From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 28799 invoked by alias); 30 Nov 2001 20:45:50 -0000 Mailing-List: contact gdb-help@sourceware.cygnus.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sources.redhat.com Received: (qmail 28246 invoked from network); 30 Nov 2001 20:44:33 -0000 Received: from unknown (HELO nevyn.them.org) (128.2.145.6) by hostedprojects.ges.redhat.com with SMTP; 30 Nov 2001 20:44:33 -0000 Received: from drow by nevyn.them.org with local (Exim 3.32 #1 (Debian)) id 169uWp-0007KN-00; Fri, 30 Nov 2001 15:44:59 -0500 Date: Sun, 25 Nov 2001 12:41:00 -0000 From: Daniel Jacobowitz To: Paul Mundt Cc: gdb@sourceware.cygnus.com Subject: Re: mips64 elf64 problems Message-ID: <20011130154459.A27914@nevyn.them.org> Mail-Followup-To: Paul Mundt , gdb@sourceware.cygnus.com References: <20011130113108.A7288@mvista.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20011130113108.A7288@mvista.com> User-Agent: Mutt/1.3.23i X-SW-Source: 2001-11/txt/msg00247.txt.bz2 On Fri, Nov 30, 2001 at 11:31:08AM -0800, Paul Mundt wrote: > I was in the process of testing out kgdb with a mips64 target (using gdb 5.1), > and ran into a rather peculiar problem. I have two images.. the vmlinux.64 is > the one that is being booted on the target: > > vmlinux: ELF 32-bit MSB executable, mips-4 MIPS R3000_BE, version 1, > statically linked, not stripped > vmlinux.64: ELF 64-bit MSB executable, mips-4 MIPS R3000_BE, version 1, > statically linked, not stripped > > Upon trying to load these with gdb, the elf32 works just fine.. whereas the > elf64 complains about not being able to read ECOFF debugging information: > > lethal@freya:~$ mips64-linux-gdb vmlinux > GNU gdb 5.1 > Copyright 2001 Free Software Foundation, Inc. > GDB is free software, covered by the GNU General Public License, and you are > welcome to change it and/or distribute copies of it under certain conditions. > Type "show copying" to see the conditions. > There is absolutely no warranty for GDB. Type "show warranty" for details. > This GDB was configured as "--host=i686-pc-linux-gnu --target=mips64-linux"... > (gdb) > > lethal@freya:~$ mips64-linux-gdb vmlinux.64 > GNU gdb 5.1 > Copyright 2001 Free Software Foundation, Inc. > GDB is free software, covered by the GNU General Public License, and you are > welcome to change it and/or distribute copies of it under certain conditions. > Type "show copying" to see the conditions. > There is absolutely no warranty for GDB. Type "show warranty" for details. > This GDB was configured as "--host=i686-pc-linux-gnu > --target=mips64-linux"...Error reading ECOFF debugging information: File > truncated > > (gdb) > > The kernels were both compiled with CONFIG_REMOTE_DEBUG turned on, so they > were both compiled with -g. > > I've tried this with a --target of mips64-linux as well as mips64-linux-elf, > and the same thing happens both times. > > Anyone have any insight on this? What binutils version are you using to assemble (i.e. do you have ECOFF/mdebug information at all)? You're probably trying to use stabs (or mdebug) on a 64-bit binary. I know stabs will whine; I don't know if I've ever tried mdebug. You might want to use -gdwarf-2 instead, except of course Dwarf-2 is broken on MIPS this month. You might want to breakpoint in _bfd_mips_elf_read_ecoff_info in elf64-mips.c. I see that there's only a 32-bit version of this, so if any data structures change on 64-bit you'll lose. -- Daniel Jacobowitz Carnegie Mellon University MontaVista Software Debian GNU/Linux Developer