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 Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A8835C3DA7D for ; Wed, 4 Jan 2023 01:56:51 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 46D5A85548; Wed, 4 Jan 2023 02:56:49 +0100 (CET) Authentication-Results: phobos.denx.de; dmarc=none (p=none dis=none) header.from=andestech.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Received: by phobos.denx.de (Postfix, from userid 109) id 08E9E85548; Wed, 4 Jan 2023 02:56:47 +0100 (CET) Received: from Atcsqr.andestech.com (60-248-80-70.hinet-ip.hinet.net [60.248.80.70]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id 51FE985477 for ; Wed, 4 Jan 2023 02:56:44 +0100 (CET) Authentication-Results: phobos.denx.de; dmarc=none (p=none dis=none) header.from=andestech.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=rick@andestech.com Received: from mail.andestech.com (ATCPCS16.andestech.com [10.0.1.222]) by Atcsqr.andestech.com with ESMTP id 3041udqe038597; Wed, 4 Jan 2023 09:56:39 +0800 (+08) (envelope-from rick@andestech.com) Received: from atcfdc88.andestech.com (10.0.15.158) by ATCPCS16.andestech.com (10.0.1.222) with Microsoft SMTP Server id 14.3.498.0; Wed, 4 Jan 2023 09:56:35 +0800 From: Rick Chen To: , , , CC: Subject: [PATCH v3 2/2] riscv: memcpy: check src and dst before copy Date: Wed, 4 Jan 2023 09:56:28 +0800 Message-ID: <20230104015628.29787-1-rick@andestech.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.0.15.158] X-DNSRBL: X-MAIL: Atcsqr.andestech.com 3041udqe038597 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.6 at phobos.denx.de X-Virus-Status: Clean Add src and dst address checking, if they are the same address, just return and don't copy data anymore. Signed-off-by: Rick Chen --- Changes in v3 - new patch: separate from [1/2] --- arch/riscv/lib/memcpy.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/riscv/lib/memcpy.S b/arch/riscv/lib/memcpy.S index 00672c19ad..9884077c93 100644 --- a/arch/riscv/lib/memcpy.S +++ b/arch/riscv/lib/memcpy.S @@ -9,6 +9,7 @@ /* void *memcpy(void *, const void *, size_t) */ ENTRY(__memcpy) WEAK(memcpy) + beq a0, a1, .copy_end /* Save for return value */ mv t6, a0 @@ -121,6 +122,7 @@ WEAK(memcpy) 2: mv a0, t6 +.copy_end: ret .Lmisaligned_word_copy: -- 2.17.1