| /* |
| * Copyright (c) 2016 RISC-V Foundation |
| * Copyright (c) 2016 The University of Virginia |
| * Copyright (c) 2020 Barkhausen Institut |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer; |
| * redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution; |
| * neither the name of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "arch/riscv/isa.hh" |
| |
| #include <ctime> |
| #include <set> |
| #include <sstream> |
| |
| #include "arch/riscv/interrupts.hh" |
| #include "arch/riscv/pagetable.hh" |
| #include "arch/riscv/registers.hh" |
| #include "base/bitfield.hh" |
| #include "base/compiler.hh" |
| #include "cpu/base.hh" |
| #include "debug/Checkpoint.hh" |
| #include "debug/RiscvMisc.hh" |
| #include "params/RiscvISA.hh" |
| #include "sim/core.hh" |
| #include "sim/pseudo_inst.hh" |
| |
| namespace RiscvISA |
| { |
| |
| M5_VAR_USED const std::array<const char *, NumMiscRegs> MiscRegNames = {{ |
| [MISCREG_PRV] = "PRV", |
| [MISCREG_ISA] = "ISA", |
| [MISCREG_VENDORID] = "VENDORID", |
| [MISCREG_ARCHID] = "ARCHID", |
| [MISCREG_IMPID] = "IMPID", |
| [MISCREG_HARTID] = "HARTID", |
| [MISCREG_STATUS] = "STATUS", |
| [MISCREG_IP] = "IP", |
| [MISCREG_IE] = "IE", |
| [MISCREG_CYCLE] = "CYCLE", |
| [MISCREG_TIME] = "TIME", |
| [MISCREG_INSTRET] = "INSTRET", |
| [MISCREG_HPMCOUNTER03] = "HPMCOUNTER03", |
| [MISCREG_HPMCOUNTER04] = "HPMCOUNTER04", |
| [MISCREG_HPMCOUNTER05] = "HPMCOUNTER05", |
| [MISCREG_HPMCOUNTER06] = "HPMCOUNTER06", |
| [MISCREG_HPMCOUNTER07] = "HPMCOUNTER07", |
| [MISCREG_HPMCOUNTER08] = "HPMCOUNTER08", |
| [MISCREG_HPMCOUNTER09] = "HPMCOUNTER09", |
| [MISCREG_HPMCOUNTER10] = "HPMCOUNTER10", |
| [MISCREG_HPMCOUNTER11] = "HPMCOUNTER11", |
| [MISCREG_HPMCOUNTER12] = "HPMCOUNTER12", |
| [MISCREG_HPMCOUNTER13] = "HPMCOUNTER13", |
| [MISCREG_HPMCOUNTER14] = "HPMCOUNTER14", |
| [MISCREG_HPMCOUNTER15] = "HPMCOUNTER15", |
| [MISCREG_HPMCOUNTER16] = "HPMCOUNTER16", |
| [MISCREG_HPMCOUNTER17] = "HPMCOUNTER17", |
| [MISCREG_HPMCOUNTER18] = "HPMCOUNTER18", |
| [MISCREG_HPMCOUNTER19] = "HPMCOUNTER19", |
| [MISCREG_HPMCOUNTER20] = "HPMCOUNTER20", |
| [MISCREG_HPMCOUNTER21] = "HPMCOUNTER21", |
| [MISCREG_HPMCOUNTER22] = "HPMCOUNTER22", |
| [MISCREG_HPMCOUNTER23] = "HPMCOUNTER23", |
| [MISCREG_HPMCOUNTER24] = "HPMCOUNTER24", |
| [MISCREG_HPMCOUNTER25] = "HPMCOUNTER25", |
| [MISCREG_HPMCOUNTER26] = "HPMCOUNTER26", |
| [MISCREG_HPMCOUNTER27] = "HPMCOUNTER27", |
| [MISCREG_HPMCOUNTER28] = "HPMCOUNTER28", |
| [MISCREG_HPMCOUNTER29] = "HPMCOUNTER29", |
| [MISCREG_HPMCOUNTER30] = "HPMCOUNTER30", |
| [MISCREG_HPMCOUNTER31] = "HPMCOUNTER31", |
| [MISCREG_HPMEVENT03] = "HPMEVENT03", |
| [MISCREG_HPMEVENT04] = "HPMEVENT04", |
| [MISCREG_HPMEVENT05] = "HPMEVENT05", |
| [MISCREG_HPMEVENT06] = "HPMEVENT06", |
| [MISCREG_HPMEVENT07] = "HPMEVENT07", |
| [MISCREG_HPMEVENT08] = "HPMEVENT08", |
| [MISCREG_HPMEVENT09] = "HPMEVENT09", |
| [MISCREG_HPMEVENT10] = "HPMEVENT10", |
| [MISCREG_HPMEVENT11] = "HPMEVENT11", |
| [MISCREG_HPMEVENT12] = "HPMEVENT12", |
| [MISCREG_HPMEVENT13] = "HPMEVENT13", |
| [MISCREG_HPMEVENT14] = "HPMEVENT14", |
| [MISCREG_HPMEVENT15] = "HPMEVENT15", |
| [MISCREG_HPMEVENT16] = "HPMEVENT16", |
| [MISCREG_HPMEVENT17] = "HPMEVENT17", |
| [MISCREG_HPMEVENT18] = "HPMEVENT18", |
| [MISCREG_HPMEVENT19] = "HPMEVENT19", |
| [MISCREG_HPMEVENT20] = "HPMEVENT20", |
| [MISCREG_HPMEVENT21] = "HPMEVENT21", |
| [MISCREG_HPMEVENT22] = "HPMEVENT22", |
| [MISCREG_HPMEVENT23] = "HPMEVENT23", |
| [MISCREG_HPMEVENT24] = "HPMEVENT24", |
| [MISCREG_HPMEVENT25] = "HPMEVENT25", |
| [MISCREG_HPMEVENT26] = "HPMEVENT26", |
| [MISCREG_HPMEVENT27] = "HPMEVENT27", |
| [MISCREG_HPMEVENT28] = "HPMEVENT28", |
| [MISCREG_HPMEVENT29] = "HPMEVENT29", |
| [MISCREG_HPMEVENT30] = "HPMEVENT30", |
| [MISCREG_HPMEVENT31] = "HPMEVENT31", |
| [MISCREG_TSELECT] = "TSELECT", |
| [MISCREG_TDATA1] = "TDATA1", |
| [MISCREG_TDATA2] = "TDATA2", |
| [MISCREG_TDATA3] = "TDATA3", |
| [MISCREG_DCSR] = "DCSR", |
| [MISCREG_DPC] = "DPC", |
| [MISCREG_DSCRATCH] = "DSCRATCH", |
| |
| [MISCREG_MEDELEG] = "MEDELEG", |
| [MISCREG_MIDELEG] = "MIDELEG", |
| [MISCREG_MTVEC] = "MTVEC", |
| [MISCREG_MCOUNTEREN] = "MCOUNTEREN", |
| [MISCREG_MSCRATCH] = "MSCRATCH", |
| [MISCREG_MEPC] = "MEPC", |
| [MISCREG_MCAUSE] = "MCAUSE", |
| [MISCREG_MTVAL] = "MTVAL", |
| [MISCREG_PMPCFG0] = "PMPCFG0", |
| // pmpcfg1 rv32 only |
| [MISCREG_PMPCFG2] = "PMPCFG2", |
| // pmpcfg3 rv32 only |
| [MISCREG_PMPADDR00] = "PMPADDR00", |
| [MISCREG_PMPADDR01] = "PMPADDR01", |
| [MISCREG_PMPADDR02] = "PMPADDR02", |
| [MISCREG_PMPADDR03] = "PMPADDR03", |
| [MISCREG_PMPADDR04] = "PMPADDR04", |
| [MISCREG_PMPADDR05] = "PMPADDR05", |
| [MISCREG_PMPADDR06] = "PMPADDR06", |
| [MISCREG_PMPADDR07] = "PMPADDR07", |
| [MISCREG_PMPADDR08] = "PMPADDR08", |
| [MISCREG_PMPADDR09] = "PMPADDR09", |
| [MISCREG_PMPADDR10] = "PMPADDR10", |
| [MISCREG_PMPADDR11] = "PMPADDR11", |
| [MISCREG_PMPADDR12] = "PMPADDR12", |
| [MISCREG_PMPADDR13] = "PMPADDR13", |
| [MISCREG_PMPADDR14] = "PMPADDR14", |
| [MISCREG_PMPADDR15] = "PMPADDR15", |
| |
| [MISCREG_SEDELEG] = "SEDELEG", |
| [MISCREG_SIDELEG] = "SIDELEG", |
| [MISCREG_STVEC] = "STVEC", |
| [MISCREG_SCOUNTEREN] = "SCOUNTEREN", |
| [MISCREG_SSCRATCH] = "SSCRATCH", |
| [MISCREG_SEPC] = "SEPC", |
| [MISCREG_SCAUSE] = "SCAUSE", |
| [MISCREG_STVAL] = "STVAL", |
| [MISCREG_SATP] = "SATP", |
| |
| [MISCREG_UTVEC] = "UTVEC", |
| [MISCREG_USCRATCH] = "USCRATCH", |
| [MISCREG_UEPC] = "UEPC", |
| [MISCREG_UCAUSE] = "UCAUSE", |
| [MISCREG_UTVAL] = "UTVAL", |
| [MISCREG_FFLAGS] = "FFLAGS", |
| [MISCREG_FRM] = "FRM", |
| }}; |
| |
| ISA::ISA(const Params &p) : BaseISA(p) |
| { |
| miscRegFile.resize(NumMiscRegs); |
| clear(); |
| } |
| |
| void ISA::clear() |
| { |
| std::fill(miscRegFile.begin(), miscRegFile.end(), 0); |
| |
| miscRegFile[MISCREG_PRV] = PRV_M; |
| miscRegFile[MISCREG_ISA] = (2ULL << MXL_OFFSET) | 0x14112D; |
| miscRegFile[MISCREG_VENDORID] = 0; |
| miscRegFile[MISCREG_ARCHID] = 0; |
| miscRegFile[MISCREG_IMPID] = 0; |
| miscRegFile[MISCREG_STATUS] = (2ULL << UXL_OFFSET) | (2ULL << SXL_OFFSET) | |
| (1ULL << FS_OFFSET); |
| miscRegFile[MISCREG_MCOUNTEREN] = 0x7; |
| miscRegFile[MISCREG_SCOUNTEREN] = 0x7; |
| // don't set it to zero; software may try to determine the supported |
| // triggers, starting at zero. simply set a different value here. |
| miscRegFile[MISCREG_TSELECT] = 1; |
| } |
| |
| bool |
| ISA::hpmCounterEnabled(int misc_reg) const |
| { |
| int hpmcounter = misc_reg - MISCREG_CYCLE; |
| if (hpmcounter < 0 || hpmcounter > 31) |
| panic("Illegal HPM counter %d\n", hpmcounter); |
| int counteren; |
| switch (readMiscRegNoEffect(MISCREG_PRV)) { |
| case PRV_M: |
| return true; |
| case PRV_S: |
| counteren = MISCREG_MCOUNTEREN; |
| break; |
| case PRV_U: |
| counteren = MISCREG_SCOUNTEREN; |
| break; |
| default: |
| panic("Unknown privilege level %d\n", miscRegFile[MISCREG_PRV]); |
| return false; |
| } |
| return (miscRegFile[counteren] & (1ULL << (hpmcounter))) > 0; |
| } |
| |
| RegVal |
| ISA::readMiscRegNoEffect(int misc_reg) const |
| { |
| if (misc_reg > NumMiscRegs || misc_reg < 0) { |
| // Illegal CSR |
| panic("Illegal CSR index %#x\n", misc_reg); |
| return -1; |
| } |
| DPRINTF(RiscvMisc, "Reading MiscReg %s (%d): %#x.\n", |
| MiscRegNames[misc_reg], misc_reg, miscRegFile[misc_reg]); |
| return miscRegFile[misc_reg]; |
| } |
| |
| RegVal |
| ISA::readMiscReg(int misc_reg) |
| { |
| switch (misc_reg) { |
| case MISCREG_HARTID: |
| return tc->contextId(); |
| case MISCREG_CYCLE: |
| if (hpmCounterEnabled(MISCREG_CYCLE)) { |
| DPRINTF(RiscvMisc, "Cycle counter at: %llu.\n", |
| tc->getCpuPtr()->curCycle()); |
| return tc->getCpuPtr()->curCycle(); |
| } else { |
| warn("Cycle counter disabled.\n"); |
| return 0; |
| } |
| case MISCREG_TIME: |
| if (hpmCounterEnabled(MISCREG_TIME)) { |
| DPRINTF(RiscvMisc, "Wall-clock counter at: %llu.\n", |
| std::time(nullptr)); |
| return std::time(nullptr); |
| } else { |
| warn("Wall clock disabled.\n"); |
| return 0; |
| } |
| case MISCREG_INSTRET: |
| if (hpmCounterEnabled(MISCREG_INSTRET)) { |
| DPRINTF(RiscvMisc, "Instruction counter at: %llu.\n", |
| tc->getCpuPtr()->totalInsts()); |
| return tc->getCpuPtr()->totalInsts(); |
| } else { |
| warn("Instruction counter disabled.\n"); |
| return 0; |
| } |
| case MISCREG_IP: |
| { |
| auto ic = dynamic_cast<RiscvISA::Interrupts *>( |
| tc->getCpuPtr()->getInterruptController(tc->threadId())); |
| return ic->readIP(); |
| } |
| case MISCREG_IE: |
| { |
| auto ic = dynamic_cast<RiscvISA::Interrupts *>( |
| tc->getCpuPtr()->getInterruptController(tc->threadId())); |
| return ic->readIE(); |
| } |
| case MISCREG_SEPC: |
| case MISCREG_MEPC: |
| { |
| auto misa = readMiscRegNoEffect(MISCREG_ISA); |
| auto val = readMiscRegNoEffect(misc_reg); |
| // if compressed instructions are disabled, epc[1] is set to 0 |
| if ((misa & ISA_EXT_C_MASK) == 0) |
| return mbits(val, 63, 2); |
| // epc[0] is always 0 |
| else |
| return mbits(val, 63, 1); |
| } |
| default: |
| // Try reading HPM counters |
| // As a placeholder, all HPM counters are just cycle counters |
| if (misc_reg >= MISCREG_HPMCOUNTER03 && |
| misc_reg <= MISCREG_HPMCOUNTER31) { |
| if (hpmCounterEnabled(misc_reg)) { |
| DPRINTF(RiscvMisc, "HPM counter %d: %llu.\n", |
| misc_reg - MISCREG_CYCLE, tc->getCpuPtr()->curCycle()); |
| return tc->getCpuPtr()->curCycle(); |
| } else { |
| warn("HPM counter %d disabled.\n", misc_reg - MISCREG_CYCLE); |
| return 0; |
| } |
| } |
| return readMiscRegNoEffect(misc_reg); |
| } |
| } |
| |
| void |
| ISA::setMiscRegNoEffect(int misc_reg, RegVal val) |
| { |
| if (misc_reg > NumMiscRegs || misc_reg < 0) { |
| // Illegal CSR |
| panic("Illegal CSR index %#x\n", misc_reg); |
| } |
| DPRINTF(RiscvMisc, "Setting MiscReg %s (%d) to %#x.\n", |
| MiscRegNames[misc_reg], misc_reg, val); |
| miscRegFile[misc_reg] = val; |
| } |
| |
| void |
| ISA::setMiscReg(int misc_reg, RegVal val) |
| { |
| if (misc_reg >= MISCREG_CYCLE && misc_reg <= MISCREG_HPMCOUNTER31) { |
| // Ignore writes to HPM counters for now |
| warn("Ignoring write to %s.\n", CSRData.at(misc_reg).name); |
| } else { |
| switch (misc_reg) { |
| case MISCREG_IP: |
| { |
| auto ic = dynamic_cast<RiscvISA::Interrupts *>( |
| tc->getCpuPtr()->getInterruptController(tc->threadId())); |
| ic->setIP(val); |
| } |
| break; |
| case MISCREG_IE: |
| { |
| auto ic = dynamic_cast<RiscvISA::Interrupts *>( |
| tc->getCpuPtr()->getInterruptController(tc->threadId())); |
| ic->setIE(val); |
| } |
| break; |
| case MISCREG_SATP: |
| { |
| // we only support bare and Sv39 mode; setting a different mode |
| // shall have no effect (see 4.1.12 in priv ISA manual) |
| SATP cur_val = readMiscRegNoEffect(misc_reg); |
| SATP new_val = val; |
| if (new_val.mode != AddrXlateMode::BARE && |
| new_val.mode != AddrXlateMode::SV39) |
| new_val.mode = cur_val.mode; |
| setMiscRegNoEffect(misc_reg, new_val); |
| } |
| break; |
| case MISCREG_TSELECT: |
| { |
| // we don't support debugging, so always set a different value |
| // than written |
| setMiscRegNoEffect(misc_reg, val + 1); |
| } |
| break; |
| case MISCREG_ISA: |
| { |
| auto cur_val = readMiscRegNoEffect(misc_reg); |
| // only allow to disable compressed instructions |
| // if the following instruction is 4-byte aligned |
| if ((val & ISA_EXT_C_MASK) == 0 && |
| bits(tc->pcState().npc(), 2, 0) != 0) |
| val |= cur_val & ISA_EXT_C_MASK; |
| setMiscRegNoEffect(misc_reg, val); |
| } |
| break; |
| case MISCREG_STATUS: |
| { |
| // SXL and UXL are hard-wired to 64 bit |
| auto cur = readMiscRegNoEffect(misc_reg); |
| val &= ~(STATUS_SXL_MASK | STATUS_UXL_MASK); |
| val |= cur & (STATUS_SXL_MASK | STATUS_UXL_MASK); |
| setMiscRegNoEffect(misc_reg, val); |
| } |
| break; |
| default: |
| setMiscRegNoEffect(misc_reg, val); |
| } |
| } |
| } |
| |
| void |
| ISA::serialize(CheckpointOut &cp) const |
| { |
| DPRINTF(Checkpoint, "Serializing Riscv Misc Registers\n"); |
| SERIALIZE_CONTAINER(miscRegFile); |
| } |
| |
| void |
| ISA::unserialize(CheckpointIn &cp) |
| { |
| DPRINTF(Checkpoint, "Unserializing Riscv Misc Registers\n"); |
| UNSERIALIZE_CONTAINER(miscRegFile); |
| } |
| |
| } |
