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Re: elfutils/libdw ARM compilation (native and cross compile)


Mark, Jan,

On 26 February 2014 10:13, Mark Wielaard <mjw@redhat.com> wrote:
> On Wed, 2014-02-26 at 09:18 +0100, Jean Pihet wrote:
>> While at it, I have a concern about the compat mode: profiling an
>> ARMv7 binary on an ARMv8 system.
>> Is this supported by libdw?
>
> My ARM terminology is not that great, but assuming ARMv7 is 32-bit
> (AARCH32?)and ARMv8 is 64-bit (AARCH64), then yes, this should work. The
> libdw interface is "generic". It uses abstract types like Dwarf_Addr and
> Dwarf_Word that are big enough to hold values for either 32 or 64 bit
> setups, and the registers are mapped to an array of Dwarf_Word values.
> The backends handle the actual fetching and manipulation of the register
> values. The backend used is selected through the ELF identifier. You can
> explicitly not link against any backend to make it possible for elfutils
> to evolve the interfaces/backends without breaking user programs.
This is great!

> All this works for i686 and x86_64 in practice, so in theory (not tested
> yet) it should also work for ARMv7 and ARMv8. If you get it working we
> would love to hear it :)
Sure I let you know as soon as some results can be shown on ARMv8.

>
> Cheers,
>
> Mark
>

Thx!

Cheers,
Jean

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