126 lines
3 KiB
Bash
Executable file
126 lines
3 KiB
Bash
Executable file
#!/bin/bash
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# (c) 2014, Sasha Levin <sasha.levin@oracle.com>
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#set -x
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if [[ $# != 2 ]]; then
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echo "Usage:"
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echo " $0 [vmlinux] [base path]"
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exit 1
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fi
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vmlinux=$1
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basepath=$2
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declare -A cache
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parse_symbol() {
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# The structure of symbol at this point is:
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# [name]+[offset]/[total length]
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#
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# For example:
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# do_basic_setup+0x9c/0xbf
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# Strip the symbol name so that we could look it up
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local name=${symbol%+*}
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# Use 'nm vmlinux' to figure out the base address of said symbol.
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# It's actually faster to call it every time than to load it
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# all into bash.
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if [[ "${cache[$name]+isset}" == "isset" ]]; then
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local base_addr=${cache[$name]}
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else
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local base_addr=$(nm "$vmlinux" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
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cache["$name"]="$base_addr"
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fi
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# Let's start doing the math to get the exact address into the
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# symbol. First, strip out the symbol total length.
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local expr=${symbol%/*}
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# Now, replace the symbol name with the base address we found
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# before.
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expr=${expr/$name/0x$base_addr}
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# Evaluate it to find the actual address
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expr=$((expr))
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local address=$(printf "%x\n" "$expr")
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# Pass it to addr2line to get filename and line number
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# Could get more than one result
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if [[ "${cache[$address]+isset}" == "isset" ]]; then
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local code=${cache[$address]}
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else
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local code=$(addr2line -i -e "$vmlinux" "$address")
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cache[$address]=$code
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fi
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# addr2line doesn't return a proper error code if it fails, so
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# we detect it using the value it prints so that we could preserve
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# the offset/size into the function and bail out
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if [[ $code == "??:0" ]]; then
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return
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fi
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# Strip out the base of the path
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code=${code//$basepath/""}
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# In the case of inlines, move everything to same line
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code=${code//$'\n'/' '}
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# Replace old address with pretty line numbers
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symbol="$name ($code)"
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}
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decode_code() {
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local scripts=`dirname "${BASH_SOURCE[0]}"`
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echo "$1" | $scripts/decodecode
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}
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handle_line() {
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local words
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# Tokenize
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read -a words <<<"$1"
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# Remove hex numbers. Do it ourselves until it happens in the
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# kernel
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# We need to know the index of the last element before we
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# remove elements because arrays are sparse
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local last=$(( ${#words[@]} - 1 ))
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for i in "${!words[@]}"; do
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# Remove the address
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if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then
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unset words[$i]
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fi
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# Format timestamps with tabs
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if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
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unset words[$i]
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words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
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fi
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done
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# The symbol is the last element, process it
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symbol=${words[$last]}
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unset words[$last]
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parse_symbol # modifies $symbol
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# Add up the line number to the symbol
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echo "${words[@]}" "$symbol"
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}
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while read line; do
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# Let's see if we have an address in the line
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if [[ $line =~ \[\<([^]]+)\>\] ]]; then
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# Translate address to line numbers
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handle_line "$line"
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# Is it a code line?
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elif [[ $line == *Code:* ]]; then
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decode_code "$line"
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else
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# Nothing special in this line, show it as is
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echo "$line"
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fi
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done
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