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stuij merged 2 commits into from
Oct 29, 2026
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Prepare documents for 2026Q3 release #445

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ce8ede6
Prepare documents for 2026Q3 release
stuij Oct 28, 2026
2df4813
Add back callee and caller saved standardization in aapcs docs
stuij Oct 29, 2026
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2 changes: 2 additions & 0 deletions README.md
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Expand Up @@ -73,6 +73,8 @@ C++ ABI for the Arm 64-bit Architecture | [cppabi64](
Vector Function ABI for the Arm 64-bit Architecture | [vfabia64](vfabia64/vfabia64.rst) | [2019Q2](legacy-documents/vfabia64/101129_1920/101129_1920_01_en.pdf)
C/C++ Atomics ABI for the Arm 64-bit Architecture | [atomicsabi64](atomicsabi64/atomicsabi64.rst) | n/a
System V ABI for the Arm 64-bit Architecture | [sysvabi64](sysvabi64/sysvabi64.rst) | n/a
Build Attributes for the Arm 64-bit Architecture | [buildattr64](buildattr64/buildattr64.rst) | n/a
AArch64 ELF Conventions for Binary Analysis | [baabielf64](baabielf64/baabielf64.rst) | n/a


### ABI for the Arm 64-bit Architecture with SVE support
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7 changes: 5 additions & 2 deletions aadwarf32/aadwarf32.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2003-2007, 2012, 2018, 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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| | | entry in regiter number table. |
| | | - Added PACBTI-M unwinding information.|
+--------+-------------------------------------+----------------------------------------+
| 2026Q3 | 3\ :sup:`rd` November 2026 | - Clarify the ABI uses DWARF 3.0 |
| | | as a baseline. |
+--------+-------------------------------------+----------------------------------------+

References
----------
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4 changes: 2 additions & 2 deletions aadwarf64-morello/aadwarf64-morello.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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9 changes: 7 additions & 2 deletions aadwarf64/aadwarf64.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2010, 2013, 2018, 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
Expand Down Expand Up @@ -254,6 +254,11 @@ changes to the content of the document for that release.
| | | the RA_SIGN_STATE pseudo register at |
| | | **Alpha** quality. |
+--------+-----------------------------+-------------------------------------------+
| 2026Q3 | 3\ :sup:`rd` November 2026 | - Clarify the ABI uses DWARF 3.0 as a |
| | | baseline. |
| | | - Add character to augmentation string |
| | | for return address signing. |
+--------+-----------------------------+-------------------------------------------+


References
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4 changes: 2 additions & 2 deletions aaelf32/aaelf32.rst
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reserved. CC-BY-SA-4.0 AND Apache-Patent-License See LICENSE file
for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2005-2009, 2012, 2015, 2018, 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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8 changes: 5 additions & 3 deletions aaelf64-morello/aaelf64-morello.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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| | | pointers. |
+---------------+------------------------------+---------------------------------------------------+
| 2025Q4 | 23\ :sup:`rd` January 2026 | - Drop GD/IE-to-LE relaxation. |
| | | - Define relocations and code seqeuences for |
| | | - Define relocations and code sequences for |
| | | indirect TLS. |
| | | - Document program headers and dynamic sections. |
+---------------+------------------------------+---------------------------------------------------+
| 2026Q3 | 3\ :sup:`rd` November 2026 | - Simplify relative relocation expressions. |
+---------------+------------------------------+---------------------------------------------------+

References
----------
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23 changes: 14 additions & 9 deletions aaelf64/aaelf64.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2011, 2013, 2018-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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| 2025Q1 | 7\ :sup:`th` | - In `Section Attribute Flags`_, added |
| | April 2025 | `SHF_AARCH64_PURECODE` processor |
| | | specific section attribute flag. |
| | | - Clarify use of addends in GOT |
| | | generating static TLS relocations. |
+---------------+--------------------+-----------------------------------------+
| 2025Q4 | 23\ :sup:`rd` | - In `Call and Jump relocations`_ added |
| | January 2026 | static linker requirements on veneers |
Expand All @@ -293,16 +291,23 @@ changes to the content of the document for that release.
| | | - R_AARCH64_TLS_DTPREL can be used as a |
| | | static relocation as well as dynamic |
+---------------+--------------------+-----------------------------------------+
| 2026Q2 | 29\ :sup:`th` | - In `Call and Jump relocations`_ make |
| | | pc-relative relocations signed. |
+---------------+--------------------+-----------------------------------------+
| 2026Q3 | 13\ :sup:`th` | - Add new section types defined in ELF |
| | August 2026 | extension documents |
| 2026Q3 | 3\ :sup:`rd` | - In `Call and Jump relocations`_ make |
| | November 2026 | pc-relative relocations signed. |
| | | - Add new section types defined in ELF |
| | | extension documents. |
| | | - Remove ILP32 from the ABI. ILP32 is a |
| | | SysV-like data model where int, long |
| | | int and pointer are 32-bit. Refer to |
| | | previous ABI releases for **Beta** |
| | | ILP32 documentation. |
| | | - Improve relocation optimizations. |
| | | - Simplify relative relocation |
| | | expressions. |
| | | - Clarify that PLT32 overflow checking |
| | | is always signed. |
| | | - Define R_AARCH64_AUTH_TLSDESC_CALL. |
| | | - Clarify use of addends in GOT |
| | | generating static TLS relocations. |
+---------------+--------------------+-----------------------------------------+

References
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4 changes: 2 additions & 2 deletions aapcs32/aapcs32.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2003, 2005-2009, 2012, 2015, 2018, 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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6 changes: 3 additions & 3 deletions aapcs64-morello/aapcs64-morello.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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+----------+------------------------------+-----------------------------------------------------+
| 2022Q3 | 20\ :sup:`th` October 2022 | Rework varargs for Morello. |
+----------+------------------------------+-----------------------------------------------------+
| 2025Q4 | 3\ :sup:`rd` March 2026 | - Standardize on "caller-saved" and "callee-saved". |
| 2026Q3 | 3\ :sup:`rd` November 2026 | - Standardize on "caller-saved" and "callee-saved". |
+----------+------------------------------+-----------------------------------------------------+


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12 changes: 5 additions & 7 deletions aapcs64/aapcs64.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2011, 2013, 2018, 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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| | | - Explicitly say that the FFR is a caller-saved register. |
| | | - Clarify how __bf16 affects HFAs |
+------------+--------------------+------------------------------------------------------------------+
| 2025Q4 | 3\ :sup:`rd` | - Standardize on "caller-saved" and "callee-saved". |
| | March 2026 | |
+------------+--------------------+------------------------------------------------------------------+
| 2026Q3 | 13\ :sup:`th` | - Remove ILP32 from the ABI. ILP32 is a SysV-like data model |
| | August 2026 | where int, long int and pointer are 32-bit. Refer to previous |
| 2026Q3 | 3\ :sup:`rd` | - Remove ILP32 from the ABI. ILP32 is a SysV-like data model |

@smithp35 smithp35 Oct 28, 2026

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We've lost the caller-saved, callee saved comment. Was that intentional? Could probably move to 2026q3 if it happened since the last release.

@stuij stuij Oct 29, 2026

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Yea I was a bit on the fence about that one. Normally we don't call out naming changes, but this one is just about weighty enough that it's worth mentioning.

I've put it back. Thanks!

| | November 2026 | where int, long int and pointer are 32-bit. Refer to previous |
| | | ABI releases for **Beta** ILP32 documentation. |
| | | - Standardize on "caller-saved" and "callee-saved". |
+------------+--------------------+------------------------------------------------------------------+

References
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4 changes: 2 additions & 2 deletions addenda32/addenda32.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2005-2009, 2012, 2015, 2018, 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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4 changes: 2 additions & 2 deletions advnote132/advnote132.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2006, 2007, 2009, 2018, 2021-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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6 changes: 4 additions & 2 deletions atomicsabi64/atomicsabi64.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2024-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
Expand Down Expand Up @@ -227,6 +227,8 @@ changes to the content of the document for that release.
| | | - Fix some typos in the 32-bit atomics mapping table. |
| | | - Document release fence using ISHST+ISHLD barriers. |
+---------+------------------------------+-------------------------------------------------------------------+
| 2026Q3 | 3\ :sup:`rd` November 2026 | - Add ``store_add`` mappings for non-returning reductions. |
+---------+------------------------------+-------------------------------------------------------------------+

References
----------
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4 changes: 2 additions & 2 deletions baabielf64/baabielf64.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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4 changes: 2 additions & 2 deletions bpabi32/bpabi32.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2005, 2007, 2008, 2012, 2018, 2021-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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4 changes: 2 additions & 2 deletions bsabi32/bsabi32.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2003, 2005, 2007, 2008 2018, 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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7 changes: 5 additions & 2 deletions buildattr64/buildattr64.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2026Q2
.. |date-of-issue| replace:: 24\ :sup:`th` February 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2026

.. _ADDENDA32: https://github.com/ARM-software/abi-aa/releases
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+------------+---------------------+---------------------------------------------------------------------+
| 0.7 | 24th February 2026 | Initial Beta release. |
+------------+---------------------+---------------------------------------------------------------------+
| 2026Q4 | 3rd November 2026 | Change to general ABI release naming, and include in release |
| | | documents. |
+------------+---------------------+---------------------------------------------------------------------+

References
----------
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4 changes: 2 additions & 2 deletions clibabi32/clibabi32.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2003, 2005-2007, 2009, 2012, 2015, 2018, 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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4 changes: 2 additions & 2 deletions cppabi32/cppabi32.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2003, 2005-2009, 2012, 2015, 2018, 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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4 changes: 2 additions & 2 deletions cppabi64/cppabi64.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2010, 2013, 2018, 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2008, 2018, 2021-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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..
Copyright (c) 2023-2025, Arm Limited and its affiliates. All rights reserved.
Copyright (c) 2023-2026, Arm Limited and its affiliates. All rights reserved.
CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

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4 changes: 2 additions & 2 deletions ehabi32/ehabi32.rst
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CC-BY-SA-4.0 AND Apache-Patent-License
See LICENSE file for details

.. |release| replace:: 2025Q4
.. |date-of-issue| replace:: 23\ :sup:`rd` January 2026
.. |release| replace:: 2026Q3
.. |date-of-issue| replace:: 3\ :sup:`rd` November 2026
.. |copyright-date| replace:: 2002, 2005-2007, 2015, 2018, 2020-2026
.. |footer| replace:: Copyright © |copyright-date|, Arm Limited and its
affiliates. All rights reserved.
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