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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
10cleanup() {
11 rm -f $T $T.s $T.o $T.oo $T.aa $T.dis
12 exit 1
13}
14
15die() {
16 echo "$@"
17 exit 1
18}
19
20trap cleanup EXIT
21
22T=`mktemp` || die "cannot create temp file"
23code=
24cont=
25
26while read i ; do
27
28case "$i" in
29*Code:*)
30 code=$i
31 cont=yes
32 ;;
33*)
34 [ -n "$cont" ] && {
35 xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')"
36 if [ -n "$xdump" ]; then
37 code="$code $xdump"
38 else
39 cont=
40 fi
41 }
42 ;;
43esac
44
45done
46
47if [ -z "$code" ]; then
48 rm $T
49 exit
50fi
51
52echo $code
53code=`echo $code | sed -e 's/.*Code: //'`
54
55width=`expr index "$code" ' '`
56width=$((($width-1)/2))
57case $width in
581) type=byte ;;
592) type=2byte ;;
604) type=4byte ;;
61esac
62
63if [ -z "$ARCH" ]; then
64 case `uname -m` in
65 aarch64*) ARCH=arm64 ;;
66 arm*) ARCH=arm ;;
67 esac
68fi
69
70disas() {
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 $1.o | \
90 grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1
91}
92
93marker=`expr index "$code" "\<"`
94if [ $marker -eq 0 ]; then
95 marker=`expr index "$code" "\("`
96fi
97
98touch $T.oo
99if [ $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))-`
111fi
112echo Code starting with the faulting instruction > $T.aa
113echo =========================================== >> $T.aa
114code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'`
115echo -n " .$type 0x" > $T.s
116echo $code >> $T.s
117disas $T
118cat $T.dis >> $T.aa
119
120# (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3,
121# i.e. the title + the "===..=" line (sed is counting from 1, 0 address is
122# special)
123faultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \
124 $(wc -l $T.aa | cut -d" " -f1) + 3))
125
126faultline=`cat $T.dis | head -1 | cut -d":" -f2-`
127faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'`
128
129cat $T.oo | sed -e "${faultlinenum}s/^\(.*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/"
130echo
131cat $T.aa
132cleanup
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# PC=hex - the PC (program counter) the oops points to
10
11cleanup() {
12 rm -f $T $T.s $T.o $T.oo $T.aa $T.dis
13 exit 1
14}
15
16die() {
17 echo "$@"
18 exit 1
19}
20
21trap cleanup EXIT
22
23T=`mktemp` || die "cannot create temp file"
24code=
25cont=
26
27while read i ; do
28
29case "$i" in
30*Code:*)
31 code=$i
32 cont=yes
33 ;;
34*)
35 [ -n "$cont" ] && {
36 xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')"
37 if [ -n "$xdump" ]; then
38 code="$code $xdump"
39 else
40 cont=
41 fi
42 }
43 ;;
44esac
45
46done
47
48if [ -z "$code" ]; then
49 rm $T
50 exit
51fi
52
53echo $code
54code=`echo $code | sed -e 's/.*Code: //'`
55
56width=`expr index "$code" ' '`
57width=$((($width-1)/2))
58case $width in
591) type=byte ;;
602) type=2byte ;;
614) type=4byte ;;
62esac
63
64if [ -z "$ARCH" ]; then
65 case `uname -m` in
66 aarch64*) ARCH=arm64 ;;
67 arm*) ARCH=arm ;;
68 esac
69fi
70
71# Params: (tmp_file, pc_sub)
72disas() {
73 t=$1
74 pc_sub=$2
75
76 ${CROSS_COMPILE}as $AFLAGS -o $t.o $t.s > /dev/null 2>&1
77
78 if [ "$ARCH" = "arm" ]; then
79 if [ $width -eq 2 ]; then
80 OBJDUMPFLAGS="-M force-thumb"
81 fi
82
83 ${CROSS_COMPILE}strip $t.o
84 fi
85
86 if [ "$ARCH" = "arm64" ]; then
87 if [ $width -eq 4 ]; then
88 type=inst
89 fi
90
91 ${CROSS_COMPILE}strip $t.o
92 fi
93
94 if [ $pc_sub -ne 0 ]; then
95 if [ $PC ]; then
96 adj_vma=$(( $PC - $pc_sub ))
97 OBJDUMPFLAGS="$OBJDUMPFLAGS --adjust-vma=$adj_vma"
98 fi
99 fi
100
101 ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $t.o | \
102 grep -v "/tmp\|Disassembly\|\.text\|^$" > $t.dis 2>&1
103}
104
105marker=`expr index "$code" "\<"`
106if [ $marker -eq 0 ]; then
107 marker=`expr index "$code" "\("`
108fi
109
110
111touch $T.oo
112if [ $marker -ne 0 ]; then
113 # 2 opcode bytes and a single space
114 pc_sub=$(( $marker / 3 ))
115 echo All code >> $T.oo
116 echo ======== >> $T.oo
117 beforemark=`echo "$code"`
118 echo -n " .$type 0x" > $T.s
119 echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s
120 disas $T $pc_sub
121 cat $T.dis >> $T.oo
122 rm -f $T.o $T.s $T.dis
123
124# and fix code at-and-after marker
125 code=`echo "$code" | cut -c$((${marker} + 1))-`
126fi
127echo Code starting with the faulting instruction > $T.aa
128echo =========================================== >> $T.aa
129code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'`
130echo -n " .$type 0x" > $T.s
131echo $code >> $T.s
132disas $T 0
133cat $T.dis >> $T.aa
134
135# (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3,
136# i.e. the title + the "===..=" line (sed is counting from 1, 0 address is
137# special)
138faultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \
139 $(wc -l $T.aa | cut -d" " -f1) + 3))
140
141faultline=`cat $T.dis | head -1 | cut -d":" -f2-`
142faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'`
143
144cat $T.oo | sed -e "${faultlinenum}s/^\([^:]*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/"
145echo
146cat $T.aa
147cleanup