From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 22541 invoked by alias); 2 May 2008 22:29:38 -0000 Received: (qmail 22531 invoked by uid 22791); 2 May 2008 22:29:37 -0000 X-Spam-Check-By: sourceware.org Received: from mtagate2.de.ibm.com (HELO mtagate2.de.ibm.com) (195.212.29.151) by sourceware.org (qpsmtpd/0.31) with ESMTP; Fri, 02 May 2008 22:29:15 +0000 Received: from d12nrmr1607.megacenter.de.ibm.com (d12nrmr1607.megacenter.de.ibm.com [9.149.167.49]) by mtagate2.de.ibm.com (8.13.8/8.13.8) with ESMTP id m42MT5KV167812 for ; Fri, 2 May 2008 22:29:05 GMT Received: from d12av02.megacenter.de.ibm.com (d12av02.megacenter.de.ibm.com [9.149.165.228]) by d12nrmr1607.megacenter.de.ibm.com (8.13.8/8.13.8/NCO v8.7) with ESMTP id m42MT4cC4116666 for ; Sat, 3 May 2008 00:29:04 +0200 Received: from d12av02.megacenter.de.ibm.com (loopback [127.0.0.1]) by d12av02.megacenter.de.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id m42MT4MV020319 for ; Sat, 3 May 2008 00:29:04 +0200 Received: from tuxmaker.boeblingen.de.ibm.com (tuxmaker.boeblingen.de.ibm.com [9.152.85.9]) by d12av02.megacenter.de.ibm.com (8.12.11.20060308/8.12.11) with SMTP id m42MT4UQ020315; Sat, 3 May 2008 00:29:04 +0200 Message-Id: <200805022229.m42MT4UQ020315@d12av02.megacenter.de.ibm.com> Received: by tuxmaker.boeblingen.de.ibm.com (sSMTP sendmail emulation); Sat, 3 May 2008 00:29:04 +0200 Subject: Re: Shared library call problems on PowerPC with current binutils/gdb To: drow@false.org (Daniel Jacobowitz) Date: Fri, 02 May 2008 23:25:00 -0000 From: "Ulrich Weigand" Cc: gdb-patches@sourceware.org, bauerman@br.ibm.com, amodra@bigpond.net.au In-Reply-To: <20080502215132.GA12244@caradoc.them.org> from "Daniel Jacobowitz" at May 02, 2008 05:51:32 PM X-Mailer: ELM [version 2.5 PL2] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org X-SW-Source: 2008-05/txt/msg00118.txt.bz2 Daniel Jacobowitz wrote: > This appears to work consistently, where by work I mean disassembly > shows the @plt sym but breakpoints on the undecorated version work > fine. I'm not sure exactly why; it may be luck. If it's luck > and someone cares later, we could make it work reliably by making > sure the @plt version has an accurate size and the non-@plt version > has size 0, or by making lookup_minimal_symbol_by_pc_section > explicitly prefer text to non-text symbols. > > Hmm, thinking about this more, it probably won't work for your > case after all. lookup_solib_trampoline_symbol_by_pc will return > NULL if the first symbol we find is the text version. If we have two symbols, *both* need to be mst_solib_trampoline. As an alternative to having two symbols, I'm wondering if there is a way to have just one symbol with differing SYMBOL_PRINT_NAME (with @plt) and SYMBOL_SEARCH_NAME (without @plt). The same might also be nice for versioned symbols. I've also been thinking about the same approach to show PowerPC64 'dot' symbols without the dot when printing them ... Bye, Ulrich -- Dr. Ulrich Weigand GNU Toolchain for Linux on System z and Cell BE Ulrich.Weigand@de.ibm.com