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#!/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 errexit set -o nounset usage() { echo "usage: faddr2line [--list] <object file> <func+offset> <func+offset>..." >&2 exit 1 } warn() { echo "$1" >&2 } die() { echo "ERROR: $1" >&2 exit 1 } READELF="${CROSS_COMPILE:-}readelf" ADDR2LINE="${CROSS_COMPILE:-}addr2line" AWK="awk" 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 objfile=$1 local start_kernel_addr=$(${READELF} --symbols --wide $objfile \| sed 's/\[.\]//' \| ${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=$4 local sym_name=${func_addr%+} local func_offset=${func_addr#+} func_offset=${func_offset%/} local user_size= local file_type local is_vmlinux=0 [[ $func_addr =~ "/" ]] && user_size=${func_addr#/} if [[ -z $sym_name ]] \|\| [[ -z $func_offset ]] \|\| [[ $sym_name = $func_addr ]]; then warn "bad func+offset $func_addr" DONE=1 return fi # vmlinux uses absolute addresses in the section table rather than # section offsets. local file_type=$(${READELF} --file-header $objfile \| ${AWK} '$1 == "Type:" { print $2; exit }') if [[ $file_type = "EXEC" ]] \|\| [[ $file_type == "DYN" ]]; then is_vmlinux=1 fi # Go through each of the object's symbols which match the func name. # In rare cases there might be duplicates, in which case we print all # matches. while read line; do local fields=($line) local sym_addr=0x${fields[1]} local sym_elf_size=${fields[2]} local sym_sec=${fields[6]} local sec_size local sec_name # Get the section size: sec_size=$(${READELF} --section-headers --wide $objfile \| sed 's/\[ /\[/' \| ${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print "0x" $6; exit }') if [[ -z $sec_size ]]; then warn "bad section size: section: $sym_sec" DONE=1 return fi # Get the section name: sec_name=$(${READELF} --section-headers --wide $objfile \| 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]:-} 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 $sym_elf_size ]] && continue; found=2 break fi done < <(${READELF} --symbols --wide $objfile \| 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: local args="--functions --pretty-print --inlines --exe=$objfile" [[ $is_vmlinux = 0 ]] && args="$args --section=$sec_name" local output=$(${ADDR2LINE} $args $addr \| 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)}' $f done DONE=1 done < <(${READELF} --symbols --wide $objfile \| sed 's/\[.*\]//' \| ${AWK} -v fn=$sym_name '$4 == "FUNC" && $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 DIR_PREFIX=supercalifragilisticexpialidocious find_dir_prefix $objfile FIRST=1 while [[ $# -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" fi done

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