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Iglesias" To: qemu-devel@nongnu.org, "Edgar E. Iglesias" Cc: richard.henderson@linaro.org, philmd@linaro.org, edgar.iglesias@amd.com Subject: [PATCH v2 1/3] target/microblaze: Remove unused arg from check_divz() Date: Mon, 25 Aug 2025 13:20:49 +0200 Message-ID: <20250825112051.4155931-2-edgar.iglesias@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250825112051.4155931-1-edgar.iglesias@gmail.com> References: <20250825112051.4155931-1-edgar.iglesias@gmail.com> 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=2a00:1450:4864:20::22c; envelope-from=edgar.iglesias@gmail.com; helo=mail-lj1-x22c.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-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: 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: 1756120911335124100 Content-Type: text/plain; charset="utf-8" From: "Edgar E. Iglesias" Remove unused arg from check_divz(). No functional change. Signed-off-by: Edgar E. Iglesias Reviewed-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- target/microblaze/op_helper.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/target/microblaze/op_helper.c b/target/microblaze/op_helper.c index b8365b3b1d..470526ee92 100644 --- a/target/microblaze/op_helper.c +++ b/target/microblaze/op_helper.c @@ -69,7 +69,7 @@ void helper_raise_exception(CPUMBState *env, uint32_t ind= ex) cpu_loop_exit(cs); } =20 -static bool check_divz(CPUMBState *env, uint32_t a, uint32_t b, uintptr_t = ra) +static bool check_divz(CPUMBState *env, uint32_t b, uintptr_t ra) { if (unlikely(b =3D=3D 0)) { env->msr |=3D MSR_DZ; @@ -89,7 +89,7 @@ static bool check_divz(CPUMBState *env, uint32_t a, uint3= 2_t b, uintptr_t ra) =20 uint32_t helper_divs(CPUMBState *env, uint32_t a, uint32_t b) { - if (!check_divz(env, a, b, GETPC())) { + if (!check_divz(env, b, GETPC())) { return 0; } return (int32_t)a / (int32_t)b; @@ -97,7 +97,7 @@ uint32_t helper_divs(CPUMBState *env, uint32_t a, uint32_= t b) =20 uint32_t helper_divu(CPUMBState *env, uint32_t a, uint32_t b) { - if (!check_divz(env, a, b, GETPC())) { + if (!check_divz(env, b, GETPC())) { return 0; } return a / b; --=20 2.43.0 From nobody Sat Nov 15 03:05:04 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1756120894; cv=none; d=zohomail.com; s=zohoarc; b=ih3eZBgjJdO6784eAjlnYh4g+MqMs+5tpr03iqyrY5LHWqcu0f7KLbNbA34lWx+OzjGjA9Fnt0b/wb7jc+mu21ZMQjShfe96vRy2S9SaDh6sejuK6YaCWFUbEQwk0WLFduEaiNLQbcvxXaGZXnPXHmk12Q5l5OkdtV2hA3lOVFw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1756120894; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=7aZ7WRieTxHOe4UDLjbjFmRke7uWAvoTTSDbNjcwRWk=; b=BRA13BBjd1iAIagtrEx9B58A1yXKkxuVfuCKbAGlgcBuVOHSXUhT69jZqoPC2QVmT/MwIbVXxqAfhkU2g9ONR6LFS8mVaxoeMzGOhhiP7GljdrhVqwLQlr10OasLwNfuks6EwpY59eJdvtpydIGQEPiPZXKlkO3k7NRW513gYY8= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1756120894158510.1641019340642; Mon, 25 Aug 2025 04:21:34 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uqVGD-0006f9-VI; Mon, 25 Aug 2025 07:21:14 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uqVGC-0006e9-Ey for qemu-devel@nongnu.org; Mon, 25 Aug 2025 07:21:12 -0400 Received: from mail-lf1-x12f.google.com ([2a00:1450:4864:20::12f]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1uqVG8-0004Xd-1t for qemu-devel@nongnu.org; Mon, 25 Aug 2025 07:21:12 -0400 Received: by mail-lf1-x12f.google.com with SMTP id 2adb3069b0e04-55f4345cfd3so975506e87.1 for ; Mon, 25 Aug 2025 04:21:07 -0700 (PDT) Received: from gmail.com (213-67-3-247-no600.tbcn.telia.com. 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Iglesias" To: qemu-devel@nongnu.org, "Edgar E. Iglesias" Cc: richard.henderson@linaro.org, philmd@linaro.org, edgar.iglesias@amd.com Subject: [PATCH v2 2/3] target/microblaze: div: Break out raise_divzero() Date: Mon, 25 Aug 2025 13:20:50 +0200 Message-ID: <20250825112051.4155931-3-edgar.iglesias@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250825112051.4155931-1-edgar.iglesias@gmail.com> References: <20250825112051.4155931-1-edgar.iglesias@gmail.com> 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=2a00:1450:4864:20::12f; envelope-from=edgar.iglesias@gmail.com; helo=mail-lf1-x12f.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-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: 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: 1756120913079124100 Content-Type: text/plain; charset="utf-8" From: "Edgar E. Iglesias" Break out raise_divzero() and take the opportunity to rename and reorder function args to better match with spec and pseudo code. No functional change. Signed-off-by: Edgar E. Iglesias Reviewed-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- target/microblaze/op_helper.c | 38 +++++++++++++++++------------------ target/microblaze/translate.c | 12 ++--------- 2 files changed, 20 insertions(+), 30 deletions(-) diff --git a/target/microblaze/op_helper.c b/target/microblaze/op_helper.c index 470526ee92..fbc9c8ca4f 100644 --- a/target/microblaze/op_helper.c +++ b/target/microblaze/op_helper.c @@ -69,38 +69,36 @@ void helper_raise_exception(CPUMBState *env, uint32_t i= ndex) cpu_loop_exit(cs); } =20 -static bool check_divz(CPUMBState *env, uint32_t b, uintptr_t ra) +/* Raises ESR_EC_DIVZERO if exceptions are enabled. */ +static void raise_divzero(CPUMBState *env, uint32_t esr, uintptr_t unwind_= pc) { - if (unlikely(b =3D=3D 0)) { - env->msr |=3D MSR_DZ; - - if ((env->msr & MSR_EE) && - env_archcpu(env)->cfg.div_zero_exception) { - CPUState *cs =3D env_cpu(env); - - env->esr =3D ESR_EC_DIVZERO; - cs->exception_index =3D EXCP_HW_EXCP; - cpu_loop_exit_restore(cs, ra); - } - return false; + env->msr |=3D MSR_DZ; + + if ((env->msr & MSR_EE) && env_archcpu(env)->cfg.div_zero_exception) { + CPUState *cs =3D env_cpu(env); + + env->esr =3D esr; + cs->exception_index =3D EXCP_HW_EXCP; + cpu_loop_exit_restore(cs, unwind_pc); } - return true; } =20 -uint32_t helper_divs(CPUMBState *env, uint32_t a, uint32_t b) +uint32_t helper_divs(CPUMBState *env, uint32_t ra, uint32_t rb) { - if (!check_divz(env, b, GETPC())) { + if (!ra) { + raise_divzero(env, ESR_EC_DIVZERO, GETPC()); return 0; } - return (int32_t)a / (int32_t)b; + return (int32_t)rb / (int32_t)ra; } =20 -uint32_t helper_divu(CPUMBState *env, uint32_t a, uint32_t b) +uint32_t helper_divu(CPUMBState *env, uint32_t ra, uint32_t rb) { - if (!check_divz(env, b, GETPC())) { + if (!ra) { + raise_divzero(env, ESR_EC_DIVZERO, GETPC()); return 0; } - return a / b; + return rb / ra; } =20 /* raise FPU exception. */ diff --git a/target/microblaze/translate.c b/target/microblaze/translate.c index 5098a1db4d..2f5fd5c271 100644 --- a/target/microblaze/translate.c +++ b/target/microblaze/translate.c @@ -450,16 +450,8 @@ DO_TYPEA0_CFG(flt, use_fpu >=3D 2, true, gen_flt) DO_TYPEA0_CFG(fint, use_fpu >=3D 2, true, gen_fint) DO_TYPEA0_CFG(fsqrt, use_fpu >=3D 2, true, gen_fsqrt) =20 -/* Does not use ENV_WRAPPER3, because arguments are swapped as well. */ -static void gen_idiv(TCGv_i32 out, TCGv_i32 ina, TCGv_i32 inb) -{ - gen_helper_divs(out, tcg_env, inb, ina); -} - -static void gen_idivu(TCGv_i32 out, TCGv_i32 ina, TCGv_i32 inb) -{ - gen_helper_divu(out, tcg_env, inb, ina); -} +ENV_WRAPPER3(gen_idiv, gen_helper_divs) +ENV_WRAPPER3(gen_idivu, gen_helper_divu) =20 DO_TYPEA_CFG(idiv, use_div, true, gen_idiv) DO_TYPEA_CFG(idivu, use_div, true, gen_idivu) --=20 2.43.0 From nobody Sat Nov 15 03:05:04 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1756120905; cv=none; d=zohomail.com; s=zohoarc; b=eiWuT3dgUGyNheZ2XNcrI9pcZiOBtOvxwiROWGLCkdu8bBpDCbAiO5WbaBmmjwXVmwB8lzNBMFWBLak3jLJBX20HtPV67gmWCtthNKWIdQ7GZbc7qplWPbXvrDhCXnIH0PMvBqI+U/1o0he/jbuYMLBuzMF5crHXrl/NlIYVVj8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1756120905; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; 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Iglesias" To: qemu-devel@nongnu.org, "Edgar E. Iglesias" Cc: richard.henderson@linaro.org, philmd@linaro.org, edgar.iglesias@amd.com Subject: [PATCH v2 3/3] target/microblaze: Handle signed division overflows Date: Mon, 25 Aug 2025 13:20:51 +0200 Message-ID: <20250825112051.4155931-4-edgar.iglesias@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250825112051.4155931-1-edgar.iglesias@gmail.com> References: <20250825112051.4155931-1-edgar.iglesias@gmail.com> 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=2a00:1450:4864:20::12c; envelope-from=edgar.iglesias@gmail.com; helo=mail-lf1-x12c.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-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: 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: 1756120908191116600 Content-Type: text/plain; charset="utf-8" From: "Edgar E. Iglesias" Handle signed division overflows as specified in UG984: https://docs.amd.com/r/en-US/ug984-vivado-microblaze-ref/idiv Signed-off-by: Edgar E. Iglesias Reviewed-by: Richard Henderson --- target/microblaze/cpu.h | 1 + target/microblaze/op_helper.c | 15 +++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/target/microblaze/cpu.h b/target/microblaze/cpu.h index 3ce28b302f..c9bf9361db 100644 --- a/target/microblaze/cpu.h +++ b/target/microblaze/cpu.h @@ -87,6 +87,7 @@ typedef struct CPUArchState CPUMBState; #define ESR_ESS_FSL_OFFSET 5 =20 #define ESR_ESS_MASK (0x7f << 5) +#define ESR_ESS_DEC_OF (1 << 11) /* DEC: 0=3DDBZ, 1=3DOF */ =20 #define ESR_EC_FSL 0 #define ESR_EC_UNALIGNED_DATA 1 diff --git a/target/microblaze/op_helper.c b/target/microblaze/op_helper.c index fbc9c8ca4f..c704233c8c 100644 --- a/target/microblaze/op_helper.c +++ b/target/microblaze/op_helper.c @@ -89,6 +89,21 @@ uint32_t helper_divs(CPUMBState *env, uint32_t ra, uint3= 2_t rb) raise_divzero(env, ESR_EC_DIVZERO, GETPC()); return 0; } + + /* + * Check for division overflows. + * + * Spec: https://docs.amd.com/r/en-US/ug984-vivado-microblaze-ref/idiv + * UG984, Chapter 5 MicroBlaze Instruction Set Architecture, idiv. + * + * If the U bit is clear, the value of rA is -1, and the value of rB is + * -2147483648 (divide overflow), the DZO bit in MSR will be set and + * the value in rD will be -2147483648, unless an exception is generat= ed. + */ + if ((int32_t)ra =3D=3D -1 && (int32_t)rb =3D=3D INT32_MIN) { + raise_divzero(env, ESR_EC_DIVZERO | ESR_ESS_DEC_OF, GETPC()); + return INT32_MIN; + } return (int32_t)rb / (int32_t)ra; } =20 --=20 2.43.0