From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9E8F5C433ED for ; Tue, 4 May 2021 12:16:07 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C8331613AA for ; Tue, 4 May 2021 12:16:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C8331613AA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4FZJj10vTmz30BN for ; Tue, 4 May 2021 22:16:05 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=aRGdb6rm; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=ellerman.id.au (client-ip=203.11.71.1; helo=ozlabs.org; envelope-from=mpe@ellerman.id.au; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=aRGdb6rm; dkim-atps=neutral Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4FZJhW2xFJz2xYf for ; Tue, 4 May 2021 22:15:38 +1000 (AEST) Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4FZJhS5Lf8z9sV5; Tue, 4 May 2021 22:15:36 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ellerman.id.au; s=201909; t=1620130537; bh=uWtdbCI0TNtx0mLD+ufT/ZYFqrfLvco2t5eCGabi+Ls=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=aRGdb6rmJlqeBhjJKYH/xQUBheRefJmDz05mp58PuIFHnZnuxYRRf0bOWdHo6E3M5 +60MYoaIT0QIaZY7EoY/bny2HpzGJduKMIQcdn0+boa52Z1+R81WgJ93rwKQ2E0KWk /62tgRVq4igx6Jms/XM/RPxuqD/lrizECAreQq3QN7Sk3kVC3e5nulNjxLlaWfHg8G GeoQeT3JieqtLqR2CQgEvDwPUwAgyUL52Ilil6LrfNUrRBbGcIQ8eDAax8JMDlK/za Pv/5nkdUCBXhyY5uGg1K6LbcBmtNTTDfWAlIiUMmA0MyLoIyOXWqjETVx8L0xAKs4B 6kBz3C8iJTRXg== From: Michael Ellerman To: Segher Boessenkool , Nicholas Piggin Subject: Re: [PATCH v2] powerpc/64: BE option to use ELFv2 ABI for big endian kernels In-Reply-To: <20210503151824.GJ10366@gate.crashing.org> References: <20200428112517.1402927-1-npiggin@gmail.com> <20200428234046.GP17645@gate.crashing.org> <1588121596.7zej1imag0.astroid@bobo.none> <20210502175506.GE10366@gate.crashing.org> <1620002801.0iaahdk9xn.astroid@bobo.none> <20210503151824.GJ10366@gate.crashing.org> Date: Tue, 04 May 2021 22:15:34 +1000 Message-ID: <875yzyae55.fsf@mpe.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Segher Boessenkool 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 >> miss? > > 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 >> powerpc, > > 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. Except: $ readelf -h /bin/true ELF Header: Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 Class: ELF64 Data: 2's complement, little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: DYN (Shared object file) Machine: PowerPC64 Version: 0x1 Entry point address: 0x1990 Start of program headers: 64 (bytes into file) Start of section headers: 66176 (bytes into file) Flags: 0x2, abiv2 ^^^^^ :) cheers