Xen devel - Aug 2006 - I have a problem with my config file

Hi,
I would write a simple program for Xen which print I simple 
message 
on the screen.
I wrote an assembler procedure to print an 
helloworld 
message:

.text
.globl _start
_start:
cld

# from 
include/asm-xeno/hypervisor.h

movl $2,%
eax # 
__HYPERVISOR_console_write (include/asm-
xeno/hypervisor-ifs/hypervisor-
if.h)
movl $hello_message,%
ebx # arg1 = buffer virtual address
movl 
$hello_message_len,%ecx # arg2 = buffer length
int $0x82

# from 
include/asm-xeno/hypervisor.h

movl $8,%
eax # __HYPERVISOR_sched_op
movl $1,%
ebx # SCHEDOP_exit
int $0x82

hang: 
jmp hang # shouldn''t get 
here

hello_message: .
ascii "This is the hello world program\n"
hello_message_len = 
. - hello_message

The Xen loader also wants a 12-
byte header on the 
image file. So I wrote a little assembler module 
(xenoguestheader.s) to 
handle that: 

.text
.globl _start
_start:
.
ascii "XenoGues" # read_kernel_header 
(tools/xc/lib/xc_linux_build.c)
.
long _start # - the 
kernel''s load address

The final image has to 
consist of the 12-bytes object code from xenoguestheader.s followed the 
object code from helloworld.s. Here is my makefile to accomplish that: 

helloworld.gz: helloworld.s xenoguestheader.raw
as -o helloworld.o -
a=helloworld.l helloworld.s
ld -Ttext 0x100000 -o helloworld.elf 
helloworld.o
objcopy -O binary -S -g helloworld.elf helloworld.raw
cat 
xenoguestheader.raw helloworld.raw | gzip > helloworld.gz

xenoguestheader.raw: xenoguestheader.s
as -o xenoguestheader.o 
xenoguestheader.s
ld -Ttext 0x100000 -o xenoguestheader xenoguestheader.
o
objcopy -O binary -S -g xenoguestheader xenoguestheader.raw

This 
makefile produce a helloworld.
elf. The problem is to write a config 
file to do start this program.
I would call 

xm create -c 
<config_file>

and to see the message on the screen. I wrote this 
option

kernel = "helloworld.elf"
memory = 32
name = "HelloWorld"
on_crash = ''destroy''

But when I run this command on the screen I read 
this message

Error: (22, ''Invalid argument'')


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