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 10 cleanup() { 11 rm -f $T $T.s $T.o $T.oo $T.aa $T.dis 12 exit 1 13 } 14 15 die() { 16 echo "$@" 17 exit 1 18 } 19 20 trap cleanup EXIT 21 22 T=`mktemp` || die "cannot create temp file" 23 code= 24 cont= 25 26 while read i ; do 27 28 case "$i" in 29 *Code:*) 30 code=$i 31 cont=yes 32 ;; 33 *) 34 [ -n "$cont" ] && { 35 xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')" 36 if [ -n "$xdump" ]; then 37 code="$code $xdump" 38 else 39 cont= 40 fi 41 } 42 ;; 43 esac 44 45 done 46 47 if [ -z "$code" ]; then 48 rm $T 49 exit 50 fi 51 52 echo $code 53 code=`echo $code | sed -e 's/.*Code: //'` 54 55 width=`expr index "$code" ' '` 56 width=$((($width-1)/2)) 57 case $width in 58 1) type=byte ;; 59 2) type=2byte ;; 60 4) type=4byte ;; 61 esac 62 63 disas() { 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 $1.o | \ 83 grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1 84 } 85 86 marker=`expr index "$code" "\<"` 87 if [ $marker -eq 0 ]; then 88 marker=`expr index "$code" "\("` 89 fi 90 91 touch $T.oo 92 if [ $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))-` 104 fi 105 echo Code starting with the faulting instruction > $T.aa 106 echo =========================================== >> $T.aa 107 code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'` 108 echo -n " .$type 0x" > $T.s 109 echo $code >> $T.s 110 disas $T 111 cat $T.dis >> $T.aa 112 113 # (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3, 114 # i.e. the title + the "===..=" line (sed is counting from 1, 0 address is 115 # special) 116 faultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \ 117 $(wc -l $T.aa | cut -d" " -f1) + 3)) 118 119 faultline=`cat $T.dis | head -1 | cut -d":" -f2-` 120 faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'` 121 122 cat $T.oo | sed -e "${faultlinenum}s/^\(.*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/" 123 echo 124 cat $T.aa 125 cleanup 126