x86/platform/uv: Update for UV5 NMI MMR changes
[linux-2.6-microblaze.git] / scripts / decode_stacktrace.sh
1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0
3 # (c) 2014, Sasha Levin <sasha.levin@oracle.com>
4 #set -x
5
6 if [[ $# < 1 ]]; then
7         echo "Usage:"
8         echo "  $0 -r <release> | <vmlinux> [base path] [modules path]"
9         exit 1
10 fi
11
12 if [[ $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
29 else
30         vmlinux=$1
31         basepath=${2-auto}
32         modpath=$3
33         release=""
34 fi
35
36 declare -A cache
37 declare -A modcache
38
39 find_module() {
40         if [[ "$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
68 parse_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
153 decode_code() {
154         local scripts=`dirname "${BASH_SOURCE[0]}"`
155
156         echo "$1" | $scripts/decodecode
157 }
158
159 handle_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
204 if [[ $basepath == "auto" ]] ; then
205         module=""
206         symbol="kernel_init+0x0/0x0"
207         parse_symbol
208         basepath=${symbol#kernel_init (}
209         basepath=${basepath%/init/main.c:*)}
210 fi
211
212 while 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
225 done