1#!/bin/sh 2# Disassemble the Code: line in Linux oopses 3# usage: decodecode < oops.file 4# 5# options: set env. variable AFLAGS=options to pass options to "as"; 6# e.g., to decode an i386 oops on an x86_64 system, use: 7# AFLAGS=--32 decodecode < 386.oops 8 9cleanup() { 10 rm -f $T $T.s $T.o $T.oo $T.aa $T.dis 11 exit 1 12} 13 14die() { 15 echo "$@" 16 exit 1 17} 18 19trap cleanup EXIT 20 21T=`mktemp` || die "cannot create temp file" 22code= 23 24while read i ; do 25 26case "$i" in 27*Code:*) 28 code=$i 29 ;; 30esac 31 32done 33 34if [ -z "$code" ]; then 35 rm $T 36 exit 37fi 38 39echo $code 40code=`echo $code | sed -e 's/.*Code: //'` 41 42width=`expr index "$code" ' '` 43width=$((($width-1)/2)) 44case $width in 451) type=byte ;; 462) type=2byte ;; 474) type=4byte ;; 48esac 49 50disas() { 51 ${CROSS_COMPILE}as $AFLAGS -o $1.o $1.s > /dev/null 2>&1 52 53 if [ "$ARCH" = "arm" ]; then 54 if [ $width -eq 2 ]; then 55 OBJDUMPFLAGS="-M force-thumb" 56 fi 57 58 ${CROSS_COMPILE}strip $1.o 59 fi 60 61 ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $1.o | \ 62 grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1 63} 64 65marker=`expr index "$code" "\<"` 66if [ $marker -eq 0 ]; then 67 marker=`expr index "$code" "\("` 68fi 69 70touch $T.oo 71if [ $marker -ne 0 ]; then 72 echo All code >> $T.oo 73 echo ======== >> $T.oo 74 beforemark=`echo "$code"` 75 echo -n " .$type 0x" > $T.s 76 echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s 77 disas $T 78 cat $T.dis >> $T.oo 79 rm -f $T.o $T.s $T.dis 80 81# and fix code at-and-after marker 82 code=`echo "$code" | cut -c$((${marker} + 1))-` 83fi 84echo Code starting with the faulting instruction > $T.aa 85echo =========================================== >> $T.aa 86code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'` 87echo -n " .$type 0x" > $T.s 88echo $code >> $T.s 89disas $T 90cat $T.dis >> $T.aa 91 92# (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3, 93# i.e. the title + the "===..=" line (sed is counting from 1, 0 address is 94# special) 95faultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \ 96 $(wc -l $T.aa | cut -d" " -f1) + 3)) 97 98faultline=`cat $T.dis | head -1 | cut -d":" -f2-` 99faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'` 100 101cat $T.oo | sed -e "${faultlinenum}s/^\(.*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/" 102echo 103cat $T.aa 104cleanup 105