decodecode

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    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 $1.s > /dev/null 2>&1
   52 
   53         if [ "$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 $1.o | \
   62                 grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1
   63 }
   64 
   65 marker=`expr index "$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

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FreeBSD/Linux Kernel Cross Reference sys/scripts/decodecode

FreeBSD/Linux Kernel Cross Reference
sys/scripts/decodecode