From patchwork Mon Jun 15 14:40:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Earnshaw X-Patchwork-Id: 39609 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id A830F3840C09; Mon, 15 Jun 2020 14:41:30 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by sourceware.org (Postfix) with ESMTP id 1B38E383F85F for ; Mon, 15 Jun 2020 14:41:28 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 1B38E383F85F Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=rearnsha@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BCAD711B3; Mon, 15 Jun 2020 07:41:27 -0700 (PDT) Received: from eagle.buzzard.freeserve.co.uk (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 495323F6CF; Mon, 15 Jun 2020 07:41:27 -0700 (PDT) From: Richard Earnshaw To: libc-alpha@sourceware.org Subject: [PATCH 4/7] linux: Add compatibility definitions to sys/prctl.h for MTE Date: Mon, 15 Jun 2020 15:40:26 +0100 Message-Id: <20200615144029.19771-5-rearnsha@arm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200615144029.19771-1-rearnsha@arm.com> References: <20200615144029.19771-1-rearnsha@arm.com> MIME-Version: 1.0 X-Spam-Status: No, score=-15.6 required=5.0 tests=BAYES_00, GIT_PATCH_0, KAM_DMARC_STATUS, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Earnshaw Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" Older versions of the Linux kernel headers obviously lack support for memory tagging, but we still want to be able to build in support when using those (obviously it can't be enabled on such systems). The linux kernel extensions are made to the platform-independent header (linux/prctl.h), so this patch takes a similar approach. --- sysdeps/unix/sysv/linux/sys/prctl.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/sysdeps/unix/sysv/linux/sys/prctl.h b/sysdeps/unix/sysv/linux/sys/prctl.h index 7f748ebeeb..4d01379c23 100644 --- a/sysdeps/unix/sysv/linux/sys/prctl.h +++ b/sysdeps/unix/sysv/linux/sys/prctl.h @@ -21,6 +21,24 @@ #include #include /* The magic values come from here */ +/* Recent extensions to linux which may post-date the kernel headers + we're picking up... */ + +/* Memory tagging control operations (for AArch64). */ +#ifndef PR_TAGGED_ADDR_ENABLE +# define PR_TAGGED_ADDR_ENABLE (1UL << 8) +#endif + +#ifndef PR_MTE_TCF_SHIFT +# define PR_MTE_TCF_SHIFT 1 +# define PR_MTE_TCF_NONE (0UL << PR_MTE_TCF_SHIFT) +# define PR_MTE_TCF_SYNC (1UL << PR_MTE_TCF_SHIFT) +# define PR_MTE_TCF_ASYNC (2UL << PR_MTE_TCF_SHIFT) +# define PR_MTE_TCF_MASK (3UL << PR_MTE_TCF_SHIFT) +# define PR_MTE_TAG_SHIFT 3 +# define PR_MTE_TAG_MASK (0xffffUL << PR_MTE_TAG_SHIFT) +#endif + __BEGIN_DECLS /* Control process execution. */