From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-385158-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 27548 invoked by alias); 2 Mar 2012 12:19:59 -0000
Received: (qmail 27539 invoked by uid 22791); 2 Mar 2012 12:19:57 -0000
X-SWARE-Spam-Status: No, hits=-2.7 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00,SARE_SUB_OBFU_Z
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 02 Mar 2012 12:19:45 +0000
From: "gjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/52461] New: [avr] XMEGA+EBI: RAMPZ clobbered while reading from flash
Date: Fri, 02 Mar 2012 12:19:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: gjl at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-52461-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2012-03/txt/msg00211.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52461

             Bug #: 52461
           Summary: [avr] XMEGA+EBI: RAMPZ clobbered while reading from
                    flash
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: gjl@gcc.gnu.org
            Target: avr


To read from flash on devices with more than 64KiB of flash, RAMPZ is set
appropriately before using ELPM instruction.

Devices with external bus interface (EBI) use RAMPZ as high part of the RAM
address while reading from RAM.

Thus, and RAM read on EBI device that is performed via Z will fail after data
has been read from Flash.