From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 25462 invoked by alias); 8 Oct 2012 20:22:19 -0000 Received: (qmail 25451 invoked by uid 22791); 8 Oct 2012 20:22:18 -0000 X-SWARE-Spam-Status: No, hits=-4.0 required=5.0 tests=AWL,BAYES_00,KHOP_THREADED,RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from sibelius.xs4all.nl (HELO glazunov.sibelius.xs4all.nl) (83.163.83.176) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 08 Oct 2012 20:22:13 +0000 Received: from glazunov.sibelius.xs4all.nl (kettenis@localhost [127.0.0.1]) by glazunov.sibelius.xs4all.nl (8.14.5/8.14.3) with ESMTP id q98KM9dm008831; Mon, 8 Oct 2012 22:22:09 +0200 (CEST) Received: (from kettenis@localhost) by glazunov.sibelius.xs4all.nl (8.14.5/8.14.3/Submit) id q98KM82d014759; Mon, 8 Oct 2012 22:22:08 +0200 (CEST) Date: Mon, 08 Oct 2012 20:22:00 -0000 Message-Id: <201210082022.q98KM82d014759@glazunov.sibelius.xs4all.nl> From: Mark Kettenis To: hjl.tools@gmail.com CC: gdb-patches@sourceware.org In-reply-to: (hjl.tools@gmail.com) Subject: Re: PING: PATCH: PR backtrace/14646: [x32] backtrace doesn't work References: <20121003154712.GH3028@adacore.com> <201210040657.q946vJlc006566@glazunov.sibelius.xs4all.nl> <201210081948.q98Jm3D7020175@glazunov.sibelius.xs4all.nl> 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: 2012-10/txt/msg00138.txt.bz2 > Date: Mon, 8 Oct 2012 13:04:03 -0700 > From: "H.J. Lu" > > On Mon, Oct 8, 2012 at 12:48 PM, Mark Kettenis wrote: > >> Date: Thu, 4 Oct 2012 06:57:22 -0700 > >> From: "H.J. Lu" > >> > >> On Wed, Oct 3, 2012 at 11:57 PM, Mark Kettenis wrote: > >> > > >> > Perhaps the user-regs.c mechanism can be used to establish eip -> pc > >> > and esp -> sp mappings? > >> > >> It doesn't help as long as gdbarch_pc_regnum/gdbarch_sp_regnum > >> are used for both frame pc/sp value and unwind pc/sp value. For x32, > >> we want eip/esp for frame pc/sp value and rip/rsp for unwind pc/sp > >> value. > > > > That probably means we need to set gdbarch_pc_regnum (and > > gdbarch_sp_regnum) to -1 for x32. > > We can't set gdbarch_pc_regnum/gdbarch_sp_regnum to -1: > > > GNU gdb (GDB) 7.5.50.20121008-cvs > Copyright (C) 2012 Free Software Foundation, Inc. > License GPLv3+: GNU GPL version 3 or later > This is free software: you are free to change and redistribute it. > There is NO WARRANTY, to the extent permitted by law. Type "show copying" > and "show warranty" for details. > This GDB was configured as "x86_64-unknown-linux-gnu". > For bug reporting instructions, please see: > ... > Reading symbols from > /export/build/gnu/glibc-x32/build-x86_64-linux/elf/sln...done. > (gdb) b main > Breakpoint 1 at 0x400c20: file sln.c, line 50. > (gdb) r > Starting program: /export/build/gnu/glibc-x32/build-x86_64-linux/elf/sln > /export/gnu/import/git/gdb/gdb/regcache.c:1062: internal-error: > regcache_read_pc: Unable to find PC > A problem internal to GDB has been detected, > further debugging may prove unreliable. > Quit this debugging session? (y or n) Well, obviously you'll need to implement gdbarch_read_pc() for this to work. And probably a few more gdbarch methods.