| // -*- mode:c++ -*- |
| |
| // Copyright (c) 2011-2013, 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: Gabe Black |
| // Giacomo Gabrielli |
| |
| let {{ |
| |
| header_output = "" |
| decoder_output = "" |
| exec_output = "" |
| |
| # B, BL |
| for (mnem, link) in (("b", False), ("bl", True)): |
| bCode = ('NPC = purifyTaggedAddr(RawPC + imm, xc->tcBase(), ' |
| 'currEL(xc->tcBase()));\n') |
| instFlags = ['IsDirectControl', 'IsUncondControl'] |
| if (link): |
| bCode += 'XLR = RawPC + 4;\n' |
| instFlags += ['IsCall'] |
| |
| bIop = InstObjParams(mnem, mnem.capitalize() + "64", |
| "BranchImm64", bCode, instFlags) |
| header_output += BranchImm64Declare.subst(bIop) |
| decoder_output += BranchImm64Constructor.subst(bIop) |
| exec_output += BasicExecute.subst(bIop) |
| |
| # BR, BLR |
| for (mnem, link) in (("br", False), ("blr", True)): |
| bCode = ('NPC = purifyTaggedAddr(XOp1, xc->tcBase(), ' |
| 'currEL(xc->tcBase()));\n') |
| instFlags = ['IsIndirectControl', 'IsUncondControl'] |
| if (link): |
| bCode += 'XLR = RawPC + 4;\n' |
| instFlags += ['IsCall'] |
| |
| bIop = InstObjParams(mnem, mnem.capitalize() + "64", |
| "BranchReg64", bCode, instFlags) |
| header_output += BranchReg64Declare.subst(bIop) |
| decoder_output += BranchReg64Constructor.subst(bIop) |
| exec_output += BasicExecute.subst(bIop) |
| |
| # B conditional |
| bCode = ''' |
| if (testPredicate(CondCodesNZ, CondCodesC, CondCodesV, condCode)) |
| NPC = purifyTaggedAddr(RawPC + imm, xc->tcBase(), |
| currEL(xc->tcBase())); |
| else |
| NPC = NPC; |
| ''' |
| bIop = InstObjParams("b", "BCond64", "BranchImmCond64", bCode, |
| ['IsCondControl', 'IsDirectControl']) |
| header_output += BranchImmCond64Declare.subst(bIop) |
| decoder_output += BranchImmCond64Constructor.subst(bIop) |
| exec_output += BasicExecute.subst(bIop) |
| |
| # RET |
| bCode = ('NPC = purifyTaggedAddr(XOp1, xc->tcBase(), ' |
| 'currEL(xc->tcBase()));\n') |
| instFlags = ['IsIndirectControl', 'IsUncondControl', 'IsReturn'] |
| |
| bIop = InstObjParams('ret', 'Ret64', "BranchRet64", bCode, instFlags) |
| header_output += BranchReg64Declare.subst(bIop) |
| decoder_output += BranchReg64Constructor.subst(bIop) |
| exec_output += BasicExecute.subst(bIop) |
| |
| # ERET |
| bCode = '''Addr newPc; |
| CPSR cpsr = Cpsr; |
| CPSR spsr = Spsr; |
| |
| ExceptionLevel curr_el = opModeToEL((OperatingMode) (uint8_t) cpsr.mode); |
| switch (curr_el) { |
| case EL3: |
| newPc = xc->tcBase()->readMiscReg(MISCREG_ELR_EL3); |
| break; |
| case EL2: |
| newPc = xc->tcBase()->readMiscReg(MISCREG_ELR_EL2); |
| break; |
| case EL1: |
| newPc = xc->tcBase()->readMiscReg(MISCREG_ELR_EL1); |
| break; |
| default: |
| return std::make_shared<UndefinedInstruction>(machInst, |
| false, |
| mnemonic); |
| break; |
| } |
| if (spsr.width) { |
| // Exception return to AArch32. |
| // 32 most significant bits are ignored |
| newPc &= mask(32); |
| |
| if (newPc & mask(2)) { |
| // Mask bits to avoid PC Alignment fault when returning |
| // to AArch32 |
| if (spsr.t) |
| newPc = newPc & ~mask(1); |
| else |
| newPc = newPc & ~mask(2); |
| } |
| } |
| |
| CPSR new_cpsr = getPSTATEFromPSR(xc->tcBase(), cpsr, spsr); |
| |
| Cpsr = new_cpsr; |
| CondCodesNZ = new_cpsr.nz; |
| CondCodesC = new_cpsr.c; |
| CondCodesV = new_cpsr.v; |
| |
| NextAArch64 = !new_cpsr.width; |
| NextItState = itState(new_cpsr); |
| NPC = purifyTaggedAddr(newPc, xc->tcBase(), |
| opModeToEL((OperatingMode) (uint8_t) new_cpsr.mode)); |
| |
| LLSCLock = 0; // Clear exclusive monitor |
| SevMailbox = 1; //Set Event Register |
| ''' |
| instFlags = ['IsSerializeAfter', 'IsNonSpeculative', 'IsSquashAfter'] |
| bIop = InstObjParams('eret', 'Eret64', "BranchEret64", bCode, instFlags) |
| header_output += BasicDeclare.subst(bIop) |
| decoder_output += BasicConstructor64.subst(bIop) |
| exec_output += BasicExecute.subst(bIop) |
| |
| # CBNZ, CBZ |
| for (mnem, test) in (("cbz", "=="), ("cbnz", "!=")): |
| code = ('NPC = (Op164 %(test)s 0) ? ' |
| 'purifyTaggedAddr(RawPC + imm, xc->tcBase(), ' |
| 'currEL(xc->tcBase())) : NPC;\n') |
| code = code % {"test": test} |
| iop = InstObjParams(mnem, mnem.capitalize() + "64", |
| "BranchImmReg64", code, |
| ['IsCondControl', 'IsDirectControl']) |
| header_output += BranchImmReg64Declare.subst(iop) |
| decoder_output += BranchImmReg64Constructor.subst(iop) |
| exec_output += BasicExecute.subst(iop) |
| |
| # TBNZ, TBZ |
| for (mnem, test) in (("tbz", "=="), ("tbnz", "!=")): |
| code = ('NPC = ((Op164 & imm1) %(test)s 0) ? ' |
| 'purifyTaggedAddr(RawPC + imm2, xc->tcBase(), ' |
| 'currEL(xc->tcBase())) : NPC;\n') |
| code = code % {"test": test} |
| iop = InstObjParams(mnem, mnem.capitalize() + "64", |
| "BranchImmImmReg64", code, |
| ['IsCondControl', 'IsDirectControl']) |
| header_output += BranchImmImmReg64Declare.subst(iop) |
| decoder_output += BranchImmImmReg64Constructor.subst(iop) |
| exec_output += BasicExecute.subst(iop) |
| }}; |
