This is a very simple implementation of a LEGv8 Processor, which is a subset of ARMv8. The goal of this project is to implement most (preferably all) of the information contained in the LEGv8 Reference Guide.
This project was originally created as part of ELC 3338 at Baylor University. I heavily enjoyed the project, and chose to continue the development of the processor on my own.
Sidenote to any possible ELC 3338 students who have stumbled across this repository: I've made certain choices to intentionally make this repository hard to copy from. I'd recommend not copying anything from this repo.
There are three projects in this repository:
- nonpipelined/: This is the single-stage, nonpipelined version of the processor.
- pipelined/: (TODO) This is the pipelined version of the processor, with no data forwarding or hazard protection.
- pipelined-forward-hazard/: (TODO) This is the pipelined version of the processor, with both data forwarding and hazard protection.
Nonpipelined:
Initially, this project supported eight instructions: ADD, SUB, AND, ORR, LDUR, STUR, B, CBZ. The goal is to eventually support all of the instructions referenced in the LEGv8 Reference Guide. These are as follows:
- ADD
- ADDI
- ADDIS
- ADDS
- AND
- ANDI
- ANDIS
- ANDS
- B
- B.cond
- BL
- BR
- CBNZ
- CBZ
- EOR
- EORI
- LDUR
- LDURB
- LDURH
- LDURSW
- LDXR
- LSL
- LSR
- MOVK
- MOVZ
- ORR
- ORRI
- STUR
- STURB
- STURH
- STURW
- STXR
- SUB
- SUBI
- SUBIS
- SUBS
- CMP
- CMPI
- LDA
- MOV
- FADDS
- FADDD
- FCMPS
- FCMPD
- FDIVS
- FDIVD
- FMULS
- FMULD
- FSUBS
- FSUBD
- LDURS
- LDURD
- MUL
- SDIV
- SMULH
- STURS
- STURD
- UDIV
- UMULH
As this project was primarily about learning, I took a lot of inspiration from other similar projects. They are listed below:
- https://github.com/danshanley/FPU - Huge help on some FPU algorithms which I couldn't quite figure out myself.