[Dwarf-Discuss] Register kinds
Bishop, John E
john.e.bishop at intel.com
Mon Nov 1 10:55:27 PDT 2010
> The key here is that the debugger must use a runtime mapping from
> the register number "cookie" that's dropped into the DWARF to the real
> hardware register number. In fact, at runtime, the cookie might map to
> a hardware register, a memory address, or nowhere,...
This is apparently the province of the "ABI" for the platform concerned.
I never did find a document which claimed to be "The ABI" for my platform
but luckily there was a ".h" file shared between the compiler team and
the debugger team which included an enumeration of register names. Both
sides thus knew what hardware register was represented by a particular
integer in the DWARF.
It's not elegant but it worked for us. Unfortunately, if you don't have
both sides in one company I guess you have to either find an ABI document
or do experiments to see what the compiler issues or what the debugger
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