Re: [PATCH] sparc: Fix handling of orig_i0 wrt. debugging when restarting syscalls.

[David Miller <davem@xxxxxxxxxxxxx>]

From: David Miller <davem@xxxxxxxxxxxxx>
Date: Mon, 14 Nov 2011 23:53:51 -0500 (EST)

> Luckily we can solve this problem without having to make debuggers
> aware of the issue.  Across system calls, several registers are
> considered volatile and can be safely clobbered.
> 
> Therefore we use the pt_regs save area of one of those registers, %g2,
> as a place to save and restore orig_i0.

Unfortunately this doesn't work, for example the clone implementation
in glibc expects %g2 and several other global registers to be preserved
across a system call.

I'll need to find another place to stash this value away.
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