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=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS 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 AFEEFC433E0 for ; Mon, 6 Jul 2020 16:55:06 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 78B96206E9 for ; Mon, 6 Jul 2020 16:55:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Rk3ykQQi" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 78B96206E9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:56428 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jsUOX-0005qO-Kh for qemu-devel@archiver.kernel.org; Mon, 06 Jul 2020 12:55:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57112) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jsUCM-0003fA-EW for qemu-devel@nongnu.org; Mon, 06 Jul 2020 12:42:30 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:41702 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jsUCI-00037u-2z for qemu-devel@nongnu.org; Mon, 06 Jul 2020 12:42:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1594053745; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Mo/vHzn13bWMwYHSzkNfUXN+2hSv+iJGMj9zWWsqq4Q=; b=Rk3ykQQiCs7Nc0Viy9zfOCiBmR93W3VPEZMN0RC/UqYJfkiFIhkhOlxFV62ner+QFcSwi7 3scTwht1a6fuxs8GvSSAJIZPpQYzB8KJ3ScbI7Wi0FZnbc6tQiP30T/XsoYYV5oX9EM2Dc pwuSFLJbc2zlCaFpeQk3NECouq2bF6I= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-313-MzlNeYKAPa-45Iso1TdWBw-1; Mon, 06 Jul 2020 12:42:23 -0400 X-MC-Unique: MzlNeYKAPa-45Iso1TdWBw-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D81E81937FDD; Mon, 6 Jul 2020 16:42:22 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 75CDD5F7D8; Mon, 6 Jul 2020 16:42:22 +0000 (UTC) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 30/53] target/i386: implement undocumented "smsw r32" behavior Date: Mon, 6 Jul 2020 12:41:32 -0400 Message-Id: <20200706164155.24696-31-pbonzini@redhat.com> In-Reply-To: <20200706164155.24696-1-pbonzini@redhat.com> References: <20200706164155.24696-1-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=207.211.31.81; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/06 01:39:15 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Roman Bolshakov , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" In 32-bit mode, the higher 16 bits of the destination register are undefined. In practice CR0[31:0] is stored, just like in 64-bit mode, so just remove the "if" that currently differentiates the behavior. Reviewed-by: Richard Henderson Reported-by: Roman Bolshakov Reviewed-by: Roman Bolshakov Signed-off-by: Paolo Bonzini --- target/i386/translate.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/target/i386/translate.c b/target/i386/translate.c index 5ef72ff401..a1d31f09c1 100644 --- a/target/i386/translate.c +++ b/target/i386/translate.c @@ -7579,12 +7579,13 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu) CASE_MODRM_OP(4): /* smsw */ gen_svm_check_intercept(s, pc_start, SVM_EXIT_READ_CR0); tcg_gen_ld_tl(s->T0, cpu_env, offsetof(CPUX86State, cr[0])); - if (CODE64(s)) { - mod = (modrm >> 6) & 3; - ot = (mod != 3 ? MO_16 : s->dflag); - } else { - ot = MO_16; - } + /* + * In 32-bit mode, the higher 16 bits of the destination + * register are undefined. In practice CR0[31:0] is stored + * just like in 64-bit mode. + */ + mod = (modrm >> 6) & 3; + ot = (mod != 3 ? MO_16 : s->dflag); gen_ldst_modrm(env, s, modrm, ot, OR_TMP0, 1); break; case 0xee: /* rdpkru */ -- 2.26.2