Method for safely instrumenting large binary code

Details Method for safely instrumenting large binary code Method for safely instrumenting large binary code

2007-09-11

2007-09-11

Steelman, Mary (Department: 2191)

Data processing: software development, installation, and managem

Software program development tool

Translation of code

C717S110000, C717S112000, C717S130000, C717S170000

Reexamination Certificate

active

10315967

ABSTRACT:
A method is provided for safely editing a binary code to be executed on a computer system. The method allows the binary code to be directly edited without compromising its integrity. More specifically, a larger binary code is transformed into a number of smaller binary code segments having sizes within a reference range of a control transfer function such as a branch instruction. A branch slamming operation can then used to displace a binary instruction contained within a smaller binary code segment with a branch instruction referring to a binary patch that is appended to the smaller binary code segment. The binary instruction displaced by the branch instruction is preserved in the binary patch. Upon completion of the binary patch execution, the smaller binary code segment continues executing with a binary instruction immediately following the branch instruction. The method for safely editing the binary code is particularly useful with large binary codes having sizes greater than the reference range of the control transfer function.

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