1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3# Disassemble the Code: line in Linux oopses 4# usage: decodecode < oops.file 5# 6# options: set env. variable AFLAGS=options to pass options to "as"; 7# e.g., to decode an i386 oops on an x86_64 system, use: 8# AFLAGS=--32 decodecode < 386.oops 9 10cleanup() { 11 rm -f $T $T.s $T.o $T.oo $T.aa $T.dis 12 exit 1 13} 14 15die() { 16 echo "$@" 17 exit 1 18} 19 20trap cleanup EXIT 21 22T=`mktemp` || die "cannot create temp file" 23code= 24cont= 25 26while read i ; do 27 28case "$i" in 29*Code:*) 30 code=$i 31 cont=yes 32 ;; 33*) 34 [ -n "$cont" ] && { 35 xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')" 36 if [ -n "$xdump" ]; then 37 code="$code $xdump" 38 else 39 cont= 40 fi 41 } 42 ;; 43esac 44 45done 46 47if [ -z "$code" ]; then 48 rm $T 49 exit 50fi 51 52echo $code 53code=`echo $code | sed -e 's/.*Code: //'` 54 55width=`expr index "$code" ' '` 56width=$((($width-1)/2)) 57case $width in 581) type=byte ;; 592) type=2byte ;; 604) type=4byte ;; 61esac 62 63if [ -z "$ARCH" ]; then 64 case `uname -m` in 65 aarch64*) ARCH=arm64 ;; 66 arm*) ARCH=arm ;; 67 esac 68fi 69 70disas() { 71 ${CROSS_COMPILE}as $AFLAGS -o $1.o $1.s > /dev/null 2>&1 72 73 if [ "$ARCH" = "arm" ]; then 74 if [ $width -eq 2 ]; then 75 OBJDUMPFLAGS="-M force-thumb" 76 fi 77 78 ${CROSS_COMPILE}strip $1.o 79 fi 80 81 if [ "$ARCH" = "arm64" ]; then 82 if [ $width -eq 4 ]; then 83 type=inst 84 fi 85 86 ${CROSS_COMPILE}strip $1.o 87 fi 88 89 ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $1.o | \ 90 grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1 91} 92 93marker=`expr index "$code" "\<"` 94if [ $marker -eq 0 ]; then 95 marker=`expr index "$code" "\("` 96fi 97 98touch $T.oo 99if [ $marker -ne 0 ]; then 100 echo All code >> $T.oo 101 echo ======== >> $T.oo 102 beforemark=`echo "$code"` 103 echo -n " .$type 0x" > $T.s 104 echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s 105 disas $T 106 cat $T.dis >> $T.oo 107 rm -f $T.o $T.s $T.dis 108 109# and fix code at-and-after marker 110 code=`echo "$code" | cut -c$((${marker} + 1))-` 111fi 112echo Code starting with the faulting instruction > $T.aa 113echo =========================================== >> $T.aa 114code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'` 115echo -n " .$type 0x" > $T.s 116echo $code >> $T.s 117disas $T 118cat $T.dis >> $T.aa 119 120# (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3, 121# i.e. the title + the "===..=" line (sed is counting from 1, 0 address is 122# special) 123faultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \ 124 $(wc -l $T.aa | cut -d" " -f1) + 3)) 125 126faultline=`cat $T.dis | head -1 | cut -d":" -f2-` 127faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'` 128 129cat $T.oo | sed -e "${faultlinenum}s/^\(.*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/" 130echo 131cat $T.aa 132cleanup 133