#!/bin/sh

OBJ=$1
SYM=$2

if test -z "${OBJ}" -o -z "${SYM}" ; then
	echo "syntax:"
	echo "\t$0 module symbol[+offset]"
	echo "example:"
	echo "\t$0 driver.o bad_bad_symbol+0x8b"
	exit 1
fi

OFS=$(echo $SYM | grep '+' | sed -e 's/^.*+//;')
SYM=$(echo $SYM | sed -e 's/+.*$//;')

if ! test -r ${OBJ} ; then
	echo "module '${OBJ}' cannot be read" >&2
	exit 1
fi

range=$(objdump -t ${OBJ} | grep '\.text' | sort | grep -A2 ${SYM} | \
	cut -d ' ' -f 1 | xargs)

if ! (echo ${range} | grep "[0-9a-fA-F]\+ [0-9a-fA-F]\+" > /dev/null) ; then
	echo "cannot find symbol ${SYM} in ${OBJ}; range='${range}'" >&2
	exit 1
fi

start=$(echo ${range} | tr ' ' '\n' | head -n1)
stop=$(echo ${range} | tr ' ' '\n' | tail -n1)
options="--start-address=0x$start --stop-address=0x$stop"

offset=$(echo ${OFS} ${range} | (read a b c ; echo $a 0x$b))
offset=$(echo ${offset} | xargs printf "%d+%d")
offset=$(echo ${offset} | bc | xargs printf "%x")

cmd="objdump -S ${OBJ} ${options}"

echo ">>> ${OBJ} ${SYM} +${OFS} ${offset} <<<"
echo ">>> $cmd <<<"

$cmd | sed -e "s/^  \( *${offset}:.*\)$/->\1      ******/;"