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proc far and near. What is it mean?
- Thread starter edgarasm
- Start date
There are two types of CALLS and JMPS in 16-bit assembly: near and far.
Near contains a 16-bit offset. For calls it will save the IP only.
Far contains a segment and a 16-bit offset. For calls it will save IP and CS.
Defining a proc as FAR tells the assembler that all Calls to that proc must give both a segment and a 16-bit offset. The upshot of this is that the FAR Call will save both IP and CS. There are two variants of RET: RETN and RETF. One will pull off IP and the other will pull of BOTH IP AND CS. Go figure which one, okay?
"Information has a tendency to be free. Which means someone will always tell you something you don't want to know."
Near contains a 16-bit offset. For calls it will save the IP only.
Far contains a segment and a 16-bit offset. For calls it will save IP and CS.
Defining a proc as FAR tells the assembler that all Calls to that proc must give both a segment and a 16-bit offset. The upshot of this is that the FAR Call will save both IP and CS. There are two variants of RET: RETN and RETF. One will pull off IP and the other will pull of BOTH IP AND CS. Go figure which one, okay?
"Information has a tendency to be free. Which means someone will always tell you something you don't want to know."
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