Dark Shikari

#!/usr/bin/perl
open(FH, "-|", "objdump", "-d", "-M", "intel", $ARGV[0]) or die "objdump failed\n";
while(<FH>){
    if(/([0-9a-f]+) <(\S+)>:/) {
        $start_addr = hex($1);
        $name = $2;
    } elsif(/^\s*([0-9a-f]+):\s+((?:[0-9a-f]{2} )+)/ and $name) {
        $end_addr = hex($1) + split(/ /, $2);
    } elsif(/^$/ and $name) {
        printf("%d %s\n", $end_addr - $start_addr, $name);
        undef $end_addr
    }
}
printf("%d %s\n", $end_addr - $start_addr, $name) if $end_addr;