linux/scripts/decodecode at master · snits/linux · GitHub

History

executable file

105 lines (85 loc) · 2.18 KB

Raw

100

101

102

103

104

105

#!/bin/sh

# SPDX-License-Identifier: GPL-2.0

# Disassemble the Code: line in Linux oopses

# usage: decodecode < oops.file

# options: set env. variable AFLAGS=options to pass options to "as";

# e.g., to decode an i386 oops on an x86_64 system, use:

# AFLAGS=--32 decodecode < 386.oops

cleanup() {

rm -f $T $T.s $T.o $T.oo $T.aa $T.dis

exit 1

}

die() {

echo "$@"

exit 1

}

trap cleanup EXIT

T=`mktemp` || die "cannot create temp file"

code=

while read i ; do

case "$i" in

*Code:*)

code=$i

;;

esac

done

if [ -z "$code" ]; then

rm $T

exit

echo $code

code=`echo $code | sed -e 's/.*Code: //'`

width=`expr index "$code" ' '`

width=$((($width-1)/2))

case $width in

1) type=byte ;;

2) type=2byte ;;

4) type=4byte ;;

esac

disas() {

${CROSS_COMPILE}as $AFLAGS -o $1.o $1.s > /dev/null 2>&1

if [ "$ARCH" = "arm" ]; then

if [ $width -eq 2 ]; then

OBJDUMPFLAGS="-M force-thumb"

${CROSS_COMPILE}strip $1.o

${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $1.o | \

grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1

}

marker=`expr index "$code" "\<"`

if [ $marker -eq 0 ]; then

marker=`expr index "$code" "\("`

touch $T.oo

if [ $marker -ne 0 ]; then

echo All code >> $T.oo

echo ======== >> $T.oo

beforemark=`echo "$code"`

echo -n " .$type 0x" > $T.s

echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s

disas $T

cat $T.dis >> $T.oo

rm -f $T.o $T.s $T.dis

# and fix code at-and-after marker

code=`echo "$code" | cut -c$((${marker} + 1))-`

echo Code starting with the faulting instruction > $T.aa

echo =========================================== >> $T.aa

code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'`

echo -n " .$type 0x" > $T.s

echo $code >> $T.s

disas $T

cat $T.dis >> $T.aa

# (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3,

# i.e. the title + the "===..=" line (sed is counting from 1, 0 address is

# special)

faultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \

$(wc -l $T.aa | cut -d" " -f1) + 3))

faultline=`cat $T.dis | head -1 | cut -d":" -f2-`

faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'`

cat $T.oo | sed -e "${faultlinenum}s/^$.*:$$.*$/\1\*\2\t\t<-- trapping instruction/"

echo

cat $T.aa

cleanup

linux/scripts/decodecode at master · snits/linux · GitHub

Expand file tree

Breadcrumbs

decodecode

Latest commit

History

Breadcrumbs

decodecode

File metadata and controls