[Dwarf-Discuss] .debug_frame and the base address

Robert Harris robert.m.harris at oracle.com
Mon Sep 24 07:15:40 PDT 2018


I'd like some clarification regarding what precisely needs to be relocated relative to
the object load address when interpreting .debug_frame.  I'm interested in versions
2, 3 and 4.

I think the only explicit mention of relocation in DWARF 4 is § 6.4.1:

	Abstractly, this mechanism describes a very large table...
	...
	The first column indicates an address for every location that contains
	code in a program. (In shared objects, this is an object-relative offset.)

Thus adjustments need to be made to only

	An FDE's initial_location field
	DW_CFA_set_loc's operand

Have I missed anything?  I see some ambiguity in the definition of
DW_CFA_def_cfa_expression and it's making me wonder if there are any
other occasions when a result would require relocation.

Robert Harris
	


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