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b=dx9x4NmR4PLTBP0C2wz8YLx2Nk6PwOY6sL235tSOTPP/nd6cHb95lELvEkDgGLSp8e1GRHyyDrUjytEhk4zQLbuduLUVXdaA/YI4zGQ9616RBkovzGeUzoHhg5zAg+h5/jTod+lVp4xTFNhNAJyENXNE8Okvc/GtKjy8v+ROs5CUUGu6WEEBDg+QUQx2yQ3wZQFTG3IqqdkGV+6fAKZ4rs6k+oKzCcMP5tfj3jHJtJa3hHQb9nbHybLzDeyCc/3mcNk6VOZuIDKQEL7M4246LtEF2AqUVC5HyNBm4qIsZ6ei/wZuRuUVm23WakKO37MYOfekMLwiH5ED4IK4iLahNA== From: Djordje Todorovic To: "qemu-devel@nongnu.org" CC: "qemu-riscv@nongnu.org" , "cfu@mips.com" , "mst@redhat.com" , "marcel.apfelbaum@gmail.com" , "dbarboza@ventanamicro.com" , "philmd@linaro.org" , "alistair23@gmail.com" , "thuth@redhat.com" , Djordje Todorovic Subject: [PATCH v4 3/7] target/riscv: Set endianness MSTATUS bits at CPU reset Thread-Topic: [PATCH v4 3/7] target/riscv: Set endianness MSTATUS bits at CPU reset Thread-Index: AQHcuHsPNGAOt5LLwU2Y4KNNqM1iUQ== Date: Fri, 20 Mar 2026 15:05:59 +0000 Message-ID: <20260320150552.169480-4-djordje.todorovic@htecgroup.com> References: <20260320150552.169480-1-djordje.todorovic@htecgroup.com> In-Reply-To: <20260320150552.169480-1-djordje.todorovic@htecgroup.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=htecgroup.com; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f403:c201::1; envelope-from=Djordje.Todorovic@htecgroup.com; helo=AM0PR83CU005.outbound.protection.outlook.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, SPF_HELO_PASS=-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: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @htecgroup.com) X-ZM-MESSAGEID: 1774019223875154100 Content-Type: text/plain; charset="utf-8" When the big-endian CPU property is enabled, set the MSTATUS_UBE (User Big-Endian), MSTATUS_SBE (Supervisor Big-Endian), and MSTATUS_MBE (Machine Big-Endian) bits during CPU reset. This configures all privilege levels for big-endian data access, matching the RISC-V privileged specification's endianness control mechanism. Instructions remain little-endian regardless. Also update the disassembler comment to clarify that BFD_ENDIAN_LITTLE is correct because RISC-V instructions are always little-endian per the ISA specification. Signed-off-by: Djordje Todorovic --- target/riscv/cpu.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 4537305dfe..eed5afd27e 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -716,6 +716,9 @@ static void riscv_cpu_reset_hold(Object *obj, ResetType= type) env->mstatus =3D set_field(env->mstatus, MSTATUS_MDT, 1); } } + if (cpu->cfg.big_endian) { + env->mstatus |=3D MSTATUS_UBE | MSTATUS_SBE | MSTATUS_MBE; + } env->mcause =3D 0; env->miclaim =3D MIP_SGEIP; env->pc =3D env->resetvec; @@ -803,11 +806,8 @@ static void riscv_cpu_disas_set_info(const CPUState *s= , disassemble_info *info) info->target_info =3D &cpu->cfg; =20 /* - * A couple of bits in MSTATUS set the endianness: - * - MSTATUS_UBE (User-mode), - * - MSTATUS_SBE (Supervisor-mode), - * - MSTATUS_MBE (Machine-mode) - * but we don't implement that yet. + * RISC-V instructions are always little-endian, regardless of the + * data endianness configured via MSTATUS UBE/SBE/MBE bits. */ info->endian =3D BFD_ENDIAN_LITTLE; =20 --=20 2.34.1