Hex To Arm Converter =link= May 2026

Hex to ARM Converter — Deep Technical Guide

Anatomy of an ARM Instruction (32-bit)

Example: MOV R1, #42
Hex encoding: 2A 10 A0 E3 (little-endian representation)

Breaking down E3A0102A (big-endian):

• Bits 31-28: Condition code (E = Always)
• Bits 27-25: Opcode type
• Bits 24-21: Opcode (MOV)
• Bits 20: S-bit (update flags)
• Bits 19-16: Rn (not used)
• Bits 15-12: Rd (R1)
• Bits 11-0: Immediate value (#42)

The converter handles all this so you don't have to. hex to arm converter

Initialize disassembler for ARM mode (32-bit, little-endian)

md = Cs(CS_ARCH_ARM, CS_MODE_ARM)

4.1 Command Line Utilities

• GNU Binutils (objdump): The standard toolchain for ARM development.
  • Usage: arm-none-eabi-objdump -d file.elf (Disassembles ELF to Assembly).
  • Usage: arm-none-eabi-objcopy -O binary file.elf file.bin (Converts ELF/Hex to Binary).
• Hexdump / xxd: Linux utilities for viewing hex representations of binary files, often used in conjunction with ARM cross-compilers.

🔴 ARM vs. Thumb Mode Mismatch

• Hex 70 47 in Thumb mode = BX LR (return)
• Same bytes in ARM mode = corrupted instruction

Fix: Know your target CPU. Cortex-M → Thumb. Cortex-A running Linux → usually ARM. Hex to ARM Converter — Deep Technical Guide

Handling AArch64 Specifics

• Logical immediates use complex encoding; implement canonical immediate generation algorithm (see ARM ARM).
• PC-relative ADR/ADRP pair handling: detect pair and combine into a single label/address.
• Conditional branches use inverted condition codes in some encodings; map to human-readable mnemonics.
• Exception and branching variants: compare-and-branch, conditional select (CSINC/CSINV), and advanced SIMD/floating-point encodings.

Output Formats & Features

• Plain assembly text (GNU/ARM syntax, Intel-style optional).
• Annotated disassembly with comments for resolved addresses, constants, and pseudo-instruction expansions.
• Intermediate representation (IR) for static analysis or lifting to lifters (e.g., VEX, BAP, LLVM IR).
• JSON or structured output with fields: addr, size, bytes, mnemonic, operands, implicit regs, semantics.