From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 27102 invoked by alias); 15 Sep 2010 08:33:56 -0000 Received: (qmail 27092 invoked by uid 22791); 15 Sep 2010 08:33:55 -0000 X-SWARE-Spam-Status: No, hits=-1.9 required=5.0 tests=AWL,BAYES_00,TW_BJ X-Spam-Check-By: sourceware.org Received: from mel.act-europe.fr (HELO mel.act-europe.fr) (212.99.106.210) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 15 Sep 2010 08:33:50 +0000 Received: from localhost (localhost [127.0.0.1]) by filtered-smtp.eu.adacore.com (Postfix) with ESMTP id 24539CB020C; Wed, 15 Sep 2010 10:33:48 +0200 (CEST) Received: from mel.act-europe.fr ([127.0.0.1]) by localhost (smtp.eu.adacore.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6GOZAjp0cb1G; Wed, 15 Sep 2010 10:33:48 +0200 (CEST) Received: from ulanbator.act-europe.fr (ulanbator.act-europe.fr [10.10.1.67]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mel.act-europe.fr (Postfix) with ESMTP id 107DFCB01DB; Wed, 15 Sep 2010 10:33:48 +0200 (CEST) Subject: Re: [RFC] Improve stabs debugging for mingw64 executables loaded at high addresses Mime-Version: 1.0 (Apple Message framework v1081) Content-Type: text/plain; charset=us-ascii From: Tristan Gingold In-Reply-To: <001401cb54af$6d2e6c40$478b44c0$@muller@ics-cnrs.unistra.fr> Date: Wed, 15 Sep 2010 12:42:00 -0000 Cc: Content-Transfer-Encoding: 7bit Message-Id: <099BB3FE-1E25-4A56-8ABE-D234B360862F@adacore.com> References: <000701cb541e$1160cde0$342269a0$@muller@ics-cnrs.unistra.fr> <282E4D5B-2863-4CC2-99EE-76A36BDE8A9F@adacore.com> <000a01cb5420$e7a44420$b6eccc60$@muller@ics-cnrs.unistra.fr> <9B2E419A-9C35-40DD-8979-B19C4FD69BD4@adacore.com> <001401cb54af$6d2e6c40$478b44c0$@muller@ics-cnrs.unistra.fr> To: Pierre Muller X-IsSubscribed: yes 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: 2010-09/txt/msg00286.txt.bz2 On Sep 15, 2010, at 10:24 AM, Pierre Muller wrote: > This is not in GNU binutils then, because > bfd/stabs.c still has a macro called STABSIZE equal to 12 > which only allows for a 4-byte address at offset 8 for stab value field. > There is a FIXME at line 39: > "FIXME: This will have to change for a 64-bit object format." bfd/stabs.c is only for linking. > But nothing changed in code apparently. > Where is the source of the support for 64-bit stabs for darwin64? bfd/mach-o.c:bfd_mach_o_read_symtab_symbol and gdb/machoread.c:macho_symtab_read (this doesn't use dbxread.c) >> OTOH, dbxread.c seems to be bound to 32-bits stabs address. > > Which seems logical as also bfd only supports 32-bit, > I would be interested in extending support for 64-bit > stabs (which I would then implement inside Free Pascal too). > >> I am not sure it is right to set objfile->section_offsets->offsets. > > I am not either, that why this is really only a > Request For Comments! > >>> The thing is that, for Free Pascal, we have lots of >>> troubles with DWARF (and some 64-bit specific), >>> thus I would like to be able to use STABS format (which >>> is less troublesome) but that also didn't work >>> because of this high address default base used by this compiler. >> >> So, it might be worth fixing Free Pascal too ! > I could change the default load address inside Free Pascal Source > if stabs is used, but I wanted to try this out, > and as it seemed to help, I wanted to share it as a RFC. > > But this addition would allow to handle dynamic libraries > (whose load address might be above the 0x100000000 threshold). > But I remember that for windows at least, there is an > incompatibility between relocation and stabs. > > Pierre > >