Re: [PATCH v3] scripts: add extract-vmlinux

[AmÃrico Wang]

Ping...

I don't know any way to check vmlinux, we can only check if it is ELF,
so this patch looks good.

Michal?

On Tue, Aug 16, 2011 at 4:46 PM, Corentin Chary <corentincj@xxxxxxxxxx> wrote:
> This script can be used to extract vmlinux from a compressed
> kernel image (bzImage, etc..). It's inspired from (a subset of)
> extract-ikconfig.
>
> It's something a lot of people have been looking for (mainly
> people with xen < 4 that doesn't support bzImages at all).
>
> Signed-off-by: Corentin Chary <corentincj@xxxxxxxxxx>
> ---
>
> Since v1:
> * update license
>
> Since v2:
> * add some comments
>
> Âscripts/extract-vmlinux | Â 62 +++++++++++++++++++++++++++++++++++++++++++++++
> Â1 files changed, 62 insertions(+), 0 deletions(-)
> Âcreate mode 100755 scripts/extract-vmlinux
>
> diff --git a/scripts/extract-vmlinux b/scripts/extract-vmlinux
> new file mode 100755
> index 0000000..4ab8517
> --- /dev/null
> +++ b/scripts/extract-vmlinux
> @@ -0,0 +1,62 @@
> +#!/bin/sh
> +# ----------------------------------------------------------------------
> +# extract-vmlinux - Extract uncompressed vmlinux from a kernel image
> +#
> +# Inspired from extract-ikconfig
> +# (c) 2009,2010 Dick Streefland <dick@xxxxxxxxxxxxxx>
> +#
> +# (c) 2011 Â Â ÂCorentin Chary <corentin.chary@xxxxxxxxx>
> +#
> +# Licensed under the GNU General Public License, version 2 (GPLv2).
> +# ----------------------------------------------------------------------
> +
> +check_vmlinux()
> +{
> + Â Â Â # Use readelf to check if it's a valid ELF
> + Â Â Â # TODO: find a better to way to check that it's really vmlinux
> + Â Â Â # Â Â Â and not just an elf
> + Â Â Â readelf -h $1 > /dev/null 2>&1 || return 1
> +
> + Â Â Â cat $1
> + Â Â Â exit 0
> +}
> +
> +try_decompress()
> +{
> + Â Â Â # The obscure use of the "tr" filter is to work around older versions of
> + Â Â Â # "grep" that report the byte offset of the line instead of the pattern.
> +
> + Â Â Â # Try to find the header ($1) and decompress from here
> +    for   pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"`
> + Â Â Â do
> + Â Â Â Â Â Â Â pos=${pos%%:*}
> + Â Â Â Â Â Â Â tail -c+$pos "$img" | $3 > $tmp 2> /dev/null
> + Â Â Â Â Â Â Â check_vmlinux $tmp
> + Â Â Â done
> +}
> +
> +# Check invocation:
> +me=${0##*/}
> +img=$1
> +if   [ $# -ne 1 -o ! -s "$img" ]
> +then
> + Â Â Â echo "Usage: $me <kernel-image>" >&2
> + Â Â Â exit 2
> +fi
> +
> +# Prepare temp files:
> +tmp=$(mktemp /tmp/vmlinux-XXX)
> +trap "rm -f $tmp" 0
> +
> +# Initial attempt for uncompressed images or objects:
> +check_vmlinux $img
> +
> +# That didn't work, so retry after decompression.
> +try_decompress '\037\213\010' xy  Âgunzip
> +try_decompress '\3757zXZ\000' abcde unxz
> +try_decompress 'BZh'     Âxy  Âbunzip2
> +try_decompress '\135\0\0\0'  xxx  unlzma
> +try_decompress '\211\114\132' xy  Â'lzop -d'
> +
> +# Bail out:
> +echo "$me: Cannot find vmlinux." >&2
> --
> 1.7.3.4
>
>
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