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Tue, 27 Jan 2026 16:42:38 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: Date: Wed, 28 Jan 2026 00:42:30 +0000 X-Gm-Features: AZwV_QiHTuZFKjlRGr0I-g3_5b3oUSgGlZJ_3nwlr-y7eowwLpUENh3WZef1fss Message-ID: Subject: Re: gdb support for SME-without-SVE ? To: Peter Maydell Cc: gdb@sourceware.org, Manos Pitsidianakis Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.30 X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Luis via Gdb Reply-To: Luis Errors-To: gdb-bounces~public-inbox=simark.ca@sourceware.org Sender: "Gdb" On Tue, Jan 27, 2026, 11:32 Peter Maydell wrote: > Hi: is GDB for Arm intended to support configurations where the target > CPU has SME but not SVE? > Technically yes, but I haven't exercised that scenario that much. I'd assume it broken. At the time the prospect was to have both SVE and SME. But that changed a bit over time and nobody enabled that in gdb. > We're just implementing support for that in QEMU for using SME > with the hvf hypervisor accelerator on macos systems, but when > we tried connecting gdb to QEMU gdb crashed: > > (gdb) target remote localhost:1234 > Remote debugging using localhost:1234 > ../../gdb/aarch64-tdep.c:3068: internal-error: > aarch64_pseudo_register_type: bad register number 160 > A problem internal to GDB has been detected, > further debugging may prove unreliable. > Fatal signal: Abort trap: 6 > > > https://lore.kernel.org/qemu-devel/CAAjaMXZLG2aBtStRhyvmdENj1Z+Mx05BmDgyYUoYrc_ZnHwyVQ@mail.gmail.com/ > > Is this a known missing feature in GDB, or is it a config that's > supposed to work but we've got the XML register description wrong > somehow? > I'd say missing. And apparently gdb is not well guarded against it. > It looks from the aarch64-tdep.c code like perhaps GDB assumes > that the Vn vector registers only exist with SVE, but they also > exist in SME-only CPUs. > > thanks > -- PMM >