From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk1-x732.google.com (mail-qk1-x732.google.com [IPv6:2607:f8b0:4864:20::732]) by sourceware.org (Postfix) with ESMTPS id A26DC3858006 for ; Mon, 18 Jan 2021 20:31:16 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org A26DC3858006 Received: by mail-qk1-x732.google.com with SMTP id b64so19878705qkc.12 for ; Mon, 18 Jan 2021 12:31:16 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=cOvXflfR7evtmHUUxokBTCWeGd0AKtUDCUJUMtgtg4Q=; b=TbQx/UbRkVTVsU4kAoUEj6o8uPpYZXYXYw28RuGuRPMxnpfBPP6siYNz1XU1FEcGIJ Dno7k7H3PyzbQF63PtHDwu0IS9KgiqUHkdD46wFiA6GOPvX5s8mgLZtns3xFOA8E81I5 EkO1M7AtAbaHwBoOO6aNH8BEtWwRJ8nP+qsPGK7IIfblElRzS6cEGF5VsN1c3HZDiD1n RuokMrZ2vCLrMD0IAT9FTpefZ6X3eDTOpQzkKDQxqwllEdw1h8l6nkymzF6ch6WoXb/l FpWHnk4K4doBYGhqqc/GnfFiiK7SPqY2kOVZLYF2Q1+iYNWmNSju2TxRla5Lv0TdotKE E+GA== X-Gm-Message-State: AOAM530kQN5vT43fblGsZ6rsxqQBvFFPRif7y/qkMoTy13Sc4QYEBG5f NcVi7TVxDJ3hCb8GRCK9R4PV6Q== X-Google-Smtp-Source: ABdhPJw/yZMfn6M4t7jtIsdrVC2+dSM3EWBy4zdursvxqjHyttOl+i6uq2Ds6OyE6j9RfQiBiStD5Q== X-Received: by 2002:a05:620a:125b:: with SMTP id a27mr1373702qkl.372.1611001876256; Mon, 18 Jan 2021 12:31:16 -0800 (PST) Received: from [192.168.1.4] ([177.194.48.209]) by smtp.googlemail.com with ESMTPSA id o201sm11611162qke.60.2021.01.18.12.31.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 Jan 2021 12:31:15 -0800 (PST) Subject: Re: Glibc 2.31 - time64 with 64-bit kernel and 32-bit userland To: Florian Weimer , Adhemerval Zanella via Libc-help References: <5FDBA7C2-79E2-4B21-98EF-800694DEB500@technology.de> <87sg6yknoo.fsf@oldenburg.str.redhat.com> From: Adhemerval Zanella Autocrypt: addr=adhemerval.zanella@linaro.org; prefer-encrypt=mutual; keydata= mQINBFcVGkoBEADiQU2x/cBBmAVf5C2d1xgz6zCnlCefbqaflUBw4hB/bEME40QsrVzWZ5Nq 8kxkEczZzAOKkkvv4pRVLlLn/zDtFXhlcvQRJ3yFMGqzBjofucOrmdYkOGo0uCaoJKPT186L NWp53SACXguFJpnw4ODI64ziInzXQs/rUJqrFoVIlrPDmNv/LUv1OVPKz20ETjgfpg8MNwG6 iMizMefCl+RbtXbIEZ3TE/IaDT/jcOirjv96lBKrc/pAL0h/O71Kwbbp43fimW80GhjiaN2y WGByepnkAVP7FyNarhdDpJhoDmUk9yfwNuIuESaCQtfd3vgKKuo6grcKZ8bHy7IXX1XJj2X/ BgRVhVgMHAnDPFIkXtP+SiarkUaLjGzCz7XkUn4XAGDskBNfbizFqYUQCaL2FdbW3DeZqNIa nSzKAZK7Dm9+0VVSRZXP89w71Y7JUV56xL/PlOE+YKKFdEw+gQjQi0e+DZILAtFjJLoCrkEX w4LluMhYX/X8XP6/C3xW0yOZhvHYyn72sV4yJ1uyc/qz3OY32CRy+bwPzAMAkhdwcORA3JPb kPTlimhQqVgvca8m+MQ/JFZ6D+K7QPyvEv7bQ7M+IzFmTkOCwCJ3xqOD6GjX3aphk8Sr0dq3 4Awlf5xFDAG8dn8Uuutb7naGBd/fEv6t8dfkNyzj6yvc4jpVxwARAQABtElBZGhlbWVydmFs IFphbmVsbGEgTmV0dG8gKExpbmFybyBWUE4gS2V5KSA8YWRoZW1lcnZhbC56YW5lbGxhQGxp bmFyby5vcmc+iQI3BBMBCAAhBQJXFRpKAhsDBQsJCAcDBRUKCQgLBRYCAwEAAh4BAheAAAoJ EKqx7BSnlIjv0e8P/1YOYoNkvJ+AJcNUaM5a2SA9oAKjSJ/M/EN4Id5Ow41ZJS4lUA0apSXW NjQg3VeVc2RiHab2LIB4MxdJhaWTuzfLkYnBeoy4u6njYcaoSwf3g9dSsvsl3mhtuzm6aXFH /Qsauav77enJh99tI4T+58rp0EuLhDsQbnBic/ukYNv7sQV8dy9KxA54yLnYUFqH6pfH8Lly sTVAMyi5Fg5O5/hVV+Z0Kpr+ZocC1YFJkTsNLAW5EIYSP9ftniqaVsim7MNmodv/zqK0IyDB GLLH1kjhvb5+6ySGlWbMTomt/or/uvMgulz0bRS+LUyOmlfXDdT+t38VPKBBVwFMarNuREU2 69M3a3jdTfScboDd2ck1u7l+QbaGoHZQ8ZNUrzgObltjohiIsazqkgYDQzXIMrD9H19E+8fw kCNUlXxjEgH/Kg8DlpoYJXSJCX0fjMWfXywL6ZXc2xyG/hbl5hvsLNmqDpLpc1CfKcA0BkK+ k8R57fr91mTCppSwwKJYO9T+8J+o4ho/CJnK/jBy1pWKMYJPvvrpdBCWq3MfzVpXYdahRKHI ypk8m4QlRlbOXWJ3TDd/SKNfSSrWgwRSg7XCjSlR7PNzNFXTULLB34sZhjrN6Q8NQZsZnMNs TX8nlGOVrKolnQPjKCLwCyu8PhllU8OwbSMKskcD1PSkG6h3r0AquQINBFcVGkoBEACgAdbR Ck+fsfOVwT8zowMiL3l9a2DP3Eeak23ifdZG+8Avb/SImpv0UMSbRfnw/N81IWwlbjkjbGTu oT37iZHLRwYUFmA8fZX0wNDNKQUUTjN6XalJmvhdz9l71H3WnE0wneEM5ahu5V1L1utUWTyh VUwzX1lwJeV3vyrNgI1kYOaeuNVvq7npNR6t6XxEpqPsNc6O77I12XELic2+36YibyqlTJIQ V1SZEbIy26AbC2zH9WqaKyGyQnr/IPbTJ2Lv0dM3RaXoVf+CeK7gB2B+w1hZummD21c1Laua +VIMPCUQ+EM8W9EtX+0iJXxI+wsztLT6vltQcm+5Q7tY+HFUucizJkAOAz98YFucwKefbkTp eKvCfCwiM1bGatZEFFKIlvJ2QNMQNiUrqJBlW9nZp/k7pbG3oStOjvawD9ZbP9e0fnlWJIsj 6c7pX354Yi7kxIk/6gREidHLLqEb/otuwt1aoMPg97iUgDV5mlNef77lWE8vxmlY0FBWIXuZ yv0XYxf1WF6dRizwFFbxvUZzIJp3spAao7jLsQj1DbD2s5+S1BW09A0mI/1DjB6EhNN+4bDB SJCOv/ReK3tFJXuj/HbyDrOdoMt8aIFbe7YFLEExHpSk+HgN05Lg5TyTro8oW7TSMTk+8a5M kzaH4UGXTTBDP/g5cfL3RFPl79ubXwARAQABiQIfBBgBCAAJBQJXFRpKAhsMAAoJEKqx7BSn lIjvI/8P/jg0jl4Tbvg3B5kT6PxJOXHYu9OoyaHLcay6Cd+ZrOd1VQQCbOcgLFbf4Yr+rE9l mYsY67AUgq2QKmVVbn9pjvGsEaz8UmfDnz5epUhDxC6yRRvY4hreMXZhPZ1pbMa6A0a/WOSt AgFj5V6Z4dXGTM/lNManr0HjXxbUYv2WfbNt3/07Db9T+GZkpUotC6iknsTA4rJi6u2ls0W9 1UIvW4o01vb4nZRCj4rni0g6eWoQCGoVDk/xFfy7ZliR5B+3Z3EWRJcQskip/QAHjbLa3pml xAZ484fVxgeESOoaeC9TiBIp0NfH8akWOI0HpBCiBD5xaCTvR7ujUWMvhsX2n881r/hNlR9g fcE6q00qHSPAEgGr1bnFv74/1vbKtjeXLCcRKk3Ulw0bY1OoDxWQr86T2fZGJ/HIZuVVBf3+ gaYJF92GXFynHnea14nFFuFgOni0Mi1zDxYH/8yGGBXvo14KWd8JOW0NJPaCDFJkdS5hu0VY 7vJwKcyHJGxsCLU+Et0mryX8qZwqibJIzu7kUJQdQDljbRPDFd/xmGUFCQiQAncSilYOcxNU EMVCXPAQTteqkvA+gNqSaK1NM9tY0eQ4iJpo+aoX8HAcn4sZzt2pfUB9vQMTBJ2d4+m/qO6+ cFTAceXmIoFsN8+gFN3i8Is3u12u8xGudcBPvpoy4OoG Message-ID: Date: Mon, 18 Jan 2021 17:31:12 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <87sg6yknoo.fsf@oldenburg.str.redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-7.8 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_DNSWL_NONE, 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-help@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-help mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Jan 2021 20:31:18 -0000 On 18/01/2021 17:14, Florian Weimer wrote: > * Adhemerval Zanella via Libc-help: > >> This is the expected behavior, running this small example: >> >> -- >> #include >> >> int main (int argc, char *argv[]) >> { >> clock_gettime (CLOCK_REALTIME, &((struct timespec) {})); >> clock_gettime (CLOCK_BOOTTIME, &((struct timespec) {})); >> return 0; >> } >> -- >> >> On a aarch64 kernel without 64-bit compat time_t support (4.12.13), >> this is the generated syscalls: >> >> -- >> clock_gettime64(CLOCK_REALTIME, 0xfffebb58) = -1 ENOSYS (Function not implemented) >> clock_gettime(CLOCK_REALTIME, {tv_sec=1610997887, tv_nsec=516302599}) = 0 >> clock_gettime(CLOCK_BOOTTIME, {tv_sec=2750059, tv_nsec=271773400}) = 0 >> -- >> >> The catch here the 64-bit kernel when running 32-bit userland will >> use compat entrypoints to provide the expected kernel ABI. For kernel >> older than v5.1, it means that even if kernel is 64-bit and support >> 64-bit time_t, the 32-bit syscall entrypoints won't have 64-bit time_t >> support. > > Ugh. Is this for ILP32 support? > > Should we just undefined __NR_clock_gettime64 for 64-bit AArch64? No, this is armhf default binaries. This situation is similar to i686 running on x86_64 kernels. AArch64 (and any other architecture with default 64-bit time_t) will build Linux clock_gettime.c as: int __clock_gettime64 (clockid_t clock_id, struct __timespec64 *tp) { int r; # define __NR_clock_gettime64 __NR_clock_gettime if (true) { r = INLINE_VSYSCALL (clock_gettime64, 2, clock_id, tp); if (r == 0 || errno != ENOSYS) return r; } return r; }