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    Subject[PATCH] scripts: add extract-vmlinux
    Date
    This script can be used to extract vmlinux from a compressed
    kernel image (bzImage, etc..). It's inspired from (a subset of)
    extract-ikconfig.

    I don't know if this scripts really have this place in the kernel
    tree, but 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 <corentin.chary@gmail.com>
    ---
    scripts/extract-vmlinux | 60 +++++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 60 insertions(+), 0 deletions(-)
    create mode 100755 scripts/extract-vmlinux

    diff --git a/scripts/extract-vmlinux b/scripts/extract-vmlinux
    new file mode 100755
    index 0000000..444f404
    --- /dev/null
    +++ b/scripts/extract-vmlinux
    @@ -0,0 +1,60 @@
    +#!/bin/sh
    +# ----------------------------------------------------------------------
    +# extract-vmlinux - Extract uncompressed vmlinux from a kernel image
    +#
    +# The obscure use of the "tr" filter is to work around older versions of
    +# "grep" that report the byte offset of the line instead of the pattern.
    +#
    +# Inspired from extract-ikconfig
    +# (c) 2009,2010 Dick Streefland <dick@streefland.net>
    +#
    +# (c) 2011 Corentin Chary <corentin.chary@gmail.com>
    +# Licensed under the terms of the GNU General Public License.
    +# ----------------------------------------------------------------------
    +
    +check_elf()
    +{
    + # Use readelf to check if it's a valid ELF
    + # There is probably a better way to do that...
    + readelf -h $1 > /dev/null 2>&1 || return 1
    +
    + cat $1
    + exit 0
    +}
    +
    +try_decompress()
    +{
    + for pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"`
    + do
    + pos=${pos%%:*}
    + tail -c+$pos "$img" | $3 > $tmp 2> /dev/null
    + check_elf $tmp
    + done
    +}
    +
    +# Check invocation:
    +me=${0##*/}
    +img=$1
    +if [ $# -ne 1 -o ! -s "$img" ]
    +then
    + echo "Usage: $me <kernel-image>" >&2
    + exit 2
    +fi
    +
    +# Prepare temp files:
    +tmp=$(mktemp /tmp/vmlinux-XXX)
    +trap "rm -f $tmp" 0
    +
    +# Initial attempt for uncompressed images or objects:
    +check_elf $img
    +
    +# That didn't work, so retry after decompression.
    +try_decompress '\037\213\010' xy gunzip
    +try_decompress '\3757zXZ\000' abcde unxz
    +try_decompress 'BZh' xy bunzip2
    +try_decompress '\135\0\0\0' xxx unlzma
    +try_decompress '\211\114\132' xy 'lzop -d'
    +
    +# Bail out:
    +echo "$me: Cannot find vmlinux." >&2
    +exit 1
    --
    1.7.3.4


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