decodecode

#!/bin/sh
# Disassemble the Code: line in Linux oopses
# usage: decodecode < oops.file
#
# options: set env. variable AFLAGS=options to pass options to "as";
# e.g., to decode an i386 oops on an x86_64 system, use:
# AFLAGS=--32 decodecode < 386.oops

cleanup() {
	rm -f $T $T.s $T.o
	exit 1
}

die() {
	echo "$@"
	exit 1
}

trap cleanup EXIT

T=`mktemp` || die "cannot create temp file"
code=

while read i ; do

case "$i" in
*Code:*)
	code=$i
	;;
esac

done

if [ -z "$code" ]; then
	rm $T
	exit
fi

echo $code
code=`echo $code | sed -e 's/.*Code: //'`

marker=`expr index "$code" "\<"`
if [ $marker -eq 0 ]; then
	marker=`expr index "$code" "\("`
fi

if [ $marker -ne 0 ]; then
	beforemark=`echo "$code" | cut -c-$((${marker} - 1))`
	echo -n "	.byte 0x" > $T.s
	echo $beforemark | sed -e 's/ /,0x/g' >> $T.s
	as $AFLAGS -o $T.o $T.s
	objdump -S $T.o
	rm $T.o $T.s

# and fix code at-and-after marker
	code=`echo "$code" | cut -c$((${marker} + 1))-`
fi

code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g'`
echo -n "	.byte 0x" > $T.s
echo $code >> $T.s
as $AFLAGS -o $T.o $T.s
objdump -S $T.o
rm $T $T.s $T.o