> On Sep 24, 2018, at 8:44 AM, Robert Harris <robert.m.har...@oracle.com> wrote:
>
>
>
>> On 24 Sep 2018, at 15:33, Greg Clayton <clayb...@gmail.com> wrote:
>>
>>
>>
>>> On Sep 24, 2018, at 7:15 AM, Robert Harris via Dwarf-Discuss
>>> <dwarf-discuss@lists.dwarfstd.org> wrote:
>>>
>>> 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 ยง 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.
>>
>> Any DWARF expression can contain a DW_OP_addr, which has an address
>> argument, and would need to be relocated.
>
> Do you mean that DW_OP_addr's argument should be relocated in all instances
> of a DWARF expression, i.e. in other .debug_ sections, or just in the context
> of
> .debug_frame?
I was specifically talking about DWARF expressions in any .debug_frame info.
But in general, yes, any DWARF expression that contains a DW_OP_addr might need
a relocation for its address argument.
Greg
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