1#!/bin/bash 2# (c) 2014, Sasha Levin <sasha.levin@oracle.com> 3#set -x 4 5if [[ $# != 2 ]]; then 6 echo "Usage:" 7 echo " $0 [vmlinux] [base path]" 8 exit 1 9fi 10 11vmlinux=$1 12basepath=$2 13declare -A cache 14 15parse_symbol() { 16 # The structure of symbol at this point is: 17 # ([name]+[offset]/[total length]) 18 # 19 # For example: 20 # do_basic_setup+0x9c/0xbf 21 22 # Remove the englobing parenthesis 23 symbol=${symbol#\(} 24 symbol=${symbol%\)} 25 26 # Strip the symbol name so that we could look it up 27 local name=${symbol%+*} 28 29 # Use 'nm vmlinux' to figure out the base address of said symbol. 30 # It's actually faster to call it every time than to load it 31 # all into bash. 32 if [[ "${cache[$name]+isset}" == "isset" ]]; then 33 local base_addr=${cache[$name]} 34 else 35 local base_addr=$(nm "$vmlinux" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1) 36 cache["$name"]="$base_addr" 37 fi 38 # Let's start doing the math to get the exact address into the 39 # symbol. First, strip out the symbol total length. 40 local expr=${symbol%/*} 41 42 # Now, replace the symbol name with the base address we found 43 # before. 44 expr=${expr/$name/0x$base_addr} 45 46 # Evaluate it to find the actual address 47 expr=$((expr)) 48 local address=$(printf "%x\n" "$expr") 49 50 # Pass it to addr2line to get filename and line number 51 # Could get more than one result 52 if [[ "${cache[$address]+isset}" == "isset" ]]; then 53 local code=${cache[$address]} 54 else 55 local code=$(addr2line -i -e "$vmlinux" "$address") 56 cache[$address]=$code 57 fi 58 59 # addr2line doesn't return a proper error code if it fails, so 60 # we detect it using the value it prints so that we could preserve 61 # the offset/size into the function and bail out 62 if [[ $code == "??:0" ]]; then 63 return 64 fi 65 66 # Strip out the base of the path 67 code=${code//$basepath/""} 68 69 # In the case of inlines, move everything to same line 70 code=${code//$'\n'/' '} 71 72 # Replace old address with pretty line numbers 73 symbol="$name ($code)" 74} 75 76decode_code() { 77 local scripts=`dirname "${BASH_SOURCE[0]}"` 78 79 echo "$1" | $scripts/decodecode 80} 81 82handle_line() { 83 local words 84 85 # Tokenize 86 read -a words <<<"$1" 87 88 # Remove hex numbers. Do it ourselves until it happens in the 89 # kernel 90 91 # We need to know the index of the last element before we 92 # remove elements because arrays are sparse 93 local last=$(( ${#words[@]} - 1 )) 94 95 for i in "${!words[@]}"; do 96 # Remove the address 97 if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then 98 unset words[$i] 99 fi 100 101 # Format timestamps with tabs 102 if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then 103 unset words[$i] 104 words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}") 105 fi 106 done 107 108 # The symbol is the last element, process it 109 symbol=${words[$last]} 110 unset words[$last] 111 parse_symbol # modifies $symbol 112 113 # Add up the line number to the symbol 114 echo "${words[@]}" "$symbol" 115} 116 117while read line; do 118 # Let's see if we have an address in the line 119 if [[ $line =~ \[\<([^]]+)\>\] ]]; then 120 # Translate address to line numbers 121 handle_line "$line" 122 # Is it a code line? 123 elif [[ $line == *Code:* ]]; then 124 decode_code "$line" 125 else 126 # Nothing special in this line, show it as is 127 echo "$line" 128 fi 129done 130