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changes

All the changes in this release are captured by the 2022Q1 milestones.
Substantive changes:

  • aapcs64-morello:
    fix up rule C.8 on capabilities: #120

  • aaelf64:
    soft-deprecate GNU_PROPERTY_AARCH64_FEATURE_1_PAC: #121

  • aadwarf64:
    move Pointer Authentication out from BETA state: #127
    document a limitation of the DW_CFA_AARCH64_negate_ra_state: #129

alpha-level support for Scalable Matrix Extension (SME)

A piece of work that didn't make it into the release but should get an honorable mention is the 'alpha-level support for SME' pull request: #123. This involves big changes to the aapcs64 document, and we would appreciate any kind of feedback on it.

the specifications included in this release

ABI for the Arm 32-bit Architecture

  • ABI for the Arm Architecture - Base Standard - pdf, html
  • Procedure Call Standard for the Arm Architecture - pdf, html
  • ELF for the Arm Architecture - pdf, html
  • DWARF for the Arm Architecture - pdf, html
  • Base Platform ABI for the Arm Architecture - pdf, html
  • C++ ABI for the Arm Architecture - pdf, html
  • Exception Handling ABI for the Arm Architecture - pdf, html
  • Run-time ABI for the Arm Architecture - pdf, html
  • C Library for the Arm Architecture - pdf, html
  • Support for Debugging Overlaid Programs - pdf, html
  • Addenda to, and Errata in, the ABI for the ARM Architecture - pdf, html
  • ABI Advisory Note - SP 8-byte alignment - pdf, html

ABI for the Arm 64-bit Architecture

  • Procedure Call Standard for the Arm 64-bit Architecture - pdf, html
  • ELF for the Arm 64-bit Architecture - pdf, html
  • DWARF for the Arm 64-bit Architecture - pdf, html
  • C++ ABI for the Arm 64-bit Architecture - pdf, html
  • Vector Function ABI for the Arm 64-bit Architecture - pdf, html
  • System V ABI for the Arm 64-bit Architecture - pdf, html

PAuth ABI Extension

  • PAuth ABI Extension to ELF for the Arm 64-bit Architecture - pdf, html

Morello Extension

  • Morello Extension to the Procedure Call Standard for the Arm 64-bit Architecture - pdf, html
  • Morello Extension to ELF for the Arm 64-bit Architecture - pdf, html
  • Morello Extension to DWARF for the Arm 64-bit Architecture - pdf, html

Miscellaneous material

  • Semihosting for AArch32 and AArch64 - pdf, html

download bundle

PDFs of all the above specifications have also been bundled in this zip file.

other specifications

For older versions of the ABI specifications from before they got hosted within this Github repository, please go to:
https://developer.arm.com/architectures/system-architectures/software-standards/abi

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changes

documents added

  • System V ABI for the Arm 64-bit Architecture - pdf, html

The SYSV ABI document is currently in alpha status and as for now only contains information on addressing modes and code models. We wish to expand the SYSV ABI content in the future.

changes made to existing documents

  • aaelf64-morello:
    add ELF markers to identify Morello purecap binaries: #101

  • aaelf64:
    reserved relocation codes for pauthabielf64: #100

  • aapcs64:
    Add support for Decimal-floating-point formats: #114

  • addenda32:
    Add Armv9-A value to Tag_CPU_arch: #111

  • pauthabielf64:
    clarify the concepts of a default and alternate pauth elf signing schemes: #105

the specifications included in this release

ABI for the Arm 32-bit Architecture

  • ABI for the Arm Architecture - Base Standard - pdf, html
  • Procedure Call Standard for the Arm Architecture - pdf, html
  • ELF for the Arm Architecture - pdf, html
  • DWARF for the Arm Architecture - pdf, html
  • Base Platform ABI for the Arm Architecture - pdf, html
  • C++ ABI for the Arm Architecture - pdf, html
  • Exception Handling ABI for the Arm Architecture - pdf, html
  • Run-time ABI for the Arm Architecture - pdf, html
  • C Library for the Arm Architecture - pdf, html
  • Support for Debugging Overlaid Programs - pdf, html
  • Addenda to, and Errata in, the ABI for the ARM Architecture - pdf, html
  • ABI Advisory Note - SP 8-byte alignment - pdf, html

ABI for the Arm 64-bit Architecture

  • Procedure Call Standard for the Arm 64-bit Architecture - pdf, html
  • ELF for the Arm 64-bit Architecture - pdf, html
  • DWARF for the Arm 64-bit Architecture - pdf, html
  • C++ ABI for the Arm 64-bit Architecture - pdf, html
  • Vector Function ABI for the Arm 64-bit Architecture - pdf, html
  • System V ABI for the Arm 64-bit Architecture - pdf, html

PAuth ABI Extension

  • PAuth ABI Extension to ELF for the Arm 64-bit Architecture - pdf, html

Morello Extension

  • Morello Extension to the Procedure Call Standard for the Arm 64-bit Architecture - pdf, html
  • Morello Extension to ELF for the Arm 64-bit Architecture - pdf, html
  • Morello Extension to DWARF for the Arm 64-bit Architecture - pdf, html

Miscellaneous material

  • Semihosting for AArch32 and AArch64 - pdf, html

download bundle

PDFs of all the above specifications have also been bundled as a zip file.

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changes

This release marks the completion of importing all the ABI documents into this repository. Thanks to everybody that made this possible.

Furthermore the other major addition is specifications around PAC/BTI-M .

newly converted documents

  • ABI Advisory Note (advnote132)
  • Support for Debugging Overlaid Programs (dbgovl32)
  • Application Binary Interface for the Arm Architecture introduction (bsabi32)
  • Base Platform ABI for the Arm Architecture (bpabi32)
  • C++ ABI for the Arm 64-bit Architecture (cppabi64)

changes to documents

  • aapcs32: Clarify what it means for a VFP CPRC argument to be correctly aligned.
  • addenda32: Add definitions for PACBTI-M related build attributes.
  • ehabi: PACBTI-M unwinding information.
  • aadwarf32:
    • PACBTI-M unwinding information.
    • Deleted duplicated TPIDRURO register number entry.
  • aapcs64:
    • Clarify rule C.4 of the parameter passing rules when there is an overaligned HFA.
    • Minor formatting changes.
  • aaelf64: Various typo fixes.
  • clibabi32: BTI info

the specifications included in this release

ABI for the Arm 32-bit Architecture

  • ABI for the Arm Architecture - Base Standard - pdf, html
  • Procedure Call Standard for the Arm Architecture - pdf, html
  • ELF for the Arm Architecture - pdf, html
  • DWARF for the Arm Architecture - pdf, html
  • Base Platform ABI for the Arm Architecture - pdf, html
  • C++ ABI for the Arm Architecture - pdf, html
  • Exception Handling ABI for the Arm Architecture - pdf, html
  • Run-time ABI for the Arm Architecture - pdf, html
  • C Library for the Arm Architecture - pdf, html
  • Support for Debugging Overlaid Programs - pdf, html
  • Addenda to, and Errata in, the ABI for the ARM Architecture - pdf, html
  • ABI Advisory Note - SP 8-byte alignment - pdf, html

ABI for the Arm 64-bit Architecture

  • Procedure Call Standard for the Arm 64-bit Architecture - pdf, html
  • ELF for the Arm 64-bit Architecture - pdf, html
  • DWARF for the Arm 64-bit Architecture - pdf, html
  • C++ ABI for the Arm 64-bit Architecture - pdf, html
  • Vector Function ABI for the Arm 64-bit Architecture - pdf, html

PAuth ABI Extension

  • PAuth ABI Extension to ELF for the Arm 64-bit Architecture - pdf, html

Miscellaneous material

  • Semihosting for AArch32 and AArch64 - pdf, html

download bundle

PDFs of all the above specifications have also been bundled in this zip file.

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The biggest change in this release is the addition of 10 converted specifications:

  • Procedure Call Standard for the Arm Architecture (aapcs32)
  • ELF for the Arm Architecture (aaelf32)
  • DWARF for the Arm Architecture (aadwarf32)
  • C++ ABI for the Arm Architecture (cppabi32)
  • Run-time ABI for the Arm Architecture (rtabi32)
  • DWARF for the Arm 64-bit Architecture (aadwarf64)
  • PAuth ABI Extension to ELF for the Arm 64-bit Architecture (pauthabielf64)
  • Morello Extension to the Procedure Call Standard for the Arm 64-bit Architecture (aapcs64)
  • Morello Extension to ELF for the Arm 64-bit Architecture (aaelf64)
  • Morello Extension to DWARF for the Arm 64-bit Architecture (aadwarf64)
  • Semihosting for AArch32 and AArch64 (semihosting)

In addition, both the 32-bit and 64-bit versions of the Dwarf ABI specs gained Thread ID register number assignments, and in the 64-bit version of the Dwarf ABI spec, the PC was added as a register.

the specifications included in this release

ABI for the Arm 32-bit Architecture

  • Procedure Call Standard for the Arm Architecture - pdf, html
  • ELF for the Arm Architecture - pdf, html
  • DWARF for the Arm Architecture - pdf, html
  • C++ ABI for the Arm Architecture - pdf, html
  • Exception Handling ABI for the Arm Architecture - pdf, html
  • Run-time ABI for the Arm Architecture - pdf, html
  • C Library for the Arm Architecture - pdf, html
  • Addenda to, and Errata in, the ABI for the ARM Architecture - pdf, html

ABI for the Arm 64-bit Architecture

  • Procedure Call Standard for the Arm 64-bit Architecture - pdf, html
  • ELF for the Arm 64-bit Architecture - pdf, html
  • DWARF for the Arm 64-bit Architecture - pdf, html
  • Vector Function ABI for the Arm 64-bit Architecture - pdf, html

PAuth ABI Extension

  • PAuth ABI Extension to ELF for the Arm 64-bit Architecture - pdf, html

Morello Extension

  • Morello Extension to the Procedure Call Standard for the Arm 64-bit Architecture - pdf, html
  • Morello Extension to ELF for the Arm 64-bit Architecture - pdf, html
  • Morello Extension to DWARF for the Arm 64-bit Architecture - pdf, html

Miscellaneous material

  • Semihosting for AArch32 and AArch64 - pdf, html

download bundle

PDFs of all the above specifications have also been bundled in this zip file.

other specifications

For the other ABI specifications, please go to: https://developer.arm.com/architectures/system-architectures/software-standards/abi

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The biggest change in this release is the addition of 4 new documents:

  • Exception Handling ABI for the Arm Architecture
  • C Library for the Arm Architecture
  • Addenda to, and Errata in, the ABI for the ARM Architecture
  • ELF for the Arm 64-bit Architecture

Additionally, we've specified ABI handling for 8.7-A's new FPCR bits in the aapcs64 and we added a missing table entry for Tag_DSP_extension in the addenda32 document (as compared to the latest version up on developer.arm.com).

the documents included in this release

ABI for the Arm 32-bit Architecture:

  • Exception Handling ABI for the Arm Architecture - pdf, html
  • C Library for the Arm Architecture - pdf, html
  • Addenda to, and Errata in, the ABI for the ARM Architecture - pdf, html

ABI for the Arm 64-bit Architecture:

  • Procedure Call Standard for the Arm 64-bit Architecture - pdf, html
  • ELF for the Arm 64-bit Architecture - pdf, html
  • Vector Function ABI for the Arm 64-bit Architecture - pdf, html

For other ABI documents, please go to: https://developer.arm.com/architectures/system-architectures/software-standards/abi

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The following documents are included in this 2020Q2 release:

  • Procedure Call Standard for the Arm® 64-bit Architecture (AArch64) - pdf, html
  • Vector Function Application Binary Interface Specification for AArch64 - pdf, html

For other ABI documents, please go to: https://developer.arm.com/architectures/system-architectures/software-standards/abi

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This is the first release of Application Binary Interface for the Arm® Architecture documents on Github.

In this Github release, only two documents are included:

  • Procedure Call Standard for the Arm® 64-bit Architecture (AArch64) - pdf, html
  • Vector Function Application Binary Interface Specification for AArch64 - pdf, html

For other ABI documents, please go to: https://developer.arm.com/architectures/system-architectures/software-standards/abi