From patchwork Fri Sep 24 16:53:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "H.J. Lu" X-Patchwork-Id: 45424 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 4A2BE3858003 for ; Fri, 24 Sep 2021 16:54:11 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4A2BE3858003 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1632502451; bh=OxYfrty98J55AhFUo0CaeDtXAILLgq1yCaqMl57hVRk=; h=To:Subject:Date:List-Id:List-Unsubscribe:List-Archive:List-Post: List-Help:List-Subscribe:From:Reply-To:Cc:From; b=PhF1KtECBh/QfmJPqidgkMsxw44angIpvV4D+6gk0p6ixADwbU8nWaCzW/y6WnLXI 8l+g+Fs41PU1rmCTrF3N12FsxLKhG/Oz/MNBeJDTI7O2Wbl2B+zcNUVzjRy+feLIfW 2llxRANJa/rnXojw6YGZYY/RsztQe4xhyKUN27P8= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-pf1-x431.google.com (mail-pf1-x431.google.com [IPv6:2607:f8b0:4864:20::431]) by sourceware.org (Postfix) with ESMTPS id 4D25B3858C60 for ; Fri, 24 Sep 2021 16:53:49 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 4D25B3858C60 Received: by mail-pf1-x431.google.com with SMTP id 145so9375193pfz.11 for ; Fri, 24 Sep 2021 09:53:49 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=OxYfrty98J55AhFUo0CaeDtXAILLgq1yCaqMl57hVRk=; b=domMfQvmh60pNFgSiAI58jQMhiVGMeV9C3oABegHWfKx73Zsrbn9258yjiiFnsCUNR GCAHzljlqH1ISW+y0Gx56T51Pg+RcftRFiHPxva3MBh1spDDuVjAdhn86zmIuHJ+yvjN OylXTVzF2AWdoRVS3WagT99hFsX9Cq7vRAhOE2m97Z43batwdh3sqviJmm7duQ07i6n+ vIDO8ETEqbHSLQ3bNL48RCa6Ir66afKv6a/r1kh+vKUv0yVcB1VaZlT4EyxhZwhUpYAt fvxEz6ZM3bFRoS0CdFN5gkzd+8xLNh4mAbV8XSo0DEmbnWisfoohzIx/PYDgcsJHHBP5 byeg== X-Gm-Message-State: AOAM530WiUhABaBZD9CZfqL9UCSbMyR0mP2DyM2/x7YOfG8tJQtdxTAk fUFIwMVfeZDAfEWX1cp1Lvil+JL0nkU= X-Google-Smtp-Source: ABdhPJwQ/xcNbYQxSyjYbFgA9lBWx8xNO2yj5Ln9l18ptYiB9wSGyGThF2l+YwKAAMLv4AON+L/+ow== X-Received: by 2002:a63:f84f:: with SMTP id v15mr4647176pgj.204.1632502428388; Fri, 24 Sep 2021 09:53:48 -0700 (PDT) Received: from gnu-gram-1.localdomain (cpe-76-173-15-247.hawaii.res.rr.com. [76.173.15.247]) by smtp.gmail.com with ESMTPSA id y15sm9714400pfq.32.2021.09.24.09.53.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Sep 2021 09:53:48 -0700 (PDT) Received: from gnu-gram-1.localdomain (localhost [IPv6:::1]) by gnu-gram-1.localdomain (Postfix) with ESMTP id 8CC7AE0072; Fri, 24 Sep 2021 09:53:45 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH v7 0/1] RFC: Add Date: Fri, 24 Sep 2021 09:53:37 -0700 Message-Id: <20210924165338.2326917-1-hjl.tools@gmail.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 X-Spam-Status: No, score=-3026.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, 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: "H.J. Lu via Libc-alpha" From: "H.J. Lu" Reply-To: "H.J. Lu" Cc: Florian Weimer , Szabolcs Nagy , Joseph Myers , "Kirill A . Shutemov" Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Changes in v7: 1. Move set_translated_address_mask to libc_nonshared.a. Changes in v6: 1. Update and simplify the API by only exporting: /* Set the mask for address bits used in address translation. Return 0 on success. Return -1 on error. */ extern int set_translated_address_mask (uintptr_t __mask); /* Non-zero if constant address BITS is a valid tagged address bits. */ #define TRANSLATED_ADDRESS_VALID_BITS(BITS) /* A mask for constant address BITS used in address translation. */ #define TRANSLATED_ADDRESS_MASK(BITS) 2. Properly use _Static_assert for C and static_assert for C++. Changes in v5: Add restrictions: 1. All bits between 0 and N - 1, where N is the number of tagged address bits, are used in address translation. 2. All pointers participating in a pointer arithmetic operation should have the same tag if they point to the same memory object so that pointer equality operation can be performed on tagged pointers. Changes in v4: 1. Document that the zero return value from get_tagged_address_bits indicates that tag bits are not the highest bits in address. 2. Document that the zero value of TAGGED_ADDRESS_MASK indicates the invalid address mask. 3. Add to provide TAGGED_ADDRESS_MASK. 4. Add C++ support to TAGGED_ADDRESS_MASK. Changes in v3: 1. set_tagged_address_mask can be only called once before main. 2. Add more tests. --- By default, the number of the address bits used in address translation is the number of address bits. But it can be changed by ARM Top-byte Ignore (TBI) or Intel Linear Address Masking (LAM). provides an API for tagged address manipulation. H.J. Lu (1): : An API for tagged address NEWS | 2 + bits/tagged-address-mask.h | 47 +++++++++++++++++++++ bits/tagged-address-valid-bits.h | 28 +++++++++++++ csu/libc-start.c | 3 ++ elf/dl-support.c | 5 +++ include/sys/tagged-address.h | 19 +++++++++ manual/Makefile | 3 +- manual/ctype.texi | 2 +- manual/memory.texi | 2 +- manual/tagged-address.texi | 48 +++++++++++++++++++++ misc/Makefile | 48 ++++++++++++++++++--- misc/set-translated-address-mask.c | 49 ++++++++++++++++++++++ misc/sys/tagged-address.h | 33 +++++++++++++++ misc/tagged-address.c | 50 ++++++++++++++++++++++ misc/tst-tagged-address-1-static.c | 1 + misc/tst-tagged-address-1.c | 55 +++++++++++++++++++++++++ misc/tst-tagged-address-2-static.c | 1 + misc/tst-tagged-address-2.c | 45 ++++++++++++++++++++ misc/tst-tagged-address-3-static.c | 1 + misc/tst-tagged-address-3.c | 48 +++++++++++++++++++++ misc/tst-tagged-address-4-static.c | 1 + misc/tst-tagged-address-4.c | 36 ++++++++++++++++ misc/tst-tagged-address-5.c | 25 +++++++++++ misc/tst-tagged-address-6.c | 34 +++++++++++++++ misc/tst-tagged-address-7.c | 41 ++++++++++++++++++ misc/tst-tagged-address-mod-5.c | 47 +++++++++++++++++++++ misc/tst-tagged-address-mod-6.c | 34 +++++++++++++++ misc/tst-tagged-address-mod-7.c | 35 ++++++++++++++++ sysdeps/generic/inline-tagged-address.h | 43 +++++++++++++++++++ sysdeps/generic/ldsodefs.h | 4 ++ 30 files changed, 782 insertions(+), 8 deletions(-) create mode 100644 bits/tagged-address-mask.h create mode 100644 bits/tagged-address-valid-bits.h create mode 100644 include/sys/tagged-address.h create mode 100644 manual/tagged-address.texi create mode 100644 misc/set-translated-address-mask.c create mode 100644 misc/sys/tagged-address.h create mode 100644 misc/tagged-address.c create mode 100644 misc/tst-tagged-address-1-static.c create mode 100644 misc/tst-tagged-address-1.c create mode 100644 misc/tst-tagged-address-2-static.c create mode 100644 misc/tst-tagged-address-2.c create mode 100644 misc/tst-tagged-address-3-static.c create mode 100644 misc/tst-tagged-address-3.c create mode 100644 misc/tst-tagged-address-4-static.c create mode 100644 misc/tst-tagged-address-4.c create mode 100644 misc/tst-tagged-address-5.c create mode 100644 misc/tst-tagged-address-6.c create mode 100644 misc/tst-tagged-address-7.c create mode 100644 misc/tst-tagged-address-mod-5.c create mode 100644 misc/tst-tagged-address-mod-6.c create mode 100644 misc/tst-tagged-address-mod-7.c create mode 100644 sysdeps/generic/inline-tagged-address.h