Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753102AbbBSA0C (ORCPT ); Wed, 18 Feb 2015 19:26:02 -0500 Received: from terminus.zytor.com ([198.137.202.10]:47565 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753028AbbBSAZ6 (ORCPT ); Wed, 18 Feb 2015 19:25:58 -0500 Date: Wed, 18 Feb 2015 16:25:39 -0800 From: tip-bot for Denys Vlasenko Message-ID: Cc: linux-kernel@vger.kernel.org, ananth@in.ibm.com, srikar@linux.vnet.ibm.com, tglx@linutronix.de, fche@redhat.com, oleg@redhat.com, masami.hiramatsu.pt@hitachi.com, hpa@zytor.com, jkenisto@linux.vnet.ibm.com, mingo@kernel.org, dvlasenk@redhat.com Reply-To: linux-kernel@vger.kernel.org, ananth@in.ibm.com, tglx@linutronix.de, srikar@linux.vnet.ibm.com, fche@redhat.com, oleg@redhat.com, masami.hiramatsu.pt@hitachi.com, mingo@kernel.org, hpa@zytor.com, jkenisto@linux.vnet.ibm.com, dvlasenk@redhat.com In-Reply-To: <1423767879-31691-1-git-send-email-dvlasenk@redhat.com> References: <1423767879-31691-1-git-send-email-dvlasenk@redhat.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/asm] x86/asm/decoder: Create artificial 3rd byte for 2-byte VEX Git-Commit-ID: 8a764a875fe3cf3a83296bacd00bfc41917e95e2 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2066 Lines: 56 Commit-ID: 8a764a875fe3cf3a83296bacd00bfc41917e95e2 Gitweb: http://git.kernel.org/tip/8a764a875fe3cf3a83296bacd00bfc41917e95e2 Author: Denys Vlasenko AuthorDate: Thu, 12 Feb 2015 20:04:39 +0100 Committer: Ingo Molnar CommitDate: Wed, 18 Feb 2015 21:01:50 +0100 x86/asm/decoder: Create artificial 3rd byte for 2-byte VEX Before this patch, users need to do this to fetch vex.vvvv: if (insn->vex_prefix.nbytes == 2) { vex_vvvv = ((insn->vex_prefix.bytes[1] >> 3) & 0xf) ^ 0xf; } if (insn->vex_prefix.nbytes == 3) { vex_vvvv = ((insn->vex_prefix.bytes[2] >> 3) & 0xf) ^ 0xf; } Make it so that insn->vex_prefix.bytes[2] always contains vex.wvvvvLpp bits. Signed-off-by: Denys Vlasenko Acked-by: Masami Hiramatsu Cc: Ananth N Mavinakayanahalli Cc: Frank Ch. Eigler Cc: Jim Keniston Cc: Oleg Nesterov Cc: Srikar Dronamraju Link: http://lkml.kernel.org/r/1423767879-31691-1-git-send-email-dvlasenk@redhat.com Signed-off-by: Ingo Molnar --- arch/x86/lib/insn.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/lib/insn.c b/arch/x86/lib/insn.c index 1313ae6..5ea00dd 100644 --- a/arch/x86/lib/insn.c +++ b/arch/x86/lib/insn.c @@ -164,6 +164,12 @@ found: /* VEX.W overrides opnd_size */ insn->opnd_bytes = 8; } else { + /* + * For VEX2, fake VEX3-like byte#2. + * Makes it easier to decode vex.W, vex.vvvv, + * vex.L and vex.pp. Masking with 0x7f sets vex.W == 0. + */ + insn->vex_prefix.bytes[2] = b2 & 0x7f; insn->vex_prefix.nbytes = 2; insn->next_byte += 2; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/