| /* |
| * Copyright (c) 2009-2014, 2016-2018 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. |
| * |
| * Authors: Ali Saidi |
| */ |
| |
| #include "arch/arm/utility.hh" |
| |
| #include <memory> |
| |
| #include "arch/arm/faults.hh" |
| #include "arch/arm/isa_traits.hh" |
| #include "arch/arm/system.hh" |
| #include "arch/arm/tlb.hh" |
| #include "arch/arm/vtophys.hh" |
| #include "cpu/base.hh" |
| #include "cpu/checker/cpu.hh" |
| #include "cpu/thread_context.hh" |
| #include "mem/fs_translating_port_proxy.hh" |
| #include "sim/full_system.hh" |
| |
| namespace ArmISA { |
| |
| void |
| initCPU(ThreadContext *tc, int cpuId) |
| { |
| // Reset CP15?? What does that mean -- ali |
| |
| // FPEXC.EN = 0 |
| |
| static Fault reset = std::make_shared<Reset>(); |
| reset->invoke(tc); |
| } |
| |
| uint64_t |
| getArgument(ThreadContext *tc, int &number, uint16_t size, bool fp) |
| { |
| if (!FullSystem) { |
| panic("getArgument() only implemented for full system mode.\n"); |
| M5_DUMMY_RETURN |
| } |
| |
| if (fp) |
| panic("getArgument(): Floating point arguments not implemented\n"); |
| |
| if (inAArch64(tc)) { |
| if (size == (uint16_t)(-1)) |
| size = sizeof(uint64_t); |
| |
| if (number < 8 /*NumArgumentRegs64*/) { |
| return tc->readIntReg(number); |
| } else { |
| panic("getArgument(): No support reading stack args for AArch64\n"); |
| } |
| } else { |
| if (size == (uint16_t)(-1)) |
| // todo: should this not be sizeof(uint32_t) rather? |
| size = ArmISA::MachineBytes; |
| |
| if (number < NumArgumentRegs) { |
| // If the argument is 64 bits, it must be in an even regiser |
| // number. Increment the number here if it isn't even. |
| if (size == sizeof(uint64_t)) { |
| if ((number % 2) != 0) |
| number++; |
| // Read the two halves of the data. Number is inc here to |
| // get the second half of the 64 bit reg. |
| uint64_t tmp; |
| tmp = tc->readIntReg(number++); |
| tmp |= tc->readIntReg(number) << 32; |
| return tmp; |
| } else { |
| return tc->readIntReg(number); |
| } |
| } else { |
| Addr sp = tc->readIntReg(StackPointerReg); |
| FSTranslatingPortProxy &vp = tc->getVirtProxy(); |
| uint64_t arg; |
| if (size == sizeof(uint64_t)) { |
| // If the argument is even it must be aligned |
| if ((number % 2) != 0) |
| number++; |
| arg = vp.read<uint64_t>(sp + |
| (number-NumArgumentRegs) * sizeof(uint32_t)); |
| // since two 32 bit args == 1 64 bit arg, increment number |
| number++; |
| } else { |
| arg = vp.read<uint32_t>(sp + |
| (number-NumArgumentRegs) * sizeof(uint32_t)); |
| } |
| return arg; |
| } |
| } |
| panic("getArgument() should always return\n"); |
| } |
| |
| void |
| skipFunction(ThreadContext *tc) |
| { |
| PCState newPC = tc->pcState(); |
| if (inAArch64(tc)) { |
| newPC.set(tc->readIntReg(INTREG_X30)); |
| } else { |
| newPC.set(tc->readIntReg(ReturnAddressReg) & ~ULL(1)); |
| } |
| |
| CheckerCPU *checker = tc->getCheckerCpuPtr(); |
| if (checker) { |
| tc->pcStateNoRecord(newPC); |
| } else { |
| tc->pcState(newPC); |
| } |
| } |
| |
| static void |
| copyVecRegs(ThreadContext *src, ThreadContext *dest) |
| { |
| auto src_mode = RenameMode<ArmISA::ISA>::mode(src->pcState()); |
| |
| // The way vector registers are copied (VecReg vs VecElem) is relevant |
| // in the O3 model only. |
| if (src_mode == Enums::Full) { |
| for (auto idx = 0; idx < NumVecRegs; idx++) |
| dest->setVecRegFlat(idx, src->readVecRegFlat(idx)); |
| } else { |
| for (auto idx = 0; idx < NumVecRegs; idx++) |
| for (auto elem_idx = 0; elem_idx < NumVecElemPerVecReg; elem_idx++) |
| dest->setVecElemFlat( |
| idx, elem_idx, src->readVecElemFlat(idx, elem_idx)); |
| } |
| } |
| |
| void |
| copyRegs(ThreadContext *src, ThreadContext *dest) |
| { |
| for (int i = 0; i < NumIntRegs; i++) |
| dest->setIntRegFlat(i, src->readIntRegFlat(i)); |
| |
| for (int i = 0; i < NumFloatRegs; i++) |
| dest->setFloatRegFlat(i, src->readFloatRegFlat(i)); |
| |
| for (int i = 0; i < NumCCRegs; i++) |
| dest->setCCReg(i, src->readCCReg(i)); |
| |
| for (int i = 0; i < NumMiscRegs; i++) |
| dest->setMiscRegNoEffect(i, src->readMiscRegNoEffect(i)); |
| |
| copyVecRegs(src, dest); |
| |
| // setMiscReg "with effect" will set the misc register mapping correctly. |
| // e.g. updateRegMap(val) |
| dest->setMiscReg(MISCREG_CPSR, src->readMiscRegNoEffect(MISCREG_CPSR)); |
| |
| // Copy over the PC State |
| dest->pcState(src->pcState()); |
| |
| // Invalidate the tlb misc register cache |
| dynamic_cast<TLB *>(dest->getITBPtr())->invalidateMiscReg(); |
| dynamic_cast<TLB *>(dest->getDTBPtr())->invalidateMiscReg(); |
| } |
| |
| bool |
| inSecureState(ThreadContext *tc) |
| { |
| SCR scr = inAArch64(tc) ? tc->readMiscReg(MISCREG_SCR_EL3) : |
| tc->readMiscReg(MISCREG_SCR); |
| return ArmSystem::haveSecurity(tc) && inSecureState( |
| scr, tc->readMiscReg(MISCREG_CPSR)); |
| } |
| |
| inline bool |
| isSecureBelowEL3(ThreadContext *tc) |
| { |
| SCR scr = tc->readMiscReg(MISCREG_SCR_EL3); |
| return ArmSystem::haveEL(tc, EL3) && scr.ns == 0; |
| } |
| |
| bool |
| inAArch64(ThreadContext *tc) |
| { |
| CPSR cpsr = tc->readMiscReg(MISCREG_CPSR); |
| return opModeIs64((OperatingMode) (uint8_t) cpsr.mode); |
| } |
| |
| bool |
| longDescFormatInUse(ThreadContext *tc) |
| { |
| TTBCR ttbcr = tc->readMiscReg(MISCREG_TTBCR); |
| return ArmSystem::haveLPAE(tc) && ttbcr.eae; |
| } |
| |
| RegVal |
| readMPIDR(ArmSystem *arm_sys, ThreadContext *tc) |
| { |
| CPSR cpsr = tc->readMiscReg(MISCREG_CPSR); |
| const ExceptionLevel current_el = |
| opModeToEL((OperatingMode) (uint8_t) cpsr.mode); |
| |
| 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"); |
| M5_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); |
| if (arm_sys->multiThread) { |
| return 0x80000000 | // multiprocessor extensions available |
| 0x01000000 | // multi-threaded cores |
| tc->contextId(); |
| } else if (arm_sys->multiProc) { |
| return 0x80000000 | // multiprocessor extensions available |
| tc->cpuId() | tc->socketId() << 8; |
| } else { |
| return 0x80000000 | // multiprocessor extensions available |
| 0x40000000 | // in up system |
| tc->cpuId() | tc->socketId() << 8; |
| } |
| } |
| |
| bool |
| ELIs64(ThreadContext *tc, ExceptionLevel el) |
| { |
| return !ELIs32(tc, el); |
| } |
| |
| bool |
| ELIs32(ThreadContext *tc, ExceptionLevel el) |
| { |
| bool known, aarch32; |
| std::tie(known, aarch32) = ELUsingAArch32K(tc, el); |
| panic_if(!known, "EL state is UNKNOWN"); |
| return aarch32; |
| } |
| |
| bool |
| ELIsInHost(ThreadContext *tc, ExceptionLevel el) |
| { |
| if (!ArmSystem::haveVirtualization(tc)) { |
| return false; |
| } |
| HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| return (!isSecureBelowEL3(tc) && !ELIs32(tc, EL2) && hcr.e2h == 1 && |
| (el == EL2 || (el == EL0 && hcr.tge == 1))); |
| } |
| |
| std::pair<bool, bool> |
| ELUsingAArch32K(ThreadContext *tc, ExceptionLevel el) |
| { |
| // Return true if the specified EL is in aarch32 state. |
| const bool have_el3 = ArmSystem::haveSecurity(tc); |
| const bool have_el2 = ArmSystem::haveVirtualization(tc); |
| |
| 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 (ArmSystem::highestELIs64(tc) && ArmSystem::highestEL(tc) == el) { |
| // Target EL is the highest one in a system where |
| // the highest is using AArch64. |
| known = true; aarch32 = false; |
| } else if (!ArmSystem::highestELIs64(tc)) { |
| // All ELs are using AArch32: |
| known = true; aarch32 = true; |
| } else { |
| SCR scr = tc->readMiscReg(MISCREG_SCR_EL3); |
| bool aarch32_below_el3 = (have_el3 && scr.rw == 0); |
| |
| HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| bool aarch32_at_el1 = (aarch32_below_el3 |
| || (have_el2 |
| && !isSecureBelowEL3(tc) && hcr.rw == 0)); |
| |
| // 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 = (cpsr.el == 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 |
| isBigEndian64(ThreadContext *tc) |
| { |
| switch (opModeToEL(currOpMode(tc))) { |
| case EL3: |
| return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL3)).ee; |
| case EL2: |
| return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL2)).ee; |
| case EL1: |
| return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL1)).ee; |
| case EL0: |
| return ((SCTLR) tc->readMiscReg(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)); |
| } |
| |
| Addr |
| purifyTaggedAddr(Addr addr, ThreadContext *tc, ExceptionLevel el, |
| TTBCR tcr) |
| { |
| switch (el) { |
| case EL0: |
| case EL1: |
| if (bits(addr, 55, 48) == 0xFF && tcr.tbi1) |
| return addr | mask(63, 55); |
| else if (!bits(addr, 55, 48) && tcr.tbi0) |
| return bits(addr,55, 0); |
| break; |
| case EL2: |
| assert(ArmSystem::haveVirtualization(tc)); |
| tcr = tc->readMiscReg(MISCREG_TCR_EL2); |
| if (tcr.tbi) |
| return addr & mask(56); |
| break; |
| case EL3: |
| assert(ArmSystem::haveSecurity(tc)); |
| if (tcr.tbi) |
| return addr & mask(56); |
| break; |
| default: |
| panic("Invalid exception level"); |
| break; |
| } |
| |
| return addr; // Nothing to do if this is not a tagged address |
| } |
| |
| Addr |
| purifyTaggedAddr(Addr addr, ThreadContext *tc, ExceptionLevel el) |
| { |
| TTBCR tcr; |
| |
| switch (el) { |
| case EL0: |
| case EL1: |
| tcr = tc->readMiscReg(MISCREG_TCR_EL1); |
| if (bits(addr, 55, 48) == 0xFF && tcr.tbi1) |
| return addr | mask(63, 55); |
| else if (!bits(addr, 55, 48) && tcr.tbi0) |
| return bits(addr,55, 0); |
| break; |
| case EL2: |
| assert(ArmSystem::haveVirtualization(tc)); |
| tcr = tc->readMiscReg(MISCREG_TCR_EL2); |
| if (tcr.tbi) |
| return addr & mask(56); |
| break; |
| case EL3: |
| assert(ArmSystem::haveSecurity(tc)); |
| tcr = tc->readMiscReg(MISCREG_TCR_EL3); |
| if (tcr.tbi) |
| return addr & mask(56); |
| break; |
| default: |
| panic("Invalid exception level"); |
| break; |
| } |
| |
| return addr; // Nothing to do if this is not a tagged address |
| } |
| |
| Addr |
| truncPage(Addr addr) |
| { |
| return addr & ~(PageBytes - 1); |
| } |
| |
| Addr |
| roundPage(Addr addr) |
| { |
| return (addr + PageBytes - 1) & ~(PageBytes - 1); |
| } |
| |
| bool |
| mcrMrc15TrapToHyp(const MiscRegIndex miscReg, HCR hcr, CPSR cpsr, SCR scr, |
| HDCR hdcr, HSTR hstr, HCPTR hcptr, uint32_t iss) |
| { |
| bool isRead; |
| uint32_t crm; |
| IntRegIndex rt; |
| uint32_t crn; |
| uint32_t opc1; |
| uint32_t opc2; |
| bool trapToHype = false; |
| |
| |
| if (!inSecureState(scr, cpsr) && (cpsr.mode != MODE_HYP)) { |
| mcrMrcIssExtract(iss, isRead, crm, rt, crn, opc1, opc2); |
| trapToHype = ((uint32_t) hstr) & (1 << crn); |
| trapToHype |= hdcr.tpm && (crn == 9) && (crm >= 12); |
| trapToHype |= 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 (!trapToHype) { |
| switch (unflattenMiscReg(miscReg)) { |
| case MISCREG_CPACR: |
| trapToHype = hcptr.tcpac; |
| break; |
| case MISCREG_REVIDR: |
| case MISCREG_TCMTR: |
| case MISCREG_TLBTR: |
| case MISCREG_AIDR: |
| trapToHype = hcr.tid1; |
| break; |
| case MISCREG_CTR: |
| case MISCREG_CCSIDR: |
| case MISCREG_CLIDR: |
| case MISCREG_CSSELR: |
| trapToHype = 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_ISAR0: |
| case MISCREG_ID_ISAR1: |
| case MISCREG_ID_ISAR2: |
| case MISCREG_ID_ISAR3: |
| case MISCREG_ID_ISAR4: |
| case MISCREG_ID_ISAR5: |
| trapToHype = hcr.tid3; |
| break; |
| case MISCREG_DCISW: |
| case MISCREG_DCCSW: |
| case MISCREG_DCCISW: |
| trapToHype = hcr.tsw; |
| break; |
| case MISCREG_DCIMVAC: |
| case MISCREG_DCCIMVAC: |
| case MISCREG_DCCMVAC: |
| trapToHype = hcr.tpc; |
| break; |
| case MISCREG_ICIMVAU: |
| case MISCREG_ICIALLU: |
| case MISCREG_ICIALLUIS: |
| case MISCREG_DCCMVAU: |
| trapToHype = 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: |
| trapToHype = hcr.ttlb; |
| break; |
| case MISCREG_ACTLR: |
| trapToHype = 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: |
| trapToHype = hcr.tvm & !isRead; |
| break; |
| case MISCREG_PMCR: |
| trapToHype = hdcr.tpmcr; |
| break; |
| // No default action needed |
| default: |
| break; |
| } |
| } |
| } |
| return trapToHype; |
| } |
| |
| |
| bool |
| mcrMrc14TrapToHyp(const MiscRegIndex miscReg, HCR hcr, CPSR cpsr, SCR scr, |
| HDCR hdcr, HSTR hstr, HCPTR hcptr, uint32_t iss) |
| { |
| bool isRead; |
| uint32_t crm; |
| IntRegIndex rt; |
| uint32_t crn; |
| uint32_t opc1; |
| uint32_t opc2; |
| bool trapToHype = false; |
| |
| if (!inSecureState(scr, cpsr) && (cpsr.mode != MODE_HYP)) { |
| mcrMrcIssExtract(iss, isRead, 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); |
| trapToHype = hdcr.tda && (opc1 == 0); |
| trapToHype |= hcptr.tta && (opc1 == 1); |
| if (!trapToHype) { |
| switch (unflattenMiscReg(miscReg)) { |
| case MISCREG_DBGOSLSR: |
| case MISCREG_DBGOSLAR: |
| case MISCREG_DBGOSDLR: |
| case MISCREG_DBGPRCR: |
| trapToHype = hdcr.tdosa; |
| break; |
| case MISCREG_DBGDRAR: |
| case MISCREG_DBGDSAR: |
| trapToHype = hdcr.tdra; |
| break; |
| case MISCREG_JIDR: |
| trapToHype = hcr.tid0; |
| break; |
| case MISCREG_JOSCR: |
| case MISCREG_JMCR: |
| trapToHype = hstr.tjdbx; |
| break; |
| case MISCREG_TEECR: |
| case MISCREG_TEEHBR: |
| trapToHype = hstr.ttee; |
| break; |
| // No default action needed |
| default: |
| break; |
| } |
| } |
| } |
| return trapToHype; |
| } |
| |
| bool |
| mcrrMrrc15TrapToHyp(const MiscRegIndex miscReg, CPSR cpsr, SCR scr, HSTR hstr, |
| HCR hcr, uint32_t iss) |
| { |
| uint32_t crm; |
| IntRegIndex rt; |
| uint32_t crn; |
| uint32_t opc1; |
| uint32_t opc2; |
| bool isRead; |
| bool trapToHype = false; |
| |
| if (!inSecureState(scr, cpsr) && (cpsr.mode != MODE_HYP)) { |
| // 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, isRead, crm, rt, crn, opc1, opc2); |
| trapToHype = ((uint32_t) hstr) & (1 << crm); |
| |
| if (!trapToHype) { |
| switch (unflattenMiscReg(miscReg)) { |
| 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: |
| trapToHype = hcr.tvm & !isRead; |
| break; |
| // No default action needed |
| default: |
| break; |
| } |
| } |
| } |
| return trapToHype; |
| } |
| |
| 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 = intRegInMode(mode, bits(sysM, 2, 0) + 8); |
| } else if (sysM4To3 == 1) { |
| mode = MODE_FIQ; |
| regIdx = intRegInMode(mode, bits(sysM, 2, 0) + 8); |
| } else if (sysM4To3 == 3) { |
| if (bits(sysM, 1) == 0) { |
| mode = MODE_MON; |
| regIdx = intRegInMode(mode, 14 - bits(sysM, 0)); |
| } else { |
| mode = MODE_HYP; |
| if (bits(sysM, 0) == 1) { |
| regIdx = intRegInMode(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 = intRegInMode(mode, 14 - bits(sysM, 0)); |
| // Don't flatten the register here. This is going to go through |
| // setIntReg() 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 |
| SPAlignmentCheckEnabled(ThreadContext* tc) |
| { |
| switch (opModeToEL(currOpMode(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: |
| return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL1)).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: |
| case 0x6: |
| case 0x7: |
| return 48; |
| 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; |
| default: |
| panic("Invalid phys. address range"); |
| } |
| } |
| |
| } // namespace ArmISA |
