#!/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 READELF="${CROSS_COMPILE:-}readelf"ADDR2LINE="${CROSS_COMPILE:-}addr2line"SIZE="${CROSS_COMPILE:-}size"NM="${CROSS_COMPILE:-}nm" 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"command -v ${SIZE} >/dev/null 2>&1 || die "size isn't installed"command -v ${NM} >/dev/null 2>&1 || die "nm isn't installed" 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} # 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# kernel/init.c!  This only works for vmlinux.  Otherwise it falls back to# printing the absolute path.find_dir_prefix() {	local objfile=$1 	local start_kernel_addr=$(${READELF} -sW $objfile | awk '$8 == "start_kernel" {printf "0x%s", $2}')	[[ -z $start_kernel_addr ]] && return 	local file_line=$(${ADDR2LINE} -e $objfile $start_kernel_addr)	[[ -z $file_line ]] && return 	local prefix=${file_line%init/main.c:*}	if [[ -z $prefix ]] || [[ $prefix = $file_line ]]; then		return	fi 	DIR_PREFIX=$prefix	return 0} __faddr2line() {	local objfile=$1	local func_addr=$2	local dir_prefix=$3	local print_warnings=$4 	local func=${func_addr%+*}	local offset=${func_addr#*+}	offset=${offset%/*}	local size=	[[ $func_addr =~ "/" ]] && size=${func_addr#*/} 	if [[ -z $func ]] || [[ -z $offset ]] || [[ $func = $func_addr ]]; then		warn "bad func+offset $func_addr"		DONE=1		return	fi 	# Go through each of the object's symbols which match the func name.	# In rare cases there might be duplicates.	file_end=$(${SIZE} -Ax $objfile | awk '$1 == ".text" {print $2}')	while read symbol; do		local fields=($symbol)		local sym_base=0x${fields[0]}		local sym_type=${fields[1]}		local sym_end=${fields[3]} 		# calculate the size		local sym_size=$(($sym_end - $sym_base))		if [[ -z $sym_size ]] || [[ $sym_size -le 0 ]]; then			warn "bad symbol size: base: $sym_base end: $sym_end"			DONE=1			return		fi		sym_size=0x$(printf %x $sym_size) 		# calculate the address		local addr=$(($sym_base + $offset))		if [[ -z $addr ]] || [[ $addr = 0 ]]; then			warn "bad address: $sym_base + $offset"			DONE=1			return		fi		addr=0x$(printf %x $addr) 		# weed out non-function symbols		if [[ $sym_type != t ]] && [[ $sym_type != T ]]; then			[[ $print_warnings = 1 ]] &&				echo "skipping $func address at $addr due to non-function symbol of type '$sym_type'"			continue		fi 		# if the user provided a size, make sure it matches the symbol's size		if [[ -n $size ]] && [[ $size -ne $sym_size ]]; then			[[ $print_warnings = 1 ]] &&				echo "skipping $func address at $addr due to size mismatch ($size != $sym_size)"			continue;		fi 		# make sure the provided offset is within the symbol's range		if [[ $offset -gt $sym_size ]]; then			[[ $print_warnings = 1 ]] &&				echo "skipping $func address at $addr due to size mismatch ($offset > $sym_size)"			continue		fi 		# separate multiple entries with a blank line		[[ $FIRST = 0 ]] && echo		FIRST=0 		# pass real address to addr2line		echo "$func+$offset/$sym_size:"		local file_lines=$(${ADDR2LINE} -fpie $objfile $addr | sed "s; $dir_prefix\(\./\)*; ;")		[[ -z $file_lines ]] && return 		if [[ $LIST = 0 ]]; then			echo "$file_lines" | while read -r line			do				echo $line			done			DONE=1;			return		fi 		# show each line with context		echo "$file_lines" | 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)}' $f		done 		DONE=1 	done < <(${NM} -n $objfile | awk -v fn=$func -v end=$file_end '$3 == fn { found=1; line=$0; start=$1; next } found == 1 { found=0; print line, "0x"$1 } END {if (found == 1) print line, end; }')} [[ $# -lt 2 ]] && usage objfile=$1 LIST=0[[ "$objfile" == "--list" ]] && LIST=1 && shift && objfile=$1 [[ ! -f $objfile ]] && die "can't find objfile $objfile"shift DIR_PREFIX=supercalifragilisticexpialidociousfind_dir_prefix $objfile 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