V2 [PATCH] x86: Support GNU_PROPERTY_X86_ISA_1_V[234] marker:

[Florian Weimer]

* H. J. Lu:

> On Tue, Oct 13, 2020 at 4:29 AM Florian Weimer <fweimer@redhat.com> wrote:
>>
>> * H. J. Lu:
>>
>> > On Tue, Oct 13, 2020 at 3:48 AM Florian Weimer <fweimer@redhat.com> wrote:
>> >>
>> >> * H. J. Lu via Binutils:
>> >>
>> >> > Here is the updated patch with -z x86-64-v[234] linker command line
>> >> > option to mark x86-64-v[234] ISA level as needed.
>> >>
>> >> I think this needs a marker for the baseline as well.  Currently, a
>> >> missing marker can either mean “the programmer did not specify a marker”
>> >> or “the object uses the baseline ABI”.
>> >>
>> >
>> > “the object uses the baseline ABI” and “the programmer did not specify
>> > a marker” mean the same thing to ld.so since a baseline or
>> > x86-64-v[234] objects may contain ANY instructions.
>>
>> ld.so won't be the sole consumer of such annotations.  For example, an
>> install-like tool could use the annotations to select the appropriate
>> installation path for an ELF shared object.
>>
>
> They should treat “the object uses the baseline ABI” the same way as
> “the programmer did not specify a marker” since the ISA marker specifies
> the minimum ISA level, not the maximum.

I don't think this will work for us in our downstream binary analysis,
sorry.  Please add a marker for the baseline ABI.  Thanks.

Florian
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