Importance

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Abstract

A base function provides a base function semantic. During service installation, an unconditional branch instruction to a service function replaces one or more instructions at the beginning of a base function. The service function provides a service semantic such as instrumentation, redirection, replacement, or extension. After service installation, a pass function includes the replaced base function instructions and an unconditional branch instruction to the logically subsequent base function instruction. Thus, the pass function provides a service-free base function semantic. The service function calls the pass function an arbitrary number of times before and/or after executing any other service function instructions. The pass function is allocated statically or dynamically. A statically allocated pass function is callable before and/or after service installation to guarantee a service-free base function semantic. A service removal function restores a base function and conforms a pass function to the restored base function. A pass function is callable before and/or after service removal. A library of service installation functions includes functions for installing and removing a service on a base function. A library of binary editing functions includes functions for attaching service installation functions and associated data payloads to a binary file.

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First Claim