MorFuzz

DifuzzRTL

DifuzzRTL is a differential fuzz testing framework specifically designed for CPU verification. It introduces a novel coverage metric called register-coverage to comprehensively capture RTL design states and guide input generation, then cross-checks results against an ISA simulator to detect bugs. ## Key Features - **Register-Coverage Metric** — A new coverage approach that comprehensively captures RTL design states to guide fuzzing input generation - **Differential Testing** — Cross-checks RTL simulation results against an ISA simulator to identify discrepancies and bugs - **Automatic Instrumentation** — Automatically instruments register-coverage into target RTL designs - **Instruction Mutation** — Randomly generates and mutates instructions defined in the ISA for comprehensive testing - **CPU Bug Detection** — Specifically designed to find bugs in CPU implementations through systematic fuzzing ## Philosophy DifuzzRTL takes a differential approach to CPU verification, combining coverage-guided fuzzing with cross-checking against reference models to systematically uncover bugs in RTL implementations.