From: "andrzej zaborowski" <balrogg@gmail.com>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH]bug fix for softmmu slow_st unaligned access
Date: Wed, 31 Oct 2007 03:16:17 +0100 [thread overview]
Message-ID: <fb249edb0710301916ifd6c84fs96c7ce07024e1bf@mail.gmail.com> (raw)
In-Reply-To: <13449885.post@talk.nabble.com>
Hi,
On 28/10/2007, TeLeMan <geleman@gmail.com> wrote:
> For example, the memory address 0x10008000 is on an unwritable page.When the
> instruction "add dword ptr [0x10007FFF],0x12345678" is executed,the OS will
> set 0x10008000 page be a writable page and re-execute this instruction. But
> softmmu has modifed the value of 0x10007FFF,so after re-executing this
> instruction, the final result is wrong(double-added on 0x10007FFF).
> Reversing the stored byte order can fix this bug.
I'm not sure I understand, but what happens if now the 10008000 page
is writable and 10007fff isn't, thus the OS needs to make it writable
and re-execute? I guess reversing the accesses order is not a
solution?
Regards,
Andrew
next prev parent reply other threads:[~2007-10-31 2:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-28 4:00 [Qemu-devel] [PATCH]bug fix for softmmu slow_st unaligned access TeLeMan
2007-10-31 2:16 ` andrzej zaborowski [this message]
2007-10-31 2:59 ` TeLeMan
2007-11-17 9:54 ` andrzej zaborowski
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