From patchwork Mon Jul 22 21:39:24 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julien Grall X-Patchwork-Id: 11053519 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C29A41398 for ; Mon, 22 Jul 2019 21:41:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B015B2847E for ; Mon, 22 Jul 2019 21:41:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A3BC828514; Mon, 22 Jul 2019 21:41:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 573BD2847E for ; Mon, 22 Jul 2019 21:41:50 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hpg2T-0002Q3-ED; Mon, 22 Jul 2019 21:40:09 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hpg2R-0002MX-V8 for xen-devel@lists.xenproject.org; Mon, 22 Jul 2019 21:40:07 +0000 X-Inumbo-ID: 45b43da2-acc9-11e9-8980-bc764e045a96 Received: from foss.arm.com (unknown [217.140.110.172]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTP id 45b43da2-acc9-11e9-8980-bc764e045a96; Mon, 22 Jul 2019 21:40:06 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9C54D1509; Mon, 22 Jul 2019 14:40:06 -0700 (PDT) Received: from e108454-lin.cambridge.arm.com (e108454-lin.cambridge.arm.com [10.1.196.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E87433F71F; Mon, 22 Jul 2019 14:40:05 -0700 (PDT) From: Julien Grall To: xen-devel@lists.xenproject.org Date: Mon, 22 Jul 2019 22:39:24 +0100 Message-Id: <20190722213958.5761-2-julien.grall@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190722213958.5761-1-julien.grall@arm.com> References: <20190722213958.5761-1-julien.grall@arm.com> Subject: [Xen-devel] [PATCH v2 01/35] xen/arm64: macros: Introduce an assembly macro to alias x30 X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Julien Grall , Stefano Stabellini , Volodymyr Babchuk MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP The return address of a function is always stored in x30. For convenience, introduce a register alias so "lr" can be used in assembly. This is defined in asm-arm/arm64/macros.h to allow all assembly files to use it. Signed-off-by: Julien Grall Reviewed-by: Volodymyr Babchuk Reviewed-by: Stefano Stabellini --- Changes in v2: - Patch added --- xen/arch/arm/arm64/entry.S | 5 ----- xen/include/asm-arm/arm64/macros.h | 5 +++++ 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/xen/arch/arm/arm64/entry.S b/xen/arch/arm/arm64/entry.S index 97b05f53ea..2d9a2713a1 100644 --- a/xen/arch/arm/arm64/entry.S +++ b/xen/arch/arm/arm64/entry.S @@ -7,11 +7,6 @@ #include /* - * Register aliases. - */ -lr .req x30 /* link register */ - -/* * Stack pushing/popping (register pairs only). Equivalent to store decrement * before, load increment after. */ diff --git a/xen/include/asm-arm/arm64/macros.h b/xen/include/asm-arm/arm64/macros.h index 9c5e676b37..f981b4f43e 100644 --- a/xen/include/asm-arm/arm64/macros.h +++ b/xen/include/asm-arm/arm64/macros.h @@ -21,5 +21,10 @@ ldr \dst, [\dst, \tmp] .endm +/* + * Register aliases. + */ +lr .req x30 /* link register */ + #endif /* __ASM_ARM_ARM64_MACROS_H */