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CTRY:IE; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:64aa7808-outbound-1.mta.getcheckrecipient.com; PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com; CAT:NONE; SFS:(13230031)(36860700004)(376005)(82310400014); DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Mar 2024 15:25:33.1100 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9fb26a3e-53c0-4847-2146-08dc3c5f5557 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB1PEPF00039230.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB8013 X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, BODY_8BITS, DKIM_SIGNED, DKIM_VALID, FORGED_SPF_HELO, KAM_DMARC_NONE, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE, UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces+public-inbox=simark.ca@sourceware.org On 2/18/24 13:30, Tom de Vries wrote: > On 2/18/24 05:09, Kevin Buettner wrote: >> Hi Tom, >> >> On Tue, 13 Feb 2024 18:17:18 +0100 >> Tom de Vries wrote: >> >>> On arm-linux, with a started hello world, running "info frame" works fine, but >>> when I set debug frame to on, I run into: >>> ... >>> (gdb) info frame >>>    ... >>> [frame] frame_unwind_register_value: exit >>> value is not available >>> (gdb) >>> ... >>> >>> The problem is here in frame_unwind_register_value: >>> ... >>>            if (value->lazy ()) >>>              gdb_printf (&debug_file, " lazy"); >>>            else >>>              { >>>                int i; >>>                gdb::array_view buf = value->contents (); >>> ... >>> where we call value->contents () while !value->entirely_available (). >>> >>> Fix this by checking value->entirely_available () and printing: >>> ... >>>      [frame] frame_unwind_register_value:   -> register=91 unavailable >>> ... >>> >>> Tested on arm-linux. >> >> The fix looks good to me. >> >> I'm wondering about the test case though.  Is it the case that the >> failure depends on debug info from a particular compiler (or compiler >> version)?  If so, would it be possible to devise a test using the >> DWARF assembler which would not be dependent on compiler output that >> may change over time? >> > > Hi Kevin, > > thanks for the review. > > This doesn't depend on debug info.  The test-case depends on a register being unavailable.  I don't know if or how we can reliably enforce this condition in a test-case. > > To give some more detail, a minimal way to show the register as unavailable is: > ... > $ gcc hello.c > $ gdb -q -batch a.out -ex start -ex 'p $tpidruro' > Temporary breakpoint 1 at 0x512 > > Temporary breakpoint 1, 0xaaaaa512 in main () > $1 = > ... > > I'm not sure why it's unavailable. > > It seems the register was added as part of some tls support for fbsd arm tdep.  It could be that support for the register is missing in linux arm tdep. > > It also could be a kernel problem (used kernel is 4.4.190). > > Or, something to do with the fact that I'm running a pinebook with 64-bit kernel, 32-bit userland setup. > > Luis, any comments on this?  Is this a bug, or a missing feature, or expected behaviour? > > Thanks, > - Tom > >> Kevin >> > Hi Tom, I was out on time off. It looks like Thiago addressed this in a separate thread, is that right?