diff options
Diffstat (limited to 'scripts/extract-ikconfig')
| -rwxr-xr-x | scripts/extract-ikconfig | 87 |
1 files changed, 49 insertions, 38 deletions
diff --git a/scripts/extract-ikconfig b/scripts/extract-ikconfig index 8e526d370966..d9f9f34b22ab 100755 --- a/scripts/extract-ikconfig +++ b/scripts/extract-ikconfig @@ -1,9 +1,31 @@ -#! /bin/bash +#!/bin/sh # extracts .config info from a [b]zImage file # uses: binoffset (new), dd, zcat, strings, grep # $arg1 is [b]zImage filename -TMPFILE="" +binoffset="./scripts/binoffset" + +IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54" +IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44" +function dump_config { + typeset file="$1" + + start=`$binoffset $file $IKCFG_ST 2>/dev/null` + [ "$?" != "0" ] && start="-1" + if [ "$start" -eq "-1" ]; then + return + fi + end=`$binoffset $file $IKCFG_ED 2>/dev/null` + + let start="$start + 8" + let size="$end - $start" + + head --bytes="$end" "$file" | tail --bytes="$size" | zcat + + clean_up + exit 0 +} + usage() { @@ -12,8 +34,7 @@ usage() clean_up() { - if [ -z $ISCOMP ] - then + if [ "$TMPFILE" != "" ]; then rm -f $TMPFILE fi } @@ -21,46 +42,36 @@ clean_up() if [ $# -lt 1 ] then usage - exit + exit 1 fi -image=$1 +TMPFILE="/tmp/ikconfig-$$" +image="$1" -# There are two gzip headers, as well as arches which don't compress their -# kernel. -GZHDR="0x1f 0x8b 0x08 0x00" -if [ `binoffset $image $GZHDR >/dev/null 2>&1 ; echo $?` -ne 0 ] -then - GZHDR="0x1f 0x8b 0x08 0x08" - if [ `binoffset $image $GZHDR >/dev/null 2>&1 ; echo $?` -ne 0 ] - then - ISCOMP=0 - fi -fi +# vmlinux: Attempt to dump the configuration from the file directly +dump_config "$image" -PID=$$ +GZHDR1="0x1f 0x8b 0x08 0x00" +GZHDR2="0x1f 0x8b 0x08 0x08" -# Extract and uncompress the kernel image if necessary -if [ -z $ISCOMP ] -then - TMPFILE="/tmp/`basename $image`.vmlin.$PID" - dd if=$image bs=1 skip=`binoffset $image $GZHDR` 2> /dev/null | zcat > $TMPFILE -else - TMPFILE=$image +# 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 - -# Look for strings. -strings $TMPFILE | grep "CONFIG_BEGIN=n" > /dev/null -if [ $? -eq 0 ] -then - strings $TMPFILE | awk "/CONFIG_BEGIN=n/,/CONFIG_END=n/" > $image.oldconfig.$PID -else - echo "ERROR: Unable to extract kernel configuration information." - echo " This kernel image may not have the config info." - clean_up - exit 1 +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" fi -echo "Kernel configuration written to $image.oldconfig.$PID" +echo "ERROR: Unable to extract kernel configuration information." +echo " This kernel image may not have the config info." + clean_up -exit 0 +exit 1 |