Date: Wed, 6 Aug 2014 17:19:32 +0100 From: Matt Fleming <matt@console-pimps.org> To: Eric van Gyzen <eric@vangyzen.net> Cc: freebsd-hackers@freebsd.org Subject: Re: Sanity Check: Bogus(?) General Protection Fault Message-ID: <20140806161932.GG15082@console-pimps.org> In-Reply-To: <53E24FF0.7030305@vangyzen.net> References: <53E237B6.4040703@vangyzen.net> <20140806144833.GE15082@console-pimps.org> <53E24FF0.7030305@vangyzen.net>
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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). -- Matt Fleming, Intel Open Source Technology Center
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