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Fri, 05 Nov 2021 09:16:00 -0700 (PDT) Received: from zen (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id CF11F1FF96; Fri, 5 Nov 2021 16:15:56 +0000 (GMT) References: <20210115130828.23968-1-alex.bennee@linaro.org> <20210115130828.23968-22-alex.bennee@linaro.org> <540354a8-bcba-aa82-814d-7f11dc75f5bf@suse.de> <874kjdugip.fsf@linaro.org> <8cb88b76-caa3-ba26-b288-4d87b06f56ec@suse.de> <871regvs0w.fsf@linaro.org> <3c1521e5-5182-18f3-b5bf-9340745ec92f@linaro.org> <1b2ee804-6360-c77f-45f2-8fe39e39f9d9@linaro.org> User-agent: mu4e 1.7.4; emacs 28.0.60 From: Alex =?utf-8?Q?Benn=C3=A9e?= To: Luis Machado Subject: Re: [PULL 21/30] target/arm: use official org.gnu.gdb.aarch64.sve layout for registers Date: Fri, 05 Nov 2021 16:15:39 +0000 In-reply-to: <1b2ee804-6360-c77f-45f2-8fe39e39f9d9@linaro.org> Message-ID: <87v916h937.fsf@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=2a00:1450:4864:20::42d; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x42d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , "open list:ARM TCG CPUs" , Claudio Fontana , QEMU Developers Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Luis Machado writes: > On 11/4/21 6:03 PM, Luis Machado wrote: >> On 10/4/21 3:44 PM, Luis Machado wrote: >>> Hi, >>> >>> On 9/21/21 10:55 AM, Peter Maydell wrote: >>>> On Tue, 19 Jan 2021 at 15:57, Alex Benn=C3=A9e >>>> wrote: >>>>> >>>>> >>>>> Claudio Fontana writes: >>>>> >>>>>> On 1/19/21 3:50 PM, Alex Benn=C3=A9e wrote: >>>>>>> >>>>>>> Claudio Fontana writes: >>>>>>>> qemu-system-aarch64: -gdb >>>>>>>> unix:path=3D/tmp/tmp9ru5tgk8qemu-gdbstub/gdbstub.socket,server: >>>>>>>> info: QEMU waiting for connection on: >>>>>>>> disconnected:unix:/tmp/tmp9ru5tgk8qemu-gdbstub/gdbstub.socket,serv= er >>>>>>>> warning: while parsing target description (at line 47): Vector >>>>>>>> "svevhf" references undefined type "ieee_half" >>>>>>>> warning: Could not load XML target description; ignoring >>>>>>>> qemu-system-aarch64: QEMU: Terminated via GDBstub >>>>>>>> >>>>>>>> Seems to indicate it is "ieee_half" -related? >>>> >>>>> So it looks like TDESC_TYPE_IEEE_HALF was only implemented in GDB 9.1 >>>>> and there is no probing possible during the gdbstub connection. I gue= ss >>>>> I can either go back to stubbing it out (which would break gdb's SVE >>>>> understanding) or up our minimum GDB version check for running tests. >>>>> That would mean less people test GDB (or at least until the distros >>>>> catch up) but considering it was zero people not too long ago maybe >>>>> that's acceptable? >>>> >>>> I just ran into this trying to connect qemu-aarch64 to the >>>> Ubuntu gdb-multiarch. I don't care about SVE at all in this >>>> case, but the 'max' CPU includes SVE by default, so we report >>>> it to gdb even if the guest program being run doesn't use SVE at all. >>>> This effectively means that usecases that used to work no longer do :-( >>>> >>>> Luis: do we really have to report to gdb all the possible >>>> data types that might be in SVE vector registers? Won't >>>> gdb autogenerate pseudoregisters the way it does with >>>> Neon d0..d31 ? >>>> >>>> thanks >>>> -- PMM >>>> >>> >>> I'll check what can be done here. >> Apologies. I got sidetracked with a few other things. I'm getting >> back to this one. >> I'm guessing the less painful solution would be for QEMU to report a >> more compact XML description for SVE, supported by the oldest GDB we >> would like to validate things on, and leave it to GDB (newer >> releases) to add whatever pseudo-registers it deems appropriate. > > Is it only the ieee_half type that is causing issues here? Or are > there other types? That was the only one I noticed - which makes sense as it's a fairly new type. --=20 Alex Benn=C3=A9e