ARM Assembly Programming: Master the Essentials

Understand endianness by comparing little endian and big endian byte order, where the least and most significant bytes occupy memory addresses. See a 32-bit example and stack behavior.

Explore ARM registers, including the 30 general purpose registers in 32-bit architecture, R0–R15 mappings to Intel equivalents, the stack pointer, link register, program counter, CPSR flags, and endianness.

Explore the basics of ARM instructions, including mnemonics, optional suffix, and conditional execution, with operands as registers or immediates, and categories like data processing, load/store, branch, control, and shift instructions.

Master the move instruction in arm assembly by transferring data between registers or loading an immediate value, demonstrated with r0 and r1, using the Armv7 web-based simulator.

Explore the sub instruction in ARM assembly for subtracting two operands. Destination register holds the result; source one must be a register, source two may be a register or immediate.

Explore ARM load and store instructions (LDR and STR) that move data between registers and memory, using data sections, immediate values, and address addressing with equal signs and brackets.

Master how to use ARM LDM and STM instructions to load and store multiple registers from and to consecutive memory, including addressing modes IA, increment and decrement options.

Learn to perform bitwise operations in ARM assembly, including and, or, xor, and not (mvn), use beq, tst, and teq to update cpsr flags for conditional branching.

Master shift and rotate operations in arm assembly, including lsl, lsr, asr, and rotate right with extent using carry flag, to manipulate bits and relate shifts to multiplication and division.

Explore how the stack, a downward-growing memory region, uses push to save registers and decrease the stack pointer, and how pop restores data and increases the pointer.