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Date: Mon, 22 Oct 2012 17:18:11 -0600
From: Peter Grehan <grehan@freebsd.org>
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To: Jilles Tjoelker <jilles@stack.nl>
Subject: Re: svn commit: r241744 - projects/bhyve/usr.sbin/bhyve
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> Case 4 looks wrong. A 32-bit write clears the top 32 bits of the
> register instead of preserving them.

  Yep, you're right. How about:

 > +	case 4:
 > +		val = (reg & ~0xffffffffUL) | (operand & 0xffffffffUL);
 > +		break;

> I have no idea whether this will actually fix/break anything.

  Lucky so far but it would be sure to blow up in the future.

later,

Peter.