From b6569439f1cec0ce15f647e2ba814431b5930b82 Mon Sep 17 00:00:00 2001
From: Max Filippov <jcmvbkbc@gmail.com>
Date: Thu, 25 Jun 2015 23:03:29 +0300
Subject: [PATCH] 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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