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Thu, 25 Jul 2024 16:46:26 -0700 (PDT) From: Deepak Gupta To: qemu-riscv@nongnu.org, qemu-devel@nongnu.org, jim.shu@sifive.com, andy.chiu@sifive.com, jesse.huang@sifive.com, kito.cheng@sifive.com Cc: palmer@dabbelt.com, Alistair.Francis@wdc.com, laurent@vivier.eu, bmeng.cn@gmail.com, liwei1518@gmail.com, dbarboza@ventanamicro.com, zhiwei_liu@linux.alibaba.com, Deepak Gupta Subject: [PATCH 02/24] target/riscv: Introduce elp state and enabling controls for zicfilp Date: Thu, 25 Jul 2024 16:45:51 -0700 Message-ID: <20240725234614.3850142-3-debug@rivosinc.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240725234614.3850142-1-debug@rivosinc.com> References: <20240725234614.3850142-1-debug@rivosinc.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=2607:f8b0:4864:20::231; envelope-from=debug@rivosinc.com; helo=mail-oi1-x231.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-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: 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 @rivosinc-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1721951256329116600 Content-Type: text/plain; charset="utf-8" zicfilp introduces a new state elp ("expected landing pad") in cpu. During normal execution, elp is idle (NO_LP_EXPECTED) i.e not expecting landing pad. On an indirect call, elp moves LP_EXPECTED. When elp is LP_EXPECTED, only a subsquent landing pad instruction can set state back to NO_LP_EXPECTED. On reset, elp is set to NO_LP_EXPECTED. zicfilp is enabled via bit2 in *envcfg CSRs. Enabling control for M-mode is in mseccfg CSR at bit position 10. On trap, elp state is saved away in *status. Signed-off-by: Deepak Gupta Co-developed-by: Jim Shu Co-developed-by: Andy Chiu --- target/riscv/cpu.c | 3 +++ target/riscv/cpu.h | 2 ++ target/riscv/cpu_bits.h | 12 ++++++++++++ target/riscv/csr.c | 31 +++++++++++++++++++++++++++++++ target/riscv/pmp.c | 5 +++++ target/riscv/pmp.h | 3 ++- 6 files changed, 55 insertions(+), 1 deletion(-) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 5dfb3f39ab..82fa85a8d6 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -994,6 +994,9 @@ static void riscv_cpu_reset_hold(Object *obj, ResetType= type) /* mmte is supposed to have pm.current hardwired to 1 */ env->mmte |=3D (EXT_STATUS_INITIAL | MMTE_M_PM_CURRENT); =20 + /* on reset elp is set to NO_LP_EXPECTED */ + env->elp =3D NO_LP_EXPECTED; + /* * Bits 10, 6, 2 and 12 of mideleg are read only 1 when the Hypervisor * extension is enabled. diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index 87742047ce..ae436a3179 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -222,6 +222,8 @@ struct CPUArchState { =20 target_ulong jvt; =20 + /* elp state for zicfilp extension */ + cfi_elp elp; #ifdef CONFIG_USER_ONLY uint32_t elf_flags; #endif diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h index c257c5ed7d..127f2179dc 100644 --- a/target/riscv/cpu_bits.h +++ b/target/riscv/cpu_bits.h @@ -545,6 +545,8 @@ #define MSTATUS_TVM 0x00100000 /* since: priv-1.10 */ #define MSTATUS_TW 0x00200000 /* since: priv-1.10 */ #define MSTATUS_TSR 0x00400000 /* since: priv-1.10 */ +#define MSTATUS_SPELP 0x00800000 /* zicfilp */ +#define MSTATUS_MPELP 0x020000000000 /* zicfilp */ #define MSTATUS_GVA 0x4000000000ULL #define MSTATUS_MPV 0x8000000000ULL =20 @@ -575,12 +577,19 @@ typedef enum { #define SSTATUS_XS 0x00018000 #define SSTATUS_SUM 0x00040000 /* since: priv-1.10 */ #define SSTATUS_MXR 0x00080000 +#define SSTATUS_SPELP MSTATUS_SPELP /* zicfilp */ =20 #define SSTATUS64_UXL 0x0000000300000000ULL =20 #define SSTATUS32_SD 0x80000000 #define SSTATUS64_SD 0x8000000000000000ULL =20 +/* enum for branch tracking state in cpu/hart */ +typedef enum { + NO_LP_EXPECTED =3D 0, + LP_EXPECTED =3D 1, +} cfi_elp; + /* hstatus CSR bits */ #define HSTATUS_VSBE 0x00000020 #define HSTATUS_GVA 0x00000040 @@ -747,6 +756,7 @@ typedef enum RISCVException { =20 /* Execution environment configuration bits */ #define MENVCFG_FIOM BIT(0) +#define MENVCFG_LPE BIT(2) /* zicfilp */ #define MENVCFG_CBIE (3UL << 4) #define MENVCFG_CBCFE BIT(6) #define MENVCFG_CBZE BIT(7) @@ -760,11 +770,13 @@ typedef enum RISCVException { #define MENVCFGH_STCE BIT(31) =20 #define SENVCFG_FIOM MENVCFG_FIOM +#define SENVCFG_LPE MENVCFG_LPE #define SENVCFG_CBIE MENVCFG_CBIE #define SENVCFG_CBCFE MENVCFG_CBCFE #define SENVCFG_CBZE MENVCFG_CBZE =20 #define HENVCFG_FIOM MENVCFG_FIOM +#define HENVCFG_LPE MENVCFG_LPE #define HENVCFG_CBIE MENVCFG_CBIE #define HENVCFG_CBCFE MENVCFG_CBCFE #define HENVCFG_CBZE MENVCFG_CBZE diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 432c59dc66..5771a14848 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -1400,6 +1400,11 @@ static RISCVException write_mstatus(CPURISCVState *e= nv, int csrno, } } =20 + /* If cfi lp extension is available, then apply cfi lp mask */ + if (env_archcpu(env)->cfg.ext_zicfilp) { + mask |=3D (MSTATUS_MPELP | MSTATUS_SPELP); + } + mstatus =3D (mstatus & ~mask) | (val & mask); =20 env->mstatus =3D mstatus; @@ -2101,6 +2106,10 @@ static RISCVException write_menvcfg(CPURISCVState *e= nv, int csrno, mask |=3D (cfg->ext_svpbmt ? MENVCFG_PBMTE : 0) | (cfg->ext_sstc ? MENVCFG_STCE : 0) | (cfg->ext_svadu ? MENVCFG_ADUE : 0); + + if (env_archcpu(env)->cfg.ext_zicfilp) { + mask |=3D MENVCFG_LPE; + } } env->menvcfg =3D (env->menvcfg & ~mask) | (val & mask); =20 @@ -2153,6 +2162,10 @@ static RISCVException write_senvcfg(CPURISCVState *e= nv, int csrno, return ret; } =20 + if (env_archcpu(env)->cfg.ext_zicfilp) { + mask |=3D SENVCFG_LPE; + } + env->senvcfg =3D (env->senvcfg & ~mask) | (val & mask); return RISCV_EXCP_NONE; } @@ -2190,6 +2203,10 @@ static RISCVException write_henvcfg(CPURISCVState *e= nv, int csrno, =20 if (riscv_cpu_mxl(env) =3D=3D MXL_RV64) { mask |=3D env->menvcfg & (HENVCFG_PBMTE | HENVCFG_STCE | HENVCFG_A= DUE); + + if (env_archcpu(env)->cfg.ext_zicfilp) { + mask |=3D HENVCFG_LPE; + } } =20 env->henvcfg =3D (env->henvcfg & ~mask) | (val & mask); @@ -2654,6 +2671,10 @@ static RISCVException read_sstatus_i128(CPURISCVStat= e *env, int csrno, mask |=3D SSTATUS64_UXL; } =20 + if (env_archcpu(env)->cfg.ext_zicfilp) { + mask |=3D SSTATUS_SPELP; + } + *val =3D int128_make128(sstatus, add_status_sd(MXL_RV128, sstatus)); return RISCV_EXCP_NONE; } @@ -2665,6 +2686,11 @@ static RISCVException read_sstatus(CPURISCVState *en= v, int csrno, if (env->xl !=3D MXL_RV32 || env->debugger) { mask |=3D SSTATUS64_UXL; } + + if (env_archcpu(env)->cfg.ext_zicfilp) { + mask |=3D SSTATUS_SPELP; + } + /* TODO: Use SXL not MXL. */ *val =3D add_status_sd(riscv_cpu_mxl(env), env->mstatus & mask); return RISCV_EXCP_NONE; @@ -2680,6 +2706,11 @@ static RISCVException write_sstatus(CPURISCVState *e= nv, int csrno, mask |=3D SSTATUS64_UXL; } } + + if (env_archcpu(env)->cfg.ext_zicfilp) { + mask |=3D SSTATUS_SPELP; + } + target_ulong newval =3D (env->mstatus & ~mask) | (val & mask); return write_mstatus(env, CSR_MSTATUS, newval); } diff --git a/target/riscv/pmp.c b/target/riscv/pmp.c index 9eea397e72..1111d08d08 100644 --- a/target/riscv/pmp.c +++ b/target/riscv/pmp.c @@ -598,6 +598,11 @@ void mseccfg_csr_write(CPURISCVState *env, target_ulon= g val) val &=3D ~(MSECCFG_MMWP | MSECCFG_MML | MSECCFG_RLB); } =20 + /* M-mode forward cfi to be enabled if cfi extension is implemented */ + if (env_archcpu(env)->cfg.ext_zicfilp) { + val |=3D (val & MSECCFG_MLPE); + } + env->mseccfg =3D val; } =20 diff --git a/target/riscv/pmp.h b/target/riscv/pmp.h index f5c10ce85c..e0530a17a3 100644 --- a/target/riscv/pmp.h +++ b/target/riscv/pmp.h @@ -44,7 +44,8 @@ typedef enum { MSECCFG_MMWP =3D 1 << 1, MSECCFG_RLB =3D 1 << 2, MSECCFG_USEED =3D 1 << 8, - MSECCFG_SSEED =3D 1 << 9 + MSECCFG_SSEED =3D 1 << 9, + MSECCFG_MLPE =3D 1 << 10, } mseccfg_field_t; =20 typedef struct { --=20 2.44.0