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 $T.dis
11	exit 1
12}
13
14die() {
15	echo "$@"
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 $code | sed -e 's/.*Code: //'`
41
42width=`expr index "$code" ' '`
43width=$((($width-1)/2))
44case $width in
451) type=byte ;;
462) type=2byte ;;
474) type=4byte ;;
48esac
49
 
 
 
 
 
 
 
50disas() {
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 $1.o | \
62		grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1
63}
64
65marker=`expr index "$code" "\<"`
66if [ $marker -eq 0 ]; then
67	marker=`expr index "$code" "\("`
68fi
69
70touch $T.oo
71if [ $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))-`
83fi
84echo Code starting with the faulting instruction  > $T.aa
85echo =========================================== >> $T.aa
86code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'`
87echo -n "	.$type 0x" > $T.s
88echo $code >> $T.s
89disas $T
90cat $T.dis >> $T.aa
91
92faultline=`cat $T.dis | head -1 | cut -d":" -f2`
 
 
 
 
 
 
93faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'`
94
95cat $T.oo | sed -e "s/\($faultline\)/\*\1     <-- trapping instruction/g"
96echo
97cat $T.aa
98cleanup

  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