Dump all called functions using gdb.

dump-called.sh

program=$1;
tmp=$(mktemp);
readelf -s $program | awk '
{
  if($4 == "FUNC" && $2 != 0) {
    print "# code for " $NF;
    print "b *0x" $2;
    print "commands";
    print "silent";
    print "bt 1";
    print "c";
    print "end";
    print "";
  }
}' > $tmp;

# usage
echo "usage:"
echo "> gdb --command=$tmp ./$program";