OSCL-LXR linux-6.0.1/​scripts/​decode_stacktrace.sh	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
 # (c) 2014, Sasha Levin <sasha.levin@oracle.com>
 #set -x
 
 usage() {
         echo "Usage:"
         echo "  $0 -r <release> | <vmlinux> [<base path>|auto] [<modules path>]"
 }
 
 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
         fi
 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}
         fi
 
         if [[ $vmlinux == "" && -z $debuginfod ]] ; then
                 echo "ERROR! vmlinux image must be specified" >&2
                 usage
                 exit 1
         fi
 fi
 
 declare aarray_support=true
 declare -A cache 2>/dev/null
 if [[ $? != 0 ]]; then
         aarray_support=false
 else
         declare -A modcache
 fi
 
 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 [[ "$modpath" != "" ]] ; then
                 for fn in $(find "$modpath" -name "${module//_/[-_]}.ko*") ; do
                         if readelf -WS "$fn" | grep -qwF .debug_line ; then
                                 echo $fn
                                 return
                         fi
                 done
                 return 1
         fi
 
         modpath=$(dirname "$vmlinux")
         find_module && return
 
         if [[ $release == "" ]] ; then
                 release=$(gdb -ex 'print init_uts_ns.name.release' -ex 'quit' -quiet -batch "$vmlinux" 2>/dev/null | sed -n 's/\$1 = "\(.*\)".*/\1/p')
         fi
 
         for dn in {/usr/lib/debug,}/lib/modules/$release ; do
                 if [ -e "$dn" ] ; then
                         modpath="$dn"
                         find_module && return
                 fi
         done
 
         modpath=""
         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
                         echo "WARNING! Modules path isn't set, but is needed to parse this symbol" >&2
                         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%/*}
 
         # 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
         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,$address]}
         else
                 local code=$(${CROSS_COMPILE}addr2line -i -e "$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'/' '}
 
         # 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]}"`
 
         echo "$1" | $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
 
         # Tokenize
         read -a words <<<"$1"
 
         # 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]
                 fi
 
                 # Format timestamps with tabs
                 if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
                         unset words[$i]
                         words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
                 fi
         done
 
         if [[ ${words[$last]} =~ ^[0-9a-f]+\] ]]; then
                 words[$last-1]="${words[$last-1]} ${words[$last]}"
                 unset words[$last]
                 last=$(( $last - 1 ))
         fi
 
         if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
                 module=${words[$last]}
                 module=${module#\[}
                 module=${module%\]}
                 modbuildid=${module#* }
                 module=${module% *}
                 if [[ $modbuildid == $module ]]; then
                         modbuildid=
                 fi
                 symbol=${words[$last-1]}
                 unset words[$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
         echo "${words[@]}" "$symbol $module"
 }
 
 while read line; do
         # 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"
         fi
 done

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