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Commit 5358db0b authored by Rabin Vincent's avatar Rabin Vincent Committed by Michal Marek
Browse files

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: default avatarRabin Vincent <rabin@rab.in>
Signed-off-by: default avatarMichal Marek <mmarek@suse.cz>
parent 84336466

scripts/decodecode

+35 −13
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ 
# AFLAGS=--32 decodecode < 386.oops



cleanup() {

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

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

	exit 1

}
@@ -39,6 +39,29 @@ fi 
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



	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" "\("`
@@ -49,26 +72,25 @@ if [ $marker -ne 0 ]; then 
	echo All code >> $T.oo

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

	beforemark=`echo "$code"`

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

	echo $beforemark | sed -e 's/ /,0x/g' | sed -e 's/<//g' | sed -e 's/>//g' >> $T.s

	as $AFLAGS -o $T.o $T.s &> /dev/null

	objdump -S $T.o | grep -v "/tmp" | grep -v "Disassembly" | grep -v "\.text" | grep -v "^$" &> $T.ooo

	cat $T.ooo >> $T.oo

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

	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'`

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

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

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

echo $code >> $T.s

as $AFLAGS -o $T.o $T.s &> /dev/null

objdump -S $T.o | grep -v "Disassembly" | grep -v "/tmp" | grep -v "\.text" | grep -v "^$" &> $T.aaa

cat $T.aaa >> $T.aa

disas $T

cat $T.dis >> $T.aa



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

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