From mint-bounce@lists.fishpool.fi Sat Oct 30 23:29:33 2004 X-Original-To: fnaumann@mail.boerde.de Delivered-To: fnaumann@mail.boerde.de Date: Sat, 30 Oct 2004 23:30:14 +0200 From: Patrice Mandin To: Mint list Subject: Re: [MiNT] Shareable/loadable libraries: a preliminary document Message-Id: <20041030233014.0fa3d0eb.mandin.patrice@wanadoo.fr> In-Reply-To: <0322B8A2-2AB7-11D9-91AD-00039357F826@epfl.ch> References: <20041029210939.1d32bc21.mandin.patrice@wanadoo.fr> <693A750D-29E7-11D9-B308-00039357F826@epfl.ch> <20041030211600.422fdada.mandin.patrice@wanadoo.fr> <0322B8A2-2AB7-11D9-91AD-00039357F826@epfl.ch> Organization: Chez moi X-Mailer: Sylpheed version 0.9.11 (GTK+ 1.2.10; i586-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: quoted-printable X-ecartis-version: Ecartis v1.0.0 Sender: mint-bounce@lists.fishpool.fi Errors-To: mint-bounce@lists.fishpool.fi X-original-sender: mandin.patrice@wanadoo.fr Precedence: bulk List-help: List-unsubscribe: List-Id: X-List-ID: X-Virus-Scanned: by amavisd-new at relay.boerde.de X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on relay.boerde.de X-Spam-Status: No, hits=-0.9 tagged_above=-50.5 required=3.8 tests=BAYES_00, RCVD_IN_SORBS X-Spam-Level: Le Sat, 30 Oct 2004 23:02:30 +0200 Philipp Donz=E9 a =E9crit: > > Even if an executable has only one translation table, you know the=20 > > size of the TEXT segment, so you know if you are relocating an address > > in the TEXT or the DATA segment, so you can align the segments on MMU > > pages boundaries. >=20 > But this doesn't work if the compiler generates PC relativ addresses.=20 > E.g. "move.l data(PC), D0" can't work correctly if the assembler does=20 > not know the correct offset to generate. > I must admit, I'm new to GCC. But Pure C makes extensive use of PC=20 > relativ addressing modes. (=3D> this gives smaller and faster code) You're right, I did not think of the case of relative to PC. But I don't know if gcc generate this type of code or not to access the DATA segment. You talk about PureC, but I don't know if creating dynamic linked libraries will be possible with it, so I just stick with binutils+gcc. And on Linux, the segments are aligned on a page boundary to make the TEXT segment read-only, so either it is done: - in the file - no relative to PC when accessing a different segment --=20 Patrice Mandin WWW: http://membres.lycos.fr/pmandin/ Programmeur Linux, Atari Sp=E9cialit=E9: D=E9veloppement, jeux