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INSTRUCTION {
POINTER
OPERAND
{
POINTER
PROGRAMMING NUMERIC APPLICATIONS
INCREASING
ADDRESSES
15
~
15
CONTROL WORD CONTROL WORD
STATUS
WORD
STATUS
WORD
TAG
WORD
+4
TAG
WORD
INSTRUCTION POINTER (15-0)
-6
IP OFFSET
CS
SELECTOR
INSTRUCTION
;)1'
I
INSTRUCTION
POINTER (19-16) 0
OPCODE (10-0)
-8
DATA
POINTER (15-0)
·10
DATA
OPERAND OFFSET
DATA
POINTER I
(19-16)
0
.12
DATA
OPERAND SELECTOR
TOPSTA
ELEMENT;
'"{
ST
s\
SIGNIFICAND
15-0
+14
SIGNIFICAND
31·16
+1.
SIGNIFICAND
47·32
+\8
SIGNIFICAND
63·48
+20
EXPONENT
14·0
+22
TOP
STA
ELEMENT
'"{
:ST
5\
SIGNIFICAND
15-0
51GNIFICAND
31·16
SIGNIFICANO
47·32
SIGNIFICAND
63·48
EXPONENT
14-0
K NEXTSTAC
ELEMENT:ST(1
)
L
LAST
STAC
ELEMENT:ST
~{
Sl
SIGNIFICAND 15·0
+2'
SIGNIFICANO
31·16
+2.
51GNIFICAND
47·32
+28
SIGNIFICAND 63·48
+30
EXPONENT
14·0
+32
SIGNIFICAND
15·0
+84
SIGNIFICAND
31-16
+8.
SIGNIFfCAND
47·32
+88
SIGNIFICAND
63·48
+90
EXpm~Em
14-0
+92
REAL MODE
NOTES:
S =
Sign
K
NEXT
STAC
ElEMENT:ST
(I)
L
'"{
T(7)
LAST
STA
ELEMENT:S
5\
SIGNIFICAND
15-0
SIGNIFICAND 31·16
SIGNIFICAND
47·32
SIGNIFICAND 63·48
EXPONENT
14-0
SIGNIFICAND
15-0
SlGNIF1CAND 31·16
SIGNIFICAND
47·32
SIGNIFICAND 63·48
EXPONENT
14-0
PROTECTED
MODE
Bit
0
01
each
field
is
rightmost.
least
slgnilicant
bit
of
corresponding
register
field.
Bit
63
of
signiflcand
is
integer
bit
(assumed
binary
point
is
Immediately
to
the
righl).
Figure 2-1.
FSAVE/FRSTOR
Memory Layout
2-18
INCREASING
ADDRESSES
. 1
-0
+4
+6
+8
+10
+12
+14
+1.
+18
+20
+22
+"
+2.
+28
+30
+32
+8'
+8.
+88
+90
+92
G30108