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Tue, 22 Jul 2025 13:14:07 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFhgvBFqjglWRZ4YjWAwrRnOA+Bp1zqhdtqcB18cl6USAe8tf2ougFqjgVh66yTSdN+Eb9Cew== X-Received: by 2002:a17:903:b87:b0:235:f45f:ed2b with SMTP id d9443c01a7336-23f981619c9mr4146545ad.1.1753215247614; Tue, 22 Jul 2025 13:14:07 -0700 (PDT) From: Vacha Bhavsar To: qemu-devel@nongnu.org Cc: Peter Maydell , qemu-arm@nongnu.org, Vacha Bhavsar Subject: [PATCH v4 1/2] target/arm: Increase MAX_PACKET_LENGTH for SME ZA remote gdb debugging Date: Tue, 22 Jul 2025 20:14:03 +0000 Message-Id: <20250722201404.2368507-2-vacha.bhavsar@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250722201404.2368507-1-vacha.bhavsar@oss.qualcomm.com> References: <20250722201404.2368507-1-vacha.bhavsar@oss.qualcomm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzIyMDE3NCBTYWx0ZWRfX/4D3u2Ce2AMj /Iwh0ntsJ7EJD9nDWfI58AFys6gSOh/2OqDuyM+w7oqpVXfUPYPuYotitR5WGvenIlNKkAbjd0j W07enQoUf+0shx8814hT1kFUAFXiYM1EuOffvFEBnQaQ0K2+UcP848wrFCSqAYXSMd1gXj4b14B E4DGEL6OzbVX33exHbev+vKRhNXxFDqghD6wdPXx6vGMNz4KLTYFi4GRBEjNHxpKW9xVLVTmQPr tBA/JLhI+iBjT5vcKMsWCgG9irjWiALUBDWSqf6ovJTRm+wGo9Tri1GJlfvz/yggdJyFuAOpiIH ljwuCXP3/HWIFGl64xeaxDLQgyUtzdccANSmq3MIR63eoP/9PrCiWey+4b0+5qjbApLZApHIEAR qGWBO6zkQfG5Fi4p+Kpma/LzuGeWzpsGfStaNTzSYPa8IWDG+al5HEhAKe10hQOQUoz+dFa0 X-Proofpoint-ORIG-GUID: xdethUtIXirSNW2kfIszmPxHlf1EMn2A X-Proofpoint-GUID: xdethUtIXirSNW2kfIszmPxHlf1EMn2A X-Authority-Analysis: v=2.4 cv=IrMecK/g c=1 sm=1 tr=0 ts=687ff111 cx=c_pps a=rz3CxIlbcmazkYymdCej/Q==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=Wb1JkmetP80A:10 a=EUspDBNiAAAA:8 a=IPAH5rSrwdKhQ0QJRd4A:9 a=bFCP_H2QrGi7Okbo017w:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-07-22_02,2025-07-22_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 lowpriorityscore=0 malwarescore=0 adultscore=0 clxscore=1015 priorityscore=1501 spamscore=0 mlxscore=0 mlxlogscore=951 phishscore=0 impostorscore=0 bulkscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507220174 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=205.220.180.131; envelope-from=vacha.bhavsar@oss.qualcomm.com; helo=mx0b-0031df01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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: 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 @qualcomm.com) X-ZM-MESSAGEID: 1753215316730116600 Content-Type: text/plain; charset="utf-8" This patch increases the value of the MAX_PACKET_LEGNTH to 131100 from 4096 to allow the GDBState.line_buf to be large enough to accommodate the full contents of the SME ZA storage when the vector length is maximal. This is in preparation for a related patch that allows SME register visibility through remote GDB debugging. Signed-off-by: Vacha Bhavsar --- Changes since v3: - this patch was not present in version 3 gdbstub/internals.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gdbstub/internals.h b/gdbstub/internals.h index bf5a5c6302..b58a66c201 100644 --- a/gdbstub/internals.h +++ b/gdbstub/internals.h @@ -11,7 +11,7 @@ =20 #include "exec/cpu-common.h" =20 -#define MAX_PACKET_LENGTH 4096 +#define MAX_PACKET_LENGTH 131100 =20 /* * Shared structures and definitions --=20 2.34.1 From nobody Fri Dec 19 08:07:11 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=reject dis=none) header.from=oss.qualcomm.com ARC-Seal: i=1; a=rsa-sha256; t=1753215310; cv=none; d=zohomail.com; s=zohoarc; b=Z6D++sTZLJK58b5mDO8BKJcUDRDiZRUHqWvA6BDf2oXVkNJh5Ht1vfVUIO6Nz5IzRSMP9kOp9fRNjbTAieRSWnup88f2xNvgMo8nRhLbkuq+odG6FhWZKDmLFib6yPgMn5RwddSRN75qcUAA8ku6tP0vnThJAD3cyNm57ZP4juc= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1753215310; 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=3+z+MyEDnNCsK1+S5AnwPFJtgMlSFxjWlXpFGSpjaUY=; b=nKs+3RpLxV3qeDOI4QABYhKm04uP4Ou+9sKLaFV4b+g2zWT4AmxNOpt7rure0Qy4h/jWtTGN8LaHlSmaUTvW8+XiCAzP4VOttEdJkIhInAJV1Lg28IoF3QdW8pVAHk6ns8DA2SiSwzxJ716d3CrI2Q16v3RdxhzDOhsIPUO4h3k= 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=reject dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1753215309979628.4389757239684; Tue, 22 Jul 2025 13:15:09 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ueJNR-0001m8-8m; Tue, 22 Jul 2025 16:14:17 -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 1ueJNO-0001jW-Jm for qemu-devel@nongnu.org; Tue, 22 Jul 2025 16:14:15 -0400 Received: from mx0b-0031df01.pphosted.com ([205.220.180.131]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ueJNL-0001tX-Uk for qemu-devel@nongnu.org; Tue, 22 Jul 2025 16:14:14 -0400 Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 56MFEE04010551 for ; Tue, 22 Jul 2025 20:14:11 GMT Received: from mail-pl1-f199.google.com (mail-pl1-f199.google.com [209.85.214.199]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4826t1a41h-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 22 Jul 2025 20:14:10 +0000 (GMT) Received: by mail-pl1-f199.google.com with SMTP id d9443c01a7336-235e7550f7bso61189935ad.3 for ; Tue, 22 Jul 2025 13:14:10 -0700 (PDT) Received: from admin15.qualcomm.com (i-global254.qualcomm.com. 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.220.180.131; envelope-from=vacha.bhavsar@oss.qualcomm.com; helo=mx0b-0031df01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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 @qualcomm.com) X-ZM-MESSAGEID: 1753215310825116600 Content-Type: text/plain; charset="utf-8" The QEMU GDB stub does not expose the ZA storage SME register to GDB via the remote serial protocol, which can be a useful functionality to debug SME code. To provide this functionality in Aarch64 target, this patch registers= the SME register set with the GDB stub. To do so, this patch implements the aarch64_gdb_get_sme_reg() and aarch64_gdb_set_sme_reg() functions to specify how to get and set the SME registers, and the arm_gen_dynamic_smereg_feature() function to generate the target description in XML format to indicate the target architecture supports SME. Finally, this patch includes a dyn_smereg_feature structure to hold this GDB XML description of the SME registers for each CPU. Signed-off-by: Vacha Bhavsar --- Changes since v3: - added changes to aarch64_gdb_set_sme_reg() to address the concerns=20 brought up in review regarding endianness target/arm/cpu.h | 1 + target/arm/gdbstub.c | 6 ++ target/arm/gdbstub64.c | 122 +++++++++++++++++++++++++++++++++++++++++ target/arm/internals.h | 3 + 4 files changed, 132 insertions(+) diff --git a/target/arm/cpu.h b/target/arm/cpu.h index dc9b6dce4c..8bd66d7049 100644 --- a/target/arm/cpu.h +++ b/target/arm/cpu.h @@ -933,6 +933,7 @@ struct ArchCPU { =20 DynamicGDBFeatureInfo dyn_sysreg_feature; DynamicGDBFeatureInfo dyn_svereg_feature; + DynamicGDBFeatureInfo dyn_smereg_feature; DynamicGDBFeatureInfo dyn_m_systemreg_feature; DynamicGDBFeatureInfo dyn_m_secextreg_feature; =20 diff --git a/target/arm/gdbstub.c b/target/arm/gdbstub.c index ce4497ad7c..9c942c77cc 100644 --- a/target/arm/gdbstub.c +++ b/target/arm/gdbstub.c @@ -531,6 +531,12 @@ void arm_cpu_register_gdb_regs_for_features(ARMCPU *cp= u) GDBFeature *feature =3D arm_gen_dynamic_svereg_feature(cs, cs-= >gdb_num_regs); gdb_register_coprocessor(cs, aarch64_gdb_get_sve_reg, aarch64_gdb_set_sve_reg, feature, 0); + if (isar_feature_aa64_sme(&cpu->isar)) { + GDBFeature *sme_feature =3D arm_gen_dynamic_smereg_feature= (cs, + cs->gdb_num_regs); + gdb_register_coprocessor(cs, aarch64_gdb_get_sme_reg, + aarch64_gdb_set_sme_reg, sme_feature, 0); + } } else { gdb_register_coprocessor(cs, aarch64_gdb_get_fpu_reg, aarch64_gdb_set_fpu_reg, diff --git a/target/arm/gdbstub64.c b/target/arm/gdbstub64.c index 64ee9b3b56..3d86980bc9 100644 --- a/target/arm/gdbstub64.c +++ b/target/arm/gdbstub64.c @@ -228,6 +228,91 @@ int aarch64_gdb_set_sve_reg(CPUState *cs, uint8_t *buf= , int reg) return 0; } =20 +int aarch64_gdb_get_sme_reg(CPUState *cs, GByteArray *buf, int reg) +{ + ARMCPU *cpu =3D ARM_CPU(cs); + CPUARMState *env =3D &cpu->env; + + switch (reg) { + /* Svg register */ + case 0: + { + int vq =3D 0; + if (FIELD_EX64(env->svcr, SVCR, SM)) { + vq =3D sve_vqm1_for_el_sm(env, arm_current_el(env), + FIELD_EX64(env->svcr, SVCR, SM)) + 1; + } + /* svg =3D vector granules (2 * vector quardwords) in streaming mo= de */ + return gdb_get_reg64(buf, vq * 2); + } + case 1: + return gdb_get_reg64(buf, env->svcr); + case 2: + { + int len =3D 0; + int vq =3D cpu->sme_max_vq; + int svl =3D vq * 16; + for (int i =3D 0; i < svl; i++) { + for (int q =3D 0; q < vq; q++) { + len +=3D gdb_get_reg128(buf, + env->za_state.za[i].d[q * 2 + 1], + env->za_state.za[i].d[q * 2]); + } + } + return len; + } + default: + /* gdbstub asked for something out of range */ + qemu_log_mask(LOG_UNIMP, "%s: out of range register %d", __func__,= reg); + break; + } + + return 0; +} + +int aarch64_gdb_set_sme_reg(CPUState *cs, uint8_t *buf, int reg) +{ + ARMCPU *cpu =3D ARM_CPU(cs); + CPUARMState *env =3D &cpu->env; + + switch (reg) { + case 0: + { + /* cannot set svg via gdbstub */ + return 8; + } + case 1: + aarch64_set_svcr(env, ldq_le_p(buf), + R_SVCR_SM_MASK | R_SVCR_ZA_MASK); + return 8; + case 2: + int len =3D 0; + int vq =3D cpu->sme_max_vq; + int svl =3D vq * 16; + for (int i =3D 0; i < svl; i++) { + for (int q =3D 0; q < vq; q++) { + if (target_big_endian()){ + env->za_state.za[i].d[q * 2 + 1] =3D ldq_p(buf); + buf +=3D 8; + env->za_state.za[i].d[q * 2] =3D ldq_p(buf); + } else{ + env->za_state.za[i].d[q * 2] =3D ldq_p(buf); + buf +=3D 8; + env->za_state.za[i].d[q * 2 + 1] =3D ldq_p(buf); + } + buf +=3D 8; + len +=3D 16; + } + } + return len; + default: + /* gdbstub asked for something out of range */ + break; + } + + return 0; +} + int aarch64_gdb_get_pauth_reg(CPUState *cs, GByteArray *buf, int reg) { ARMCPU *cpu =3D ARM_CPU(cs); @@ -392,6 +477,43 @@ GDBFeature *arm_gen_dynamic_svereg_feature(CPUState *c= s, int base_reg) return &cpu->dyn_svereg_feature.desc; } =20 +GDBFeature *arm_gen_dynamic_smereg_feature(CPUState *cs, int base_reg) +{ + ARMCPU *cpu =3D ARM_CPU(cs); + int vq =3D cpu->sme_max_vq; + int svl =3D vq * 16; + GDBFeatureBuilder builder; + int reg =3D 0; + + gdb_feature_builder_init(&builder, &cpu->dyn_smereg_feature.desc, + "org.gnu.gdb.aarch64.sme", "sme-registers.xml", base_reg); + + + /* Create the sme_bv vector type. */ + gdb_feature_builder_append_tag(&builder, + "", + svl); + + /* Create the sme_bvv vector type. */ + gdb_feature_builder_append_tag( + &builder, "", + svl); + + /* Define the svg, svcr, and za registers. */ + + /* fpscr & status registers */ + gdb_feature_builder_append_reg(&builder, "svg", 64, reg++, + "int", NULL); + gdb_feature_builder_append_reg(&builder, "svcr", 64, reg++, + "int", NULL); + gdb_feature_builder_append_reg(&builder, "za", svl * svl * 8, reg++, + "sme_bvv", NULL); + + gdb_feature_builder_end(&builder); + + return &cpu->dyn_smereg_feature.desc; +} + #ifdef CONFIG_USER_ONLY int aarch64_gdb_get_tag_ctl_reg(CPUState *cs, GByteArray *buf, int reg) { diff --git a/target/arm/internals.h b/target/arm/internals.h index c4765e4489..760e1c6490 100644 --- a/target/arm/internals.h +++ b/target/arm/internals.h @@ -1808,8 +1808,11 @@ static inline uint64_t pmu_counter_mask(CPUARMState = *env) } =20 GDBFeature *arm_gen_dynamic_svereg_feature(CPUState *cpu, int base_reg); +GDBFeature *arm_gen_dynamic_smereg_feature(CPUState *cpu, int base_reg); int aarch64_gdb_get_sve_reg(CPUState *cs, GByteArray *buf, int reg); int aarch64_gdb_set_sve_reg(CPUState *cs, uint8_t *buf, int reg); +int aarch64_gdb_get_sme_reg(CPUState *cs, GByteArray *buf, int reg); +int aarch64_gdb_set_sme_reg(CPUState *cs, uint8_t *buf, int reg); int aarch64_gdb_get_fpu_reg(CPUState *cs, GByteArray *buf, int reg); int aarch64_gdb_set_fpu_reg(CPUState *cs, uint8_t *buf, int reg); int aarch64_gdb_get_pauth_reg(CPUState *cs, GByteArray *buf, int reg); --=20 2.34.1