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Tue, 27 Jan 2026 03:32:09 -0800 (PST) MIME-Version: 1.0 Date: Tue, 27 Jan 2026 11:31:58 +0000 X-Gm-Features: AZwV_QgSiyY0JcIJAjUBK_1XmLVzAp5bWUd821lQqjr2RYMtXsY1z67OcYMV4PQ Message-ID: Subject: gdb support for SME-without-SVE ? To: gdb@sourceware.org Cc: Manos Pitsidianakis , luis.machado.foss@gmail.com Content-Type: text/plain; charset="UTF-8" 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: Peter Maydell via Gdb Reply-To: Peter Maydell Errors-To: gdb-bounces~public-inbox=simark.ca@sourceware.org Sender: "Gdb" Hi: is GDB for Arm intended to support configurations where the target CPU has SME but not SVE? 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? 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