Binary instrumentation tools are widely used to facilitate the development of hardware and software systems. Traditionally, these tools are designed around a fixed Instruction Set Architecture (ISA) specification. However there is a shift in the architectural community towards open ISAs, whose key feature is the ability to add custom ISA extensions. The lack of extensibility in traditional binary instrumentation tools limits their capacity to adapt to these evolving ISAs, thus hindering their ability to analyze and modify binaries built for open ISAs.

To address this challenge, we present R-Visor, a modular and extensible Dynamic Binary Instrumentation (DBI) framework designed for open ISAs by allowing seamless integration of new extensions for instrumentation. R-Visor uses a cache-based just-in-time execution model to run application binaries while supporting advanced instrumentation routines at multiple granularities.
R-Visor leverages ArchVisor, a new Domain-Specific Language (DSL) that allows users to write specifications for ISAs and extensions, enabling seamless extensibility.
Our implementation of R-Visor on the RISC-V architecture shows that on average R-Visor incurs \textbf{1.81$\times$} less overhead while utilizing 2.64$\times$ less memory than DynamoRIO, an industry standard DBI. Through ArchVisor, R-Visor requires \textbf{9.30$\times$} less code than DynamoRIO to support the F (floating point) and C (compressed) extensions.