Date: Wed, 06 Aug 2014 13:11:13 -0400 From: Eric van Gyzen <eric@vangyzen.net> To: Matt Fleming <matt@console-pimps.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Sanity Check: Bogus(?) General Protection Fault Message-ID: <53E261B1.5010108@vangyzen.net> In-Reply-To: <20140806161932.GG15082@console-pimps.org> References: <53E237B6.4040703@vangyzen.net> <20140806144833.GE15082@console-pimps.org> <53E24FF0.7030305@vangyzen.net> <20140806161932.GG15082@console-pimps.org>
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On 08/06/2014 12:19, Matt Fleming wrote: > On Wed, 06 Aug, at 11:55:28AM, Eric van Gyzen wrote: >> Thanks, Matt. That has always been my understanding (and I just found >> the docs to confirm). I doubted myself because the problem is now even >> more bizarre. The mov before the faulting instruction apparently didn't >> complete. %r11 is still an old value, not 0x....f7a8. > > The mov to %r11 isn't an immediate move, it's a memory read. So > %r11 will contain the *contents* of 0xffffffff809bf7a, not the address > itself (note the missing '$' as in the shr instruction above it). Argh! THAT was the sanity-check I needed. Thanks again, Matt. "It's always some mundane detail." --Michael Bolton Eric
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