[RFC 00/13] MIPS64 support

[Mark Wielaard]

Hi,

I didn't review any of the patches yet, but noticed this:

On Thu, Jul 31, 2014 at 11:21:05PM +0300, Crestez Dan Leonard wrote:
> Inside loc2c the CU address_size is used to determine the max_fetch_size,
> this becomes incorrect with -msym32. Handling this (patch 8) requires
> access to the elf header which requires a lot of code churn (patch 7).
> This could be avoided if elfutils exported a dwarf_die_getdwarf but this
> would be a new elfutils API.

I believe Josh Stone also wanted a function like that (although I don't
remember for what, so maybe I am wrong). I think it would be reasonable
to have such a new function to get at the Dwarf from either a Dwarf_Die
or Dwarf_CU (which might be helpful if all you have is an Dwarf_Attribute).

> Apparently -msym32 also affects the FDE data for unwind support. It's not
> clear how to detect it cleanly in there. Apparently an "address_size" field
> can be included in the CIE, but I don't have it. Both eu-readelf and
> binutils readelf show corrupt FDEs. Patches 12 and 13 are evil hacks.
> Presumably I could try to interpret initial_address both ways and attempt
> to lookup the CU?

Do you have an example ELF/DWARF file that shows this issue?

Thanks,

Mark