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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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"
# Enforce ASCII-only output from tools like readelf# ensuring sed processes strings correctly.export LANG=C
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=$1 local tmpfile tmpfile=$(mktemp)
${READELF} --file-header --section-headers --symbols --wide "$objfile" > "$tmpfile"
# This assumes that readelf first prints the file header, then the section headers, then the symbols. # Note: It seems that GNU readelf does not prefix section headers with the "There are X section headers" # line when multiple options are given, so let's also match with the "Section Headers:" line. ELF_FILEHEADER=$(sed -n '/There are [0-9]* section headers, starting at offset\|Section Headers:/q;p' "$tmpfile") ELF_SECHEADERS=$(sed -n '/There are [0-9]* section headers, starting at offset\|Section Headers:/,$p' "$tmpfile" | sed -n '/Symbol table .* contains [0-9]* entries:/q;p') ELF_SYMS=$(sed -n '/Symbol table .* contains [0-9]* entries:/,$p' "$tmpfile")
rm -f -- "$tmpfile"}
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)
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