suse_kernel/scripts/decode_stacktrace.sh at master · nvmochs/suse_kernel · GitHub

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#!/usr/bin/env bash

# SPDX-License-Identifier: GPL-2.0

#set -x

usage() {

echo "Usage:"

echo " $0 [-R] -r <release>"

echo " $0 [-R] [<vmlinux> [<base_path>|auto [<modules_path>]]]"

echo " $0 -h"

echo "Options:"

echo " -R: decode return address instead of caller address."

}

# Try to find a Rust demangler

if type llvm-cxxfilt >/dev/null 2>&1 ; then

cppfilt=llvm-cxxfilt

elif type c++filt >/dev/null 2>&1 ; then

cppfilt=c++filt

cppfilt_opts=-i

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}

READELF=${UTIL_PREFIX}readelf${UTIL_SUFFIX}

ADDR2LINE=${UTIL_PREFIX}addr2line${UTIL_SUFFIX}

NM=${UTIL_PREFIX}nm${UTIL_SUFFIX}

decode_retaddr=false

if [[ $1 == "-h" ]] ; then

usage

exit 0

elif [[ $1 == "-R" ]] ; then

decode_retaddr=true

shift 1

if [[ $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

done

if [[ $vmlinux == "" ]] ; then

echo "ERROR! vmlinux image for release $release is not found" >&2

usage

exit 2

else

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}

if [[ $vmlinux == "" && -z $debuginfod ]] ; then

echo "ERROR! vmlinux image must be specified" >&2

usage

exit 1

declare aarray_support=true

declare -A cache 2>/dev/null

if [[ $? != 0 ]]; then

aarray_support=false

else

declare -A modcache

find_module() {

if [[ -n $debuginfod ]] ; then

if [[ -n $modbuildid ]] ; then

debuginfod-find debuginfo $modbuildid && return

# Only using debuginfod so don't try to find vmlinux module path

if [[ $debuginfod == "only" ]] ; then

return

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')

if [ -n "${release}" ] ; then

release_dirs="/usr/lib/debug/lib/modules/$release /lib/modules/$release"

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

found_without_debug_info=true

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

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

if [[ $aarray_support == true ]]; then

modcache[$module]=$objfile

# Remove the englobing parenthesis

symbol=${symbol#\(}

symbol=${symbol%\)}

# Strip segment

local segment

if [[ $symbol == *:* ]] ; then

segment=${symbol%%:*}:

symbol=${symbol#*:}

# 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

if [[ $aarray_support == true ]]; then

cache[$module,$name]="$base_addr"

# Let's start doing the math to get the exact address into the

# symbol. First, strip out the symbol total length.

local expr=${symbol%/*}

# Also parse the offset from symbol.

local offset=${expr#*+}

offset=$((offset))

# 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

# The stack trace shows the return address, which is the next

# instruction after the actual call, so as long as it's in the same

# symbol, subtract one from that to point the call instruction.

if [[ $decode_retaddr == false && $offset != 0 ]]; then

expr=$((expr-1))

else

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

# 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

# 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")

# Replace old address with pretty line numbers

symbol="$segment$name ($code)"

}

debuginfod_get_vmlinux() {

local vmlinux_buildid=${1##* }

if [[ $vmlinux != "" ]]; then

return

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

return

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:*)}

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]

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 ))

# 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 ))

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=

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=

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"

done

suse_kernel/scripts/decode_stacktrace.sh at master · nvmochs/suse_kernel · GitHub

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