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Linux/scripts/decode_stacktrace.sh

  1 #!/bin/bash
  2 # (c) 2014, Sasha Levin <sasha.levin@oracle.com>
  3 #set -x
  4 
  5 if [[ $# < 2 ]]; then
  6         echo "Usage:"
  7         echo "  $0 [vmlinux] [base path] [modules path]"
  8         exit 1
  9 fi
 10 
 11 vmlinux=$1
 12 basepath=$2
 13 modpath=$3
 14 declare -A cache
 15 declare -A modcache
 16 
 17 parse_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 ($code)"
 87 }
 88 
 89 decode_code() {
 90         local scripts=`dirname "${BASH_SOURCE[0]}"`
 91 
 92         echo "$1" | $scripts/decodecode
 93 }
 94 
 95 handle_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 
140 while read line; do
141         # Let's see if we have an address in the line
142         if [[ $line =~ \[\<([^]]+)\>\] ]] ||
143            [[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then
144                 # Translate address to line numbers
145                 handle_line "$line"
146         # Is it a code line?
147         elif [[ $line == *Code:* ]]; then
148                 decode_code "$line"
149         else
150                 # Nothing special in this line, show it as is
151                 echo "$line"
152         fi
153 done

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