ARM ARM1176JZF-S User Manual

Programmer’s Model
ARM DDI 0301H Copyright © 2004-2009 ARM Limited. All rights reserved. 2-33
ID012310 Non-Confidential, Unrestricted Access
LDREXD
Figure 2-15 shows the format of the Load Register Doubleword Exclusive, LDREXD,
instruction.
Figure 2-15 LDREXD instruction
Syntax
LDREXD{<cond>} <Rd>, [<Rn>]
Operation
if ConditionPassed(cond) then
processor_id = ExecutingProcessor()
Rd = Memory[Rn,4]
R(d+1) = Memory[Rn+4,4]
if Shared(Rn) ==1 then
physical_address=TLB(Rn)
MarkExclusiveGlobal(physical_address,processor_id,8)
MarkExclusiveLocal(processor_id)
STREXD
Figure 2-16 shows the format of the Store Register Doubleword Exclusive, STREXD,
instruction.
Figure 2-16 STREXD instruction
Syntax
STREXD{<cond>} <Rd>, <Rm>, [<Rn>]
Operation
if ConditionPassed(cond) then
processor_id = ExecutingProcessor()
if IsExclusiveLocal(processor_id) then
if Shared(Rn)==1 then
physical_address=TLB(Rn)
if IsExclusiveGlobal(physical_address,processor_id,8) then
Memory[Rn,4] = Rm
Memory[Rn+4,4] = R(m+1)
Rd = 0
ClearByAddress(physical_address,8)
else
Rd =1
else
Memory[Rn,4] = Rm
Memory[Rn+4,4] = R(m+1)
Rd = 0
else
Rd = 1
SBOCond
31 28 27 21 20 19 15 12 11 7 4 3 0
0 0 0 1 1 0 1 1 Rn Rd SBO 1 0 0 1
16 8
RmCond
31 28 27 21 20 19 15 12 11 7 4 3 0
0 0 0 1 1 0 1 0 Rn Rd SBO 1 0 0 1
16 8

ARM ARM1176JZF-S Specifications

General

Brand	ARM
Model	ARM1176JZF-S
Category	Computer Hardware
Language	English