Huawei Cloud Developer Alliance

Apr 21, 2020 · Fundamentals

Understanding ARMv8‑A Execution States: AArch64 vs AArch32

This article explains the two execution states of the ARMv8‑A architecture—AArch64 (64‑bit) and AArch32 (32‑bit)—detailing their supported register widths, instruction sets, exception models, virtual memory architecture, and programmer models, and highlights the key differences and transition mechanisms between them.