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d086
Object
Module
Formats
version
4.0
attribute
of
the
LSEG.
The
semantics
are
defined
as
follows:
A=0 SEGDEF
describes
an
absolute
LSEG.
A=l
SEGDEF
describes
a
relocatable,
byte
aliqned
LSEG.
A=2 SEGDEF
describes
a
relocatable,
word
aliqned
LSEG.
A=3 SEGDEF
describes
a
relocatable,
paraqraph
aligned
LSEG.
A=4 SEGDEF
describes
a
relocatable,
paqe
aligned
LSEG.
A=5 SEGDEF
describes
an
unnamed
absolute
portion
of
MAS.
A=6 SEGDEF
describes
a
load-time
locatable
(LTL),
paraqraph
aligned
LSEG
if
not
member
of
any
qroup.
In
addition
the
value
of
A
determines
if
one
or
several
··conditional··
fields
will
be
present.
If
A=0
or
A=5
then
the
FRAME
NUMBER
and
OFFSET
fields
will
be
present.
If
A=6
then
the
LTL
OAT,
MAXIMU~
SEGMENT
LENGTH,
and
GROUP
OFFSET
fields
will
be
present.
If
A<>5
then
the
three
NAME
INDEX
fields
will
be
present.
C
(Combination)
is
a
3-bit
subfield
that
specifies
the
combination
attribute
of
the
LSEG.
Absolute
seqments
(A=0
or
A=5)
must
have
combination
zero
(C=0).
In
this
case
the
seqments
will
be
combined
like
C=6
below
if
and
only
if
their
FRAME
NUMBER's
and
OFFSET's
match
(For
A=0
their
complete
names
Must
match
as
well).
For
relocatable
segments,
the
C
field
encodes
a
number
0,1,2,4,5,6
or
7
indicatinq
how
the
segment
may
be
combined.
The
interpretation
of
this
attribute
is
best
qiven
by
considerinq
how
two
LSEG's
are
combined:
Let
X,Y
be
LSEG's,
and
let
Z
-be
the
LSEG
resulting
from
the
combination
of
X,Y.
Let
LX
and
LY
be
the
lenqths
of
X
and
Y,
and
let
MXY
denote
the
maximum
of
LX,LY.
Let
G
be
the
length
of
any
gap
required
between
the
X-
and
Y-components
of
Z
to
accommodate
the
aliqnment
attribute
of
Y.
Let
LZ
denote
the
length
of
the
(combined)
LSEG
Zi
let
dx
(0<=dx<LX)
be
the
offset
in
X
of
a
byte,
and
let
dy
similarly
be
the
offset
in
Y
of
a
byte.
Then
the
followinq
table
qives
the
lenqth
LZ
of
the
combined
LSEG
Z,
and
the
offsets
dx'
and
dye
in
Z
for
the
bytes
correspondinq
to
dx
in
X
and
dy
in
Y:
C
LZ
dx'
~y~
'2
LX+LY+G
di-
dy+LX+G
4
LX+LY
dx
dy
5
LX+LY
dx+LY
dy+LX
~
MXY
dx
dy
7
I~XY
dx+MXY-LX
dy+MXY-LY
The
above
table
has
no
lines
for
C=0,
C=l
or
C=3.
C=0
indicates
that
the
relocatable
LSEG
may
not
be
combined;
C=l
has
the
same
combination
semantics
as
C=6,
but
addition~lly
"distinquishes"
the
LSEG
so
that
LOCATE-8~
will
(in
the
default
case)
place
the
LSEG
above
all
other
LSEG's
in
MAS
(this
corresponds
to
the
MEMORY
seqment
semantics
of
8080
R&L); C=3
is
undefined.
B
(Big)
is
a
I-bit
subfield
which.
if
1,
indicates
that
the
Seament
Lenqth
is
exactly
~4K
(6553fi).
In
this
case
the
SEGMENT
LENGTH
field
must
contain
zero.
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