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Copyright © 2013-2020 Arm Limited or its affiliates. All rights reserved.
ARM DDI 0487F.a (ID021920)
Arm
®
Architecture Reference Manual
Armv8, for Armv8-A architecture profile
Beta
ii Copyright © 2013-2020 Arm Limited or its affiliates. All rights reserved. ARM DDI 0487F.a
Non-Confidential - Beta ID021920
Arm Architecture Reference Manual
Armv8, for Armv8-A architecture profile
Copyright © 2013-2020 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 Armv8.0 EAC Updated EAC release
31 March 2017 B.a Non-Confidential Armv8.1 EAC, v8.2 Beta Initial release incorporating Armv8.1 and Armv8.2
26 September 2017 B.b Non-Confidential Armv8.2 EAC Initial Armv8.2 EAC release, incorporating SPE
20 December 2017 C.a Non-Confidential Armv8.3 EAC Initial Armv8.3 EAC release
31 October 2018 D.a Non-Confidential Armv8.4 EAC Initial Armv8.4 EAC release
29 April 2019 D.b Non-Confidential Armv8.4 EAC Updated Armv8.4 EAC release incorporating
accessibility changes
05 July 2019 E.a Non-Confidential Armv8.5 EAC Initial Armv8.5 EAC release
21 February 2020 F.a Non-Confidential Armv8.6 Beta Initial Armv8.6 Beta release
ARM DDI 0487F.a Copyright © 2013-2020 Arm Limited or its affiliates. All rights reserved. iii
ID021920 Non-Confidential - Beta
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INCLUDING WITHOUT LIMITATION ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE, OR
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Copyright © 2013-2020 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 for a Beta product, that is a product under development.
Web Address
http://www.arm.com
Limitations of this issue
This issue of the Armv8 Architecture Reference Manual contains many improvements and corrections. 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 D1-2336 and PE state on reset into AArch32 state on page G1-5761 require
further update. Since the reset information is present in the register descriptions, this does not affect the quality status of
the release.
• Appendix K13 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.
• For a list of the known issues in the System register and instruction XML content, please refer to the Release Notes on
https://developer.arm.com/architectures/cpu-architecture/a-profile/exploration-tools
iv Copyright © 2013-2020 Arm Limited or its affiliates. All rights reserved. ARM DDI 0487F.a
Non-Confidential - Beta ID021920
ARM DDI 0487F.a Copyright © 2013-2020 Arm Limited or its affiliates. All rights reserved. v
ID021920 Non-Confidential - Beta
Contents
Arm Architecture Reference Manual Armv8, for
Armv8-A architecture profile
Preface
About this manual ................................................................................................... xviii
Using this manual ...................................................................................................... xx
Conventions ............................................................................................................ xxvi
Additional reading ................................................................................................. xxviii
Feedback ................................................................................................................. xxx
Part A Armv8 Architecture Introduction and Overview
Chapter A1 Introduction to the Armv8 Architecture
A1.1 About the Arm architecture ................................................................................. A1-34
A1.2 Architecture profiles ............................................................................................ A1-36
A1.3 Armv8 architectural concepts .............................................................................. A1-37
A1.4 Supported data types .......................................................................................... A1-40
A1.5 Advanced SIMD and floating-point support ......................................................... A1-52
A1.6 The Arm memory model ...................................................................................... A1-59
Chapter A2 Armv8-A Architecture Extensions
A2.1 Armv8 architecture extensions ............................................................................ A2-62
A2.2 Architectural features within Armv8.0 architecture .............................................. A2-65
A2.3 The Armv8 Cryptographic Extension ................................................................... A2-68
A2.4 The Armv8.1 architecture extension .................................................................... A2-69
A2.5 The Armv8.2 architecture extension .................................................................... A2-72
A2.6 The Armv8.3 architecture extension .................................................................... A2-81
A2.7 The Armv8.4 architecture extension .................................................................... A2-85
A2.8 The Armv8.5 architecture extension .................................................................... A2-90
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