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Tue, 27 Jan 2026 05:16:39 -0800 (PST) From: Chao Liu To: Alistair Francis , Daniel Henrique Barboza , Palmer Dabbelt , Weiwei Li , Liu Zhiwei Cc: qemu-devel@nongnu.org, qemu-riscv@nongnu.org, wangjingwei@iscas.ac.cn, hust-os-kernel-patches@googlegroups.com, Chao Liu Subject: [RFC PATCH v3 2/7] target/riscv: add sdext debug CSRs state Date: Tue, 27 Jan 2026 21:15:46 +0800 Message-ID: <2d69ba8204da7d3e6f8700f0c41b72d01c9a6d26.1769517768.git.chao.liu.zevorn@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: References: 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::642; envelope-from=chao.liu.zevorn@gmail.com; helo=mail-pl1-x642.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=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 @gmail.com) X-ZM-MESSAGEID: 1769519859745158500 Content-Type: text/plain; charset="utf-8" RISC-V Debug Specification: https://github.com/riscv/riscv-debug-spec/releases/tag/1.0 Add architectural state for Sdext Debug Mode: debug_mode, dcsr, dpc and dscratch0/1. Wire up CSR access for dcsr/dpc/dscratch and gate them to Debug Mode (or host debugger access). The Sdext is not fully implemented, so it is disabled by default. Signed-off-by: Chao Liu --- target/riscv/cpu.c | 10 +++ target/riscv/cpu.h | 4 + target/riscv/cpu_bits.h | 33 ++++++++ target/riscv/cpu_cfg_fields.h.inc | 1 + target/riscv/csr.c | 126 ++++++++++++++++++++++++++++++ target/riscv/machine.c | 20 +++++ 6 files changed, 194 insertions(+) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 0ba98a62e4..ba8fd1557a 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -209,6 +209,7 @@ const RISCVIsaExtData isa_edata_arr[] =3D { ISA_EXT_DATA_ENTRY(zvkt, PRIV_VERSION_1_12_0, ext_zvkt), ISA_EXT_DATA_ENTRY(zhinx, PRIV_VERSION_1_12_0, ext_zhinx), ISA_EXT_DATA_ENTRY(zhinxmin, PRIV_VERSION_1_12_0, ext_zhinxmin), + ISA_EXT_DATA_ENTRY(sdext, PRIV_VERSION_1_12_0, ext_sdext), ISA_EXT_DATA_ENTRY(sdtrig, PRIV_VERSION_1_12_0, ext_sdtrig), ISA_EXT_DATA_ENTRY(shcounterenw, PRIV_VERSION_1_12_0, has_priv_1_12), ISA_EXT_DATA_ENTRY(sha, PRIV_VERSION_1_12_0, ext_sha), @@ -779,6 +780,11 @@ static void riscv_cpu_reset_hold(Object *obj, ResetTyp= e type) /* Default NaN value: sign bit clear, frac msb set */ set_float_default_nan_pattern(0b01000000, &env->fp_status); env->vill =3D true; + env->debug_mode =3D false; + env->dcsr =3D DCSR_DEBUGVER(4); + env->dpc =3D 0; + env->dscratch[0] =3D 0; + env->dscratch[1] =3D 0; =20 #ifndef CONFIG_USER_ONLY if (cpu->cfg.ext_sdtrig) { @@ -1131,6 +1137,9 @@ static void riscv_cpu_init(Object *obj) */ cpu->cfg.ext_sdtrig =3D true; =20 + /* sdext is not fully implemented, so it is disabled by default. */ + cpu->cfg.ext_sdext =3D false; + if (mcc->def->profile) { mcc->def->profile->enabled =3D true; } @@ -1245,6 +1254,7 @@ const RISCVCPUMultiExtConfig riscv_cpu_extensions[] = =3D { MULTI_EXT_CFG_BOOL("smcdeleg", ext_smcdeleg, false), MULTI_EXT_CFG_BOOL("sscsrind", ext_sscsrind, false), MULTI_EXT_CFG_BOOL("ssccfg", ext_ssccfg, false), + MULTI_EXT_CFG_BOOL("sdext", ext_sdext, false), MULTI_EXT_CFG_BOOL("sdtrig", ext_sdtrig, true), MULTI_EXT_CFG_BOOL("smctr", ext_smctr, false), MULTI_EXT_CFG_BOOL("ssctr", ext_ssctr, false), diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index 5c6824f2d3..a474494dff 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -476,6 +476,10 @@ struct CPUArchState { =20 /* True if in debugger mode. */ bool debugger; + bool debug_mode; + target_ulong dcsr; + target_ulong dpc; + target_ulong dscratch[2]; =20 uint64_t mstateen[SMSTATEEN_MAX_COUNT]; uint64_t hstateen[SMSTATEEN_MAX_COUNT]; diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h index b62dd82fe7..bb59f7ff56 100644 --- a/target/riscv/cpu_bits.h +++ b/target/riscv/cpu_bits.h @@ -467,6 +467,39 @@ #define CSR_DCSR 0x7b0 #define CSR_DPC 0x7b1 #define CSR_DSCRATCH 0x7b2 +#define CSR_DSCRATCH1 0x7b3 + +/* DCSR fields */ +#define DCSR_XDEBUGVER_SHIFT 28 +#define DCSR_XDEBUGVER_MASK (0xfu << DCSR_XDEBUGVER_SHIFT) +#define DCSR_DEBUGVER(val) ((target_ulong)(val) << DCSR_XDEBUGVER_SHI= FT) +#define DCSR_EXTCAUSE_SHIFT 24 +#define DCSR_EXTCAUSE_MASK (0x7u << DCSR_EXTCAUSE_SHIFT) +#define DCSR_CETRIG BIT(19) +#define DCSR_PELP BIT(18) +#define DCSR_EBREAKVS BIT(17) +#define DCSR_EBREAKVU BIT(16) +#define DCSR_EBREAKM BIT(15) +#define DCSR_EBREAKS BIT(13) +#define DCSR_EBREAKU BIT(12) +#define DCSR_STEPIE BIT(11) +#define DCSR_STOPCOUNT BIT(10) +#define DCSR_STOPTIME BIT(9) +#define DCSR_CAUSE_SHIFT 6 +#define DCSR_CAUSE_MASK (0x7u << DCSR_CAUSE_SHIFT) +#define DCSR_V BIT(5) +#define DCSR_MPRVEN BIT(4) +#define DCSR_NMIP BIT(3) +#define DCSR_STEP BIT(2) +#define DCSR_PRV_MASK 0x3u + +#define DCSR_CAUSE_EBREAK 1 +#define DCSR_CAUSE_TRIGGER 2 +#define DCSR_CAUSE_HALTREQ 3 +#define DCSR_CAUSE_STEP 4 +#define DCSR_CAUSE_RESET 5 +#define DCSR_CAUSE_GROUP 6 +#define DCSR_CAUSE_OTHER 7 =20 /* Performance Counters */ #define CSR_MHPMCOUNTER3 0xb03 diff --git a/target/riscv/cpu_cfg_fields.h.inc b/target/riscv/cpu_cfg_field= s.h.inc index 492fdd1553..4b157ac920 100644 --- a/target/riscv/cpu_cfg_fields.h.inc +++ b/target/riscv/cpu_cfg_fields.h.inc @@ -46,6 +46,7 @@ BOOL_FIELD(ext_zilsd) BOOL_FIELD(ext_zimop) BOOL_FIELD(ext_zcmop) BOOL_FIELD(ext_ztso) +BOOL_FIELD(ext_sdext) BOOL_FIELD(ext_sdtrig) BOOL_FIELD(ext_smstateen) BOOL_FIELD(ext_sstc) diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 870fad87ac..3e38c943e0 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -3136,6 +3136,126 @@ static RISCVException write_mtval(CPURISCVState *en= v, int csrno, return RISCV_EXCP_NONE; } =20 +#if !defined(CONFIG_USER_ONLY) +static RISCVException sdext(CPURISCVState *env, int csrno) +{ + if (!riscv_cpu_cfg(env)->ext_sdext) { + return RISCV_EXCP_ILLEGAL_INST; + } + + if (!env->debug_mode && !env->debugger) { + return RISCV_EXCP_ILLEGAL_INST; + } + + return RISCV_EXCP_NONE; +} + +static target_ulong dcsr_visible_mask(CPURISCVState *env) +{ + target_ulong mask =3D (target_ulong)-1; + RISCVCPU *cpu =3D env_archcpu(env); + + if (!riscv_has_ext(env, RVH)) { + mask &=3D ~(DCSR_EBREAKVS | DCSR_EBREAKVU | DCSR_V); + } + if (!riscv_has_ext(env, RVS)) { + mask &=3D ~DCSR_EBREAKS; + } + if (!riscv_has_ext(env, RVU)) { + mask &=3D ~DCSR_EBREAKU; + } + if (!cpu->cfg.ext_zicfilp) { + mask &=3D ~DCSR_PELP; + } + if (!cpu->cfg.ext_smdbltrp) { + mask &=3D ~DCSR_CETRIG; + } + + return mask; +} + +static RISCVException read_dcsr(CPURISCVState *env, int csrno, + target_ulong *val) +{ + *val =3D env->dcsr & dcsr_visible_mask(env); + return RISCV_EXCP_NONE; +} + +static target_ulong dcsr_writable_mask(CPURISCVState *env) +{ + target_ulong mask =3D DCSR_EBREAKM | DCSR_EBREAKS | DCSR_EBREAKU | + DCSR_STEPIE | DCSR_STOPCOUNT | DCSR_STOPTIME | + DCSR_STEP | DCSR_PRV_MASK; + RISCVCPU *cpu =3D env_archcpu(env); + + mask |=3D DCSR_MPRVEN; + + if (riscv_has_ext(env, RVH)) { + mask |=3D DCSR_EBREAKVS | DCSR_EBREAKVU | DCSR_V; + } + if (riscv_has_ext(env, RVS)) { + mask |=3D DCSR_EBREAKS; + } + if (riscv_has_ext(env, RVU)) { + mask |=3D DCSR_EBREAKU; + } + if (cpu->cfg.ext_zicfilp) { + mask |=3D DCSR_PELP; + } + if (cpu->cfg.ext_smdbltrp) { + mask |=3D DCSR_CETRIG; + } + + return mask; +} + +static RISCVException write_dcsr(CPURISCVState *env, int csrno, + target_ulong val, uintptr_t ra) +{ + target_ulong mask =3D dcsr_writable_mask(env); + target_ulong new_val =3D env->dcsr; + + new_val &=3D ~mask; + new_val |=3D val & mask; + new_val &=3D ~DCSR_XDEBUGVER_MASK; + new_val |=3D DCSR_DEBUGVER(4); + env->dcsr =3D new_val; + return RISCV_EXCP_NONE; +} + +static RISCVException read_dpc(CPURISCVState *env, int csrno, + target_ulong *val) +{ + *val =3D env->dpc & get_xepc_mask(env); + return RISCV_EXCP_NONE; +} + +static RISCVException write_dpc(CPURISCVState *env, int csrno, + target_ulong val, uintptr_t ra) +{ + env->dpc =3D val & get_xepc_mask(env); + return RISCV_EXCP_NONE; +} + +static RISCVException read_dscratch(CPURISCVState *env, int csrno, + target_ulong *val) +{ + int index =3D (csrno =3D=3D CSR_DSCRATCH1) ? 1 : 0; + + *val =3D env->dscratch[index]; + return RISCV_EXCP_NONE; +} + +static RISCVException write_dscratch(CPURISCVState *env, int csrno, + target_ulong val, uintptr_t ra) +{ + int index =3D (csrno =3D=3D CSR_DSCRATCH1) ? 1 : 0; + + env->dscratch[index] =3D val; + return RISCV_EXCP_NONE; +} +#endif /* !CONFIG_USER_ONLY */ + /* Execution environment configuration setup */ static RISCVException read_menvcfg(CPURISCVState *env, int csrno, target_ulong *val) @@ -6297,6 +6417,12 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] =3D { [CSR_TDATA3] =3D { "tdata3", debug, read_tdata, write_tdata = }, [CSR_TINFO] =3D { "tinfo", debug, read_tinfo, write_ignore = }, [CSR_MCONTEXT] =3D { "mcontext", debug, read_mcontext, write_mcontex= t }, +#if !defined(CONFIG_USER_ONLY) + [CSR_DCSR] =3D { "dcsr", sdext, read_dcsr, write_dcsr }, + [CSR_DPC] =3D { "dpc", sdext, read_dpc, write_dpc }, + [CSR_DSCRATCH] =3D { "dscratch0", sdext, read_dscratch, write_dscrat= ch }, + [CSR_DSCRATCH1] =3D { "dscratch1", sdext, read_dscratch, write_dscrat= ch }, +#endif =20 [CSR_MCTRCTL] =3D { "mctrctl", ctr_mmode, NULL, NULL, rmw_xctrc= tl }, [CSR_SCTRCTL] =3D { "sctrctl", ctr_smode, NULL, NULL, rmw_xctrc= tl }, diff --git a/target/riscv/machine.c b/target/riscv/machine.c index 62c51c8033..52264cf047 100644 --- a/target/riscv/machine.c +++ b/target/riscv/machine.c @@ -248,6 +248,25 @@ static const VMStateDescription vmstate_sdtrig =3D { VMSTATE_UINTTL_ARRAY(env.tdata1, RISCVCPU, RV_MAX_TRIGGERS), VMSTATE_UINTTL_ARRAY(env.tdata2, RISCVCPU, RV_MAX_TRIGGERS), VMSTATE_UINTTL_ARRAY(env.tdata3, RISCVCPU, RV_MAX_TRIGGERS), + VMSTATE_BOOL_V(env.debug_mode, RISCVCPU, 3), + VMSTATE_UINTTL_V(env.dcsr, RISCVCPU, 3), + VMSTATE_UINTTL_V(env.dpc, RISCVCPU, 3), + VMSTATE_UINTTL_ARRAY_V(env.dscratch, RISCVCPU, 2, 3), + VMSTATE_END_OF_LIST() + } +}; + +static const VMStateDescription vmstate_sdext =3D { + .name =3D "cpu/sdext", + .version_id =3D 1, + .minimum_version_id =3D 1, + .needed =3D sdtrig_needed, + .post_load =3D sdtrig_post_load, + .fields =3D (const VMStateField[]) { + VMSTATE_BOOL_V(env.debug_mode, RISCVCPU, 3), + VMSTATE_UINTTL_V(env.dcsr, RISCVCPU, 3), + VMSTATE_UINTTL_V(env.dpc, RISCVCPU, 3), + VMSTATE_UINTTL_ARRAY_V(env.dscratch, RISCVCPU, 2, 3), VMSTATE_END_OF_LIST() } }; @@ -499,6 +518,7 @@ const VMStateDescription vmstate_riscv_cpu =3D { &vmstate_ctr, &vmstate_sstc, &vmstate_sdtrig, + &vmstate_sdext, NULL } }; --=20 2.52.0