[PATCH v2] powerpc/64: BE option to use ELFv2 ABI for big endian kernels
mpe at ellerman.id.au
Tue May 4 22:15:34 AEST 2021
Segher Boessenkool <segher at kernel.crashing.org> writes:
> On Mon, May 03, 2021 at 10:51:41AM +1000, Nicholas Piggin wrote:
>> Excerpts from Segher Boessenkool's message of May 3, 2021 3:55 am:
>> > On Wed, Apr 29, 2020 at 10:57:16AM +1000, Nicholas Piggin wrote:
>> >> Excerpts from Segher Boessenkool's message of April 29, 2020 9:40 am:
>> >> I blame toolchain for -mabi=elfv2 ! And also some blame on ABI document
>> >> which is called ELF V2 ABI rather than ELF ABI V2 which would have been
>> >> unambiguous.
>> > At least ELFv2 ABI is correct. "ELF ABI v2" is not.
>> >> I can go through and change all my stuff and config options to ELF_ABI_v2.
>> > Please don't. It is wrong.
>> Then I'm not sure what the point of your previous mail was, what did I
> I asked if you could make it clearer to people who do not know what this
> is whether they want to use it. Or that was my intention, anyhow :-/
>> > Both the original PowerPC ELF ABI and the
>> > ELFv2 one have versions themselves. Also, the base ELF standard has a
>> > version, and is set up so there can be incompatible versions even! Of
>> > course it still is version 1 to this day, but :-)
>> The point was for people who don't know ELFv2 has a specific meaning for
> It does not have *any* meaning outside of Power. But people who do not
> know what it is can assume the wrong things about it. It isn't a great
> name because of that :-(
> (It's not as bad as the MIPS ABIs -- an older one is called "new" :-) )
>> then ELF ABIv2 is more explanatory about it being an abi change
>> rather than base elf change, even if it's not the "correct" name.
> I very much disagree. "ELF ABIv2" is completely meaningless.
$ readelf -h /bin/true
Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: DYN (Shared object file)
Entry point address: 0x1990
Start of program headers: 64 (bytes into file)
Start of section headers: 66176 (bytes into file)
Flags: 0x2, abiv2
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