Single instruction method of seizing control of program executio

Details Single instruction method of seizing control of program executio Single instruction method of seizing control of program executio

1997-04-11

2000-01-11

Lim, Krisna

Electrical computers and digital processing systems: processing

Processing control

Branching

712210, G06F 930, G06F 938, G06F 944

Patent

active

060147407

ABSTRACT:
A single-instruction method of diverting or "hooking" the operation of software entails setting up a work area of code at an address within the range of a relative branching instruction type defined in the operating-system architecture. Hooking is accomplished by patching the software in question to insert a single relative-branch instruction. That instruction causes program execution to be diverted to the work area. In one embodiment, the work area is an area of memory that normally is used only for system initialization and thus would not otherwise be executed by the processor system after system initialization is complete.

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