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Fri, 22 Oct 2021 06:39:39 -0700 (PDT) Received: from toolbox.wdc.com (unknown [10.225.165.39]) by usg-ed-osssrv.wdc.com (Postfix) with ESMTPSA id 4HbQSR59jpz1RtVl; Fri, 22 Oct 2021 06:39:35 -0700 (PDT) From: Alistair Francis To: qemu-devel@nongnu.org Cc: alistair23@gmail.com, Richard Henderson , LIU Zhiwei , Alistair Francis Subject: [PULL 12/33] target/riscv: Add MXL/SXL/UXL to TB_FLAGS Date: Fri, 22 Oct 2021 23:37:51 +1000 Message-Id: <20211022133812.3972903-13-alistair.francis@opensource.wdc.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211022133812.3972903-1-alistair.francis@opensource.wdc.com> References: <20211022133812.3972903-1-alistair.francis@opensource.wdc.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=216.71.153.144; envelope-from=prvs=9222bbd82=alistair.francis@opensource.wdc.com; helo=esa5.hgst.iphmx.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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_MED=-2.3, SPF_HELO_PASS=-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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Richard Henderson Begin adding support for switching XLEN at runtime. Extract the effective XLEN from MISA and MSTATUS and store for use during translation= . Reviewed-by: LIU Zhiwei Reviewed-by: Alistair Francis Signed-off-by: Richard Henderson Message-id: 20211020031709.359469-6-richard.henderson@linaro.org Signed-off-by: Alistair Francis --- target/riscv/cpu.h | 2 ++ target/riscv/cpu.c | 8 ++++++++ target/riscv/cpu_helper.c | 33 +++++++++++++++++++++++++++++++++ target/riscv/csr.c | 3 +++ target/riscv/translate.c | 2 +- 5 files changed, 47 insertions(+), 1 deletion(-) diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index e23157b05c..a33dc30be8 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -395,6 +395,8 @@ FIELD(TB_FLAGS, VILL, 9, 1) /* Is a Hypervisor instruction load/store allowed? */ FIELD(TB_FLAGS, HLSX, 10, 1) FIELD(TB_FLAGS, MSTATUS_HS_FS, 11, 2) +/* The combination of MXL/SXL/UXL that applies to the current cpu mode. = */ +FIELD(TB_FLAGS, XL, 13, 2) =20 #ifdef TARGET_RISCV32 #define riscv_cpu_mxl(env) ((void)(env), MXL_RV32) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 3d144af1ab..dd9eccd68e 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -355,6 +355,14 @@ static void riscv_cpu_reset(DeviceState *dev) env->misa_mxl =3D env->misa_mxl_max; env->priv =3D PRV_M; env->mstatus &=3D ~(MSTATUS_MIE | MSTATUS_MPRV); + if (env->misa_mxl > MXL_RV32) { + /* + * The reset status of SXL/UXL is undefined, but mstatus is WARL + * and we must ensure that the value after init is valid for rea= d. + */ + env->mstatus =3D set_field(env->mstatus, MSTATUS64_SXL, env->mis= a_mxl); + env->mstatus =3D set_field(env->mstatus, MSTATUS64_UXL, env->mis= a_mxl); + } env->mcause =3D 0; env->pc =3D env->resetvec; env->two_stage_lookup =3D false; diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c index 403f54171d..429afd1f48 100644 --- a/target/riscv/cpu_helper.c +++ b/target/riscv/cpu_helper.c @@ -35,6 +35,37 @@ int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetc= h) #endif } =20 +static RISCVMXL cpu_get_xl(CPURISCVState *env) +{ +#if defined(TARGET_RISCV32) + return MXL_RV32; +#elif defined(CONFIG_USER_ONLY) + return MXL_RV64; +#else + RISCVMXL xl =3D riscv_cpu_mxl(env); + + /* + * When emulating a 32-bit-only cpu, use RV32. + * When emulating a 64-bit cpu, and MXL has been reduced to RV32, + * MSTATUSH doesn't have UXL/SXL, therefore XLEN cannot be widened + * back to RV64 for lower privs. + */ + if (xl !=3D MXL_RV32) { + switch (env->priv) { + case PRV_M: + break; + case PRV_U: + xl =3D get_field(env->mstatus, MSTATUS64_UXL); + break; + default: /* PRV_S | PRV_H */ + xl =3D get_field(env->mstatus, MSTATUS64_SXL); + break; + } + } + return xl; +#endif +} + void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc, target_ulong *cs_base, uint32_t *pflags) { @@ -78,6 +109,8 @@ void cpu_get_tb_cpu_state(CPURISCVState *env, target_u= long *pc, } #endif =20 + flags =3D FIELD_DP32(flags, TB_FLAGS, XL, cpu_get_xl(env)); + *pflags =3D flags; } =20 diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 9c0753bc8b..c4a479ddd2 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -526,6 +526,9 @@ static RISCVException write_mstatus(CPURISCVState *en= v, int csrno, mstatus =3D set_field(mstatus, MSTATUS32_SD, dirty); } else { mstatus =3D set_field(mstatus, MSTATUS64_SD, dirty); + /* SXL and UXL fields are for now read only */ + mstatus =3D set_field(mstatus, MSTATUS64_SXL, MXL_RV64); + mstatus =3D set_field(mstatus, MSTATUS64_UXL, MXL_RV64); } env->mstatus =3D mstatus; =20 diff --git a/target/riscv/translate.c b/target/riscv/translate.c index 0aa2122529..77cad9bc45 100644 --- a/target/riscv/translate.c +++ b/target/riscv/translate.c @@ -514,7 +514,6 @@ static void riscv_tr_init_disas_context(DisasContextB= ase *dcbase, CPUState *cs) #else ctx->virt_enabled =3D false; #endif - ctx->xl =3D env->misa_mxl; ctx->misa_ext =3D env->misa_ext; ctx->frm =3D -1; /* unknown rounding mode */ ctx->ext_ifencei =3D cpu->cfg.ext_ifencei; @@ -526,6 +525,7 @@ static void riscv_tr_init_disas_context(DisasContextB= ase *dcbase, CPUState *cs) ctx->lmul =3D FIELD_EX32(tb_flags, TB_FLAGS, LMUL); ctx->mlen =3D 1 << (ctx->sew + 3 - ctx->lmul); ctx->vl_eq_vlmax =3D FIELD_EX32(tb_flags, TB_FLAGS, VL_EQ_VLMAX); + ctx->xl =3D FIELD_EX32(tb_flags, TB_FLAGS, XL); ctx->cs =3D cs; ctx->w =3D false; ctx->ntemp =3D 0; --=20 2.31.1