as.info: Struct

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`.struct EXPRESSION'

   Switch to the absolute section, and set the section offset to
EXPRESSION, which must be an absolute expression.  You might use this
as follows:
             .struct 0
     field1:
             .struct field1 + 4
     field2:
             .struct field2 + 4
     field3:
   This would define the symbol `field1' to have the value 0, the symbol
`field2' to have the value 4, and the symbol `field3' to have the value
8.  Assembly would be left in the absolute section, and you would need
to use a `.section' directive of some sort to change to some other
section before further assembly.