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