ELF auxiliary vector tags

[Andreas Tobler]

On 12.09.17 00:45, John Baldwin wrote:
> On Monday, September 11, 2017 12:05:02 PM Marcel Moolenaar wrote:
>>
>>> On Sep 8, 2017, at 10:36 AM, John Baldwin <jhb at freebsd.org> wrote:
>>
>>
>>> I know Justin changed time_t to 64-bit on 32-bit powerpc which effectively broke 32-bit powerpc earlier, but this change would break both 32-bit and 64-bit powerpc and is probably more disruptive (in theory some binaries might have worked with a wrong time_t, but renumber AT_STACKPROT, etc. will probably break every binary).
>>
>> That probably depends on the byte order. I would think widening
>> time_t on a big-endian machine is a lot more disruptive than
>> doing it on a little-endian machine.
>>
>> That said and along the lines of what @imp said:
>> Maybe add a a MD macro (e.g. NO_MI_AUX_VECTORS) whose existence
>> suppresses the MI definitions of AT_* so that MD headers can
>> define their own?
> 
> Going forward I would like to standardize on common values for new vectors
> added.  The current implementation of 'info auxv' for GDB assumes they
> are the same on all architectures (and judging by the binutils / gdb bits
> for Linux, Linux uses the same AT_* values on all platforms).  Are you
> running powerpc binaries yourself?  The only person who I know is who has
> replied (Justin) is fine with just pulling the tier-2 card on powerpc to
> bring it inline with all the other platforms (which are already identical).

+1 from my side.

Andreas