scripts/decodecode

   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
   9 cleanup() {
  10         rm -f $T $T.s $T.o $T.oo $T.aa $T.dis
  11         exit 1
  12 }
  13
  14 die() {
  15         echo "$@"
  16         exit 1
  17 }
  18
  19 trap cleanup EXIT
  20
  21 T=`mktemp` || die "cannot create temp file"
  22 code=
  23
  24 while read i ; do
  25
  26 case "$i" in
  27 *Code:*)
  28         code=$i
  29         ;;
  30 esac
  31
  32 done
  33
  34 if [ -z "$code" ]; then
  35         rm $T
  36         exit
  37 fi
  38
  39 echo $code
  40 code=`echo $code | sed -e 's/.*Code: //'`
  41
  42 width=`expr index "$code" ' '`
  43 width=$[($width-1)/2]
  44 case $width in
  45 1) type=byte ;;
  46 2) type=2byte ;;
  47 4) type=4byte ;;
  48 esac
  49
  50 disas() {
  51         ${CROSS_COMPILE}as $AFLAGS -o $1.o $1.s &> /dev/null
  52
  53         if [ "$ARCH" == "arm" ]; then
  54                 if [ $width == 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 $1.o | \
  62                 grep -v "/tmp\|Disassembly\|\.text\|^$" &> $1.dis
  63 }
  64
  65 marker=`expr index "$code" "\<"`
  66 if [ $marker -eq 0 ]; then
  67         marker=`expr index "$code" "\("`
  68 fi
  69
  70 touch $T.oo
  71 if [ $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))-`
  83 fi
  84 echo Code starting with the faulting instruction  > $T.aa
  85 echo =========================================== >> $T.aa
  86 code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'`
  87 echo -n "       .$type 0x" > $T.s
  88 echo $code >> $T.s
  89 disas $T
  90 cat $T.dis >> $T.aa
  91
  92 faultline=`cat $T.dis | head -1 | cut -d":" -f2`
  93 faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'`
  94
  95 cat $T.oo | sed -e "s/\($faultline\)/\*\1     <-- trapping instruction/g"
  96 echo
  97 cat $T.aa
  98 cleanup