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Re: [PATCH] x32: Set GLRO(dl_platform) to "x86_64" by default [BZ #22363]
On Mon, Oct 30, 2017 at 9:28 AM, Andreas Schwab <schwab@linux-m68k.org> wrote:
> On Okt 30 2017, "H.J. Lu" <hjl.tools@gmail.com> wrote:
>
>> On Mon, Oct 30, 2017 at 12:05 AM, Andreas Schwab <schwab@linux-m68k.org> wrote:
>>> On Okt 29 2017, "H.J. Lu" <hjl.tools@gmail.com> wrote:
>>>
>>>> Set dl_platform to "x86_64" for x32 by default since kernel may set it
>>>> to "i686".
>>>
>>> Why does it do that? Isn't that a kernel bug?
>>>
>>
>> There is
>>
>> include/asm/elf.h:#define COMPAT_ELF_PLATFORM ("i686")
>>
>> It is much simpler to fix it in glibc.
>
> Take a look how this is solved for aarch64 ILP32.
>
I saw
#define ELF_PLATFORM ("aarch64_be")
#define ELF_PLATFORM ("aarch64")
#define COMPAT_ELF_PLATFORM ("v8b")
#define COMPAT_ELF_PLATFORM ("v8l")
on staging/ilp32-4.13 branch.
I assume v8l/v8b will be used as AT_PLATFORM for both ILP32 and
arm32 programs. I don't see how this approach can work for i686
and x32.
--
H.J.