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An answer to a similar question here mentions that the entry of a windows service can be patched to allow attaching a debugger (in my case x64dbg). Google searches on the topic are all related to setting a breakpoint in the source.
I'd like to know how exactly this is done when only a binary is available.
I'm trying to port a windows service to Linux. I'm not very familiar with the windows OS. While I can step through normal routines, the service probes the hardware and sets up a few global values. For this reason I need to know exactly what is being sent/received during its initialization.
I did try windbg but found it to be very difficult to use when no source code is present.