#!/usr/bin/env bash# SPDX-License-Identifier: GPL-2.0# (c) 2014, Sasha Levin <sasha.levin@oracle.com>#set -x usage() {	echo "Usage:"	echo "	$0 -r <release>"	echo "	$0 [<vmlinux> [<base_path>|auto [<modules_path>]]]"	echo "	$0 -h"} # Try to find a Rust demanglerif type llvm-cxxfilt >/dev/null 2>&1 ; then	cppfilt=llvm-cxxfiltelif type c++filt >/dev/null 2>&1 ; then	cppfilt=c++filt	cppfilt_opts=-ifi UTIL_SUFFIX=if [[ -z ${LLVM:-} ]]; then	UTIL_PREFIX=${CROSS_COMPILE:-}else	UTIL_PREFIX=llvm-	if [[ ${LLVM} == */ ]]; then		UTIL_PREFIX=${LLVM}${UTIL_PREFIX}	elif [[ ${LLVM} == -* ]]; then		UTIL_SUFFIX=${LLVM}	fifi READELF=${UTIL_PREFIX}readelf${UTIL_SUFFIX}ADDR2LINE=${UTIL_PREFIX}addr2line${UTIL_SUFFIX}NM=${UTIL_PREFIX}nm${UTIL_SUFFIX} if [[ $1 == "-h" ]] ; then	usage	exit 0elif [[ $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		usage		exit 2	fielse	vmlinux=$1	basepath=${2-auto}	modpath=$3	release=""	debuginfod= 	# Can we use debuginfod-find?	if type debuginfod-find >/dev/null 2>&1 ; then		debuginfod=${1-only}	fi 	if [[ $vmlinux == "" && -z $debuginfod ]] ; then		echo "ERROR! vmlinux image must be specified" >&2		usage		exit 1	fifi declare aarray_support=truedeclare -A cache 2>/dev/nullif [[ $? != 0 ]]; then	aarray_support=falseelse	declare -A modcachefi find_module() {	if [[ -n $debuginfod ]] ; then		if [[ -n $modbuildid ]] ; then			debuginfod-find debuginfo $modbuildid && return		fi 		# Only using debuginfod so don't try to find vmlinux module path		if [[ $debuginfod == "only" ]] ; then			return		fi	fi 	if [ -z $release ] ; then		release=$(gdb -ex 'print init_uts_ns.name.release' -ex 'quit' -quiet -batch "$vmlinux" 2>/dev/null | sed -n 's/\$1 = "\(.*\)".*/\1/p')	fi	if [ -n "${release}" ] ; then		release_dirs="/usr/lib/debug/lib/modules/$release /lib/modules/$release"	fi 	found_without_debug_info=false	for dir in "$modpath" "$(dirname "$vmlinux")" ${release_dirs}; do		if [ -n "${dir}" ] && [ -e "${dir}" ]; then			for fn in $(find "$dir" -name "${module//_/[-_]}.ko*") ; do				if ${READELF} -WS "$fn" | grep -qwF .debug_line ; then					echo $fn					return				fi				found_without_debug_info=true			done		fi	done 	if [[ ${found_without_debug_info} == true ]]; then		echo "WARNING! No debugging info in module ${module}, rebuild with DEBUG_KERNEL and DEBUG_INFO" >&2	else		echo "WARNING! Cannot find .ko for module ${module}, please pass a valid module path" >&2	fi 	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 [[ $aarray_support == true && "${modcache[$module]+isset}" == "isset" ]]; then		local objfile=${modcache[$module]}	else		local objfile=$(find_module)		if [[ $objfile == "" ]] ; then			return		fi		if [[ $aarray_support == true ]]; then			modcache[$module]=$objfile		fi	fi 	# Remove the englobing parenthesis	symbol=${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 [[ $aarray_support == true && "${cache[$module,$name]+isset}" == "isset" ]]; then		local base_addr=${cache[$module,$name]}	else		local base_addr=$(${NM} "$objfile" 2>/dev/null | awk '$3 == "'$name'" && ($2 == "t" || $2 == "T") {print $1; exit}')		if [[ $base_addr == "" ]] ; then			# address not found			return		fi		if [[ $aarray_support == true ]]; then			cache[$module,$name]="$base_addr"		fi	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 [[ $aarray_support == true && "${cache[$module,$address]+isset}" == "isset" ]]; then		local code=${cache[$module,$address]}	else		local code=$(${ADDR2LINE} -i -e "$objfile" "$address" 2>/dev/null)		if [[ $aarray_support == true ]]; then			cache[$module,$address]=$code		fi	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'/' '} 	# Demangle if the name looks like a Rust symbol and if	# we got a Rust demangler	if [[ $name =~ ^_R && $cppfilt != "" ]] ; then		name=$("$cppfilt" "$cppfilt_opts" "$name")	fi 	# Replace old address with pretty line numbers	symbol="$segment$name ($code)"} debuginfod_get_vmlinux() {	local vmlinux_buildid=${1##* } 	if [[ $vmlinux != "" ]]; then		return	fi 	if [[ $vmlinux_buildid =~ ^[0-9a-f]+ ]]; then		vmlinux=$(debuginfod-find debuginfo $vmlinux_buildid)		if [[ $? -ne 0 ]] ; then			echo "ERROR! vmlinux image not found via debuginfod-find" >&2			usage			exit 2		fi		return	fi	echo "ERROR! Build ID for vmlinux not found. Try passing -r or specifying vmlinux" >&2	usage	exit 2} decode_code() {	local scripts=`dirname "${BASH_SOURCE[0]}"`	local lim="Code: " 	echo -n "${1%%${lim}*}"	echo "${lim}${1##*${lim}}" | $scripts/decodecode} handle_line() {	if [[ $basepath == "auto" && $vmlinux != "" ]] ; then		module=""		symbol="kernel_init+0x0/0x0"		parse_symbol		basepath=${symbol#kernel_init (}		basepath=${basepath%/init/main.c:*)}	fi 	local words spaces 	# Tokenize: words and spaces to preserve the alignment	read -ra words <<<"$1"	IFS='#' read -ra spaces <<<"$(shopt -s extglob; echo "${1//+([^[:space:]])/#}")" 	# Remove hex numbers. Do it ourselves until it happens in the	# kernel 	# We need to know the index of the last element before we	# remove elements because arrays are sparse	local last=$(( ${#words[@]} - 1 )) 	for i in "${!words[@]}"; do		# Remove the address		if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then			unset words[$i] spaces[$i]		fi	done 	# Extract info after the symbol if present. E.g.:	# func_name+0x54/0x80 (P)	#                     ^^^	# The regex assumes only uppercase letters will be used. To be	# extended if needed.	local info_str=""	if [[ ${words[$last]} =~ \([A-Z]*\) ]]; then		info_str=${words[$last]}		unset words[$last] spaces[$last]		last=$(( $last - 1 ))	fi 	# Join module name with its build id if present, as these were	# split during tokenization (e.g. "[module" and "modbuildid]").	if [[ ${words[$last]} =~ ^[0-9a-f]+\] ]]; then		words[$last-1]="${words[$last-1]} ${words[$last]}"		unset words[$last] spaces[$last]		last=$(( $last - 1 ))	fi 	if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then		module=${words[$last]}		# some traces format is "(%pS)", which like "(foo+0x0/0x1 [bar])"		# so $module may like "[bar])". Strip the right parenthesis firstly		module=${module%\)}		module=${module#\[}		module=${module%\]}		modbuildid=${module#* }		module=${module% *}		if [[ $modbuildid == $module ]]; then			modbuildid=		fi		symbol=${words[$last-1]}		unset words[$last-1] spaces[$last-1]	else		# The symbol is the last element, process it		symbol=${words[$last]}		module=		modbuildid=	fi 	unset words[$last]	parse_symbol # modifies $symbol 	# Add up the line number to the symbol	for i in "${!words[@]}"; do		echo -n "${spaces[i]}${words[i]}"	done	echo "${spaces[$last]}${symbol}${module:+ ${module}}${info_str:+ ${info_str}}"} while read line; do	# Strip unexpected carriage return at end of line	line=${line%$'\r'} 	# 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"	# Is it a version line?	elif [[ -n $debuginfod && $line =~ PID:\ [0-9]+\ Comm: ]]; then		debuginfod_get_vmlinux "$line"	else		# Nothing special in this line, show it as is		echo "$line"	fidone