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=-9.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 74F9EC43387 for ; Wed, 26 Dec 2018 22:53:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 433E2218A5 for ; Wed, 26 Dec 2018 22:53:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1545864835; bh=3Czy2PjlnymjrRkOxlN2tJetQsILPFtz8qPZkKjnUH8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Po1zoBva8fi1fe7YVEwQOTBJniPB8KYJJeiz6+hQSQomqyH9LYC3TpeurbBNIT36P a5RmzQUBjBrueTn5j4DUb0kAe0kXe3SUvMqFSFW0nXwAfEvuEZsBWv2KGsY/rZTy3L d9eVIWvlxzna3d1xt+xPEhTHBpoEV6u71Bvyre/U= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729930AbeLZWxy (ORCPT ); Wed, 26 Dec 2018 17:53:54 -0500 Received: from mail.kernel.org ([198.145.29.99]:55196 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728063AbeLZWxw (ORCPT ); Wed, 26 Dec 2018 17:53:52 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D184C218A5; Wed, 26 Dec 2018 22:53:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1545864831; bh=3Czy2PjlnymjrRkOxlN2tJetQsILPFtz8qPZkKjnUH8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=r5Lk2v8n4KsYhiVI59YGewG8LtwCVSeEEvOAXPoFs8QTzr6/Bcd4J6LN4ALR7qNji mCls/cIVwJ1mkWRkcxT2KGZobM29DxGCnfB+qeUXuJvVSKlRhv7ZOt6kDIxSl4LIFL KioYgIPvy5SxXS6gUBxxsTc5yH85Angx0nfT+/G8= From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Paul Mackerras , Michael Ellerman , Sasha Levin , linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 4.9 02/35] powerpc: Fix COFF zImage booting on old powermacs Date: Wed, 26 Dec 2018 17:41:09 -0500 Message-Id: <20181226224142.150866-2-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181226224142.150866-1-sashal@kernel.org> References: <20181226224142.150866-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Paul Mackerras [ Upstream commit 5564597d51c8ff5b88d95c76255e18b13b760879 ] Commit 6975a783d7b4 ("powerpc/boot: Allow building the zImage wrapper as a relocatable ET_DYN", 2011-04-12) changed the procedure descriptor at the start of crt0.S to have a hard-coded start address of 0x500000 rather than a reference to _zimage_start, presumably because having a reference to a symbol introduced a relocation which is awkward to handle in a position-independent executable. Unfortunately, what is at 0x500000 in the COFF image is not the first instruction, but the procedure descriptor itself, that is, a word containing 0x500000, which is not a valid instruction. Hence, booting a COFF zImage results in a "DEFAULT CATCH!, code=FFF00700" message from Open Firmware. This fixes the problem by (a) putting the procedure descriptor in the data section and (b) adding a branch to _zimage_start as the first instruction in the program. Fixes: 6975a783d7b4 ("powerpc/boot: Allow building the zImage wrapper as a relocatable ET_DYN") Signed-off-by: Paul Mackerras Signed-off-by: Michael Ellerman Signed-off-by: Sasha Levin --- arch/powerpc/boot/crt0.S | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/boot/crt0.S b/arch/powerpc/boot/crt0.S index 5c2199857aa8..a3550e8f1a77 100644 --- a/arch/powerpc/boot/crt0.S +++ b/arch/powerpc/boot/crt0.S @@ -15,7 +15,7 @@ RELA = 7 RELACOUNT = 0x6ffffff9 - .text + .data /* A procedure descriptor used when booting this as a COFF file. * When making COFF, this comes first in the link and we're * linked at 0x500000. @@ -23,6 +23,8 @@ RELACOUNT = 0x6ffffff9 .globl _zimage_start_opd _zimage_start_opd: .long 0x500000, 0, 0, 0 + .text + b _zimage_start #ifdef __powerpc64__ .balign 8 -- 2.19.1