From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Fri, 3 Apr 2009 17:39:41 +0200 From: Bastian Blank Subject: [RFC][PATCH 0/5] Add and use libgcc Message-ID: <20090403153941.GA7045@wavehammer.waldi.eu.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-Archive: List-Post: To: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org List-ID: Hi gcc always expects to be able to use the symbols in libgcc for operations that are unsupported on the CPU. Linux added functions if needed or just worked around such operations. Sometimes it even describes the compiler as broken, even if it is properly documented by gcc themself. This patchset adds a copy of libgcc to the kernel and uses it if to do such unsupported operations. This way we can remove the usage of workarounds like do_div. Unsolved problems: - It currently uses the gcc-included longlong division support which is marked as possibly trapping. - The libgcc sources are currently unmodifed copies from gcc, this means it needs some headers with fixed names. Bastian -- Leave bigotry in your quarters; there's no room for it on the bridge. -- Kirk, "Balance of Terror", stardate 1709.2