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Mon, 11 May 2026 17:50:52 -0700 (PDT) MIME-Version: 1.0 From: Antony Pavlov Date: Tue, 12 May 2026 03:50:29 +0300 X-Gm-Features: AVHnY4IDtxg25AxwjAG0kPonG5ORz8ZDdFugJqkITJqw2Dhk3YDZGWxl7n7awTw Message-ID: Subject: target/riscv: rdcycleh problem To: Alistair Francis Cc: QEMU Developers Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::e2b; envelope-from=antonynpavlov@gmail.com; helo=mail-vs1-xe2b.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, FREEMAIL_FROM=0.001, 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-Mailman-Approved-At: Mon, 11 May 2026 20:54:08 -0400 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 @gmail.com) X-ZM-MESSAGEID: 1778547326676154100 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Hi! I use qemu-system-riscv32 v11.0.0 for running this code: 15258: c80025f3 rdcycleh a1 1525c: c0002573 rdcycle a0 15260: c80027f3 rdcycleh a5 15264: fef59ae3 bne a1,a5,15258 The code is recommended by riscv specification for reading 64-bit cycle counter on 32-bit system (see https://docs.riscv.org/reference/isa/unpriv/counters.html#7-1-1-zicntr-exte= nsion-for-base-counters-and-timers for details). When running on qemu-system-riscv32 both the rdcycle and the rdcycleh instructions read low 32-bit of the cycle counter so the branch instruction always go to 15258. This quick and dirty patch fixes my problem: --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -1389,8 +1389,11 @@ RISCVException riscv_pmu_read_ctr(CPURISCVState *env, target_ulong *val, */ if (riscv_pmu_ctr_monitor_cycles(env, ctr_idx) || riscv_pmu_ctr_monitor_instructions(env, ctr_idx)) { - *val =3D riscv_pmu_ctr_get_fixed_counters_val(env, ctr_idx) - + uint64_t t; + + t =3D riscv_pmu_ctr_get_fixed_counters_val(env, ctr_idx) - ctr_prev + ctr_val; + *val =3D extract64(t, start, length); } else { *val =3D ctr_val; } Have you any suggestion? --=20 Best regards, Antony Pavlov