kconfig: simplification of scripts/extract-ikconfig (7b76bfc8) · Commits · 戴 / test

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

Admin message