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Commit 7b76bfc8 authored by Dick Streefland's avatar Dick Streefland Committed by Steven Rostedt
Browse files

kconfig: simplification of scripts/extract-ikconfig 



I've rewritten the extract-ikconfig script to extract the kernel
configuration from a kernel compiled with CONFIG_IKCONFIG. The main
motivation for the rewrite was to remove the dependency on the
external C program binoffset.c, which is compiled on the initial run.

The binoffset executable is invoked with a relative path, which means
that the old script can only be run from the top of the kernel tree,
and only when you have write permission in the scripts directory.

The new script uses tr/grep/tail/zcat only, and can be invoked from
anywhere. The binoffset.c program has been removed. This script
requires GNU grep 2.5 (released 2002-03-13) or higher, because the -o
option was introduced in that version.

Signed-off-by: default avatarDick Streefland <dick@streefland.net>
LKML-Reference: <20091006203540.GA14634@streefland.net>
Tested-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 0eca52a9

Documentation/dontdiff

+0 −1
Original line number Diff line number Diff line
@@ -68,7 +68,6 @@ autoconf.h* 
bbootsect

bin2c

binkernel.spec

binoffset

bootsect

bounds.h

bsetup

scripts/.gitignore

+0 −1
Original line number Diff line number Diff line
@@ -6,5 +6,4 @@ kallsyms 
pnmtologo

bin2c

unifdef

binoffset

ihex2fw

scripts/binoffset.c

deleted100644 → 0
+0 −163
Original line number Diff line number Diff line 
/***************************************************************************

 * binoffset.c

 * (C) 2002 Randy Dunlap <rdunlap@xenotime.net>



#   This program is free software; you can redistribute it and/or modify

#   it under the terms of the GNU General Public License as published by

#   the Free Software Foundation; either version 2 of the License, or

#   (at your option) any later version.

#

#   This program is distributed in the hope that it will be useful,

#   but WITHOUT ANY WARRANTY; without even the implied warranty of

#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

#   GNU General Public License for more details.

#

#   You should have received a copy of the GNU General Public License

#   along with this program; if not, write to the Free Software

#   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.



# binoffset.c:

# - searches a (binary) file for a specified (binary) pattern

# - returns the offset of the located pattern or ~0 if not found

# - exits with exit status 0 normally or non-0 if pattern is not found

#   or any other error occurs.



****************************************************************/



#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/mman.h>



#define VERSION		"0.1"

#define BUF_SIZE	(16 * 1024)

#define PAT_SIZE	100



char		*progname;

char		*inputname;

int		inputfd;

unsigned int	bix;			/* buf index */

unsigned char	patterns [PAT_SIZE] = {0}; /* byte-sized pattern array */

int		pat_len;		/* actual number of pattern bytes */

unsigned char	*madr;			/* mmap address */

size_t		filesize;

int		num_matches = 0;

off_t		firstloc = 0;



void usage (void)

{

	fprintf (stderr, "%s ver. %s\n", progname, VERSION);

	fprintf (stderr, "usage:  %s filename pattern_bytes\n",

			progname);

	fprintf (stderr, "        [prints location of pattern_bytes in file]\n");

	exit (1);

}



void get_pattern (int pat_count, char *pats [])

{

	int ix, err, tmp;



#ifdef DEBUG

	fprintf (stderr,"get_pattern: count = %d\n", pat_count);

	for (ix = 0; ix < pat_count; ix++)

		fprintf (stderr, "  pat # %d:  [%s]\n", ix, pats[ix]);

#endif



	for (ix = 0; ix < pat_count; ix++) {

		tmp = 0;

		err = sscanf (pats[ix], "%5i", &tmp);

		if (err != 1 || tmp > 0xff) {

			fprintf (stderr, "pattern or value error in pattern # %d [%s]\n",

					ix, pats[ix]);

			usage ();

		}

		patterns [ix] = tmp;

	}

	pat_len = pat_count;

}



void search_pattern (void)

{

	for (bix = 0; bix < filesize; bix++) {

		if (madr[bix] == patterns[0]) {

			if (memcmp (&madr[bix], patterns, pat_len) == 0) {

				if (num_matches == 0)

					firstloc = bix;

				num_matches++;

			}

		}

	}

}



#ifdef NOTDEF

size_t get_filesize (int fd)

{

	off_t end_off = lseek (fd, 0, SEEK_END);

	lseek (fd, 0, SEEK_SET);

	return (size_t) end_off;

}

#endif



size_t get_filesize (int fd)

{

	int err;

	struct stat stat;



	err = fstat (fd, &stat);

	fprintf (stderr, "filesize: %ld\n", err < 0 ? (long)err : stat.st_size);

	if (err < 0)

		return err;

	return (size_t) stat.st_size;

}



int main (int argc, char *argv [])

{

	progname = argv[0];



	if (argc < 3)

		usage ();



	get_pattern (argc - 2, argv + 2);



	inputname = argv[1];



	inputfd = open (inputname, O_RDONLY);

	if (inputfd == -1) {

		fprintf (stderr, "%s: cannot open '%s'\n",

				progname, inputname);

		exit (3);

	}



	filesize = get_filesize (inputfd);



	madr = mmap (0, filesize, PROT_READ, MAP_PRIVATE, inputfd, 0);

	if (madr == MAP_FAILED) {

		fprintf (stderr, "mmap error = %d\n", errno);

		close (inputfd);

		exit (4);

	}



	search_pattern ();



	if (munmap (madr, filesize))

		fprintf (stderr, "munmap error = %d\n", errno);



	if (close (inputfd))

		fprintf (stderr, "%s: error %d closing '%s'\n",

				progname, errno, inputname);



	fprintf (stderr, "number of pattern matches = %d\n", num_matches);

	if (num_matches == 0)

		firstloc = ~0;

	printf ("%ld\n", firstloc);

	fprintf (stderr, "%ld\n", firstloc);



	exit (num_matches ? 0 : 2);

}



/* end binoffset.c */

scripts/extract-ikconfig

+44 −83
Original line number Diff line number Diff line 
#!/bin/sh

# extracts .config info from a [b]zImage file

# uses: binoffset (new), dd, zcat, strings, grep

# $arg1 is [b]zImage filename



binoffset="./scripts/binoffset"

test -e $binoffset || cc -o $binoffset ./scripts/binoffset.c || exit 1



IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54"

IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44"

dump_config() {

    file="$1"



    start=`$binoffset $file $IKCFG_ST 2>/dev/null`

    [ "$?" != "0" ] && start="-1"

    if [ "$start" -eq "-1" ]; then

	return

    fi

    end=`$binoffset $file $IKCFG_ED 2>/dev/null`

    [ "$?" != "0" ] && end="-1"

    if [ "$end" -eq "-1" ]; then

	return

    fi



    start=`expr $start + 8`

    size=`expr $end - $start`



    dd if="$file" ibs=1 skip="$start" count="$size" 2>/dev/null | zcat



    clean_up

    exit 0

}





usage()

{

	echo "  usage: extract-ikconfig [b]zImage_filename"

}



clean_up()

# ----------------------------------------------------------------------

# extract-ikconfig - Extract the .config file from a kernel image

#

# This will only work when the kernel was compiled with CONFIG_IKCONFIG.

#

# 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.

#

# (c) 2009, Dick Streefland <dick@streefland.net>

# Licensed under the terms of the GNU General Public License.

# ----------------------------------------------------------------------



gz1='\037\213\010'

gz2='01'

cf1='IKCFG_ST\037\213\010'

cf2='0123456789'



dump_config()

{

	if [ "$TMPFILE" != "" ]; then

		rm -f $TMPFILE

	if	pos=`tr "$cf1\n$cf2" "\n$cf2=" < "$1" | grep -abo "^$cf2"`

	then

		pos=${pos%%:*}

		tail -c+$(($pos+8)) "$1" | zcat -q

		exit 0

	fi

}



if [ $# -lt 1 ]

# Check invocation:

me=${0##*/}

img=$1

if	[ $# -ne 1 -o ! -s "$img" ]

then

	usage

	exit 1

fi



TMPFILE=`mktemp -t ikconfig-XXXXXX` || exit 1

image="$1"



# vmlinux: Attempt to dump the configuration from the file directly

dump_config "$image"



GZHDR1="0x1f 0x8b 0x08 0x00"

GZHDR2="0x1f 0x8b 0x08 0x08"



ELFHDR="0x7f 0x45 0x4c 0x46"



# vmlinux.gz: Check for a compressed images

off=`$binoffset "$image" $GZHDR1 2>/dev/null`

[ "$?" != "0" ] && off="-1"

if [ "$off" -eq "-1" ]; then

	off=`$binoffset "$image" $GZHDR2 2>/dev/null`

	[ "$?" != "0" ] && off="-1"

	echo "Usage: $me <kernel-image>" >&2

	exit 2

fi

if [ "$off" -eq "0" ]; then

	zcat <"$image" >"$TMPFILE"

	dump_config "$TMPFILE"

elif [ "$off" -ne "-1" ]; then

	(dd ibs="$off" skip=1 count=0 && dd bs=512k) <"$image" 2>/dev/null | \

		zcat >"$TMPFILE"

	dump_config "$TMPFILE"



# check if this is simply an ELF file

else

	off=`$binoffset "$image" $ELFHDR 2>/dev/null`

	[ "$?" != "0" ] && off="-1"

	if [ "$off" -eq "0" ]; then

		dump_config "$image"

	fi

fi



echo "ERROR: Unable to extract kernel configuration information."

echo "       This kernel image may not have the config info."



clean_up

# Initial attempt for uncompressed images or objects:

dump_config "$img"



# That didn't work, so decompress and try again:

tmp=/tmp/ikconfig$$

trap "rm -f $tmp" 0

for	pos in `tr "$gz1\n$gz2" "\n$gz2=" < "$img" | grep -abo "^$gz2"`

do

	pos=${pos%%:*}

	tail -c+$pos "$img" | zcat 2> /dev/null > $tmp

	dump_config $tmp

done



# Bail out:

echo "$me: Cannot find kernel config." >&2

exit 1