[Xen-devel] Problem with config file

["frittitta1@xxxxxxxxxxx" <frittitta1@xxxxxxxxxxx>]

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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