes: Return probe entry, prepare_uretprobe()
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~119^2~9^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0dfd0eb8e4d72ded8b21f4fee74ba5547408cbe9;p=pandora-kernel.git

uretprobes: Return probe entry, prepare_uretprobe()

When a uprobe with return probe consumer is hit, prepare_uretprobe()
function is invoked. It creates return_instance, hijacks return address
and replaces it with the trampoline.

* Return instances are kept as stack per uprobed task.
* Return instance is chained, when the original return address is
  trampoline's page vaddr (e.g. recursive call of the probed function).

Signed-off-by: Anton Arapov <anton@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---

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