From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 8672 invoked by alias); 29 Oct 2006 22:39:21 -0000 Received: (qmail 8663 invoked by uid 22791); 29 Oct 2006 22:39:20 -0000 X-Spam-Check-By: sourceware.org Received: from 195.22.55.53.adsl.nextra.cz (HELO host0.dyn.jankratochvil.net) (195.22.55.53) by sourceware.org (qpsmtpd/0.31) with ESMTP; Sun, 29 Oct 2006 22:39:17 +0000 Received: from host0.dyn.jankratochvil.net (localhost [127.0.0.1]) by host0.dyn.jankratochvil.net (8.13.8/8.13.8) with ESMTP id k9TMdDqS025018 for ; Sun, 29 Oct 2006 23:39:13 +0100 Received: (from jkratoch@localhost) by host0.dyn.jankratochvil.net (8.13.8/8.13.8/Submit) id k9TMdDeQ025017 for gdb-patches@sourceware.org; Sun, 29 Oct 2006 23:39:13 +0100 Date: Sun, 29 Oct 2006 22:39:00 -0000 From: Jan Kratochvil To: gdb-patches@sourceware.org Subject: [review] Fix backtrace of prelinked libc with separate debuginfo Message-ID: <20061029223912.GA24248@host0.dyn.jankratochvil.net> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="ZGiS0Q5IWpPtfppv" Content-Disposition: inline User-Agent: Mutt/1.4.2.2i X-IsSubscribed: yes Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org X-SW-Source: 2006-10/txt/msg00305.txt.bz2 --ZGiS0Q5IWpPtfppv Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-length: 873 Hi, currently (on Fedora Core 6) after installation of /usr/lib/debug separate debuginfo files the backtraces no longer display some libc functions: #5 #6 0x00c98402 in __kernel_vsyscall () #7 0x0077ebc6 in ?? () from /lib/i686/nosegneg/libc.so.6 #8 0x08048444 in main () at doublesym.c:15 while after `rm -rf /usr/lib/debug': #5 #6 0x0087b402 in __kernel_vsyscall () #7 0x0077ebc6 in __pause_nocancel () from /lib/i686/nosegneg/libc.so.6 #8 0x08048444 in main () at doublesym.c:15 It is (I believe) due to the fact the system libc gets prelinked to some address but the separate debuginfo file is not updated for the prelinked address. `matching_bfd_sections' will fail to match afterwards. Not sure if the testcase properly fails on all systems, it works for me with the prelinking in effect. Regards, Jan --ZGiS0Q5IWpPtfppv Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="gdb-cvs-relativedebug.patch" Content-length: 5091 2006-10-29 Jan Kratochvil * gdb/symtab.c (matching_bfd_sections): Fix VMA matching for objects loaded at a different address than stored on the disk. 2006-10-29 Jan Kratochvil * gdb.base/relativedebug.c, gdb.base/relativedebug.exp: New file, resolving of PC in libc pause(3) (with possibly different on-disk VMA). Index: gdb/symtab.c =================================================================== --- gdb/symtab.c 17 Oct 2006 20:17:44 -0000 1.148 +++ gdb/symtab.c 29 Oct 2006 22:29:21 -0000 @@ -739,8 +739,11 @@ matching_bfd_sections (asection *first, if (bfd_get_section_size (first) != bfd_get_section_size (second)) return 0; + /* In-memory addresses may start at a different offset, relativize them. */ if (bfd_get_section_vma (first->owner, first) - != bfd_get_section_vma (second->owner, second)) + - bfd_get_start_address (first->owner) + != bfd_get_section_vma (second->owner, second) + - bfd_get_start_address (second->owner)) return 0; if (bfd_get_section_name (first->owner, first) == NULL Index: gdb/testsuite/gdb.base/relativedebug.c =================================================================== --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ gdb/testsuite/gdb.base/relativedebug.c 29 Oct 2006 22:29:21 -0000 @@ -0,0 +1,37 @@ +/* This testcase is part of GDB, the GNU debugger. + + Copyright 2006 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ + +#include +#include +#include + + +static void handler (int signo) +{ + abort (); +} + +int main (void) +{ + signal (SIGALRM, handler); + alarm (1); + pause (); + pause (); + return 0; +} Index: gdb/testsuite/gdb.base/relativedebug.exp =================================================================== --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ gdb/testsuite/gdb.base/relativedebug.exp 29 Oct 2006 22:29:21 -0000 @@ -0,0 +1,68 @@ +# Copyright 2006 Free Software Foundation, Inc. + +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +if $tracelevel then { + strace $tracelevel +} + +set testfile relativedebug +set srcfile ${testfile}.c +set binfile ${objdir}/${subdir}/${testfile} +if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } { + untested "Couldn't compile test program" + return -1 +} + +# Get things started. + +gdb_exit +gdb_start +gdb_reinitialize_dir $srcdir/$subdir +gdb_load ${binfile} + +# pause () -> SIGALRM -> handler () -> abort () + +gdb_test "run" \ + ".*Program received signal SIGABRT, Aborted..*" \ + "run" + +# incorrect (#6): +# (gdb) bt +# #0 0x00325402 in __kernel_vsyscall () +# #1 0x00718f20 in *__GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64 +# #2 0x0071a801 in *__GI_abort () at abort.c:88 +# #3 0x0804841f in handler (signo=14) at ./gdb.base/relativedebug.c:27 +# #4 +# #5 0x00325402 in __kernel_vsyscall () +# #6 0x0077ebc6 in ?? () from /lib/i686/nosegneg/libc.so.6 +# #7 0x08048455 in main () at ./gdb.base/relativedebug.c:34 +# (gdb) + +# correct (#6): +# (gdb) bt +# #0 0x00b33402 in __kernel_vsyscall () +# #1 0x00718f20 in *__GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64 +# #2 0x0071a801 in *__GI_abort () at abort.c:88 +# #3 0x0804841f in handler (signo=14) at ./gdb.base/relativedebug.c:27 +# #4 +# #5 0x00b33402 in __kernel_vsyscall () +# #6 0x0077ebc6 in __pause_nocancel () from /lib/i686/nosegneg/libc.so.6 +# #7 0x08048455 in main () at ./gdb.base/relativedebug.c:34 +# (gdb) + +gdb_test "bt" \ + ".*\[^a-zA-Z\]pause\[^a-zA-Z\].*" \ + "pause(3) seen there" --ZGiS0Q5IWpPtfppv--