From 5358db0b0e16470337c6ec08177deb3f68ed7673 Mon Sep 17 00:00:00 2001 From: Rabin Vincent Date: Tue, 5 Jan 2010 20:27:58 +0530 Subject: 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 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 Signed-off-by: Michal Marek --- scripts/decodecode | 48 +++++++++++++++++++++++++++++++++++------------- 1 file changed, 35 insertions(+), 13 deletions(-) (limited to 'scripts/decodecode') diff --git a/scripts/decodecode b/scripts/decodecode index 4b00647..8b30cc3 100755 --- a/scripts/decodecode +++ b/scripts/decodecode @@ -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' >> $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 -- cgit v1.1