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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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 demanglerif type llvm-cxxfilt >/dev/null 2>&1 ; then cppfilt=llvm-cxxfiltelif type c++filt >/dev/null 2>&1 ; then cppfilt=c++filt cppfilt_opts=-ifi
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} fifi
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 0elif [[ $1 == "-R" ]] ; then decode_retaddr=true shift 1fi
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 fi done
if [[ $vmlinux == "" ]] ; then echo "ERROR! vmlinux image for release $release is not found" >&2 usage exit 2 fielse 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} fi
if [[ $vmlinux == "" && -z $debuginfod ]] ; then echo "ERROR! vmlinux image must be specified" >&2 usage exit 1 fifi
declare aarray_support=truedeclare -A cache 2>/dev/nullif [[ $? != 0 ]]; then aarray_support=falseelse declare -A modcachefi
find_module() { if [[ -n $debuginfod ]] ; then if [[ -n $modbuildid ]] ; then debuginfod-find debuginfo $modbuildid && return fi
# Only using debuginfod so don't try to find vmlinux module path if [[ $debuginfod == "only" ]] ; then return fi fi
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') fi if [ -n "${release}" ] ; then release_dirs="/usr/lib/debug/lib/modules/$release /lib/modules/$release" fi
found_without_debug_info=false for dir in "$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 fi found_without_debug_info=true done fi 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 fi
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 fi if [[ $aarray_support == true ]]; then modcache[$module]=$objfile fi fi
# Remove the englobing parenthesis symbol=${symbol#\(} symbol=${symbol%\)}
# Strip segment local segment if [[ $symbol == *:* ]] ; then segment=${symbol%%:*}: symbol=${symbol#*:} fi
# Strip the symbol name so that we could look it up local name=${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 fi if [[ $aarray_support == true ]]; then cache[$module,$name]="$base_addr" fi fi # 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=$((expr)) fi local address=$(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 fi fi
# 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 [[ $code == "??:0" ]]; then return fi
# Strip out the base of the path on each line code=$(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" "$name") fi
# Replace old address with pretty line numbers symbol="$segment$name ($code)"}
debuginfod_get_vmlinux() { local vmlinux_buildid=${1##* }
if [[ $vmlinux != "" ]]; then return fi
if [[ $vmlinux_buildid =~ ^[0-9a-f]+ ]]; then vmlinux=$(debuginfod-find debuginfo $vmlinux_buildid) if [[ $? -ne 0 ]] ; then echo "ERROR! vmlinux image not found via debuginfod-find" >&2 usage exit 2 fi return fi echo "ERROR! Build ID for vmlinux not found. Try passing -r or specifying vmlinux" >&2 usage exit 2}
decode_code() { local scripts=`dirname "${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:*)} fi
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] fi 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 )) fi
# 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 )) fi
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 == $module ]]; then modbuildid= fi symbol=${words[$last-1]} unset words[$last-1] spaces[$last-1] else # The symbol is the last element, process it symbol=${words[$last]} module= modbuildid= fi
unset words[$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" fidone