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  $T.aaa
  11         exit 1
  12 }
  13
  14 die() {
  15         echo "$@"
  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 $code | sed -e 's/.*Code: //'`
  41
  42 marker=`expr index "$code" "\<"`
  43 if [ $marker -eq 0 ]; then
  44         marker=`expr index "$code" "\("`
  45 fi
  46
  47 touch $T.oo
  48 if [ $marker -ne 0 ]; then
  49         echo All code >> $T.oo
  50         echo ======== >> $T.oo
  51         beforemark=`echo "$code"`
  52         echo -n "       .byte 0x" > $T.s
  53         echo $beforemark | sed -e 's/ /,0x/g' | sed -e 's/<//g' | sed -e 's/>//g' >> $T.s
  54         as $AFLAGS -o $T.o $T.s &> /dev/null
  55         objdump -S $T.o | grep -v "/tmp" | grep -v "Disassembly" | grep -v "\.text" | grep -v "^$" &> $T.ooo
  56         cat $T.ooo >> $T.oo
  57         rm -f $T.o $T.s  $T.ooo
  58
  59 # and fix code at-and-after marker
  60         code=`echo "$code" | cut -c$((${marker} + 1))-`
  61 fi
  62 echo Code starting with the faulting instruction  > $T.aa
  63 echo =========================================== >> $T.aa
  64 code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g'`
  65 echo -n "       .byte 0x" > $T.s
  66 echo $code >> $T.s
  67 as $AFLAGS -o $T.o $T.s &> /dev/null
  68 objdump -S $T.o | grep -v "Disassembly" | grep -v "/tmp" | grep -v "\.text" | grep -v "^$" &> $T.aaa
  69 cat $T.aaa >> $T.aa
  70
  71 faultline=`cat $T.aaa | head -1 | cut -d":" -f2`
  72
  73 cat $T.oo | sed -e "s/\($faultline\)/\*\1     <-- trapping instruction/g"
  74 echo
  75 cat $T.aa
  76 cleanup