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1 | #!/bin/sh | |
2 | # SPDX-License-Identifier: GPL-2.0 | |
3 | # Disassemble the Code: line in Linux oopses | |
4 | # usage: decodecode < oops.file | |
5 | # | |
6 | # options: set env. variable AFLAGS=options to pass options to "as"; | |
7 | # e.g., to decode an i386 oops on an x86_64 system, use: | |
8 | # AFLAGS=--32 decodecode < 386.oops | |
9 | ||
10 | cleanup() { | |
11 | rm -f $T $T.s $T.o $T.oo $T.aa $T.dis | |
12 | exit 1 | |
13 | } | |
14 | ||
15 | die() { | |
16 | echo "$@" | |
17 | exit 1 | |
18 | } | |
19 | ||
20 | trap cleanup EXIT | |
21 | ||
22 | T=`mktemp` || die "cannot create temp file" | |
23 | code= | |
24 | ||
25 | while read i ; do | |
26 | ||
27 | case "$i" in | |
28 | *Code:*) | |
29 | code=$i | |
30 | ;; | |
31 | esac | |
32 | ||
33 | done | |
34 | ||
35 | if [ -z "$code" ]; then | |
36 | rm $T | |
37 | exit | |
38 | fi | |
39 | ||
40 | echo $code | |
41 | code=`echo $code | sed -e 's/.*Code: //'` | |
42 | ||
43 | width=`expr index "$code" ' '` | |
44 | width=$((($width-1)/2)) | |
45 | case $width in | |
46 | 1) type=byte ;; | |
47 | 2) type=2byte ;; | |
48 | 4) type=4byte ;; | |
49 | esac | |
50 | ||
51 | disas() { | |
52 | ${CROSS_COMPILE}as $AFLAGS -o $1.o $1.s > /dev/null 2>&1 | |
53 | ||
54 | if [ "$ARCH" = "arm" ]; then | |
55 | if [ $width -eq 2 ]; then | |
56 | OBJDUMPFLAGS="-M force-thumb" | |
57 | fi | |
58 | ||
59 | ${CROSS_COMPILE}strip $1.o | |
60 | fi | |
61 | ||
62 | if [ "$ARCH" = "arm64" ]; then | |
63 | if [ $width -eq 4 ]; then | |
64 | type=inst | |
65 | fi | |
66 | ||
67 | ${CROSS_COMPILE}strip $1.o | |
68 | fi | |
69 | ||
70 | ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $1.o | \ | |
71 | grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1 | |
72 | } | |
73 | ||
74 | marker=`expr index "$code" "\<"` | |
75 | if [ $marker -eq 0 ]; then | |
76 | marker=`expr index "$code" "\("` | |
77 | fi | |
78 | ||
79 | touch $T.oo | |
80 | if [ $marker -ne 0 ]; then | |
81 | echo All code >> $T.oo | |
82 | echo ======== >> $T.oo | |
83 | beforemark=`echo "$code"` | |
84 | echo -n " .$type 0x" > $T.s | |
85 | echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s | |
86 | disas $T | |
87 | cat $T.dis >> $T.oo | |
88 | rm -f $T.o $T.s $T.dis | |
89 | ||
90 | # and fix code at-and-after marker | |
91 | code=`echo "$code" | cut -c$((${marker} + 1))-` | |
92 | fi | |
93 | echo Code starting with the faulting instruction > $T.aa | |
94 | echo =========================================== >> $T.aa | |
95 | code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'` | |
96 | echo -n " .$type 0x" > $T.s | |
97 | echo $code >> $T.s | |
98 | disas $T | |
99 | cat $T.dis >> $T.aa | |
100 | ||
101 | # (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3, | |
102 | # i.e. the title + the "===..=" line (sed is counting from 1, 0 address is | |
103 | # special) | |
104 | faultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \ | |
105 | $(wc -l $T.aa | cut -d" " -f1) + 3)) | |
106 | ||
107 | faultline=`cat $T.dis | head -1 | cut -d":" -f2-` | |
108 | faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'` | |
109 | ||
110 | cat $T.oo | sed -e "${faultlinenum}s/^\(.*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/" | |
111 | echo | |
112 | cat $T.aa | |
113 | cleanup |