Computer system with watchpoint support

Details Computer system with watchpoint support Computer system with watchpoint support

2006-05-16

2006-05-16

Dam, Tuan (Department: 2192)

Data processing: software development, installation, and managem

Software program development tool

Testing or debugging

C714S034000, C712S244000, C710S266000

Reexamination Certificate

active

07047520

ABSTRACT:
A method is provided that allows a general set of watchpoints to be defined for a computer system (a watchpoint is a memory address that triggers an interrupt for debugging or tracing purposes). This is accomplished by modifying the system page table for the memory page containing a watchpoint, such that a page fault interrupt is triggered whenever said memory page is accessed (for example by marking the page as not present). The paging mechanism of the computer system is then adapted, so that responsive to a page fault interrupt, a determination is made as to whether such interrupt has resulted from an access to the watchpoint, and if so, control is passed to a watchpoint handler. Alternatively, if there is no watchpoint, normal paging operations can be resumed if necessary.

REFERENCES:
patent: 5598553 (1997-01-01), Richter et al.
patent: 5611043 (1997-03-01), Even et al.

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