From: Fabrice Bellard <fabrice@bellard.org>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Wrong Exception - should have GPF instead of PF for NULL selector
Date: Sun, 13 Jun 2004 15:22:08 +0200 [thread overview]
Message-ID: <40CC5500.6010801@bellard.org> (raw)
In-Reply-To: <1087050882.597.6.camel@pcgem.rdg.cyberkinetica.com>
Antony T Curtis wrote:
> I have been looking at why OS/2 Warp Connect fails to start Presentation
> Manager under QEMU and I have found the following...
>
> We get a Page Fault when QEMU encounters the following instruction
>
> 0xfe0a9971: mov %es:(%si),%ebx
>
> Where ES=0x0000 and ESI=0xabde0000
>
> This should generate a General Protection exception as we are accessing
> memory using a NULL selector
>
> I don't know if it would fix OS/2 but it is definitely behaviour which
> is 'not correct'.
OK, it is not correct, but it is not the cause of the problem: I tried
to generate a GPF and I have the same bug. Moreover, I looked at the
code before and %es is really set to zero...
Fabrice.
next prev parent reply other threads:[~2004-06-13 13:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-12 14:34 [Qemu-devel] Wrong Exception - should have GPF instead of PF for NULL selector Antony T Curtis
2004-06-12 16:28 ` malc
2004-06-13 13:22 ` Fabrice Bellard [this message]
2004-06-13 15:22 ` Fabrice Bellard
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