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Copyright © 2013-2019 ARM Limited or its affiliates. All rights reserved.
ARM DDI 0487D.b (ID042519)
ARM
®
Architecture Reference Manual
ARMv8, for ARMv8-A architecture profile
ii Copyright © 2013-2019 ARM Limited or its affiliates. All rights reserved. ARM DDI 0487D.b
Non-Confidential ID042519
ARM Architecture Reference Manual
ARMv8, for ARMv8-A architecture profile
Copyright © 2013-2019 ARM Limited or its affiliates. All rights reserved.
Release Information
The following releases of this document have been made.
Proprietary Notice
This document is protected by copyright and other related rights and the practice or implementation of the information contained
in this document may be protected by one or more patents or pending patent applications. No part of this document may be
reproduced in any form by any means without the express prior written permission of Arm. No license, express or implied, by
estoppel or otherwise to any intellectual property rights is granted by this document unless specifically stated.
Your access to the information in this document is conditional upon your acceptance that you will not use or permit others to use
the information for the purposes of determining whether implementations infringe any third party patents.
THIS DOCUMENT IS PROVIDED “AS IS”. ARM PROVIDES NO REPRESENTATIONS AND NO WARRANTIES,
EXPRESS, IMPLIED OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY, SATISFACTORY QUALITY, NON-INFRINGEMENT OR FITNESS FOR A PARTICULAR
PURPOSE WITH RESPECT TO THE DOCUMENT. For the avoidance of doubt, Arm makes no representation with respect to,
and has undertaken no analysis to identify or understand the scope and content of, patents, copyrights, trade secrets, or other rights.
This document may include technical inaccuracies or typographical errors.
Release history
Date Issue Confidentiality Change
30 April 2013 A.a-1 Confidential-Beta Draft Beta draft of first issue, limited circulation.
12 June 2013 A.a-2 Confidential-Beta Draft Second beta draft of first issue, limited circulation.
04 September 2013 A.a Non-Confidential Beta Beta release.
24 December 2013 A.b Non-Confidential Beta Second beta release.
18 July 2014 A.c Non-Confidential Beta Third beta release.
09 October 2014 A.d Non-Confidential Beta Fourth beta release.
17 December 2014 A.e Non-Confidential Beta Fifth beta release.
25 March 2015 A.f Non-Confidential Beta Sixth beta release.
10 July 2015 A.g Non-Confidential Beta Seventh beta release.
30 September 2015 A.h Non-Confidential Beta Eighth beta release.
28 January 2016 A.i Non-Confidential Beta Ninth beta release.
03 June 2016 A.j Non-Confidential EAC EAC release.
30 September 2016 A.k Non-Confidential v8.0 EAC Updated EAC release.
31 March 2017 B.a Non-Confidential v8.1 EAC, v8.2 Beta Initial release incorporating ARMv8.1 and ARMv8.2.
26 September 2017 B.b Non-Confidential v8.2 EAC Initial v8.2 EAC release, incorporating SPE.
20 December 2017 C.a Non-Confidential v8.3 EAC Initial v8.3 EAC release.
31 October 2018 D.a Non-Confidential v8.4 EAC Initial v8.4 EAC release.
29 April 2019 D.b Non-Confidential v8.4 EAC Updated v8.4 EAC release incorporating accessibility
changes
ARM DD
I 0487D.b Copyright © 2013-2019 ARM Limited or its affiliates. All rights reserved. iii
ID042519 Non-Confidential
TO THE EXTENT NOT PROHIBITED BY LAW, IN NO EVENT WILL ARM BE LIABLE FOR ANY DAMAGES,
INCLUDING WITHOUT LIMITATION ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE, OR
CONSEQUENTIAL DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING
OUT OF ANY USE OF THIS DOCUMENT, EVEN IF ARM HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES.
This document consists solely of commercial items. You shall be responsible for ensuring that any use, duplication or disclosure
of this document complies fully with any relevant export laws and regulations to assure that this document or any portion thereof
is not exported, directly or indirectly, in violation of such export laws. Use of the word “partner” in reference to Arm’s customers
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If any of the provisions contained in these terms conflict with any of the provisions of any click through or signed written
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if there is any conflict between the English version of this document and any translation, the terms of the English version of the
Agreement shall prevail.
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are registered trademarks or trademarks of Arm Limited (or its subsidiaries)
in the US and/or elsewhere. All rights reserved. Other brands and names mentioned in this document may be the trademarks of
their respective owners. You must follow the Arm’s trademark usage guidelines
http://www.arm.com/company/policies/trademarks.
Copyright © 2013-2019 Arm Limited (or its affiliates). All rights reserved.
Arm Limited. Company 02557590 registered in England.
110 Fulbourn Road, Cambridge, England CB1 9NJ.
LES-PRE-20349
In this document, where the term ARM is used to refer to the company it means “Arm or any of its subsidiaries as appropriate”.
Note
• The term ARM can refer to versions of the ARM architecture, for example ARMv8 refers to version 8 of the ARM
architecture. The context makes it clear when the term is used in this way.
• This document describes only the ARMv8-A architecture profile. For the behaviors required by the previous version of
this architecture profile, ARMv7-A, see the ARM
®
Architecture Reference Manual, ARMv7-A and ARMv7-R edition.
Confidentiality Status
This document is Non-Confidential. The right to use, copy and disclose this document may be subject to license restrictions in
accordance with the terms of the agreement entered into by Arm and the party that Arm delivered this document to.
Product Status
The information in this document is final, that is for a developed product.
Web Address
http://www.arm.com
Status and limitations of issue D.b
The issue D.b of the ARMv8 Architecture Reference Manual contains improvements to register descriptions, including changes
to how accessibility, and traps and enables are described. Validation of this document has identified the following issues that ARM
will address in future issues:
• PE state on reset to AArch64 state on page D1-2155 and PE state on reset into AArch32 state on page G1-5305 require
further update. Since the reset information is present in the register descriptions, this does not affect the quality status of
the release.
• Appendix K12 ARM Pseudocode Definition requires further review and update. Since this appendix is informative, rather
than being part of the architecture specification, this does not affect the quality status of this release.
• The accessibility, and traps and enables information for FPCR and FPSR are not consistent with similar information in
other register descriptions. This will be fixed in the next release.
iv Co
pyright © 2013-2019 ARM Limited or its affiliates. All rights reserved. ARM DDI 0487D.b
Non-Confidential ID042519
• The accessibility information for the Generic Timer memory-mapped registers require further updates. Since the
information present in the descriptions are correct, this does not affect the quality of this release. This will be fixed in the
next release.
• Defect fixes to content outside of registers, instructions and pseudocode since publication of issue D.a are not included
in this release.
ARM DDI 0487D.b Copyright © 2013-2019 ARM Limited or its affiliates. All rights reserved. v
ID042519 Non-Confidential
Contents
ARM Architecture Reference Manual ARMv8, for
ARMv8-A architecture profile
Preface
About this manual ..................................................................................................... xvi
Using this manual .................................................................................................... xviii
Conventions ............................................................................................................ xxiv
Additional reading ................................................................................................... xxvi
Feedback .............................................................................................................. xxviii
Part A ARMv8 Architecture Introduction and Overview
Chapter A1 Introduction to the ARMv8 Architecture
A1.1 About the ARM architecture ................................................................................ A1-32
A1.2 Architecture profiles ............................................................................................ A1-34
A1.3 ARMv8 architectural concepts ............................................................................ A1-36
A1.4 Supported data types .......................................................................................... A1-39
A1.5 Advanced SIMD and floating-point support ......................................................... A1-49
A1.6 The ARM memory model .................................................................................... A1-55
A1.7 ARMv8 architecture extensions .......................................................................... A1-56
Part B The AArch64 Application Level Architecture
Chapter B1 The AArch64 Application Level Programmers’ Model
B1.1 About the Application level programmers’ model ................................................ B1-80
B1.2 Registers in AArch64 Execution state ................................................................. B1-81
B1.3 Software control features and EL0 ...................................................................... B1-86
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