xref: /openbmc/linux/scripts/decodecode (revision 95e9fd10) 
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
99