Commit 846442c8 authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Sam Ravnborg
Browse files

scripts: improve the decodecode script 



kerneloops.org has been using an improved "decodecode" script,
specifically it has a special marker that shows which line in the assembly
the oops happened at, like this:

  20:	83 e0 03             	and    $0x3,%eax
  23:	09 d8                	or     %ebx,%eax
  25:	85 db                	test   %ebx,%ebx
  27:	89 02                	mov    %eax,(%edx)
  29:	74 0f                	je     0x3a
  2b:*	3b 73 04             	cmp    0x4(%ebx),%esi     <-- trapping instruction
  2e:	75 05                	jne    0x35
  30:	89 53 04             	mov    %edx,0x4(%ebx)
  33:	eb 07                	jmp    0x3c
  35:	89 53 08             	mov    %edx,0x8(%ebx)

this patch updates the kernel copy to also have this functionality.

Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Reviewed-by: default avatarWANG Cong <wangcong@zeuux.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
parent c39dd502

scripts/decodecode

+22 −10
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

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

	exit 1

}
@@ -44,21 +44,33 @@ if [ $marker -eq 0 ]; then 
	marker=`expr index "$code" "\("`

fi



touch $T.oo

if [ $marker -ne 0 ]; then

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

	echo All code >> $T.oo

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

	beforemark=`echo "$code"`

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

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

	as $AFLAGS -o $T.o $T.s

	objdump -S $T.o

	rm $T.o $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



# 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

echo $code >> $T.s

as $AFLAGS -o $T.o $T.s

objdump -S $T.o

rm $T $T.s $T.o
 
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



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



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

echo

cat $T.aa

cleanup

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