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Tue, 03 Feb 2026 18:31:01 -0800 (PST) From: frank.chang@sifive.com To: qemu-devel@nongnu.org Cc: Palmer Dabbelt , Alistair Francis , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , qemu-riscv@nongnu.org (open list:RISC-V TCG CPUs), Frank Chang Subject: [PATCH] target/riscv: Mask xepc[0] only when Zc* extension is enabled Date: Wed, 4 Feb 2026 10:30:55 +0800 Message-ID: <20260204023055.589588-1-frank.chang@sifive.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::62e; envelope-from=frank.chang@sifive.com; helo=mail-pl1-x62e.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=unavailable 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 @sifive.com) X-ZM-MESSAGEID: 1770172306726158500 Content-Type: text/plain; charset="utf-8" From: Frank Chang IALIGN is 16 when the CPU supports the Zc* extension. We should only mask xepc[0] when the Zc* extension is enabled. Signed-off-by: Frank Chang --- target/riscv/internals.h | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/target/riscv/internals.h b/target/riscv/internals.h index 35b923c4bf5..d2a77c41047 100644 --- a/target/riscv/internals.h +++ b/target/riscv/internals.h @@ -160,9 +160,15 @@ static inline float16 check_nanbox_bf16(CPURISCVState = *env, uint64_t f) =20 static inline target_ulong get_xepc_mask(CPURISCVState *env) { - /* When IALIGN=3D32, both low bits must be zero. - * When IALIGN=3D16 (has C extension), only bit 0 must be zero. */ - if (riscv_has_ext(env, RVC)) { + RISCVCPU *cpu =3D env_archcpu(env); + + /* + * When IALIGN=3D32, both low bits must be zero. + * When IALIGN=3D16 (has C or Zc* extensions), only bit 0 must be zero. + */ + if (riscv_has_ext(env, RVC) || cpu->cfg.ext_zca || + cpu->cfg.ext_zcb || cpu->cfg.ext_zcd || cpu->cfg.ext_zce || + cpu->cfg.ext_zcf || cpu->cfg.ext_zcmp || cpu->cfg.ext_zcmt) { return ~(target_ulong)1; } else { return ~(target_ulong)3; --=20 2.43.0