Messages in this thread Patch in this message | | | From | Corentin Chary <> | Subject | [PATCH] scripts: add extract-vmlinux | Date | Thu, 4 Aug 2011 15:52:57 +0200 |
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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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