	Services and Modeling for Embedded Software Development

Howto: Implementing LLVM Integrated Assembler

A Simple Guide

Simon Cook

Embecosm

Application Note 10. Issue 1

October 2012

Copyright © 2012 Embecosm Limited

Creative Commons License

The document entitled "Howto: Implementing LLVM Integrated Assembler" by Jeremy Bennett of Embecosm is licensed under a Creative Commons Attribution 2.0 UK: England & Wales License. See the Legal Notice for details.

Table of Contents

1. Introduction

1.1. Target Audience
1.2. Examples
1.3. Further Information
1.4. About Embecosm Application Notes

2. Integrated Assembler within LLVM

2.1. llvm-mc

3. Implementing Assembly Parser Support

3.1. LLVM Build System
3.2. archASMParser Class
3.3. archOperand Structure
3.4. Matching and Emitting Instructions
3.5. Parsing Registers and Immediates
3.6. Parsing Operands
3.7. Parsing Instructions
3.8. Testing

4. Implementing Instruction Encoding

4.1. Build System
4.2. Registration
4.3. Register Support Function
4.4. Encoding Instructions
4.5. Encoding Custom Operands
4.6. Testing

5. Implementing Instruction Decoding

5.1. TableGen Requirements
5.2. Build System
5.3. Integration
5.4. Disassembler
5.5. Variable Length Instructions
5.6. Decoding Register Classes
5.7. Decoding Custom Operands
5.8. Testing

6. Implementing ELF Object Writing

6.1. Build System
6.2. Defining Fixups and Relocations
6.3. Assembly Backend
6.4. ELF Object Writer
6.5. Testing

Next

Chapter 1. Introduction

Copyright © 2012 Embecosm Limited