projects/linux·blob v5.3-rc4 · refs

161 lines · 3.9 KiB

1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3# (c) 2014, Sasha Levin <[email protected]>
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 segment
41 local segment
42 if [[ $symbol == *:* ]] ; then
43 segment=${symbol%%:*}:
44 symbol=${symbol#*:}
45 fi
46
47 # Strip the symbol name so that we could look it up
48 local name=${symbol%+*}
49
50 # Use 'nm vmlinux' to figure out the base address of said symbol.
51 # It's actually faster to call it every time than to load it
52 # all into bash.
53 if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
54 local base_addr=${cache[$module,$name]}
55 else
56 local base_addr=$(nm "$objfile" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
57 cache[$module,$name]="$base_addr"
58 fi
59 # Let's start doing the math to get the exact address into the
60 # symbol. First, strip out the symbol total length.
61 local expr=${symbol%/*}
62
63 # Now, replace the symbol name with the base address we found
64 # before.
65 expr=${expr/$name/0x$base_addr}
66
67 # Evaluate it to find the actual address
68 expr=$((expr))
69 local address=$(printf "%x\n" "$expr")
70
71 # Pass it to addr2line to get filename and line number
72 # Could get more than one result
73 if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then
74 local code=${cache[$module,$address]}
75 else
76 local code=$(${CROSS_COMPILE}addr2line -i -e "$objfile" "$address")
77 cache[$module,$address]=$code
78 fi
79
80 # addr2line doesn't return a proper error code if it fails, so
81 # we detect it using the value it prints so that we could preserve
82 # the offset/size into the function and bail out
83 if [[ $code == "??:0" ]]; then
84 return
85 fi
86
87 # Strip out the base of the path
88 code=${code#$basepath/}
89
90 # In the case of inlines, move everything to same line
91 code=${code//$'\n'/' '}
92
93 # Replace old address with pretty line numbers
94 symbol="$segment$name ($code)"
95}
96
97decode_code() {
98 local scripts=`dirname "${BASH_SOURCE[0]}"`
99
100 echo "$1" | $scripts/decodecode
101}
102
103handle_line() {
104 local words
105
106 # Tokenize
107 read -a words <<<"$1"
108
109 # Remove hex numbers. Do it ourselves until it happens in the
110 # kernel
111
112 # We need to know the index of the last element before we
113 # remove elements because arrays are sparse
114 local last=$(( ${#words[@]} - 1 ))
115
116 for i in "${!words[@]}"; do
117 # Remove the address
118 if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then
119 unset words[$i]
120 fi
121
122 # Format timestamps with tabs
123 if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
124 unset words[$i]
125 words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
126 fi
127 done
128
129 if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
130 module=${words[$last]}
131 module=${module#\[}
132 module=${module%\]}
133 symbol=${words[$last-1]}
134 unset words[$last-1]
135 else
136 # The symbol is the last element, process it
137 symbol=${words[$last]}
138 module=
139 fi
140
141 unset words[$last]
142 parse_symbol # modifies $symbol
143
144 # Add up the line number to the symbol
145 echo "${words[@]}" "$symbol $module"
146}
147
148while read line; do
149 # Let's see if we have an address in the line
150 if [[ $line =~ \[\<([^]]+)\>\] ]] ||
151 [[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then
152 # Translate address to line numbers
153 handle_line "$line"
154 # Is it a code line?
155 elif [[ $line == *Code:* ]]; then
156 decode_code "$line"
157 else
158 # Nothing special in this line, show it as is
159 echo "$line"
160 fi
161done