From nobody Tue May 7 10:53:28 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1685715806; cv=none; d=zohomail.com; s=zohoarc; b=RuEvJ8HHAjAR9w334O6XsPDjSdkHLMWza/qsMyEb7Fn5NyhEJyxPhrq9NTJyaLBBkPLIRoAvT4psTMUgRGFgv3EcUFZ4/s1PHcsHsT8LRs52QnDUm2CpLkn95p0YfkWxawDNxWEbT4ETNCV/VXgozhR0tHTfQJisQZ4K2bTOPm0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1685715806; h=Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:To; bh=T5r/LpHJMg7TbmN47HlK1bNQm+yT4WVmfzXQIP2d3t4=; b=Bqrnf4Ylo45hneh2wKM02R0JFE4aiHI5RPSPGFFBQ3+w1tHkPyDiX/25gnyOK0ig4G0pki4xWCk5rd1GB+nqYzMJ1u9ijQ/Rwfg/nj1wMdAkXtELqVBYN353YrT+t82RWIQTvHPFwE2+JE3LYlHyDXbXXlBT2Ph6S0KXPY0Z19w= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1685715806674919.910597470154; Fri, 2 Jun 2023 07:23:26 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1q55fl-0007ZZ-Kr; Fri, 02 Jun 2023 10:22:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q55fc-0007Yb-Bc for qemu-devel@nongnu.org; Fri, 02 Jun 2023 10:22:24 -0400 Received: from mail-wr1-x429.google.com ([2a00:1450:4864:20::429]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1q55fa-0001Xq-LU for qemu-devel@nongnu.org; Fri, 02 Jun 2023 10:22:24 -0400 Received: by mail-wr1-x429.google.com with SMTP id ffacd0b85a97d-3078a3f3b5fso2106076f8f.0 for ; Fri, 02 Jun 2023 07:22:21 -0700 (PDT) Received: from orth.archaic.org.uk (orth.archaic.org.uk. [2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id e21-20020a05600c219500b003f17af4c4e0sm5753600wme.9.2023.06.02.07.22.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Jun 2023 07:22:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1685715740; x=1688307740; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=T5r/LpHJMg7TbmN47HlK1bNQm+yT4WVmfzXQIP2d3t4=; b=rH3c9poL6+VxRMz0zrH9MEbijYE5irYGZvtD3v4zY/cAltbltJBSXGBB2D0sxSFMnf z9chXOb1GuN6KS+RGGQ+KHUBVv8BoYX9kUN9uZZXF+5yFbTF7y50QQAjopiahMJoExgz fE2uTl9hso99Qnv0DuSH6y06bVolrIL91XJ/AgE87cWsiHMZO/UbSrhvyjNdXfpeR+PK T8qgbASecb3vk3ipQgUh0VuW9eN61MkM0JJfuAYqBE+X8RBnIqtFvrxi6JUCl30MVlDE KD060NWpl74bmVBzDHuJtYmv6Yvb0t6hzLEOLE5HWpARL4sKw299ezM1DNUOlJ34LsLJ sr5Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685715740; x=1688307740; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=T5r/LpHJMg7TbmN47HlK1bNQm+yT4WVmfzXQIP2d3t4=; b=cFxcHBYqKn7aiTInzfUAPJDisrT4CbBh3LNxLwZJxUz0iIqCu6D0FUFQv3yc0+PW6T /ehIY+g7aw+uzexF92iLDpnGaN6/JaczGL/rFo02coAunYGt9BKC7voVK9chUdtx6OO2 +bh1PNAHOacXWBigv+YjhJ1vG3Rhj0EXgexkPG6pWfLoCt+kFHMei47nuiopC1pv6qLW 3DVKRlbApKpr6jtT6dwYYd/U9EoLsAOVR9v7sgw8nNQKAfSPlAYJtC34wz5F6YzDUCnP UrNHvVXADjG9sL8b2ibdTCbGmY1fttZ75XywDe/Bgr8pE0pLUAUS8FL8uMOuJiM/3kK7 dH9g== X-Gm-Message-State: AC+VfDwdQ8jJqgELwd7XCIQazm1DYMZ7Hj/lIEtxahiTHx+LyBpxCTVi femgpWNhJOIPPGzBrEcqg8/hVA== X-Google-Smtp-Source: ACHHUZ6K1/cr3k4E4451uBRkaUHXMDQccEnX4NftmJ92cfzMD9Y0nTowdtcAJY1+ySqw0EpiOKQLnA== X-Received: by 2002:adf:f08b:0:b0:309:3a60:d791 with SMTP id n11-20020adff08b000000b003093a60d791mr88693wro.54.1685715740643; Fri, 02 Jun 2023 07:22:20 -0700 (PDT) From: Peter Maydell To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Cc: Richard Henderson , qemu-stable@nongnu.org Subject: [PATCH] target/arm: Fix return value from LDSMIN/LDSMAX 8/16 bit atomics Date: Fri, 2 Jun 2023 15:22:19 +0100 Message-Id: <20230602142219.1999756-1-peter.maydell@linaro.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::429; envelope-from=peter.maydell@linaro.org; helo=mail-wr1-x429.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1685715808518100001 Content-Type: text/plain; charset="utf-8" The atomic memory operations are supposed to return the old memory data value in the destination register. This value is not sign-extended, even if the operation is the signed minimum or maximum. (In the pseudocode for the instructions the returned data value is passed to ZeroExtend() to create the value in the register.) We got this wrong because we were doing a 32-to-64 zero extend on the result for 8 and 16 bit data values, rather than the correct amount of zero extension. Fix the bug by using ext8u and ext16u for the MO_8 and MO_16 data sizes rather than ext32u. Cc: qemu-stable@nongnu.org Signed-off-by: Peter Maydell Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Richard Henderson --- target/arm/tcg/translate-a64.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c index 741a6087399..075553e15f5 100644 --- a/target/arm/tcg/translate-a64.c +++ b/target/arm/tcg/translate-a64.c @@ -3401,8 +3401,22 @@ static void disas_ldst_atomic(DisasContext *s, uint3= 2_t insn, */ fn(tcg_rt, clean_addr, tcg_rs, get_mem_index(s), mop); =20 - if ((mop & MO_SIGN) && size !=3D MO_64) { - tcg_gen_ext32u_i64(tcg_rt, tcg_rt); + if (mop & MO_SIGN) { + switch (size) { + case MO_8: + tcg_gen_ext8u_i64(tcg_rt, tcg_rt); + break; + case MO_16: + tcg_gen_ext16u_i64(tcg_rt, tcg_rt); + break; + case MO_32: + tcg_gen_ext32u_i64(tcg_rt, tcg_rt); + break; + case MO_64: + break; + default: + g_assert_not_reached(); + } } } =20 --=20 2.34.1