From: Goswin von Brederlow <goswin-v-b@web.de>
To: Max Filippov <jcmvbkbc@gmail.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Can't switch to 64bit mode at boot, how to debug?
Date: Sat, 17 Nov 2012 22:55:58 +0100 [thread overview]
Message-ID: <20121117215557.GA5632@frosties> (raw)
In-Reply-To: <CAMo8BfKNHJWE-2xb_zSbghoX51-eBTV+n7S0buqtDuSGnc=UVQ@mail.gmail.com>
On Sat, Nov 17, 2012 at 11:18:03PM +0300, Max Filippov wrote:
> On Sat, Nov 17, 2012 at 11:58 PM, Max Filippov <jcmvbkbc@gmail.com> wrote:
> > On Sat, Nov 17, 2012 at 9:50 PM, Goswin von Brederlow <goswin-v-b@web.de> wrote:
> >> /* Enable PAE */
> >> movl %cr4, %eax
> >> btsl $5, %eax
> >> movl %eax, %cr4
> >
> > Interestingly with the current HEAD the code disappears after this instruction:
>
> ...only from gdb output. xp in qemu monitor still works, looks like
> the issue here
> is with code access for gdb.
>
> Otherwise it works for me both with the current HEAD, and with v1.1.0.
> I built your kernel like this:
>
> gcc -I. -m32 test.S -nodefaultlibs -nostartfiles -Wl,-N -Wl,-Ttext
> -Wl,100000 -Wl,--build-id=none -o test
>
> --
> Thanks.
> -- Max
>
Args, the problem was that I used "qemu", which currently links to
qemu-system-i386 instead of "qemu-system-x86_64". A some point in the last
year the alternative setting must have reverted from x86_64 to the default
of i386.
MfG
Goswin
next prev parent reply other threads:[~2012-11-17 21:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-17 17:50 [Qemu-devel] Can't switch to 64bit mode at boot, how to debug? Goswin von Brederlow
2012-11-17 19:58 ` Max Filippov
2012-11-17 20:18 ` Max Filippov
2012-11-17 21:55 ` Goswin von Brederlow [this message]
2012-11-17 22:09 ` Goswin von Brederlow
2012-11-17 22:38 ` Max Filippov
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