Re: [Xen-devel] [PATCH] extend qemu-dm.debug to use ddd for device model debugging

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Andrew D. Ball wrote:

> This patch modifies the qemu-dm.debug shell script to call ddd.  I have tested 
> it with
> xm-test against xen-unstable.hg changeset 8497, with no evidence of regression.
>
> Andrew
>
> ==================
> Andrew D. Ball
> aball@xxxxxxxxxx
> 'Festina lente'
>
>
> Add support to the qemu-dm.debug script to launch a ddd window running
> gdb on the device model for fully virtualized domU's.
>
> Signed-off-by: Chip Blach <chipper@xxxxxxxxxx>
> Signed-off-by: Andrew D. Ball <aball@xxxxxxxxxx>
>
> diff -r 9efe7eb108e1 tools/examples/xmexample.vmx
> --- a/tools/examples/xmexample.vmx      Wed Jan  4 17:51:38 2006
> +++ b/tools/examples/xmexample.vmx      Thu Jan  5 18:10:24 2006
> @@ -100,6 +100,15 @@
>
> # New stuff
> device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'
> +# Use this instead for device model debugging [launches ddd in a new window 
> +# for qemu-dm]
> +#
> +# To get debugging symbols in qemu-dm, you can copy 
> +#   tools/ioemu/target-i386-dm/qemu-dm from a built Xen source tree to
> +# /usr/lib/xen/bin/qemu-dm or /usr/lib64/xen/bin/qemu-dm , depending
> +# on where your qemu-dm sits
> +#device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm.debug'
> +
>
> #-----------------------------------------------------------------------------
> # Disk image for 
> diff -r 9efe7eb108e1 tools/ioemu/target-i386-dm/qemu-dm.debug
> --- a/tools/ioemu/target-i386-dm/qemu-dm.debug  Wed Jan  4 17:51:38 2006
> +++ b/tools/ioemu/target-i386-dm/qemu-dm.debug  Thu Jan  5 18:10:24 2006
> @@ -1,5 +1,26 @@
> -#!/bin/sh
> +#!/bin/bash
> +# Subject to GPL version 2 license.
> +#
> +# Chip Blach <chipper@xxxxxxxxxx>
> +# Andrew D. Ball <aball@xxxxxxxxxx>
> + 
> +cd ~root # why does ~ mean '/' instead of '/root' here?
~/ expands to the current users home directory.

~word expands to user word's home directory.

You may want to check for ddd and just invoke gdb if ddd is not available.

Regards,

Anthony Liguori

> -echo $* > /tmp/args
> -echo $DISPLAY >> /tmp/args
> -exec /usr/lib/xen/bin/qemu-dm $*
> +if [[ -z "$IOEMU" ]]
> +then 
> +	# Guess where the device model (qemu-dm) sits, based
> +       # on architecture
> +       if [[ $(uname -p) == 'x86_64' ]]
> +       then
> +               IOEMU=/usr/lib64/xen/bin/qemu-dm
> +       else
> +               IOEMU=/usr/lib/xen/bin/qemu-dm
> +       fi
> +fi
> +       
> +# set up gdb
> +echo "file $IOEMU" > ioemu_debug
> +echo "set args $@" >> ioemu_debug
> +echo "break main" >> ioemu_debug
> +
> +nohup ddd --gdb --debugger "gdb -x ioemu_debug" &
>
>  
>
> ------------------------------------------------------------------------
>
> Add support to the qemu-dm.debug script to launch a ddd window running
> gdb on the device model for fully virtualized domU's.
>
> Signed-off-by: Chip Blach <chipper@xxxxxxxxxx>
> Signed-off-by: Andrew D. Ball <aball@xxxxxxxxxx>
>
> diff -r 9efe7eb108e1 tools/examples/xmexample.vmx
> --- a/tools/examples/xmexample.vmx      Wed Jan  4 17:51:38 2006
> +++ b/tools/examples/xmexample.vmx      Thu Jan  5 18:10:24 2006
> @@ -100,6 +100,15 @@
>
> # New stuff
> device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'
> +# Use this instead for device model debugging [launches ddd in a new window 
> +# for qemu-dm]
> +#
> +# To get debugging symbols in qemu-dm, you can copy 
> +#   tools/ioemu/target-i386-dm/qemu-dm from a built Xen source tree to
> +# /usr/lib/xen/bin/qemu-dm or /usr/lib64/xen/bin/qemu-dm , depending
> +# on where your qemu-dm sits
> +#device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm.debug'
> +
>
> #-----------------------------------------------------------------------------
> # Disk image for 
> diff -r 9efe7eb108e1 tools/ioemu/target-i386-dm/qemu-dm.debug
> --- a/tools/ioemu/target-i386-dm/qemu-dm.debug  Wed Jan  4 17:51:38 2006
> +++ b/tools/ioemu/target-i386-dm/qemu-dm.debug  Thu Jan  5 18:10:24 2006
> @@ -1,5 +1,26 @@
> -#!/bin/sh
> +#!/bin/bash
> +# Subject to GPL version 2 license.
> +#
> +# Chip Blach <chipper@xxxxxxxxxx>
> +# Andrew D. Ball <aball@xxxxxxxxxx>
> + 
> +cd ~root # why does ~ mean '/' instead of '/root' here?
> -echo $* > /tmp/args
> -echo $DISPLAY >> /tmp/args
> -exec /usr/lib/xen/bin/qemu-dm $*
> +if [[ -z "$IOEMU" ]]
> +then 
> +	# Guess where the device model (qemu-dm) sits, based
> +       # on architecture
> +       if [[ $(uname -p) == 'x86_64' ]]
> +       then
> +               IOEMU=/usr/lib64/xen/bin/qemu-dm
> +       else
> +               IOEMU=/usr/lib/xen/bin/qemu-dm
> +       fi
> +fi
> +       
> +# set up gdb
> +echo "file $IOEMU" > ioemu_debug
> +echo "set args $@" >> ioemu_debug
> +echo "break main" >> ioemu_debug
> +
> +nohup ddd --gdb --debugger "gdb -x ioemu_debug" &
>  
>
> ------------------------------------------------------------------------
>
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>  

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