| /* |
| * Copyright (c) 2009-2014, 2016-2020, 2022 Arm Limited |
| * All rights reserved. |
| * |
| * The license below extends only to copyright in the software and shall |
| * not be construed as granting a license to any other intellectual |
| * property including but not limited to intellectual property relating |
| * to a hardware implementation of the functionality of the software |
| * licensed hereunder. You may use the software subject to the license |
| * terms below provided that you ensure that this notice is replicated |
| * unmodified and in its entirety in all distributions of the software, |
| * modified or unmodified, in source code or in binary form. |
| * |
| * 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/arm/utility.hh" |
| |
| #include <memory> |
| |
| #include "arch/arm/faults.hh" |
| #include "arch/arm/interrupts.hh" |
| #include "arch/arm/isa.hh" |
| #include "arch/arm/mmu.hh" |
| #include "arch/arm/page_size.hh" |
| #include "arch/arm/regs/cc.hh" |
| #include "arch/arm/regs/int.hh" |
| #include "arch/arm/regs/vec.hh" |
| #include "arch/arm/system.hh" |
| #include "base/compiler.hh" |
| #include "cpu/base.hh" |
| #include "cpu/checker/cpu.hh" |
| #include "cpu/thread_context.hh" |
| #include "mem/port_proxy.hh" |
| #include "sim/full_system.hh" |
| |
| namespace gem5 |
| { |
| |
| namespace ArmISA |
| { |
| |
| void |
| sendEvent(ThreadContext *tc) |
| { |
| if (tc->readMiscReg(MISCREG_SEV_MAILBOX) == 0) { |
| // Post Interrupt and wake cpu if needed |
| tc->getCpuPtr()->postInterrupt(tc->threadId(), INT_SEV, 0); |
| } |
| } |
| |
| bool |
| isSecure(ThreadContext *tc) |
| { |
| CPSR cpsr = tc->readMiscReg(MISCREG_CPSR); |
| if (ArmSystem::haveEL(tc, EL3) && !cpsr.width && currEL(tc) == EL3) |
| return true; |
| if (ArmSystem::haveEL(tc, EL3) && cpsr.width && cpsr.mode == MODE_MON) |
| return true; |
| else |
| return isSecureBelowEL3(tc); |
| } |
| |
| bool |
| isSecureBelowEL3(ThreadContext *tc) |
| { |
| return ArmSystem::haveEL(tc, EL3) && |
| static_cast<SCR>(tc->readMiscRegNoEffect(MISCREG_SCR)).ns == 0; |
| } |
| |
| ExceptionLevel |
| debugTargetFrom(ThreadContext *tc, bool secure) |
| { |
| bool route_to_el2; |
| if (ArmSystem::haveEL(tc, EL2) && |
| (!secure || HaveExt(tc, ArmExtension::FEAT_SEL2))) { |
| if (ELIs32(tc, EL2)) { |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR); |
| const HDCR hdcr = tc->readMiscRegNoEffect(MISCREG_HDCR); |
| route_to_el2 = (hdcr.tde == 1 || hcr.tge == 1); |
| } else { |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| const HDCR mdcr = tc->readMiscRegNoEffect(MISCREG_MDCR_EL2); |
| route_to_el2 = (mdcr.tde == 1 || hcr.tge == 1); |
| } |
| }else{ |
| route_to_el2 = false; |
| } |
| ExceptionLevel target; |
| if (route_to_el2) { |
| target = EL2; |
| } else if (ArmSystem::haveEL(tc, EL3) && !ArmSystem::highestELIs64(tc) |
| && secure) { |
| target = EL3; |
| } else { |
| target = EL1; |
| } |
| return target; |
| } |
| |
| bool |
| inAArch64(ThreadContext *tc) |
| { |
| CPSR cpsr = tc->readMiscReg(MISCREG_CPSR); |
| return opModeIs64((OperatingMode) (uint8_t) cpsr.mode); |
| } |
| |
| ExceptionLevel |
| currEL(const ThreadContext *tc) |
| { |
| return static_cast<ArmISA::ISA *>( |
| const_cast<ThreadContext *>(tc)->getIsaPtr())->currEL(); |
| } |
| |
| bool |
| longDescFormatInUse(ThreadContext *tc) |
| { |
| TTBCR ttbcr = tc->readMiscReg(MISCREG_TTBCR); |
| return ArmSystem::has(ArmExtension::LPAE, tc) && ttbcr.eae; |
| } |
| |
| RegVal |
| readMPIDR(ArmSystem *arm_sys, ThreadContext *tc) |
| { |
| const ExceptionLevel current_el = currEL(tc); |
| |
| const bool is_secure = isSecureBelowEL3(tc); |
| |
| switch (current_el) { |
| case EL0: |
| // Note: in MsrMrs instruction we read the register value before |
| // checking access permissions. This means that EL0 entry must |
| // be part of the table even if MPIDR is not accessible in user |
| // mode. |
| warn_once("Trying to read MPIDR at EL0\n"); |
| [[fallthrough]]; |
| case EL1: |
| if (ArmSystem::haveEL(tc, EL2) && !is_secure) |
| return tc->readMiscReg(MISCREG_VMPIDR_EL2); |
| else |
| return getMPIDR(arm_sys, tc); |
| case EL2: |
| case EL3: |
| return getMPIDR(arm_sys, tc); |
| default: |
| panic("Invalid EL for reading MPIDR register\n"); |
| } |
| } |
| |
| RegVal |
| getMPIDR(ArmSystem *arm_sys, ThreadContext *tc) |
| { |
| // Multiprocessor Affinity Register MPIDR from Cortex(tm)-A15 Technical |
| // Reference Manual |
| // |
| // bit 31 - Multi-processor extensions available |
| // bit 30 - Uni-processor system |
| // bit 24 - Multi-threaded cores |
| // bit 11-8 - Cluster ID |
| // bit 1-0 - CPU ID |
| // |
| // We deliberately extend both the Cluster ID and CPU ID fields to allow |
| // for simulation of larger systems |
| assert((0 <= tc->cpuId()) && (tc->cpuId() < 256)); |
| assert(tc->socketId() < 65536); |
| |
| RegVal mpidr = 0x80000000; |
| |
| if (!arm_sys->multiProc) |
| replaceBits(mpidr, 30, 1); |
| |
| if (arm_sys->multiThread) |
| replaceBits(mpidr, 24, 1); |
| |
| // Get Affinity numbers |
| mpidr |= getAffinity(arm_sys, tc); |
| return mpidr; |
| } |
| |
| static RegVal |
| getAff2(ArmSystem *arm_sys, ThreadContext *tc) |
| { |
| return arm_sys->multiThread ? tc->socketId() : 0; |
| } |
| |
| static RegVal |
| getAff1(ArmSystem *arm_sys, ThreadContext *tc) |
| { |
| return arm_sys->multiThread ? tc->cpuId() : tc->socketId(); |
| } |
| |
| static RegVal |
| getAff0(ArmSystem *arm_sys, ThreadContext *tc) |
| { |
| return arm_sys->multiThread ? tc->threadId() : tc->cpuId(); |
| } |
| |
| Affinity |
| getAffinity(ArmSystem *arm_sys, ThreadContext *tc) |
| { |
| Affinity aff = 0; |
| aff.aff0 = getAff0(arm_sys, tc); |
| aff.aff1 = getAff1(arm_sys, tc); |
| aff.aff2 = getAff2(arm_sys, tc); |
| return aff; |
| } |
| |
| bool |
| HaveExt(ThreadContext* tc, ArmExtension ext) |
| { |
| auto *isa = static_cast<ArmISA::ISA *>(tc->getIsaPtr()); |
| return isa->getRelease()->has(ext); |
| } |
| |
| ExceptionLevel |
| s1TranslationRegime(ThreadContext* tc, ExceptionLevel el) |
| { |
| if (el != EL0) |
| return el; |
| else if (ArmSystem::haveEL(tc, EL3) && ELIs32(tc, EL3) && |
| static_cast<SCR>(tc->readMiscRegNoEffect(MISCREG_SCR)).ns == 0) |
| return EL3; |
| else if (HaveExt(tc, ArmExtension::FEAT_VHE) && ELIsInHost(tc, el)) |
| return EL2; |
| else |
| return EL1; |
| } |
| |
| bool |
| IsSecureEL2Enabled(ThreadContext *tc) |
| { |
| if (ArmSystem::haveEL(tc, EL2) && HaveExt(tc, ArmExtension::FEAT_SEL2) && |
| !ELIs32(tc, EL2)) { |
| if (ArmSystem::haveEL(tc, EL3)) |
| return !ELIs32(tc, EL3) && static_cast<SCR>( |
| tc->readMiscRegNoEffect(MISCREG_SCR_EL3)).eel2; |
| else |
| return isSecure(tc); |
| } |
| return false; |
| } |
| |
| bool |
| EL2Enabled(ThreadContext *tc) |
| { |
| return ArmSystem::haveEL(tc, EL2) && |
| (!ArmSystem::haveEL(tc, EL3) || static_cast<SCR>( |
| tc->readMiscRegNoEffect(MISCREG_SCR_EL3)).ns || |
| IsSecureEL2Enabled(tc)); |
| } |
| |
| bool |
| ELIs64(ThreadContext *tc, ExceptionLevel el) |
| { |
| return !ELIs32(tc, el); |
| } |
| |
| bool |
| ELIs32(ThreadContext *tc, ExceptionLevel el) |
| { |
| auto [known, aarch32] = ELUsingAArch32K(tc, el); |
| panic_if(!known, "EL state is UNKNOWN"); |
| return aarch32; |
| } |
| |
| bool |
| ELIsInHost(ThreadContext *tc, ExceptionLevel el) |
| { |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| return (ArmSystem::haveEL(tc, EL2) && |
| (IsSecureEL2Enabled(tc) || !isSecureBelowEL3(tc)) && |
| HaveExt(tc, ArmExtension::FEAT_VHE) && |
| !ELIs32(tc, EL2) && hcr.e2h == 1 && |
| (el == EL2 || (el == EL0 && hcr.tge == 1))); |
| } |
| |
| std::pair<bool, bool> |
| ELUsingAArch32K(ThreadContext *tc, ExceptionLevel el) |
| { |
| bool secure = isSecureBelowEL3(tc); |
| return ELStateUsingAArch32K(tc, el, secure); |
| } |
| |
| bool |
| haveAArch32EL(ThreadContext *tc, ExceptionLevel el) |
| { |
| if (!ArmSystem::haveEL(tc, el)) |
| return false; |
| else if (!ArmSystem::highestELIs64(tc)) |
| return true; |
| else if (ArmSystem::highestEL(tc) == el) |
| return false; |
| else if (el == EL0) |
| return true; |
| return true; |
| } |
| |
| std::pair<bool, bool> |
| ELStateUsingAArch32K(ThreadContext *tc, ExceptionLevel el, bool secure) |
| { |
| // Return true if the specified EL is in aarch32 state. |
| const bool have_el3 = ArmSystem::haveEL(tc, EL3); |
| const bool have_el2 = ArmSystem::haveEL(tc, EL2); |
| |
| panic_if(el == EL2 && !have_el2, "Asking for EL2 when it doesn't exist"); |
| panic_if(el == EL3 && !have_el3, "Asking for EL3 when it doesn't exist"); |
| |
| bool known, aarch32; |
| known = aarch32 = false; |
| if (!haveAArch32EL(tc, el)) { |
| // Target EL is the highest one in a system where |
| // the highest is using AArch64. |
| known = true; aarch32 = false; |
| } else if (secure && el == EL2) { |
| known = true; aarch32 = false; |
| } else if (!ArmSystem::highestELIs64(tc)) { |
| // All ELs are using AArch32: |
| known = true; aarch32 = true; |
| } else if (ArmSystem::highestEL(tc) == el) { |
| known = true; aarch32 = false; |
| } else { |
| SCR scr = tc->readMiscReg(MISCREG_SCR_EL3); |
| bool aarch32_below_el3 = have_el3 && scr.rw == 0 && |
| (!secure || !HaveExt(tc, ArmExtension::FEAT_SEL2) || !scr.eel2); |
| |
| HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| bool sec_el2 = HaveExt(tc, ArmExtension::FEAT_SEL2) && scr.eel2; |
| bool aarch32_at_el1 = (aarch32_below_el3 || |
| (have_el2 && (sec_el2 || !secure) && |
| hcr.rw == 0 && |
| !(hcr.e2h && hcr.tge && |
| HaveExt(tc, ArmExtension::FEAT_VHE)))); |
| |
| // Only know if EL0 using AArch32 from PSTATE |
| if (el == EL0 && !aarch32_at_el1) { |
| // EL0 controlled by PSTATE |
| CPSR cpsr = tc->readMiscReg(MISCREG_CPSR); |
| known = (currEL(tc) == EL0); |
| aarch32 = (cpsr.width == 1); |
| } else { |
| known = true; |
| aarch32 = (aarch32_below_el3 && el != EL3) || |
| (aarch32_at_el1 && (el == EL0 || el == EL1) ); |
| } |
| } |
| |
| return std::make_pair(known, aarch32); |
| } |
| |
| bool |
| ELStateUsingAArch32(ThreadContext *tc, ExceptionLevel el, bool secure) |
| { |
| auto [known, aarch32] = ELStateUsingAArch32K(tc, el, secure); |
| panic_if(!known, "EL state is UNKNOWN"); |
| return aarch32; |
| } |
| |
| bool |
| isBigEndian64(const ThreadContext *tc) |
| { |
| switch (currEL(tc)) { |
| case EL3: |
| return ((SCTLR) tc->readMiscRegNoEffect(MISCREG_SCTLR_EL3)).ee; |
| case EL2: |
| return ((SCTLR) tc->readMiscRegNoEffect(MISCREG_SCTLR_EL2)).ee; |
| case EL1: |
| return ((SCTLR) tc->readMiscRegNoEffect(MISCREG_SCTLR_EL1)).ee; |
| case EL0: |
| return ((SCTLR) tc->readMiscRegNoEffect(MISCREG_SCTLR_EL1)).e0e; |
| default: |
| panic("Invalid exception level"); |
| break; |
| } |
| } |
| |
| bool |
| badMode32(ThreadContext *tc, OperatingMode mode) |
| { |
| return unknownMode32(mode) || !ArmSystem::haveEL(tc, opModeToEL(mode)); |
| } |
| |
| bool |
| badMode(ThreadContext *tc, OperatingMode mode) |
| { |
| return unknownMode(mode) || !ArmSystem::haveEL(tc, opModeToEL(mode)); |
| } |
| |
| int |
| computeAddrTop(ThreadContext *tc, bool selbit, bool is_instr, |
| TCR tcr, ExceptionLevel el) |
| { |
| bool tbi = false; |
| bool tbid = false; |
| ExceptionLevel regime = s1TranslationRegime(tc, el); |
| if (ELIs32(tc, regime)) { |
| return 31; |
| } else { |
| switch (regime) { |
| case EL1: |
| { |
| //TCR tcr = tc->readMiscReg(MISCREG_TCR_EL1); |
| tbi = selbit? tcr.tbi1 : tcr.tbi0; |
| tbid = selbit? tcr.tbid1 : tcr.tbid0; |
| break; |
| } |
| case EL2: |
| { |
| TCR tcr = tc->readMiscReg(MISCREG_TCR_EL2); |
| if (HaveExt(tc, ArmExtension::FEAT_VHE) && ELIsInHost(tc, el)) { |
| tbi = selbit? tcr.tbi1 : tcr.tbi0; |
| tbid = selbit? tcr.tbid1 : tcr.tbid0; |
| } else { |
| tbi = tcr.tbi; |
| tbid = tcr.tbid; |
| } |
| break; |
| } |
| case EL3: |
| { |
| TCR tcr = tc->readMiscReg(MISCREG_TCR_EL3); |
| tbi = tcr.tbi; |
| tbid = tcr.tbid; |
| break; |
| } |
| default: |
| break; |
| } |
| |
| } |
| int res = (tbi && (!tbid || !is_instr))? 55: 63; |
| return res; |
| } |
| |
| Addr |
| maskTaggedAddr(Addr addr, ThreadContext *tc, ExceptionLevel el, |
| int topbit) |
| { |
| if (topbit == 63) { |
| return addr; |
| } else if (bits(addr,55) && (el <= EL1 || ELIsInHost(tc, el))) { |
| uint64_t mask = ((uint64_t)0x1 << topbit) -1; |
| addr = addr | ~mask; |
| } else { |
| addr = bits(addr, topbit, 0); |
| } |
| return addr; // Nothing to do if this is not a tagged address |
| } |
| |
| Addr |
| purifyTaggedAddr(Addr addr, ThreadContext *tc, ExceptionLevel el, |
| TCR tcr, bool is_instr) |
| { |
| bool selbit = bits(addr, 55); |
| int topbit = computeAddrTop(tc, selbit, is_instr, tcr, el); |
| |
| return maskTaggedAddr(addr, tc, el, topbit); |
| } |
| |
| Addr |
| purifyTaggedAddr(Addr addr, ThreadContext *tc, ExceptionLevel el, |
| bool is_instr) |
| { |
| |
| TCR tcr = tc->readMiscReg(MISCREG_TCR_EL1); |
| return purifyTaggedAddr(addr, tc, el, tcr, is_instr); |
| } |
| |
| Addr |
| truncPage(Addr addr) |
| { |
| return addr & ~(PageBytes - 1); |
| } |
| |
| Addr |
| roundPage(Addr addr) |
| { |
| return (addr + PageBytes - 1) & ~(PageBytes - 1); |
| } |
| |
| Fault |
| mcrMrc15Trap(const MiscRegIndex misc_reg, ExtMachInst mach_inst, |
| ThreadContext *tc, uint32_t imm) |
| { |
| ExceptionClass ec = EC_TRAPPED_CP15_MCR_MRC; |
| if (mcrMrc15TrapToHyp(misc_reg, tc, imm, &ec)) |
| return std::make_shared<HypervisorTrap>(mach_inst, imm, ec); |
| return AArch64AArch32SystemAccessTrap(misc_reg, mach_inst, tc, imm, ec); |
| } |
| |
| bool |
| mcrMrc15TrapToHyp(const MiscRegIndex misc_reg, ThreadContext *tc, uint32_t iss, |
| ExceptionClass *ec) |
| { |
| bool is_read; |
| uint32_t crm; |
| RegIndex rt; |
| uint32_t crn; |
| uint32_t opc1; |
| uint32_t opc2; |
| bool trap_to_hyp = false; |
| |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR); |
| const HDCR hdcr = tc->readMiscReg(MISCREG_HDCR); |
| const HSTR hstr = tc->readMiscReg(MISCREG_HSTR); |
| const HCPTR hcptr = tc->readMiscReg(MISCREG_HCPTR); |
| |
| if (EL2Enabled(tc) && (currEL(tc) < EL2)) { |
| mcrMrcIssExtract(iss, is_read, crm, rt, crn, opc1, opc2); |
| trap_to_hyp = ((uint32_t) hstr) & (1 << crn); |
| trap_to_hyp |= hdcr.tpm && (crn == 9) && (crm >= 12); |
| trap_to_hyp |= hcr.tidcp && ( |
| ((crn == 9) && ((crm <= 2) || ((crm >= 5) && (crm <= 8)))) || |
| ((crn == 10) && ((crm <= 1) || (crm == 4) || (crm == 8))) || |
| ((crn == 11) && ((crm <= 8) || (crm == 15)))); |
| |
| if (!trap_to_hyp) { |
| switch (unflattenMiscReg(misc_reg)) { |
| case MISCREG_CPACR: |
| trap_to_hyp = hcptr.tcpac; |
| break; |
| case MISCREG_REVIDR: |
| case MISCREG_TCMTR: |
| case MISCREG_TLBTR: |
| case MISCREG_AIDR: |
| trap_to_hyp = hcr.tid1; |
| break; |
| case MISCREG_CTR: |
| case MISCREG_CCSIDR: |
| case MISCREG_CLIDR: |
| case MISCREG_CSSELR: |
| trap_to_hyp = hcr.tid2; |
| break; |
| case MISCREG_ID_PFR0: |
| case MISCREG_ID_PFR1: |
| case MISCREG_ID_DFR0: |
| case MISCREG_ID_AFR0: |
| case MISCREG_ID_MMFR0: |
| case MISCREG_ID_MMFR1: |
| case MISCREG_ID_MMFR2: |
| case MISCREG_ID_MMFR3: |
| case MISCREG_ID_MMFR4: |
| case MISCREG_ID_ISAR0: |
| case MISCREG_ID_ISAR1: |
| case MISCREG_ID_ISAR2: |
| case MISCREG_ID_ISAR3: |
| case MISCREG_ID_ISAR4: |
| case MISCREG_ID_ISAR5: |
| case MISCREG_ID_ISAR6: |
| trap_to_hyp = hcr.tid3; |
| break; |
| case MISCREG_DCISW: |
| case MISCREG_DCCSW: |
| case MISCREG_DCCISW: |
| trap_to_hyp = hcr.tsw; |
| break; |
| case MISCREG_DCIMVAC: |
| case MISCREG_DCCIMVAC: |
| case MISCREG_DCCMVAC: |
| trap_to_hyp = hcr.tpc; |
| break; |
| case MISCREG_ICIMVAU: |
| case MISCREG_ICIALLU: |
| case MISCREG_ICIALLUIS: |
| case MISCREG_DCCMVAU: |
| trap_to_hyp = hcr.tpu; |
| break; |
| case MISCREG_TLBIALLIS: |
| case MISCREG_TLBIMVAIS: |
| case MISCREG_TLBIASIDIS: |
| case MISCREG_TLBIMVAAIS: |
| case MISCREG_TLBIMVALIS: |
| case MISCREG_TLBIMVAALIS: |
| case MISCREG_DTLBIALL: |
| case MISCREG_ITLBIALL: |
| case MISCREG_DTLBIMVA: |
| case MISCREG_ITLBIMVA: |
| case MISCREG_DTLBIASID: |
| case MISCREG_ITLBIASID: |
| case MISCREG_TLBIMVAA: |
| case MISCREG_TLBIALL: |
| case MISCREG_TLBIMVA: |
| case MISCREG_TLBIMVAL: |
| case MISCREG_TLBIMVAAL: |
| case MISCREG_TLBIASID: |
| trap_to_hyp = hcr.ttlb; |
| break; |
| case MISCREG_ACTLR: |
| trap_to_hyp = hcr.tac; |
| break; |
| case MISCREG_SCTLR: |
| case MISCREG_TTBR0: |
| case MISCREG_TTBR1: |
| case MISCREG_TTBCR: |
| case MISCREG_DACR: |
| case MISCREG_DFSR: |
| case MISCREG_IFSR: |
| case MISCREG_DFAR: |
| case MISCREG_IFAR: |
| case MISCREG_ADFSR: |
| case MISCREG_AIFSR: |
| case MISCREG_PRRR: |
| case MISCREG_NMRR: |
| case MISCREG_MAIR0: |
| case MISCREG_MAIR1: |
| case MISCREG_CONTEXTIDR: |
| trap_to_hyp = hcr.tvm & !is_read; |
| break; |
| case MISCREG_PMCR: |
| trap_to_hyp = hdcr.tpmcr; |
| break; |
| // GICv3 regs |
| case MISCREG_ICC_SGI0R: |
| { |
| auto *isa = static_cast<ArmISA::ISA *>(tc->getIsaPtr()); |
| if (isa->haveGICv3CpuIfc()) |
| trap_to_hyp = hcr.fmo; |
| } |
| break; |
| case MISCREG_ICC_SGI1R: |
| case MISCREG_ICC_ASGI1R: |
| { |
| auto *isa = static_cast<ArmISA::ISA *>(tc->getIsaPtr()); |
| if (isa->haveGICv3CpuIfc()) |
| trap_to_hyp = hcr.imo; |
| } |
| break; |
| case MISCREG_CNTFRQ ... MISCREG_CNTV_TVAL: |
| // CNTFRQ may be trapped only on reads |
| // CNTPCT and CNTVCT are read-only |
| if (MISCREG_CNTFRQ <= misc_reg && misc_reg <= MISCREG_CNTVCT && |
| !is_read) |
| break; |
| trap_to_hyp = isGenericTimerHypTrap(misc_reg, tc, ec); |
| break; |
| // No default action needed |
| default: |
| break; |
| } |
| } |
| } |
| return trap_to_hyp; |
| } |
| |
| |
| bool |
| mcrMrc14TrapToHyp(const MiscRegIndex misc_reg, ThreadContext *tc, uint32_t iss) |
| { |
| bool is_read; |
| uint32_t crm; |
| RegIndex rt; |
| uint32_t crn; |
| uint32_t opc1; |
| uint32_t opc2; |
| |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR); |
| const HDCR hdcr = tc->readMiscReg(MISCREG_HDCR); |
| const HSTR hstr = tc->readMiscReg(MISCREG_HSTR); |
| const HCPTR hcptr = tc->readMiscReg(MISCREG_HCPTR); |
| |
| bool trap_to_hyp = false; |
| |
| if (EL2Enabled(tc) && (currEL(tc) < EL2)) { |
| mcrMrcIssExtract(iss, is_read, crm, rt, crn, opc1, opc2); |
| inform("trap check M:%x N:%x 1:%x 2:%x hdcr %x, hcptr %x, hstr %x\n", |
| crm, crn, opc1, opc2, hdcr, hcptr, hstr); |
| trap_to_hyp = hdcr.tda && (opc1 == 0); |
| trap_to_hyp |= hcptr.tta && (opc1 == 1); |
| if (!trap_to_hyp) { |
| switch (unflattenMiscReg(misc_reg)) { |
| case MISCREG_DBGOSLSR: |
| case MISCREG_DBGOSLAR: |
| case MISCREG_DBGOSDLR: |
| case MISCREG_DBGPRCR: |
| trap_to_hyp = hdcr.tdosa; |
| break; |
| case MISCREG_DBGDRAR: |
| case MISCREG_DBGDSAR: |
| trap_to_hyp = hdcr.tdra; |
| break; |
| case MISCREG_JIDR: |
| trap_to_hyp = hcr.tid0; |
| break; |
| case MISCREG_JOSCR: |
| case MISCREG_JMCR: |
| trap_to_hyp = hstr.tjdbx; |
| break; |
| case MISCREG_TEECR: |
| case MISCREG_TEEHBR: |
| trap_to_hyp = hstr.ttee; |
| break; |
| // No default action needed |
| default: |
| break; |
| } |
| } |
| } |
| return trap_to_hyp; |
| } |
| |
| Fault |
| mcrrMrrc15Trap(const MiscRegIndex misc_reg, ExtMachInst mach_inst, |
| ThreadContext *tc, uint32_t imm) |
| { |
| ExceptionClass ec = EC_TRAPPED_CP15_MCRR_MRRC; |
| if (mcrrMrrc15TrapToHyp(misc_reg, tc, imm, &ec)) |
| return std::make_shared<HypervisorTrap>(mach_inst, imm, ec); |
| return AArch64AArch32SystemAccessTrap(misc_reg, mach_inst, tc, imm, ec); |
| } |
| |
| bool |
| mcrrMrrc15TrapToHyp(const MiscRegIndex misc_reg, ThreadContext *tc, |
| uint32_t iss, ExceptionClass *ec) |
| { |
| uint32_t crm; |
| RegIndex rt; |
| uint32_t crn; |
| uint32_t opc1; |
| uint32_t opc2; |
| bool is_read; |
| bool trap_to_hyp = false; |
| |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR); |
| const HSTR hstr = tc->readMiscReg(MISCREG_HSTR); |
| |
| if (EL2Enabled(tc) && (currEL(tc) < EL2)) { |
| // This is technically the wrong function, but we can re-use it for |
| // the moment because we only need one field, which overlaps with the |
| // mcrmrc layout |
| mcrMrcIssExtract(iss, is_read, crm, rt, crn, opc1, opc2); |
| trap_to_hyp = ((uint32_t)hstr) & (1 << crm); |
| |
| if (!trap_to_hyp) { |
| switch (unflattenMiscReg(misc_reg)) { |
| case MISCREG_SCTLR: |
| case MISCREG_TTBR0: |
| case MISCREG_TTBR1: |
| case MISCREG_TTBCR: |
| case MISCREG_DACR: |
| case MISCREG_DFSR: |
| case MISCREG_IFSR: |
| case MISCREG_DFAR: |
| case MISCREG_IFAR: |
| case MISCREG_ADFSR: |
| case MISCREG_AIFSR: |
| case MISCREG_PRRR: |
| case MISCREG_NMRR: |
| case MISCREG_MAIR0: |
| case MISCREG_MAIR1: |
| case MISCREG_CONTEXTIDR: |
| trap_to_hyp = hcr.tvm & !is_read; |
| break; |
| case MISCREG_CNTFRQ ... MISCREG_CNTV_TVAL: |
| // CNTFRQ may be trapped only on reads |
| // CNTPCT and CNTVCT are read-only |
| if (MISCREG_CNTFRQ <= misc_reg && misc_reg <= MISCREG_CNTVCT && |
| !is_read) { |
| break; |
| } |
| trap_to_hyp = isGenericTimerHypTrap(misc_reg, tc, ec); |
| break; |
| // No default action needed |
| default: |
| break; |
| } |
| } |
| } |
| return trap_to_hyp; |
| } |
| |
| Fault |
| AArch64AArch32SystemAccessTrap(const MiscRegIndex misc_reg, |
| ExtMachInst mach_inst, ThreadContext *tc, |
| uint32_t imm, ExceptionClass ec) |
| { |
| if (currEL(tc) <= EL1 && !ELIs32(tc, EL1) && |
| isAArch64AArch32SystemAccessTrapEL1(misc_reg, tc)) |
| return std::make_shared<SupervisorTrap>(mach_inst, imm, ec); |
| if (currEL(tc) <= EL2 && EL2Enabled(tc) && !ELIs32(tc, EL2) && |
| isAArch64AArch32SystemAccessTrapEL2(misc_reg, tc)) |
| return std::make_shared<HypervisorTrap>(mach_inst, imm, ec); |
| return NoFault; |
| } |
| |
| bool |
| isAArch64AArch32SystemAccessTrapEL1(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| switch (misc_reg) { |
| case MISCREG_CNTFRQ ... MISCREG_CNTVOFF: |
| return currEL(tc) == EL0 && |
| isGenericTimerSystemAccessTrapEL1(misc_reg, tc); |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| bool |
| isGenericTimerHypTrap(const MiscRegIndex misc_reg, ThreadContext *tc, |
| ExceptionClass *ec) |
| { |
| if (currEL(tc) <= EL2 && EL2Enabled(tc) && ELIs32(tc, EL2)) { |
| switch (misc_reg) { |
| case MISCREG_CNTFRQ ... MISCREG_CNTV_TVAL: |
| if (currEL(tc) == EL0 && |
| isGenericTimerCommonEL0HypTrap(misc_reg, tc, ec)) |
| return true; |
| switch (misc_reg) { |
| case MISCREG_CNTPCT: |
| case MISCREG_CNTP_CTL ... MISCREG_CNTP_TVAL_S: |
| return currEL(tc) <= EL1 && |
| isGenericTimerPhysHypTrap(misc_reg, tc, ec); |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| return false; |
| } |
| |
| bool |
| isGenericTimerCommonEL0HypTrap(const MiscRegIndex misc_reg, ThreadContext *tc, |
| ExceptionClass *ec) |
| { |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| bool trap_cond = condGenericTimerSystemAccessTrapEL1(misc_reg, tc); |
| if (ELIs32(tc, EL1) && trap_cond && hcr.tge) { |
| // As per the architecture, this hyp trap should have uncategorized |
| // exception class |
| if (ec) |
| *ec = EC_UNKNOWN; |
| return true; |
| } |
| return false; |
| } |
| |
| bool |
| isGenericTimerPhysHypTrap(const MiscRegIndex misc_reg, ThreadContext *tc, |
| ExceptionClass *ec) |
| { |
| return condGenericTimerPhysHypTrap(misc_reg, tc); |
| } |
| |
| bool |
| condGenericTimerPhysHypTrap(const MiscRegIndex misc_reg, ThreadContext *tc) |
| { |
| const CNTHCTL cnthctl = tc->readMiscReg(MISCREG_CNTHCTL_EL2); |
| switch (misc_reg) { |
| case MISCREG_CNTPCT: |
| return !cnthctl.el1pcten; |
| case MISCREG_CNTP_CTL ... MISCREG_CNTP_TVAL_S: |
| return !cnthctl.el1pcen; |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| bool |
| isGenericTimerSystemAccessTrapEL1(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| switch (misc_reg) { |
| case MISCREG_CNTFRQ ... MISCREG_CNTV_TVAL: |
| case MISCREG_CNTFRQ_EL0 ... MISCREG_CNTV_TVAL_EL0: |
| { |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| bool trap_cond = condGenericTimerSystemAccessTrapEL1(misc_reg, tc); |
| return !(EL2Enabled(tc) && hcr.e2h && hcr.tge) && trap_cond && |
| !(EL2Enabled(tc) && !ELIs32(tc, EL2) && hcr.tge); |
| } |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| bool |
| condGenericTimerSystemAccessTrapEL1(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| const CNTKCTL cntkctl = tc->readMiscReg(MISCREG_CNTKCTL_EL1); |
| switch (misc_reg) { |
| case MISCREG_CNTFRQ: |
| case MISCREG_CNTFRQ_EL0: |
| return !cntkctl.el0pcten && !cntkctl.el0vcten; |
| case MISCREG_CNTPCT: |
| case MISCREG_CNTPCT_EL0: |
| return !cntkctl.el0pcten; |
| case MISCREG_CNTVCT: |
| case MISCREG_CNTVCT_EL0: |
| return !cntkctl.el0vcten; |
| case MISCREG_CNTP_CTL ... MISCREG_CNTP_TVAL_S: |
| case MISCREG_CNTP_CTL_EL0 ... MISCREG_CNTP_TVAL_EL0: |
| return !cntkctl.el0pten; |
| case MISCREG_CNTV_CTL ... MISCREG_CNTV_TVAL: |
| case MISCREG_CNTV_CTL_EL0 ... MISCREG_CNTV_TVAL_EL0: |
| return !cntkctl.el0vten; |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| bool |
| isAArch64AArch32SystemAccessTrapEL2(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| switch (misc_reg) { |
| case MISCREG_CNTFRQ ... MISCREG_CNTVOFF: |
| return currEL(tc) <= EL1 && |
| isGenericTimerSystemAccessTrapEL2(misc_reg, tc); |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| bool |
| isGenericTimerSystemAccessTrapEL2(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| switch (misc_reg) { |
| case MISCREG_CNTFRQ ... MISCREG_CNTV_TVAL: |
| case MISCREG_CNTFRQ_EL0 ... MISCREG_CNTV_TVAL_EL0: |
| if (currEL(tc) == EL0 && |
| isGenericTimerCommonEL0SystemAccessTrapEL2(misc_reg, tc)) |
| return true; |
| switch (misc_reg) { |
| case MISCREG_CNTPCT: |
| case MISCREG_CNTPCT_EL0: |
| case MISCREG_CNTP_CTL ... MISCREG_CNTP_TVAL_S: |
| case MISCREG_CNTP_CTL_EL0 ... MISCREG_CNTP_TVAL_EL0: |
| return (currEL(tc) == EL0 && |
| isGenericTimerPhysEL0SystemAccessTrapEL2(misc_reg, tc)) || |
| (currEL(tc) == EL1 && |
| isGenericTimerPhysEL1SystemAccessTrapEL2(misc_reg, tc)); |
| case MISCREG_CNTVCT: |
| case MISCREG_CNTVCT_EL0: |
| case MISCREG_CNTV_CTL ... MISCREG_CNTV_TVAL: |
| case MISCREG_CNTV_CTL_EL0 ... MISCREG_CNTV_TVAL_EL0: |
| return isGenericTimerVirtSystemAccessTrapEL2(misc_reg, tc); |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| bool |
| isGenericTimerCommonEL0SystemAccessTrapEL2(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| bool trap_cond_el1 = condGenericTimerSystemAccessTrapEL1(misc_reg, tc); |
| bool trap_cond_el2 = condGenericTimerCommonEL0SystemAccessTrapEL2(misc_reg, |
| tc); |
| return (!ELIs32(tc, EL1) && !hcr.e2h && trap_cond_el1 && hcr.tge) || |
| (ELIs32(tc, EL1) && trap_cond_el1 && hcr.tge) || |
| (hcr.e2h && hcr.tge && trap_cond_el2); |
| } |
| |
| bool |
| isGenericTimerPhysEL0SystemAccessTrapEL2(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| bool trap_cond_0 = condGenericTimerPhysEL1SystemAccessTrapEL2( |
| misc_reg, tc); |
| bool trap_cond_1 = condGenericTimerCommonEL1SystemAccessTrapEL2( |
| misc_reg, tc); |
| |
| switch (misc_reg) { |
| case MISCREG_CNTPCT: |
| case MISCREG_CNTPCT_EL0: |
| return !hcr.e2h && trap_cond_1; |
| case MISCREG_CNTP_CTL ... MISCREG_CNTP_TVAL_S: |
| case MISCREG_CNTP_CTL_EL0 ... MISCREG_CNTP_TVAL_EL0: |
| return (!hcr.e2h && trap_cond_0) || |
| (hcr.e2h && !hcr.tge && trap_cond_1); |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| bool |
| isGenericTimerPhysEL1SystemAccessTrapEL2(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| bool trap_cond_0 = condGenericTimerPhysEL1SystemAccessTrapEL2( |
| misc_reg, tc); |
| bool trap_cond_1 = condGenericTimerCommonEL1SystemAccessTrapEL2( |
| misc_reg, tc); |
| |
| switch (misc_reg) { |
| case MISCREG_CNTPCT: |
| case MISCREG_CNTPCT_EL0: |
| return trap_cond_1; |
| case MISCREG_CNTP_CTL ... MISCREG_CNTP_TVAL_S: |
| case MISCREG_CNTP_CTL_EL0 ... MISCREG_CNTP_TVAL_EL0: |
| return (!hcr.e2h && trap_cond_0) || |
| (hcr.e2h && trap_cond_1); |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| bool |
| isGenericTimerVirtSystemAccessTrapEL2(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| bool trap_cond = condGenericTimerCommonEL1SystemAccessTrapEL2( |
| misc_reg, tc); |
| return !ELIs32(tc, EL1) && !(hcr.e2h && hcr.tge) && trap_cond; |
| } |
| |
| bool |
| condGenericTimerCommonEL0SystemAccessTrapEL2(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| const CNTHCTL_E2H cnthctl = tc->readMiscReg(MISCREG_CNTHCTL_EL2); |
| switch (misc_reg) { |
| case MISCREG_CNTFRQ: |
| case MISCREG_CNTFRQ_EL0: |
| return !cnthctl.el0pcten && !cnthctl.el0vcten; |
| case MISCREG_CNTPCT: |
| case MISCREG_CNTPCT_EL0: |
| return !cnthctl.el0pcten; |
| case MISCREG_CNTVCT: |
| case MISCREG_CNTVCT_EL0: |
| return !cnthctl.el0vcten; |
| case MISCREG_CNTP_CTL ... MISCREG_CNTP_TVAL_S: |
| case MISCREG_CNTP_CTL_EL0 ... MISCREG_CNTP_TVAL_EL0: |
| return !cnthctl.el0pten; |
| case MISCREG_CNTV_CTL ... MISCREG_CNTV_TVAL: |
| case MISCREG_CNTV_CTL_EL0 ... MISCREG_CNTV_TVAL_EL0: |
| return !cnthctl.el0vten; |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| bool |
| condGenericTimerCommonEL1SystemAccessTrapEL2(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| const AA64MMFR0 mmfr0 = tc->readMiscRegNoEffect(MISCREG_ID_AA64MMFR0_EL1); |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| const RegVal cnthctl_val = tc->readMiscReg(MISCREG_CNTHCTL_EL2); |
| const CNTHCTL cnthctl = cnthctl_val; |
| const CNTHCTL_E2H cnthctl_e2h = cnthctl_val; |
| switch (misc_reg) { |
| case MISCREG_CNTPCT: |
| case MISCREG_CNTPCT_EL0: |
| return hcr.e2h ? !cnthctl_e2h.el1pcten : !cnthctl.el1pcten; |
| case MISCREG_CNTVCT: |
| case MISCREG_CNTVCT_EL0: |
| if (!mmfr0.ecv) |
| return false; |
| else |
| return hcr.e2h ? cnthctl_e2h.el1tvct : cnthctl.el1tvct; |
| case MISCREG_CNTP_CTL ... MISCREG_CNTP_TVAL_S: |
| case MISCREG_CNTP_CTL_EL0 ... MISCREG_CNTP_TVAL_EL0: |
| return hcr.e2h ? !cnthctl_e2h.el1pten : false; |
| case MISCREG_CNTV_CTL ... MISCREG_CNTV_TVAL: |
| case MISCREG_CNTV_CTL_EL0 ... MISCREG_CNTV_TVAL_EL0: |
| if (!mmfr0.ecv) |
| return false; |
| else |
| return hcr.e2h ? cnthctl_e2h.el1tvt : cnthctl.el1tvt; |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| bool |
| condGenericTimerPhysEL1SystemAccessTrapEL2(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| const CNTHCTL cnthctl = tc->readMiscReg(MISCREG_CNTHCTL_EL2); |
| return !cnthctl.el1pcen; |
| } |
| |
| bool |
| isGenericTimerSystemAccessTrapEL3(const MiscRegIndex misc_reg, |
| ThreadContext *tc) |
| { |
| switch (misc_reg) { |
| case MISCREG_CNTPS_CTL_EL1 ... MISCREG_CNTPS_TVAL_EL1: |
| { |
| const SCR scr = tc->readMiscReg(MISCREG_SCR_EL3); |
| return currEL(tc) == EL1 && !scr.ns && !scr.st; |
| } |
| default: |
| break; |
| } |
| return false; |
| } |
| |
| bool |
| decodeMrsMsrBankedReg(uint8_t sysM, bool r, bool &isIntReg, int ®Idx, |
| CPSR cpsr, SCR scr, NSACR nsacr, bool checkSecurity) |
| { |
| OperatingMode mode = MODE_UNDEFINED; |
| bool ok = true; |
| |
| // R mostly indicates if its a int register or a misc reg, we override |
| // below if the few corner cases |
| isIntReg = !r; |
| // Loosely based on ARM ARM issue C section B9.3.10 |
| if (r) { |
| switch (sysM) { |
| case 0xE: |
| regIdx = MISCREG_SPSR_FIQ; |
| mode = MODE_FIQ; |
| break; |
| case 0x10: |
| regIdx = MISCREG_SPSR_IRQ; |
| mode = MODE_IRQ; |
| break; |
| case 0x12: |
| regIdx = MISCREG_SPSR_SVC; |
| mode = MODE_SVC; |
| break; |
| case 0x14: |
| regIdx = MISCREG_SPSR_ABT; |
| mode = MODE_ABORT; |
| break; |
| case 0x16: |
| regIdx = MISCREG_SPSR_UND; |
| mode = MODE_UNDEFINED; |
| break; |
| case 0x1C: |
| regIdx = MISCREG_SPSR_MON; |
| mode = MODE_MON; |
| break; |
| case 0x1E: |
| regIdx = MISCREG_SPSR_HYP; |
| mode = MODE_HYP; |
| break; |
| default: |
| ok = false; |
| break; |
| } |
| } else { |
| int sysM4To3 = bits(sysM, 4, 3); |
| |
| if (sysM4To3 == 0) { |
| mode = MODE_USER; |
| regIdx = int_reg::regInMode(mode, bits(sysM, 2, 0) + 8); |
| } else if (sysM4To3 == 1) { |
| mode = MODE_FIQ; |
| regIdx = int_reg::regInMode(mode, bits(sysM, 2, 0) + 8); |
| } else if (sysM4To3 == 3) { |
| if (bits(sysM, 1) == 0) { |
| mode = MODE_MON; |
| regIdx = int_reg::regInMode(mode, 14 - bits(sysM, 0)); |
| } else { |
| mode = MODE_HYP; |
| if (bits(sysM, 0) == 1) { |
| regIdx = int_reg::regInMode(mode, 13); // R13 in HYP |
| } else { |
| isIntReg = false; |
| regIdx = MISCREG_ELR_HYP; |
| } |
| } |
| } else { // Other Banked registers |
| int sysM2 = bits(sysM, 2); |
| int sysM1 = bits(sysM, 1); |
| |
| mode = (OperatingMode)(((sysM2 || sysM1) << 0) | |
| (1 << 1) | |
| ((sysM2 && !sysM1) << 2) | |
| ((sysM2 && sysM1) << 3) | |
| (1 << 4)); |
| regIdx = int_reg::regInMode(mode, 14 - bits(sysM, 0)); |
| // Don't flatten the register here. This is going to go through |
| // setReg() which will do the flattening |
| ok &= mode != cpsr.mode; |
| } |
| } |
| |
| // Check that the requested register is accessable from the current mode |
| if (ok && checkSecurity && mode != cpsr.mode) { |
| switch (cpsr.mode) { |
| case MODE_USER: |
| ok = false; |
| break; |
| case MODE_FIQ: |
| ok &= mode != MODE_HYP; |
| ok &= (mode != MODE_MON) || !scr.ns; |
| break; |
| case MODE_HYP: |
| ok &= mode != MODE_MON; |
| ok &= (mode != MODE_FIQ) || !nsacr.rfr; |
| break; |
| case MODE_IRQ: |
| case MODE_SVC: |
| case MODE_ABORT: |
| case MODE_UNDEFINED: |
| case MODE_SYSTEM: |
| ok &= mode != MODE_HYP; |
| ok &= (mode != MODE_MON) || !scr.ns; |
| ok &= (mode != MODE_FIQ) || !nsacr.rfr; |
| break; |
| // can access everything, no further checks required |
| case MODE_MON: |
| break; |
| default: |
| panic("unknown Mode 0x%x\n", cpsr.mode); |
| break; |
| } |
| } |
| return ok; |
| } |
| |
| bool |
| isUnpriviledgeAccess(ThreadContext *tc) |
| { |
| const HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| const CPSR cpsr = tc->readMiscReg(MISCREG_CPSR); |
| |
| // NV Extension not implemented yet |
| bool have_nv_ext = false; |
| bool unpriv_el1 = currEL(tc) == EL1 && |
| !(ArmSystem::haveEL(tc, EL2) && |
| have_nv_ext && hcr.nv == 1 && hcr.nv1 == 1); |
| bool unpriv_el2 = ArmSystem::haveEL(tc, EL2) && |
| HaveExt(tc, ArmExtension::FEAT_VHE) && |
| currEL(tc) == EL2 && hcr.e2h == 1 && hcr.tge == 1; |
| |
| return (unpriv_el1 || unpriv_el2) && !cpsr.uao; |
| } |
| |
| bool |
| SPAlignmentCheckEnabled(ThreadContext *tc) |
| { |
| ExceptionLevel regime = s1TranslationRegime(tc, currEL(tc)); |
| |
| switch (currEL(tc)) { |
| case EL3: |
| return ((SCTLR)tc->readMiscReg(MISCREG_SCTLR_EL3)).sa; |
| case EL2: |
| return ((SCTLR)tc->readMiscReg(MISCREG_SCTLR_EL2)).sa; |
| case EL1: |
| return ((SCTLR)tc->readMiscReg(MISCREG_SCTLR_EL1)).sa; |
| case EL0: |
| { |
| SCTLR sc = (regime == EL2) ? tc->readMiscReg(MISCREG_SCTLR_EL2): |
| tc->readMiscReg(MISCREG_SCTLR_EL1); |
| return sc.sa0; |
| } |
| default: |
| panic("Invalid exception level"); |
| break; |
| } |
| } |
| |
| int |
| decodePhysAddrRange64(uint8_t pa_enc) |
| { |
| switch (pa_enc) { |
| case 0x0: |
| return 32; |
| case 0x1: |
| return 36; |
| case 0x2: |
| return 40; |
| case 0x3: |
| return 42; |
| case 0x4: |
| return 44; |
| case 0x5: |
| return 48; |
| case 0x6: |
| return 52; |
| default: |
| panic("Invalid phys. address range encoding"); |
| } |
| } |
| |
| uint8_t |
| encodePhysAddrRange64(int pa_size) |
| { |
| switch (pa_size) { |
| case 32: |
| return 0x0; |
| case 36: |
| return 0x1; |
| case 40: |
| return 0x2; |
| case 42: |
| return 0x3; |
| case 44: |
| return 0x4; |
| case 48: |
| return 0x5; |
| case 52: |
| return 0x6; |
| default: |
| panic("Invalid phys. address range"); |
| } |
| } |
| |
| void |
| syncVecRegsToElems(ThreadContext *tc) |
| { |
| int ei = 0; |
| for (int ri = 0; ri < NumVecRegs; ri++) { |
| VecRegContainer reg; |
| tc->getReg(vecRegClass[ri], ®); |
| for (int j = 0; j < NumVecElemPerVecReg; j++, ei++) |
| tc->setReg(vecElemClass[ei], reg.as<VecElem>()[j]); |
| } |
| } |
| |
| void |
| syncVecElemsToRegs(ThreadContext *tc) |
| { |
| int ei = 0; |
| for (int ri = 0; ri < NumVecRegs; ri++) { |
| VecRegContainer reg; |
| for (int j = 0; j < NumVecElemPerVecReg; j++, ei++) { |
| RegId elem_id = vecElemClass[ei]; |
| reg.as<VecElem>()[j] = tc->getReg(elem_id); |
| } |
| tc->setReg(vecRegClass[ri], ®); |
| } |
| } |
| |
| } // namespace ArmISA |
| } // namespace gem5 |
