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 C80F1C43387 for ; Wed, 26 Dec 2018 23:22:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8C27F218A5 for ; Wed, 26 Dec 2018 23:22:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1545866526; bh=iWXAqQLaG+6hGfoIPo6i9JFqcOvF97kQu5MvsDI2Bqw=; h=From:To:Cc:Subject:Date:List-ID:From; b=nfhxriGGiLOY8aPDgobP8BHmhS1JExae0ReGNX0mgv6e1qFUMLOLiZo5yHHRr1yX2 Jpvveuk+HVG4Yiyjp4++M64AiOC1Bk8zO10rpIUEFHy9RavX3ykMMzzCBOwwwjIZff KsMiOHZXz3/AXjgrOzsrkXH5Lvd/jgRV9I7lDYFQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727548AbeLZXWF (ORCPT ); Wed, 26 Dec 2018 18:22:05 -0500 Received: from mail.kernel.org ([198.145.29.99]:43742 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726138AbeLZXWF (ORCPT ); Wed, 26 Dec 2018 18:22:05 -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 A9E2C2084A; Wed, 26 Dec 2018 23:22:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1545866524; bh=iWXAqQLaG+6hGfoIPo6i9JFqcOvF97kQu5MvsDI2Bqw=; h=From:To:Cc:Subject:Date:From; b=Z4nDZRYPDxCNW6SX21GG1jR1432qwKaC5civM88HGE0Vm+YpJXIDvn6SB3vweUXvv J0Fd9S2O+DiUDs8qcOsSNZlULlTqweYs7/lhinnuMU34ZM0jOZkCMJWvf0tcXtmyeR jgonqV2/zZ8JbLWchn6ZtX5NYBMQX574eTY571V4= 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 3.18 01/12] powerpc: Fix COFF zImage booting on old powermacs Date: Wed, 26 Dec 2018 17:57:29 -0500 Message-Id: <20181226225741.151608-1-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 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 8539ac93b0de..dbb06588b594 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