From: Max Filippov <jcmvbkbc@gmail.com>
Date: Thu, 25 Jun 2015 20:03:29 +0000 (+0300)
Subject: xtensa: keep exception/interrupt stack continuous
X-Git-Tag: omap-for-v4.3/fixes-merge-window~39^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b6569439f1cec0ce15f647e2ba814431b5930b82;p=pandora-kernel.git

xtensa: keep exception/interrupt stack continuous

Restore original a0 in the kernel exception stack frame. This way it
looks like the frame that got interrupt/exception did alloca (copy a0 and
a1 spilled under old stack to the new location as well) to save registers
and then did a call to handler.
The point where interrupt/exception was taken is not in the stack chain,
only in pt_regs (call4 from that address can be simulated to keep it in
the stack trace).

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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