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The Location Counter

The special linker variable dot `.' always contains the current output location counter. Since the . always refers to a location in an output section, it must always appear in an expression within a SECTIONS command. The . symbol may appear anywhere that an ordinary symbol is allowed in an expression, but its assignments have a side effect. Assigning a value to the . symbol will cause the location counter to be moved. This may be used to create holes in the output section. The location counter may never be moved backwards.
SECTIONS
{
  output :
  {
  file1(.text)
  . = . + 1000;
  file2(.text)
  . += 1000;
  file3(.text)
  } = 0x1234;
}
In the previous example, file1 is located at the beginning of the output section, then there is a 1000 byte gap. Then file2 appears, also with a 1000 byte gap following before file3 is loaded. The notation `= 0x1234' specifies what data to write in the gaps (see section Optional Section Attributes).


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