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Tue, 12 Oct 2021 08:14:58 +0000 Received: from VI1PR04MB5600.eurprd04.prod.outlook.com ([fe80::4d37:ec64:4e90:b16b]) by VI1PR04MB5600.eurprd04.prod.outlook.com ([fe80::4d37:ec64:4e90:b16b%7]) with mapi id 15.20.4587.026; Tue, 12 Oct 2021 08:14:58 +0000 Subject: Re: [PATCH] elf: Support DT_RELR relative relocation format [BZ #27924] To: Joseph Myers , =?UTF-8?B?RsSBbmctcnXDrCBTw7Ju?= =?UTF-8?Q?g?= CC: libc-alpha@sourceware.org, binutils@sourceware.org References: <20211008065740.1485737-1-maskray@google.com> <3368ef30-eb8c-8828-1af0-1a227d99dc93@suse.com> From: Jan Beulich Message-ID: <78d5f838-8c39-c804-c7ee-2c80bab1961b@suse.com> Date: Tue, 12 Oct 2021 10:14:56 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: AS9PR05CA0051.eurprd05.prod.outlook.com (2603:10a6:20b:489::8) To VI1PR04MB5600.eurprd04.prod.outlook.com (2603:10a6:803:e7::16) MIME-Version: 1.0 Received: from [10.156.60.236] (37.24.206.209) by AS9PR05CA0051.eurprd05.prod.outlook.com (2603:10a6:20b:489::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4587.21 via Frontend Transport; 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While this is >>> indeed the case for several arch-es, I think this has been a mistake. >>> IA-64, while meanwhile mostly dead, is (was) an example where 64-bit >>> code can validly live in a 32-bit ELF container (at least as far as >>> the psABI is concerned; I have no idea whether glibc actually >>> followed the spec). There's a separate ELF header flag indicating the >>> ABI, and hence the size of a pointer. >> >> Thanks for chiming in. >> >> As of ia64 buildability, it works for me: >=20 > As far as I know, glibc and the Linux kernel never supported ILP32 on ia6= 4=20 > (HP-UX did). But I'm not entirely clear whether the ILP32 ABI is what's= =20 > being referred to here (cf. x32, MIPS n32, etc. - ILP32 ABIs using 64-bit= =20 > instructions, and 32-bit ELF), or something else. Yes, it's ILP32 that I'm referring to, but specifically not 32-bit ELF to express that (unlike e.g. x32 or Arm64's respective mode). Whether MIPS is comparable I don't know - there are at least a couple of header flags which suggest the ELF container size may be independent of the ABI. Jan