325 lines
7.5 KiB
Bash
325 lines
7.5 KiB
Bash
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#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# (c) 2014, Sasha Levin <sasha.levin@oracle.com>
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#set -x
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usage() {
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echo "Usage:"
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echo " $0 -r <release> | <vmlinux> [<base path>|auto] [<modules path>]"
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}
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# Try to find a Rust demangler
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if type llvm-cxxfilt >/dev/null 2>&1 ; then
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cppfilt=llvm-cxxfilt
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elif type c++filt >/dev/null 2>&1 ; then
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cppfilt=c++filt
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cppfilt_opts=-i
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fi
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UTIL_SUFFIX=
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if [[ -z ${LLVM:-} ]]; then
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UTIL_PREFIX=${CROSS_COMPILE:-}
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else
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UTIL_PREFIX=llvm-
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if [[ ${LLVM} == */ ]]; then
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UTIL_PREFIX=${LLVM}${UTIL_PREFIX}
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elif [[ ${LLVM} == -* ]]; then
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UTIL_SUFFIX=${LLVM}
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fi
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fi
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READELF=${UTIL_PREFIX}readelf${UTIL_SUFFIX}
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ADDR2LINE=${UTIL_PREFIX}addr2line${UTIL_SUFFIX}
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if [[ $1 == "-r" ]] ; then
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vmlinux=""
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basepath="auto"
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modpath=""
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release=$2
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for fn in {,/usr/lib/debug}/boot/vmlinux-$release{,.debug} /lib/modules/$release{,/build}/vmlinux ; do
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if [ -e "$fn" ] ; then
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vmlinux=$fn
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break
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fi
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done
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if [[ $vmlinux == "" ]] ; then
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echo "ERROR! vmlinux image for release $release is not found" >&2
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usage
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exit 2
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fi
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else
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vmlinux=$1
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basepath=${2-auto}
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modpath=$3
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release=""
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debuginfod=
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# Can we use debuginfod-find?
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if type debuginfod-find >/dev/null 2>&1 ; then
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debuginfod=${1-only}
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fi
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if [[ $vmlinux == "" && -z $debuginfod ]] ; then
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echo "ERROR! vmlinux image must be specified" >&2
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usage
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exit 1
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fi
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fi
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declare aarray_support=true
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declare -A cache 2>/dev/null
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if [[ $? != 0 ]]; then
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aarray_support=false
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else
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declare -A modcache
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fi
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find_module() {
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if [[ -n $debuginfod ]] ; then
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if [[ -n $modbuildid ]] ; then
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debuginfod-find debuginfo $modbuildid && return
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fi
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# Only using debuginfod so don't try to find vmlinux module path
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if [[ $debuginfod == "only" ]] ; then
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return
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fi
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fi
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if [[ "$modpath" != "" ]] ; then
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for fn in $(find "$modpath" -name "${module//_/[-_]}.ko*") ; do
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if ${READELF} -WS "$fn" | grep -qwF .debug_line ; then
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echo $fn
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return
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fi
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done
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return 1
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fi
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modpath=$(dirname "$vmlinux")
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find_module && return
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if [[ $release == "" ]] ; then
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release=$(gdb -ex 'print init_uts_ns.name.release' -ex 'quit' -quiet -batch "$vmlinux" 2>/dev/null | sed -n 's/\$1 = "\(.*\)".*/\1/p')
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fi
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for dn in {/usr/lib/debug,}/lib/modules/$release ; do
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if [ -e "$dn" ] ; then
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modpath="$dn"
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find_module && return
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fi
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done
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modpath=""
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return 1
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}
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parse_symbol() {
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# The structure of symbol at this point is:
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# ([name]+[offset]/[total length])
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#
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# For example:
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# do_basic_setup+0x9c/0xbf
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if [[ $module == "" ]] ; then
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local objfile=$vmlinux
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elif [[ $aarray_support == true && "${modcache[$module]+isset}" == "isset" ]]; then
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local objfile=${modcache[$module]}
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else
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local objfile=$(find_module)
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if [[ $objfile == "" ]] ; then
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echo "WARNING! Modules path isn't set, but is needed to parse this symbol" >&2
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return
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fi
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if [[ $aarray_support == true ]]; then
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modcache[$module]=$objfile
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fi
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fi
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# Remove the englobing parenthesis
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symbol=${symbol#\(}
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symbol=${symbol%\)}
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# Strip segment
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local segment
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if [[ $symbol == *:* ]] ; then
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segment=${symbol%%:*}:
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symbol=${symbol#*:}
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fi
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# Strip the symbol name so that we could look it up
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local name=${symbol%+*}
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# Use 'nm vmlinux' to figure out the base address of said symbol.
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# It's actually faster to call it every time than to load it
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# all into bash.
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if [[ $aarray_support == true && "${cache[$module,$name]+isset}" == "isset" ]]; then
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local base_addr=${cache[$module,$name]}
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else
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local base_addr=$(nm "$objfile" 2>/dev/null | awk '$3 == "'$name'" && ($2 == "t" || $2 == "T") {print $1; exit}')
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if [[ $base_addr == "" ]] ; then
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# address not found
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return
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fi
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if [[ $aarray_support == true ]]; then
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cache[$module,$name]="$base_addr"
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fi
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fi
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# Let's start doing the math to get the exact address into the
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# symbol. First, strip out the symbol total length.
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local expr=${symbol%/*}
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# Now, replace the symbol name with the base address we found
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# before.
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expr=${expr/$name/0x$base_addr}
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# Evaluate it to find the actual address
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expr=$((expr))
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local address=$(printf "%x\n" "$expr")
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# Pass it to addr2line to get filename and line number
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# Could get more than one result
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if [[ $aarray_support == true && "${cache[$module,$address]+isset}" == "isset" ]]; then
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local code=${cache[$module,$address]}
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else
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local code=$(${ADDR2LINE} -i -e "$objfile" "$address" 2>/dev/null)
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if [[ $aarray_support == true ]]; then
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cache[$module,$address]=$code
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fi
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fi
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# addr2line doesn't return a proper error code if it fails, so
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# we detect it using the value it prints so that we could preserve
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# the offset/size into the function and bail out
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if [[ $code == "??:0" ]]; then
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return
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fi
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# Strip out the base of the path on each line
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code=$(while read -r line; do echo "${line#$basepath/}"; done <<< "$code")
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# In the case of inlines, move everything to same line
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code=${code//$'\n'/' '}
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# Demangle if the name looks like a Rust symbol and if
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# we got a Rust demangler
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if [[ $name =~ ^_R && $cppfilt != "" ]] ; then
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name=$("$cppfilt" "$cppfilt_opts" "$name")
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fi
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# Replace old address with pretty line numbers
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symbol="$segment$name ($code)"
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}
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debuginfod_get_vmlinux() {
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local vmlinux_buildid=${1##* }
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if [[ $vmlinux != "" ]]; then
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return
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fi
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if [[ $vmlinux_buildid =~ ^[0-9a-f]+ ]]; then
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vmlinux=$(debuginfod-find debuginfo $vmlinux_buildid)
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if [[ $? -ne 0 ]] ; then
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echo "ERROR! vmlinux image not found via debuginfod-find" >&2
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usage
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exit 2
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fi
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return
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fi
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echo "ERROR! Build ID for vmlinux not found. Try passing -r or specifying vmlinux" >&2
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usage
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exit 2
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}
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decode_code() {
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local scripts=`dirname "${BASH_SOURCE[0]}"`
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echo "$1" | $scripts/decodecode
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}
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handle_line() {
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if [[ $basepath == "auto" && $vmlinux != "" ]] ; then
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module=""
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symbol="kernel_init+0x0/0x0"
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parse_symbol
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basepath=${symbol#kernel_init (}
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basepath=${basepath%/init/main.c:*)}
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fi
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local words
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# Tokenize
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read -a words <<<"$1"
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# Remove hex numbers. Do it ourselves until it happens in the
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# kernel
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# We need to know the index of the last element before we
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# remove elements because arrays are sparse
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local last=$(( ${#words[@]} - 1 ))
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for i in "${!words[@]}"; do
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# Remove the address
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if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then
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unset words[$i]
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fi
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# Format timestamps with tabs
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if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
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unset words[$i]
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words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
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fi
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done
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if [[ ${words[$last]} =~ ^[0-9a-f]+\] ]]; then
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words[$last-1]="${words[$last-1]} ${words[$last]}"
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unset words[$last]
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last=$(( $last - 1 ))
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fi
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if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
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module=${words[$last]}
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module=${module#\[}
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module=${module%\]}
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modbuildid=${module#* }
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module=${module% *}
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if [[ $modbuildid == $module ]]; then
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modbuildid=
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fi
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symbol=${words[$last-1]}
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unset words[$last-1]
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else
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# The symbol is the last element, process it
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symbol=${words[$last]}
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module=
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modbuildid=
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fi
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unset words[$last]
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parse_symbol # modifies $symbol
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# Add up the line number to the symbol
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echo "${words[@]}" "$symbol $module"
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}
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while read line; do
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# Let's see if we have an address in the line
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if [[ $line =~ \[\<([^]]+)\>\] ]] ||
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[[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then
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# Translate address to line numbers
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handle_line "$line"
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# Is it a code line?
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elif [[ $line == *Code:* ]]; then
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decode_code "$line"
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# Is it a version line?
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elif [[ -n $debuginfod && $line =~ PID:\ [0-9]+\ Comm: ]]; then
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debuginfod_get_vmlinux "$line"
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else
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# Nothing special in this line, show it as is
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echo "$line"
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fi
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done
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