LXR linux/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
   9cleanup() {
  10        rm -f $T $T.s $T.o $T.oo $T.aa  $T.aaa
  11        exit 1
  12}
  13
  14die() {
  15        echo "$@"
  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 $code | sed -e 's/.*Code: //'`
  41
  42marker=`expr index "$code" "\<"`
  43if [ $marker -eq 0 ]; then
  44        marker=`expr index "$code" "\("`
  45fi
  46
  47touch $T.oo
  48if [ $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))-`
  61fi
  62echo Code starting with the faulting instruction  > $T.aa
  63echo =========================================== >> $T.aa
  64code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g'`
  65echo -n "       .byte 0x" > $T.s
  66echo $code >> $T.s
  67as $AFLAGS -o $T.o $T.s &> /dev/null
  68objdump -S $T.o | grep -v "Disassembly" | grep -v "/tmp" | grep -v "\.text" | grep -v "^$" &> $T.aaa
  69cat $T.aaa >> $T.aa
  70
  71faultline=`cat $T.aaa | head -1 | cut -d":" -f2`
  72
  73cat $T.oo | sed -e "s/\($faultline\)/\*\1     <-- trapping instruction/g"
  74echo
  75cat $T.aa
  76cleanup
  77