ld.info: Output Section Description

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Output section description

   The full description of an output section looks like this:
     SECTION [ADDRESS] [(TYPE)] : [AT(LMA)]
       {
         OUTPUT-SECTION-COMMAND
         OUTPUT-SECTION-COMMAND
         ...
       } [>REGION] [AT>LMA_REGION] [:PHDR :PHDR ...] [=FILLEXP]
   Most output sections do not use most of the optional section
attributes.
   The whitespace around SECTION is required, so that the section name
is unambiguous.  The colon and the curly braces are also required.  The
line breaks and other white space are optional.
   Each OUTPUT-SECTION-COMMAND may be one of the following:
   * a symbol assignment (*note Assignments::)
   * an input section description (*note Input Section::)
   * data values to include directly (*note Output Section Data::)
   * a special output section keyword (*note Output Section Keywords::)