A source library xPack with the µOS++ Arm AArch64 architecture definitions

This project provides the architecture-aarch54 source library as an xPack dependency and includes architecture definitions for AArch64 embedded projects.

The project is hosted on GitHub as micro-os-plus/architecture-aarch64-xpack.

Maintainer info

This page is addressed to developers who plan to include this source library into their own projects.

For maintainer info, please see the README-MAINTAINER file.

Install

As a source library xPack, the easiest way to add it to a project is via xpm, but it can also be used as any Git project, for example as a submodule.

Prerequisites

A recent xpm, which is a portable Node.js command line application.

For details please follow the instructions in the xPack install page.

xpm

This package is available from npmjs.com as @micro-os-plus/architecture-aarch64 from the npmjs.com registry:

cd my-project
xpm init # Unless a package.json is already present

xpm install @micro-os-plus/architecture-aarch64@latest

ls -l xpacks/micro-os-plus-architecture-aarch64

Git submodule

If, for any reason, xpm is not available, the next recommended solution is to link it as a Git submodule below an xpacks folder.

cd my-project
git init # Unless already a Git project
mkdir -p xpacks

git submodule add https://github.com/micro-os-plus/architecture-aarch64-xpack.git \
  xpacks/micro-os-plus-architecture-aarch64

Branches

Apart from the unused master branch, there are two active branches:

• xpack, with the latest stable version (default)
• xpack-develop, with the current development version

All development is done in the xpack-develop branch, and contributions via Pull Requests should be directed to this branch.

When new releases are published, the xpack-develop branch is merged into xpack.

Developer info

Overview

This source xPack provides general AArch64 definitions.

Status

The architecture-aarch64 source library is fully functional, but minimalistic, for running semihosted tests.

Build & integration info

The project is written in C++ and assembly and it is expected to be used in C and C++ projects.

The source code was compiled with aarch64-none-elf-gcc 11 and should be warning free.

To ease the integration of this package into user projects, there are already made CMake and meson configuration files (see below).

For other build systems, consider the following details:

Include folders

The following folders should be passed to the compiler during the build:

• include

The header files to be included in user projects are:

#include <micro-os-plus/architecture.h>

Source files

The source files to be added to user projects are:

• none

Preprocessor definitions

• none

Compiler options

• -std=c++20 or higher for C++ sources
• -std=c11 for C sources

C++ Namespaces

Portable:

• micro_os_plus::architecture
• micro_os_plus::architecture::registers

Architecture specific:

• aarch64::architecture
• aarch64::architecture::registers

C++ Classes

• none

Dependencies

• none

CMake

To integrate the architecture-aarch64 source library into a CMake application, add this folder to the build:

add_subdirectory("xpacks/micro-os-plus-architecture-aarch64")`

The result is an interface library that can be added as an application dependency with:

target_link_libraries(your-target PRIVATE

  micro-os-plus::architecture-aarch64
)

meson

To integrate the architecture-aarch64 library into a meson application, add this folder to the build:

subdir('xpacks/micro-os-plus-architecture-aarch64')

The result is a dependency object that can be added to an application with:

exe = executable(
  your-target,
  link_with: [
    # Nothing, not static.
  ],
  dependencies: [
    micro_os_plus_architecture_aarch64_dependency,
  ]
)

Examples

#include <micro-os-plus/architecture.h>

using namespace micro_os_plus;

architecture::register_t reg;

reg = architecture::registers::sp();

Known problems

• does not use CMSIS Core (yet)

Tests

TBD

Change log - incompatible changes

According to semver rules:

Major version X (X.y.z | X > 0) MUST be incremented if any backwards incompatible changes are introduced to the public API.

The incompatible changes, in reverse chronological order, are:

• v3.x: first AArch64 release

(previous releases were part of architecture-cortexa)

License

The original content is released under the MIT License, with all rights reserved to Liviu Ionescu.