projects/linux·blob v4.0-rc4 · refs

126 lines · 3.0 KiB

1#!/bin/bash
2# (c) 2014, Sasha Levin <[email protected]>
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