| /* |
| * Copyright (c) 2010-2014, 2016-2018 ARM Limited |
| * Copyright (c) 2013 Advanced Micro Devices, Inc. |
| * 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. |
| * |
| * Copyright (c) 2007-2008 The Florida State University |
| * 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. |
| * |
| * Authors: Stephen Hines |
| */ |
| |
| #include "arch/arm/insts/static_inst.hh" |
| |
| #include "arch/arm/faults.hh" |
| #include "base/condcodes.hh" |
| #include "base/cprintf.hh" |
| #include "base/loader/symtab.hh" |
| #include "cpu/reg_class.hh" |
| |
| namespace ArmISA |
| { |
| // Shift Rm by an immediate value |
| int32_t |
| ArmStaticInst::shift_rm_imm(uint32_t base, uint32_t shamt, |
| uint32_t type, uint32_t cfval) const |
| { |
| assert(shamt < 32); |
| ArmShiftType shiftType; |
| shiftType = (ArmShiftType)type; |
| |
| switch (shiftType) |
| { |
| case LSL: |
| return base << shamt; |
| case LSR: |
| if (shamt == 0) |
| return 0; |
| else |
| return base >> shamt; |
| case ASR: |
| if (shamt == 0) |
| return (base >> 31) | -((base & (1 << 31)) >> 31); |
| else |
| return (base >> shamt) | -((base & (1 << 31)) >> shamt); |
| case ROR: |
| if (shamt == 0) |
| return (cfval << 31) | (base >> 1); // RRX |
| else |
| return (base << (32 - shamt)) | (base >> shamt); |
| default: |
| ccprintf(std::cerr, "Unhandled shift type\n"); |
| exit(1); |
| break; |
| } |
| return 0; |
| } |
| |
| int64_t |
| ArmStaticInst::shiftReg64(uint64_t base, uint64_t shiftAmt, |
| ArmShiftType type, uint8_t width) const |
| { |
| shiftAmt = shiftAmt % width; |
| ArmShiftType shiftType; |
| shiftType = (ArmShiftType)type; |
| |
| switch (shiftType) |
| { |
| case LSL: |
| return base << shiftAmt; |
| case LSR: |
| if (shiftAmt == 0) |
| return base; |
| else |
| return (base & mask(width)) >> shiftAmt; |
| case ASR: |
| if (shiftAmt == 0) { |
| return base; |
| } else { |
| int sign_bit = bits(base, intWidth - 1); |
| base >>= shiftAmt; |
| base = sign_bit ? (base | ~mask(intWidth - shiftAmt)) : base; |
| return base & mask(intWidth); |
| } |
| case ROR: |
| if (shiftAmt == 0) |
| return base; |
| else |
| return (base << (width - shiftAmt)) | (base >> shiftAmt); |
| default: |
| ccprintf(std::cerr, "Unhandled shift type\n"); |
| exit(1); |
| break; |
| } |
| return 0; |
| } |
| |
| int64_t |
| ArmStaticInst::extendReg64(uint64_t base, ArmExtendType type, |
| uint64_t shiftAmt, uint8_t width) const |
| { |
| bool sign_extend = false; |
| int len = 0; |
| switch (type) { |
| case UXTB: |
| len = 8; |
| break; |
| case UXTH: |
| len = 16; |
| break; |
| case UXTW: |
| len = 32; |
| break; |
| case UXTX: |
| len = 64; |
| break; |
| case SXTB: |
| len = 8; |
| sign_extend = true; |
| break; |
| case SXTH: |
| len = 16; |
| sign_extend = true; |
| break; |
| case SXTW: |
| len = 32; |
| sign_extend = true; |
| break; |
| case SXTX: |
| len = 64; |
| sign_extend = true; |
| break; |
| } |
| len = len <= width - shiftAmt ? len : width - shiftAmt; |
| uint64_t tmp = (uint64_t) bits(base, len - 1, 0) << shiftAmt; |
| if (sign_extend) { |
| int sign_bit = bits(tmp, len + shiftAmt - 1); |
| tmp = sign_bit ? (tmp | ~mask(len + shiftAmt)) : tmp; |
| } |
| return tmp & mask(width); |
| } |
| |
| // Shift Rm by Rs |
| int32_t |
| ArmStaticInst::shift_rm_rs(uint32_t base, uint32_t shamt, |
| uint32_t type, uint32_t cfval) const |
| { |
| enum ArmShiftType shiftType; |
| shiftType = (enum ArmShiftType) type; |
| |
| switch (shiftType) |
| { |
| case LSL: |
| if (shamt >= 32) |
| return 0; |
| else |
| return base << shamt; |
| case LSR: |
| if (shamt >= 32) |
| return 0; |
| else |
| return base >> shamt; |
| case ASR: |
| if (shamt >= 32) |
| return (base >> 31) | -((base & (1 << 31)) >> 31); |
| else |
| return (base >> shamt) | -((base & (1 << 31)) >> shamt); |
| case ROR: |
| shamt = shamt & 0x1f; |
| if (shamt == 0) |
| return base; |
| else |
| return (base << (32 - shamt)) | (base >> shamt); |
| default: |
| ccprintf(std::cerr, "Unhandled shift type\n"); |
| exit(1); |
| break; |
| } |
| return 0; |
| } |
| |
| |
| // Generate C for a shift by immediate |
| bool |
| ArmStaticInst::shift_carry_imm(uint32_t base, uint32_t shamt, |
| uint32_t type, uint32_t cfval) const |
| { |
| enum ArmShiftType shiftType; |
| shiftType = (enum ArmShiftType) type; |
| |
| switch (shiftType) |
| { |
| case LSL: |
| if (shamt == 0) |
| return cfval; |
| else |
| return (base >> (32 - shamt)) & 1; |
| case LSR: |
| if (shamt == 0) |
| return (base >> 31); |
| else |
| return (base >> (shamt - 1)) & 1; |
| case ASR: |
| if (shamt == 0) |
| return (base >> 31); |
| else |
| return (base >> (shamt - 1)) & 1; |
| case ROR: |
| shamt = shamt & 0x1f; |
| if (shamt == 0) |
| return (base & 1); // RRX |
| else |
| return (base >> (shamt - 1)) & 1; |
| default: |
| ccprintf(std::cerr, "Unhandled shift type\n"); |
| exit(1); |
| break; |
| } |
| return 0; |
| } |
| |
| |
| // Generate C for a shift by Rs |
| bool |
| ArmStaticInst::shift_carry_rs(uint32_t base, uint32_t shamt, |
| uint32_t type, uint32_t cfval) const |
| { |
| enum ArmShiftType shiftType; |
| shiftType = (enum ArmShiftType) type; |
| |
| if (shamt == 0) |
| return cfval; |
| |
| switch (shiftType) |
| { |
| case LSL: |
| if (shamt > 32) |
| return 0; |
| else |
| return (base >> (32 - shamt)) & 1; |
| case LSR: |
| if (shamt > 32) |
| return 0; |
| else |
| return (base >> (shamt - 1)) & 1; |
| case ASR: |
| if (shamt > 32) |
| shamt = 32; |
| return (base >> (shamt - 1)) & 1; |
| case ROR: |
| shamt = shamt & 0x1f; |
| if (shamt == 0) |
| shamt = 32; |
| return (base >> (shamt - 1)) & 1; |
| default: |
| ccprintf(std::cerr, "Unhandled shift type\n"); |
| exit(1); |
| break; |
| } |
| return 0; |
| } |
| |
| void |
| ArmStaticInst::printIntReg(std::ostream &os, RegIndex reg_idx) const |
| { |
| if (aarch64) { |
| if (reg_idx == INTREG_UREG0) |
| ccprintf(os, "ureg0"); |
| else if (reg_idx == INTREG_SPX) |
| ccprintf(os, "%s%s", (intWidth == 32) ? "w" : "", "sp"); |
| else if (reg_idx == INTREG_X31) |
| ccprintf(os, "%szr", (intWidth == 32) ? "w" : "x"); |
| else |
| ccprintf(os, "%s%d", (intWidth == 32) ? "w" : "x", reg_idx); |
| } else { |
| switch (reg_idx) { |
| case PCReg: |
| ccprintf(os, "pc"); |
| break; |
| case StackPointerReg: |
| ccprintf(os, "sp"); |
| break; |
| case FramePointerReg: |
| ccprintf(os, "fp"); |
| break; |
| case ReturnAddressReg: |
| ccprintf(os, "lr"); |
| break; |
| default: |
| ccprintf(os, "r%d", reg_idx); |
| break; |
| } |
| } |
| } |
| |
| void |
| ArmStaticInst::printFloatReg(std::ostream &os, RegIndex reg_idx) const |
| { |
| ccprintf(os, "f%d", reg_idx); |
| } |
| |
| void |
| ArmStaticInst::printVecReg(std::ostream &os, RegIndex reg_idx) const |
| { |
| ccprintf(os, "v%d", reg_idx); |
| } |
| |
| void |
| ArmStaticInst::printCCReg(std::ostream &os, RegIndex reg_idx) const |
| { |
| ccprintf(os, "cc_%s", ArmISA::ccRegName[reg_idx]); |
| } |
| |
| void |
| ArmStaticInst::printMiscReg(std::ostream &os, RegIndex reg_idx) const |
| { |
| assert(reg_idx < NUM_MISCREGS); |
| ccprintf(os, "%s", ArmISA::miscRegName[reg_idx]); |
| } |
| |
| void |
| ArmStaticInst::printMnemonic(std::ostream &os, |
| const std::string &suffix, |
| bool withPred, |
| bool withCond64, |
| ConditionCode cond64) const |
| { |
| os << " " << mnemonic; |
| if (withPred && !aarch64) { |
| printCondition(os, machInst.condCode); |
| os << suffix; |
| } else if (withCond64) { |
| os << "."; |
| printCondition(os, cond64); |
| os << suffix; |
| } |
| if (machInst.bigThumb) |
| os << ".w"; |
| os << " "; |
| } |
| |
| void |
| ArmStaticInst::printTarget(std::ostream &os, Addr target, |
| const SymbolTable *symtab) const |
| { |
| Addr symbolAddr; |
| std::string symbol; |
| |
| if (symtab && symtab->findNearestSymbol(target, symbol, symbolAddr)) { |
| ccprintf(os, "<%s", symbol); |
| if (symbolAddr != target) |
| ccprintf(os, "+%d>", target - symbolAddr); |
| else |
| ccprintf(os, ">"); |
| } else { |
| ccprintf(os, "%#x", target); |
| } |
| } |
| |
| void |
| ArmStaticInst::printCondition(std::ostream &os, |
| unsigned code, |
| bool noImplicit) const |
| { |
| switch (code) { |
| case COND_EQ: |
| os << "eq"; |
| break; |
| case COND_NE: |
| os << "ne"; |
| break; |
| case COND_CS: |
| os << "cs"; |
| break; |
| case COND_CC: |
| os << "cc"; |
| break; |
| case COND_MI: |
| os << "mi"; |
| break; |
| case COND_PL: |
| os << "pl"; |
| break; |
| case COND_VS: |
| os << "vs"; |
| break; |
| case COND_VC: |
| os << "vc"; |
| break; |
| case COND_HI: |
| os << "hi"; |
| break; |
| case COND_LS: |
| os << "ls"; |
| break; |
| case COND_GE: |
| os << "ge"; |
| break; |
| case COND_LT: |
| os << "lt"; |
| break; |
| case COND_GT: |
| os << "gt"; |
| break; |
| case COND_LE: |
| os << "le"; |
| break; |
| case COND_AL: |
| // This one is implicit. |
| if (noImplicit) |
| os << "al"; |
| break; |
| case COND_UC: |
| // Unconditional. |
| if (noImplicit) |
| os << "uc"; |
| break; |
| default: |
| panic("Unrecognized condition code %d.\n", code); |
| } |
| } |
| |
| void |
| ArmStaticInst::printMemSymbol(std::ostream &os, |
| const SymbolTable *symtab, |
| const std::string &prefix, |
| const Addr addr, |
| const std::string &suffix) const |
| { |
| Addr symbolAddr; |
| std::string symbol; |
| if (symtab && symtab->findNearestSymbol(addr, symbol, symbolAddr)) { |
| ccprintf(os, "%s%s", prefix, symbol); |
| if (symbolAddr != addr) |
| ccprintf(os, "+%d", addr - symbolAddr); |
| ccprintf(os, suffix); |
| } |
| } |
| |
| void |
| ArmStaticInst::printShiftOperand(std::ostream &os, |
| IntRegIndex rm, |
| bool immShift, |
| uint32_t shiftAmt, |
| IntRegIndex rs, |
| ArmShiftType type) const |
| { |
| bool firstOp = false; |
| |
| if (rm != INTREG_ZERO) { |
| printIntReg(os, rm); |
| } |
| |
| bool done = false; |
| |
| if ((type == LSR || type == ASR) && immShift && shiftAmt == 0) |
| shiftAmt = 32; |
| |
| switch (type) { |
| case LSL: |
| if (immShift && shiftAmt == 0) { |
| done = true; |
| break; |
| } |
| if (!firstOp) |
| os << ", "; |
| os << "LSL"; |
| break; |
| case LSR: |
| if (!firstOp) |
| os << ", "; |
| os << "LSR"; |
| break; |
| case ASR: |
| if (!firstOp) |
| os << ", "; |
| os << "ASR"; |
| break; |
| case ROR: |
| if (immShift && shiftAmt == 0) { |
| if (!firstOp) |
| os << ", "; |
| os << "RRX"; |
| done = true; |
| break; |
| } |
| if (!firstOp) |
| os << ", "; |
| os << "ROR"; |
| break; |
| default: |
| panic("Tried to disassemble unrecognized shift type.\n"); |
| } |
| if (!done) { |
| if (!firstOp) |
| os << " "; |
| if (immShift) |
| os << "#" << shiftAmt; |
| else |
| printIntReg(os, rs); |
| } |
| } |
| |
| void |
| ArmStaticInst::printExtendOperand(bool firstOperand, std::ostream &os, |
| IntRegIndex rm, ArmExtendType type, |
| int64_t shiftAmt) const |
| { |
| if (!firstOperand) |
| ccprintf(os, ", "); |
| printIntReg(os, rm); |
| if (type == UXTX && shiftAmt == 0) |
| return; |
| switch (type) { |
| case UXTB: ccprintf(os, ", UXTB"); |
| break; |
| case UXTH: ccprintf(os, ", UXTH"); |
| break; |
| case UXTW: ccprintf(os, ", UXTW"); |
| break; |
| case UXTX: ccprintf(os, ", LSL"); |
| break; |
| case SXTB: ccprintf(os, ", SXTB"); |
| break; |
| case SXTH: ccprintf(os, ", SXTH"); |
| break; |
| case SXTW: ccprintf(os, ", SXTW"); |
| break; |
| case SXTX: ccprintf(os, ", SXTW"); |
| break; |
| } |
| if (type == UXTX || shiftAmt) |
| ccprintf(os, " #%d", shiftAmt); |
| } |
| |
| void |
| ArmStaticInst::printDataInst(std::ostream &os, bool withImm, |
| bool immShift, bool s, IntRegIndex rd, IntRegIndex rn, |
| IntRegIndex rm, IntRegIndex rs, uint32_t shiftAmt, |
| ArmShiftType type, uint64_t imm) const |
| { |
| printMnemonic(os, s ? "s" : ""); |
| bool firstOp = true; |
| |
| // Destination |
| if (rd != INTREG_ZERO) { |
| firstOp = false; |
| printIntReg(os, rd); |
| } |
| |
| // Source 1. |
| if (rn != INTREG_ZERO) { |
| if (!firstOp) |
| os << ", "; |
| firstOp = false; |
| printIntReg(os, rn); |
| } |
| |
| if (!firstOp) |
| os << ", "; |
| if (withImm) { |
| ccprintf(os, "#%ld", imm); |
| } else { |
| printShiftOperand(os, rm, immShift, shiftAmt, rs, type); |
| } |
| } |
| |
| std::string |
| ArmStaticInst::generateDisassembly(Addr pc, |
| const SymbolTable *symtab) const |
| { |
| std::stringstream ss; |
| printMnemonic(ss); |
| return ss.str(); |
| } |
| |
| |
| Fault |
| ArmStaticInst::advSIMDFPAccessTrap64(ExceptionLevel el) const |
| { |
| switch (el) { |
| case EL1: |
| return std::make_shared<SupervisorTrap>(machInst, 0x1E00000, |
| EC_TRAPPED_SIMD_FP); |
| case EL2: |
| return std::make_shared<HypervisorTrap>(machInst, 0x1E00000, |
| EC_TRAPPED_SIMD_FP); |
| case EL3: |
| return std::make_shared<SecureMonitorTrap>(machInst, 0x1E00000, |
| EC_TRAPPED_SIMD_FP); |
| |
| default: |
| panic("Illegal EL in advSIMDFPAccessTrap64\n"); |
| } |
| } |
| |
| |
| Fault |
| ArmStaticInst::checkFPAdvSIMDTrap64(ThreadContext *tc, CPSR cpsr) const |
| { |
| if (ArmSystem::haveVirtualization(tc) && !inSecureState(tc)) { |
| HCPTR cptrEnCheck = tc->readMiscReg(MISCREG_CPTR_EL2); |
| if (cptrEnCheck.tfp) |
| return advSIMDFPAccessTrap64(EL2); |
| } |
| |
| if (ArmSystem::haveSecurity(tc)) { |
| HCPTR cptrEnCheck = tc->readMiscReg(MISCREG_CPTR_EL3); |
| if (cptrEnCheck.tfp) |
| return advSIMDFPAccessTrap64(EL3); |
| } |
| |
| return NoFault; |
| } |
| |
| Fault |
| ArmStaticInst::checkFPAdvSIMDEnabled64(ThreadContext *tc, |
| CPSR cpsr, CPACR cpacr) const |
| { |
| const ExceptionLevel el = (ExceptionLevel) (uint8_t)cpsr.el; |
| if ((el == EL0 && cpacr.fpen != 0x3) || |
| (el == EL1 && !(cpacr.fpen & 0x1))) |
| return advSIMDFPAccessTrap64(EL1); |
| |
| return checkFPAdvSIMDTrap64(tc, cpsr); |
| } |
| |
| Fault |
| ArmStaticInst::checkAdvSIMDOrFPEnabled32(ThreadContext *tc, |
| CPSR cpsr, CPACR cpacr, |
| NSACR nsacr, FPEXC fpexc, |
| bool fpexc_check, bool advsimd) const |
| { |
| const bool have_virtualization = ArmSystem::haveVirtualization(tc); |
| const bool have_security = ArmSystem::haveSecurity(tc); |
| const bool is_secure = inSecureState(tc); |
| const ExceptionLevel cur_el = opModeToEL(currOpMode(tc)); |
| |
| if (cur_el == EL0 && ELIs64(tc, EL1)) |
| return checkFPAdvSIMDEnabled64(tc, cpsr, cpacr); |
| |
| uint8_t cpacr_cp10 = cpacr.cp10; |
| bool cpacr_asedis = cpacr.asedis; |
| |
| if (have_security && !ELIs64(tc, EL3) && !is_secure) { |
| if (nsacr.nsasedis) |
| cpacr_asedis = true; |
| if (nsacr.cp10 == 0) |
| cpacr_cp10 = 0; |
| } |
| |
| if (cur_el != EL2) { |
| if (advsimd && cpacr_asedis) |
| return disabledFault(); |
| |
| if ((cur_el == EL0 && cpacr_cp10 != 0x3) || |
| (cur_el != EL0 && !(cpacr_cp10 & 0x1))) |
| return disabledFault(); |
| } |
| |
| if (fpexc_check && !fpexc.en) |
| return disabledFault(); |
| |
| // -- aarch32/exceptions/traps/AArch32.CheckFPAdvSIMDTrap -- |
| |
| if (have_virtualization && !is_secure && ELIs64(tc, EL2)) |
| return checkFPAdvSIMDTrap64(tc, cpsr); |
| |
| if (have_virtualization && !is_secure) { |
| HCPTR hcptr = tc->readMiscReg(MISCREG_HCPTR); |
| bool hcptr_cp10 = hcptr.tcp10; |
| bool hcptr_tase = hcptr.tase; |
| |
| if (have_security && !ELIs64(tc, EL3) && !is_secure) { |
| if (nsacr.nsasedis) |
| hcptr_tase = true; |
| if (nsacr.cp10) |
| hcptr_cp10 = true; |
| } |
| |
| if ((advsimd && hcptr_tase) || hcptr_cp10) { |
| const uint32_t iss = advsimd ? (1 << 5) : 0xA; |
| if (cur_el == EL2) { |
| return std::make_shared<UndefinedInstruction>( |
| machInst, iss, |
| EC_TRAPPED_HCPTR, mnemonic); |
| } else { |
| return std::make_shared<HypervisorTrap>( |
| machInst, iss, |
| EC_TRAPPED_HCPTR); |
| } |
| |
| } |
| } |
| |
| if (have_security && ELIs64(tc, EL3)) { |
| HCPTR cptrEnCheck = tc->readMiscReg(MISCREG_CPTR_EL3); |
| if (cptrEnCheck.tfp) |
| return advSIMDFPAccessTrap64(EL3); |
| } |
| |
| return NoFault; |
| } |
| |
| inline bool |
| ArmStaticInst::isWFxTrapping(ThreadContext *tc, |
| ExceptionLevel tgtEl, |
| bool isWfe) const |
| { |
| bool trap = false; |
| SCTLR sctlr = ((SCTLR)tc->readMiscReg(MISCREG_SCTLR_EL1)); |
| HCR hcr = ((HCR)tc->readMiscReg(MISCREG_HCR_EL2)); |
| SCR scr = ((SCR)tc->readMiscReg(MISCREG_SCR_EL3)); |
| |
| switch (tgtEl) { |
| case EL1: |
| trap = isWfe? !sctlr.ntwe : !sctlr.ntwi; |
| break; |
| case EL2: |
| trap = isWfe? hcr.twe : hcr.twi; |
| break; |
| case EL3: |
| trap = isWfe? scr.twe : scr.twi; |
| break; |
| default: |
| break; |
| } |
| |
| return trap; |
| } |
| |
| Fault |
| ArmStaticInst::checkForWFxTrap32(ThreadContext *tc, |
| ExceptionLevel targetEL, |
| bool isWfe) const |
| { |
| // Check if target exception level is implemented. |
| assert(ArmSystem::haveEL(tc, targetEL)); |
| |
| // Check for routing to AArch64: this happens if the |
| // target exception level (where the trap will be handled) |
| // is using aarch64 |
| if (ELIs64(tc, targetEL)) { |
| return checkForWFxTrap64(tc, targetEL, isWfe); |
| } |
| |
| // Check if processor needs to trap at selected exception level |
| bool trap = isWFxTrapping(tc, targetEL, isWfe); |
| |
| if (trap) { |
| uint32_t iss = isWfe? 0x1E00001 : /* WFE Instruction syndrome */ |
| 0x1E00000; /* WFI Instruction syndrome */ |
| switch (targetEL) { |
| case EL1: |
| return std::make_shared<UndefinedInstruction>( |
| machInst, iss, |
| EC_TRAPPED_WFI_WFE, mnemonic); |
| case EL2: |
| return std::make_shared<HypervisorTrap>(machInst, iss, |
| EC_TRAPPED_WFI_WFE); |
| case EL3: |
| return std::make_shared<SecureMonitorTrap>(machInst, iss, |
| EC_TRAPPED_WFI_WFE); |
| default: |
| panic("Unrecognized Exception Level: %d\n", targetEL); |
| } |
| } |
| |
| return NoFault; |
| } |
| |
| Fault |
| ArmStaticInst::checkForWFxTrap64(ThreadContext *tc, |
| ExceptionLevel targetEL, |
| bool isWfe) const |
| { |
| // Check if target exception level is implemented. |
| assert(ArmSystem::haveEL(tc, targetEL)); |
| |
| // Check if processor needs to trap at selected exception level |
| bool trap = isWFxTrapping(tc, targetEL, isWfe); |
| |
| if (trap) { |
| uint32_t iss = isWfe? 0x1E00001 : /* WFE Instruction syndrome */ |
| 0x1E00000; /* WFI Instruction syndrome */ |
| switch (targetEL) { |
| case EL1: |
| return std::make_shared<SupervisorTrap>(machInst, iss, |
| EC_TRAPPED_WFI_WFE); |
| case EL2: |
| return std::make_shared<HypervisorTrap>(machInst, iss, |
| EC_TRAPPED_WFI_WFE); |
| case EL3: |
| return std::make_shared<SecureMonitorTrap>(machInst, iss, |
| EC_TRAPPED_WFI_WFE); |
| default: |
| panic("Unrecognized Exception Level: %d\n", targetEL); |
| } |
| } |
| |
| return NoFault; |
| } |
| |
| Fault |
| ArmStaticInst::trapWFx(ThreadContext *tc, |
| CPSR cpsr, SCR scr, |
| bool isWfe) const |
| { |
| Fault fault = NoFault; |
| if (cpsr.el == EL0) { |
| fault = checkForWFxTrap32(tc, EL1, isWfe); |
| } |
| |
| if ((fault == NoFault) && |
| ArmSystem::haveEL(tc, EL2) && !inSecureState(scr, cpsr) && |
| ((cpsr.el == EL0) || (cpsr.el == EL1))) { |
| |
| fault = checkForWFxTrap32(tc, EL2, isWfe); |
| } |
| |
| if ((fault == NoFault) && |
| ArmSystem::haveEL(tc, EL3) && cpsr.el != EL3) { |
| fault = checkForWFxTrap32(tc, EL3, isWfe); |
| } |
| |
| return fault; |
| } |
| |
| Fault |
| ArmStaticInst::checkSETENDEnabled(ThreadContext *tc, CPSR cpsr) const |
| { |
| bool setend_disabled(false); |
| ExceptionLevel pstateEL = (ExceptionLevel)(uint8_t)(cpsr.el); |
| |
| if (pstateEL == EL2) { |
| setend_disabled = ((SCTLR)tc->readMiscRegNoEffect(MISCREG_HSCTLR)).sed; |
| } else { |
| // Please note: in the armarm pseudocode there is a distinction |
| // whether EL1 is aarch32 or aarch64: |
| // if ELUsingAArch32(EL1) then SCTLR.SED else SCTLR[].SED; |
| // Considering that SETEND is aarch32 only, ELUsingAArch32(EL1) |
| // will always be true (hence using SCTLR.SED) except for |
| // instruction executed at EL0, and with an AArch64 EL1. |
| // In this case SCTLR_EL1 will be used. In gem5 the register is |
| // mapped to SCTLR_ns. We can safely use SCTLR and choose the |
| // appropriate bank version. |
| |
| // Get the index of the banked version of SCTLR: |
| // SCTLR_s or SCTLR_ns. |
| auto banked_sctlr = snsBankedIndex( |
| MISCREG_SCTLR, tc, !inSecureState(tc)); |
| |
| // SCTLR.SED bit is enabling/disabling the ue of SETEND instruction. |
| setend_disabled = ((SCTLR)tc->readMiscRegNoEffect(banked_sctlr)).sed; |
| } |
| |
| return setend_disabled ? undefinedFault32(tc, pstateEL) : |
| NoFault; |
| } |
| |
| Fault |
| ArmStaticInst::undefinedFault32(ThreadContext *tc, |
| ExceptionLevel pstateEL) const |
| { |
| // Even if we are running in aarch32, the fault might be dealt with in |
| // aarch64 ISA. |
| if (generalExceptionsToAArch64(tc, pstateEL)) { |
| return undefinedFault64(tc, pstateEL); |
| } else { |
| // Please note: according to the ARM ARM pseudocode we should handle |
| // the case when EL2 is aarch64 and HCR.TGE is 1 as well. |
| // However this case is already handled by the routeToHyp method in |
| // ArmFault class. |
| return std::make_shared<UndefinedInstruction>( |
| machInst, 0, |
| EC_UNKNOWN, mnemonic); |
| } |
| } |
| |
| Fault |
| ArmStaticInst::undefinedFault64(ThreadContext *tc, |
| ExceptionLevel pstateEL) const |
| { |
| switch (pstateEL) { |
| case EL0: |
| case EL1: |
| return std::make_shared<SupervisorTrap>(machInst, 0, EC_UNKNOWN); |
| case EL2: |
| return std::make_shared<HypervisorTrap>(machInst, 0, EC_UNKNOWN); |
| case EL3: |
| return std::make_shared<SecureMonitorTrap>(machInst, 0, EC_UNKNOWN); |
| default: |
| panic("Unrecognized Exception Level: %d\n", pstateEL); |
| break; |
| } |
| |
| return NoFault; |
| } |
| |
| static uint8_t |
| getRestoredITBits(ThreadContext *tc, CPSR spsr) |
| { |
| // See: shared/functions/system/RestoredITBits in the ARM ARM |
| |
| const ExceptionLevel el = opModeToEL((OperatingMode) (uint8_t)spsr.mode); |
| const uint8_t it = itState(spsr); |
| |
| if (!spsr.t || spsr.il) |
| return 0; |
| |
| // The IT bits are forced to zero when they are set to a reserved |
| // value. |
| if (bits(it, 7, 4) != 0 && bits(it, 3, 0) == 0) |
| return 0; |
| |
| const bool itd = el == EL2 ? |
| ((SCTLR)tc->readMiscReg(MISCREG_HSCTLR)).itd : |
| ((SCTLR)tc->readMiscReg(MISCREG_SCTLR)).itd; |
| |
| // The IT bits are forced to zero when returning to A32 state, or |
| // when returning to an EL with the ITD bit set to 1, and the IT |
| // bits are describing a multi-instruction block. |
| if (itd && bits(it, 2, 0) != 0) |
| return 0; |
| |
| return it; |
| } |
| |
| static bool |
| illegalExceptionReturn(ThreadContext *tc, CPSR cpsr, CPSR spsr) |
| { |
| const OperatingMode mode = (OperatingMode) (uint8_t)spsr.mode; |
| if (badMode(mode)) |
| return true; |
| |
| const OperatingMode cur_mode = (OperatingMode) (uint8_t)cpsr.mode; |
| const ExceptionLevel target_el = opModeToEL(mode); |
| |
| HCR hcr = ((HCR)tc->readMiscReg(MISCREG_HCR_EL2)); |
| SCR scr = ((SCR)tc->readMiscReg(MISCREG_SCR_EL3)); |
| |
| if (target_el > opModeToEL(cur_mode)) |
| return true; |
| |
| if (!ArmSystem::haveEL(tc, target_el)) |
| return true; |
| |
| if (target_el == EL1 && ArmSystem::haveEL(tc, EL2) && scr.ns && hcr.tge) |
| return true; |
| |
| if (target_el == EL2 && ArmSystem::haveEL(tc, EL3) && !scr.ns) |
| return true; |
| |
| bool spsr_mode_is_aarch32 = (spsr.width == 1); |
| bool known, target_el_is_aarch32; |
| std::tie(known, target_el_is_aarch32) = ELUsingAArch32K(tc, target_el); |
| assert(known || (target_el == EL0 && ELIs64(tc, EL1))); |
| |
| if (known && (spsr_mode_is_aarch32 != target_el_is_aarch32)) |
| return true; |
| |
| if (!spsr.width) { |
| // aarch64 |
| if (!ArmSystem::highestELIs64(tc)) |
| return true; |
| if (spsr & 0x2) |
| return true; |
| if (target_el == EL0 && spsr.sp) |
| return true; |
| } else { |
| // aarch32 |
| return badMode32(mode); |
| } |
| |
| return false; |
| } |
| |
| CPSR |
| ArmStaticInst::getPSTATEFromPSR(ThreadContext *tc, CPSR cpsr, CPSR spsr) const |
| { |
| CPSR new_cpsr = 0; |
| |
| // gem5 doesn't implement single-stepping, so force the SS bit to |
| // 0. |
| new_cpsr.ss = 0; |
| |
| if (illegalExceptionReturn(tc, cpsr, spsr)) { |
| // If the SPSR specifies an illegal exception return, |
| // then PSTATE.{M, nRW, EL, SP} are unchanged and PSTATE.IL |
| // is set to 1. |
| new_cpsr.il = 1; |
| if (cpsr.width) { |
| new_cpsr.mode = cpsr.mode; |
| } else { |
| new_cpsr.width = cpsr.width; |
| new_cpsr.el = cpsr.el; |
| new_cpsr.sp = cpsr.sp; |
| } |
| } else { |
| new_cpsr.il = spsr.il; |
| if (spsr.width && badMode32((OperatingMode)(uint8_t)spsr.mode)) { |
| new_cpsr.il = 1; |
| } else if (spsr.width) { |
| new_cpsr.mode = spsr.mode; |
| } else { |
| new_cpsr.el = spsr.el; |
| new_cpsr.sp = spsr.sp; |
| } |
| } |
| |
| new_cpsr.nz = spsr.nz; |
| new_cpsr.c = spsr.c; |
| new_cpsr.v = spsr.v; |
| if (new_cpsr.width) { |
| // aarch32 |
| const ITSTATE it = getRestoredITBits(tc, spsr); |
| new_cpsr.q = spsr.q; |
| new_cpsr.ge = spsr.ge; |
| new_cpsr.e = spsr.e; |
| new_cpsr.aif = spsr.aif; |
| new_cpsr.t = spsr.t; |
| new_cpsr.it2 = it.top6; |
| new_cpsr.it1 = it.bottom2; |
| } else { |
| // aarch64 |
| new_cpsr.daif = spsr.daif; |
| } |
| |
| return new_cpsr; |
| } |
| |
| bool |
| ArmStaticInst::generalExceptionsToAArch64(ThreadContext *tc, |
| ExceptionLevel pstateEL) const |
| { |
| // Returns TRUE if exceptions normally routed to EL1 are being handled |
| // at an Exception level using AArch64, because either EL1 is using |
| // AArch64 or TGE is in force and EL2 is using AArch64. |
| HCR hcr = ((HCR)tc->readMiscReg(MISCREG_HCR_EL2)); |
| return (pstateEL == EL0 && !ELIs32(tc, EL1)) || |
| (ArmSystem::haveEL(tc, EL2) && !inSecureState(tc) && |
| !ELIs32(tc, EL2) && hcr.tge); |
| } |
| |
| |
| } |
