Firstly, please forgive me if the questions I ask are ignorant. I'm on a
steep learning curve at present.
I want to display the value of a variable in my loadable module, but of
course gdb vmlinux /proc/kcore can't do that.
I believe that I should be able to get at that value via /dev/mem or
/dev/kmem, given that I know the address of the variable.
The question is, how do I do that? To reach that goal, using /dev/mem, I
assume I need to determine where my module was loaded into physical
memory. My understanding is that kernel memory is contiguous and is a
simple direct mapping from kernel virtual addresses to the physical
addresses. (I guess there may be a discontinuity between where the kernel
proper is loaded and where modules are loaded though.)
Once I know where it's loaded, I should then be able to use od to dump the
appropriate bytes. eg. If it's loaded at 0x200000 (say) then if I dump the
memory at 0x200000 + <my variable's offset from start of module> then I
should get its value, right?
Is there another, better technique, maybe using kmem?
Any help or pointers are much appreciated.
Thanks,
Dave
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