| // -*- mode:c++ -*- |
| |
| // Copyright (c) 2010-2012, 2014 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 |
| |
| let {{ |
| |
| header_output = "" |
| decoder_output = "" |
| exec_output = "" |
| |
| # B, BL |
| for (mnem, link) in (("b", False), ("bl", True)): |
| bCode = ''' |
| NPC = (uint32_t)(PC + imm); |
| ''' |
| br_tgt_code = '''pcs.instNPC((uint32_t)(branchPC.instPC() + imm));''' |
| instFlags = ["IsDirectControl"] |
| if (link): |
| bCode += ''' |
| if (Thumb) |
| LR = PC | 1; |
| else |
| LR = PC - 4; |
| ''' |
| instFlags += ["IsCall"] |
| |
| |
| bIop = InstObjParams(mnem, mnem.capitalize(), "BranchImmCond", |
| {"code": bCode, "predicate_test": predicateTest, |
| "brTgtCode" : br_tgt_code}, instFlags) |
| header_output += BranchImmCondDeclare.subst(bIop) |
| decoder_output += BranchImmCondConstructor.subst(bIop) + \ |
| BranchTarget.subst(bIop) |
| exec_output += PredOpExecute.subst(bIop) |
| |
| # BX, BLX |
| blxCode = ''' |
| %(link)s |
| // Switch modes |
| %(branch)s |
| ''' |
| |
| blxList = (("blx", True, True), |
| ("blx", False, True), |
| ("bx", False, False)) |
| |
| for (mnem, imm, link) in blxList: |
| Name = mnem.capitalize() |
| isRasPop = 0 |
| if imm: |
| Name += "Imm" |
| # Since we're switching ISAs, the target ISA will be the opposite |
| # of the current ISA. Thumb is whether the target is ARM. |
| newPC = '(uint32_t)(Thumb ? (roundDown(PC, 4) + imm) : (PC + imm))' |
| br_tgt_code = ''' |
| pcs.instNPC((uint32_t)(branchPC.thumb() ? (roundDown(branchPC.instPC(),4) + imm) : |
| (branchPC.instPC() + imm))); |
| ''' |
| base = "BranchImmCond" |
| declare = BranchImmCondDeclare |
| constructor = BranchImmCondConstructor |
| instFlags = ["IsDirectControl"] |
| else: |
| Name += "Reg" |
| newPC = 'Op1' |
| br_tgt_code = '' |
| base = "BranchRegCond" |
| declare = BranchRegCondDeclare |
| constructor = BranchRegCondConstructor |
| instFlags = ["IsIndirectControl"] |
| if link and imm: |
| linkStr = ''' |
| // The immediate version of the blx thumb instruction |
| // is 32 bits wide, but "next pc" doesn't reflect that |
| // so we don't want to substract 2 from it at this point |
| if (Thumb) |
| LR = PC | 1; |
| else |
| LR = PC - 4; |
| ''' |
| instFlags += ["IsCall"] |
| elif link: |
| linkStr = ''' |
| if (Thumb) |
| LR = (PC - 2) | 1; |
| else |
| LR = PC - 4; |
| ''' |
| instFlags += ["IsCall"] |
| else: |
| linkStr = "" |
| isRasPop = "op1 == INTREG_LR" |
| |
| if imm and link: #blx with imm |
| branchStr = ''' |
| NextThumb = !Thumb; |
| NPC = %(newPC)s; |
| ''' |
| br_tgt_code = '''pcs.nextThumb(!branchPC.thumb());\n''' + \ |
| br_tgt_code |
| else: |
| branchStr = "IWNPC = %(newPC)s;" |
| branchStr = branchStr % { "newPC" : newPC } |
| |
| code = blxCode % {"link": linkStr, |
| "newPC": newPC, |
| "branch": branchStr} |
| blxIop = InstObjParams(mnem, Name, base, |
| {"code": code, "brTgtCode" : br_tgt_code, |
| "predicate_test": predicateTest, |
| "is_ras_pop" : isRasPop }, instFlags) |
| header_output += declare.subst(blxIop) |
| decoder_output += constructor.subst(blxIop) |
| exec_output += PredOpExecute.subst(blxIop) |
| if imm: |
| decoder_output += BranchTarget.subst(blxIop) |
| |
| bxjcode = ''' |
| HSTR hstr = Hstr; |
| CPSR cpsr = Cpsr; |
| SCR scr = Scr; |
| |
| if (ArmSystem::haveVirtualization(xc->tcBase()) && hstr.tjdbx && |
| !inSecureState(scr, cpsr) && (cpsr.mode != MODE_HYP)) { |
| fault = std::make_shared<HypervisorTrap>(machInst, op1, EC_TRAPPED_BXJ); |
| } |
| IWNPC = Op1; |
| ''' |
| |
| bxjIop = InstObjParams("bxj", "BxjReg", "BranchRegCond", |
| {"code": bxjcode, |
| "predicate_test": predicateTest, |
| "is_ras_pop": "op1 == INTREG_LR" }, |
| ["IsIndirectControl"]) |
| header_output += BranchRegCondDeclare.subst(bxjIop) |
| decoder_output += BranchRegCondConstructor.subst(bxjIop) |
| exec_output += PredOpExecute.subst(bxjIop) |
| |
| #CBNZ, CBZ. These are always unconditional as far as predicates |
| for (mnem, test) in (("cbz", "=="), ("cbnz", "!=")): |
| code = 'NPC = (uint32_t)(PC + imm);\n' |
| br_tgt_code = '''pcs.instNPC((uint32_t)(branchPC.instPC() + imm));''' |
| predTest = "Op1 %(test)s 0" % {"test": test} |
| iop = InstObjParams(mnem, mnem.capitalize(), "BranchImmReg", |
| {"code": code, "predicate_test": predTest, |
| "brTgtCode" : br_tgt_code}, |
| ["IsDirectControl"]) |
| header_output += BranchImmRegDeclare.subst(iop) |
| decoder_output += BranchImmRegConstructor.subst(iop) + \ |
| BranchTarget.subst(iop) |
| exec_output += PredOpExecute.subst(iop) |
| |
| #TBB, TBH |
| for isTbh in (0, 1): |
| if isTbh: |
| eaCode = ''' |
| unsigned memAccessFlags = ArmISA::TLB::AllowUnaligned | |
| ArmISA::TLB::AlignHalfWord | |
| ArmISA::TLB::MustBeOne; |
| EA = Op1 + Op2 * 2 |
| ''' |
| accCode = 'NPC = PC + 2 * (Mem_uh);\n' |
| mnem = "tbh" |
| else: |
| eaCode = ''' |
| unsigned memAccessFlags = ArmISA::TLB::AllowUnaligned | |
| ArmISA::TLB::AlignByte | |
| ArmISA::TLB::MustBeOne; |
| EA = Op1 + Op2 |
| ''' |
| accCode = 'NPC = PC + 2 * (Mem_ub)' |
| mnem = "tbb" |
| iop = InstObjParams(mnem, mnem.capitalize(), "BranchRegReg", |
| {'ea_code': eaCode, |
| 'memacc_code': accCode, |
| 'predicate_test': predicateTest}, |
| ["IsIndirectControl"]) |
| header_output += BranchTableDeclare.subst(iop) |
| decoder_output += BranchRegRegConstructor.subst(iop) |
| exec_output += LoadExecute.subst(iop) + \ |
| LoadInitiateAcc.subst(iop) + \ |
| LoadCompleteAcc.subst(iop) |
| }}; |
