projects/linux·blob v4.7-rc7 · refs

152 lines · 3.7 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] [modules path]"
8 exit 1
9fi
10
11vmlinux=$1
12basepath=$2
13modpath=$3
14declare -A cache
15declare -A modcache
16
17parse_symbol() {
18 # The structure of symbol at this point is:
19 # ([name]+[offset]/[total length])
20 #
21 # For example:
22 # do_basic_setup+0x9c/0xbf
23
24 if [[ $module == "" ]] ; then
25 local objfile=$vmlinux
26 elif [[ "${modcache[$module]+isset}" == "isset" ]]; then
27 local objfile=${modcache[$module]}
28 else
29 [[ $modpath == "" ]] && return
30 local objfile=$(find "$modpath" -name $module.ko -print -quit)
31 [[ $objfile == "" ]] && return
32 modcache[$module]=$objfile
33 fi
34
35 # Remove the englobing parenthesis
36 symbol=${symbol#\(}
37 symbol=${symbol%\)}
38
39 # Strip the symbol name so that we could look it up
40 local name=${symbol%+*}
41
42 # Use 'nm vmlinux' to figure out the base address of said symbol.
43 # It's actually faster to call it every time than to load it
44 # all into bash.
45 if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
46 local base_addr=${cache[$module,$name]}
47 else
48 local base_addr=$(nm "$objfile" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
49 cache[$module,$name]="$base_addr"
50 fi
51 # Let's start doing the math to get the exact address into the
52 # symbol. First, strip out the symbol total length.
53 local expr=${symbol%/*}
54
55 # Now, replace the symbol name with the base address we found
56 # before.
57 expr=${expr/$name/0x$base_addr}
58
59 # Evaluate it to find the actual address
60 expr=$((expr))
61 local address=$(printf "%x\n" "$expr")
62
63 # Pass it to addr2line to get filename and line number
64 # Could get more than one result
65 if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then
66 local code=${cache[$module,$address]}
67 else
68 local code=$(addr2line -i -e "$objfile" "$address")
69 cache[$module,$address]=$code
70 fi
71
72 # addr2line doesn't return a proper error code if it fails, so
73 # we detect it using the value it prints so that we could preserve
74 # the offset/size into the function and bail out
75 if [[ $code == "??:0" ]]; then
76 return
77 fi
78
79 # Strip out the base of the path
80 code=${code//$basepath/""}
81
82 # In the case of inlines, move everything to same line
83 code=${code//$'\n'/' '}
84
85 # Replace old address with pretty line numbers
86 symbol="$name ($code)"
87}
88
89decode_code() {
90 local scripts=`dirname "${BASH_SOURCE[0]}"`
91
92 echo "$1" | $scripts/decodecode
93}
94
95handle_line() {
96 local words
97
98 # Tokenize
99 read -a words <<<"$1"
100
101 # Remove hex numbers. Do it ourselves until it happens in the
102 # kernel
103
104 # We need to know the index of the last element before we
105 # remove elements because arrays are sparse
106 local last=$(( ${#words[@]} - 1 ))
107
108 for i in "${!words[@]}"; do
109 # Remove the address
110 if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then
111 unset words[$i]
112 fi
113
114 # Format timestamps with tabs
115 if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
116 unset words[$i]
117 words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
118 fi
119 done
120
121 if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
122 module=${words[$last]}
123 module=${module#\[}
124 module=${module%\]}
125 symbol=${words[$last-1]}
126 unset words[$last-1]
127 else
128 # The symbol is the last element, process it
129 symbol=${words[$last]}
130 module=
131 fi
132
133 unset words[$last]
134 parse_symbol # modifies $symbol
135
136 # Add up the line number to the symbol
137 echo "${words[@]}" "$symbol $module"
138}
139
140while read line; do
141 # Let's see if we have an address in the line
142 if [[ $line =~ \[\<([^]]+)\>\] ]]; then
143 # Translate address to line numbers
144 handle_line "$line"
145 # Is it a code line?
146 elif [[ $line == *Code:* ]]; then
147 decode_code "$line"
148 else
149 # Nothing special in this line, show it as is
150 echo "$line"
151 fi
152done