Rajat Jain <rajatjain@xxxxxxxxxxx> writes:
> [...] I have a memory location (One of the fields in a kernel data
> structure) and I want to track down the code that changes the value
> of that particular location. Some thing like a "watchpoint".
See the register_wide_hw_breakpoint API. You could write a small
module that runs early, and gets callbacks when a given address is
modified.
> And this is early while I am still booting up. Can some one tell me
> if it is possible to do so?
(Were it not for the 'while still booting up' part, I'd suggest trying
systemtap's
probe kernel.data("SYMBOL").write { }
or probe kernel.data(0xDEADBEEF).write { }
probes, but we haven't worked through initramfs'ifying the widget.)
- FChE
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