1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3# Disassemble the Code: line in Linux oopses 4# usage: decodecode < oops.file 5# 6# options: set env. variable AFLAGS=options to pass options to "as"; 7# e.g., to decode an i386 oops on an x86_64 system, use: 8# AFLAGS=--32 decodecode < 386.oops 9 10cleanup() { 11 rm -f $T $T.s $T.o $T.oo $T.aa $T.dis 12 exit 1 13} 14 15die() { 16 echo "$@" 17 exit 1 18} 19 20trap cleanup EXIT 21 22T=`mktemp` || die "cannot create temp file" 23code= 24cont= 25 26while read i ; do 27 28case "$i" in 29*Code:*) 30 code=$i 31 cont=yes 32 ;; 33*) 34 [ -n "$cont" ] && { 35 xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')" 36 if [ -n "$xdump" ]; then 37 code="$code $xdump" 38 else 39 cont= 40 fi 41 } 42 ;; 43esac 44 45done 46 47if [ -z "$code" ]; then 48 rm $T 49 exit 50fi 51 52echo $code 53code=`echo $code | sed -e 's/.*Code: //'` 54 55width=`expr index "$code" ' '` 56width=$((($width-1)/2)) 57case $width in 581) type=byte ;; 592) type=2byte ;; 604) type=4byte ;; 61esac 62 63disas() { 64 ${CROSS_COMPILE}as $AFLAGS -o $1.o $1.s > /dev/null 2>&1 65 66 if [ "$ARCH" = "arm" ]; then 67 if [ $width -eq 2 ]; then 68 OBJDUMPFLAGS="-M force-thumb" 69 fi 70 71 ${CROSS_COMPILE}strip $1.o 72 fi 73 74 if [ "$ARCH" = "arm64" ]; then 75 if [ $width -eq 4 ]; then 76 type=inst 77 fi 78 79 ${CROSS_COMPILE}strip $1.o 80 fi 81 82 ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $1.o | \ 83 grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1 84} 85 86marker=`expr index "$code" "\<"` 87if [ $marker -eq 0 ]; then 88 marker=`expr index "$code" "\("` 89fi 90 91touch $T.oo 92if [ $marker -ne 0 ]; then 93 echo All code >> $T.oo 94 echo ======== >> $T.oo 95 beforemark=`echo "$code"` 96 echo -n " .$type 0x" > $T.s 97 echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s 98 disas $T 99 cat $T.dis >> $T.oo 100 rm -f $T.o $T.s $T.dis 101 102# and fix code at-and-after marker 103 code=`echo "$code" | cut -c$((${marker} + 1))-` 104fi 105echo Code starting with the faulting instruction > $T.aa 106echo =========================================== >> $T.aa 107code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'` 108echo -n " .$type 0x" > $T.s 109echo $code >> $T.s 110disas $T 111cat $T.dis >> $T.aa 112 113# (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3, 114# i.e. the title + the "===..=" line (sed is counting from 1, 0 address is 115# special) 116faultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \ 117 $(wc -l $T.aa | cut -d" " -f1) + 3)) 118 119faultline=`cat $T.dis | head -1 | cut -d":" -f2-` 120faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'` 121 122cat $T.oo | sed -e "${faultlinenum}s/^\(.*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/" 123echo 124cat $T.aa 125cleanup 126