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 $T.dis
  11        exit 1
  12}
  13
  14die() {
  15        echo "$@"
  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
  92faultline=`cat $T.dis | head -1 | cut -d":" -f2`
  93faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'`
  94
  95cat $T.oo | sed -e "s/\($faultline\)/\*\1     <-- trapping instruction/g"
  96echo
  97cat $T.aa
  98cleanup
  99