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Merge tag 'io_uring-5.7-2020-05-22' of git://git.kernel.dk/linux-block
[thirdparty/linux.git] / scripts / decodecode
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 cont=
25
26 while read i ; do
27
28 case "$i" in
29 *Code:*)
30 code=$i
31 cont=yes
32 ;;
33 *)
34 [ -n "$cont" ] && {
35 xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')"
36 if [ -n "$xdump" ]; then
37 code="$code $xdump"
38 else
39 cont=
40 fi
41 }
42 ;;
43 esac
44
45 done
46
47 if [ -z "$code" ]; then
48 rm $T
49 exit
50 fi
51
52 echo $code
53 code=`echo $code | sed -e 's/.*Code: //'`
54
55 width=`expr index "$code" ' '`
56 width=$((($width-1)/2))
57 case $width in
58 1) type=byte ;;
59 2) type=2byte ;;
60 4) type=4byte ;;
61 esac
62
63 if [ -z "$ARCH" ]; then
64 case `uname -m` in
65 aarch64*) ARCH=arm64 ;;
66 arm*) ARCH=arm ;;
67 esac
68 fi
69
70 disas() {
71 ${CROSS_COMPILE}as $AFLAGS -o $1.o $1.s > /dev/null 2>&1
72
73 if [ "$ARCH" = "arm" ]; then
74 if [ $width -eq 2 ]; then
75 OBJDUMPFLAGS="-M force-thumb"
76 fi
77
78 ${CROSS_COMPILE}strip $1.o
79 fi
80
81 if [ "$ARCH" = "arm64" ]; then
82 if [ $width -eq 4 ]; then
83 type=inst
84 fi
85
86 ${CROSS_COMPILE}strip $1.o
87 fi
88
89 ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $1.o | \
90 grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1
91 }
92
93 marker=`expr index "$code" "\<"`
94 if [ $marker -eq 0 ]; then
95 marker=`expr index "$code" "\("`
96 fi
97
98 touch $T.oo
99 if [ $marker -ne 0 ]; then
100 echo All code >> $T.oo
101 echo ======== >> $T.oo
102 beforemark=`echo "$code"`
103 echo -n " .$type 0x" > $T.s
104 echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s
105 disas $T
106 cat $T.dis >> $T.oo
107 rm -f $T.o $T.s $T.dis
108
109 # and fix code at-and-after marker
110 code=`echo "$code" | cut -c$((${marker} + 1))-`
111 fi
112 echo Code starting with the faulting instruction > $T.aa
113 echo =========================================== >> $T.aa
114 code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'`
115 echo -n " .$type 0x" > $T.s
116 echo $code >> $T.s
117 disas $T
118 cat $T.dis >> $T.aa
119
120 # (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3,
121 # i.e. the title + the "===..=" line (sed is counting from 1, 0 address is
122 # special)
123 faultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \
124 $(wc -l $T.aa | cut -d" " -f1) + 3))
125
126 faultline=`cat $T.dis | head -1 | cut -d":" -f2-`
127 faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'`
128
129 cat $T.oo | sed -e "${faultlinenum}s/^\([^:]*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/"
130 echo
131 cat $T.aa
132 cleanup