#!/bin/sh# SPDX-License-Identifier: GPL-2.0# 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# PC=hex - the PC (program counter) the oops points to cleanup() {	rm -f $T $T.s $T.o $T.oo $T.aa $T.dis	exit 1} die() {	echo "$@"	exit 1} trap cleanup EXIT T=`mktemp` || die "cannot create temp file"code=cont= while read i ; do case "$i" in*Code:*)	code=$i	cont=yes	;;*)	[ -n "$cont" ] && {		xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')"		if [ -n "$xdump" ]; then			code="$code $xdump"		else			cont=		fi	}	;;esac done if [ -z "$code" ]; then	rm $T	exitfi echo $codecode=`echo $code | sed -e 's/.*Code: //'` width=`expr index "$code" ' '`width=$((($width-1)/2))case $width in1) type=byte ;;2) type=2byte ;;4) type=4byte ;;esac if [ -z "$ARCH" ]; then    case `uname -m` in	aarch64*) ARCH=arm64 ;;	arm*) ARCH=arm ;;    esacfi # Params: (tmp_file, pc_sub)disas() {	t=$1	pc_sub=$2 	${CROSS_COMPILE}as $AFLAGS -o $t.o $t.s > /dev/null 2>&1 	if [ "$ARCH" = "arm" ]; then		if [ $width -eq 2 ]; then			OBJDUMPFLAGS="-M force-thumb"		fi 		${CROSS_COMPILE}strip $t.o	fi 	if [ "$ARCH" = "arm64" ]; then		if [ $width -eq 4 ]; then			type=inst		fi 		${CROSS_COMPILE}strip $t.o	fi 	if [ $pc_sub -ne 0 ]; then		if [ $PC ]; then			adj_vma=$(( $PC - $pc_sub ))			OBJDUMPFLAGS="$OBJDUMPFLAGS --adjust-vma=$adj_vma"		fi	fi 	${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $t.o | \		grep -v "/tmp\|Disassembly\|\.text\|^$" > $t.dis 2>&1} marker=`expr index "$code" "\<"`if [ $marker -eq 0 ]; then	marker=`expr index "$code" "\("`fi  touch $T.ooif [ $marker -ne 0 ]; then	# 2 opcode bytes and a single space	pc_sub=$(( $marker / 3 ))	echo All code >> $T.oo	echo ======== >> $T.oo	beforemark=`echo "$code"`	echo -n "	.$type 0x" > $T.s	echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s	disas $T $pc_sub	cat $T.dis >> $T.oo	rm -f $T.o $T.s $T.dis # and fix code at-and-after marker	code=`echo "$code" | cut -c$((${marker} + 1))-`fiecho Code starting with the faulting instruction  > $T.aaecho =========================================== >> $T.aacode=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'`echo -n "	.$type 0x" > $T.secho $code >> $T.sdisas $T 0cat $T.dis >> $T.aa # (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3,# i.e. the title + the "===..=" line (sed is counting from 1, 0 address is# special)faultlinenum=$(( $(wc -l $T.oo  | cut -d" " -f1) - \		 $(wc -l $T.aa  | cut -d" " -f1) + 3)) faultline=`cat $T.dis | head -1 | cut -d":" -f2-`faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'` cat $T.oo | sed -e "${faultlinenum}s/^\([^:]*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/"echocat $T.aacleanup