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authorDick Streefland <dick@streefland.net>2009-10-06 22:35:40 +0200
committerSteven Rostedt <rostedt@goodmis.org>2009-10-07 11:44:18 -0400
commit7b76bfc86757ca5e7b0a62f50003752da77c115b (patch)
treea71a191c73f9b5364f161a01eb7f61ef62a51515
parent0eca52a92735f43462165efe00a7e394345fb38e (diff)
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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: Dick Streefland <dick@streefland.net> LKML-Reference: <20091006203540.GA14634@streefland.net> Tested-by: Steven Rostedt <rostedt@goodmis.org> Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-rw-r--r--Documentation/dontdiff1
-rw-r--r--scripts/.gitignore1
-rw-r--r--scripts/binoffset.c163
-rwxr-xr-xscripts/extract-ikconfig127
4 files changed, 44 insertions, 248 deletions
diff --git a/Documentation/dontdiff b/Documentation/dontdiff
index e1efc400bed6..bc01a5a9d663 100644
--- a/Documentation/dontdiff
+++ b/Documentation/dontdiff
@@ -68,7 +68,6 @@ autoconf.h*
bbootsect
bin2c
binkernel.spec
-binoffset
bootsect
bounds.h
bsetup
diff --git a/scripts/.gitignore b/scripts/.gitignore
index 52cab46ae35a..c5d5db54c009 100644
--- a/scripts/.gitignore
+++ b/scripts/.gitignore
@@ -6,5 +6,4 @@ kallsyms
pnmtologo
bin2c
unifdef
-binoffset
ihex2fw
diff --git a/scripts/binoffset.c b/scripts/binoffset.c
deleted file mode 100644
index 1a2e39b8e3e5..000000000000
--- a/scripts/binoffset.c
+++ /dev/null
@@ -1,163 +0,0 @@
-/***************************************************************************
- * 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 */
diff --git a/scripts/extract-ikconfig b/scripts/extract-ikconfig
index de233ff43c1c..37f30d36c944 100755
--- a/scripts/extract-ikconfig
+++ b/scripts/extract-ikconfig
@@ -1,92 +1,53 @@
#!/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
+ echo "Usage: $me <kernel-image>" >&2
+ exit 2
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"
-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