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Procedure Call Standard for the ARM Architecture

ARM IHI 0042F

Procedure Call Standard for the

ARM

Architecture

Document number: ARM IHI 0042F, current through ABI release 2.10

Date of Issue: 24

November 2015

Abstract

This document describes the Procedure Call Standard use by the Application Binary Interface (ABI) for the

ARM architecture.

Keywords

Procedure call function call, calling conventions, data layout

How to find the latest release of this specification or report a defect in it

Please check the ARM Information Center (http://infocenter.arm.com/) for a later release if your copy is more than one year old

(navigate to the ARM Software development tools section, ABI for the ARM Architecture subsection).

Please report defects in this specification to arm dot eabi at arm dot com.

Licence

THE TERMS OF YOUR ROYALTY FREE LIMITED LICENCE TO USE THIS ABI SPECIFICATION ARE GIVEN IN SECTION

1.4, Your licence to use this specification (ARM contract reference

LEC-ELA-00081 V2.0). PLEASE READ THEM

CAREFULLY

BY DOWNLOADING OR OTHERWISE USING THIS SPECIFICATION, YOU AGREE TO BE BOUND BY ALL OF ITS

TERMS. IF YOU DO NOT AGREE TO THIS, DO NOT DOWNLOAD OR USE THIS SPECIFICATION.

THIS

ABI SPECIFICATION IS PROVIDED “AS IS” WITH NO WARRANTIES (SEE SECTION 1.4 FOR DETAILS).

Proprietary notice

ARM, Thumb, RealView, ARM7TDMI and ARM9TDMI are registered trademarks of ARM Limited. The ARM logo

is a trademark of ARM Limited. ARM9, ARM926EJ-S, ARM946E-S, ARM1136J-S, ARM1156T2F-S, ARM1176JZ-

S, Cortex, and Neon are trademarks of ARM Limited. All other products or services mentioned herein may be

trademarks of their respective owners.

Procedure Call Standard for the ARM Architecture

ARM IHI 0042F

1 ABOUT THIS DOCUMENT

1.1 Change Control

1.1.1 Current Status and Anticipated Changes

This document has been released publicly. Anticipated changes to this document include:

 Typographical corrections.

 Clarifications.

 Compatible extensions.

1.1.2 Change History

Issue Date By Change

1.0

October 2003 LS First public release.

2.0

March 2005 LS Second public release.

2.01

July 2005 LS Added clarifying remark following Table 5 – word-sized enumeration

contains are

int

if possible (§7.1.3).

2.02

August 2005 RE Clarify that a callee may modify stack space used for incoming

parameters.

2.03

October 2005 LS Added notes concerning VFPv3 D16-D31 (§5.1.2.1); retracted

requirement that plain bit-fields be unsigned by default (§7.1.7)

2.04

May 2006 RE Clarified when linking may insert veneers that corrupt r12 and the

condition codes (§5.3.1.1).

2.05

January 2007 RE Update for the Advanced SIMD Extension.

2.06

October 2007 RE Add support for half-precision floating point.

October 2007 LS Document renumbered (formerly GENC-003534 v2.06).

April 2008 RE Simplify duplicated text relating to VFP calling and clarify that

homogeneous aggregates of containerized vectors are limited to four

members in calling convention (§6.1.2.1).

October 2008 RE Clarify that __va_list is in namespace std. Specify containers for

oversized enums. State truth values for _Bool/bool. Clarify some

wording with respect to homogeneous aggregates and argument

marshalling of VFP CPRCs

October 2009 LS Re-wrote §7.1.3 to better reflect the intentions for enumerated types

in ABI-complying interfaces.

E 2.09

November 2012 AC Clarify that memory passed for a function result may be modified at

any point during the function call (§5.4). Changed the illustrative

source name of the half-precision float type from __f16 to __fp16 to

match [

ACLE] (§7.1.1). Re-wrote Appendix A to clarify requirements

on Advanced SIMD types.

F r2.10

TBS 2015 CR §A.2, corrected the element counts of poly16x4_t and poly16x8_t.

Added [u]int64x1_t, [u]int64x2_t, poly64x2_t. Allow half-precision

floating point types as function parameter and return types, by

specifying how half-precision floating point types are passed and

returned in registers (§5.4,§5.5,§6.1.1,§6.1.2.1). Added parameter

Procedure Call Standard for the ARM Architecture

ARM IHI 0042F

passing rules for over-aligned types (§4.3,§5.5).

1.2 References

This document refers to, or is referred to by, the following documents.

Ref URL or other reference Title

AAPCS

This document

Procedure Call Standard for the ARM Architecture

AAELF

ELF for the ARM Architecture

BSABI

ABI for the ARM Architecture (Base Standard)

CPPABI

C++ ABI for the ARM Architecture

ARM ARM ARM DDI 0100E, ISBN 0 201 737191

(Also from http://infocenter.arm.com/help/index.jsp

as the ARMv5 Architecture Reference Manual)

The ARM Architecture Reference Manual, 2

edition, edited by David Seal, published by

Addison-Wesley.

ARM DDI 0406

(Subject to licence terms; please apply to ARM)

ARM Architecture Reference Manual ARM v7-A

and ARM v7-R edition

ACLE ARM IHI 0053A

(from http://infocenter.arm.com/help/index.jsp as

the ARM C Language Extensions)

ARM C Language Extensions

GC++ABI http://mentorembedded.github.com/cxx-

abi/abi.html

Generic C++ ABI

1.3 Terms and Abbreviations

This document uses the following terms and abbreviations.

Term Meaning

ABI Application Binary Interface:

1. The specifications to which an executable must conform in order to execute in a

specific execution environment. For example, the Linux ABI for the ARM Architecture.

2. A particular aspect of the specifications to which independently produced relocatable

files must conform in order to be statically linkable and executable. For example, the

C++ ABI for the ARM Architecture, the Run-time ABI for the ARM Architecture, the C

Library ABI for the ARM Architecture.

ARM-based … based on the ARM architecture …

EABI

An ABI suited to the needs of embedded (sometimes called free standing) applications.

PCS Procedure Call Standard.

AAPCS Procedure Call Standard for the ARM Architecture (this standard).

APCS ARM Procedure Call Standard (obsolete).

TPCS Thumb Procedure Call Standard (obsolete).

ATPCS ARM-Thumb Procedure Call Standard (precursor to this standard).

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