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#!/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

exit 1

}

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=

}

;;

esac

done

if [ -z "$code" ]; then

rm $T

exit

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

if [ -z "$ARCH" ]; then

case `uname -m` in

aarch64*) ARCH=arm64 ;;

arm*) ARCH=arm ;;

loongarch*) ARCH=loongarch ;;

esac

# 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"

${CROSS_COMPILE}strip $t.o

if [ "$ARCH" = "arm64" ]; then

if [ $width -eq 4 ]; then

type=inst

${CROSS_COMPILE}strip $t.o

if [ "$ARCH" = "riscv" ]; then

OBJDUMPFLAGS="-M no-aliases --section=.text -D"

${CROSS_COMPILE}strip $t.o

if [ "$ARCH" = "loongarch" ]; then

${CROSS_COMPILE}strip $t.o

if [ $pc_sub -ne 0 ]; then

if [ $PC ]; then

adj_vma=$(( $PC - $pc_sub ))

OBJDUMPFLAGS="$OBJDUMPFLAGS --adjust-vma=$adj_vma"

${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;

substr+="$opc"

opcode="$substr"

if [ "$ARCH" = "riscv" ]; then

opcode=$(echo $opcode | tr ' ' '\n' | tac | tr -d '\n')

# return if opcode bytes do not match @opline anymore

if ! echo $opline | grep -q "$opcode";

then

break

# 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 to

get_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

get_substr_opcode_bytes_num "$all_code" "$line"

ate_opcodes=$?

if ! (( $ate_opcodes )); then

continue

num_bytes_ip=$((num_bytes_ip - ($ate_opcodes * $width) ))

if (( $num_bytes_ip <= 0 )); then

break

# 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" "\("`

touch $T.oo

if [ $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.dis

echo Code starting with the faulting instruction > $T.aa

echo =========================================== >> $T.aa

code=`echo $code | sed -e 's/\r//;s/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'`

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

echo $code >> $T.s

disas $T 0

cat $T.dis >> $T.aa

cat $T.oo | sed -e "${faultlinenum}s/^$[^:]*:$$.*$/\1\*\2\t\t<-- trapping instruction/"

echo

cat $T.aa

cleanup

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