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Thumb-2 Supplement Reference Manual
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The purpose of this manual is to describe Thumb®-2, its Instruction Set Architecture (ISA), and the changes to the programmers’ model it introduces. This manual also describes the extensions to the ARM® ISA introduced at the same time.
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Copyright © 2004, 2005 ARM Limited. All rights reserved.
ARM DDI 0308D
ARM Architecture
Reference Manual
Thumb-2 Supplement
ii Copyright © 2004, 2005 ARM Limited. All rights reserved. ARM DDI 0308D
ARM Architecture Reference Manual
Copyright © 2004, 2005 ARM Limited. All rights reserved.
Release Information
The following changes have been made to this document.
Proprietary Notice
ARM, the ARM Powered logo, Thumb, and StrongARM are registered trademarks of ARM Limited.
The ARM logo, AMBA, Angel, ARMulator, EmbeddedICE, ModelGen, Multi-ICE, PrimeCell, ARM7TDMI,
ARM7TDMI-S, ARM9TDMI, ARM9E-S, ETM7, ETM9, TDMI, STRONG, are trademarks of ARM Limited.
All other products or services mentioned herein may be trademarks of their respective owners.
The product described in this document is subject to continuous developments and improvements. All particulars of the
product and its use contained in this document are given by ARM in good faith.
1. Subject to the provisions set out below, ARM hereby grants to you a perpetual, non-exclusive, nontransferable, royalty
free, worldwide licence to use this ARM Architecture Reference Manual for the purposes of developing; (i) software
applications or operating systems which are targeted to run on microprocessor cores distributed under licence from ARM;
(ii) tools which are designed to develop software programs which are targeted to run on microprocessor cores distributed
under licence from ARM; (iii) integrated circuits which incorporate a microprocessor core manufactured under licence
from ARM.
2. Except as expressly licensed in Clause 1 you acquire no right, title or interest in the ARM Architecture Reference
Manual, or any Intellectual Property therein. In no event shall the licences granted in Clause 1, be construed as granting
you expressly or by implication, estoppel or otherwise, licences to any ARM technology other than the ARM Architecture
Reference Manual. The licence grant in Clause 1 expressly excludes any rights for you to use or take into use any ARM
patents. No right is granted to you under the provisions of Clause 1 to; (i) use the ARM Architecture Reference Manual
for the purposes of developing or having developed microprocessor cores or models thereof which are compatible in
whole or part with either or both the instructions or programmer's models described in this ARM Architecture Reference
Manual; or (ii) develop or have developed models of any microprocessor cores designed by or for ARM; or (iii) distribute
in whole or in part this ARM Architecture Reference Manual to third parties without the express written permission of
ARM; or (iv) translate or have translated this ARM Architecture Reference Manual into any other languages.
3.THE ARM ARCHITECTURE REFERENCE MANUAL IS PROVIDED "AS IS" WITH NO WARRANTIES
EXPRESS, IMPLIED OR STATUTORY, INCLUDING BUT NOT LIMITED TO ANY WARRANTY OF
SATISFACTORY QUALITY, NONINFRINGEMENT OR FITNESS FOR A PARTICULAR PURPOSE.
Change History
Date Issue Change
December 2004 A First release
April 2005 C Updated to incorporate corrections to errata
December 2005 D Updated for unified assembler syntax.
ARM DDI 0308D Copyright © 2004, 2005 ARM Limited. All rights reserved. iii
4. No licence, express, implied or otherwise, is granted to LICENSEE, under the provisions of Clause 1, to use the ARM
tradename, in connection with the use of the ARM Architecture Reference Manual or any products based thereon.
Nothing in Clause 1 shall be construed as authority for you to make any representations on behalf of ARM in respect of
the ARM Architecture Reference Manual or any products based thereon.
Copyright © 2004, 2005 ARM limited
110 Fulbourn Road Cambridge, England CB1 9NJ
Restricted Rights Legend: Use, duplication or disclosure by the United States Government is subject to the restrictions
set forth in DFARS 252.227-7013 (c)(1)(ii) and FAR 52.227-19
The right to use and copy this document is subject to the licence set out above.
iv Copyright © 2004, 2005 ARM Limited. All rights reserved. ARM DDI 0308D
ARM DDI 0308D Copyright © 2004, 2005 ARM Limited. All rights reserved. v
Contents
ARM Architecture Reference Manual
Thumb-2 Supplement
Preface
About this manual ............................................................................... viii
Unified Assembler Language ................................................................ ix
Using this manual .................................................................................. x
Conventions .......................................................................................... xi
Further reading .................................................................................... xii
Feedback ............................................................................................ xiii
Chapter 1 Introduction to Thumb-2
1.1 About Thumb-2 .................................................................................. 1-2
1.2 Changes to Thumb assembly language syntax ................................. 1-3
1.3 New 32-bit Thumb instructions ........................................................... 1-4
1.4 New 16-bit Thumb instructions ........................................................... 1-5
1.5 New 32-bit ARM instructions .............................................................. 1-6
1.6 Hint instructions ................................................................................. 1-7
1.7 Thumb-2 architecture constraints ....................................................... 1-9
Chapter 2 Programmers’ Model
2.1 New program status register fields ..................................................... 2-2
2.2 Changes to exception handling .......................................................... 2-4
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