1dcecc6c7SRandy Dunlap#!/bin/sh 2b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0 3dcecc6c7SRandy Dunlap# Disassemble the Code: line in Linux oopses 4dcecc6c7SRandy Dunlap# usage: decodecode < oops.file 5dcecc6c7SRandy Dunlap# 6dcecc6c7SRandy Dunlap# options: set env. variable AFLAGS=options to pass options to "as"; 7dcecc6c7SRandy Dunlap# e.g., to decode an i386 oops on an x86_64 system, use: 8dcecc6c7SRandy Dunlap# AFLAGS=--32 decodecode < 386.oops 9dcecc6c7SRandy Dunlap 10fa220d89SRandy Dunlapcleanup() { 115358db0bSRabin Vincent rm -f $T $T.s $T.o $T.oo $T.aa $T.dis 12fa220d89SRandy Dunlap exit 1 13fa220d89SRandy Dunlap} 14fa220d89SRandy Dunlap 15fa220d89SRandy Dunlapdie() { 16fa220d89SRandy Dunlap echo "$@" 17fa220d89SRandy Dunlap exit 1 18fa220d89SRandy Dunlap} 19fa220d89SRandy Dunlap 20fa220d89SRandy Dunlaptrap cleanup EXIT 21fa220d89SRandy Dunlap 22fa220d89SRandy DunlapT=`mktemp` || die "cannot create temp file" 23dcecc6c7SRandy Dunlapcode= 24dcecc6c7SRandy Dunlap 25dcecc6c7SRandy Dunlapwhile read i ; do 26dcecc6c7SRandy Dunlap 27dcecc6c7SRandy Dunlapcase "$i" in 28dcecc6c7SRandy Dunlap*Code:*) 29dcecc6c7SRandy Dunlap code=$i 30dcecc6c7SRandy Dunlap ;; 31dcecc6c7SRandy Dunlapesac 32dcecc6c7SRandy Dunlap 33dcecc6c7SRandy Dunlapdone 34dcecc6c7SRandy Dunlap 35dcecc6c7SRandy Dunlapif [ -z "$code" ]; then 36fa220d89SRandy Dunlap rm $T 37dcecc6c7SRandy Dunlap exit 38dcecc6c7SRandy Dunlapfi 39dcecc6c7SRandy Dunlap 40dcecc6c7SRandy Dunlapecho $code 41dcecc6c7SRandy Dunlapcode=`echo $code | sed -e 's/.*Code: //'` 42dcecc6c7SRandy Dunlap 435358db0bSRabin Vincentwidth=`expr index "$code" ' '` 44b396aa03SRabin Vincentwidth=$((($width-1)/2)) 455358db0bSRabin Vincentcase $width in 465358db0bSRabin Vincent1) type=byte ;; 475358db0bSRabin Vincent2) type=2byte ;; 485358db0bSRabin Vincent4) type=4byte ;; 495358db0bSRabin Vincentesac 505358db0bSRabin Vincent 515358db0bSRabin Vincentdisas() { 52b396aa03SRabin Vincent ${CROSS_COMPILE}as $AFLAGS -o $1.o $1.s > /dev/null 2>&1 535358db0bSRabin Vincent 54b396aa03SRabin Vincent if [ "$ARCH" = "arm" ]; then 55b396aa03SRabin Vincent if [ $width -eq 2 ]; then 565358db0bSRabin Vincent OBJDUMPFLAGS="-M force-thumb" 575358db0bSRabin Vincent fi 585358db0bSRabin Vincent 595358db0bSRabin Vincent ${CROSS_COMPILE}strip $1.o 605358db0bSRabin Vincent fi 615358db0bSRabin Vincent 62*be9fa663SWill Deacon if [ "$ARCH" = "arm64" ]; then 63*be9fa663SWill Deacon if [ $width -eq 4 ]; then 64*be9fa663SWill Deacon type=inst 65*be9fa663SWill Deacon fi 66*be9fa663SWill Deacon 67*be9fa663SWill Deacon ${CROSS_COMPILE}strip $1.o 68*be9fa663SWill Deacon fi 69*be9fa663SWill Deacon 705358db0bSRabin Vincent ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $1.o | \ 71b396aa03SRabin Vincent grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1 725358db0bSRabin Vincent} 735358db0bSRabin Vincent 74dcecc6c7SRandy Dunlapmarker=`expr index "$code" "\<"` 75dcecc6c7SRandy Dunlapif [ $marker -eq 0 ]; then 76dcecc6c7SRandy Dunlap marker=`expr index "$code" "\("` 77dcecc6c7SRandy Dunlapfi 78dcecc6c7SRandy Dunlap 79846442c8SArjan van de Ventouch $T.oo 80dcecc6c7SRandy Dunlapif [ $marker -ne 0 ]; then 81846442c8SArjan van de Ven echo All code >> $T.oo 82846442c8SArjan van de Ven echo ======== >> $T.oo 83846442c8SArjan van de Ven beforemark=`echo "$code"` 845358db0bSRabin Vincent echo -n " .$type 0x" > $T.s 855358db0bSRabin Vincent echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s 865358db0bSRabin Vincent disas $T 875358db0bSRabin Vincent cat $T.dis >> $T.oo 885358db0bSRabin Vincent rm -f $T.o $T.s $T.dis 89dcecc6c7SRandy Dunlap 90dcecc6c7SRandy Dunlap# and fix code at-and-after marker 91dcecc6c7SRandy Dunlap code=`echo "$code" | cut -c$((${marker} + 1))-` 92dcecc6c7SRandy Dunlapfi 93846442c8SArjan van de Venecho Code starting with the faulting instruction > $T.aa 94846442c8SArjan van de Venecho =========================================== >> $T.aa 955358db0bSRabin Vincentcode=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'` 965358db0bSRabin Vincentecho -n " .$type 0x" > $T.s 97dcecc6c7SRandy Dunlapecho $code >> $T.s 985358db0bSRabin Vincentdisas $T 995358db0bSRabin Vincentcat $T.dis >> $T.aa 100846442c8SArjan van de Ven 10118ff44b1SBorislav Petkov# (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3, 10218ff44b1SBorislav Petkov# i.e. the title + the "===..=" line (sed is counting from 1, 0 address is 10318ff44b1SBorislav Petkov# special) 10418ff44b1SBorislav Petkovfaultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \ 10518ff44b1SBorislav Petkov $(wc -l $T.aa | cut -d" " -f1) + 3)) 10618ff44b1SBorislav Petkov 1072a95e37cSBorislav Petkovfaultline=`cat $T.dis | head -1 | cut -d":" -f2-` 1085358db0bSRabin Vincentfaultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'` 109846442c8SArjan van de Ven 11018ff44b1SBorislav Petkovcat $T.oo | sed -e "${faultlinenum}s/^\(.*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/" 111846442c8SArjan van de Venecho 112846442c8SArjan van de Vencat $T.aa 113846442c8SArjan van de Vencleanup 114