Re: [Qemu-devel] AMD64 Gentoo needs help

Re: [Qemu-devel] AMD64 Gentoo needs help

[jmf]

Try USE="softmmu" emerge qemu



I treid that and before the segfault below happen, now a black window appears and dissappears very quickly



$ qemu -hda netbsd_1.6.2.img -m 128 -pci

QEMU 0.6.0 monitor - type 'help' for more information

(qemu) Segmentation fault



$ linux32 qemu -hda netbsd_1.6.2.img -m 128 -pci

QEMU 0.6.0 monitor - type 'help' for more information

(qemu) Segmentation fault





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Re: [Qemu-devel] AMD64 Gentoo needs help

[Martin Garton]

On Thu, 23 Sep 2004, jmf wrote:

> 
> 
> 
> Try USE="softmmu" emerge qemu
> 
> 
> 
> I treid that and before the segfault below happen, now a black window appears and dissappears very quickly
> 
> 
> 
> $ qemu -hda netbsd_1.6.2.img -m 128 -pci
> 
> QEMU 0.6.0 monitor - type 'help' for more information
> 
> (qemu) Segmentation fault
> 
> 
> 
> $ linux32 qemu -hda netbsd_1.6.2.img -m 128 -pci
> 
> QEMU 0.6.0 monitor - type 'help' for more information
> 
> (qemu) Segmentation fault
> 
> 
> 
> 
> 
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Re: [Qemu-devel] AMD64 Gentoo needs help

[Martin Garton]

On Thu, 23 Sep 2004, jmf wrote:

> I treid that and before the segfault below happen, now a black window
> appears and dissappears very quickly

I believe the problem is that qemu is not 64bit clean code because it does 
things like casting from pointers to ints and back which is okay when they 
are the same size (ie, on x86) but not when a pointer is twice as long as 
an int (ie, on amd64) You will have seen warnings about this when 
compiling.

I looked at the code with a view to making it amd64 friendly, but I'm out 
of my depth.  If someone wants to give me some hints I might find some 
time to have another look though.

Regards,
Martin.

Re: [Qemu-devel] AMD64 Gentoo needs help

[J. Mayer]

On Thu, 2004-09-23 at 22:21, Martin Garton wrote:
> On Thu, 23 Sep 2004, jmf wrote:
> 
Hi,

> > I treid that and before the segfault below happen, now a black window
> > appears and dissappears very quickly
> 
> I believe the problem is that qemu is not 64bit clean code because it does 
> things like casting from pointers to ints and back which is okay when they 
> are the same size (ie, on x86) but not when a pointer is twice as long as 
> an int (ie, on amd64) You will have seen warnings about this when 
> compiling.

You may like to know that the ppc emulation runs well on amd64. A lots
of 64 bits cleanup have already been made. The warning you get during
compilation (should) concern only addresses in the emulated environment.
As qemu only emulates 32 bits machines for now, it's not a real issue.

The only way I ever succeeded running qemu-x86 on amd64 is to compile
and execute it into a 32 bits chrooted environment: I got a full 32 bits
gentoo into a separate partition to achieve this.

> 
> I looked at the code with a view to making it amd64 friendly, but I'm out 
> of my depth.  If someone wants to give me some hints I might find some 
> time to have another look though.

I think the issues may be located in or very near the x86 emulation
code. I never had the courage to compare step by step the execution in
the 32 bits vs the 64 bits environment to find where is the bug, but I
really think there is just a few bugs to locate and fix.

Regards.

-- 
J. Mayer <l_indien@magic.fr>
Never organized

Re: [Qemu-devel] AMD64 Gentoo needs help

[Johannes Schindelin]

Hi,

On Thu, 23 Sep 2004, J. Mayer wrote:
> On Thu, 2004-09-23 at 22:21, Martin Garton wrote:
> > I believe the problem is that qemu is not 64bit clean code because it does
> > things like casting from pointers to ints and back which is okay when they
> > are the same size (ie, on x86) but not when a pointer is twice as long as
> > an int (ie, on amd64) You will have seen warnings about this when
> > compiling.
>
> [...]
>
> I think the issues may be located in or very near the x86 emulation
> code. I never had the courage to compare step by step the execution in
> the 32 bits vs the 64 bits environment to find where is the bug, but I
> really think there is just a few bugs to locate and fix.
>

If this is an issue, then maybe you two could put your respective
i386-softemu/op.o somewhere on the web, so someone poor like me - who
cannot afford such a lovely 64-bit beast - can look at it (after all, the
GNU binutils are cross platform)?

Ciao,
Dscho

Re: [Qemu-devel] AMD64 Gentoo needs help

[Martin Garton]

On Fri, 24 Sep 2004, Johannes Schindelin wrote:

> If this is an issue, then maybe you two could put your respective
> i386-softemu/op.o somewhere on the web, so someone poor like me - who
> cannot afford such a lovely 64-bit beast - can look at it (after all, the
> GNU binutils are cross platform)?

I have put i386-softemu/op.o at  
http://wrasse.demon.co.uk/~martin/temp/op.o

Regards,
Martin.

[Qemu-devel] Re: AMD64 Gentoo needs help

[Gabriel Ebner]

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"J. Mayer" <l_indien@magic.fr> writes:

> The only way I ever succeeded running qemu-x86 on amd64 is to compile
> and execute it into a 32 bits chrooted environment: I got a full 32 bits
> gentoo into a separate partition to achieve this.

32-bit statically compiled qemu is working perfectly here outside the
chroot.  Did you have any problems with that setup because you had to
_run_ qemu inside the chroot?

      Gabriel.

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Re: [Qemu-devel] AMD64 Gentoo needs help

[Paul Brook]

On Thursday 23 September 2004 21:21, Martin Garton wrote:
> On Thu, 23 Sep 2004, jmf wrote:
> > I treid that and before the segfault below happen, now a black window
> > appears and dissappears very quickly
>
> I believe the problem is that qemu is not 64bit clean code because it does
> things like casting from pointers to ints and back which is okay when they
> are the same size (ie, on x86) but not when a pointer is twice as long as
> an int (ie, on amd64) You will have seen warnings about this when
> compiling.

Doesn't Gentoo use gcc3.4?
If so I'd guess it's more likely that this is the problem. gcc3.4 performs 
optimizations that break assumptions in the dyngen code.

Paul

[Qemu-devel] Re: AMD64 Gentoo needs help

[Gabriel Ebner]

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Hash: SHA1

Paul Brook <paul@codesourcery.com> writes:

> Doesn't Gentoo use gcc3.4?

qemu doesn't even compile with gcc-3.4 (gcc segfaults).  I filed a bug
at gcc.gnu.org, so it should get fixed somewhen.

    Gabriel.
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Re: [Qemu-devel] AMD64 Gentoo needs help

[jmf]

 --- On Thu 09/23, Paul Brook < paul@codesourcery.com > wrote:

Doesn't Gentoo use gcc3.4? f so I'd guess it's more likely that this is the problem. gcc3.4 performs optimizations that break assumptions in the dyngen code.





not unless you upgrade to gcc3.4, which I have not. I'm using gcc 3.3.4

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[Qemu-devel] AMD64 Gentoo needs help

[jmf]

I'm using gcc 3.3.4 on Gentoo for AMD64 ( kernel 2.6.9_rc1 ), which built qemu with out problems. Then I downloaded the netbsd image from FreeOSZoo and followed the README instructions, which say to run qemu like this



qemu -hda netbsd_1.6.2.img -m 128 -pci



in the Gentoo port ( I don't know about others ), there is no qemu binary but, there is a qemu-i386 binary so I made three attempts to run qemu:



$ qemu-i386 -hda netbsd_1.6.2.img -m 128 -pci

qemu-i386 version 0.6.0, Copyright (c) 2003-2004 Fabrice Bellard

usage: qemu-i386 [-h] [-d opts] [-L path] [-s size] program [arguments...]

Linux CPU emulator (compiled for i386 emulation)



-h           print this help

-L path      set the elf interpreter prefix (default=/usr/gnemul/qemu-i386)

-s size      set the stack size in bytes (default=524288)



debug options:

-d options   activate log (logfile=/tmp/qemu.log)

-p pagesize  set the host page size to 'pagesize'



$ qemu-i386 netbsd_1.6.2.img

Error loading netbsd_1.6.2.img



$ linux32 qemu-i386 -hda netbsd_1.6.2.img -m 128 -pci

( same usage message as above )



How do I run qemu with this image ?







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Re: [Qemu-devel] AMD64 Gentoo needs help

[Paul Brook]

On Thursday 23 September 2004 14:46, jmf wrote:
> I'm using gcc 3.3.4 on Gentoo for AMD64 ( kernel 2.6.9_rc1 ), which built
> qemu with out problems. Then I downloaded the netbsd image from FreeOSZoo
> and followed the README instructions, which say to run qemu like this
>
>
>
> qemu -hda netbsd_1.6.2.img -m 128 -pci
>
>
>
> in the Gentoo port ( I don't know about others ), there is no qemu binary
> but, there is a qemu-i386 binary so I made three attempts to run qemu:

qemu-386 is the linux usermode emulator. It sounds like you should be using 
the full system (aka softmmu) emulator.

Paul

Re: [Qemu-devel] AMD64 Gentoo needs help

[Andrew Wilkinson]

On Thu, 23 Sep 2004 09:46:25 -0400 (EDT), jmf <jmfguy@excite.com> wrote:
> I'm using gcc 3.3.4 on Gentoo for AMD64 ( kernel 2.6.9_rc1 ), which built qemu with out problems. Then I downloaded the netbsd image from FreeOSZoo and followed the README instructions, which say to run qemu like this
> 
> qemu -hda netbsd_1.6.2.img -m 128 -pci

Try USE="softmmu" emerge qemu.

HTH,
Andrew