Setting kernel data breakpoints on x86

I'm trying to debug a rather difficult data-overwriting problem, and it 
would be a big help to be able to use a data breakpoint.

Is there any easy way of doing this?  I'd prefer not to use a kernel 
debugger, because the address of the breakpoint and the time when it's 
needed are determined dynamically.

Does anybody have a little lightweight procedure for setting one of the 
x86's debug registers to point to a particular location in kernel memory 
space?  I don't care if the whole system crashes when the debug exception 
occurs, just so long as I can get a stack trace and find out where the 
overwrite comes from.

Alan Stern

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