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Rabin Vincent 5358db0b0e scripts: add ARM support to decodecode

This patch adds support for decoding ARM oopses to scripts/decodecode.
The following things are handled:

 - ARCH and CROSS_COMPILE environment variables are respected.

 - The Code: in x86 oopses is in bytes, while it is in either words (4
   bytes) or halfwords for ARM.

 - Some versions of ARM objdump refuse to disassemble instructions
   generated by literal constants (".word 0x...").  The workaround is to
   strip the object file first.

 - The faulting instruction is marked (liked so) in ARM, but <like so>
   in x86.

 - ARM mnemonics may include characters such as [] which need to be
   escaped before being passed to sed for the "<- trapping instruction"
   substitution.

Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Michal Marek <mmarek@suse.cz>

2010-02-02 14:33:54 +01:00

1.9 KiB

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#!/bin/sh

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 fi

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

width=expr index "$code" ' ' width=$[($width-1)/2] case $width in

type=byte ;;
type=2byte ;;
type=4byte ;; esac

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

if [ "$ARCH" == "arm" ]; then
	if [ $width == 2 ]; then
		OBJDUMPFLAGS="-M force-thumb"
	fi

	${CROSS_COMPILE}strip $1.o
fi

${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $1.o | \
	grep -v "/tmp\|Disassembly\|\.text\|^$" &> $1.dis

}

marker=expr index "$code" "\<" if [ $marker -eq 0 ]; then marker=expr index "$code" "\(" fi

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))-`

fi 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

faultline=cat $T.dis | head -1 | cut -d":" -f2 faultline=echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'

cat $T.oo | sed -e "s/($faultline)/*\1 <-- trapping instruction/g" echo cat $T.aa cleanup

1.9 KiB Executable File Raw Blame History