RISC-V emulator

memo

• Writing a RISC-V Emulator in Rust
• HackerNews - Writing a RISC-V Emulator from Scratch
• The Adventures of OS: Making a RISC-V Operating System using Rust
• RISC-V ELF psABI
• riscv-emu (Go)
• RISC-V Instruction Formats
• github.com/johnwinans/rvalp - RISC-V Assemly Language Programming
• Writing a simple RISC-V emulator in plain C
• Japanese
  • RISC-Vを実装してみる

Install tool-chain

• macOS should install using homebrew.
  • see: https://github.com/riscv-software-src/homebrew-riscv

Instructions

RISC-V has been defined 6-type instructions

• R-format
  • instructions using 3 register inputs
  • add, xor, mul - arithmetic/logical ops
• I-format
  • instructions with immediates, loads
  • addi, lw, jalr, slli
• S-format
  • store instructions
  • sw, sb
• U-format
  • instructions with upper immediates
  • lui, auipc - upper immediate is 20-bits
• SB-format
  • branch instructions
  • beq, bge
• UJ-format
  • jump instructions
  • jal