From mboxrd@z Thu Jan  1 00:00:00 1970
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	<CAOw7k5hcpmt26NppfrFENPWS9_g6jD=XMhQzVMeS1usGQrwL0w@mail.gmail.c>
	<1f44256f014adb8ba778c7fdf5951b43@brasstown.quanstro.net>
Date: Mon, 21 Nov 2011 15:14:10 -0800
Message-ID: <CAOw7k5it_OV56ZNnPygDjh+rA=xC-+-x+DJuSWBCBRC-XhXECw@mail.gmail.com>
From: Charles Forsyth <charles.forsyth@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] sysrfork fp bug?
Topicbox-Message-UUID: 42f4d482-ead7-11e9-9d60-3106f5b1d025

it only needs to save the non-register state (ie, the control register
you'd wondered about),
but it's free to do more if that's somehow easier, even if the values
will never be used.
on BG/P, the equivalent function does:
	 * If there isn't a pending exception, just save the
	 * initial state and current status, because registers
	 * were killed by the system call.