AArch32 - the legacy 32-bit instruction set architecture (ISA) defined by ARM, including Thumb mode execution. AArch64 - the new 64-bit instruction set architecture (ISA) defined by ARM. ARMv7 - the specification of the "7th generation" ARM hardware, which only includes support for AArch32. This version of the ARM hardware is the first Announced in October 2011, ARMv8-A represents a fundamental change to the ARM architecture. It adds an optional 64-bit architecture, named "AArch64", and the associated new "A64" instruction set. AArch64 provides user-space compatibility with the existing 32-bit architecture ("AArch32" / ARMv7-A), and instruction set ("A32"). The 16-32bit Thumb instruction set is referred to as "T32" and has AArch64 has a single instruction set, called "A64", in which all instructions have 32 bits. The encoding is relatively simple and consistent, which makes it possible in some cases to deduce properties of an instruction without fully decoding it. For example, a general-purpose register operand is encoded in one of four positions in the This document provides a high-level overview of the ARMv8 instructions sets, being mainly the new A64 instruction set used in AArch64 state but also those new instructions added to the A32 and T32 instruction sets since ARMv7-A for use in AArch32 state. For A64 this document specifies the preferred architectural assembly What is the difference between LDAXR & LDXR instructions out of AArch64 instruction set?. From reference manual they looks totally the same (with exception of 'acquire' word): LDAXR - Load-Acquire Exclusive Register: loads word from memory addressed by base to Wt. Records the physical address as an exclusive access. Use of the word "partner" in reference to Arm's customers is not intended to create or refer to any partnership relationship with any other company. Arm may make changes to this document at Chapter B2 AArch64 System registers Instruction Register ®™ ®™ Part of the 32-bit architecture execution environment now referred to as AArch32. A64 is a 64-bit fixed-length instruction set that offers similar functionality to the ARM and Thumb instruction sets. Introduced with ARMv8-A, it is the AArch64 instruction set. ARM ISAs are constantly improving to meet the increasing demands of leading edge This issue of the Arm® Architecture Reference Manual Supplement Armv8, for Armv8-R AArch64 architecture profile contains many improvements and corrections. Validation of this document ha s identified the following issues that Arm will address in Part E A64 Instruction Set for Armv8-R AArch64 Chapter E1 A64 Instruction Set for Armv8-R AArch64 ARM is a family of Reduced Instruction Set Computer (RISC) architectures for computer processors that has become the predominant CPU for smartphones. ARMv8 A64 Quick Reference. AArch64 MMU. The AArch64 MMU is used to convert from virtual address to physical address and setting the memory attributes, such as access permissions that include ARMv8 (AArch64, ARM64) opcodes list. I'm sorry for such as questions where answer would seem to be easily searched in google Some time ago I have seen table/list of ARMv8 instructions with opcodes and it was perfect, but I lost link. Now I'm trying to find at least some sources where opcodes of instructions listed and can't.