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8086
Object
Module
Formats
Version
4.8
3
Self-Relative
Reference
To
An
EXTERNAL
Symbol
A
LLLLLLLLLLLLLL
(-
PP ?
••••••••••••••
L L • •
L
+--------+
L
••••••••••••
L I
LOC
1-------------------->.
SYM
••
L
+--------+
L
L , L
LLLI.LLLLLLLLLL
FIXUP"REPRESENTATI IN:
LOCATION:
OFFSET
or
LOBYTE
•
••••••••••
•
•
• •
• • • • • • • • • • • •
PSEG:
SI(A)
(this
is
the
most
common
choice)
TARGeT:
EI(SY~),0
<-
PT
or
EI(SYM)
if
the
offset
is
to
be
maintained
in
LOCATION
Or
if
the
reference
is
to
the
i'th
element
of
an
external
array:
LOCATION:
OFFSET
or
LOBYTE
PSEG: SICA)
this
is
the
most
common
choice
TARGET:
EI(SYM)
,i-1
LINK
OPERATION:
There
are
three
ways
in
which
an
external
self-relative
reference
,ay
be
resol
ved
•
CASE
1:
The
EX'fERNAL
symbol
(SYM)
is
found
(by
LINK)
to
be
in
the
same
LSEG
as
the
LOCATION.
CASE
2:
The
EXTERNAL
symbol
(SYM)
is
found
(by
LINK)
to
be
in
a
different
LSEG, B.
CASE
3:
The
EXTERNAL
symbol
(SYM)
is
found
(by
LINK)
to
!)e
absolute.
103