Dynamic Instruction Stream Editing (DISE) is a cooperative software-hardware scheme for efficiently adding customization functionality---e.g, safety/security checking, profiling, dynamic code decompression, and dynamic optimization---to an application. In DISE, application customization functions (ACFs) are formulated as rules for macro-expanding certain instructions into parameterized instruction sequences. The processor executes the rules on the fetched instructions, feeding the execution engine an instruction stream that contains ACF code. Dynamic instruction macro-expansion is widely used in many of today's processors to convert a complex ISA to an easier-to-execute, finer-grained internal form. DISE co-opts this technology and adds a programming interface to it.DISE unifies the implementation of a large class of ACFs that would otherwise require either special-purpose hardware widgets or static binary rewriting. We show DISE implementations of two ACFs---memory fault isolation and dynamic code decompression---and their composition. Simulation shows that DISE ACFs have better performance than their software counterparts, and more flexibility (which sometimes translates into performance) than hardware implementations.
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DISE: a programmable macro engine for customizing applications
Corliss, Marc L.; Lewis, E. Christopher; Roth, Amir
Follow ACM SIGARCH Computer Architecture News
, Volume 31 (2)
Association for Computing Machinery – May 1, 2003
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