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Tue, 27 Feb 2024 16:19:18 +0000 Message-ID: Date: Tue, 27 Feb 2024 17:19:29 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] [gdb] Fix "value is not available" with debug frame Content-Language: en-US To: Simon Marchi , Thiago Jung Bauermann Cc: Kevin Buettner , Luis Machado , gdb-patches@sourceware.org References: <20240213171718.8934-1-tdevries@suse.de> <20240217210947.20211db0@f39-zbm-amd> <60882190-1fd7-45fc-a19b-661c027df154@suse.de> <877ciqg8it.fsf@linaro.org> <38d9df8e-75f0-4a28-833c-06429ab94ccd@simark.ca> From: Tom de Vries In-Reply-To: <38d9df8e-75f0-4a28-833c-06429ab94ccd@simark.ca> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Authentication-Results: smtp-out2.suse.de; none X-Spamd-Result: default: False [-3.09 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; XM_UA_NO_VERSION(0.01)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; BAYES_HAM(-3.00)[100.00%]; MIME_GOOD(-0.10)[text/plain]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_ALL(0.00)[]; MID_RHS_MATCH_FROM(0.00)[] X-Spam-Level: X-Spam-Score: -3.09 X-Spam-Status: No, score=-6.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham 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 2/26/24 23:41, Simon Marchi wrote: > On 2/26/24 17:34, Thiago Jung Bauermann wrote: >> >> Tom de Vries writes: >>> 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). >> >> I did a bit of digging today and the $tpidruro register isn't available >> via ptrace in the 32-bit Linux kernel, but it is available for an >> aarch32 program running under an arm64 Linux kernel via the ptrace >> compat interface. >> >> Support for this isn't implemented in GDB however, so at least for now >> IMHO it makes sense to disable the org.gnu.gdb.arm.tls feature in >> arm-linux and arm-netbsd (which from a quick look at arm-netbsd-nat.c >> also doesn't seem to support accessing $tpidruro either). >> >> I'm testing a patch that does this and I'll post it if there are no >> regressions. > > Thanks, I think that would make sense. > > The only time we should be seeing some "unavailable" registers or memory > is in the context of tracepoints, for things that are not collected. > Seeing an unavailable register here is a sign that something is not > right. In that case, I've filed a PR ( https://sourceware.org/bugzilla/show_bug.cgi?id=31418 ) to track this problem. Thanks, - Tom