123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225 |
- #!/bin/bash
- # SPDX-License-Identifier: GPL-2.0
- # (c) 2014, Sasha Levin <sasha.levin@oracle.com>
- #set -x
- if [[ $# < 1 ]]; then
- echo "Usage:"
- echo " $0 -r <release> | <vmlinux> [base path] [modules path]"
- exit 1
- fi
- 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
- exit 2
- fi
- else
- vmlinux=$1
- basepath=${2-auto}
- modpath=$3
- release=""
- fi
- declare -A cache
- declare -A modcache
- find_module() {
- if [[ "$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" | 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 [[ "${modcache[$module]+isset}" == "isset" ]]; then
- local objfile=${modcache[$module]}
- else
- local objfile=$(find_module)
- if [[ $objfile == "" ]] ; then
- echo "WARNING! Modules path isn't set, but is needed to parse this symbol" >&2
- return
- fi
- modcache[$module]=$objfile
- fi
- # Remove the englobing parenthesis
- symbol=${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 [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
- local base_addr=${cache[$module,$name]}
- else
- local base_addr=$(nm "$objfile" | awk '$3 == "'$name'" && ($2 == "t" || $2 == "T") {print $1; exit}')
- if [[ $base_addr == "" ]] ; then
- # address not found
- return
- fi
- cache[$module,$name]="$base_addr"
- 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" "$expr")
- # Pass it to addr2line to get filename and line number
- # Could get more than one result
- if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then
- local code=${cache[$module,$address]}
- else
- local code=$(${CROSS_COMPILE}addr2line -i -e "$objfile" "$address")
- cache[$module,$address]=$code
- 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)"
- }
- decode_code() {
- local scripts=`dirname "${BASH_SOURCE[0]}"`
- echo "$1" | $scripts/decodecode
- }
- handle_line() {
- 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]} =~ \[([^]]+)\] ]]; then
- module=${words[$last]}
- module=${module#\[}
- module=${module%\]}
- symbol=${words[$last-1]}
- unset words[$last-1]
- else
- # The symbol is the last element, process it
- symbol=${words[$last]}
- module=
- fi
- unset words[$last]
- parse_symbol # modifies $symbol
- # Add up the line number to the symbol
- echo "${words[@]}" "$symbol $module"
- }
- if [[ $basepath == "auto" ]] ; then
- module=""
- symbol="kernel_init+0x0/0x0"
- parse_symbol
- basepath=${symbol#kernel_init (}
- basepath=${basepath%/init/main.c:*)}
- fi
- 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"
- else
- # Nothing special in this line, show it as is
- echo "$line"
- fi
- done
|