Root/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

Archive Download this file



interactive