International Business Machines Corporation

Michel Henri Hack

Nagui Halim

Casper A Scalzi

Richard Pervin King

Carl Edward Clark

Bhaskar Sinha

Alan I Alpert

Frank N Eskesen

Richard J Schmalz, Deceased

A memory in a computer system includes a visible portion and a hidden portion. The visible portion of the memory is addressable by a processor and the operating system operating within the computer system. Addressability by either the processor or the operating system is excluded to the hidden portion of the memory. The hidden portion of the memory is used for storing data transmitted by either the processor or the operating system. A communications area, located in the visible portion of memory receives requests for data access from either the processor or the operating system. A hidden server which addresses both the visible portion of memory and the hidden portion of memory receives requests for data access from the communications area and initiates data access from the hidden memory.

Method and apparatus for protecting portions of memory by providing

Provides a dynamic execution link between an analyzer program and each hook instruction in a program. Special types of hook instructions are provided for use in a hooked program. The link causes the analyzer program to execute as part of a continuous uninterrupted execution for each hook instruction. The link uses hardware and/or internal code to access a hook control area which provides linkage information needed to invoke the execution of the analyzer program upon completion of the hook instruction and to continue the execution of the hooked program following the completion of the analyzer program. The linkage information includes the entry location into the analyzer program, and also locates the first hook work area (HWA) of a sequence of HWAs, from which an HWA is assigned to each current hook instruction. The assigned HWA stores a return point location in the hooked program at an instruction following the current hook instruction. One or more hooked programs may concurrently use the same analyzer program. As soon as execution by the analyzer program ends for a hook instruction, its assigned HWA is released for use by another hook instruction.

Dynamic program analyzer facility

Growing community of inventors

Peekskill, NY, United States of America

Michel Henri Hack