Intel 121748-001 manual F11, F21, Frame

8886 Object Module Formats Verslon 4.8

(FSd) The TARGET is specified with an explicit

FRAME NUMBER: in this case the FRAME is determined as in (F3) above.

(F6) No X. There is no FRAME. This is a way to indicate to

R&L that an 8089 self-relative reference is to be processed. A siqned displacement between the LOCATION 20-bit address and the TARGET 20-bit address must be computed.

Nomenclature describing FRAME's is similar		to the	above
nomenclature	for TARGET's, viz:
FRAME:	SI«seqment name»	[FA1
FRAME:	GI«group name»	[F11
FRAME:	EI«symbol name»	[F21
FRAME:	<FRAME NUMB~R>	[F3]
FRAME:	LOCATION	{F41
FRAME:	TARGET	[F51
FRAME:	NONE	[F6]

In practice, for an 808~ memory reference, it is likely that the FRAME specified by a self-relative reference will be the canonic FRAME of the LSEG containinq the LOCATION, and the FRAME specified by a seqment relative reference will be the canonic FRAME of the LSEG containinq the TARGET. This will be further explained below.

SELF-RELATIVE FIXUPS '

A self-relative fixup operates as follows: A memory address is implicitly defined by LOCATION: namely the address of the byte

following LOCATION (because at the time of a self-relative

reference, the 8086 IP (Instruction Pointer) or the 8989 TP (Task

block Proqram pointer) is pointing to the byte following the reference) •

For 8086 self-relative references, if either LOCATION or TARGET are outside the specified FRAME, R&L qives a warninq. Otherwise, there is a uniaue l6-bit displacement which, when added to the address implicitly defined by LOCATION, will yield the relative position of TARGET in the FRAME.

For 8089 self-relative references (F~), if TARGET is not within

32K from LOCATION, R&L qives a warninq. Otherwise, there is a

unique l6-bit siqned displacement between the LOCATION and the

TARGET.

If the LOCATION is an OFFSET, the displacement is added to LOCATION modulo ~553~: no errors are reported.

If the LOCATION is a LOBYTE, the displacement must be within the range {-128:l27}, otherwise R&L will qive a warninq. The displacement is added to LOCATION modulo 25~.

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