System, method and computer program product for on-the-fly...

Details System, method and computer program product for on-the-fly... System, method and computer program product for on-the-fly...

2003-12-02

2008-12-30

Zhen, Wei Y (Department: 2191)

Data processing: software development, installation, and managem

Software upgrading or updating

C712S233000, C719S331000

Reexamination Certificate

active

07472384

ABSTRACT:
On-the-fly patching of executable code includes placing a block of modified instructions in memory, identifying a block of code to be patched, storing instructions to be patched from the block of code to be patched in a storage location, change the instructions to be patched to mark instructions, and adding a jump to the block of modified instructions in the block of code. Prior to the placing and the identifying steps, a write flag for a page in memory where the block of code to be patched is located is set to allow writes, and interrupts are masked. The instructions are replaced in reverse order. The mark instructions are the same length, in bytes, as the instructions to be patched. The modified instructions include a resolver to determine a number of instructions of the block of code to be patched that had already been executed.

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