Re: [XenARM] android emulator

["Michael R. Hines" <michael@xxxxxxxxxxxx>]

Hmmmm.... the XenARM wiki on xensource.com says that it's upstream =). That's why I assumed it was being maintained in a separate "invisible" branch, but as Sang-bum said, they're probably under NDA until the PV-linux version they're currently working on is supported in their own product first.

- Michael

Caz Yokoyama wrote:

I don’t think it is upstream. This is just my guess because I am not a person who developed. It is developed by Samsung as a research project or something. They disclosed the code. They don’t want to spend their resource for maintaining. Therefore, this mailing list is very quiet.

-caz

 

---

From: Michael R. Hines [mailto:michael@xxxxxxxxxxxx]
Sent: Monday, October 19, 2009 4:39 PM
To: Caz Yokoyama
Cc: xen-arm@xxxxxxxxxxxxxxxxxxx
Subject: Re: [XenARM] android emulator

 

That's true.

One more question: I thought xen-arm was upstream?

I downloaded xen-unstable.hg, but I don't see the arm code anywhere.

Do I have to change to a different mercurial branch to find it?

Thanks!

- Michael

Caz Yokoyama wrote:

Hello Michael,

What the nice idea full linux-2.6.21-arm and Android running upon Xen!

Qualcomm may be interested in.

-caz

-----Original Message-----

From: Michael R. Hines [mailto:michael@xxxxxxxxxxxx] 

Sent: Monday, October 19, 2009 4:19 PM

To: Caz Yokoyama

Cc: xen-arm@xxxxxxxxxxxxxxxxxxx

Subject: Re: [XenARM] android emulator

Actually, I got it to work. The problem was that that I was compiling on 

a 64-bit version of the ARM-ported emulator instead of a 32-bit version, 

so I logged into a 32-bit machine and attempted to compile it.

However, there was one snag before it worked: a patch is needed:

--- Taken from http://code.google.com/p/android/issues/detail?id=838

1.) A -msse2 cflags is missing in Makefile.target which make _mm_add_si64

cannot be found:

/android-emulator-20080826/qemu/skins/skin_argb.h:286: warning: implicit

declaration of function '_mm_add_si64'

/android-emulator-20080826/qemu/skins/skin_argb.h:286: error: incompatible

types in assignment

2.) The error comment in build-emulator.sh is wrong.

Patch:

--- qemu.orig/Makefile.target  2008-08-29 10:01:41.000000000 +0800

+++ qemu/Makefile.target       2008-08-29 10:01:24.000000000 +0800

@@ -39,7 +39,7 @@ endif

 ifeq ($(ARCH),i386)

 OP_CFLAGS=$(CFLAGS) -O2 -fomit-frame-pointer

-CFLAGS+=-DUSE_MMX -mmmx

+CFLAGS+=-DUSE_MMX -mmmx -msse2

 ifneq ($(CONFIG_DARWIN),yes)

 OP_CFLAGS+= -mpreferred-stack-boundary=2

 else

Once I applied this on a 32-bit Ubuntu 9.04 server box, the compile 

succeeded

and the two mini-os domains started running inside the emulator.

Cool stuff! Thank you very much for your quick response.

What is the possibility of getting a full linux-2.6.21-arm running 

inside the emulator?

Is that possible right now?

- Michael

Caz Yokoyama wrote:

Hello Michael,

What optimization option do you use? -O2? -O0? Don't use -O0. You will

have

segfault. Could you run backtrace command on segfault? In addition, please

provide more detail of your environment.

-caz

P.S. You may not hear from anybody other than me. This is a very quiet

mailing list.

-----Original Message-----

From: xen-arm-bounces@xxxxxxxxxxxxxxxxxxx

[mailto:xen-arm-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Michael R. Hines

Sent: Monday, October 19, 2009 12:58 PM

To: xen-arm@xxxxxxxxxxxxxxxxxxx

Subject: [XenARM] android emulator

Greetings,

I have followed all the instructions in the Secure XenARM manual and I

went through section A.2 on how to build XenARM for the Android

emulator. I successfully built the arm-port of Xen as well as the

arm-port of mini-os and I built the patched version of QEMU 0.82.

When I tried to run the emulator, I get a segfault - From what I can

tell, the fault occurs at the very first instruction when QEMU attempts

to start running the Xen hypervisor.

Here is the output of a sample GDB session:

$ gdb emulator

$ (gdb) run -guest0 0x01c00000 mini-os.elf -guest1 0x02c00000

mini-os.elf -show-kernel -system ./images -shell -qemu -s

Starting program: ../android-emulator-xen_arm/emulator -guest0

0x01c00000 mini-os.elf -guest1 0x02c00000 mini-os.elf -show-kernel

-system ./images  -shell -qemu -s

[Thread debugging using libthread_db enabled]

guest0 - mini-os.elf

guest1 - mini-os.elf

[New Thread 0x7f32a807c6f0 (LWP 5913)]

[New Thread 0x7f329e9f0950 (LWP 5916)]

[New Thread 0x7f329e1ef950 (LWP 5917)]

Waiting gdb connection on port 1234

Program received signal SIGSEGV, Segmentation fault.

[Switching to Thread 0x7f32a807c6f0 (LWP 5913)]

0x0000000000000000 in ?? ()

(gdb)

Any ideas on where I could start debugging this? Or are there updated

patches to make this work?

-- 

/*

 * Michael R. Hines

 * Post-Doc, Dept. of Computer Science

 * http://www.cs.columbia.edu/~mhines/

 * Live long and prosper...

 */

-- 
/*
 * Michael R. Hines
 * Post-Doc, Dept. of Computer Science
 * http://www.cs.columbia.edu/~mhines/
 * Live long and prosper...
 */

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