From patchwork Tue Dec 7 13:00:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Weimer X-Patchwork-Id: 48579 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 897D6385842E for ; Tue, 7 Dec 2021 13:02:17 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 897D6385842E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1638882137; bh=XGUFJ4nv27/J3+c6WbZ7tCPs8/wphd3I4tdgk4u8AYY=; h=To:Subject:In-Reply-To:References:Date:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=fAWhbOW/rOMGj3k/qYj5XBtMuY88vmdRE7gOZi1oJyrOjkQR7wBCJYc6u5ov0h03K 34YKMTMC7GBmC9Zvlp+q8Ycfzudt115oxW9b+rd82E+U9/YVf0Q31g53+mH+gn0tLe GFmUBNkA5BNg2iYI1v4yqG3dkyUMmOfmVcR+9B8g= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by sourceware.org (Postfix) with ESMTPS id B69D53858013 for ; Tue, 7 Dec 2021 13:00:45 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org B69D53858013 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-303-MjduGFwZPOO9K6bFLTm40A-1; Tue, 07 Dec 2021 08:00:42 -0500 X-MC-Unique: MjduGFwZPOO9K6bFLTm40A-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 09F7E100CC84 for ; Tue, 7 Dec 2021 13:00:42 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.39.193.123]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5AA645C1D5 for ; Tue, 7 Dec 2021 13:00:41 +0000 (UTC) To: libc-alpha@sourceware.org Subject: [PATCH v2 3/8] nptl: Introduce THREAD_GETMEM_VOLATILE In-Reply-To: References: X-From-Line: 42d7ef3c93f5c7959529c52c620e1e273cd69e83 Mon Sep 17 00:00:00 2001 Message-Id: <42d7ef3c93f5c7959529c52c620e1e273cd69e83.1638880889.git.fweimer@redhat.com> Date: Tue, 07 Dec 2021 14:00:39 +0100 User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-12.5 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) 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: , X-Patchwork-Original-From: Florian Weimer via Libc-alpha From: Florian Weimer Reply-To: Florian Weimer Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" This will be needed for rseq TCB access. Reviewed-by: Szabolcs Nagy --- v2: New patch. sysdeps/i386/nptl/tcb-access.h | 2 ++ sysdeps/nptl/tcb-access.h | 2 ++ sysdeps/x86_64/nptl/tcb-access.h | 2 ++ 3 files changed, 6 insertions(+) diff --git a/sysdeps/i386/nptl/tcb-access.h b/sysdeps/i386/nptl/tcb-access.h index 6c6d561e39..5ddd83224b 100644 --- a/sysdeps/i386/nptl/tcb-access.h +++ b/sysdeps/i386/nptl/tcb-access.h @@ -41,6 +41,8 @@ } \ __value; }) +/* THREAD_GETMEM already forces a read. */ +#define THREAD_GETMEM_VOLATILE(descr, member) THREAD_GETMEM (descr, member) /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ #define THREAD_GETMEM_NC(descr, member, idx) \ diff --git a/sysdeps/nptl/tcb-access.h b/sysdeps/nptl/tcb-access.h index b4137b8ab8..bbe20b7225 100644 --- a/sysdeps/nptl/tcb-access.h +++ b/sysdeps/nptl/tcb-access.h @@ -22,6 +22,8 @@ #define THREAD_GETMEM(descr, member) \ descr->member +#define THREAD_GETMEM_VOLATILE(descr, member) \ + (*(volatile __typeof (descr->member) *)&descr->member) #define THREAD_GETMEM_NC(descr, member, idx) \ descr->member[idx] #define THREAD_SETMEM(descr, member, value) \ diff --git a/sysdeps/x86_64/nptl/tcb-access.h b/sysdeps/x86_64/nptl/tcb-access.h index 18848a729d..e4d2d07a9b 100644 --- a/sysdeps/x86_64/nptl/tcb-access.h +++ b/sysdeps/x86_64/nptl/tcb-access.h @@ -39,6 +39,8 @@ } \ __value; }) +/* THREAD_GETMEM already forces a read. */ +#define THREAD_GETMEM_VOLATILE(descr, member) THREAD_GETMEM (descr, member) /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ # define THREAD_GETMEM_NC(descr, member, idx) \