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handle_sys question

To: linux-mips <linux-mips@linux-mips.org>
Subject: handle_sys question
From: Songmao Tian <kingkongmao@gmail.com>
Date: Tue, 22 May 2012 17:40:20 +0800
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Hello all:
   In handle_sys there's a
50         sw      a3, PT_R26(sp)          # save a3 for syscall restarting

I woner why it need to save  a3 in R26(k0) slot in the stack?

Thanks,
songmao
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