projects/linux·blob v5.10-rc4 · refs

225 lines · 5.2 KiB

1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3# (c) 2014, Sasha Levin <[email protected]>
4#set -x
5
6if [[ $# < 1 ]]; then
7 echo "Usage:"
8 echo " $0 -r <release> | <vmlinux> [base path] [modules path]"
9 exit 1
10fi
11
12if [[ $1 == "-r" ]] ; then
13 vmlinux=""
14 basepath="auto"
15 modpath=""
16 release=$2
17
18 for fn in {,/usr/lib/debug}/boot/vmlinux-$release{,.debug} /lib/modules/$release{,/build}/vmlinux ; do
19 if [ -e "$fn" ] ; then
20 vmlinux=$fn
21 break
22 fi
23 done
24
25 if [[ $vmlinux == "" ]] ; then
26 echo "ERROR! vmlinux image for release $release is not found" >&2
27 exit 2
28 fi
29else
30 vmlinux=$1
31 basepath=${2-auto}
32 modpath=$3
33 release=""
34fi
35
36declare -A cache
37declare -A modcache
38
39find_module() {
40 if [[ "$modpath" != "" ]] ; then
41 for fn in $(find "$modpath" -name "${module//_/[-_]}.ko*") ; do
42 if readelf -WS "$fn" | grep -qwF .debug_line ; then
43 echo $fn
44 return
45 fi
46 done
47 return 1
48 fi
49
50 modpath=$(dirname "$vmlinux")
51 find_module && return
52
53 if [[ $release == "" ]] ; then
54 release=$(gdb -ex 'print init_uts_ns.name.release' -ex 'quit' -quiet -batch "$vmlinux" | sed -n 's/\$1 = "\(.*\)".*/\1/p')
55 fi
56
57 for dn in {/usr/lib/debug,}/lib/modules/$release ; do
58 if [ -e "$dn" ] ; then
59 modpath="$dn"
60 find_module && return
61 fi
62 done
63
64 modpath=""
65 return 1
66}
67
68parse_symbol() {
69 # The structure of symbol at this point is:
70 # ([name]+[offset]/[total length])
71 #
72 # For example:
73 # do_basic_setup+0x9c/0xbf
74
75 if [[ $module == "" ]] ; then
76 local objfile=$vmlinux
77 elif [[ "${modcache[$module]+isset}" == "isset" ]]; then
78 local objfile=${modcache[$module]}
79 else
80 local objfile=$(find_module)
81 if [[ $objfile == "" ]] ; then
82 echo "WARNING! Modules path isn't set, but is needed to parse this symbol" >&2
83 return
84 fi
85 modcache[$module]=$objfile
86 fi
87
88 # Remove the englobing parenthesis
89 symbol=${symbol#\(}
90 symbol=${symbol%\)}
91
92 # Strip segment
93 local segment
94 if [[ $symbol == *:* ]] ; then
95 segment=${symbol%%:*}:
96 symbol=${symbol#*:}
97 fi
98
99 # Strip the symbol name so that we could look it up
100 local name=${symbol%+*}
101
102 # Use 'nm vmlinux' to figure out the base address of said symbol.
103 # It's actually faster to call it every time than to load it
104 # all into bash.
105 if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
106 local base_addr=${cache[$module,$name]}
107 else
108 local base_addr=$(nm "$objfile" | awk '$3 == "'$name'" && ($2 == "t" || $2 == "T") {print $1; exit}')
109 if [[ $base_addr == "" ]] ; then
110 # address not found
111 return
112 fi
113 cache[$module,$name]="$base_addr"
114 fi
115 # Let's start doing the math to get the exact address into the
116 # symbol. First, strip out the symbol total length.
117 local expr=${symbol%/*}
118
119 # Now, replace the symbol name with the base address we found
120 # before.
121 expr=${expr/$name/0x$base_addr}
122
123 # Evaluate it to find the actual address
124 expr=$((expr))
125 local address=$(printf "%x\n" "$expr")
126
127 # Pass it to addr2line to get filename and line number
128 # Could get more than one result
129 if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then
130 local code=${cache[$module,$address]}
131 else
132 local code=$(${CROSS_COMPILE}addr2line -i -e "$objfile" "$address")
133 cache[$module,$address]=$code
134 fi
135
136 # addr2line doesn't return a proper error code if it fails, so
137 # we detect it using the value it prints so that we could preserve
138 # the offset/size into the function and bail out
139 if [[ $code == "??:0" ]]; then
140 return
141 fi
142
143 # Strip out the base of the path on each line
144 code=$(while read -r line; do echo "${line#$basepath/}"; done <<< "$code")
145
146 # In the case of inlines, move everything to same line
147 code=${code//$'\n'/' '}
148
149 # Replace old address with pretty line numbers
150 symbol="$segment$name ($code)"
151}
152
153decode_code() {
154 local scripts=`dirname "${BASH_SOURCE[0]}"`
155
156 echo "$1" | $scripts/decodecode
157}
158
159handle_line() {
160 local words
161
162 # Tokenize
163 read -a words <<<"$1"
164
165 # Remove hex numbers. Do it ourselves until it happens in the
166 # kernel
167
168 # We need to know the index of the last element before we
169 # remove elements because arrays are sparse
170 local last=$(( ${#words[@]} - 1 ))
171
172 for i in "${!words[@]}"; do
173 # Remove the address
174 if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then
175 unset words[$i]
176 fi
177
178 # Format timestamps with tabs
179 if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
180 unset words[$i]
181 words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
182 fi
183 done
184
185 if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
186 module=${words[$last]}
187 module=${module#\[}
188 module=${module%\]}
189 symbol=${words[$last-1]}
190 unset words[$last-1]
191 else
192 # The symbol is the last element, process it
193 symbol=${words[$last]}
194 module=
195 fi
196
197 unset words[$last]
198 parse_symbol # modifies $symbol
199
200 # Add up the line number to the symbol
201 echo "${words[@]}" "$symbol $module"
202}
203
204if [[ $basepath == "auto" ]] ; then
205 module=""
206 symbol="kernel_init+0x0/0x0"
207 parse_symbol
208 basepath=${symbol#kernel_init (}
209 basepath=${basepath%/init/main.c:*)}
210fi
211
212while read line; do
213 # Let's see if we have an address in the line
214 if [[ $line =~ \[\<([^]]+)\>\] ]] ||
215 [[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then
216 # Translate address to line numbers
217 handle_line "$line"
218 # Is it a code line?
219 elif [[ $line == *Code:* ]]; then
220 decode_code "$line"
221 else
222 # Nothing special in this line, show it as is
223 echo "$line"
224 fi
225done