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Mon, 03 Jul 2023 11:33:21 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Palmer Dabbelt , Paolo Bonzini , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Thomas Huth , Beraldo Leal , Wainer dos Santos Moschetta , Alistair Francis , Daniel Henrique Barboza , kvm@vger.kernel.org, qemu-riscv@nongnu.org, Bin Meng , =?utf-8?q?Alex_Be?= =?utf-8?q?nn=C3=A9e?= , Weiwei Li , Liu Zhiwei Subject: [PATCH v2 14/16] target/riscv: Move sysemu-specific code to sysemu/cpu_helper.c Date: Mon, 3 Jul 2023 20:31:43 +0200 Message-Id: <20230703183145.24779-15-philmd@linaro.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230703183145.24779-1-philmd@linaro.org> References: <20230703183145.24779-1-philmd@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::329; envelope-from=philmd@linaro.org; helo=mail-wm1-x329.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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org Signed-off-by: Philippe Mathieu-Daudé --- target/riscv/cpu_helper.c | 858 +----------------------------- target/riscv/sysemu/cpu_helper.c | 863 +++++++++++++++++++++++++++++++ target/riscv/sysemu/meson.build | 1 + 3 files changed, 865 insertions(+), 857 deletions(-) create mode 100644 target/riscv/sysemu/cpu_helper.c diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c index f1d0cd1e64..900e3c2b5c 100644 --- a/target/riscv/cpu_helper.c +++ b/target/riscv/cpu_helper.c @@ -18,22 +18,12 @@ */ #include "qemu/osdep.h" -#include "qemu/log.h" -#include "qemu/main-loop.h" #include "cpu.h" #include "internals.h" -#include "sysemu/pmu.h" -#include "exec/exec-all.h" -#include "sysemu/instmap.h" -#include "tcg/tcg-op.h" -#include "trace.h" -#include "semihosting/common-semi.h" #ifndef CONFIG_USER_ONLY #include "sysemu/cpu-timers.h" #endif -#include "cpu_bits.h" -#include "sysemu/debug.h" -#include "tcg/oversized-guest.h" + int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch) { @@ -108,849 +98,3 @@ void riscv_cpu_update_mask(CPURISCVState *env) env->cur_pmbase = base; } } - -#ifndef CONFIG_USER_ONLY - -/* - * The HS-mode is allowed to configure priority only for the - * following VS-mode local interrupts: - * - * 0 (Reserved interrupt, reads as zero) - * 1 Supervisor software interrupt - * 4 (Reserved interrupt, reads as zero) - * 5 Supervisor timer interrupt - * 8 (Reserved interrupt, reads as zero) - * 13 (Reserved interrupt) - * 14 " - * 15 " - * 16 " - * 17 " - * 18 " - * 19 " - * 20 " - * 21 " - * 22 " - * 23 " - */ - -static const int hviprio_index2irq[] = { - 0, 1, 4, 5, 8, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 }; -static const int hviprio_index2rdzero[] = { - 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; - -int riscv_cpu_hviprio_index2irq(int index, int *out_irq, int *out_rdzero) -{ - if (index < 0 || ARRAY_SIZE(hviprio_index2irq) <= index) { - return -EINVAL; - } - - if (out_irq) { - *out_irq = hviprio_index2irq[index]; - } - - if (out_rdzero) { - *out_rdzero = hviprio_index2rdzero[index]; - } - - return 0; -} - -/* - * Default priorities of local interrupts are defined in the - * RISC-V Advanced Interrupt Architecture specification. - * - * ---------------------------------------------------------------- - * Default | - * Priority | Major Interrupt Numbers - * ---------------------------------------------------------------- - * Highest | 47, 23, 46, 45, 22, 44, - * | 43, 21, 42, 41, 20, 40 - * | - * | 11 (0b), 3 (03), 7 (07) - * | 9 (09), 1 (01), 5 (05) - * | 12 (0c) - * | 10 (0a), 2 (02), 6 (06) - * | - * | 39, 19, 38, 37, 18, 36, - * Lowest | 35, 17, 34, 33, 16, 32 - * ---------------------------------------------------------------- - */ -static const uint8_t default_iprio[64] = { - /* Custom interrupts 48 to 63 */ - [63] = IPRIO_MMAXIPRIO, - [62] = IPRIO_MMAXIPRIO, - [61] = IPRIO_MMAXIPRIO, - [60] = IPRIO_MMAXIPRIO, - [59] = IPRIO_MMAXIPRIO, - [58] = IPRIO_MMAXIPRIO, - [57] = IPRIO_MMAXIPRIO, - [56] = IPRIO_MMAXIPRIO, - [55] = IPRIO_MMAXIPRIO, - [54] = IPRIO_MMAXIPRIO, - [53] = IPRIO_MMAXIPRIO, - [52] = IPRIO_MMAXIPRIO, - [51] = IPRIO_MMAXIPRIO, - [50] = IPRIO_MMAXIPRIO, - [49] = IPRIO_MMAXIPRIO, - [48] = IPRIO_MMAXIPRIO, - - /* Custom interrupts 24 to 31 */ - [31] = IPRIO_MMAXIPRIO, - [30] = IPRIO_MMAXIPRIO, - [29] = IPRIO_MMAXIPRIO, - [28] = IPRIO_MMAXIPRIO, - [27] = IPRIO_MMAXIPRIO, - [26] = IPRIO_MMAXIPRIO, - [25] = IPRIO_MMAXIPRIO, - [24] = IPRIO_MMAXIPRIO, - - [47] = IPRIO_DEFAULT_UPPER, - [23] = IPRIO_DEFAULT_UPPER + 1, - [46] = IPRIO_DEFAULT_UPPER + 2, - [45] = IPRIO_DEFAULT_UPPER + 3, - [22] = IPRIO_DEFAULT_UPPER + 4, - [44] = IPRIO_DEFAULT_UPPER + 5, - - [43] = IPRIO_DEFAULT_UPPER + 6, - [21] = IPRIO_DEFAULT_UPPER + 7, - [42] = IPRIO_DEFAULT_UPPER + 8, - [41] = IPRIO_DEFAULT_UPPER + 9, - [20] = IPRIO_DEFAULT_UPPER + 10, - [40] = IPRIO_DEFAULT_UPPER + 11, - - [11] = IPRIO_DEFAULT_M, - [3] = IPRIO_DEFAULT_M + 1, - [7] = IPRIO_DEFAULT_M + 2, - - [9] = IPRIO_DEFAULT_S, - [1] = IPRIO_DEFAULT_S + 1, - [5] = IPRIO_DEFAULT_S + 2, - - [12] = IPRIO_DEFAULT_SGEXT, - - [10] = IPRIO_DEFAULT_VS, - [2] = IPRIO_DEFAULT_VS + 1, - [6] = IPRIO_DEFAULT_VS + 2, - - [39] = IPRIO_DEFAULT_LOWER, - [19] = IPRIO_DEFAULT_LOWER + 1, - [38] = IPRIO_DEFAULT_LOWER + 2, - [37] = IPRIO_DEFAULT_LOWER + 3, - [18] = IPRIO_DEFAULT_LOWER + 4, - [36] = IPRIO_DEFAULT_LOWER + 5, - - [35] = IPRIO_DEFAULT_LOWER + 6, - [17] = IPRIO_DEFAULT_LOWER + 7, - [34] = IPRIO_DEFAULT_LOWER + 8, - [33] = IPRIO_DEFAULT_LOWER + 9, - [16] = IPRIO_DEFAULT_LOWER + 10, - [32] = IPRIO_DEFAULT_LOWER + 11, -}; - -uint8_t riscv_cpu_default_priority(int irq) -{ - if (irq < 0 || irq > 63) { - return IPRIO_MMAXIPRIO; - } - - return default_iprio[irq] ? default_iprio[irq] : IPRIO_MMAXIPRIO; -}; - -int riscv_cpu_pending_to_irq(CPURISCVState *env, - int extirq, unsigned int extirq_def_prio, - uint64_t pending, uint8_t *iprio) -{ - int irq, best_irq = RISCV_EXCP_NONE; - unsigned int prio, best_prio = UINT_MAX; - - if (!pending) { - return RISCV_EXCP_NONE; - } - - irq = ctz64(pending); - if (!((extirq == IRQ_M_EXT) ? riscv_cpu_cfg(env)->ext_smaia : - riscv_cpu_cfg(env)->ext_ssaia)) { - return irq; - } - - pending = pending >> irq; - while (pending) { - prio = iprio[irq]; - if (!prio) { - if (irq == extirq) { - prio = extirq_def_prio; - } else { - prio = (riscv_cpu_default_priority(irq) < extirq_def_prio) ? - 1 : IPRIO_MMAXIPRIO; - } - } - if ((pending & 0x1) && (prio <= best_prio)) { - best_irq = irq; - best_prio = prio; - } - irq++; - pending = pending >> 1; - } - - return best_irq; -} - -uint64_t riscv_cpu_all_pending(CPURISCVState *env) -{ - uint32_t gein = get_field(env->hstatus, HSTATUS_VGEIN); - uint64_t vsgein = (env->hgeip & (1ULL << gein)) ? MIP_VSEIP : 0; - uint64_t vstip = (env->vstime_irq) ? MIP_VSTIP : 0; - - return (env->mip | vsgein | vstip) & env->mie; -} - -int riscv_cpu_mirq_pending(CPURISCVState *env) -{ - uint64_t irqs = riscv_cpu_all_pending(env) & ~env->mideleg & - ~(MIP_SGEIP | MIP_VSSIP | MIP_VSTIP | MIP_VSEIP); - - return riscv_cpu_pending_to_irq(env, IRQ_M_EXT, IPRIO_DEFAULT_M, - irqs, env->miprio); -} - -int riscv_cpu_sirq_pending(CPURISCVState *env) -{ - uint64_t irqs = riscv_cpu_all_pending(env) & env->mideleg & - ~(MIP_VSSIP | MIP_VSTIP | MIP_VSEIP); - - return riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, - irqs, env->siprio); -} - -int riscv_cpu_vsirq_pending(CPURISCVState *env) -{ - uint64_t irqs = riscv_cpu_all_pending(env) & env->mideleg & - (MIP_VSSIP | MIP_VSTIP | MIP_VSEIP); - - return riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, - irqs >> 1, env->hviprio); -} - -/* Return true is floating point support is currently enabled */ -bool riscv_cpu_fp_enabled(CPURISCVState *env) -{ - if (env->mstatus & MSTATUS_FS) { - if (env->virt_enabled && !(env->mstatus_hs & MSTATUS_FS)) { - return false; - } - return true; - } - - return false; -} - -/* Return true is vector support is currently enabled */ -bool riscv_cpu_vector_enabled(CPURISCVState *env) -{ - if (env->mstatus & MSTATUS_VS) { - if (env->virt_enabled && !(env->mstatus_hs & MSTATUS_VS)) { - return false; - } - return true; - } - - return false; -} - -void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env) -{ - uint64_t mstatus_mask = MSTATUS_MXR | MSTATUS_SUM | - MSTATUS_SPP | MSTATUS_SPIE | MSTATUS_SIE | - MSTATUS64_UXL | MSTATUS_VS; - - if (riscv_has_ext(env, RVF)) { - mstatus_mask |= MSTATUS_FS; - } - bool current_virt = env->virt_enabled; - - g_assert(riscv_has_ext(env, RVH)); - - if (current_virt) { - /* Current V=1 and we are about to change to V=0 */ - env->vsstatus = env->mstatus & mstatus_mask; - env->mstatus &= ~mstatus_mask; - env->mstatus |= env->mstatus_hs; - - env->vstvec = env->stvec; - env->stvec = env->stvec_hs; - - env->vsscratch = env->sscratch; - env->sscratch = env->sscratch_hs; - - env->vsepc = env->sepc; - env->sepc = env->sepc_hs; - - env->vscause = env->scause; - env->scause = env->scause_hs; - - env->vstval = env->stval; - env->stval = env->stval_hs; - - env->vsatp = env->satp; - env->satp = env->satp_hs; - } else { - /* Current V=0 and we are about to change to V=1 */ - env->mstatus_hs = env->mstatus & mstatus_mask; - env->mstatus &= ~mstatus_mask; - env->mstatus |= env->vsstatus; - - env->stvec_hs = env->stvec; - env->stvec = env->vstvec; - - env->sscratch_hs = env->sscratch; - env->sscratch = env->vsscratch; - - env->sepc_hs = env->sepc; - env->sepc = env->vsepc; - - env->scause_hs = env->scause; - env->scause = env->vscause; - - env->stval_hs = env->stval; - env->stval = env->vstval; - - env->satp_hs = env->satp; - env->satp = env->vsatp; - } -} - -target_ulong riscv_cpu_get_geilen(CPURISCVState *env) -{ - if (!riscv_has_ext(env, RVH)) { - return 0; - } - - return env->geilen; -} - -void riscv_cpu_set_geilen(CPURISCVState *env, target_ulong geilen) -{ - if (!riscv_has_ext(env, RVH)) { - return; - } - - if (geilen > (TARGET_LONG_BITS - 1)) { - return; - } - - env->geilen = geilen; -} - -/* This function can only be called to set virt when RVH is enabled */ -void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable) -{ - /* Flush the TLB on all virt mode changes. */ - if (env->virt_enabled != enable) { - tlb_flush(env_cpu(env)); - } - - env->virt_enabled = enable; - - if (enable) { - /* - * The guest external interrupts from an interrupt controller are - * delivered only when the Guest/VM is running (i.e. V=1). This means - * any guest external interrupt which is triggered while the Guest/VM - * is not running (i.e. V=0) will be missed on QEMU resulting in guest - * with sluggish response to serial console input and other I/O events. - * - * To solve this, we check and inject interrupt after setting V=1. - */ - riscv_cpu_update_mip(env, 0, 0); - } -} - -int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint64_t interrupts) -{ - CPURISCVState *env = &cpu->env; - if (env->miclaim & interrupts) { - return -1; - } else { - env->miclaim |= interrupts; - return 0; - } -} - -uint64_t riscv_cpu_update_mip(CPURISCVState *env, uint64_t mask, - uint64_t value) -{ - CPUState *cs = env_cpu(env); - uint64_t gein, vsgein = 0, vstip = 0, old = env->mip; - - if (env->virt_enabled) { - gein = get_field(env->hstatus, HSTATUS_VGEIN); - vsgein = (env->hgeip & (1ULL << gein)) ? MIP_VSEIP : 0; - } - - vstip = env->vstime_irq ? MIP_VSTIP : 0; - - QEMU_IOTHREAD_LOCK_GUARD(); - - env->mip = (env->mip & ~mask) | (value & mask); - - if (env->mip | vsgein | vstip) { - cpu_interrupt(cs, CPU_INTERRUPT_HARD); - } else { - cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); - } - - return old; -} - -void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(void *), - void *arg) -{ - env->rdtime_fn = fn; - env->rdtime_fn_arg = arg; -} - -void riscv_cpu_set_aia_ireg_rmw_fn(CPURISCVState *env, uint32_t priv, - int (*rmw_fn)(void *arg, - target_ulong reg, - target_ulong *val, - target_ulong new_val, - target_ulong write_mask), - void *rmw_fn_arg) -{ - if (priv <= PRV_M) { - env->aia_ireg_rmw_fn[priv] = rmw_fn; - env->aia_ireg_rmw_fn_arg[priv] = rmw_fn_arg; - } -} - -void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv) -{ - g_assert(newpriv <= PRV_M && newpriv != PRV_RESERVED); - - if (icount_enabled() && newpriv != env->priv) { - riscv_itrigger_update_priv(env); - } - /* tlb_flush is unnecessary as mode is contained in mmu_idx */ - env->priv = newpriv; - env->xl = cpu_recompute_xl(env); - riscv_cpu_update_mask(env); - - /* - * Clear the load reservation - otherwise a reservation placed in one - * context/process can be used by another, resulting in an SC succeeding - * incorrectly. Version 2.2 of the ISA specification explicitly requires - * this behaviour, while later revisions say that the kernel "should" use - * an SC instruction to force the yielding of a load reservation on a - * preemptive context switch. As a result, do both. - */ - env->load_res = -1; -} - -static target_ulong riscv_transformed_insn(CPURISCVState *env, - target_ulong insn, - target_ulong taddr) -{ - target_ulong xinsn = 0; - target_ulong access_rs1 = 0, access_imm = 0, access_size = 0; - - /* - * Only Quadrant 0 and Quadrant 2 of RVC instruction space need to - * be uncompressed. The Quadrant 1 of RVC instruction space need - * not be transformed because these instructions won't generate - * any load/store trap. - */ - - if ((insn & 0x3) != 0x3) { - /* Transform 16bit instruction into 32bit instruction */ - switch (GET_C_OP(insn)) { - case OPC_RISC_C_OP_QUAD0: /* Quadrant 0 */ - switch (GET_C_FUNC(insn)) { - case OPC_RISC_C_FUNC_FLD_LQ: - if (riscv_cpu_xlen(env) != 128) { /* C.FLD (RV32/64) */ - xinsn = OPC_RISC_FLD; - xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); - access_rs1 = GET_C_RS1S(insn); - access_imm = GET_C_LD_IMM(insn); - access_size = 8; - } - break; - case OPC_RISC_C_FUNC_LW: /* C.LW */ - xinsn = OPC_RISC_LW; - xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); - access_rs1 = GET_C_RS1S(insn); - access_imm = GET_C_LW_IMM(insn); - access_size = 4; - break; - case OPC_RISC_C_FUNC_FLW_LD: - if (riscv_cpu_xlen(env) == 32) { /* C.FLW (RV32) */ - xinsn = OPC_RISC_FLW; - xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); - access_rs1 = GET_C_RS1S(insn); - access_imm = GET_C_LW_IMM(insn); - access_size = 4; - } else { /* C.LD (RV64/RV128) */ - xinsn = OPC_RISC_LD; - xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); - access_rs1 = GET_C_RS1S(insn); - access_imm = GET_C_LD_IMM(insn); - access_size = 8; - } - break; - case OPC_RISC_C_FUNC_FSD_SQ: - if (riscv_cpu_xlen(env) != 128) { /* C.FSD (RV32/64) */ - xinsn = OPC_RISC_FSD; - xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); - access_rs1 = GET_C_RS1S(insn); - access_imm = GET_C_SD_IMM(insn); - access_size = 8; - } - break; - case OPC_RISC_C_FUNC_SW: /* C.SW */ - xinsn = OPC_RISC_SW; - xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); - access_rs1 = GET_C_RS1S(insn); - access_imm = GET_C_SW_IMM(insn); - access_size = 4; - break; - case OPC_RISC_C_FUNC_FSW_SD: - if (riscv_cpu_xlen(env) == 32) { /* C.FSW (RV32) */ - xinsn = OPC_RISC_FSW; - xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); - access_rs1 = GET_C_RS1S(insn); - access_imm = GET_C_SW_IMM(insn); - access_size = 4; - } else { /* C.SD (RV64/RV128) */ - xinsn = OPC_RISC_SD; - xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); - access_rs1 = GET_C_RS1S(insn); - access_imm = GET_C_SD_IMM(insn); - access_size = 8; - } - break; - default: - break; - } - break; - case OPC_RISC_C_OP_QUAD2: /* Quadrant 2 */ - switch (GET_C_FUNC(insn)) { - case OPC_RISC_C_FUNC_FLDSP_LQSP: - if (riscv_cpu_xlen(env) != 128) { /* C.FLDSP (RV32/64) */ - xinsn = OPC_RISC_FLD; - xinsn = SET_RD(xinsn, GET_C_RD(insn)); - access_rs1 = 2; - access_imm = GET_C_LDSP_IMM(insn); - access_size = 8; - } - break; - case OPC_RISC_C_FUNC_LWSP: /* C.LWSP */ - xinsn = OPC_RISC_LW; - xinsn = SET_RD(xinsn, GET_C_RD(insn)); - access_rs1 = 2; - access_imm = GET_C_LWSP_IMM(insn); - access_size = 4; - break; - case OPC_RISC_C_FUNC_FLWSP_LDSP: - if (riscv_cpu_xlen(env) == 32) { /* C.FLWSP (RV32) */ - xinsn = OPC_RISC_FLW; - xinsn = SET_RD(xinsn, GET_C_RD(insn)); - access_rs1 = 2; - access_imm = GET_C_LWSP_IMM(insn); - access_size = 4; - } else { /* C.LDSP (RV64/RV128) */ - xinsn = OPC_RISC_LD; - xinsn = SET_RD(xinsn, GET_C_RD(insn)); - access_rs1 = 2; - access_imm = GET_C_LDSP_IMM(insn); - access_size = 8; - } - break; - case OPC_RISC_C_FUNC_FSDSP_SQSP: - if (riscv_cpu_xlen(env) != 128) { /* C.FSDSP (RV32/64) */ - xinsn = OPC_RISC_FSD; - xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); - access_rs1 = 2; - access_imm = GET_C_SDSP_IMM(insn); - access_size = 8; - } - break; - case OPC_RISC_C_FUNC_SWSP: /* C.SWSP */ - xinsn = OPC_RISC_SW; - xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); - access_rs1 = 2; - access_imm = GET_C_SWSP_IMM(insn); - access_size = 4; - break; - case 7: - if (riscv_cpu_xlen(env) == 32) { /* C.FSWSP (RV32) */ - xinsn = OPC_RISC_FSW; - xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); - access_rs1 = 2; - access_imm = GET_C_SWSP_IMM(insn); - access_size = 4; - } else { /* C.SDSP (RV64/RV128) */ - xinsn = OPC_RISC_SD; - xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); - access_rs1 = 2; - access_imm = GET_C_SDSP_IMM(insn); - access_size = 8; - } - break; - default: - break; - } - break; - default: - break; - } - - /* - * Clear Bit1 of transformed instruction to indicate that - * original insruction was a 16bit instruction - */ - xinsn &= ~((target_ulong)0x2); - } else { - /* Transform 32bit (or wider) instructions */ - switch (MASK_OP_MAJOR(insn)) { - case OPC_RISC_ATOMIC: - xinsn = insn; - access_rs1 = GET_RS1(insn); - access_size = 1 << GET_FUNCT3(insn); - break; - case OPC_RISC_LOAD: - case OPC_RISC_FP_LOAD: - xinsn = SET_I_IMM(insn, 0); - access_rs1 = GET_RS1(insn); - access_imm = GET_IMM(insn); - access_size = 1 << GET_FUNCT3(insn); - break; - case OPC_RISC_STORE: - case OPC_RISC_FP_STORE: - xinsn = SET_S_IMM(insn, 0); - access_rs1 = GET_RS1(insn); - access_imm = GET_STORE_IMM(insn); - access_size = 1 << GET_FUNCT3(insn); - break; - case OPC_RISC_SYSTEM: - if (MASK_OP_SYSTEM(insn) == OPC_RISC_HLVHSV) { - xinsn = insn; - access_rs1 = GET_RS1(insn); - access_size = 1 << ((GET_FUNCT7(insn) >> 1) & 0x3); - access_size = 1 << access_size; - } - break; - default: - break; - } - } - - if (access_size) { - xinsn = SET_RS1(xinsn, (taddr - (env->gpr[access_rs1] + access_imm)) & - (access_size - 1)); - } - - return xinsn; -} - -/* - * Handle Traps - * - * Adapted from Spike's processor_t::take_trap. - * - */ -void riscv_cpu_do_interrupt(CPUState *cs) -{ - RISCVCPU *cpu = RISCV_CPU(cs); - CPURISCVState *env = &cpu->env; - bool write_gva = false; - uint64_t s; - - /* - * cs->exception is 32-bits wide unlike mcause which is XLEN-bits wide - * so we mask off the MSB and separate into trap type and cause. - */ - bool async = !!(cs->exception_index & RISCV_EXCP_INT_FLAG); - target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK; - uint64_t deleg = async ? env->mideleg : env->medeleg; - target_ulong tval = 0; - target_ulong tinst = 0; - target_ulong htval = 0; - target_ulong mtval2 = 0; - - if (cause == RISCV_EXCP_SEMIHOST) { - do_common_semihosting(cs); - env->pc += 4; - return; - } - - if (!async) { - /* set tval to badaddr for traps with address information */ - switch (cause) { - case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT: - case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT: - case RISCV_EXCP_LOAD_ADDR_MIS: - case RISCV_EXCP_STORE_AMO_ADDR_MIS: - case RISCV_EXCP_LOAD_ACCESS_FAULT: - case RISCV_EXCP_STORE_AMO_ACCESS_FAULT: - case RISCV_EXCP_LOAD_PAGE_FAULT: - case RISCV_EXCP_STORE_PAGE_FAULT: - write_gva = env->two_stage_lookup; - tval = env->badaddr; - if (env->two_stage_indirect_lookup) { - /* - * special pseudoinstruction for G-stage fault taken while - * doing VS-stage page table walk. - */ - tinst = (riscv_cpu_xlen(env) == 32) ? 0x00002000 : 0x00003000; - } else { - /* - * The "Addr. Offset" field in transformed instruction is - * non-zero only for misaligned access. - */ - tinst = riscv_transformed_insn(env, env->bins, tval); - } - break; - case RISCV_EXCP_INST_GUEST_PAGE_FAULT: - case RISCV_EXCP_INST_ADDR_MIS: - case RISCV_EXCP_INST_ACCESS_FAULT: - case RISCV_EXCP_INST_PAGE_FAULT: - write_gva = env->two_stage_lookup; - tval = env->badaddr; - if (env->two_stage_indirect_lookup) { - /* - * special pseudoinstruction for G-stage fault taken while - * doing VS-stage page table walk. - */ - tinst = (riscv_cpu_xlen(env) == 32) ? 0x00002000 : 0x00003000; - } - break; - case RISCV_EXCP_ILLEGAL_INST: - case RISCV_EXCP_VIRT_INSTRUCTION_FAULT: - tval = env->bins; - break; - case RISCV_EXCP_BREAKPOINT: - if (cs->watchpoint_hit) { - tval = cs->watchpoint_hit->hitaddr; - cs->watchpoint_hit = NULL; - } - break; - default: - break; - } - /* ecall is dispatched as one cause so translate based on mode */ - if (cause == RISCV_EXCP_U_ECALL) { - assert(env->priv <= 3); - - if (env->priv == PRV_M) { - cause = RISCV_EXCP_M_ECALL; - } else if (env->priv == PRV_S && env->virt_enabled) { - cause = RISCV_EXCP_VS_ECALL; - } else if (env->priv == PRV_S && !env->virt_enabled) { - cause = RISCV_EXCP_S_ECALL; - } else if (env->priv == PRV_U) { - cause = RISCV_EXCP_U_ECALL; - } - } - } - - trace_riscv_trap(env->mhartid, async, cause, env->pc, tval, - riscv_cpu_get_trap_name(cause, async)); - - qemu_log_mask(CPU_LOG_INT, - "%s: hart:"TARGET_FMT_ld", async:%d, cause:"TARGET_FMT_lx", " - "epc:0x"TARGET_FMT_lx", tval:0x"TARGET_FMT_lx", desc=%s\n", - __func__, env->mhartid, async, cause, env->pc, tval, - riscv_cpu_get_trap_name(cause, async)); - - if (env->priv <= PRV_S && - cause < TARGET_LONG_BITS && ((deleg >> cause) & 1)) { - /* handle the trap in S-mode */ - if (riscv_has_ext(env, RVH)) { - uint64_t hdeleg = async ? env->hideleg : env->hedeleg; - - if (env->virt_enabled && ((hdeleg >> cause) & 1)) { - /* Trap to VS mode */ - /* - * See if we need to adjust cause. Yes if its VS mode interrupt - * no if hypervisor has delegated one of hs mode's interrupt - */ - if (cause == IRQ_VS_TIMER || cause == IRQ_VS_SOFT || - cause == IRQ_VS_EXT) { - cause = cause - 1; - } - write_gva = false; - } else if (env->virt_enabled) { - /* Trap into HS mode, from virt */ - riscv_cpu_swap_hypervisor_regs(env); - env->hstatus = set_field(env->hstatus, HSTATUS_SPVP, - env->priv); - env->hstatus = set_field(env->hstatus, HSTATUS_SPV, true); - - htval = env->guest_phys_fault_addr; - - riscv_cpu_set_virt_enabled(env, 0); - } else { - /* Trap into HS mode */ - env->hstatus = set_field(env->hstatus, HSTATUS_SPV, false); - htval = env->guest_phys_fault_addr; - } - env->hstatus = set_field(env->hstatus, HSTATUS_GVA, write_gva); - } - - s = env->mstatus; - s = set_field(s, MSTATUS_SPIE, get_field(s, MSTATUS_SIE)); - s = set_field(s, MSTATUS_SPP, env->priv); - s = set_field(s, MSTATUS_SIE, 0); - env->mstatus = s; - env->scause = cause | ((target_ulong)async << (TARGET_LONG_BITS - 1)); - env->sepc = env->pc; - env->stval = tval; - env->htval = htval; - env->htinst = tinst; - env->pc = (env->stvec >> 2 << 2) + - ((async && (env->stvec & 3) == 1) ? cause * 4 : 0); - riscv_cpu_set_mode(env, PRV_S); - } else { - /* handle the trap in M-mode */ - if (riscv_has_ext(env, RVH)) { - if (env->virt_enabled) { - riscv_cpu_swap_hypervisor_regs(env); - } - env->mstatus = set_field(env->mstatus, MSTATUS_MPV, - env->virt_enabled); - if (env->virt_enabled && tval) { - env->mstatus = set_field(env->mstatus, MSTATUS_GVA, 1); - } - - mtval2 = env->guest_phys_fault_addr; - - /* Trapping to M mode, virt is disabled */ - riscv_cpu_set_virt_enabled(env, 0); - } - - s = env->mstatus; - s = set_field(s, MSTATUS_MPIE, get_field(s, MSTATUS_MIE)); - s = set_field(s, MSTATUS_MPP, env->priv); - s = set_field(s, MSTATUS_MIE, 0); - env->mstatus = s; - env->mcause = cause | ~(((target_ulong)-1) >> async); - env->mepc = env->pc; - env->mtval = tval; - env->mtval2 = mtval2; - env->mtinst = tinst; - env->pc = (env->mtvec >> 2 << 2) + - ((async && (env->mtvec & 3) == 1) ? cause * 4 : 0); - riscv_cpu_set_mode(env, PRV_M); - } - - /* - * NOTE: it is not necessary to yield load reservations here. It is only - * necessary for an SC from "another hart" to cause a load reservation - * to be yielded. Refer to the memory consistency model section of the - * RISC-V ISA Specification. - */ - - env->two_stage_lookup = false; - env->two_stage_indirect_lookup = false; -} - -#endif /* !CONFIG_USER_ONLY */ diff --git a/target/riscv/sysemu/cpu_helper.c b/target/riscv/sysemu/cpu_helper.c new file mode 100644 index 0000000000..05a6b834fa --- /dev/null +++ b/target/riscv/sysemu/cpu_helper.c @@ -0,0 +1,863 @@ +/* + * RISC-V CPU system helpers for QEMU. + * + * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu + * Copyright (c) 2017-2018 SiFive, Inc. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "qemu/log.h" +#include "qemu/main-loop.h" +#include "exec/exec-all.h" +#include "cpu.h" +#include "internals.h" +#include "sysemu/cpu-timers.h" +#include "sysemu/pmu.h" +#include "sysemu/instmap.h" +#include "semihosting/common-semi.h" +#include "trace.h" + + +/* + * The HS-mode is allowed to configure priority only for the + * following VS-mode local interrupts: + * + * 0 (Reserved interrupt, reads as zero) + * 1 Supervisor software interrupt + * 4 (Reserved interrupt, reads as zero) + * 5 Supervisor timer interrupt + * 8 (Reserved interrupt, reads as zero) + * 13 (Reserved interrupt) + * 14 " + * 15 " + * 16 " + * 17 " + * 18 " + * 19 " + * 20 " + * 21 " + * 22 " + * 23 " + */ + +static const int hviprio_index2irq[] = { + 0, 1, 4, 5, 8, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 }; +static const int hviprio_index2rdzero[] = { + 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; + +int riscv_cpu_hviprio_index2irq(int index, int *out_irq, int *out_rdzero) +{ + if (index < 0 || ARRAY_SIZE(hviprio_index2irq) <= index) { + return -EINVAL; + } + + if (out_irq) { + *out_irq = hviprio_index2irq[index]; + } + + if (out_rdzero) { + *out_rdzero = hviprio_index2rdzero[index]; + } + + return 0; +} + +/* + * Default priorities of local interrupts are defined in the + * RISC-V Advanced Interrupt Architecture specification. + * + * ---------------------------------------------------------------- + * Default | + * Priority | Major Interrupt Numbers + * ---------------------------------------------------------------- + * Highest | 47, 23, 46, 45, 22, 44, + * | 43, 21, 42, 41, 20, 40 + * | + * | 11 (0b), 3 (03), 7 (07) + * | 9 (09), 1 (01), 5 (05) + * | 12 (0c) + * | 10 (0a), 2 (02), 6 (06) + * | + * | 39, 19, 38, 37, 18, 36, + * Lowest | 35, 17, 34, 33, 16, 32 + * ---------------------------------------------------------------- + */ +static const uint8_t default_iprio[64] = { + /* Custom interrupts 48 to 63 */ + [63] = IPRIO_MMAXIPRIO, + [62] = IPRIO_MMAXIPRIO, + [61] = IPRIO_MMAXIPRIO, + [60] = IPRIO_MMAXIPRIO, + [59] = IPRIO_MMAXIPRIO, + [58] = IPRIO_MMAXIPRIO, + [57] = IPRIO_MMAXIPRIO, + [56] = IPRIO_MMAXIPRIO, + [55] = IPRIO_MMAXIPRIO, + [54] = IPRIO_MMAXIPRIO, + [53] = IPRIO_MMAXIPRIO, + [52] = IPRIO_MMAXIPRIO, + [51] = IPRIO_MMAXIPRIO, + [50] = IPRIO_MMAXIPRIO, + [49] = IPRIO_MMAXIPRIO, + [48] = IPRIO_MMAXIPRIO, + + /* Custom interrupts 24 to 31 */ + [31] = IPRIO_MMAXIPRIO, + [30] = IPRIO_MMAXIPRIO, + [29] = IPRIO_MMAXIPRIO, + [28] = IPRIO_MMAXIPRIO, + [27] = IPRIO_MMAXIPRIO, + [26] = IPRIO_MMAXIPRIO, + [25] = IPRIO_MMAXIPRIO, + [24] = IPRIO_MMAXIPRIO, + + [47] = IPRIO_DEFAULT_UPPER, + [23] = IPRIO_DEFAULT_UPPER + 1, + [46] = IPRIO_DEFAULT_UPPER + 2, + [45] = IPRIO_DEFAULT_UPPER + 3, + [22] = IPRIO_DEFAULT_UPPER + 4, + [44] = IPRIO_DEFAULT_UPPER + 5, + + [43] = IPRIO_DEFAULT_UPPER + 6, + [21] = IPRIO_DEFAULT_UPPER + 7, + [42] = IPRIO_DEFAULT_UPPER + 8, + [41] = IPRIO_DEFAULT_UPPER + 9, + [20] = IPRIO_DEFAULT_UPPER + 10, + [40] = IPRIO_DEFAULT_UPPER + 11, + + [11] = IPRIO_DEFAULT_M, + [3] = IPRIO_DEFAULT_M + 1, + [7] = IPRIO_DEFAULT_M + 2, + + [9] = IPRIO_DEFAULT_S, + [1] = IPRIO_DEFAULT_S + 1, + [5] = IPRIO_DEFAULT_S + 2, + + [12] = IPRIO_DEFAULT_SGEXT, + + [10] = IPRIO_DEFAULT_VS, + [2] = IPRIO_DEFAULT_VS + 1, + [6] = IPRIO_DEFAULT_VS + 2, + + [39] = IPRIO_DEFAULT_LOWER, + [19] = IPRIO_DEFAULT_LOWER + 1, + [38] = IPRIO_DEFAULT_LOWER + 2, + [37] = IPRIO_DEFAULT_LOWER + 3, + [18] = IPRIO_DEFAULT_LOWER + 4, + [36] = IPRIO_DEFAULT_LOWER + 5, + + [35] = IPRIO_DEFAULT_LOWER + 6, + [17] = IPRIO_DEFAULT_LOWER + 7, + [34] = IPRIO_DEFAULT_LOWER + 8, + [33] = IPRIO_DEFAULT_LOWER + 9, + [16] = IPRIO_DEFAULT_LOWER + 10, + [32] = IPRIO_DEFAULT_LOWER + 11, +}; + +uint8_t riscv_cpu_default_priority(int irq) +{ + if (irq < 0 || irq > 63) { + return IPRIO_MMAXIPRIO; + } + + return default_iprio[irq] ? default_iprio[irq] : IPRIO_MMAXIPRIO; +}; + +int riscv_cpu_pending_to_irq(CPURISCVState *env, + int extirq, unsigned int extirq_def_prio, + uint64_t pending, uint8_t *iprio) +{ + int irq, best_irq = RISCV_EXCP_NONE; + unsigned int prio, best_prio = UINT_MAX; + + if (!pending) { + return RISCV_EXCP_NONE; + } + + irq = ctz64(pending); + if (!((extirq == IRQ_M_EXT) ? riscv_cpu_cfg(env)->ext_smaia : + riscv_cpu_cfg(env)->ext_ssaia)) { + return irq; + } + + pending = pending >> irq; + while (pending) { + prio = iprio[irq]; + if (!prio) { + if (irq == extirq) { + prio = extirq_def_prio; + } else { + prio = (riscv_cpu_default_priority(irq) < extirq_def_prio) ? + 1 : IPRIO_MMAXIPRIO; + } + } + if ((pending & 0x1) && (prio <= best_prio)) { + best_irq = irq; + best_prio = prio; + } + irq++; + pending = pending >> 1; + } + + return best_irq; +} + +uint64_t riscv_cpu_all_pending(CPURISCVState *env) +{ + uint32_t gein = get_field(env->hstatus, HSTATUS_VGEIN); + uint64_t vsgein = (env->hgeip & (1ULL << gein)) ? MIP_VSEIP : 0; + uint64_t vstip = (env->vstime_irq) ? MIP_VSTIP : 0; + + return (env->mip | vsgein | vstip) & env->mie; +} + +int riscv_cpu_mirq_pending(CPURISCVState *env) +{ + uint64_t irqs = riscv_cpu_all_pending(env) & ~env->mideleg & + ~(MIP_SGEIP | MIP_VSSIP | MIP_VSTIP | MIP_VSEIP); + + return riscv_cpu_pending_to_irq(env, IRQ_M_EXT, IPRIO_DEFAULT_M, + irqs, env->miprio); +} + +int riscv_cpu_sirq_pending(CPURISCVState *env) +{ + uint64_t irqs = riscv_cpu_all_pending(env) & env->mideleg & + ~(MIP_VSSIP | MIP_VSTIP | MIP_VSEIP); + + return riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, + irqs, env->siprio); +} + +int riscv_cpu_vsirq_pending(CPURISCVState *env) +{ + uint64_t irqs = riscv_cpu_all_pending(env) & env->mideleg & + (MIP_VSSIP | MIP_VSTIP | MIP_VSEIP); + + return riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, + irqs >> 1, env->hviprio); +} + +/* Return true is floating point support is currently enabled */ +bool riscv_cpu_fp_enabled(CPURISCVState *env) +{ + if (env->mstatus & MSTATUS_FS) { + if (env->virt_enabled && !(env->mstatus_hs & MSTATUS_FS)) { + return false; + } + return true; + } + + return false; +} + +/* Return true is vector support is currently enabled */ +bool riscv_cpu_vector_enabled(CPURISCVState *env) +{ + if (env->mstatus & MSTATUS_VS) { + if (env->virt_enabled && !(env->mstatus_hs & MSTATUS_VS)) { + return false; + } + return true; + } + + return false; +} + +void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env) +{ + uint64_t mstatus_mask = MSTATUS_MXR | MSTATUS_SUM | + MSTATUS_SPP | MSTATUS_SPIE | MSTATUS_SIE | + MSTATUS64_UXL | MSTATUS_VS; + + if (riscv_has_ext(env, RVF)) { + mstatus_mask |= MSTATUS_FS; + } + bool current_virt = env->virt_enabled; + + g_assert(riscv_has_ext(env, RVH)); + + if (current_virt) { + /* Current V=1 and we are about to change to V=0 */ + env->vsstatus = env->mstatus & mstatus_mask; + env->mstatus &= ~mstatus_mask; + env->mstatus |= env->mstatus_hs; + + env->vstvec = env->stvec; + env->stvec = env->stvec_hs; + + env->vsscratch = env->sscratch; + env->sscratch = env->sscratch_hs; + + env->vsepc = env->sepc; + env->sepc = env->sepc_hs; + + env->vscause = env->scause; + env->scause = env->scause_hs; + + env->vstval = env->stval; + env->stval = env->stval_hs; + + env->vsatp = env->satp; + env->satp = env->satp_hs; + } else { + /* Current V=0 and we are about to change to V=1 */ + env->mstatus_hs = env->mstatus & mstatus_mask; + env->mstatus &= ~mstatus_mask; + env->mstatus |= env->vsstatus; + + env->stvec_hs = env->stvec; + env->stvec = env->vstvec; + + env->sscratch_hs = env->sscratch; + env->sscratch = env->vsscratch; + + env->sepc_hs = env->sepc; + env->sepc = env->vsepc; + + env->scause_hs = env->scause; + env->scause = env->vscause; + + env->stval_hs = env->stval; + env->stval = env->vstval; + + env->satp_hs = env->satp; + env->satp = env->vsatp; + } +} + +target_ulong riscv_cpu_get_geilen(CPURISCVState *env) +{ + if (!riscv_has_ext(env, RVH)) { + return 0; + } + + return env->geilen; +} + +void riscv_cpu_set_geilen(CPURISCVState *env, target_ulong geilen) +{ + if (!riscv_has_ext(env, RVH)) { + return; + } + + if (geilen > (TARGET_LONG_BITS - 1)) { + return; + } + + env->geilen = geilen; +} + +/* This function can only be called to set virt when RVH is enabled */ +void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable) +{ + /* Flush the TLB on all virt mode changes. */ + if (env->virt_enabled != enable) { + tlb_flush(env_cpu(env)); + } + + env->virt_enabled = enable; + + if (enable) { + /* + * The guest external interrupts from an interrupt controller are + * delivered only when the Guest/VM is running (i.e. V=1). This means + * any guest external interrupt which is triggered while the Guest/VM + * is not running (i.e. V=0) will be missed on QEMU resulting in guest + * with sluggish response to serial console input and other I/O events. + * + * To solve this, we check and inject interrupt after setting V=1. + */ + riscv_cpu_update_mip(env, 0, 0); + } +} + +int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint64_t interrupts) +{ + CPURISCVState *env = &cpu->env; + if (env->miclaim & interrupts) { + return -1; + } else { + env->miclaim |= interrupts; + return 0; + } +} + +uint64_t riscv_cpu_update_mip(CPURISCVState *env, uint64_t mask, + uint64_t value) +{ + CPUState *cs = env_cpu(env); + uint64_t gein, vsgein = 0, vstip = 0, old = env->mip; + + if (env->virt_enabled) { + gein = get_field(env->hstatus, HSTATUS_VGEIN); + vsgein = (env->hgeip & (1ULL << gein)) ? MIP_VSEIP : 0; + } + + vstip = env->vstime_irq ? MIP_VSTIP : 0; + + QEMU_IOTHREAD_LOCK_GUARD(); + + env->mip = (env->mip & ~mask) | (value & mask); + + if (env->mip | vsgein | vstip) { + cpu_interrupt(cs, CPU_INTERRUPT_HARD); + } else { + cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); + } + + return old; +} + +void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(void *), + void *arg) +{ + env->rdtime_fn = fn; + env->rdtime_fn_arg = arg; +} + +void riscv_cpu_set_aia_ireg_rmw_fn(CPURISCVState *env, uint32_t priv, + int (*rmw_fn)(void *arg, + target_ulong reg, + target_ulong *val, + target_ulong new_val, + target_ulong write_mask), + void *rmw_fn_arg) +{ + if (priv <= PRV_M) { + env->aia_ireg_rmw_fn[priv] = rmw_fn; + env->aia_ireg_rmw_fn_arg[priv] = rmw_fn_arg; + } +} + +void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv) +{ + g_assert(newpriv <= PRV_M && newpriv != PRV_RESERVED); + + if (icount_enabled() && newpriv != env->priv) { + riscv_itrigger_update_priv(env); + } + /* tlb_flush is unnecessary as mode is contained in mmu_idx */ + env->priv = newpriv; + env->xl = cpu_recompute_xl(env); + riscv_cpu_update_mask(env); + + /* + * Clear the load reservation - otherwise a reservation placed in one + * context/process can be used by another, resulting in an SC succeeding + * incorrectly. Version 2.2 of the ISA specification explicitly requires + * this behaviour, while later revisions say that the kernel "should" use + * an SC instruction to force the yielding of a load reservation on a + * preemptive context switch. As a result, do both. + */ + env->load_res = -1; +} + +static target_ulong riscv_transformed_insn(CPURISCVState *env, + target_ulong insn, + target_ulong taddr) +{ + target_ulong xinsn = 0; + target_ulong access_rs1 = 0, access_imm = 0, access_size = 0; + + /* + * Only Quadrant 0 and Quadrant 2 of RVC instruction space need to + * be uncompressed. The Quadrant 1 of RVC instruction space need + * not be transformed because these instructions won't generate + * any load/store trap. + */ + + if ((insn & 0x3) != 0x3) { + /* Transform 16bit instruction into 32bit instruction */ + switch (GET_C_OP(insn)) { + case OPC_RISC_C_OP_QUAD0: /* Quadrant 0 */ + switch (GET_C_FUNC(insn)) { + case OPC_RISC_C_FUNC_FLD_LQ: + if (riscv_cpu_xlen(env) != 128) { /* C.FLD (RV32/64) */ + xinsn = OPC_RISC_FLD; + xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); + access_rs1 = GET_C_RS1S(insn); + access_imm = GET_C_LD_IMM(insn); + access_size = 8; + } + break; + case OPC_RISC_C_FUNC_LW: /* C.LW */ + xinsn = OPC_RISC_LW; + xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); + access_rs1 = GET_C_RS1S(insn); + access_imm = GET_C_LW_IMM(insn); + access_size = 4; + break; + case OPC_RISC_C_FUNC_FLW_LD: + if (riscv_cpu_xlen(env) == 32) { /* C.FLW (RV32) */ + xinsn = OPC_RISC_FLW; + xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); + access_rs1 = GET_C_RS1S(insn); + access_imm = GET_C_LW_IMM(insn); + access_size = 4; + } else { /* C.LD (RV64/RV128) */ + xinsn = OPC_RISC_LD; + xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); + access_rs1 = GET_C_RS1S(insn); + access_imm = GET_C_LD_IMM(insn); + access_size = 8; + } + break; + case OPC_RISC_C_FUNC_FSD_SQ: + if (riscv_cpu_xlen(env) != 128) { /* C.FSD (RV32/64) */ + xinsn = OPC_RISC_FSD; + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); + access_rs1 = GET_C_RS1S(insn); + access_imm = GET_C_SD_IMM(insn); + access_size = 8; + } + break; + case OPC_RISC_C_FUNC_SW: /* C.SW */ + xinsn = OPC_RISC_SW; + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); + access_rs1 = GET_C_RS1S(insn); + access_imm = GET_C_SW_IMM(insn); + access_size = 4; + break; + case OPC_RISC_C_FUNC_FSW_SD: + if (riscv_cpu_xlen(env) == 32) { /* C.FSW (RV32) */ + xinsn = OPC_RISC_FSW; + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); + access_rs1 = GET_C_RS1S(insn); + access_imm = GET_C_SW_IMM(insn); + access_size = 4; + } else { /* C.SD (RV64/RV128) */ + xinsn = OPC_RISC_SD; + xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); + access_rs1 = GET_C_RS1S(insn); + access_imm = GET_C_SD_IMM(insn); + access_size = 8; + } + break; + default: + break; + } + break; + case OPC_RISC_C_OP_QUAD2: /* Quadrant 2 */ + switch (GET_C_FUNC(insn)) { + case OPC_RISC_C_FUNC_FLDSP_LQSP: + if (riscv_cpu_xlen(env) != 128) { /* C.FLDSP (RV32/64) */ + xinsn = OPC_RISC_FLD; + xinsn = SET_RD(xinsn, GET_C_RD(insn)); + access_rs1 = 2; + access_imm = GET_C_LDSP_IMM(insn); + access_size = 8; + } + break; + case OPC_RISC_C_FUNC_LWSP: /* C.LWSP */ + xinsn = OPC_RISC_LW; + xinsn = SET_RD(xinsn, GET_C_RD(insn)); + access_rs1 = 2; + access_imm = GET_C_LWSP_IMM(insn); + access_size = 4; + break; + case OPC_RISC_C_FUNC_FLWSP_LDSP: + if (riscv_cpu_xlen(env) == 32) { /* C.FLWSP (RV32) */ + xinsn = OPC_RISC_FLW; + xinsn = SET_RD(xinsn, GET_C_RD(insn)); + access_rs1 = 2; + access_imm = GET_C_LWSP_IMM(insn); + access_size = 4; + } else { /* C.LDSP (RV64/RV128) */ + xinsn = OPC_RISC_LD; + xinsn = SET_RD(xinsn, GET_C_RD(insn)); + access_rs1 = 2; + access_imm = GET_C_LDSP_IMM(insn); + access_size = 8; + } + break; + case OPC_RISC_C_FUNC_FSDSP_SQSP: + if (riscv_cpu_xlen(env) != 128) { /* C.FSDSP (RV32/64) */ + xinsn = OPC_RISC_FSD; + xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); + access_rs1 = 2; + access_imm = GET_C_SDSP_IMM(insn); + access_size = 8; + } + break; + case OPC_RISC_C_FUNC_SWSP: /* C.SWSP */ + xinsn = OPC_RISC_SW; + xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); + access_rs1 = 2; + access_imm = GET_C_SWSP_IMM(insn); + access_size = 4; + break; + case 7: + if (riscv_cpu_xlen(env) == 32) { /* C.FSWSP (RV32) */ + xinsn = OPC_RISC_FSW; + xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); + access_rs1 = 2; + access_imm = GET_C_SWSP_IMM(insn); + access_size = 4; + } else { /* C.SDSP (RV64/RV128) */ + xinsn = OPC_RISC_SD; + xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); + access_rs1 = 2; + access_imm = GET_C_SDSP_IMM(insn); + access_size = 8; + } + break; + default: + break; + } + break; + default: + break; + } + + /* + * Clear Bit1 of transformed instruction to indicate that + * original insruction was a 16bit instruction + */ + xinsn &= ~((target_ulong)0x2); + } else { + /* Transform 32bit (or wider) instructions */ + switch (MASK_OP_MAJOR(insn)) { + case OPC_RISC_ATOMIC: + xinsn = insn; + access_rs1 = GET_RS1(insn); + access_size = 1 << GET_FUNCT3(insn); + break; + case OPC_RISC_LOAD: + case OPC_RISC_FP_LOAD: + xinsn = SET_I_IMM(insn, 0); + access_rs1 = GET_RS1(insn); + access_imm = GET_IMM(insn); + access_size = 1 << GET_FUNCT3(insn); + break; + case OPC_RISC_STORE: + case OPC_RISC_FP_STORE: + xinsn = SET_S_IMM(insn, 0); + access_rs1 = GET_RS1(insn); + access_imm = GET_STORE_IMM(insn); + access_size = 1 << GET_FUNCT3(insn); + break; + case OPC_RISC_SYSTEM: + if (MASK_OP_SYSTEM(insn) == OPC_RISC_HLVHSV) { + xinsn = insn; + access_rs1 = GET_RS1(insn); + access_size = 1 << ((GET_FUNCT7(insn) >> 1) & 0x3); + access_size = 1 << access_size; + } + break; + default: + break; + } + } + + if (access_size) { + xinsn = SET_RS1(xinsn, (taddr - (env->gpr[access_rs1] + access_imm)) & + (access_size - 1)); + } + + return xinsn; +} + +/* + * Handle Traps + * + * Adapted from Spike's processor_t::take_trap. + * + */ +void riscv_cpu_do_interrupt(CPUState *cs) +{ + RISCVCPU *cpu = RISCV_CPU(cs); + CPURISCVState *env = &cpu->env; + bool write_gva = false; + uint64_t s; + + /* + * cs->exception is 32-bits wide unlike mcause which is XLEN-bits wide + * so we mask off the MSB and separate into trap type and cause. + */ + bool async = !!(cs->exception_index & RISCV_EXCP_INT_FLAG); + target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK; + uint64_t deleg = async ? env->mideleg : env->medeleg; + target_ulong tval = 0; + target_ulong tinst = 0; + target_ulong htval = 0; + target_ulong mtval2 = 0; + + if (cause == RISCV_EXCP_SEMIHOST) { + do_common_semihosting(cs); + env->pc += 4; + return; + } + + if (!async) { + /* set tval to badaddr for traps with address information */ + switch (cause) { + case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT: + case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT: + case RISCV_EXCP_LOAD_ADDR_MIS: + case RISCV_EXCP_STORE_AMO_ADDR_MIS: + case RISCV_EXCP_LOAD_ACCESS_FAULT: + case RISCV_EXCP_STORE_AMO_ACCESS_FAULT: + case RISCV_EXCP_LOAD_PAGE_FAULT: + case RISCV_EXCP_STORE_PAGE_FAULT: + write_gva = env->two_stage_lookup; + tval = env->badaddr; + if (env->two_stage_indirect_lookup) { + /* + * special pseudoinstruction for G-stage fault taken while + * doing VS-stage page table walk. + */ + tinst = (riscv_cpu_xlen(env) == 32) ? 0x00002000 : 0x00003000; + } else { + /* + * The "Addr. Offset" field in transformed instruction is + * non-zero only for misaligned access. + */ + tinst = riscv_transformed_insn(env, env->bins, tval); + } + break; + case RISCV_EXCP_INST_GUEST_PAGE_FAULT: + case RISCV_EXCP_INST_ADDR_MIS: + case RISCV_EXCP_INST_ACCESS_FAULT: + case RISCV_EXCP_INST_PAGE_FAULT: + write_gva = env->two_stage_lookup; + tval = env->badaddr; + if (env->two_stage_indirect_lookup) { + /* + * special pseudoinstruction for G-stage fault taken while + * doing VS-stage page table walk. + */ + tinst = (riscv_cpu_xlen(env) == 32) ? 0x00002000 : 0x00003000; + } + break; + case RISCV_EXCP_ILLEGAL_INST: + case RISCV_EXCP_VIRT_INSTRUCTION_FAULT: + tval = env->bins; + break; + case RISCV_EXCP_BREAKPOINT: + if (cs->watchpoint_hit) { + tval = cs->watchpoint_hit->hitaddr; + cs->watchpoint_hit = NULL; + } + break; + default: + break; + } + /* ecall is dispatched as one cause so translate based on mode */ + if (cause == RISCV_EXCP_U_ECALL) { + assert(env->priv <= 3); + + if (env->priv == PRV_M) { + cause = RISCV_EXCP_M_ECALL; + } else if (env->priv == PRV_S && env->virt_enabled) { + cause = RISCV_EXCP_VS_ECALL; + } else if (env->priv == PRV_S && !env->virt_enabled) { + cause = RISCV_EXCP_S_ECALL; + } else if (env->priv == PRV_U) { + cause = RISCV_EXCP_U_ECALL; + } + } + } + + trace_riscv_trap(env->mhartid, async, cause, env->pc, tval, + riscv_cpu_get_trap_name(cause, async)); + + qemu_log_mask(CPU_LOG_INT, + "%s: hart:"TARGET_FMT_ld", async:%d, cause:"TARGET_FMT_lx", " + "epc:0x"TARGET_FMT_lx", tval:0x"TARGET_FMT_lx", desc=%s\n", + __func__, env->mhartid, async, cause, env->pc, tval, + riscv_cpu_get_trap_name(cause, async)); + + if (env->priv <= PRV_S && + cause < TARGET_LONG_BITS && ((deleg >> cause) & 1)) { + /* handle the trap in S-mode */ + if (riscv_has_ext(env, RVH)) { + uint64_t hdeleg = async ? env->hideleg : env->hedeleg; + + if (env->virt_enabled && ((hdeleg >> cause) & 1)) { + /* Trap to VS mode */ + /* + * See if we need to adjust cause. Yes if its VS mode interrupt + * no if hypervisor has delegated one of hs mode's interrupt + */ + if (cause == IRQ_VS_TIMER || cause == IRQ_VS_SOFT || + cause == IRQ_VS_EXT) { + cause = cause - 1; + } + write_gva = false; + } else if (env->virt_enabled) { + /* Trap into HS mode, from virt */ + riscv_cpu_swap_hypervisor_regs(env); + env->hstatus = set_field(env->hstatus, HSTATUS_SPVP, + env->priv); + env->hstatus = set_field(env->hstatus, HSTATUS_SPV, true); + + htval = env->guest_phys_fault_addr; + + riscv_cpu_set_virt_enabled(env, 0); + } else { + /* Trap into HS mode */ + env->hstatus = set_field(env->hstatus, HSTATUS_SPV, false); + htval = env->guest_phys_fault_addr; + } + env->hstatus = set_field(env->hstatus, HSTATUS_GVA, write_gva); + } + + s = env->mstatus; + s = set_field(s, MSTATUS_SPIE, get_field(s, MSTATUS_SIE)); + s = set_field(s, MSTATUS_SPP, env->priv); + s = set_field(s, MSTATUS_SIE, 0); + env->mstatus = s; + env->scause = cause | ((target_ulong)async << (TARGET_LONG_BITS - 1)); + env->sepc = env->pc; + env->stval = tval; + env->htval = htval; + env->htinst = tinst; + env->pc = (env->stvec >> 2 << 2) + + ((async && (env->stvec & 3) == 1) ? cause * 4 : 0); + riscv_cpu_set_mode(env, PRV_S); + } else { + /* handle the trap in M-mode */ + if (riscv_has_ext(env, RVH)) { + if (env->virt_enabled) { + riscv_cpu_swap_hypervisor_regs(env); + } + env->mstatus = set_field(env->mstatus, MSTATUS_MPV, + env->virt_enabled); + if (env->virt_enabled && tval) { + env->mstatus = set_field(env->mstatus, MSTATUS_GVA, 1); + } + + mtval2 = env->guest_phys_fault_addr; + + /* Trapping to M mode, virt is disabled */ + riscv_cpu_set_virt_enabled(env, 0); + } + + s = env->mstatus; + s = set_field(s, MSTATUS_MPIE, get_field(s, MSTATUS_MIE)); + s = set_field(s, MSTATUS_MPP, env->priv); + s = set_field(s, MSTATUS_MIE, 0); + env->mstatus = s; + env->mcause = cause | ~(((target_ulong)-1) >> async); + env->mepc = env->pc; + env->mtval = tval; + env->mtval2 = mtval2; + env->mtinst = tinst; + env->pc = (env->mtvec >> 2 << 2) + + ((async && (env->mtvec & 3) == 1) ? cause * 4 : 0); + riscv_cpu_set_mode(env, PRV_M); + } + + /* + * NOTE: it is not necessary to yield load reservations here. It is only + * necessary for an SC from "another hart" to cause a load reservation + * to be yielded. Refer to the memory consistency model section of the + * RISC-V ISA Specification. + */ + + env->two_stage_lookup = false; + env->two_stage_indirect_lookup = false; +} diff --git a/target/riscv/sysemu/meson.build b/target/riscv/sysemu/meson.build index e902ba2dad..3573fdbe1f 100644 --- a/target/riscv/sysemu/meson.build +++ b/target/riscv/sysemu/meson.build @@ -1,5 +1,6 @@ riscv_system_ss.add(files( 'arch_dump.c', + 'cpu_helper.c', 'debug.c', 'machine.c', 'monitor.c',