/* * RISC-V CPU helpers for qemu. * * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu * Copyright (c) 2017-2018 SiFive, Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2 or later, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see . */ #include "qemu/osdep.h" #include "qemu/log.h" #include "qemu/main-loop.h" #include "cpu.h" #include "internals.h" #include "pmu.h" #include "exec/exec-all.h" #include "exec/page-protection.h" #include "instmap.h" #include "tcg/tcg-op.h" #include "trace.h" #include "semihosting/common-semi.h" #include "sysemu/cpu-timers.h" #include "cpu_bits.h" #include "debug.h" #include "tcg/oversized-guest.h" #include "pmp.h" int riscv_env_mmu_index(CPURISCVState *env, bool ifetch) { #ifdef CONFIG_USER_ONLY return 0; #else bool virt = env->virt_enabled; int mode = env->priv; /* All priv -> mmu_idx mapping are here */ if (!ifetch) { uint64_t status = env->mstatus; if (mode == PRV_M && get_field(status, MSTATUS_MPRV)) { mode = get_field(env->mstatus, MSTATUS_MPP); virt = get_field(env->mstatus, MSTATUS_MPV) && (mode != PRV_M); if (virt) { status = env->vsstatus; } } if (mode == PRV_S && get_field(status, MSTATUS_SUM)) { mode = MMUIdx_S_SUM; } } return mode | (virt ? MMU_2STAGE_BIT : 0); #endif } bool cpu_get_fcfien(CPURISCVState *env) { /* no cfi extension, return false */ if (!env_archcpu(env)->cfg.ext_zicfilp) { return false; } switch (env->priv) { case PRV_U: if (riscv_has_ext(env, RVS)) { return env->senvcfg & SENVCFG_LPE; } return env->menvcfg & MENVCFG_LPE; #ifndef CONFIG_USER_ONLY case PRV_S: if (env->virt_enabled) { return env->henvcfg & HENVCFG_LPE; } return env->menvcfg & MENVCFG_LPE; case PRV_M: return env->mseccfg & MSECCFG_MLPE; #endif default: g_assert_not_reached(); } } bool cpu_get_bcfien(CPURISCVState *env) { /* no cfi extension, return false */ if (!env_archcpu(env)->cfg.ext_zicfiss) { return false; } switch (env->priv) { case PRV_U: /* * If S is not implemented then shadow stack for U can't be turned on * It is checked in `riscv_cpu_validate_set_extensions`, so no need to * check here or assert here */ return env->senvcfg & SENVCFG_SSE; #ifndef CONFIG_USER_ONLY case PRV_S: if (env->virt_enabled) { return env->henvcfg & HENVCFG_SSE; } return env->menvcfg & MENVCFG_SSE; case PRV_M: /* M-mode shadow stack is always off */ return false; #endif default: g_assert_not_reached(); } } void cpu_get_tb_cpu_state(CPURISCVState *env, vaddr *pc, uint64_t *cs_base, uint32_t *pflags) { RISCVCPU *cpu = env_archcpu(env); RISCVExtStatus fs, vs; uint32_t flags = 0; *pc = env->xl == MXL_RV32 ? env->pc & UINT32_MAX : env->pc; *cs_base = 0; if (cpu->cfg.ext_zve32x) { /* * If env->vl equals to VLMAX, we can use generic vector operation * expanders (GVEC) to accerlate the vector operations. * However, as LMUL could be a fractional number. The maximum * vector size can be operated might be less than 8 bytes, * which is not supported by GVEC. So we set vl_eq_vlmax flag to true * only when maxsz >= 8 bytes. */ /* lmul encoded as in DisasContext::lmul */ int8_t lmul = sextract32(FIELD_EX64(env->vtype, VTYPE, VLMUL), 0, 3); uint32_t vsew = FIELD_EX64(env->vtype, VTYPE, VSEW); uint32_t vlmax = vext_get_vlmax(cpu->cfg.vlenb, vsew, lmul); uint32_t maxsz = vlmax << vsew; bool vl_eq_vlmax = (env->vstart == 0) && (vlmax == env->vl) && (maxsz >= 8); flags = FIELD_DP32(flags, TB_FLAGS, VILL, env->vill); flags = FIELD_DP32(flags, TB_FLAGS, SEW, vsew); flags = FIELD_DP32(flags, TB_FLAGS, LMUL, FIELD_EX64(env->vtype, VTYPE, VLMUL)); flags = FIELD_DP32(flags, TB_FLAGS, VL_EQ_VLMAX, vl_eq_vlmax); flags = FIELD_DP32(flags, TB_FLAGS, VTA, FIELD_EX64(env->vtype, VTYPE, VTA)); flags = FIELD_DP32(flags, TB_FLAGS, VMA, FIELD_EX64(env->vtype, VTYPE, VMA)); flags = FIELD_DP32(flags, TB_FLAGS, VSTART_EQ_ZERO, env->vstart == 0); } else { flags = FIELD_DP32(flags, TB_FLAGS, VILL, 1); } if (cpu_get_fcfien(env)) { /* * For Forward CFI, only the expectation of a lpad at * the start of the block is tracked via env->elp. env->elp * is turned on during jalr translation. */ flags = FIELD_DP32(flags, TB_FLAGS, FCFI_LP_EXPECTED, env->elp); flags = FIELD_DP32(flags, TB_FLAGS, FCFI_ENABLED, 1); } if (cpu_get_bcfien(env)) { flags = FIELD_DP32(flags, TB_FLAGS, BCFI_ENABLED, 1); } #ifdef CONFIG_USER_ONLY fs = EXT_STATUS_DIRTY; vs = EXT_STATUS_DIRTY; #else flags = FIELD_DP32(flags, TB_FLAGS, PRIV, env->priv); flags |= riscv_env_mmu_index(env, 0); fs = get_field(env->mstatus, MSTATUS_FS); vs = get_field(env->mstatus, MSTATUS_VS); if (env->virt_enabled) { flags = FIELD_DP32(flags, TB_FLAGS, VIRT_ENABLED, 1); /* * Merge DISABLED and !DIRTY states using MIN. * We will set both fields when dirtying. */ fs = MIN(fs, get_field(env->mstatus_hs, MSTATUS_FS)); vs = MIN(vs, get_field(env->mstatus_hs, MSTATUS_VS)); } /* With Zfinx, floating point is enabled/disabled by Smstateen. */ if (!riscv_has_ext(env, RVF)) { fs = (smstateen_acc_ok(env, 0, SMSTATEEN0_FCSR) == RISCV_EXCP_NONE) ? EXT_STATUS_DIRTY : EXT_STATUS_DISABLED; } if (cpu->cfg.debug && !icount_enabled()) { flags = FIELD_DP32(flags, TB_FLAGS, ITRIGGER, env->itrigger_enabled); } #endif flags = FIELD_DP32(flags, TB_FLAGS, FS, fs); flags = FIELD_DP32(flags, TB_FLAGS, VS, vs); flags = FIELD_DP32(flags, TB_FLAGS, XL, env->xl); flags = FIELD_DP32(flags, TB_FLAGS, AXL, cpu_address_xl(env)); if (env->cur_pmmask != 0) { flags = FIELD_DP32(flags, TB_FLAGS, PM_MASK_ENABLED, 1); } if (env->cur_pmbase != 0) { flags = FIELD_DP32(flags, TB_FLAGS, PM_BASE_ENABLED, 1); } *pflags = flags; } void riscv_cpu_update_mask(CPURISCVState *env) { target_ulong mask = 0, base = 0; RISCVMXL xl = env->xl; /* * TODO: Current RVJ spec does not specify * how the extension interacts with XLEN. */ #ifndef CONFIG_USER_ONLY int mode = cpu_address_mode(env); xl = cpu_get_xl(env, mode); if (riscv_has_ext(env, RVJ)) { switch (mode) { case PRV_M: if (env->mmte & M_PM_ENABLE) { mask = env->mpmmask; base = env->mpmbase; } break; case PRV_S: if (env->mmte & S_PM_ENABLE) { mask = env->spmmask; base = env->spmbase; } break; case PRV_U: if (env->mmte & U_PM_ENABLE) { mask = env->upmmask; base = env->upmbase; } break; default: g_assert_not_reached(); } } #endif if (xl == MXL_RV32) { env->cur_pmmask = mask & UINT32_MAX; env->cur_pmbase = base & UINT32_MAX; } else { env->cur_pmmask = mask; 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; }; static 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; } /* * Doesn't report interrupts inserted using mvip from M-mode firmware or * using hvip bits 13:63 from HS-mode. Those are returned in * riscv_cpu_sirq_pending() and riscv_cpu_vsirq_pending(). */ 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); uint64_t irqs_f = env->mvip & env->mvien & ~env->mideleg & env->sie; return riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, irqs | irqs_f, env->siprio); } int riscv_cpu_vsirq_pending(CPURISCVState *env) { uint64_t irqs = riscv_cpu_all_pending(env) & env->mideleg & env->hideleg; uint64_t irqs_f_vs = env->hvip & env->hvien & ~env->hideleg & env->vsie; uint64_t vsbits; /* Bring VS-level bits to correct position */ vsbits = irqs & VS_MODE_INTERRUPTS; irqs &= ~VS_MODE_INTERRUPTS; irqs |= vsbits >> 1; return riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, (irqs | irqs_f_vs), env->hviprio); } static int riscv_cpu_local_irq_pending(CPURISCVState *env) { uint64_t irqs, pending, mie, hsie, vsie, irqs_f, irqs_f_vs; uint64_t vsbits, irq_delegated; int virq; /* Determine interrupt enable state of all privilege modes */ if (env->virt_enabled) { mie = 1; hsie = 1; vsie = (env->priv < PRV_S) || (env->priv == PRV_S && get_field(env->mstatus, MSTATUS_SIE)); } else { mie = (env->priv < PRV_M) || (env->priv == PRV_M && get_field(env->mstatus, MSTATUS_MIE)); hsie = (env->priv < PRV_S) || (env->priv == PRV_S && get_field(env->mstatus, MSTATUS_SIE)); vsie = 0; } /* Determine all pending interrupts */ pending = riscv_cpu_all_pending(env); /* Check M-mode interrupts */ irqs = pending & ~env->mideleg & -mie; if (irqs) { return riscv_cpu_pending_to_irq(env, IRQ_M_EXT, IPRIO_DEFAULT_M, irqs, env->miprio); } /* Check for virtual S-mode interrupts. */ irqs_f = env->mvip & (env->mvien & ~env->mideleg) & env->sie; /* Check HS-mode interrupts */ irqs = ((pending & env->mideleg & ~env->hideleg) | irqs_f) & -hsie; if (irqs) { return riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, irqs, env->siprio); } /* Check for virtual VS-mode interrupts. */ irqs_f_vs = env->hvip & env->hvien & ~env->hideleg & env->vsie; /* Check VS-mode interrupts */ irq_delegated = pending & env->mideleg & env->hideleg; /* Bring VS-level bits to correct position */ vsbits = irq_delegated & VS_MODE_INTERRUPTS; irq_delegated &= ~VS_MODE_INTERRUPTS; irq_delegated |= vsbits >> 1; irqs = (irq_delegated | irqs_f_vs) & -vsie; if (irqs) { virq = riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, irqs, env->hviprio); if (virq <= 0 || (virq > 12 && virq <= 63)) { return virq; } else { return virq + 1; } } /* Indicate no pending interrupt */ return RISCV_EXCP_NONE; } bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request) { if (interrupt_request & CPU_INTERRUPT_HARD) { RISCVCPU *cpu = RISCV_CPU(cs); CPURISCVState *env = &cpu->env; int interruptno = riscv_cpu_local_irq_pending(env); if (interruptno >= 0) { cs->exception_index = RISCV_EXCP_INT_FLAG | interruptno; riscv_cpu_do_interrupt(cs); return true; } } return false; } /* 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; /* * If zicfilp extension available and henvcfg.LPE = 1, * then apply SPELP mask on mstatus */ if (env_archcpu(env)->cfg.ext_zicfilp && get_field(env->henvcfg, HENVCFG_LPE)) { mstatus_mask |= SSTATUS_SPELP; } 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; } 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; } } void riscv_cpu_interrupt(CPURISCVState *env) { uint64_t gein, vsgein = 0, vstip = 0, irqf = 0; CPUState *cs = env_cpu(env); BQL_LOCK_GUARD(); if (env->virt_enabled) { gein = get_field(env->hstatus, HSTATUS_VGEIN); vsgein = (env->hgeip & (1ULL << gein)) ? MIP_VSEIP : 0; irqf = env->hvien & env->hvip & env->vsie; } else { irqf = env->mvien & env->mvip & env->sie; } vstip = env->vstime_irq ? MIP_VSTIP : 0; if (env->mip | vsgein | vstip | irqf) { cpu_interrupt(cs, CPU_INTERRUPT_HARD); } else { cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); } } uint64_t riscv_cpu_update_mip(CPURISCVState *env, uint64_t mask, uint64_t value) { uint64_t old = env->mip; /* No need to update mip for VSTIP */ mask = ((mask == MIP_VSTIP) && env->vstime_irq) ? 0 : mask; BQL_LOCK_GUARD(); env->mip = (env->mip & ~mask) | (value & mask); riscv_cpu_interrupt(env); 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, bool virt_en) { g_assert(newpriv <= PRV_M && newpriv != PRV_RESERVED); if (newpriv != env->priv || env->virt_enabled != virt_en) { if (icount_enabled()) { riscv_itrigger_update_priv(env); } riscv_pmu_update_fixed_ctrs(env, newpriv, virt_en); } /* 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; if (riscv_has_ext(env, RVH)) { /* Flush the TLB on all virt mode changes. */ if (env->virt_enabled != virt_en) { tlb_flush(env_cpu(env)); } env->virt_enabled = virt_en; if (virt_en) { /* * 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); } } } /* * get_physical_address_pmp - check PMP permission for this physical address * * Match the PMP region and check permission for this physical address and it's * TLB page. Returns 0 if the permission checking was successful * * @env: CPURISCVState * @prot: The returned protection attributes * @addr: The physical address to be checked permission * @access_type: The type of MMU access * @mode: Indicates current privilege level. */ static int get_physical_address_pmp(CPURISCVState *env, int *prot, hwaddr addr, int size, MMUAccessType access_type, int mode) { pmp_priv_t pmp_priv; bool pmp_has_privs; if (!riscv_cpu_cfg(env)->pmp) { *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; return TRANSLATE_SUCCESS; } pmp_has_privs = pmp_hart_has_privs(env, addr, size, 1 << access_type, &pmp_priv, mode); if (!pmp_has_privs) { *prot = 0; return TRANSLATE_PMP_FAIL; } *prot = pmp_priv_to_page_prot(pmp_priv); return TRANSLATE_SUCCESS; } /* * get_physical_address - get the physical address for this virtual address * * Do a page table walk to obtain the physical address corresponding to a * virtual address. Returns 0 if the translation was successful * * Adapted from Spike's mmu_t::translate and mmu_t::walk * * @env: CPURISCVState * @physical: This will be set to the calculated physical address * @prot: The returned protection attributes * @addr: The virtual address or guest physical address to be translated * @fault_pte_addr: If not NULL, this will be set to fault pte address * when a error occurs on pte address translation. * This will already be shifted to match htval. * @access_type: The type of MMU access * @mmu_idx: Indicates current privilege level * @first_stage: Are we in first stage translation? * Second stage is used for hypervisor guest translation * @two_stage: Are we going to perform two stage translation * @is_debug: Is this access from a debugger or the monitor? */ static int get_physical_address(CPURISCVState *env, hwaddr *physical, int *ret_prot, vaddr addr, target_ulong *fault_pte_addr, int access_type, int mmu_idx, bool first_stage, bool two_stage, bool is_debug, bool is_probe) { /* * NOTE: the env->pc value visible here will not be * correct, but the value visible to the exception handler * (riscv_cpu_do_interrupt) is correct */ MemTxResult res; MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED; int mode = mmuidx_priv(mmu_idx); bool use_background = false; hwaddr ppn; int napot_bits = 0; target_ulong napot_mask; bool is_sstack_idx = ((mmu_idx & MMU_IDX_SS_WRITE) == MMU_IDX_SS_WRITE); bool sstack_page = false; /* * Check if we should use the background registers for the two * stage translation. We don't need to check if we actually need * two stage translation as that happened before this function * was called. Background registers will be used if the guest has * forced a two stage translation to be on (in HS or M mode). */ if (!env->virt_enabled && two_stage) { use_background = true; } if (mode == PRV_M || !riscv_cpu_cfg(env)->mmu) { *physical = addr; *ret_prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; return TRANSLATE_SUCCESS; } *ret_prot = 0; hwaddr base; int levels, ptidxbits, ptesize, vm, widened; if (first_stage == true) { if (use_background) { if (riscv_cpu_mxl(env) == MXL_RV32) { base = (hwaddr)get_field(env->vsatp, SATP32_PPN) << PGSHIFT; vm = get_field(env->vsatp, SATP32_MODE); } else { base = (hwaddr)get_field(env->vsatp, SATP64_PPN) << PGSHIFT; vm = get_field(env->vsatp, SATP64_MODE); } } else { if (riscv_cpu_mxl(env) == MXL_RV32) { base = (hwaddr)get_field(env->satp, SATP32_PPN) << PGSHIFT; vm = get_field(env->satp, SATP32_MODE); } else { base = (hwaddr)get_field(env->satp, SATP64_PPN) << PGSHIFT; vm = get_field(env->satp, SATP64_MODE); } } widened = 0; } else { if (riscv_cpu_mxl(env) == MXL_RV32) { base = (hwaddr)get_field(env->hgatp, SATP32_PPN) << PGSHIFT; vm = get_field(env->hgatp, SATP32_MODE); } else { base = (hwaddr)get_field(env->hgatp, SATP64_PPN) << PGSHIFT; vm = get_field(env->hgatp, SATP64_MODE); } widened = 2; } switch (vm) { case VM_1_10_SV32: levels = 2; ptidxbits = 10; ptesize = 4; break; case VM_1_10_SV39: levels = 3; ptidxbits = 9; ptesize = 8; break; case VM_1_10_SV48: levels = 4; ptidxbits = 9; ptesize = 8; break; case VM_1_10_SV57: levels = 5; ptidxbits = 9; ptesize = 8; break; case VM_1_10_MBARE: *physical = addr; *ret_prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; return TRANSLATE_SUCCESS; default: g_assert_not_reached(); } CPUState *cs = env_cpu(env); int va_bits = PGSHIFT + levels * ptidxbits + widened; int sxlen = 16 << riscv_cpu_sxl(env); int sxlen_bytes = sxlen / 8; if (first_stage == true) { target_ulong mask, masked_msbs; if (sxlen > (va_bits - 1)) { mask = (1L << (sxlen - (va_bits - 1))) - 1; } else { mask = 0; } masked_msbs = (addr >> (va_bits - 1)) & mask; if (masked_msbs != 0 && masked_msbs != mask) { return TRANSLATE_FAIL; } } else { if (vm != VM_1_10_SV32 && addr >> va_bits != 0) { return TRANSLATE_FAIL; } } bool pbmte = env->menvcfg & MENVCFG_PBMTE; bool svade = riscv_cpu_cfg(env)->ext_svade; bool svadu = riscv_cpu_cfg(env)->ext_svadu; bool adue = svadu ? env->menvcfg & MENVCFG_ADUE : !svade; if (first_stage && two_stage && env->virt_enabled) { pbmte = pbmte && (env->henvcfg & HENVCFG_PBMTE); adue = adue && (env->henvcfg & HENVCFG_ADUE); } int ptshift = (levels - 1) * ptidxbits; target_ulong pte; hwaddr pte_addr; int i; #if !TCG_OVERSIZED_GUEST restart: #endif for (i = 0; i < levels; i++, ptshift -= ptidxbits) { target_ulong idx; if (i == 0) { idx = (addr >> (PGSHIFT + ptshift)) & ((1 << (ptidxbits + widened)) - 1); } else { idx = (addr >> (PGSHIFT + ptshift)) & ((1 << ptidxbits) - 1); } /* check that physical address of PTE is legal */ if (two_stage && first_stage) { int vbase_prot; hwaddr vbase; /* Do the second stage translation on the base PTE address. */ int vbase_ret = get_physical_address(env, &vbase, &vbase_prot, base, NULL, MMU_DATA_LOAD, MMUIdx_U, false, true, is_debug, false); if (vbase_ret != TRANSLATE_SUCCESS) { if (fault_pte_addr) { *fault_pte_addr = (base + idx * ptesize) >> 2; } return TRANSLATE_G_STAGE_FAIL; } pte_addr = vbase + idx * ptesize; } else { pte_addr = base + idx * ptesize; } int pmp_prot; int pmp_ret = get_physical_address_pmp(env, &pmp_prot, pte_addr, sxlen_bytes, MMU_DATA_LOAD, PRV_S); if (pmp_ret != TRANSLATE_SUCCESS) { return TRANSLATE_PMP_FAIL; } if (riscv_cpu_mxl(env) == MXL_RV32) { pte = address_space_ldl(cs->as, pte_addr, attrs, &res); } else { pte = address_space_ldq(cs->as, pte_addr, attrs, &res); } if (res != MEMTX_OK) { return TRANSLATE_FAIL; } if (riscv_cpu_sxl(env) == MXL_RV32) { ppn = pte >> PTE_PPN_SHIFT; } else { if (pte & PTE_RESERVED) { return TRANSLATE_FAIL; } if (!pbmte && (pte & PTE_PBMT)) { return TRANSLATE_FAIL; } if (!riscv_cpu_cfg(env)->ext_svnapot && (pte & PTE_N)) { return TRANSLATE_FAIL; } ppn = (pte & (target_ulong)PTE_PPN_MASK) >> PTE_PPN_SHIFT; } if (!(pte & PTE_V)) { /* Invalid PTE */ return TRANSLATE_FAIL; } if (pte & (PTE_R | PTE_W | PTE_X)) { goto leaf; } /* Inner PTE, continue walking */ if (pte & (PTE_D | PTE_A | PTE_U | PTE_ATTR)) { return TRANSLATE_FAIL; } base = ppn << PGSHIFT; } /* No leaf pte at any translation level. */ return TRANSLATE_FAIL; leaf: if (ppn & ((1ULL << ptshift) - 1)) { /* Misaligned PPN */ return TRANSLATE_FAIL; } if (!pbmte && (pte & PTE_PBMT)) { /* Reserved without Svpbmt. */ return TRANSLATE_FAIL; } target_ulong rwx = pte & (PTE_R | PTE_W | PTE_X); /* Check for reserved combinations of RWX flags. */ switch (rwx) { case PTE_W | PTE_X: return TRANSLATE_FAIL; case PTE_W: /* if bcfi enabled, PTE_W is not reserved and shadow stack page */ if (cpu_get_bcfien(env) && first_stage) { sstack_page = true; /* * if ss index, read and write allowed. else if not a probe * then only read allowed */ rwx = is_sstack_idx ? (PTE_R | PTE_W) : (is_probe ? 0 : PTE_R); break; } return TRANSLATE_FAIL; case PTE_R: /* * no matter what's the `access_type`, shadow stack access to readonly * memory are always store page faults. During unwind, loads will be * promoted as store fault. */ if (is_sstack_idx) { return TRANSLATE_FAIL; } break; } int prot = 0; if (rwx & PTE_R) { prot |= PAGE_READ; } if (rwx & PTE_W) { prot |= PAGE_WRITE; } if (rwx & PTE_X) { bool mxr = false; /* * Use mstatus for first stage or for the second stage without * virt_enabled (MPRV+MPV) */ if (first_stage || !env->virt_enabled) { mxr = get_field(env->mstatus, MSTATUS_MXR); } /* MPRV+MPV case, check VSSTATUS */ if (first_stage && two_stage && !env->virt_enabled) { mxr |= get_field(env->vsstatus, MSTATUS_MXR); } /* * Setting MXR at HS-level overrides both VS-stage and G-stage * execute-only permissions */ if (env->virt_enabled) { mxr |= get_field(env->mstatus_hs, MSTATUS_MXR); } if (mxr) { prot |= PAGE_READ; } prot |= PAGE_EXEC; } if (pte & PTE_U) { if (mode != PRV_U) { if (!mmuidx_sum(mmu_idx)) { return TRANSLATE_FAIL; } /* SUM allows only read+write, not execute. */ prot &= PAGE_READ | PAGE_WRITE; } } else if (mode != PRV_S) { /* Supervisor PTE flags when not S mode */ return TRANSLATE_FAIL; } if (!((prot >> access_type) & 1)) { /* * Access check failed, access check failures for shadow stack are * access faults. */ return sstack_page ? TRANSLATE_PMP_FAIL : TRANSLATE_FAIL; } target_ulong updated_pte = pte; /* * If ADUE is enabled, set accessed and dirty bits. * Otherwise raise an exception if necessary. */ if (adue) { updated_pte |= PTE_A | (access_type == MMU_DATA_STORE ? PTE_D : 0); } else if (!(pte & PTE_A) || (access_type == MMU_DATA_STORE && !(pte & PTE_D))) { return TRANSLATE_FAIL; } /* Page table updates need to be atomic with MTTCG enabled */ if (updated_pte != pte && !is_debug) { if (!adue) { return TRANSLATE_FAIL; } /* * - if accessed or dirty bits need updating, and the PTE is * in RAM, then we do so atomically with a compare and swap. * - if the PTE is in IO space or ROM, then it can't be updated * and we return TRANSLATE_FAIL. * - if the PTE changed by the time we went to update it, then * it is no longer valid and we must re-walk the page table. */ MemoryRegion *mr; hwaddr l = sxlen_bytes, addr1; mr = address_space_translate(cs->as, pte_addr, &addr1, &l, false, MEMTXATTRS_UNSPECIFIED); if (memory_region_is_ram(mr)) { target_ulong *pte_pa = qemu_map_ram_ptr(mr->ram_block, addr1); #if TCG_OVERSIZED_GUEST /* * MTTCG is not enabled on oversized TCG guests so * page table updates do not need to be atomic */ *pte_pa = pte = updated_pte; #else target_ulong old_pte; if (riscv_cpu_sxl(env) == MXL_RV32) { old_pte = qatomic_cmpxchg((uint32_t *)pte_pa, pte, updated_pte); } else { old_pte = qatomic_cmpxchg(pte_pa, pte, updated_pte); } if (old_pte != pte) { goto restart; } pte = updated_pte; #endif } else { /* * Misconfigured PTE in ROM (AD bits are not preset) or * PTE is in IO space and can't be updated atomically. */ return TRANSLATE_FAIL; } } /* For superpage mappings, make a fake leaf PTE for the TLB's benefit. */ target_ulong vpn = addr >> PGSHIFT; if (riscv_cpu_cfg(env)->ext_svnapot && (pte & PTE_N)) { napot_bits = ctzl(ppn) + 1; if ((i != (levels - 1)) || (napot_bits != 4)) { return TRANSLATE_FAIL; } } napot_mask = (1 << napot_bits) - 1; *physical = (((ppn & ~napot_mask) | (vpn & napot_mask) | (vpn & (((target_ulong)1 << ptshift) - 1)) ) << PGSHIFT) | (addr & ~TARGET_PAGE_MASK); /* * Remove write permission unless this is a store, or the page is * already dirty, so that we TLB miss on later writes to update * the dirty bit. */ if (access_type != MMU_DATA_STORE && !(pte & PTE_D)) { prot &= ~PAGE_WRITE; } *ret_prot = prot; return TRANSLATE_SUCCESS; } static void raise_mmu_exception(CPURISCVState *env, target_ulong address, MMUAccessType access_type, bool pmp_violation, bool first_stage, bool two_stage, bool two_stage_indirect) { CPUState *cs = env_cpu(env); switch (access_type) { case MMU_INST_FETCH: if (pmp_violation) { cs->exception_index = RISCV_EXCP_INST_ACCESS_FAULT; } else if (env->virt_enabled && !first_stage) { cs->exception_index = RISCV_EXCP_INST_GUEST_PAGE_FAULT; } else { cs->exception_index = RISCV_EXCP_INST_PAGE_FAULT; } break; case MMU_DATA_LOAD: if (pmp_violation) { cs->exception_index = RISCV_EXCP_LOAD_ACCESS_FAULT; } else if (two_stage && !first_stage) { cs->exception_index = RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT; } else { cs->exception_index = RISCV_EXCP_LOAD_PAGE_FAULT; } break; case MMU_DATA_STORE: if (pmp_violation) { cs->exception_index = RISCV_EXCP_STORE_AMO_ACCESS_FAULT; } else if (two_stage && !first_stage) { cs->exception_index = RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT; } else { cs->exception_index = RISCV_EXCP_STORE_PAGE_FAULT; } break; default: g_assert_not_reached(); } env->badaddr = address; env->two_stage_lookup = two_stage; env->two_stage_indirect_lookup = two_stage_indirect; } hwaddr riscv_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) { RISCVCPU *cpu = RISCV_CPU(cs); CPURISCVState *env = &cpu->env; hwaddr phys_addr; int prot; int mmu_idx = riscv_env_mmu_index(&cpu->env, false); if (get_physical_address(env, &phys_addr, &prot, addr, NULL, 0, mmu_idx, true, env->virt_enabled, true, false)) { return -1; } if (env->virt_enabled) { if (get_physical_address(env, &phys_addr, &prot, phys_addr, NULL, 0, MMUIdx_U, false, true, true, false)) { return -1; } } return phys_addr & TARGET_PAGE_MASK; } void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr, unsigned size, MMUAccessType access_type, int mmu_idx, MemTxAttrs attrs, MemTxResult response, uintptr_t retaddr) { RISCVCPU *cpu = RISCV_CPU(cs); CPURISCVState *env = &cpu->env; if (access_type == MMU_DATA_STORE) { cs->exception_index = RISCV_EXCP_STORE_AMO_ACCESS_FAULT; } else if (access_type == MMU_DATA_LOAD) { cs->exception_index = RISCV_EXCP_LOAD_ACCESS_FAULT; } else { cs->exception_index = RISCV_EXCP_INST_ACCESS_FAULT; } env->badaddr = addr; env->two_stage_lookup = mmuidx_2stage(mmu_idx); env->two_stage_indirect_lookup = false; cpu_loop_exit_restore(cs, retaddr); } void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr, MMUAccessType access_type, int mmu_idx, uintptr_t retaddr) { RISCVCPU *cpu = RISCV_CPU(cs); CPURISCVState *env = &cpu->env; switch (access_type) { case MMU_INST_FETCH: cs->exception_index = RISCV_EXCP_INST_ADDR_MIS; break; case MMU_DATA_LOAD: cs->exception_index = RISCV_EXCP_LOAD_ADDR_MIS; /* shadow stack mis aligned accesses are access faults */ if (mmu_idx & MMU_IDX_SS_WRITE) { cs->exception_index = RISCV_EXCP_LOAD_ACCESS_FAULT; } break; case MMU_DATA_STORE: cs->exception_index = RISCV_EXCP_STORE_AMO_ADDR_MIS; /* shadow stack mis aligned accesses are access faults */ if (mmu_idx & MMU_IDX_SS_WRITE) { cs->exception_index = RISCV_EXCP_STORE_AMO_ACCESS_FAULT; } break; default: g_assert_not_reached(); } env->badaddr = addr; env->two_stage_lookup = mmuidx_2stage(mmu_idx); env->two_stage_indirect_lookup = false; cpu_loop_exit_restore(cs, retaddr); } static void pmu_tlb_fill_incr_ctr(RISCVCPU *cpu, MMUAccessType access_type) { enum riscv_pmu_event_idx pmu_event_type; switch (access_type) { case MMU_INST_FETCH: pmu_event_type = RISCV_PMU_EVENT_CACHE_ITLB_PREFETCH_MISS; break; case MMU_DATA_LOAD: pmu_event_type = RISCV_PMU_EVENT_CACHE_DTLB_READ_MISS; break; case MMU_DATA_STORE: pmu_event_type = RISCV_PMU_EVENT_CACHE_DTLB_WRITE_MISS; break; default: return; } riscv_pmu_incr_ctr(cpu, pmu_event_type); } bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, MMUAccessType access_type, int mmu_idx, bool probe, uintptr_t retaddr) { RISCVCPU *cpu = RISCV_CPU(cs); CPURISCVState *env = &cpu->env; vaddr im_address; hwaddr pa = 0; int prot, prot2, prot_pmp; bool pmp_violation = false; bool first_stage_error = true; bool two_stage_lookup = mmuidx_2stage(mmu_idx); bool two_stage_indirect_error = false; int ret = TRANSLATE_FAIL; int mode = mmuidx_priv(mmu_idx); /* default TLB page size */ hwaddr tlb_size = TARGET_PAGE_SIZE; env->guest_phys_fault_addr = 0; qemu_log_mask(CPU_LOG_MMU, "%s ad %" VADDR_PRIx " rw %d mmu_idx %d\n", __func__, address, access_type, mmu_idx); pmu_tlb_fill_incr_ctr(cpu, access_type); if (two_stage_lookup) { /* Two stage lookup */ ret = get_physical_address(env, &pa, &prot, address, &env->guest_phys_fault_addr, access_type, mmu_idx, true, true, false, probe); /* * A G-stage exception may be triggered during two state lookup. * And the env->guest_phys_fault_addr has already been set in * get_physical_address(). */ if (ret == TRANSLATE_G_STAGE_FAIL) { first_stage_error = false; two_stage_indirect_error = true; } qemu_log_mask(CPU_LOG_MMU, "%s 1st-stage address=%" VADDR_PRIx " ret %d physical " HWADDR_FMT_plx " prot %d\n", __func__, address, ret, pa, prot); if (ret == TRANSLATE_SUCCESS) { /* Second stage lookup */ im_address = pa; ret = get_physical_address(env, &pa, &prot2, im_address, NULL, access_type, MMUIdx_U, false, true, false, probe); qemu_log_mask(CPU_LOG_MMU, "%s 2nd-stage address=%" VADDR_PRIx " ret %d physical " HWADDR_FMT_plx " prot %d\n", __func__, im_address, ret, pa, prot2); prot &= prot2; if (ret == TRANSLATE_SUCCESS) { ret = get_physical_address_pmp(env, &prot_pmp, pa, size, access_type, mode); tlb_size = pmp_get_tlb_size(env, pa); qemu_log_mask(CPU_LOG_MMU, "%s PMP address=" HWADDR_FMT_plx " ret %d prot" " %d tlb_size %" HWADDR_PRIu "\n", __func__, pa, ret, prot_pmp, tlb_size); prot &= prot_pmp; } else { /* * Guest physical address translation failed, this is a HS * level exception */ first_stage_error = false; if (ret != TRANSLATE_PMP_FAIL) { env->guest_phys_fault_addr = (im_address | (address & (TARGET_PAGE_SIZE - 1))) >> 2; } } } } else { /* Single stage lookup */ ret = get_physical_address(env, &pa, &prot, address, NULL, access_type, mmu_idx, true, false, false, probe); qemu_log_mask(CPU_LOG_MMU, "%s address=%" VADDR_PRIx " ret %d physical " HWADDR_FMT_plx " prot %d\n", __func__, address, ret, pa, prot); if (ret == TRANSLATE_SUCCESS) { ret = get_physical_address_pmp(env, &prot_pmp, pa, size, access_type, mode); tlb_size = pmp_get_tlb_size(env, pa); qemu_log_mask(CPU_LOG_MMU, "%s PMP address=" HWADDR_FMT_plx " ret %d prot" " %d tlb_size %" HWADDR_PRIu "\n", __func__, pa, ret, prot_pmp, tlb_size); prot &= prot_pmp; } } if (ret == TRANSLATE_PMP_FAIL) { pmp_violation = true; } if (ret == TRANSLATE_SUCCESS) { tlb_set_page(cs, address & ~(tlb_size - 1), pa & ~(tlb_size - 1), prot, mmu_idx, tlb_size); return true; } else if (probe) { return false; } else { raise_mmu_exception(env, address, access_type, pmp_violation, first_stage_error, two_stage_lookup, two_stage_indirect_error); cpu_loop_exit_restore(cs, retaddr); } return true; } 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; } static target_ulong promote_load_fault(target_ulong orig_cause) { switch (orig_cause) { case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT: return RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT; case RISCV_EXCP_LOAD_ACCESS_FAULT: return RISCV_EXCP_STORE_AMO_ACCESS_FAULT; case RISCV_EXCP_LOAD_PAGE_FAULT: return RISCV_EXCP_STORE_PAGE_FAULT; } /* if no promotion, return original cause */ return orig_cause; } /* * 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 virt = env->virt_enabled; bool write_gva = false; bool always_storeamo = (env->excp_uw2 & RISCV_UW2_ALWAYS_STORE_AMO); 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; bool s_injected = env->mvip & (1 << cause) & env->mvien && !(env->mip & (1 << cause)); bool vs_injected = env->hvip & (1 << cause) & env->hvien && !(env->mip & (1 << cause)); target_ulong tval = 0; target_ulong tinst = 0; target_ulong htval = 0; target_ulong mtval2 = 0; int sxlen = 0; int mxlen = 0; if (!async) { /* set tval to badaddr for traps with address information */ switch (cause) { #ifdef CONFIG_TCG case RISCV_EXCP_SEMIHOST: do_common_semihosting(cs); env->pc += 4; return; #endif 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: if (always_storeamo) { cause = promote_load_fault(cause); } 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: tval = env->badaddr; if (cs->watchpoint_hit) { tval = cs->watchpoint_hit->hitaddr; cs->watchpoint_hit = NULL; } break; case RISCV_EXCP_SW_CHECK: tval = env->sw_check_code; 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 < 64 && (((deleg >> cause) & 1) || s_injected || vs_injected)) { /* handle the trap in S-mode */ /* save elp status */ if (cpu_get_fcfien(env)) { env->mstatus = set_field(env->mstatus, MSTATUS_SPELP, env->elp); } if (riscv_has_ext(env, RVH)) { uint64_t hdeleg = async ? env->hideleg : env->hedeleg; if (env->virt_enabled && (((hdeleg >> cause) & 1) || vs_injected)) { /* 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 (async && (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; virt = false; } 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; sxlen = 16 << riscv_cpu_sxl(env); env->scause = cause | ((target_ulong)async << (sxlen - 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, virt); } else { /* handle the trap in M-mode */ /* save elp status */ if (cpu_get_fcfien(env)) { env->mstatus = set_field(env->mstatus, MSTATUS_MPELP, env->elp); } 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 */ virt = false; } 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; mxlen = 16 << riscv_cpu_mxl(env); env->mcause = cause | ((target_ulong)async << (mxlen - 1)); 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, virt); } /* * Interrupt/exception/trap delivery is asynchronous event and as per * zicfilp spec CPU should clear up the ELP state. No harm in clearing * unconditionally. */ env->elp = false; /* * 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 */