From: Will Deacon <will.deacon@arm.com>
Date: Fri, 29 Aug 2014 15:11:10 +0000 (+0100)
Subject: arm64: report correct stack pointer in KSTK_ESP for compat tasks
X-Git-Tag: fixes-v3.17-rc4~33^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3168a743461ecf86adf3e7dcfcd79271828fb263;p=pandora-kernel.git

arm64: report correct stack pointer in KSTK_ESP for compat tasks

The KSTK_ESP macro is used to determine the user stack pointer for a
given task. In particular, this is used to to report the '[stack]' VMA
in /proc/self/maps, which is used by Android to determine the stack
location for children of the main thread.

This patch fixes the macro to use user_stack_pointer instead of directly
returning sp. This means that we report w13 instead of sp, since the
former is used as the stack pointer when executing in AArch32 state.

Cc: <stable@vger.kernel.org>
Reported-by: Serban Constantinescu <Serban.Constantinescu@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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