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32 results

btree.c

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  • decode_stacktrace.sh 3.71 KiB
    #!/bin/bash
    # (c) 2014, Sasha Levin <sasha.levin@oracle.com>
    #set -x
    
    if [[ $# < 2 ]]; then
    	echo "Usage:"
    	echo "	$0 [vmlinux] [base path] [modules path]"
    	exit 1
    fi
    
    vmlinux=$1
    basepath=$2
    modpath=$3
    declare -A cache
    declare -A modcache
    
    parse_symbol() {
    	# The structure of symbol at this point is:
    	#   ([name]+[offset]/[total length])
    	#
    	# For example:
    	#   do_basic_setup+0x9c/0xbf
    
    	if [[ $module == "" ]] ; then
    		local objfile=$vmlinux
    	elif [[ "${modcache[$module]+isset}" == "isset" ]]; then
    		local objfile=${modcache[$module]}
    	else
    		[[ $modpath == "" ]] && return
    		local objfile=$(find "$modpath" -name $module.ko -print -quit)
    		[[ $objfile == "" ]] && return
    		modcache[$module]=$objfile
    	fi
    
    	# Remove the englobing parenthesis
    	symbol=${symbol#\(}
    	symbol=${symbol%\)}
    
    	# Strip the symbol name so that we could look it up
    	local name=${symbol%+*}
    
    	# Use 'nm vmlinux' to figure out the base address of said symbol.
    	# It's actually faster to call it every time than to load it
    	# all into bash.
    	if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
    		local base_addr=${cache[$module,$name]}
    	else
    		local base_addr=$(nm "$objfile" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
    		cache[$module,$name]="$base_addr"
    	fi
    	# Let's start doing the math to get the exact address into the
    	# symbol. First, strip out the symbol total length.
    	local expr=${symbol%/*}
    
    	# Now, replace the symbol name with the base address we found
    	# before.
    	expr=${expr/$name/0x$base_addr}
    
    	# Evaluate it to find the actual address
    	expr=$((expr))
    	local address=$(printf "%x\n" "$expr")
    
    	# Pass it to addr2line to get filename and line number
    	# Could get more than one result
    	if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then
    		local code=${cache[$module,$address]}
    	else
    		local code=$(addr2line -i -e "$objfile" "$address")
    		cache[$module,$address]=$code
    	fi
    
    	# addr2line doesn't return a proper error code if it fails, so
    	# we detect it using the value it prints so that we could preserve
    	# the offset/size into the function and bail out
    	if [[ $code == "??:0" ]]; then
    		return
    	fi
    
    	# Strip out the base of the path
    	code=${code//$basepath/""}
    
    	# In the case of inlines, move everything to same line
    	code=${code//$'\n'/' '}
    
    	# Replace old address with pretty line numbers
    	symbol="$name ($code)"
    }
    
    decode_code() {
    	local scripts=`dirname "${BASH_SOURCE[0]}"`
    
    	echo "$1" | $scripts/decodecode
    }
    
    handle_line() {
    	local words
    
    	# Tokenize
    	read -a words <<<"$1"
    
    	# Remove hex numbers. Do it ourselves until it happens in the
    	# kernel
    
    	# We need to know the index of the last element before we
    	# remove elements because arrays are sparse
    	local last=$(( ${#words[@]} - 1 ))
    
    	for i in "${!words[@]}"; do
    		# Remove the address
    		if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then
    			unset words[$i]
    		fi
    
    		# Format timestamps with tabs
    		if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
    			unset words[$i]
    			words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
    		fi
    	done
    
    	if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
    		module=${words[$last]}
    		module=${module#\[}
    		module=${module%\]}
    		symbol=${words[$last-1]}
    		unset words[$last-1]
    	else
    		# The symbol is the last element, process it
    		symbol=${words[$last]}
    		module=
    	fi
    
    	unset words[$last]
    	parse_symbol # modifies $symbol
    
    	# Add up the line number to the symbol
    	echo "${words[@]}" "$symbol $module"
    }
    
    while read line; do
    	# Let's see if we have an address in the line
    	if [[ $line =~ \[\<([^]]+)\>\] ]] ||
    	   [[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then
    		# Translate address to line numbers
    		handle_line "$line"
    	# Is it a code line?
    	elif [[ $line == *Code:* ]]; then
    		decode_code "$line"
    	else
    		# Nothing special in this line, show it as is
    		echo "$line"
    	fi
    done