From patchwork Tue Dec 20 06:36:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13077532 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41325C4708D for ; Tue, 20 Dec 2022 07:02:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233364AbiLTHBy (ORCPT ); Tue, 20 Dec 2022 02:01:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53296 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233142AbiLTHBe (ORCPT ); Tue, 20 Dec 2022 02:01:34 -0500 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D799DEE4; Mon, 19 Dec 2022 23:01:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1671519693; x=1703055693; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=o7a+0760MneBwxPKzFiaj9Nq7KFWmVxmzGnbcDhAUFY=; b=DLiKuLaS+NtpbVg2WFWwFmhTDlSJQHLW62FhwMqTvKIidYiWVsPOCa4r CD3YcsCOp3edUNsSjSl8+eONlND7eWBb9mMpNuc2MV957JaVg+Edxeq49 nT+ffZ7LJib2oZFnSn7FvMZNn9+4xmLnK6aO1OmZu1WRlWsln2Pa0OO0H vxuGoGPO22EdT00u4iYoXHRSwKFKjEztL8ykt9Cc/tJPlU90YAWBLBOah 1/YWig30ndsEAUTWVqx2b49d9Il+kTuIhsUvbCO6le90cv18sV/u4V16h yBnYwV/nUK6/3WUK1U00ydQuHAT0AUjFSHFk6VKDf08tRJRXYMs+STcpm g==; X-IronPort-AV: E=McAfee;i="6500,9779,10566"; a="302971959" X-IronPort-AV: E=Sophos;i="5.96,258,1665471600"; d="scan'208";a="302971959" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Dec 2022 23:01:11 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10566"; a="644326440" X-IronPort-AV: E=Sophos;i="5.96,258,1665471600"; d="scan'208";a="644326440" Received: from unknown (HELO fred..) ([172.25.112.68]) by orsmga007.jf.intel.com with ESMTP; 19 Dec 2022 23:01:11 -0800 From: Xin Li To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org, andrew.cooper3@citrix.com, seanjc@google.com, pbonzini@redhat.com, ravi.v.shankar@intel.com Subject: [RFC PATCH 08/32] x86/objtool: teach objtool about ERETU and ERETS Date: Mon, 19 Dec 2022 22:36:34 -0800 Message-Id: <20221220063658.19271-9-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221220063658.19271-1-xin3.li@intel.com> References: <20221220063658.19271-1-xin3.li@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: "H. Peter Anvin (Intel)" Update the objtool decoder to know about the ERETU and ERETS instructions (type INSN_CONTEXT_SWITCH.) Signed-off-by: H. Peter Anvin (Intel) Signed-off-by: Xin Li --- tools/objtool/arch/x86/decode.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c index 1c253b4b7ce0..fbfe0a39599a 100644 --- a/tools/objtool/arch/x86/decode.c +++ b/tools/objtool/arch/x86/decode.c @@ -480,12 +480,22 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec case 0x0f: if (op2 == 0x01) { - - if (modrm == 0xca) - *type = INSN_CLAC; - else if (modrm == 0xcb) - *type = INSN_STAC; - + switch (insn_last_prefix_id(&insn)) { + case INAT_PFX_REPE: + case INAT_PFX_REPNE: + if (modrm == 0xca) { + /* eretu/erets */ + *type = INSN_CONTEXT_SWITCH; + } + break; + default: + if (modrm == 0xca) { + *type = INSN_CLAC; + } else if (modrm == 0xcb) { + *type = INSN_STAC; + } + break; + } } else if (op2 >= 0x80 && op2 <= 0x8f) { *type = INSN_JUMP_CONDITIONAL;