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Date: Tue, 30 Nov 2004 11:12:00 -0000
From: "jcownie at etnus dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20041130111223.18736.jcownie@etnus.com>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug debug/18736] New: Return address column in .debug_frame is incorrect
X-Bugzilla-Reason: CC
X-SW-Source: 2004-11/txt/msg03779.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

The return address column stated in the .debug_frame information for
code compiled -g is 65, however the actual unwind information refers to
register 108 when describing the return address.

This appears to be a result of the different register mappings used in
.debug_frame and .eh_frame. In .eh_frame register 65 is used both in the CIE and
in the following data.

This makes the .debug_frame information useless for backtracing, since no 
valid return information is accessible.

-- 
           Summary: Return address column in .debug_frame is incorrect
           Product: gcc
           Version: 3.3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jcownie at etnus dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: powerpc-suse-linux
  GCC host triplet: powerpc-suse-linux
GCC target triplet: powerpc-suse-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18736