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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252#!/bin/bash# SPDX-License-Identifier: GPL-2.0# Disassemble the Code: line in Linux oopses# usage: decodecode < oops.file## options: set env. variable AFLAGS=options to pass options to "as";# e.g., to decode an i386 oops on an x86_64 system, use:# AFLAGS=--32 decodecode < 386.oops# PC=hex - the PC (program counter) the oops points to
faultlinenum=1
cleanup() { rm -f $T $T.s $T.o $T.oo $T.aa $T.dis}
die() { echo "$@" exit 1}
trap cleanup EXIT
T=`mktemp` || die "cannot create temp file"code=cont=
while read i ; do
case "$i" in*Code:*) code=$i cont=yes ;;*) [ -n "$cont" ] && { xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')" if [ -n "$xdump" ]; then code="$code $xdump" else cont= fi } ;;esac
done
if [ -z "$code" ]; then rm $T die "Code line not found"fi
echo $codecode=`echo $code | sed -e 's/.*Code: //'`
width=`expr index "$code" ' '`width=$((($width-1)/2))case $width in1) type=byte ;;2) type=2byte ;;4) type=4byte ;;esac
if [ -z "$ARCH" ]; then case `uname -m` in aarch64*) ARCH=arm64 ;; arm*) ARCH=arm ;; loongarch*) ARCH=loongarch ;; esacfi
# Params: (tmp_file, pc_sub)disas() { t=$1 pc_sub=$2
${CROSS_COMPILE}as $AFLAGS -o $t.o $t.s > /dev/null 2>&1
if [ "$ARCH" = "arm" ]; then if [ $width -eq 2 ]; then OBJDUMPFLAGS="-M force-thumb" fi
${CROSS_COMPILE}strip $t.o fi
if [ "$ARCH" = "arm64" ]; then if [ $width -eq 4 ]; then type=inst fi
${CROSS_COMPILE}strip $t.o fi
if [ "$ARCH" = "riscv" ]; then OBJDUMPFLAGS="-M no-aliases --section=.text -D" ${CROSS_COMPILE}strip $t.o fi
if [ "$ARCH" = "loongarch" ]; then ${CROSS_COMPILE}strip $t.o fi
if [ $pc_sub -ne 0 ]; then if [ $PC ]; then adj_vma=$(( $PC - $pc_sub )) OBJDUMPFLAGS="$OBJDUMPFLAGS --adjust-vma=$adj_vma" fi fi
${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $t.o | \ grep -v "/tmp\|Disassembly\|\.text\|^$" > $t.dis 2>&1}
# Match the maximum number of opcode bytes from @op_bytes contained within# @opline## Params:# @op_bytes: The string of bytes from the Code: line# @opline: The disassembled line coming from objdump## Returns:# The max number of opcode bytes from the beginning of @op_bytes which match# the opcode bytes in the objdump line.get_substr_opcode_bytes_num(){ local op_bytes=$1 local opline=$2
local retval=0 substr=""
for opc in $op_bytes; do substr+="$opc"
opcode="$substr" if [ "$ARCH" = "riscv" ]; then opcode=$(echo $opcode | tr ' ' '\n' | tac | tr -d '\n') fi
# return if opcode bytes do not match @opline anymore if ! echo $opline | grep -q "$opcode"; then break fi
# add trailing space substr+=" " retval=$((retval+1)) done
return $retval}
# Return the line number in objdump output to where the IP marker in the Code:# line points to## Params:# @all_code: code in bytes without the marker# @dis_file: disassembled file# @ip_byte: The byte to which the IP points toget_faultlinenum(){ local all_code="$1" local dis_file="$2"
# num bytes including IP byte local num_bytes_ip=$(( $3 + 1 * $width ))
# Add the two header lines (we're counting from 1). local retval=3
# remove marker all_code=$(echo $all_code | sed -e 's/[<>()]//g')
while read line do get_substr_opcode_bytes_num "$all_code" "$line" ate_opcodes=$?
if ! (( $ate_opcodes )); then continue fi
num_bytes_ip=$((num_bytes_ip - ($ate_opcodes * $width) )) if (( $num_bytes_ip <= 0 )); then break fi
# Delete matched opcode bytes from all_code. For that, compute # how many chars those opcodes are represented by and include # trailing space. # # a byte is 2 chars, ate_opcodes is also the number of trailing # spaces del_chars=$(( ($ate_opcodes * $width * 2) + $ate_opcodes ))
all_code=$(echo $all_code | sed -e "s!^.\{$del_chars\}!!")
let "retval+=1"
done < $dis_file
return $retval}
marker=`expr index "$code" "\<"`if [ $marker -eq 0 ]; then marker=`expr index "$code" "\("`fi
touch $T.ooif [ $marker -ne 0 ]; then # How many bytes to subtract from the program counter # in order to get to the beginning virtual address of the # Code: pc_sub=$(( (($marker - 1) / (2 * $width + 1)) * $width )) echo All code >> $T.oo echo ======== >> $T.oo beforemark=`echo "$code"` echo -n " .$type 0x" > $T.s
echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s
disas $T $pc_sub
cat $T.dis >> $T.oo
get_faultlinenum "$code" "$T.dis" $pc_sub faultlinenum=$?
# and fix code at-and-after marker code=`echo "$code" | cut -c$((${marker} + 1))-`
rm -f $T.o $T.s $T.disfi
echo Code starting with the faulting instruction > $T.aaecho =========================================== >> $T.aacode=`echo $code | sed -e 's/\r//;s/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'`echo -n " .$type 0x" > $T.secho $code >> $T.sdisas $T 0cat $T.dis >> $T.aa
cat $T.oo | sed -e "${faultlinenum}s/^\([^:]*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/"echocat $T.aacleanup