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Copyright (c) 2016 OpenPOWER Foundation
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Licensed under the GNU Free Documentation License, Version 1.3;
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with no Invariants Sections, with no Front-Cover Texts,
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and with no Back-Cover Texts (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.gnu.org/licenses/fdl-1.3.txt
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-->
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<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xl="http://www.w3.org/1999/xlink"
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version="5.0" xml:lang="en"
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xml:id="ch_1">
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<title>Introduction</title>
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<para>The Executable and Linking Format (ELF) defines a linking interface
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for executables and shared objects in two parts.</para>
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<itemizedlist>
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<listitem>
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<para>The first part is the generic System V ABI
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(<link xl:href="http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/normativerefs.html#NORMATIVEREFSSECT">http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/normativerefs.html#NORMATIVEREFSSECT</link>).
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</para>
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</listitem>
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<listitem>
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<para>The second part is a processor-specific supplement.</para>
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</listitem>
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</itemizedlist>
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<para>This document, the OpenPOWER ABI for Linux Supplement for the Power
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Architecture 64-bit ELF V2 ABI, is the OpenPOWER-compliant
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processor-specific supplement for use with ELF V2 on 64-bit IBM Power
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Architecture® systems. This is not a complete System V ABI supplement
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because it does not define any library interfaces.</para>
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<para>This document establishes both big-endian and little-endian
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application binary interfaces (see
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<xref linkend="dbdoclet.50655240___RefHeading___Toc377640574" />).
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OpenPOWER-compliant processors in the 64-bit Power Architecture can execute
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in either big-endian or little-endian mode. Executables and
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executable-generated data (in general) that subscribe to either byte
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ordering are not portable to a system running in the other mode.</para>
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<itemizedlist>
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<listitem>
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<para>Note:
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<link xl:href="http://www.power.org/">This ABI specification does not
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address little-endian byte ordering before Power ISA 2.03.</link>
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</para>
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</listitem>
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</itemizedlist>
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<para>The OpenPOWER ELF V2 ABI is not the same as either the Power
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Architecture 32-bit ABI supplement or the 64-bit IBM PowerPC® ELF ABI (ELF
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V1).</para>
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<para>The Power Architecture 64-bit OpenPOWER ELF V2 ABI supplement is
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intended to use the same structural layout now followed in practice by
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other processor-specific ABIs.</para>
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<section xml:id="dbdoclet.50655239___RefHeading___Toc377640569">
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<title>Reference Documentation</title>
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<para>The archetypal ELF ABI is described by the System V ABI.
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Supersessions and addenda that are specific to OpenPOWER ELF V2 Power
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Architecture (64-bit) processors are described in this document.</para>
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<para>The following documents are complementary to this document and
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equally binding:</para>
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<itemizedlist>
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<listitem>
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<para>
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<emphasis>Power Instruction Set Architecture,</emphasis>
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Versions <phrase revisionflag="deleted">2.7</phrase> <phrase
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revisionflag="added">2.07</phrase>
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and 3.0, IBM, 2013-2016.
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<emphasis>
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<link xl:href="http://www.power.org">http://www.power.org
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</link>
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</emphasis></para>
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</listitem>
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<listitem>
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<para>
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<emphasis>DWARF Debugging Information Format,</emphasis> Version 4,
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DWARF Debugging Information Format Workgroup, 2010.
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<emphasis>
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<link xl:href="http://dwarfstd.org/Dwarf4Std.php">http://dwarfstd.org/Dwarf4Std.php</link>
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</emphasis></para>
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</listitem>
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<listitem>
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<para>
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<emphasis>ISO/IEC 9899:2011: Programming languages—C</emphasis>.
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<emphasis>
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<link xl:href="http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=57853">http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=57853
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</link>
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</emphasis></para>
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</listitem>
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<listitem xml:id="dbdoclet.50655239_page12">
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<para>Itanium C++ ABI: Exception Handling. Rev 1.22, CodeSourcery,
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2001.
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<emphasis>
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<link xl:href="http://www.codesourcery.com/public/cxx-abi/abi-eh.html">http://www.codesourcery.com/public/cxx-abi/abi-eh.html
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</link>
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</emphasis></para>
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</listitem>
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<listitem>
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<para>
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<emphasis>ISO/IEC TR 24732:2009 – Programming languages, their
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environments and system software interfaces – Extension for the
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programming language C to support decimal floating-point
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arithmetic</emphasis>, ISO/IEC, January 05, 2009. Available from ISO.
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<emphasis>
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<link xl:href="http://www.iso.org/iso/home/store/catalogue_tc/catalogue_tc_browse.htm?commid=45202">http://www.iso.org/iso/home/store/catalogue_tc/catalogue_tc_browse.htm?commid=45202
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</link>
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</emphasis></para>
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</listitem>
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<listitem>
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<para>
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<emphasis>ELF Handling for Thread-Local Storage</emphasis>, Version
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0.20, Ulrich Drepper, Red Hat Inc., December 21, 2005.
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<emphasis>
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<link xl:href="http://people.redhat.com/drepper/tls.pdf">http://people.redhat.com/drepper/tls.pdf
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</link>
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</emphasis></para>
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</listitem>
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</itemizedlist>
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<para>The following documents are of interest for their historical
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information but are not normative in any way.</para>
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<itemizedlist>
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<listitem>
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<para>
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<emphasis>64-bit PowerPC ELF Application Binary Interface Supplement
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1.9.</emphasis>
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<emphasis>
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<link xl:href="http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html">http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html
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</link>
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</emphasis>
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</para>
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</listitem>
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<listitem>
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<para>
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<emphasis>IBM PowerOpen™ ABI Application Binary Interface Big-Endian
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32-Bit Hardware Implementation.</emphasis>
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<emphasis>
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<link xl:href="ftp://www.sourceware.org/pub/binutils/ppc-docs/ppc-poweropen/">
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<citetitle>
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ftp://www.sourceware.org/pub/binutils/ppc-docs/ppc-poweropen/</citetitle>
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</link>
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</emphasis>
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</para>
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</listitem>
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<listitem>
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<para>
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<emphasis>Power Architecture 32-bit ABI Supplement 1.0
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Embedded/Linux/Unified.</emphasis>
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<emphasis>
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<link xl:href="https://www.power.org/documentation/power-architecture-32-bit-abi-supplement-1-0-embeddedlinuxunified/">
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<citetitle>
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https://www.power.org/documentation/power-architecture-32-bit-abi-supplement-1-0-embeddedlinuxunified/</citetitle>
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</link>
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</emphasis>
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</para>
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</listitem>
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<listitem>
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<para>
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<emphasis>ALTIVEC PIM: AltiVec™ Technology Programming Interface
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Manual</emphasis>, Freescale Semiconductor, 1999.
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<emphasis>
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<link xl:href="http://www.freescale.com/files/32bit/doc/ref_manual/ALTIVECPIM.pdf">http://www.freescale.com/files/32bit/doc/ref_manual/ALTIVECPIM.pdf
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</link>
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</emphasis></para>
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</listitem>
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<listitem>
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<para>ELF Assembly User’s Guide, Fourth edition, IBM, 2000.
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<emphasis>
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<link xl:href="https://www-03.ibm.com/technologyconnect/tgcm/TGCMFileServlet.wss/assem_um.pdf?id=109917A251EFD64C872569D900656D07&linkid=1h3000&c_t=md515o6ntgh671shz9ioar20oyfp1grs">
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<citetitle>
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https://www-03.ibm.com/technologyconnect/tgcm/TGCMFileServlet.wss/assem_um.pdf?id=109917A251EFD64C872569D900656D07&linkid=1h3000&c_t=md515o6ntgh671shz9ioar20oyfp1grs</citetitle>
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</link>
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</emphasis>
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</para>
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</listitem>
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</itemizedlist>
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</section>
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<section revisionflag="added">
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<title>Changes from Revision 1.4</title>
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<itemizedlist>
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<listitem>
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<para>
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Errata recorded at <link xl:href="https://openpowerfoundation.org/?resource_lib=openpower-elfv2-errata-elfv2-abi-version-1-4">https://openpowerfoundation.org/?resource_lib=openpower-elfv2-errata-elfv2-abi-version-1-4</link>
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have been incorporated into this document.
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</para>
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</listitem>
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<listitem>
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<para>
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PowerISA version 3.1 introduces PC-relative instructions for
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accessing code and data. Thus compilers and assembly programmers
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that target version 3.1 or later can, if desired, avoid usage of
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a TOC pointer for such accesses. The ABI has been updated to
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describe the implications of this new capability. For specifics,
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see <xref linkend="dbdoclet.50655241_FnLinkage" />, <xref
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linkend="dbdoclet.50655240___RefHeading___Toc377640591" />, <xref
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linkend="dbdoclet.50655241_18894" />, <xref
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linkend="dbdoclet.50655241_LinkerOpts" />, <xref
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linkend="dbdoclet.50655242_47739" />, and <xref
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linkend="dbdoclet.50655242_82622" />.
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</para>
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</listitem>
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</itemizedlist>
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</section>
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</chapter>
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