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		if [[ $modpath == "" ]]; then
31			echo "WARNING! Modules path isn't set, but is needed to parse this symbol" >&2
32			return
33		fi
34		local objfile=$(find "$modpath" -name "${module//_/[-_]}.ko*" -print -quit)
35		[[ $objfile == "" ]] && return
36		modcache[$module]=$objfile
37	fi
38
39	# Remove the englobing parenthesis
40	symbol=${symbol#\(}
41	symbol=${symbol%\)}
42
43	# Strip segment
44	local segment
45	if [[ $symbol == *:* ]] ; then
46		segment=${symbol%%:*}:
47		symbol=${symbol#*:}
48	fi
49
50	# Strip the symbol name so that we could look it up
51	local name=${symbol%+*}
52
53	# Use 'nm vmlinux' to figure out the base address of said symbol.
54	# It's actually faster to call it every time than to load it
55	# all into bash.
56	if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
57		local base_addr=${cache[$module,$name]}
58	else
59		local base_addr=$(nm "$objfile" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
60		cache[$module,$name]="$base_addr"
61	fi
62	# Let's start doing the math to get the exact address into the
63	# symbol. First, strip out the symbol total length.
64	local expr=${symbol%/*}
65
66	# Now, replace the symbol name with the base address we found
67	# before.
68	expr=${expr/$name/0x$base_addr}
69
70	# Evaluate it to find the actual address
71	expr=$((expr))
72	local address=$(printf "%x\n" "$expr")
73
74	# Pass it to addr2line to get filename and line number
75	# Could get more than one result
76	if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then
77		local code=${cache[$module,$address]}
78	else
79		local code=$(${CROSS_COMPILE}addr2line -i -e "$objfile" "$address")
80		cache[$module,$address]=$code
81	fi
82
83	# addr2line doesn't return a proper error code if it fails, so
84	# we detect it using the value it prints so that we could preserve
85	# the offset/size into the function and bail out
86	if [[ $code == "??:0" ]]; then
87		return
88	fi
89
90	# Strip out the base of the path on each line
91	code=$(while read -r line; do echo "${line#$basepath/}"; done <<< "$code")
92
93	# In the case of inlines, move everything to same line
94	code=${code//$'\n'/' '}
95
96	# Replace old address with pretty line numbers
97	symbol="$segment$name ($code)"
98}
99
100decode_code() {
101	local scripts=`dirname "${BASH_SOURCE[0]}"`
102
103	echo "$1" | $scripts/decodecode
104}
105
106handle_line() {
107	local words
108
109	# Tokenize
110	read -a words <<<"$1"
111
112	# Remove hex numbers. Do it ourselves until it happens in the
113	# kernel
114
115	# We need to know the index of the last element before we
116	# remove elements because arrays are sparse
117	local last=$(( ${#words[@]} - 1 ))
118
119	for i in "${!words[@]}"; do
120		# Remove the address
121		if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then
122			unset words[$i]
123		fi
124
125		# Format timestamps with tabs
126		if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
127			unset words[$i]
128			words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
129		fi
130	done
131
132	if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
133		module=${words[$last]}
134		module=${module#\[}
135		module=${module%\]}
136		symbol=${words[$last-1]}
137		unset words[$last-1]
138	else
139		# The symbol is the last element, process it
140		symbol=${words[$last]}
141		module=
142	fi
143
144	unset words[$last]
145	parse_symbol # modifies $symbol
146
147	# Add up the line number to the symbol
148	echo "${words[@]}" "$symbol $module"
149}
150
151while read line; do
152	# Let's see if we have an address in the line
153	if [[ $line =~ \[\<([^]]+)\>\] ]] ||
154	   [[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then
155		# Translate address to line numbers
156		handle_line "$line"
157	# Is it a code line?
158	elif [[ $line == *Code:* ]]; then
159		decode_code "$line"
160	else
161		# Nothing special in this line, show it as is
162		echo "$line"
163	fi
164done
165