Armed Cats

Author:

Alglave Jade1,Deacon Will2,Grisenthwaite Richard2,Hacquard Antoine3,Maranget Luc4

Affiliation:

1. Arm Ltd and University College London

2. Arm Ltd

3. EPITA Research and Development Laboratory

4. INRIA

Abstract

We report on the process for formal concurrency modelling at Arm. An initial formal consistency model of the Arm achitecture, written in the cat language, was published and upstreamed to the herd+diy tool suite in 2017. Since then, we have extended the original model with extra features, for example, mixed-size accesses, and produced two provably equivalent alternative formulations. In this article, we present a comprehensive review of work done at Arm on the consistency model. Along the way, we also show that our principle for handling mixed-size accesses applies to x86: We confirm this via vast experimental campaigns. We also show that our alternative formulations are applicable to any model phrased in a style similar to the one chosen by Arm.

Publisher

Association for Computing Machinery (ACM)

Subject

Software

Reference42 articles.

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2. Richard Gooch and Pekka Enberg. 2005. Linux Kernel Virtual File System (VFS). https://www.kernel.org/doc/html/latest/filesystems/vfs.html Richard Gooch and Pekka Enberg. 2005. Linux Kernel Virtual File System (VFS). https://www.kernel.org/doc/html/latest/filesystems/vfs.html

3. RISC-V. 2019. The RISC-V Instruction Set Manual Volume I: Unprivileged ISA. https://content.riscv.org/wp-content/uploads/2019/12/riscv-spec-20191213.pdf. RISC-V. 2019. The RISC-V Instruction Set Manual Volume I: Unprivileged ISA. https://content.riscv.org/wp-content/uploads/2019/12/riscv-spec-20191213.pdf.

4. Arm Ltd. 2020. Arm Memory Model. https://developer.arm.com/architectures/cpu-architecture/a-profile/memory-model-tool. Arm Ltd. 2020. Arm Memory Model. https://developer.arm.com/architectures/cpu-architecture/a-profile/memory-model-tool.

5. Arm Ltd. 2020. Armv8 for Armv8-A architecture profile. In Arm Architecture Reference Manual Vol. ARM DDI 0487F.c. https://developer.arm.com/docs/ddi0487/latest/arm-architecture-reference-manual-armv8-for-armv8-a-architecture-profile. Arm Ltd. 2020. Armv8 for Armv8-A architecture profile. In Arm Architecture Reference Manual Vol. ARM DDI 0487F.c. https://developer.arm.com/docs/ddi0487/latest/arm-architecture-reference-manual-armv8-for-armv8-a-architecture-profile.

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