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Handling debugger breakpoints in a shared instruction system

United States Patent

January 21, 2014
View the Complete Patent at the US Patent & Trademark Office
A debugger debugs processes that execute shared instructions so a breakpoint set for one process will not cause a breakpoint to occur in the other processes. A breakpoint is set by recording the original instruction at the desired location and writing a trap instruction to the shared instructions at that location. When a process encounters the breakpoint, the process passes control to the debugger for breakpoint processing if the breakpoint was set at that location for that process. If the trap was not set at that location for that process, the cacheline containing the trap is copied to a small scratchpad memory, and the virtual memory mappings are changed to translate the virtual address of the cacheline to the scratchpad. The original instruction is then written to replace the trap instruction in the scratchpad, so the process can execute the instructions in the scratchpad thereby avoiding the trap instruction.
Gooding; Thomas Michael (Rochester, MN), Shok; Richard Michael (Rochester, MN)
International Business Machines Corporation (Armonk, NY)
12/ 255,138
October 21, 2008
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with U.S. Government support under Contract No. B554331 awarded by the U.S. Department of Energy. The U.S. Government has certain rights in this invention.