參數(shù)資料
型號(hào)： KU386
廠商： Intel Corp.
英文描述： SX MICROPROCESSOR
中文描述： SX微處理器
文件頁(yè)數(shù)： 13/102頁(yè)
文件大?。?/td> 1268K
代理商： KU386
Intel386
TM
SX MICROPROCESSOR
Table 2.3. Segment Register Selection Rules
Type of
Implied (Default)
Segment Use
Segment Override
Prefixes Possible
Memory Reference
Code Fetch
CS
None
Destination of PUSH, PUSHF, INT,
CALL, PUSHA Instructons
SS
None
Source of POP, POPA, POPF, IRET,
RET Instructions
SS
None
Destination of STOS, MOVE, REP STOS,
and REP MOVS instructions
ES
None
Other data references, with effective
address using base register of:
[
EAX
]
[
EBX
]
[
ECX
]
[
EDX
]
[
ESI
]
[
EDI
]
[
EBP
]
[
ESP
]
DS
DS
DS
DS
DS
DS
SS
SS
CS,SS,ES,FS,GS
CS,SS,ES,FS,GS
CS,SS,ES,FS,GS
CS,SS,ES,FS,GS
CS,SS,ES,FS,GS
CS,SS,ES,FS,GS
CS,DS,ES,FS,GS
CS,DS,ES,FS,GS
32-BIT MEMORY ADDRESSING MODES
The remaining 6 modes provide a mechanism for
specifying the effective address of an operand. The
linear address consists of two components: the seg-
ment base address and an effective address. The
effective address is calculated by summing any
combination of the following three address elements
(see Figure 2.3):
DISPLACEMENT:
an 8, 16 or 32-bit immediate val-
ue, following the instruction.
BASE:
The contents of any general purpose regis-
ter. The base registers are generally used by compil-
ers to point to the start of the local variable area.
INDEX:
The contents of any general purpose regis-
ter except for ESP. The index registers are used to
access the elements of an array, or a string of char-
acters. The index register’s value can be multiplied
by a scale factor, either 1, 2, 4 or 8. The scaled index
is especially useful for accessing arrays or struc-
tures.
Combinations of these 3 components make up the 6
additional addressing modes. There is no perform-
ance penalty for using any of these addressing com-
binations, since the effective address calculation is
pipelined with the execution of other instructions.
The one exception is the simultaneous use of Base
and Index components which requires one addition-
al clock.
As shown in Figure 2.4, the effective address (EA) of
an operand is calculated according to the following
formula:
EA
e
Base
Register
a
(Index
Register
*
scaling)
a
Displacement
1.
Direct Mode:
The operand’s offset is contained
as part of the instruction as an 8, 16 or 32-bit
displacement.
2.
Register Indirect Mode:
A BASE register con-
tains the address of the operand.
3.
Based Mode:
A BASE register’s contents are
added to a DISPLACEMENT to form the oper-
and’s offset.
4.
Scaled Index Mode:
An INDEX register’s con-
tents are multiplied by a SCALING factor, and the
result is added to a DISPLACEMENT to form the
operand’s offset.
5.
Based Scaled Index Mode:
The contents of an
INDEX register are multiplied by a SCALING fac-
tor, and the result is added to the contents of a
BASE register to obtain the operand’s offset.
6.
Based Scaled Index Mode with Displacement:
The contents of an INDEX register are multiplied
by a SCALING factor, and the result is added to
the contents of a BASE register and a DISPLACE-
MENT to form the operand’s offset.
13
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