1#!/bin/bash
  2# SPDX-License-Identifier: GPL-2.0
  3# (c) 2014, Sasha Levin <sasha.levin@oracle.com>
  4#set -x
  5
  6if [[ $# < 2 ]]; then
  7	echo "Usage:"
  8	echo "	$0 [vmlinux] [base path] [modules path]"
  9	exit 1
 10fi
 11
 12vmlinux=$1
 13basepath=$2
 14modpath=$3
 15declare -A cache
 16declare -A modcache
 17
 18parse_symbol() {
 19	# The structure of symbol at this point is:
 20	#   ([name]+[offset]/[total length])
 21	#
 22	# For example:
 23	#   do_basic_setup+0x9c/0xbf
 24
 25	if [[ $module == "" ]] ; then
 26		local objfile=$vmlinux
 27	elif [[ "${modcache[$module]+isset}" == "isset" ]]; then
 28		local objfile=${modcache[$module]}
 29	else
 30		[[ $modpath == "" ]] && return
 31		local objfile=$(find "$modpath" -name $module.ko -print -quit)
 32		[[ $objfile == "" ]] && return
 33		modcache[$module]=$objfile
 34	fi
 35
 36	# Remove the englobing parenthesis
 37	symbol=${symbol#\(}
 38	symbol=${symbol%\)}
 39
 40	# Strip the symbol name so that we could look it up
 41	local name=${symbol%+*}
 42
 43	# Use 'nm vmlinux' to figure out the base address of said symbol.
 44	# It's actually faster to call it every time than to load it
 45	# all into bash.
 46	if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
 47		local base_addr=${cache[$module,$name]}
 48	else
 49		local base_addr=$(nm "$objfile" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
 50		cache[$module,$name]="$base_addr"
 51	fi
 52	# Let's start doing the math to get the exact address into the
 53	# symbol. First, strip out the symbol total length.
 54	local expr=${symbol%/*}
 55
 56	# Now, replace the symbol name with the base address we found
 57	# before.
 58	expr=${expr/$name/0x$base_addr}
 59
 60	# Evaluate it to find the actual address
 61	expr=$((expr))
 62	local address=$(printf "%x\n" "$expr")
 63
 64	# Pass it to addr2line to get filename and line number
 65	# Could get more than one result
 66	if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then
 67		local code=${cache[$module,$address]}
 68	else
 69		local code=$(addr2line -i -e "$objfile" "$address")
 70		cache[$module,$address]=$code
 71	fi
 72
 73	# addr2line doesn't return a proper error code if it fails, so
 74	# we detect it using the value it prints so that we could preserve
 75	# the offset/size into the function and bail out
 76	if [[ $code == "??:0" ]]; then
 77		return
 78	fi
 79
 80	# Strip out the base of the path
 81	code=${code//$basepath/""}
 82
 83	# In the case of inlines, move everything to same line
 84	code=${code//$'\n'/' '}
 85
 86	# Replace old address with pretty line numbers
 87	symbol="$name ($code)"
 88}
 89
 90decode_code() {
 91	local scripts=`dirname "${BASH_SOURCE[0]}"`
 92
 93	echo "$1" | $scripts/decodecode
 94}
 95
 96handle_line() {
 97	local words
 98
 99	# Tokenize
100	read -a words <<<"$1"
101
102	# Remove hex numbers. Do it ourselves until it happens in the
103	# kernel
104
105	# We need to know the index of the last element before we
106	# remove elements because arrays are sparse
107	local last=$(( ${#words[@]} - 1 ))
108
109	for i in "${!words[@]}"; do
110		# Remove the address
111		if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then
112			unset words[$i]
113		fi
114
115		# Format timestamps with tabs
116		if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
117			unset words[$i]
118			words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
119		fi
120	done
121
122	if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
123		module=${words[$last]}
124		module=${module#\[}
125		module=${module%\]}
126		symbol=${words[$last-1]}
127		unset words[$last-1]
128	else
129		# The symbol is the last element, process it
130		symbol=${words[$last]}
131		module=
132	fi
133
134	unset words[$last]
135	parse_symbol # modifies $symbol
136
137	# Add up the line number to the symbol
138	echo "${words[@]}" "$symbol $module"
139}
140
141while read line; do
142	# Let's see if we have an address in the line
143	if [[ $line =~ \[\<([^]]+)\>\] ]] ||
144	   [[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then
145		# Translate address to line numbers
146		handle_line "$line"
147	# Is it a code line?
148	elif [[ $line == *Code:* ]]; then
149		decode_code "$line"
150	else
151		# Nothing special in this line, show it as is
152		echo "$line"
153	fi
154done