#!/bin/bash# SPDX-License-Identifier: GPL-2.0# (c) 2014, Sasha Levin <sasha.levin@oracle.com>#set -x if [[ $# < 1 ]]; then	echo "Usage:"	echo "	$0 -r <release> | <vmlinux> [base path] [modules path]"	exit 1fi if [[ $1 == "-r" ]] ; then	vmlinux=""	basepath="auto"	modpath=""	release=$2 	for fn in {,/usr/lib/debug}/boot/vmlinux-$release{,.debug} /lib/modules/$release{,/build}/vmlinux ; do		if [ -e "$fn" ] ; then			vmlinux=$fn			break		fi	done 	if [[ $vmlinux == "" ]] ; then		echo "ERROR! vmlinux image for release $release is not found" >&2		exit 2	fielse	vmlinux=$1	basepath=${2-auto}	modpath=$3	release=""fi declare -A cachedeclare -A modcache find_module() {	if [[ "$modpath" != "" ]] ; then		for fn in $(find "$modpath" -name "${module//_/[-_]}.ko*") ; do			if readelf -WS "$fn" | grep -qwF .debug_line ; then				echo $fn				return			fi		done		return 1	fi 	modpath=$(dirname "$vmlinux")	find_module && return 	if [[ $release == "" ]] ; then		release=$(gdb -ex 'print init_uts_ns.name.release' -ex 'quit' -quiet -batch "$vmlinux" | sed -n 's/\$1 = "\(.*\)".*/\1/p')	fi 	for dn in {/usr/lib/debug,}/lib/modules/$release ; do		if [ -e "$dn" ] ; then			modpath="$dn"			find_module && return		fi	done 	modpath=""	return 1} parse_symbol() {	# The structure of symbol at this point is:	#   ([name]+[offset]/[total length])	#	# For example:	#   do_basic_setup+0x9c/0xbf 	if [[ $module == "" ]] ; then		local objfile=$vmlinux	elif [[ "${modcache[$module]+isset}" == "isset" ]]; then		local objfile=${modcache[$module]}	else		local objfile=$(find_module)		if [[ $objfile == "" ]] ; then			echo "WARNING! Modules path isn't set, but is needed to parse this symbol" >&2			return		fi		modcache[$module]=$objfile	fi 	# Remove the englobing parenthesis	symbol=${symbol#\(}	symbol=${symbol%\)} 	# Strip segment	local segment	if [[ $symbol == *:* ]] ; then		segment=${symbol%%:*}:		symbol=${symbol#*:}	fi 	# Strip the symbol name so that we could look it up	local name=${symbol%+*} 	# Use 'nm vmlinux' to figure out the base address of said symbol.	# It's actually faster to call it every time than to load it	# all into bash.	if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then		local base_addr=${cache[$module,$name]}	else		local base_addr=$(nm "$objfile" | awk '$3 == "'$name'" && ($2 == "t" || $2 == "T") {print $1; exit}')		if [[ $base_addr == "" ]] ; then			# address not found			return		fi		cache[$module,$name]="$base_addr"	fi	# Let's start doing the math to get the exact address into the	# symbol. First, strip out the symbol total length.	local expr=${symbol%/*} 	# Now, replace the symbol name with the base address we found	# before.	expr=${expr/$name/0x$base_addr} 	# Evaluate it to find the actual address	expr=$((expr))	local address=$(printf "%x\n" "$expr") 	# Pass it to addr2line to get filename and line number	# Could get more than one result	if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then		local code=${cache[$module,$address]}	else		local code=$(${CROSS_COMPILE}addr2line -i -e "$objfile" "$address")		cache[$module,$address]=$code	fi 	# addr2line doesn't return a proper error code if it fails, so	# we detect it using the value it prints so that we could preserve	# the offset/size into the function and bail out	if [[ $code == "??:0" ]]; then		return	fi 	# Strip out the base of the path on each line	code=$(while read -r line; do echo "${line#$basepath/}"; done <<< "$code") 	# In the case of inlines, move everything to same line	code=${code//$'\n'/' '} 	# Replace old address with pretty line numbers	symbol="$segment$name ($code)"} decode_code() {	local scripts=`dirname "${BASH_SOURCE[0]}"` 	echo "$1" | $scripts/decodecode} handle_line() {	local words 	# Tokenize	read -a words <<<"$1" 	# Remove hex numbers. Do it ourselves until it happens in the	# kernel 	# We need to know the index of the last element before we	# remove elements because arrays are sparse	local last=$(( ${#words[@]} - 1 )) 	for i in "${!words[@]}"; do		# Remove the address		if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then			unset words[$i]		fi 		# Format timestamps with tabs		if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then			unset words[$i]			words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")		fi	done 	if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then		module=${words[$last]}		module=${module#\[}		module=${module%\]}		symbol=${words[$last-1]}		unset words[$last-1]	else		# The symbol is the last element, process it		symbol=${words[$last]}		module=	fi 	unset words[$last]	parse_symbol # modifies $symbol 	# Add up the line number to the symbol	echo "${words[@]}" "$symbol $module"} if [[ $basepath == "auto" ]] ; then	module=""	symbol="kernel_init+0x0/0x0"	parse_symbol	basepath=${symbol#kernel_init (}	basepath=${basepath%/init/main.c:*)}fi while read line; do	# Let's see if we have an address in the line	if [[ $line =~ \[\<([^]]+)\>\] ]] ||	   [[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then		# Translate address to line numbers		handle_line "$line"	# Is it a code line?	elif [[ $line == *Code:* ]]; then		decode_code "$line"	else		# Nothing special in this line, show it as is		echo "$line"	fidone