From: Struan Bartlett <struan@praguespringpeople.org>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Re: Suggestion - trap window-close of VM
Date: Wed, 30 Mar 2005 15:26:34 +0200 [thread overview]
Message-ID: <424AA90A.1060103@praguespringpeople.org> (raw)
In-Reply-To: <20050330124816.GA10714@xi.wantstofly.org>
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Lennert Buytenhek wrote:
>On Wed, Mar 30, 2005 at 02:20:36PM +0200, Struan Bartlett wrote:
>
>
>>It subtracts one from the EIP (to find the address of
>>the previously-executed instruction) and examines the virtual memory
>>location pointed to. If the memory location contains 0xF4 (HLT) then it
>>examines the EFLAGS register. If the IF (Interrupt-enable) flag is
>>cleared, then one might in fact assume that Windows 2000 is sitting
>>there just waiting for you to turn it off. The assumption here is that
>>if interrupts are disabled then there is no way the processor's halt
>>state can be interrupted.
>>
>>
>
>What happens if the previous instruction is a multi-byte instruction
>that happens to have 0xf4 as its last byte?
>
>
Before I did the IF check, that was a problem but now it should be ok.
In your scenario, the IF flag would probably be found still to be set so
it would be (correctly) assumed that Windows 2000 was not waiting to be
turned off and qemu would continue normally.
S
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next prev parent reply other threads:[~2005-03-30 13:53 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-27 3:49 [Qemu-devel] Suggestion - trap window-close of VM Ryan Rempel
2005-03-27 18:30 ` Struan Bartlett
2005-03-28 11:34 ` [patch] " Struan Bartlett
2005-03-28 12:51 ` Asko Kauppi
2005-03-28 13:04 ` Paul Brook
2005-03-29 22:37 ` [Qemu-devel] " Ryan Rempel
2005-03-29 22:52 ` Paul Brook
2005-03-30 1:17 ` Ryan Rempel
2005-03-30 12:20 ` Struan Bartlett
2005-03-30 12:48 ` Lennert Buytenhek
2005-03-30 13:26 ` Struan Bartlett [this message]
2005-03-30 18:22 ` Lennert Buytenhek
2005-03-30 20:16 ` Leonardo E. Reiter
2005-03-30 21:22 ` Lennert Buytenhek
2005-03-30 21:43 ` Struan Bartlett
2005-03-31 9:32 ` John R. Hogerhuis
2005-03-31 12:31 ` Lennert Buytenhek
2005-03-30 13:21 ` APM bug " Struan Bartlett
2005-03-31 10:38 ` Struan Bartlett
2005-03-31 17:56 ` Struan Bartlett
2005-04-03 22:00 ` A Fix " Struan Bartlett
2005-04-04 9:53 ` Struan Bartlett
2005-04-04 17:12 ` Struan Bartlett
2005-04-04 22:26 ` Iain McFarlane
2005-04-05 16:34 ` Volker Ruppert
2005-04-05 21:05 ` Iain McFarlane
2005-04-05 21:33 ` [Qemu-devel] Re: Windows 2000 SP4 (was Re: APM bug) Leonardo E. Reiter
2005-04-05 22:57 ` Hetz Ben Hamo
2005-04-05 23:03 ` Leonardo E. Reiter
2005-04-05 23:48 ` Hetz Ben Hamo
2005-04-06 0:28 ` Leonardo E. Reiter
2005-04-06 0:52 ` [Qemu-devel] Re: Windows 2000 SP4 Leonardo E. Reiter
2005-04-06 20:25 ` [Qemu-devel] Re: Windows 2000 SP4 (was Re: APM bug) Fabrice Bellard
2005-04-06 22:47 ` Hetz Ben Hamo
2005-04-07 7:17 ` Jonas Maebe
2005-04-07 11:56 ` Flavio Visentin
2005-04-05 23:40 ` Derek Fawcus
2005-04-07 16:42 ` A Fix Re: APM bug Re: [Qemu-devel] Re: Suggestion - trap window-closeof VM Andreas Bollhalder
2005-04-05 13:55 ` APM bug Re: [Qemu-devel] Re: Suggestion - trap window-close of VM Alex Beregszaszi
2005-03-31 16:38 ` Andreas Bollhalder
2005-03-31 17:32 ` Jason Gress
2005-05-07 16:30 ` [patch] on-quit-v0.21 with resume/suspend/power-off dialog Re: [patch] Re: [Qemu-devel] " Struan Bartlett
2005-05-09 15:43 ` Ryan Rempel
2005-05-09 22:25 ` Struan Bartlett
2005-05-09 23:19 ` Flavio Visentin
2005-05-10 8:40 ` Struan Bartlett
2005-07-29 0:07 ` [patch] " Struan Bartlett
2005-03-28 15:04 ` Mark Williamson
2005-03-28 19:13 ` Joshua Kugler
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