#!/bin/bash# SPDX-License-Identifier: GPL-2.0## Translate stack dump function offsets.## addr2line doesn't work with KASLR addresses.  This works similarly to# addr2line, but instead takes the 'func+0x123' format as input:##   $ ./scripts/faddr2line ~/k/vmlinux meminfo_proc_show+0x5/0x568#   meminfo_proc_show+0x5/0x568:#   meminfo_proc_show at fs/proc/meminfo.c:27## If the address is part of an inlined function, the full inline call chain is# printed:##   $ ./scripts/faddr2line ~/k/vmlinux native_write_msr+0x6/0x27#   native_write_msr+0x6/0x27:#   arch_static_branch at arch/x86/include/asm/msr.h:121#    (inlined by) static_key_false at include/linux/jump_label.h:125#    (inlined by) native_write_msr at arch/x86/include/asm/msr.h:125## The function size after the '/' in the input is optional, but recommended.# It's used to help disambiguate any duplicate symbol names, which can occur# rarely.  If the size is omitted for a duplicate symbol then it's possible for# multiple code sites to be printed:##   $ ./scripts/faddr2line ~/k/vmlinux raw_ioctl+0x5#   raw_ioctl+0x5/0x20:#   raw_ioctl at drivers/char/raw.c:122##   raw_ioctl+0x5/0xb1:#   raw_ioctl at net/ipv4/raw.c:876## Multiple addresses can be specified on a single command line:##   $ ./scripts/faddr2line ~/k/vmlinux type_show+0x10/45 free_reserved_area+0x90#   type_show+0x10/0x2d:#   type_show at drivers/video/backlight/backlight.c:213##   free_reserved_area+0x90/0x123:#   free_reserved_area at mm/page_alloc.c:6429 (discriminator 2)  set -o errexitset -o nounset usage() {	echo "usage: faddr2line [--list] <object file> <func+offset> <func+offset>..." >&2	exit 1} warn() {	echo "$1" >&2} die() {	echo "ERROR: $1" >&2	exit 1} UTIL_SUFFIX=""if [[ "${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}"AWK="awk"GREP="grep" command -v ${AWK} >/dev/null 2>&1 || die "${AWK} isn't installed"command -v ${READELF} >/dev/null 2>&1 || die "${READELF} isn't installed"command -v ${ADDR2LINE} >/dev/null 2>&1 || die "${ADDR2LINE} isn't installed" # Try to figure out the source directory prefix so we can remove it from the# addr2line output.  HACK ALERT: This assumes that start_kernel() is in# init/main.c!  This only works for vmlinux.  Otherwise it falls back to# printing the absolute path.find_dir_prefix() {	local start_kernel_addr=$(echo "${ELF_SYMS}" | sed 's/\[.*\]//' |		${AWK} '$8 == "start_kernel" {printf "0x%s", $2}')	[[ -z $start_kernel_addr ]] && return 	run_addr2line ${start_kernel_addr} ""	[[ -z $ADDR2LINE_OUT ]] && return 	local file_line=${ADDR2LINE_OUT#* at }	if [[ -z $file_line ]] || [[ $file_line = $ADDR2LINE_OUT ]]; then		return	fi	local prefix=${file_line%init/main.c:*}	if [[ -z $prefix ]] || [[ $prefix = $file_line ]]; then		return	fi 	DIR_PREFIX=$prefix	return 0} run_readelf() {	local objfile=$1	local out=$(${READELF} --file-header --section-headers --symbols --wide $objfile) 	# This assumes that readelf first prints the file header, then the section headers, then the symbols.	# Note: It seems that GNU readelf does not prefix section headers with the "There are X section headers"	# line when multiple options are given, so let's also match with the "Section Headers:" line.	ELF_FILEHEADER=$(echo "${out}" | sed -n '/There are [0-9]* section headers, starting at offset\|Section Headers:/q;p')	ELF_SECHEADERS=$(echo "${out}" | sed -n '/There are [0-9]* section headers, starting at offset\|Section Headers:/,$p' | sed -n '/Symbol table .* contains [0-9]* entries:/q;p')	ELF_SYMS=$(echo "${out}" | sed -n '/Symbol table .* contains [0-9]* entries:/,$p')} check_vmlinux() {	# vmlinux uses absolute addresses in the section table rather than	# section offsets.	IS_VMLINUX=0	local file_type=$(echo "${ELF_FILEHEADER}" |		${AWK} '$1 == "Type:" { print $2; exit }')	if [[ $file_type = "EXEC" ]] || [[ $file_type == "DYN" ]]; then		IS_VMLINUX=1	fi} init_addr2line() {	local objfile=$1 	check_vmlinux 	ADDR2LINE_ARGS="--functions --pretty-print --inlines --addresses --exe=$objfile"	if [[ $IS_VMLINUX = 1 ]]; then		# If the executable file is vmlinux, we don't pass section names to		# addr2line, so we can launch it now as a single long-running process.		coproc ADDR2LINE_PROC (${ADDR2LINE} ${ADDR2LINE_ARGS})	fi} run_addr2line() {	local addr=$1	local sec_name=$2 	if [[ $IS_VMLINUX = 1 ]]; then		# We send to the addr2line process: (1) the address, then (2) a sentinel		# value, i.e., something that can't be interpreted as a valid address		# (i.e., ","). This causes addr2line to write out: (1) the answer for		# our address, then (2) either "?? ??:0" or "0x0...0: ..." (if		# using binutils' addr2line), or "," (if using LLVM's addr2line).		echo ${addr} >& "${ADDR2LINE_PROC[1]}"		echo "," >& "${ADDR2LINE_PROC[1]}"		local first_line		read -r first_line <& "${ADDR2LINE_PROC[0]}"		ADDR2LINE_OUT=$(echo "${first_line}" | sed 's/^0x[0-9a-fA-F]*: //')		while read -r line <& "${ADDR2LINE_PROC[0]}"; do			if [[ "$line" == "?? ??:0" ]] || [[ "$line" == "," ]] || [[ $(echo "$line" | ${GREP} "^0x00*: ") ]]; then				break			fi			ADDR2LINE_OUT+=$'\n'$(echo "$line" | sed 's/^0x[0-9a-fA-F]*: //')		done	else		# Run addr2line as a single invocation.		local sec_arg		[[ -z $sec_name ]] && sec_arg="" || sec_arg="--section=${sec_name}"		ADDR2LINE_OUT=$(${ADDR2LINE} ${ADDR2LINE_ARGS} ${sec_arg} ${addr} | sed 's/^0x[0-9a-fA-F]*: //')	fi} __faddr2line() {	local objfile=$1	local func_addr=$2	local dir_prefix=$3	local print_warnings=$4 	local sym_name=${func_addr%+*}	local func_offset=${func_addr#*+}	func_offset=${func_offset%/*}	local user_size=	[[ $func_addr =~ "/" ]] && user_size=${func_addr#*/} 	if [[ -z $sym_name ]] || [[ -z $func_offset ]] || [[ $sym_name = $func_addr ]]; then		warn "bad func+offset $func_addr"		DONE=1		return	fi 	# Go through each of the object's symbols which match the func name.	# In rare cases there might be duplicates, in which case we print all	# matches.	while read line; do		local fields=($line)		local sym_addr=0x${fields[1]}		local sym_elf_size=${fields[2]}		local sym_sec=${fields[6]}		local sec_size		local sec_name 		# Get the section size:		sec_size=$(echo "${ELF_SECHEADERS}" | sed 's/\[ /\[/' |			${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print "0x" $6; exit }') 		if [[ -z $sec_size ]]; then			warn "bad section size: section: $sym_sec"			DONE=1			return		fi 		# Get the section name:		sec_name=$(echo "${ELF_SECHEADERS}" | sed 's/\[ /\[/' |			${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print $2; exit }') 		if [[ -z $sec_name ]]; then			warn "bad section name: section: $sym_sec"			DONE=1			return		fi 		# Calculate the symbol size.		#		# Unfortunately we can't use the ELF size, because kallsyms		# also includes the padding bytes in its size calculation.  For		# kallsyms, the size calculation is the distance between the		# symbol and the next symbol in a sorted list.		local sym_size		local cur_sym_addr		local found=0		while read line; do			local fields=($line)			cur_sym_addr=0x${fields[1]}			local cur_sym_elf_size=${fields[2]}			local cur_sym_name=${fields[7]:-} 			# is_mapping_symbol(cur_sym_name)			if [[ ${cur_sym_name} =~ ^(\.L|L0|\$) ]]; then				continue			fi 			if [[ $cur_sym_addr = $sym_addr ]] &&			   [[ $cur_sym_elf_size = $sym_elf_size ]] &&			   [[ $cur_sym_name = $sym_name ]]; then				found=1				continue			fi 			if [[ $found = 1 ]]; then				sym_size=$(($cur_sym_addr - $sym_addr))				[[ $sym_size -lt $sym_elf_size ]] && continue;				found=2				break			fi		done < <(echo "${ELF_SYMS}" | sed 's/\[.*\]//' | ${AWK} -v sec=$sym_sec '$7 == sec' | sort --key=2 | ${GREP} -A1 --no-group-separator " ${sym_name}$") 		if [[ $found = 0 ]]; then			warn "can't find symbol: sym_name: $sym_name sym_sec: $sym_sec sym_addr: $sym_addr sym_elf_size: $sym_elf_size"			DONE=1			return		fi 		# If nothing was found after the symbol, assume it's the last		# symbol in the section.		[[ $found = 1 ]] && sym_size=$(($sec_size - $sym_addr)) 		if [[ -z $sym_size ]] || [[ $sym_size -le 0 ]]; then			warn "bad symbol size: sym_addr: $sym_addr cur_sym_addr: $cur_sym_addr"			DONE=1			return		fi 		sym_size=0x$(printf %x $sym_size) 		# Calculate the address from user-supplied offset:		local addr=$(($sym_addr + $func_offset))		if [[ -z $addr ]] || [[ $addr = 0 ]]; then			warn "bad address: $sym_addr + $func_offset"			DONE=1			return		fi		addr=0x$(printf %x $addr) 		# If the user provided a size, make sure it matches the symbol's size:		if [[ -n $user_size ]] && [[ $user_size -ne $sym_size ]]; then			[[ $print_warnings = 1 ]] &&				echo "skipping $sym_name address at $addr due to size mismatch ($user_size != $sym_size)"			continue;		fi 		# Make sure the provided offset is within the symbol's range:		if [[ $func_offset -gt $sym_size ]]; then			[[ $print_warnings = 1 ]] &&				echo "skipping $sym_name address at $addr due to size mismatch ($func_offset > $sym_size)"			continue		fi 		# In case of duplicates or multiple addresses specified on the		# cmdline, separate multiple entries with a blank line:		[[ $FIRST = 0 ]] && echo		FIRST=0 		echo "$sym_name+$func_offset/$sym_size:" 		# Pass section address to addr2line and strip absolute paths		# from the output:		run_addr2line $addr $sec_name		local output=$(echo "${ADDR2LINE_OUT}" | sed "s; $dir_prefix\(\./\)*; ;")		[[ -z $output ]] && continue 		# Default output (non --list):		if [[ $LIST = 0 ]]; then			echo "$output" | while read -r line			do				echo $line			done			DONE=1;			continue		fi 		# For --list, show each line with its corresponding source code:		echo "$output" | while read -r line		do			echo			echo $line			n=$(echo $line | sed 's/.*:\([0-9]\+\).*/\1/g')			n1=$[$n-5]			n2=$[$n+5]			f=$(echo $line | sed 's/.*at \(.\+\):.*/\1/g')			${AWK} 'NR>=strtonum("'$n1'") && NR<=strtonum("'$n2'") { if (NR=='$n') printf(">%d<", NR); else printf(" %d ", NR); printf("\t%s\n", $0)}' $f		done 		DONE=1 	done < <(echo "${ELF_SYMS}" | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$8 == fn')} [[ $# -lt 2 ]] && usage objfile=$1 LIST=0[[ "$objfile" == "--list" ]] && LIST=1 && shift && objfile=$1 [[ ! -f $objfile ]] && die "can't find objfile $objfile"shift run_readelf $objfile echo "${ELF_SECHEADERS}" | ${GREP} -q '\.debug_info' || die "CONFIG_DEBUG_INFO not enabled" init_addr2line $objfile DIR_PREFIX=supercalifragilisticexpialidociousfind_dir_prefix FIRST=1while [[ $# -gt 0 ]]; do	func_addr=$1	shift 	# print any matches found	DONE=0	__faddr2line $objfile $func_addr $DIR_PREFIX 0 	# if no match was found, print warnings	if [[ $DONE = 0 ]]; then		__faddr2line $objfile $func_addr $DIR_PREFIX 1		warn "no match for $func_addr"	fidone