Output section attributes
-------------------------
We showed above that the full description of an output section looked
like this:
SECTION [ADDRESS] [(TYPE)] : [AT(LMA)]
{
OUTPUT-SECTION-COMMAND
OUTPUT-SECTION-COMMAND
...
} [>REGION] [AT>LMA_REGION] [:PHDR :PHDR ...] [=FILLEXP]
We've already described SECTION, ADDRESS, and
OUTPUT-SECTION-COMMAND. In this section we will describe the remaining
section attributes.