//===-- ARMDisassembler.cpp - Disassembler for ARM/Thumb ISA --------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// /* Capstone Disassembly Engine */ /* By Nguyen Anh Quynh , 2013-2014 */ #ifdef CAPSTONE_HAS_ARM #include #include #include #include #include "ARMAddressingModes.h" #include "ARMBaseInfo.h" #include "../../MCFixedLenDisassembler.h" #include "../../MCInst.h" #include "../../MCInstrDesc.h" #include "../../MCRegisterInfo.h" #include "../../LEB128.h" #include "../../MCDisassembler.h" #include "../../cs_priv.h" #include "../../utils.h" #include "ARMDisassembler.h" //#define GET_REGINFO_ENUM //#include "X86GenRegisterInfo.inc" #define GET_SUBTARGETINFO_ENUM #include "ARMGenSubtargetInfo.inc" #define GET_INSTRINFO_MC_DESC #include "ARMGenInstrInfo.inc" #define GET_INSTRINFO_ENUM #include "ARMGenInstrInfo.inc" static bool ITStatus_push_back(ARM_ITStatus *it, char v) { it->ITStates[it->size] = v; it->size++; return true; } // Returns true if the current instruction is in an IT block static bool ITStatus_instrInITBlock(ARM_ITStatus *it) { //return !ITStates.empty(); return (it->size > 0); } // Returns true if current instruction is the last instruction in an IT block static bool ITStatus_instrLastInITBlock(ARM_ITStatus *it) { return (it->size == 1); } // Handles the condition code status of instructions in IT blocks // Returns the condition code for instruction in IT block static unsigned ITStatus_getITCC(ARM_ITStatus *it) { unsigned CC = ARMCC_AL; if (ITStatus_instrInITBlock(it)) //CC = ITStates.back(); CC = it->ITStates[it->size-1]; return CC; } // Advances the IT block state to the next T or E static void ITStatus_advanceITState(ARM_ITStatus *it) { //ITStates.pop_back(); it->size--; } // Called when decoding an IT instruction. Sets the IT state for the following // instructions that for the IT block. Firstcond and Mask correspond to the // fields in the IT instruction encoding. static void ITStatus_setITState(ARM_ITStatus *it, char Firstcond, char Mask) { // (3 - the number of trailing zeros) is the number of then / else. unsigned CondBit0 = Firstcond & 1; unsigned NumTZ = CountTrailingZeros_32(Mask); unsigned char CCBits = (unsigned char)Firstcond & 0xf; unsigned Pos; //assert(NumTZ <= 3 && "Invalid IT mask!"); // push condition codes onto the stack the correct order for the pops for (Pos = NumTZ+1; Pos <= 3; ++Pos) { bool T = ((Mask >> Pos) & 1) == (int)CondBit0; if (T) ITStatus_push_back(it, CCBits); else ITStatus_push_back(it, CCBits ^ 1); } ITStatus_push_back(it, CCBits); } /// ThumbDisassembler - Thumb disassembler for all Thumb platforms. static bool Check(DecodeStatus *Out, DecodeStatus In) { switch (In) { case MCDisassembler_Success: // Out stays the same. return true; case MCDisassembler_SoftFail: *Out = In; return true; case MCDisassembler_Fail: *Out = In; return false; default: // never reached return false; } } // Forward declare these because the autogenerated code will reference them. // Definitions are further down. static DecodeStatus DecodeGPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodeGPRnopcRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodeGPRwithAPSRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodetGPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodetcGPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecoderGPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodeGPRPairRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodeSPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodeDPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodeDPR_8RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodeDPR_VFP2RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodeQPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodeDPairRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodeDPairSpacedRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder); static DecodeStatus DecodePredicateOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeCCOutOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeSOImmOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeRegListOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeSPRRegListOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeDPRRegListOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeBitfieldMaskOperand(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeCopMemInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeAddrMode2IdxInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeSORegMemOperand(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeAddrMode3Instruction(MCInst *Inst,unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeSORegImmOperand(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeSORegRegOperand(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeMemMultipleWritebackInstruction(MCInst * Inst, unsigned Insn, uint64_t Adddress, const void *Decoder); static DecodeStatus DecodeT2MOVTWInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeArmMOVTWInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeSMLAInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeCPSInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2CPSInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeAddrModeImm12Operand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeAddrMode5Operand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeAddrMode7Operand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2BInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeBranchImmInstruction(MCInst *Inst,unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeAddrMode6Operand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLDST1Instruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLDST2Instruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLDST3Instruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLDST4Instruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLDInstruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVSTInstruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLD1DupInstruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLD2DupInstruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLD3DupInstruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLD4DupInstruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeNEONModImmInstruction(MCInst *Inst,unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVSHLMaxInstruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeShiftRight8Imm(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeShiftRight16Imm(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeShiftRight32Imm(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeShiftRight64Imm(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeTBLInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodePostIdxReg(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeCoprocessor(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeMemBarrierOption(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeInstSyncBarrierOption(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeMSRMask(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeDoubleRegLoad(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeDoubleRegStore(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeLDRPreImm(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeLDRPreReg(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeSTRPreImm(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeSTRPreReg(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLD1LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLD2LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLD3LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVLD4LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVST1LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVST2LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVST3LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVST4LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVMOVSRR(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVMOVRRS(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeSwap(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVCVTD(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeVCVTQ(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbAddSpecialReg(MCInst *Inst, uint16_t Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbBROperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2BROperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbCmpBROperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbAddrModeRR(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbAddrModeIS(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbAddrModePC(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbAddrModeSP(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2AddrModeSOReg(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2LoadShift(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2LoadImm8(MCInst *Inst, unsigned Insn, uint64_t Address, const void* Decoder); static DecodeStatus DecodeT2LoadImm12(MCInst *Inst, unsigned Insn, uint64_t Address, const void* Decoder); static DecodeStatus DecodeT2LoadT(MCInst *Inst, unsigned Insn, uint64_t Address, const void* Decoder); static DecodeStatus DecodeT2LoadLabel(MCInst *Inst, unsigned Insn, uint64_t Address, const void* Decoder); static DecodeStatus DecodeT2Imm8S4(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2AddrModeImm8s4(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst *Inst,unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2Imm8(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2AddrModeImm8(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbAddSPImm(MCInst *Inst, uint16_t Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbAddSPReg(MCInst *Inst, uint16_t Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbCPS(MCInst *Inst, uint16_t Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeQADDInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbBLXOffset(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2AddrModeImm12(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbTableBranch(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumb2BCCInstruction(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2SOImm(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbBCCTargetOperand(MCInst *Inst,unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeThumbBLTargetOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeIT(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2LDRDPreInstruction(MCInst *Inst,unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2STRDPreInstruction(MCInst *Inst,unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2Adr(MCInst *Inst, uint32_t Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2LdStPre(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeT2ShifterImmOperand(MCInst *Inst, uint32_t Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeLDR(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); static DecodeStatus DecodeMRRC2(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder); // Hacky: enable all features for disassembler static uint64_t getFeatureBits(int mode) { uint64_t Bits = (uint64_t)-1; // everything by default // FIXME: ARM_FeatureVFPOnlySP is conflicting with everything else?? Bits &= (~ARM_FeatureVFPOnlySP); // FIXME: no Armv8 support? //Bits -= ARM_HasV7Ops; //Bits &= ~ARM_FeatureMP; //Bits &= ~ARM_HasV8Ops; //Bits &= ~ARM_HasV6Ops; //Bits &= (~ARM_FeatureMClass); // some features are mutually exclusive if (mode & CS_MODE_THUMB) { //Bits &= ~ARM_HasV6Ops; //Bits &= ~ARM_FeatureCRC; //Bits &= ~ARM_HasV5TEOps; //Bits &= ~ARM_HasV4TOps; //Bits &= ~ARM_HasV6T2Ops; //Bits &= ~ARM_FeatureDB; //Bits &= ~ARM_FeatureHWDivARM; //Bits &= ~ARM_FeatureNaClTrap; //Bits &= ~ARM_FeatureMClass; // ArmV8 } else { // ARM mode Bits &= ~ARM_ModeThumb; Bits &= ~ARM_FeatureThumb2; } return Bits; } #include "ARMGenDisassemblerTables.inc" static DecodeStatus DecodePredicateOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { if (Val == 0xF) return MCDisassembler_Fail; // AL predicate is not allowed on Thumb1 branches. if (MCInst_getOpcode(Inst) == ARM_tBcc && Val == 0xE) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, Val); if (Val == ARMCC_AL) { MCOperand_CreateReg0(Inst, 0); } else MCOperand_CreateReg0(Inst, ARM_CPSR); return MCDisassembler_Success; } #define GET_REGINFO_MC_DESC #include "ARMGenRegisterInfo.inc" void ARM_init(MCRegisterInfo *MRI) { /* InitMCRegisterInfo(ARMRegDesc, 289, RA, PC, ARMMCRegisterClasses, 100, ARMRegUnitRoots, 77, ARMRegDiffLists, ARMRegStrings, ARMSubRegIdxLists, 57, ARMSubRegIdxRanges, ARMRegEncodingTable); */ MCRegisterInfo_InitMCRegisterInfo(MRI, ARMRegDesc, 289, 0, 0, ARMMCRegisterClasses, 100, 0, 0, ARMRegDiffLists, 0, ARMSubRegIdxLists, 57, 0); } static DecodeStatus _ARM_getInstruction(cs_struct *ud, MCInst *MI, const uint8_t *code, size_t code_len, uint16_t *Size, uint64_t Address) { uint32_t insn; uint8_t bytes[4]; DecodeStatus result; if (code_len < 4) // not enough data return MCDisassembler_Fail; ud->ITBlock.size = 0; if (MI->flat_insn->detail) { memset(&MI->flat_insn->detail->arm, 0, sizeof(cs_arm)); } memcpy(bytes, code, 4); if (ud->big_endian) insn = (bytes[3] << 0) | (bytes[2] << 8) | (bytes[1] << 16) | (bytes[0] << 24); else insn = (bytes[3] << 24) | (bytes[2] << 16) | (bytes[1] << 8) | (bytes[0] << 0); // Calling the auto-generated decoder function. result = decodeInstruction_4(DecoderTableARM32, MI, insn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; return result; } // VFP and NEON instructions, similarly, are shared between ARM // and Thumb modes. MCInst_clear(MI); result = decodeInstruction_4(DecoderTableVFP32, MI, insn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; return result; } MCInst_clear(MI); result = decodeInstruction_4(DecoderTableVFPV832, MI, insn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; return result; } MCInst_clear(MI); result = decodeInstruction_4(DecoderTableNEONData32, MI, insn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; // Add a fake predicate operand, because we share these instruction // definitions with Thumb2 where these instructions are predicable. if (!DecodePredicateOperand(MI, 0xE, Address, NULL)) return MCDisassembler_Fail; return result; } MCInst_clear(MI); result = decodeInstruction_4(DecoderTableNEONLoadStore32, MI, insn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; // Add a fake predicate operand, because we share these instruction // definitions with Thumb2 where these instructions are predicable. if (!DecodePredicateOperand(MI, 0xE, Address, NULL)) return MCDisassembler_Fail; return result; } MCInst_clear(MI); result = decodeInstruction_4(DecoderTableNEONDup32, MI, insn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; // Add a fake predicate operand, because we share these instruction // definitions with Thumb2 where these instructions are predicable. if (!DecodePredicateOperand(MI, 0xE, Address, NULL)) return MCDisassembler_Fail; return result; } MCInst_clear(MI); result = decodeInstruction_4(DecoderTablev8NEON32, MI, insn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; return result; } MCInst_clear(MI); result = decodeInstruction_4(DecoderTablev8Crypto32, MI, insn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; return result; } MCInst_clear(MI); *Size = 0; return MCDisassembler_Fail; } // Thumb1 instructions don't have explicit S bits. Rather, they // implicitly set CPSR. Since it's not represented in the encoding, the // auto-generated decoder won't inject the CPSR operand. We need to fix // that as a post-pass. static void AddThumb1SBit(MCInst *MI, bool InITBlock) { MCOperandInfo *OpInfo = ARMInsts[MCInst_getOpcode(MI)].OpInfo; unsigned short NumOps = ARMInsts[MCInst_getOpcode(MI)].NumOperands; unsigned i; for (i = 0; i < NumOps; ++i) { if (i == MCInst_getNumOperands(MI)) break; if (MCOperandInfo_isOptionalDef(&OpInfo[i]) && OpInfo[i].RegClass == ARM_CCRRegClassID) { if (i > 0 && MCOperandInfo_isPredicate(&OpInfo[i-1])) continue; MCInst_insert0(MI, i, MCOperand_CreateReg1(MI, InITBlock ? 0 : ARM_CPSR)); return; } } //MI.insert(I, MCOperand_CreateReg0(Inst, InITBlock ? 0 : ARM_CPSR)); MCInst_insert0(MI, i, MCOperand_CreateReg1(MI, InITBlock ? 0 : ARM_CPSR)); } // Most Thumb instructions don't have explicit predicates in the // encoding, but rather get their predicates from IT context. We need // to fix up the predicate operands using this context information as a // post-pass. static DecodeStatus AddThumbPredicate(cs_struct *ud, MCInst *MI) { DecodeStatus S = MCDisassembler_Success; MCOperandInfo *OpInfo; unsigned short NumOps; unsigned int i; unsigned CC; // A few instructions actually have predicates encoded in them. Don't // try to overwrite it if we're seeing one of those. switch (MCInst_getOpcode(MI)) { case ARM_tBcc: case ARM_t2Bcc: case ARM_tCBZ: case ARM_tCBNZ: case ARM_tCPS: case ARM_t2CPS3p: case ARM_t2CPS2p: case ARM_t2CPS1p: case ARM_tMOVSr: case ARM_tSETEND: // Some instructions (mostly conditional branches) are not // allowed in IT blocks. if (ITStatus_instrInITBlock(&(ud->ITBlock))) S = MCDisassembler_SoftFail; else return MCDisassembler_Success; break; case ARM_tB: case ARM_t2B: case ARM_t2TBB: case ARM_t2TBH: // Some instructions (mostly unconditional branches) can // only appears at the end of, or outside of, an IT. //if (ITBlock.instrInITBlock() && !ITBlock.instrLastInITBlock()) if (ITStatus_instrInITBlock(&(ud->ITBlock)) && !ITStatus_instrLastInITBlock(&(ud->ITBlock))) S = MCDisassembler_SoftFail; break; default: break; } // If we're in an IT block, base the predicate on that. Otherwise, // assume a predicate of AL. CC = ITStatus_getITCC(&(ud->ITBlock)); if (CC == 0xF) CC = ARMCC_AL; if (ITStatus_instrInITBlock(&(ud->ITBlock))) ITStatus_advanceITState(&(ud->ITBlock)); OpInfo = ARMInsts[MCInst_getOpcode(MI)].OpInfo; NumOps = ARMInsts[MCInst_getOpcode(MI)].NumOperands; for (i = 0; i < NumOps; ++i) { if (i == MCInst_getNumOperands(MI)) break; if (MCOperandInfo_isPredicate(&OpInfo[i])) { MCInst_insert0(MI, i, MCOperand_CreateImm1(MI, CC)); if (CC == ARMCC_AL) MCInst_insert0(MI, i+1, MCOperand_CreateReg1(MI, 0)); else MCInst_insert0(MI, i+1, MCOperand_CreateReg1(MI, ARM_CPSR)); return S; } } MCInst_insert0(MI, i, MCOperand_CreateImm1(MI, CC)); if (CC == ARMCC_AL) MCInst_insert0(MI, i+1, MCOperand_CreateReg1(MI, 0)); else MCInst_insert0(MI, i+1, MCOperand_CreateReg1(MI, ARM_CPSR)); return S; } // Thumb VFP instructions are a special case. Because we share their // encodings between ARM and Thumb modes, and they are predicable in ARM // mode, the auto-generated decoder will give them an (incorrect) // predicate operand. We need to rewrite these operands based on the IT // context as a post-pass. static void UpdateThumbVFPPredicate(cs_struct *ud, MCInst *MI) { unsigned CC; unsigned short NumOps; MCOperandInfo *OpInfo; unsigned i; CC = ITStatus_getITCC(&(ud->ITBlock)); if (ITStatus_instrInITBlock(&(ud->ITBlock))) ITStatus_advanceITState(&(ud->ITBlock)); OpInfo = ARMInsts[MCInst_getOpcode(MI)].OpInfo; NumOps = ARMInsts[MCInst_getOpcode(MI)].NumOperands; for (i = 0; i < NumOps; ++i) { if (MCOperandInfo_isPredicate(&OpInfo[i])) { MCOperand_setImm(MCInst_getOperand(MI, i), CC); if (CC == ARMCC_AL) MCOperand_setReg(MCInst_getOperand(MI, i+1), 0); else MCOperand_setReg(MCInst_getOperand(MI, i+1), ARM_CPSR); return; } } } static DecodeStatus _Thumb_getInstruction(cs_struct *ud, MCInst *MI, const uint8_t *code, size_t code_len, uint16_t *Size, uint64_t Address) { uint8_t bytes[4]; uint16_t insn16; DecodeStatus result; bool InITBlock; unsigned Firstcond, Mask; uint32_t NEONLdStInsn, insn32, NEONDataInsn, NEONCryptoInsn, NEONv8Insn; // We want to read exactly 2 bytes of data. if (code_len < 2) // not enough data return MCDisassembler_Fail; ud->ITBlock.size = 0; if (MI->flat_insn->detail) { memset(&MI->flat_insn->detail->arm, 0, sizeof(cs_arm)); } memcpy(bytes, code, 2); if (ud->big_endian) insn16 = (bytes[0] << 8) | bytes[1]; else insn16 = (bytes[1] << 8) | bytes[0]; result = decodeInstruction_2(DecoderTableThumb16, MI, insn16, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 2; Check(&result, AddThumbPredicate(ud, MI)); return result; } MCInst_clear(MI); result = decodeInstruction_2(DecoderTableThumbSBit16, MI, insn16, Address, NULL, ud->mode); if (result) { *Size = 2; InITBlock = ITStatus_instrInITBlock(&(ud->ITBlock)); Check(&result, AddThumbPredicate(ud, MI)); AddThumb1SBit(MI, InITBlock); return result; } MCInst_clear(MI); result = decodeInstruction_2(DecoderTableThumb216, MI, insn16, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 2; // Nested IT blocks are UNPREDICTABLE. Must be checked before we add // the Thumb predicate. if (MCInst_getOpcode(MI) == ARM_t2IT && ITStatus_instrInITBlock(&(ud->ITBlock))) result = MCDisassembler_SoftFail; Check(&result, AddThumbPredicate(ud, MI)); // If we find an IT instruction, we need to parse its condition // code and mask operands so that we can apply them correctly // to the subsequent instructions. if (MCInst_getOpcode(MI) == ARM_t2IT) { Firstcond = (unsigned int)MCOperand_getImm(MCInst_getOperand(MI, 0)); Mask = (unsigned int)MCOperand_getImm(MCInst_getOperand(MI, 1)); ITStatus_setITState(&(ud->ITBlock), (char)Firstcond, (char)Mask); } return result; } // We want to read exactly 4 bytes of data. if (code_len < 4) // not enough data return MCDisassembler_Fail; memcpy(bytes, code, 4); if (ud->big_endian) insn32 = (bytes[3] << 24) | (bytes[2] << 16) | (bytes[1] << 8) | (bytes[0] << 0); else insn32 = (bytes[3] << 8) | (bytes[2] << 0) | (bytes[1] << 24) | (bytes[0] << 16); MCInst_clear(MI); result = decodeInstruction_4(DecoderTableThumb32, MI, insn32, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; InITBlock = ITStatus_instrInITBlock(&(ud->ITBlock)); Check(&result, AddThumbPredicate(ud, MI)); AddThumb1SBit(MI, InITBlock); return result; } MCInst_clear(MI); result = decodeInstruction_4(DecoderTableThumb232, MI, insn32, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; Check(&result, AddThumbPredicate(ud, MI)); return result; } MCInst_clear(MI); result = decodeInstruction_4(DecoderTableVFP32, MI, insn32, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; UpdateThumbVFPPredicate(ud, MI); return result; } if (fieldFromInstruction_4(insn32, 28, 4) == 0xE) { MCInst_clear(MI); result = decodeInstruction_4(DecoderTableVFP32, MI, insn32, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; UpdateThumbVFPPredicate(ud, MI); return result; } } MCInst_clear(MI); result = decodeInstruction_4(DecoderTableVFPV832, MI, insn32, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; return result; } if (fieldFromInstruction_4(insn32, 28, 4) == 0xE) { MCInst_clear(MI); result = decodeInstruction_4(DecoderTableNEONDup32, MI, insn32, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; Check(&result, AddThumbPredicate(ud, MI)); return result; } } if (fieldFromInstruction_4(insn32, 24, 8) == 0xF9) { MCInst_clear(MI); NEONLdStInsn = insn32; NEONLdStInsn &= 0xF0FFFFFF; NEONLdStInsn |= 0x04000000; result = decodeInstruction_4(DecoderTableNEONLoadStore32, MI, NEONLdStInsn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; Check(&result, AddThumbPredicate(ud, MI)); return result; } } if (fieldFromInstruction_4(insn32, 24, 4) == 0xF) { MCInst_clear(MI); NEONDataInsn = insn32; NEONDataInsn &= 0xF0FFFFFF; // Clear bits 27-24 NEONDataInsn |= (NEONDataInsn & 0x10000000) >> 4; // Move bit 28 to bit 24 NEONDataInsn |= 0x12000000; // Set bits 28 and 25 result = decodeInstruction_4(DecoderTableNEONData32, MI, NEONDataInsn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; Check(&result, AddThumbPredicate(ud, MI)); return result; } } MCInst_clear(MI); NEONCryptoInsn = insn32; NEONCryptoInsn &= 0xF0FFFFFF; // Clear bits 27-24 NEONCryptoInsn |= (NEONCryptoInsn & 0x10000000) >> 4; // Move bit 28 to bit 24 NEONCryptoInsn |= 0x12000000; // Set bits 28 and 25 result = decodeInstruction_4(DecoderTablev8Crypto32, MI, NEONCryptoInsn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; return result; } MCInst_clear(MI); NEONv8Insn = insn32; NEONv8Insn &= 0xF3FFFFFF; // Clear bits 27-26 result = decodeInstruction_4(DecoderTablev8NEON32, MI, NEONv8Insn, Address, NULL, ud->mode); if (result != MCDisassembler_Fail) { *Size = 4; return result; } MCInst_clear(MI); *Size = 0; return MCDisassembler_Fail; } bool Thumb_getInstruction(csh ud, const uint8_t *code, size_t code_len, MCInst *instr, uint16_t *size, uint64_t address, void *info) { DecodeStatus status = _Thumb_getInstruction((cs_struct *)ud, instr, code, code_len, size, address); //return status == MCDisassembler_Success; return status != MCDisassembler_Fail; } bool ARM_getInstruction(csh ud, const uint8_t *code, size_t code_len, MCInst *instr, uint16_t *size, uint64_t address, void *info) { DecodeStatus status = _ARM_getInstruction((cs_struct *)ud, instr, code, code_len, size, address); //return status == MCDisassembler_Success; return status != MCDisassembler_Fail; } static const uint16_t GPRDecoderTable[] = { ARM_R0, ARM_R1, ARM_R2, ARM_R3, ARM_R4, ARM_R5, ARM_R6, ARM_R7, ARM_R8, ARM_R9, ARM_R10, ARM_R11, ARM_R12, ARM_SP, ARM_LR, ARM_PC }; static DecodeStatus DecodeGPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { unsigned Register; if (RegNo > 15) return MCDisassembler_Fail; Register = GPRDecoderTable[RegNo]; MCOperand_CreateReg0(Inst, Register); return MCDisassembler_Success; } static DecodeStatus DecodeGPRnopcRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; if (RegNo == 15) S = MCDisassembler_SoftFail; Check(&S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder)); return S; } static DecodeStatus DecodeGPRwithAPSRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; if (RegNo == 15) { MCOperand_CreateReg0(Inst, ARM_APSR_NZCV); return MCDisassembler_Success; } Check(&S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder)); return S; } static DecodeStatus DecodetGPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { if (RegNo > 7) return MCDisassembler_Fail; return DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder); } static const uint16_t GPRPairDecoderTable[] = { ARM_R0_R1, ARM_R2_R3, ARM_R4_R5, ARM_R6_R7, ARM_R8_R9, ARM_R10_R11, ARM_R12_SP }; static DecodeStatus DecodeGPRPairRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { unsigned RegisterPair; DecodeStatus S = MCDisassembler_Success; if (RegNo > 13) return MCDisassembler_Fail; if ((RegNo & 1) || RegNo == 0xe) S = MCDisassembler_SoftFail; RegisterPair = GPRPairDecoderTable[RegNo/2]; MCOperand_CreateReg0(Inst, RegisterPair); return S; } static DecodeStatus DecodetcGPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { unsigned Register = 0; switch (RegNo) { case 0: Register = ARM_R0; break; case 1: Register = ARM_R1; break; case 2: Register = ARM_R2; break; case 3: Register = ARM_R3; break; case 9: Register = ARM_R9; break; case 12: Register = ARM_R12; break; default: return MCDisassembler_Fail; } MCOperand_CreateReg0(Inst, Register); return MCDisassembler_Success; } static DecodeStatus DecoderGPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; if (RegNo == 13 || RegNo == 15) S = MCDisassembler_SoftFail; Check(&S, DecodeGPRRegisterClass(Inst, RegNo, Address, Decoder)); return S; } static const uint16_t SPRDecoderTable[] = { ARM_S0, ARM_S1, ARM_S2, ARM_S3, ARM_S4, ARM_S5, ARM_S6, ARM_S7, ARM_S8, ARM_S9, ARM_S10, ARM_S11, ARM_S12, ARM_S13, ARM_S14, ARM_S15, ARM_S16, ARM_S17, ARM_S18, ARM_S19, ARM_S20, ARM_S21, ARM_S22, ARM_S23, ARM_S24, ARM_S25, ARM_S26, ARM_S27, ARM_S28, ARM_S29, ARM_S30, ARM_S31 }; static DecodeStatus DecodeSPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { unsigned Register; if (RegNo > 31) return MCDisassembler_Fail; Register = SPRDecoderTable[RegNo]; MCOperand_CreateReg0(Inst, Register); return MCDisassembler_Success; } static const uint16_t DPRDecoderTable[] = { ARM_D0, ARM_D1, ARM_D2, ARM_D3, ARM_D4, ARM_D5, ARM_D6, ARM_D7, ARM_D8, ARM_D9, ARM_D10, ARM_D11, ARM_D12, ARM_D13, ARM_D14, ARM_D15, ARM_D16, ARM_D17, ARM_D18, ARM_D19, ARM_D20, ARM_D21, ARM_D22, ARM_D23, ARM_D24, ARM_D25, ARM_D26, ARM_D27, ARM_D28, ARM_D29, ARM_D30, ARM_D31 }; static DecodeStatus DecodeDPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { unsigned Register = 0; if (RegNo > 31) return MCDisassembler_Fail; Register = DPRDecoderTable[RegNo]; MCOperand_CreateReg0(Inst, Register); return MCDisassembler_Success; } static DecodeStatus DecodeDPR_8RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { if (RegNo > 7) return MCDisassembler_Fail; return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder); } static DecodeStatus DecodeDPR_VFP2RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { if (RegNo > 15) return MCDisassembler_Fail; return DecodeDPRRegisterClass(Inst, RegNo, Address, Decoder); } static const uint16_t QPRDecoderTable[] = { ARM_Q0, ARM_Q1, ARM_Q2, ARM_Q3, ARM_Q4, ARM_Q5, ARM_Q6, ARM_Q7, ARM_Q8, ARM_Q9, ARM_Q10, ARM_Q11, ARM_Q12, ARM_Q13, ARM_Q14, ARM_Q15 }; static DecodeStatus DecodeQPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { unsigned Register; if (RegNo > 31 || (RegNo & 1) != 0) return MCDisassembler_Fail; RegNo >>= 1; Register = QPRDecoderTable[RegNo]; MCOperand_CreateReg0(Inst, Register); return MCDisassembler_Success; } static const uint16_t DPairDecoderTable[] = { ARM_Q0, ARM_D1_D2, ARM_Q1, ARM_D3_D4, ARM_Q2, ARM_D5_D6, ARM_Q3, ARM_D7_D8, ARM_Q4, ARM_D9_D10, ARM_Q5, ARM_D11_D12, ARM_Q6, ARM_D13_D14, ARM_Q7, ARM_D15_D16, ARM_Q8, ARM_D17_D18, ARM_Q9, ARM_D19_D20, ARM_Q10, ARM_D21_D22, ARM_Q11, ARM_D23_D24, ARM_Q12, ARM_D25_D26, ARM_Q13, ARM_D27_D28, ARM_Q14, ARM_D29_D30, ARM_Q15 }; static DecodeStatus DecodeDPairRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { unsigned Register; if (RegNo > 30) return MCDisassembler_Fail; Register = DPairDecoderTable[RegNo]; MCOperand_CreateReg0(Inst, Register); return MCDisassembler_Success; } static const uint16_t DPairSpacedDecoderTable[] = { ARM_D0_D2, ARM_D1_D3, ARM_D2_D4, ARM_D3_D5, ARM_D4_D6, ARM_D5_D7, ARM_D6_D8, ARM_D7_D9, ARM_D8_D10, ARM_D9_D11, ARM_D10_D12, ARM_D11_D13, ARM_D12_D14, ARM_D13_D15, ARM_D14_D16, ARM_D15_D17, ARM_D16_D18, ARM_D17_D19, ARM_D18_D20, ARM_D19_D21, ARM_D20_D22, ARM_D21_D23, ARM_D22_D24, ARM_D23_D25, ARM_D24_D26, ARM_D25_D27, ARM_D26_D28, ARM_D27_D29, ARM_D28_D30, ARM_D29_D31 }; static DecodeStatus DecodeDPairSpacedRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, const void *Decoder) { unsigned Register; if (RegNo > 29) return MCDisassembler_Fail; Register = DPairSpacedDecoderTable[RegNo]; MCOperand_CreateReg0(Inst, Register); return MCDisassembler_Success; } static DecodeStatus DecodeCCOutOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { if (Val) MCOperand_CreateReg0(Inst, ARM_CPSR); else MCOperand_CreateReg0(Inst, 0); return MCDisassembler_Success; } static DecodeStatus DecodeSOImmOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { uint32_t imm = Val & 0xFF; uint32_t rot = (Val & 0xF00) >> 7; uint32_t rot_imm = (imm >> rot) | (imm << ((32-rot) & 0x1F)); MCOperand_CreateImm0(Inst, rot_imm); return MCDisassembler_Success; } static DecodeStatus DecodeSORegImmOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; ARM_AM_ShiftOpc Shift; unsigned Op; unsigned Rm = fieldFromInstruction_4(Val, 0, 4); unsigned type = fieldFromInstruction_4(Val, 5, 2); unsigned imm = fieldFromInstruction_4(Val, 7, 5); // Register-immediate if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; Shift = ARM_AM_lsl; switch (type) { case 0: Shift = ARM_AM_lsl; break; case 1: Shift = ARM_AM_lsr; break; case 2: Shift = ARM_AM_asr; break; case 3: Shift = ARM_AM_ror; break; } if (Shift == ARM_AM_ror && imm == 0) Shift = ARM_AM_rrx; Op = Shift | (imm << 3); MCOperand_CreateImm0(Inst, Op); return S; } static DecodeStatus DecodeSORegRegOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; ARM_AM_ShiftOpc Shift; unsigned Rm = fieldFromInstruction_4(Val, 0, 4); unsigned type = fieldFromInstruction_4(Val, 5, 2); unsigned Rs = fieldFromInstruction_4(Val, 8, 4); // Register-register if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rs, Address, Decoder))) return MCDisassembler_Fail; Shift = ARM_AM_lsl; switch (type) { case 0: Shift = ARM_AM_lsl; break; case 1: Shift = ARM_AM_lsr; break; case 2: Shift = ARM_AM_asr; break; case 3: Shift = ARM_AM_ror; break; } MCOperand_CreateImm0(Inst, Shift); return S; } static DecodeStatus DecodeRegListOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { unsigned i; DecodeStatus S = MCDisassembler_Success; unsigned opcode = 0; bool NeedDisjointWriteback = false; unsigned WritebackReg = 0; opcode = MCInst_getOpcode(Inst); switch (opcode) { default: break; case ARM_LDMIA_UPD: case ARM_LDMDB_UPD: case ARM_LDMIB_UPD: case ARM_LDMDA_UPD: case ARM_t2LDMIA_UPD: case ARM_t2LDMDB_UPD: case ARM_t2STMIA_UPD: case ARM_t2STMDB_UPD: NeedDisjointWriteback = true; WritebackReg = MCOperand_getReg(MCInst_getOperand(Inst, 0)); break; } // Empty register lists are not allowed. if (Val == 0) return MCDisassembler_Fail; for (i = 0; i < 16; ++i) { if (Val & (1 << i)) { if (!Check(&S, DecodeGPRRegisterClass(Inst, i, Address, Decoder))) return MCDisassembler_Fail; // Writeback not allowed if Rn is in the target list. if (NeedDisjointWriteback && WritebackReg == MCOperand_getReg(&(Inst->Operands[Inst->size-1]))) Check(&S, MCDisassembler_SoftFail); } } if (opcode == ARM_t2LDMIA_UPD && WritebackReg == ARM_SP) { if ( Val & (1 << ARM_SP) || ((Val & (1 << ARM_PC)) && (Val & (1 << ARM_LR)))) { // invalid thumb2 pop // needs no sp in reglist and not both pc and lr set at the same time return MCDisassembler_Fail; } } return S; } static DecodeStatus DecodeSPRRegListOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned i; unsigned Vd = fieldFromInstruction_4(Val, 8, 5); unsigned regs = fieldFromInstruction_4(Val, 0, 8); // In case of unpredictable encoding, tweak the operands. if (regs == 0 || (Vd + regs) > 32) { regs = Vd + regs > 32 ? 32 - Vd : regs; regs = (1u > regs? 1u : regs); S = MCDisassembler_SoftFail; } if (!Check(&S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder))) return MCDisassembler_Fail; for (i = 0; i < (regs - 1); ++i) { if (!Check(&S, DecodeSPRRegisterClass(Inst, ++Vd, Address, Decoder))) return MCDisassembler_Fail; } return S; } static DecodeStatus DecodeDPRRegListOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned i; unsigned Vd = fieldFromInstruction_4(Val, 8, 5); unsigned regs = fieldFromInstruction_4(Val, 1, 7); // In case of unpredictable encoding, tweak the operands. if (regs == 0 || regs > 16 || (Vd + regs) > 32) { regs = Vd + regs > 32 ? 32 - Vd : regs; regs = (1u > regs? 1u : regs); regs = (16u > regs? regs : 16u); S = MCDisassembler_SoftFail; } if (!Check(&S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder))) return MCDisassembler_Fail; for (i = 0; i < (regs - 1); ++i) { if (!Check(&S, DecodeDPRRegisterClass(Inst, ++Vd, Address, Decoder))) return MCDisassembler_Fail; } return S; } static DecodeStatus DecodeBitfieldMaskOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { // This operand encodes a mask of contiguous zeros between a specified MSB // and LSB. To decode it, we create the mask of all bits MSB-and-lower, // the mask of all bits LSB-and-lower, and then xor them to create // the mask of that's all ones on [msb, lsb]. Finally we not it to // create the final mask. unsigned msb = fieldFromInstruction_4(Val, 5, 5); unsigned lsb = fieldFromInstruction_4(Val, 0, 5); uint32_t lsb_mask, msb_mask; DecodeStatus S = MCDisassembler_Success; if (lsb > msb) { Check(&S, MCDisassembler_SoftFail); // The check above will cause the warning for the "potentially undefined // instruction encoding" but we can't build a bad MCOperand value here // with a lsb > msb or else printing the MCInst will cause a crash. lsb = msb; } msb_mask = 0xFFFFFFFF; if (msb != 31) msb_mask = (1U << (msb+1)) - 1; lsb_mask = (1U << lsb) - 1; MCOperand_CreateImm0(Inst, ~(msb_mask ^ lsb_mask)); return S; } static DecodeStatus DecodeCopMemInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned pred = fieldFromInstruction_4(Insn, 28, 4); unsigned CRd = fieldFromInstruction_4(Insn, 12, 4); unsigned coproc = fieldFromInstruction_4(Insn, 8, 4); unsigned imm = fieldFromInstruction_4(Insn, 0, 8); unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned U = fieldFromInstruction_4(Insn, 23, 1); switch (MCInst_getOpcode(Inst)) { case ARM_LDC_OFFSET: case ARM_LDC_PRE: case ARM_LDC_POST: case ARM_LDC_OPTION: case ARM_LDCL_OFFSET: case ARM_LDCL_PRE: case ARM_LDCL_POST: case ARM_LDCL_OPTION: case ARM_STC_OFFSET: case ARM_STC_PRE: case ARM_STC_POST: case ARM_STC_OPTION: case ARM_STCL_OFFSET: case ARM_STCL_PRE: case ARM_STCL_POST: case ARM_STCL_OPTION: case ARM_t2LDC_OFFSET: case ARM_t2LDC_PRE: case ARM_t2LDC_POST: case ARM_t2LDC_OPTION: case ARM_t2LDCL_OFFSET: case ARM_t2LDCL_PRE: case ARM_t2LDCL_POST: case ARM_t2LDCL_OPTION: case ARM_t2STC_OFFSET: case ARM_t2STC_PRE: case ARM_t2STC_POST: case ARM_t2STC_OPTION: case ARM_t2STCL_OFFSET: case ARM_t2STCL_PRE: case ARM_t2STCL_POST: case ARM_t2STCL_OPTION: if (coproc == 0xA || coproc == 0xB) return MCDisassembler_Fail; break; default: break; } MCOperand_CreateImm0(Inst, coproc); MCOperand_CreateImm0(Inst, CRd); if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; switch (MCInst_getOpcode(Inst)) { case ARM_t2LDC2_OFFSET: case ARM_t2LDC2L_OFFSET: case ARM_t2LDC2_PRE: case ARM_t2LDC2L_PRE: case ARM_t2STC2_OFFSET: case ARM_t2STC2L_OFFSET: case ARM_t2STC2_PRE: case ARM_t2STC2L_PRE: case ARM_LDC2_OFFSET: case ARM_LDC2L_OFFSET: case ARM_LDC2_PRE: case ARM_LDC2L_PRE: case ARM_STC2_OFFSET: case ARM_STC2L_OFFSET: case ARM_STC2_PRE: case ARM_STC2L_PRE: case ARM_t2LDC_OFFSET: case ARM_t2LDCL_OFFSET: case ARM_t2LDC_PRE: case ARM_t2LDCL_PRE: case ARM_t2STC_OFFSET: case ARM_t2STCL_OFFSET: case ARM_t2STC_PRE: case ARM_t2STCL_PRE: case ARM_LDC_OFFSET: case ARM_LDCL_OFFSET: case ARM_LDC_PRE: case ARM_LDCL_PRE: case ARM_STC_OFFSET: case ARM_STCL_OFFSET: case ARM_STC_PRE: case ARM_STCL_PRE: imm = ARM_AM_getAM5Opc(U ? ARM_AM_add : ARM_AM_sub, (unsigned char)imm); MCOperand_CreateImm0(Inst, imm); break; case ARM_t2LDC2_POST: case ARM_t2LDC2L_POST: case ARM_t2STC2_POST: case ARM_t2STC2L_POST: case ARM_LDC2_POST: case ARM_LDC2L_POST: case ARM_STC2_POST: case ARM_STC2L_POST: case ARM_t2LDC_POST: case ARM_t2LDCL_POST: case ARM_t2STC_POST: case ARM_t2STCL_POST: case ARM_LDC_POST: case ARM_LDCL_POST: case ARM_STC_POST: case ARM_STCL_POST: imm |= U << 8; // fall through. default: // The 'option' variant doesn't encode 'U' in the immediate since // the immediate is unsigned [0,255]. MCOperand_CreateImm0(Inst, imm); break; } switch (MCInst_getOpcode(Inst)) { case ARM_LDC_OFFSET: case ARM_LDC_PRE: case ARM_LDC_POST: case ARM_LDC_OPTION: case ARM_LDCL_OFFSET: case ARM_LDCL_PRE: case ARM_LDCL_POST: case ARM_LDCL_OPTION: case ARM_STC_OFFSET: case ARM_STC_PRE: case ARM_STC_POST: case ARM_STC_OPTION: case ARM_STCL_OFFSET: case ARM_STCL_PRE: case ARM_STCL_POST: case ARM_STCL_OPTION: if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } return S; } static DecodeStatus DecodeAddrMode2IdxInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; ARM_AM_AddrOpc Op; ARM_AM_ShiftOpc Opc; bool writeback; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned imm = fieldFromInstruction_4(Insn, 0, 12); unsigned pred = fieldFromInstruction_4(Insn, 28, 4); unsigned reg = fieldFromInstruction_4(Insn, 25, 1); unsigned P = fieldFromInstruction_4(Insn, 24, 1); unsigned W = fieldFromInstruction_4(Insn, 21, 1); unsigned idx_mode = 0, amt, tmp; // On stores, the writeback operand precedes Rt. switch (MCInst_getOpcode(Inst)) { case ARM_STR_POST_IMM: case ARM_STR_POST_REG: case ARM_STRB_POST_IMM: case ARM_STRB_POST_REG: case ARM_STRT_POST_REG: case ARM_STRT_POST_IMM: case ARM_STRBT_POST_REG: case ARM_STRBT_POST_IMM: if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; // On loads, the writeback operand comes after Rt. switch (MCInst_getOpcode(Inst)) { case ARM_LDR_POST_IMM: case ARM_LDR_POST_REG: case ARM_LDRB_POST_IMM: case ARM_LDRB_POST_REG: case ARM_LDRBT_POST_REG: case ARM_LDRBT_POST_IMM: case ARM_LDRT_POST_REG: case ARM_LDRT_POST_IMM: if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; Op = ARM_AM_add; if (!fieldFromInstruction_4(Insn, 23, 1)) Op = ARM_AM_sub; writeback = (P == 0) || (W == 1); if (P && writeback) idx_mode = ARMII_IndexModePre; else if (!P && writeback) idx_mode = ARMII_IndexModePost; if (writeback && (Rn == 15 || Rn == Rt)) S = MCDisassembler_SoftFail; // UNPREDICTABLE if (reg) { if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; Opc = ARM_AM_lsl; switch( fieldFromInstruction_4(Insn, 5, 2)) { case 0: Opc = ARM_AM_lsl; break; case 1: Opc = ARM_AM_lsr; break; case 2: Opc = ARM_AM_asr; break; case 3: Opc = ARM_AM_ror; break; default: return MCDisassembler_Fail; } amt = fieldFromInstruction_4(Insn, 7, 5); if (Opc == ARM_AM_ror && amt == 0) Opc = ARM_AM_rrx; imm = ARM_AM_getAM2Opc(Op, amt, Opc, idx_mode); MCOperand_CreateImm0(Inst, imm); } else { MCOperand_CreateReg0(Inst, 0); tmp = ARM_AM_getAM2Opc(Op, imm, ARM_AM_lsl, idx_mode); MCOperand_CreateImm0(Inst, tmp); } if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeSORegMemOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; ARM_AM_ShiftOpc ShOp; unsigned shift; unsigned Rn = fieldFromInstruction_4(Val, 13, 4); unsigned Rm = fieldFromInstruction_4(Val, 0, 4); unsigned type = fieldFromInstruction_4(Val, 5, 2); unsigned imm = fieldFromInstruction_4(Val, 7, 5); unsigned U = fieldFromInstruction_4(Val, 12, 1); ShOp = ARM_AM_lsl; switch (type) { case 0: ShOp = ARM_AM_lsl; break; case 1: ShOp = ARM_AM_lsr; break; case 2: ShOp = ARM_AM_asr; break; case 3: ShOp = ARM_AM_ror; break; } if (ShOp == ARM_AM_ror && imm == 0) ShOp = ARM_AM_rrx; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; if (U) shift = ARM_AM_getAM2Opc(ARM_AM_add, imm, ShOp, 0); else shift = ARM_AM_getAM2Opc(ARM_AM_sub, imm, ShOp, 0); MCOperand_CreateImm0(Inst, shift); return S; } static DecodeStatus DecodeAddrMode3Instruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned type = fieldFromInstruction_4(Insn, 22, 1); unsigned imm = fieldFromInstruction_4(Insn, 8, 4); unsigned U = ((~fieldFromInstruction_4(Insn, 23, 1)) & 1) << 8; unsigned pred = fieldFromInstruction_4(Insn, 28, 4); unsigned W = fieldFromInstruction_4(Insn, 21, 1); unsigned P = fieldFromInstruction_4(Insn, 24, 1); unsigned Rt2 = Rt + 1; bool writeback = (W == 1) | (P == 0); // For {LD,ST}RD, Rt must be even, else undefined. switch (MCInst_getOpcode(Inst)) { case ARM_STRD: case ARM_STRD_PRE: case ARM_STRD_POST: case ARM_LDRD: case ARM_LDRD_PRE: case ARM_LDRD_POST: if (Rt & 0x1) S = MCDisassembler_SoftFail; break; default: break; } switch (MCInst_getOpcode(Inst)) { case ARM_STRD: case ARM_STRD_PRE: case ARM_STRD_POST: if (P == 0 && W == 1) S = MCDisassembler_SoftFail; if (writeback && (Rn == 15 || Rn == Rt || Rn == Rt2)) S = MCDisassembler_SoftFail; if (type && Rm == 15) S = MCDisassembler_SoftFail; if (Rt2 == 15) S = MCDisassembler_SoftFail; if (!type && fieldFromInstruction_4(Insn, 8, 4)) S = MCDisassembler_SoftFail; break; case ARM_STRH: case ARM_STRH_PRE: case ARM_STRH_POST: if (Rt == 15) S = MCDisassembler_SoftFail; if (writeback && (Rn == 15 || Rn == Rt)) S = MCDisassembler_SoftFail; if (!type && Rm == 15) S = MCDisassembler_SoftFail; break; case ARM_LDRD: case ARM_LDRD_PRE: case ARM_LDRD_POST: if (type && Rn == 15){ if (Rt2 == 15) S = MCDisassembler_SoftFail; break; } if (P == 0 && W == 1) S = MCDisassembler_SoftFail; if (!type && (Rt2 == 15 || Rm == 15 || Rm == Rt || Rm == Rt2)) S = MCDisassembler_SoftFail; if (!type && writeback && Rn == 15) S = MCDisassembler_SoftFail; if (writeback && (Rn == Rt || Rn == Rt2)) S = MCDisassembler_SoftFail; break; case ARM_LDRH: case ARM_LDRH_PRE: case ARM_LDRH_POST: if (type && Rn == 15){ if (Rt == 15) S = MCDisassembler_SoftFail; break; } if (Rt == 15) S = MCDisassembler_SoftFail; if (!type && Rm == 15) S = MCDisassembler_SoftFail; if (!type && writeback && (Rn == 15 || Rn == Rt)) S = MCDisassembler_SoftFail; break; case ARM_LDRSH: case ARM_LDRSH_PRE: case ARM_LDRSH_POST: case ARM_LDRSB: case ARM_LDRSB_PRE: case ARM_LDRSB_POST: if (type && Rn == 15){ if (Rt == 15) S = MCDisassembler_SoftFail; break; } if (type && (Rt == 15 || (writeback && Rn == Rt))) S = MCDisassembler_SoftFail; if (!type && (Rt == 15 || Rm == 15)) S = MCDisassembler_SoftFail; if (!type && writeback && (Rn == 15 || Rn == Rt)) S = MCDisassembler_SoftFail; break; default: break; } if (writeback) { // Writeback if (P) U |= ARMII_IndexModePre << 9; else U |= ARMII_IndexModePost << 9; // On stores, the writeback operand precedes Rt. switch (MCInst_getOpcode(Inst)) { case ARM_STRD: case ARM_STRD_PRE: case ARM_STRD_POST: case ARM_STRH: case ARM_STRH_PRE: case ARM_STRH_POST: if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; switch (MCInst_getOpcode(Inst)) { case ARM_STRD: case ARM_STRD_PRE: case ARM_STRD_POST: case ARM_LDRD: case ARM_LDRD_PRE: case ARM_LDRD_POST: if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt+1, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } if (writeback) { // On loads, the writeback operand comes after Rt. switch (MCInst_getOpcode(Inst)) { case ARM_LDRD: case ARM_LDRD_PRE: case ARM_LDRD_POST: case ARM_LDRH: case ARM_LDRH_PRE: case ARM_LDRH_POST: case ARM_LDRSH: case ARM_LDRSH_PRE: case ARM_LDRSH_POST: case ARM_LDRSB: case ARM_LDRSB_PRE: case ARM_LDRSB_POST: case ARM_LDRHTr: case ARM_LDRSBTr: if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (type) { MCOperand_CreateReg0(Inst, 0); MCOperand_CreateImm0(Inst, U | (imm << 4) | Rm); } else { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, U); } if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeRFEInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned mode = fieldFromInstruction_4(Insn, 23, 2); switch (mode) { case 0: mode = ARM_AM_da; break; case 1: mode = ARM_AM_ia; break; case 2: mode = ARM_AM_db; break; case 3: mode = ARM_AM_ib; break; } MCOperand_CreateImm0(Inst, mode); if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeQADDInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned pred = fieldFromInstruction_4(Insn, 28, 4); if (pred == 0xF) return DecodeCPSInstruction(Inst, Insn, Address, Decoder); if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeMemMultipleWritebackInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned pred = fieldFromInstruction_4(Insn, 28, 4); unsigned reglist = fieldFromInstruction_4(Insn, 0, 16); if (pred == 0xF) { // Ambiguous with RFE and SRS switch (MCInst_getOpcode(Inst)) { case ARM_LDMDA: MCInst_setOpcode(Inst, ARM_RFEDA); break; case ARM_LDMDA_UPD: MCInst_setOpcode(Inst, ARM_RFEDA_UPD); break; case ARM_LDMDB: MCInst_setOpcode(Inst, ARM_RFEDB); break; case ARM_LDMDB_UPD: MCInst_setOpcode(Inst, ARM_RFEDB_UPD); break; case ARM_LDMIA: MCInst_setOpcode(Inst, ARM_RFEIA); break; case ARM_LDMIA_UPD: MCInst_setOpcode(Inst, ARM_RFEIA_UPD); break; case ARM_LDMIB: MCInst_setOpcode(Inst, ARM_RFEIB); break; case ARM_LDMIB_UPD: MCInst_setOpcode(Inst, ARM_RFEIB_UPD); break; case ARM_STMDA: MCInst_setOpcode(Inst, ARM_SRSDA); break; case ARM_STMDA_UPD: MCInst_setOpcode(Inst, ARM_SRSDA_UPD); break; case ARM_STMDB: MCInst_setOpcode(Inst, ARM_SRSDB); break; case ARM_STMDB_UPD: MCInst_setOpcode(Inst, ARM_SRSDB_UPD); break; case ARM_STMIA: MCInst_setOpcode(Inst, ARM_SRSIA); break; case ARM_STMIA_UPD: MCInst_setOpcode(Inst, ARM_SRSIA_UPD); break; case ARM_STMIB: MCInst_setOpcode(Inst, ARM_SRSIB); break; case ARM_STMIB_UPD: MCInst_setOpcode(Inst, ARM_SRSIB_UPD); break; default: return MCDisassembler_Fail; } // For stores (which become SRS's, the only operand is the mode. if (fieldFromInstruction_4(Insn, 20, 1) == 0) { // Check SRS encoding constraints if (!(fieldFromInstruction_4(Insn, 22, 1) == 1 && fieldFromInstruction_4(Insn, 20, 1) == 0)) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, fieldFromInstruction_4(Insn, 0, 4)); return S; } return DecodeRFEInstruction(Inst, Insn, Address, Decoder); } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; // Tied if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeRegListOperand(Inst, reglist, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeCPSInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { unsigned imod = fieldFromInstruction_4(Insn, 18, 2); unsigned M = fieldFromInstruction_4(Insn, 17, 1); unsigned iflags = fieldFromInstruction_4(Insn, 6, 3); unsigned mode = fieldFromInstruction_4(Insn, 0, 5); DecodeStatus S = MCDisassembler_Success; // This decoder is called from multiple location that do not check // the full encoding is valid before they do. if (fieldFromInstruction_4(Insn, 5, 1) != 0 || fieldFromInstruction_4(Insn, 16, 1) != 0 || fieldFromInstruction_4(Insn, 20, 8) != 0x10) return MCDisassembler_Fail; // imod == '01' --> UNPREDICTABLE // NOTE: Even though this is technically UNPREDICTABLE, we choose to // return failure here. The '01' imod value is unprintable, so there's // nothing useful we could do even if we returned UNPREDICTABLE. if (imod == 1) return MCDisassembler_Fail; if (imod && M) { MCInst_setOpcode(Inst, ARM_CPS3p); MCOperand_CreateImm0(Inst, imod); MCOperand_CreateImm0(Inst, iflags); MCOperand_CreateImm0(Inst, mode); } else if (imod && !M) { MCInst_setOpcode(Inst, ARM_CPS2p); MCOperand_CreateImm0(Inst, imod); MCOperand_CreateImm0(Inst, iflags); if (mode) S = MCDisassembler_SoftFail; } else if (!imod && M) { MCInst_setOpcode(Inst, ARM_CPS1p); MCOperand_CreateImm0(Inst, mode); if (iflags) S = MCDisassembler_SoftFail; } else { // imod == '00' && M == '0' --> UNPREDICTABLE MCInst_setOpcode(Inst, ARM_CPS1p); MCOperand_CreateImm0(Inst, mode); S = MCDisassembler_SoftFail; } return S; } static DecodeStatus DecodeT2CPSInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { unsigned imod = fieldFromInstruction_4(Insn, 9, 2); unsigned M = fieldFromInstruction_4(Insn, 8, 1); unsigned iflags = fieldFromInstruction_4(Insn, 5, 3); unsigned mode = fieldFromInstruction_4(Insn, 0, 5); DecodeStatus S = MCDisassembler_Success; // imod == '01' --> UNPREDICTABLE // NOTE: Even though this is technically UNPREDICTABLE, we choose to // return failure here. The '01' imod value is unprintable, so there's // nothing useful we could do even if we returned UNPREDICTABLE. if (imod == 1) return MCDisassembler_Fail; if (imod && M) { MCInst_setOpcode(Inst, ARM_t2CPS3p); MCOperand_CreateImm0(Inst, imod); MCOperand_CreateImm0(Inst, iflags); MCOperand_CreateImm0(Inst, mode); } else if (imod && !M) { MCInst_setOpcode(Inst, ARM_t2CPS2p); MCOperand_CreateImm0(Inst, imod); MCOperand_CreateImm0(Inst, iflags); if (mode) S = MCDisassembler_SoftFail; } else if (!imod && M) { MCInst_setOpcode(Inst, ARM_t2CPS1p); MCOperand_CreateImm0(Inst, mode); if (iflags) S = MCDisassembler_SoftFail; } else { // imod == '00' && M == '0' --> this is a HINT instruction int imm = fieldFromInstruction_4(Insn, 0, 8); // HINT are defined only for immediate in [0..4] if(imm > 4) return MCDisassembler_Fail; MCInst_setOpcode(Inst, ARM_t2HINT); MCOperand_CreateImm0(Inst, imm); } return S; } static DecodeStatus DecodeT2MOVTWInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rd = fieldFromInstruction_4(Insn, 8, 4); unsigned imm = 0; imm |= (fieldFromInstruction_4(Insn, 0, 8) << 0); imm |= (fieldFromInstruction_4(Insn, 12, 3) << 8); imm |= (fieldFromInstruction_4(Insn, 16, 4) << 12); imm |= (fieldFromInstruction_4(Insn, 26, 1) << 11); if (MCInst_getOpcode(Inst) == ARM_t2MOVTi16) if (!Check(&S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, imm); return S; } static DecodeStatus DecodeArmMOVTWInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); unsigned pred = fieldFromInstruction_4(Insn, 28, 4); unsigned imm = 0; imm |= (fieldFromInstruction_4(Insn, 0, 12) << 0); imm |= (fieldFromInstruction_4(Insn, 16, 4) << 12); if (MCInst_getOpcode(Inst) == ARM_MOVTi16) if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, imm); if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeSMLAInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rd = fieldFromInstruction_4(Insn, 16, 4); unsigned Rn = fieldFromInstruction_4(Insn, 0, 4); unsigned Rm = fieldFromInstruction_4(Insn, 8, 4); unsigned Ra = fieldFromInstruction_4(Insn, 12, 4); unsigned pred = fieldFromInstruction_4(Insn, 28, 4); if (pred == 0xF) return DecodeCPSInstruction(Inst, Insn, Address, Decoder); if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Ra, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeAddrModeImm12Operand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned add = fieldFromInstruction_4(Val, 12, 1); unsigned imm = fieldFromInstruction_4(Val, 0, 12); unsigned Rn = fieldFromInstruction_4(Val, 13, 4); if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!add) imm *= (unsigned int)-1; if (imm == 0 && !add) imm = (unsigned int)INT32_MIN; MCOperand_CreateImm0(Inst, imm); //if (Rn == 15) // tryAddingPcLoadReferenceComment(Address, Address + imm + 8, Decoder); return S; } static DecodeStatus DecodeAddrMode5Operand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Val, 9, 4); unsigned U = fieldFromInstruction_4(Val, 8, 1); unsigned imm = fieldFromInstruction_4(Val, 0, 8); if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (U) MCOperand_CreateImm0(Inst, ARM_AM_getAM5Opc(ARM_AM_add, (unsigned char)imm)); else MCOperand_CreateImm0(Inst, ARM_AM_getAM5Opc(ARM_AM_sub, (unsigned char)imm)); return S; } static DecodeStatus DecodeAddrMode7Operand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { return DecodeGPRRegisterClass(Inst, Val, Address, Decoder); } static DecodeStatus DecodeT2BInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus Status = MCDisassembler_Success; // Note the J1 and J2 values are from the encoded instruction. So here // change them to I1 and I2 values via as documented: // I1 = NOT(J1 EOR S); // I2 = NOT(J2 EOR S); // and build the imm32 with one trailing zero as documented: // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32); unsigned S = fieldFromInstruction_4(Insn, 26, 1); unsigned J1 = fieldFromInstruction_4(Insn, 13, 1); unsigned J2 = fieldFromInstruction_4(Insn, 11, 1); unsigned I1 = !(J1 ^ S); unsigned I2 = !(J2 ^ S); unsigned imm10 = fieldFromInstruction_4(Insn, 16, 10); unsigned imm11 = fieldFromInstruction_4(Insn, 0, 11); unsigned tmp = (S << 23) | (I1 << 22) | (I2 << 21) | (imm10 << 11) | imm11; int imm32 = SignExtend32(tmp << 1, 25); MCOperand_CreateImm0(Inst, imm32); return Status; } static DecodeStatus DecodeBranchImmInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned pred = fieldFromInstruction_4(Insn, 28, 4); unsigned imm = fieldFromInstruction_4(Insn, 0, 24) << 2; if (pred == 0xF) { MCInst_setOpcode(Inst, ARM_BLXi); imm |= fieldFromInstruction_4(Insn, 24, 1) << 1; MCOperand_CreateImm0(Inst, SignExtend32(imm, 26)); return S; } MCOperand_CreateImm0(Inst, SignExtend32(imm, 26)); if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeAddrMode6Operand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rm = fieldFromInstruction_4(Val, 0, 4); unsigned align = fieldFromInstruction_4(Val, 4, 2); if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; if (!align) MCOperand_CreateImm0(Inst, 0); else MCOperand_CreateImm0(Inst, 4 << align); return S; } static DecodeStatus DecodeVLDInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned wb, Rn, Rm; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; wb = fieldFromInstruction_4(Insn, 16, 4); Rn = fieldFromInstruction_4(Insn, 16, 4); Rn |= fieldFromInstruction_4(Insn, 4, 2) << 4; Rm = fieldFromInstruction_4(Insn, 0, 4); // First output register switch (MCInst_getOpcode(Inst)) { case ARM_VLD1q16: case ARM_VLD1q32: case ARM_VLD1q64: case ARM_VLD1q8: case ARM_VLD1q16wb_fixed: case ARM_VLD1q16wb_register: case ARM_VLD1q32wb_fixed: case ARM_VLD1q32wb_register: case ARM_VLD1q64wb_fixed: case ARM_VLD1q64wb_register: case ARM_VLD1q8wb_fixed: case ARM_VLD1q8wb_register: case ARM_VLD2d16: case ARM_VLD2d32: case ARM_VLD2d8: case ARM_VLD2d16wb_fixed: case ARM_VLD2d16wb_register: case ARM_VLD2d32wb_fixed: case ARM_VLD2d32wb_register: case ARM_VLD2d8wb_fixed: case ARM_VLD2d8wb_register: if (!Check(&S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; break; case ARM_VLD2b16: case ARM_VLD2b32: case ARM_VLD2b8: case ARM_VLD2b16wb_fixed: case ARM_VLD2b16wb_register: case ARM_VLD2b32wb_fixed: case ARM_VLD2b32wb_register: case ARM_VLD2b8wb_fixed: case ARM_VLD2b8wb_register: if (!Check(&S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; break; default: if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; } // Second output register switch (MCInst_getOpcode(Inst)) { case ARM_VLD3d8: case ARM_VLD3d16: case ARM_VLD3d32: case ARM_VLD3d8_UPD: case ARM_VLD3d16_UPD: case ARM_VLD3d32_UPD: case ARM_VLD4d8: case ARM_VLD4d16: case ARM_VLD4d32: case ARM_VLD4d8_UPD: case ARM_VLD4d16_UPD: case ARM_VLD4d32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) return MCDisassembler_Fail; break; case ARM_VLD3q8: case ARM_VLD3q16: case ARM_VLD3q32: case ARM_VLD3q8_UPD: case ARM_VLD3q16_UPD: case ARM_VLD3q32_UPD: case ARM_VLD4q8: case ARM_VLD4q16: case ARM_VLD4q32: case ARM_VLD4q8_UPD: case ARM_VLD4q16_UPD: case ARM_VLD4q32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) return MCDisassembler_Fail; default: break; } // Third output register switch(MCInst_getOpcode(Inst)) { case ARM_VLD3d8: case ARM_VLD3d16: case ARM_VLD3d32: case ARM_VLD3d8_UPD: case ARM_VLD3d16_UPD: case ARM_VLD3d32_UPD: case ARM_VLD4d8: case ARM_VLD4d16: case ARM_VLD4d32: case ARM_VLD4d8_UPD: case ARM_VLD4d16_UPD: case ARM_VLD4d32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) return MCDisassembler_Fail; break; case ARM_VLD3q8: case ARM_VLD3q16: case ARM_VLD3q32: case ARM_VLD3q8_UPD: case ARM_VLD3q16_UPD: case ARM_VLD3q32_UPD: case ARM_VLD4q8: case ARM_VLD4q16: case ARM_VLD4q32: case ARM_VLD4q8_UPD: case ARM_VLD4q16_UPD: case ARM_VLD4q32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } // Fourth output register switch (MCInst_getOpcode(Inst)) { case ARM_VLD4d8: case ARM_VLD4d16: case ARM_VLD4d32: case ARM_VLD4d8_UPD: case ARM_VLD4d16_UPD: case ARM_VLD4d32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) return MCDisassembler_Fail; break; case ARM_VLD4q8: case ARM_VLD4q16: case ARM_VLD4q32: case ARM_VLD4q8_UPD: case ARM_VLD4q16_UPD: case ARM_VLD4q32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } // Writeback operand switch (MCInst_getOpcode(Inst)) { case ARM_VLD1d8wb_fixed: case ARM_VLD1d16wb_fixed: case ARM_VLD1d32wb_fixed: case ARM_VLD1d64wb_fixed: case ARM_VLD1d8wb_register: case ARM_VLD1d16wb_register: case ARM_VLD1d32wb_register: case ARM_VLD1d64wb_register: case ARM_VLD1q8wb_fixed: case ARM_VLD1q16wb_fixed: case ARM_VLD1q32wb_fixed: case ARM_VLD1q64wb_fixed: case ARM_VLD1q8wb_register: case ARM_VLD1q16wb_register: case ARM_VLD1q32wb_register: case ARM_VLD1q64wb_register: case ARM_VLD1d8Twb_fixed: case ARM_VLD1d8Twb_register: case ARM_VLD1d16Twb_fixed: case ARM_VLD1d16Twb_register: case ARM_VLD1d32Twb_fixed: case ARM_VLD1d32Twb_register: case ARM_VLD1d64Twb_fixed: case ARM_VLD1d64Twb_register: case ARM_VLD1d8Qwb_fixed: case ARM_VLD1d8Qwb_register: case ARM_VLD1d16Qwb_fixed: case ARM_VLD1d16Qwb_register: case ARM_VLD1d32Qwb_fixed: case ARM_VLD1d32Qwb_register: case ARM_VLD1d64Qwb_fixed: case ARM_VLD1d64Qwb_register: case ARM_VLD2d8wb_fixed: case ARM_VLD2d16wb_fixed: case ARM_VLD2d32wb_fixed: case ARM_VLD2q8wb_fixed: case ARM_VLD2q16wb_fixed: case ARM_VLD2q32wb_fixed: case ARM_VLD2d8wb_register: case ARM_VLD2d16wb_register: case ARM_VLD2d32wb_register: case ARM_VLD2q8wb_register: case ARM_VLD2q16wb_register: case ARM_VLD2q32wb_register: case ARM_VLD2b8wb_fixed: case ARM_VLD2b16wb_fixed: case ARM_VLD2b32wb_fixed: case ARM_VLD2b8wb_register: case ARM_VLD2b16wb_register: case ARM_VLD2b32wb_register: MCOperand_CreateImm0(Inst, 0); break; case ARM_VLD3d8_UPD: case ARM_VLD3d16_UPD: case ARM_VLD3d32_UPD: case ARM_VLD3q8_UPD: case ARM_VLD3q16_UPD: case ARM_VLD3q32_UPD: case ARM_VLD4d8_UPD: case ARM_VLD4d16_UPD: case ARM_VLD4d32_UPD: case ARM_VLD4q8_UPD: case ARM_VLD4q16_UPD: case ARM_VLD4q32_UPD: if (!Check(&S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } // AddrMode6 Base (register+alignment) if (!Check(&S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; // AddrMode6 Offset (register) switch (MCInst_getOpcode(Inst)) { default: // The below have been updated to have explicit am6offset split // between fixed and register offset. For those instructions not // yet updated, we need to add an additional reg0 operand for the // fixed variant. // // The fixed offset encodes as Rm == 0xd, so we check for that. if (Rm == 0xd) { MCOperand_CreateReg0(Inst, 0); break; } // Fall through to handle the register offset variant. case ARM_VLD1d8wb_fixed: case ARM_VLD1d16wb_fixed: case ARM_VLD1d32wb_fixed: case ARM_VLD1d64wb_fixed: case ARM_VLD1d8Twb_fixed: case ARM_VLD1d16Twb_fixed: case ARM_VLD1d32Twb_fixed: case ARM_VLD1d64Twb_fixed: case ARM_VLD1d8Qwb_fixed: case ARM_VLD1d16Qwb_fixed: case ARM_VLD1d32Qwb_fixed: case ARM_VLD1d64Qwb_fixed: case ARM_VLD1d8wb_register: case ARM_VLD1d16wb_register: case ARM_VLD1d32wb_register: case ARM_VLD1d64wb_register: case ARM_VLD1q8wb_fixed: case ARM_VLD1q16wb_fixed: case ARM_VLD1q32wb_fixed: case ARM_VLD1q64wb_fixed: case ARM_VLD1q8wb_register: case ARM_VLD1q16wb_register: case ARM_VLD1q32wb_register: case ARM_VLD1q64wb_register: // The fixed offset post-increment encodes Rm == 0xd. The no-writeback // variant encodes Rm == 0xf. Anything else is a register offset post- // increment and we need to add the register operand to the instruction. if (Rm != 0xD && Rm != 0xF && !Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; break; case ARM_VLD2d8wb_fixed: case ARM_VLD2d16wb_fixed: case ARM_VLD2d32wb_fixed: case ARM_VLD2b8wb_fixed: case ARM_VLD2b16wb_fixed: case ARM_VLD2b32wb_fixed: case ARM_VLD2q8wb_fixed: case ARM_VLD2q16wb_fixed: case ARM_VLD2q32wb_fixed: break; } return S; } static DecodeStatus DecodeVLDST1Instruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { unsigned load; unsigned type = fieldFromInstruction_4(Insn, 8, 4); unsigned align = fieldFromInstruction_4(Insn, 4, 2); if (type == 6 && (align & 2)) return MCDisassembler_Fail; if (type == 7 && (align & 2)) return MCDisassembler_Fail; if (type == 10 && align == 3) return MCDisassembler_Fail; load = fieldFromInstruction_4(Insn, 21, 1); return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder) : DecodeVSTInstruction(Inst, Insn, Address, Decoder); } static DecodeStatus DecodeVLDST2Instruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { unsigned type, align, load; unsigned size = fieldFromInstruction_4(Insn, 6, 2); if (size == 3) return MCDisassembler_Fail; type = fieldFromInstruction_4(Insn, 8, 4); align = fieldFromInstruction_4(Insn, 4, 2); if (type == 8 && align == 3) return MCDisassembler_Fail; if (type == 9 && align == 3) return MCDisassembler_Fail; load = fieldFromInstruction_4(Insn, 21, 1); return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder) : DecodeVSTInstruction(Inst, Insn, Address, Decoder); } static DecodeStatus DecodeVLDST3Instruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { unsigned align, load; unsigned size = fieldFromInstruction_4(Insn, 6, 2); if (size == 3) return MCDisassembler_Fail; align = fieldFromInstruction_4(Insn, 4, 2); if (align & 2) return MCDisassembler_Fail; load = fieldFromInstruction_4(Insn, 21, 1); return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder) : DecodeVSTInstruction(Inst, Insn, Address, Decoder); } static DecodeStatus DecodeVLDST4Instruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { unsigned load; unsigned size = fieldFromInstruction_4(Insn, 6, 2); if (size == 3) return MCDisassembler_Fail; load = fieldFromInstruction_4(Insn, 21, 1); return load ? DecodeVLDInstruction(Inst, Insn, Address, Decoder) : DecodeVSTInstruction(Inst, Insn, Address, Decoder); } static DecodeStatus DecodeVSTInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned wb, Rn, Rm; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; wb = fieldFromInstruction_4(Insn, 16, 4); Rn = fieldFromInstruction_4(Insn, 16, 4); Rn |= fieldFromInstruction_4(Insn, 4, 2) << 4; Rm = fieldFromInstruction_4(Insn, 0, 4); // Writeback Operand switch (MCInst_getOpcode(Inst)) { case ARM_VST1d8wb_fixed: case ARM_VST1d16wb_fixed: case ARM_VST1d32wb_fixed: case ARM_VST1d64wb_fixed: case ARM_VST1d8wb_register: case ARM_VST1d16wb_register: case ARM_VST1d32wb_register: case ARM_VST1d64wb_register: case ARM_VST1q8wb_fixed: case ARM_VST1q16wb_fixed: case ARM_VST1q32wb_fixed: case ARM_VST1q64wb_fixed: case ARM_VST1q8wb_register: case ARM_VST1q16wb_register: case ARM_VST1q32wb_register: case ARM_VST1q64wb_register: case ARM_VST1d8Twb_fixed: case ARM_VST1d16Twb_fixed: case ARM_VST1d32Twb_fixed: case ARM_VST1d64Twb_fixed: case ARM_VST1d8Twb_register: case ARM_VST1d16Twb_register: case ARM_VST1d32Twb_register: case ARM_VST1d64Twb_register: case ARM_VST1d8Qwb_fixed: case ARM_VST1d16Qwb_fixed: case ARM_VST1d32Qwb_fixed: case ARM_VST1d64Qwb_fixed: case ARM_VST1d8Qwb_register: case ARM_VST1d16Qwb_register: case ARM_VST1d32Qwb_register: case ARM_VST1d64Qwb_register: case ARM_VST2d8wb_fixed: case ARM_VST2d16wb_fixed: case ARM_VST2d32wb_fixed: case ARM_VST2d8wb_register: case ARM_VST2d16wb_register: case ARM_VST2d32wb_register: case ARM_VST2q8wb_fixed: case ARM_VST2q16wb_fixed: case ARM_VST2q32wb_fixed: case ARM_VST2q8wb_register: case ARM_VST2q16wb_register: case ARM_VST2q32wb_register: case ARM_VST2b8wb_fixed: case ARM_VST2b16wb_fixed: case ARM_VST2b32wb_fixed: case ARM_VST2b8wb_register: case ARM_VST2b16wb_register: case ARM_VST2b32wb_register: if (Rm == 0xF) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, 0); break; case ARM_VST3d8_UPD: case ARM_VST3d16_UPD: case ARM_VST3d32_UPD: case ARM_VST3q8_UPD: case ARM_VST3q16_UPD: case ARM_VST3q32_UPD: case ARM_VST4d8_UPD: case ARM_VST4d16_UPD: case ARM_VST4d32_UPD: case ARM_VST4q8_UPD: case ARM_VST4q16_UPD: case ARM_VST4q32_UPD: if (!Check(&S, DecodeGPRRegisterClass(Inst, wb, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } // AddrMode6 Base (register+alignment) if (!Check(&S, DecodeAddrMode6Operand(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; // AddrMode6 Offset (register) switch (MCInst_getOpcode(Inst)) { default: if (Rm == 0xD) MCOperand_CreateReg0(Inst, 0); else if (Rm != 0xF) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } break; case ARM_VST1d8wb_fixed: case ARM_VST1d16wb_fixed: case ARM_VST1d32wb_fixed: case ARM_VST1d64wb_fixed: case ARM_VST1q8wb_fixed: case ARM_VST1q16wb_fixed: case ARM_VST1q32wb_fixed: case ARM_VST1q64wb_fixed: case ARM_VST1d8Twb_fixed: case ARM_VST1d16Twb_fixed: case ARM_VST1d32Twb_fixed: case ARM_VST1d64Twb_fixed: case ARM_VST1d8Qwb_fixed: case ARM_VST1d16Qwb_fixed: case ARM_VST1d32Qwb_fixed: case ARM_VST1d64Qwb_fixed: case ARM_VST2d8wb_fixed: case ARM_VST2d16wb_fixed: case ARM_VST2d32wb_fixed: case ARM_VST2q8wb_fixed: case ARM_VST2q16wb_fixed: case ARM_VST2q32wb_fixed: case ARM_VST2b8wb_fixed: case ARM_VST2b16wb_fixed: case ARM_VST2b32wb_fixed: break; } // First input register switch (MCInst_getOpcode(Inst)) { case ARM_VST1q16: case ARM_VST1q32: case ARM_VST1q64: case ARM_VST1q8: case ARM_VST1q16wb_fixed: case ARM_VST1q16wb_register: case ARM_VST1q32wb_fixed: case ARM_VST1q32wb_register: case ARM_VST1q64wb_fixed: case ARM_VST1q64wb_register: case ARM_VST1q8wb_fixed: case ARM_VST1q8wb_register: case ARM_VST2d16: case ARM_VST2d32: case ARM_VST2d8: case ARM_VST2d16wb_fixed: case ARM_VST2d16wb_register: case ARM_VST2d32wb_fixed: case ARM_VST2d32wb_register: case ARM_VST2d8wb_fixed: case ARM_VST2d8wb_register: if (!Check(&S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; break; case ARM_VST2b16: case ARM_VST2b32: case ARM_VST2b8: case ARM_VST2b16wb_fixed: case ARM_VST2b16wb_register: case ARM_VST2b32wb_fixed: case ARM_VST2b32wb_register: case ARM_VST2b8wb_fixed: case ARM_VST2b8wb_register: if (!Check(&S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; break; default: if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; } // Second input register switch (MCInst_getOpcode(Inst)) { case ARM_VST3d8: case ARM_VST3d16: case ARM_VST3d32: case ARM_VST3d8_UPD: case ARM_VST3d16_UPD: case ARM_VST3d32_UPD: case ARM_VST4d8: case ARM_VST4d16: case ARM_VST4d32: case ARM_VST4d8_UPD: case ARM_VST4d16_UPD: case ARM_VST4d32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+1)%32, Address, Decoder))) return MCDisassembler_Fail; break; case ARM_VST3q8: case ARM_VST3q16: case ARM_VST3q32: case ARM_VST3q8_UPD: case ARM_VST3q16_UPD: case ARM_VST3q32_UPD: case ARM_VST4q8: case ARM_VST4q16: case ARM_VST4q32: case ARM_VST4q8_UPD: case ARM_VST4q16_UPD: case ARM_VST4q32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } // Third input register switch (MCInst_getOpcode(Inst)) { case ARM_VST3d8: case ARM_VST3d16: case ARM_VST3d32: case ARM_VST3d8_UPD: case ARM_VST3d16_UPD: case ARM_VST3d32_UPD: case ARM_VST4d8: case ARM_VST4d16: case ARM_VST4d32: case ARM_VST4d8_UPD: case ARM_VST4d16_UPD: case ARM_VST4d32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+2)%32, Address, Decoder))) return MCDisassembler_Fail; break; case ARM_VST3q8: case ARM_VST3q16: case ARM_VST3q32: case ARM_VST3q8_UPD: case ARM_VST3q16_UPD: case ARM_VST3q32_UPD: case ARM_VST4q8: case ARM_VST4q16: case ARM_VST4q32: case ARM_VST4q8_UPD: case ARM_VST4q16_UPD: case ARM_VST4q32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+4)%32, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } // Fourth input register switch (MCInst_getOpcode(Inst)) { case ARM_VST4d8: case ARM_VST4d16: case ARM_VST4d32: case ARM_VST4d8_UPD: case ARM_VST4d16_UPD: case ARM_VST4d32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+3)%32, Address, Decoder))) return MCDisassembler_Fail; break; case ARM_VST4q8: case ARM_VST4q16: case ARM_VST4q32: case ARM_VST4q8_UPD: case ARM_VST4q16_UPD: case ARM_VST4q32_UPD: if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+6)%32, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } return S; } static DecodeStatus DecodeVLD1DupInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn, Rm, align, size; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; Rn = fieldFromInstruction_4(Insn, 16, 4); Rm = fieldFromInstruction_4(Insn, 0, 4); align = fieldFromInstruction_4(Insn, 4, 1); size = fieldFromInstruction_4(Insn, 6, 2); if (size == 0 && align == 1) return MCDisassembler_Fail; align *= (1 << size); switch (MCInst_getOpcode(Inst)) { case ARM_VLD1DUPq16: case ARM_VLD1DUPq32: case ARM_VLD1DUPq8: case ARM_VLD1DUPq16wb_fixed: case ARM_VLD1DUPq16wb_register: case ARM_VLD1DUPq32wb_fixed: case ARM_VLD1DUPq32wb_register: case ARM_VLD1DUPq8wb_fixed: case ARM_VLD1DUPq8wb_register: if (!Check(&S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; break; default: if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; break; } if (Rm != 0xF) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, align); // The fixed offset post-increment encodes Rm == 0xd. The no-writeback // variant encodes Rm == 0xf. Anything else is a register offset post- // increment and we need to add the register operand to the instruction. if (Rm != 0xD && Rm != 0xF && !Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeVLD2DupInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn, Rm, align, size; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; Rn = fieldFromInstruction_4(Insn, 16, 4); Rm = fieldFromInstruction_4(Insn, 0, 4); align = fieldFromInstruction_4(Insn, 4, 1); size = 1 << fieldFromInstruction_4(Insn, 6, 2); align *= 2*size; switch (MCInst_getOpcode(Inst)) { case ARM_VLD2DUPd16: case ARM_VLD2DUPd32: case ARM_VLD2DUPd8: case ARM_VLD2DUPd16wb_fixed: case ARM_VLD2DUPd16wb_register: case ARM_VLD2DUPd32wb_fixed: case ARM_VLD2DUPd32wb_register: case ARM_VLD2DUPd8wb_fixed: case ARM_VLD2DUPd8wb_register: if (!Check(&S, DecodeDPairRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; break; case ARM_VLD2DUPd16x2: case ARM_VLD2DUPd32x2: case ARM_VLD2DUPd8x2: case ARM_VLD2DUPd16x2wb_fixed: case ARM_VLD2DUPd16x2wb_register: case ARM_VLD2DUPd32x2wb_fixed: case ARM_VLD2DUPd32x2wb_register: case ARM_VLD2DUPd8x2wb_fixed: case ARM_VLD2DUPd8x2wb_register: if (!Check(&S, DecodeDPairSpacedRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; break; default: if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; break; } if (Rm != 0xF) MCOperand_CreateImm0(Inst, 0); if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, align); if (Rm != 0xD && Rm != 0xF) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } return S; } static DecodeStatus DecodeVLD3DupInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn, Rm, inc; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; Rn = fieldFromInstruction_4(Insn, 16, 4); Rm = fieldFromInstruction_4(Insn, 0, 4); inc = fieldFromInstruction_4(Insn, 5, 1) + 1; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) return MCDisassembler_Fail; if (Rm != 0xF) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, 0); if (Rm == 0xD) MCOperand_CreateReg0(Inst, 0); else if (Rm != 0xF) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } return S; } static DecodeStatus DecodeVLD4DupInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn, Rm, size, inc, align; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; Rn = fieldFromInstruction_4(Insn, 16, 4); Rm = fieldFromInstruction_4(Insn, 0, 4); size = fieldFromInstruction_4(Insn, 6, 2); inc = fieldFromInstruction_4(Insn, 5, 1) + 1; align = fieldFromInstruction_4(Insn, 4, 1); if (size == 0x3) { if (align == 0) return MCDisassembler_Fail; align = 16; } else { if (size == 2) { align *= 8; } else { size = 1 << size; align *= 4 * size; } } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+inc)%32, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+2*inc)%32, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, (Rd+3*inc)%32, Address, Decoder))) return MCDisassembler_Fail; if (Rm != 0xF) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, align); if (Rm == 0xD) MCOperand_CreateReg0(Inst, 0); else if (Rm != 0xF) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } return S; } static DecodeStatus DecodeNEONModImmInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned imm, Q; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; imm = fieldFromInstruction_4(Insn, 0, 4); imm |= fieldFromInstruction_4(Insn, 16, 3) << 4; imm |= fieldFromInstruction_4(Insn, 24, 1) << 7; imm |= fieldFromInstruction_4(Insn, 8, 4) << 8; imm |= fieldFromInstruction_4(Insn, 5, 1) << 12; Q = fieldFromInstruction_4(Insn, 6, 1); if (Q) { if (!Check(&S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; } else { if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; } MCOperand_CreateImm0(Inst, imm); switch (MCInst_getOpcode(Inst)) { case ARM_VORRiv4i16: case ARM_VORRiv2i32: case ARM_VBICiv4i16: case ARM_VBICiv2i32: if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; break; case ARM_VORRiv8i16: case ARM_VORRiv4i32: case ARM_VBICiv8i16: case ARM_VBICiv4i32: if (!Check(&S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; break; default: break; } return S; } static DecodeStatus DecodeVSHLMaxInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rm, size; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; Rm = fieldFromInstruction_4(Insn, 0, 4); Rm |= fieldFromInstruction_4(Insn, 5, 1) << 4; size = fieldFromInstruction_4(Insn, 18, 2); if (!Check(&S, DecodeQPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, 8 << size); return S; } static DecodeStatus DecodeShiftRight8Imm(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { MCOperand_CreateImm0(Inst, 8 - Val); return MCDisassembler_Success; } static DecodeStatus DecodeShiftRight16Imm(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { MCOperand_CreateImm0(Inst, 16 - Val); return MCDisassembler_Success; } static DecodeStatus DecodeShiftRight32Imm(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { MCOperand_CreateImm0(Inst, 32 - Val); return MCDisassembler_Success; } static DecodeStatus DecodeShiftRight64Imm(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { MCOperand_CreateImm0(Inst, 64 - Val); return MCDisassembler_Success; } static DecodeStatus DecodeTBLInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn, Rm, op; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; Rn = fieldFromInstruction_4(Insn, 16, 4); Rn |= fieldFromInstruction_4(Insn, 7, 1) << 4; Rm = fieldFromInstruction_4(Insn, 0, 4); Rm |= fieldFromInstruction_4(Insn, 5, 1) << 4; op = fieldFromInstruction_4(Insn, 6, 1); if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (op) { if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; // Writeback } switch (MCInst_getOpcode(Inst)) { case ARM_VTBL2: case ARM_VTBX2: if (!Check(&S, DecodeDPairRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; break; default: if (!Check(&S, DecodeDPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeThumbAddSpecialReg(MCInst *Inst, uint16_t Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned dst = fieldFromInstruction_2(Insn, 8, 3); unsigned imm = fieldFromInstruction_2(Insn, 0, 8); if (!Check(&S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder))) return MCDisassembler_Fail; switch(MCInst_getOpcode(Inst)) { default: return MCDisassembler_Fail; case ARM_tADR: break; // tADR does not explicitly represent the PC as an operand. case ARM_tADDrSPi: MCOperand_CreateReg0(Inst, ARM_SP); break; } MCOperand_CreateImm0(Inst, imm); return S; } static DecodeStatus DecodeThumbBROperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { MCOperand_CreateImm0(Inst, SignExtend32(Val << 1, 12)); return MCDisassembler_Success; } static DecodeStatus DecodeT2BROperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { MCOperand_CreateImm0(Inst, SignExtend32(Val, 21)); return MCDisassembler_Success; } static DecodeStatus DecodeThumbCmpBROperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { MCOperand_CreateImm0(Inst, Val << 1); return MCDisassembler_Success; } static DecodeStatus DecodeThumbAddrModeRR(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Val, 0, 3); unsigned Rm = fieldFromInstruction_4(Val, 3, 3); if (!Check(&S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodetGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeThumbAddrModeIS(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Val, 0, 3); unsigned imm = fieldFromInstruction_4(Val, 3, 5); if (!Check(&S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, imm); return S; } static DecodeStatus DecodeThumbAddrModePC(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { unsigned imm = Val << 2; MCOperand_CreateImm0(Inst, imm); //tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder); return MCDisassembler_Success; } static DecodeStatus DecodeThumbAddrModeSP(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { MCOperand_CreateReg0(Inst, ARM_SP); MCOperand_CreateImm0(Inst, Val); return MCDisassembler_Success; } static DecodeStatus DecodeT2AddrModeSOReg(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Val, 6, 4); unsigned Rm = fieldFromInstruction_4(Val, 2, 4); unsigned imm = fieldFromInstruction_4(Val, 0, 2); // Thumb stores cannot use PC as dest register. switch (MCInst_getOpcode(Inst)) { case ARM_t2STRHs: case ARM_t2STRBs: case ARM_t2STRs: if (Rn == 15) return MCDisassembler_Fail; default: break; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, imm); return S; } static DecodeStatus DecodeT2LoadShift(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned addrmode; unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); if (Rn == 15) { switch (MCInst_getOpcode(Inst)) { case ARM_t2LDRBs: MCInst_setOpcode(Inst, ARM_t2LDRBpci); break; case ARM_t2LDRHs: MCInst_setOpcode(Inst, ARM_t2LDRHpci); break; case ARM_t2LDRSHs: MCInst_setOpcode(Inst, ARM_t2LDRSHpci); break; case ARM_t2LDRSBs: MCInst_setOpcode(Inst, ARM_t2LDRSBpci); break; case ARM_t2LDRs: MCInst_setOpcode(Inst, ARM_t2LDRpci); break; case ARM_t2PLDs: MCInst_setOpcode(Inst, ARM_t2PLDpci); break; case ARM_t2PLIs: MCInst_setOpcode(Inst, ARM_t2PLIpci); break; default: return MCDisassembler_Fail; } return DecodeT2LoadLabel(Inst, Insn, Address, Decoder); } if (Rt == 15) { switch (MCInst_getOpcode(Inst)) { case ARM_t2LDRSHs: return MCDisassembler_Fail; case ARM_t2LDRHs: // FIXME: this instruction is only available with MP extensions, // this should be checked first but we don't have access to the // feature bits here. MCInst_setOpcode(Inst, ARM_t2PLDWs); break; default: break; } } switch (MCInst_getOpcode(Inst)) { case ARM_t2PLDs: case ARM_t2PLDWs: case ARM_t2PLIs: break; default: if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; } addrmode = fieldFromInstruction_4(Insn, 4, 2); addrmode |= fieldFromInstruction_4(Insn, 0, 4) << 2; addrmode |= fieldFromInstruction_4(Insn, 16, 4) << 6; if (!Check(&S, DecodeT2AddrModeSOReg(Inst, addrmode, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeT2LoadImm8(MCInst *Inst, unsigned Insn, uint64_t Address, const void* Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned U = fieldFromInstruction_4(Insn, 9, 1); unsigned imm = fieldFromInstruction_4(Insn, 0, 8); imm |= (U << 8); imm |= (Rn << 9); if (Rn == 15) { switch (MCInst_getOpcode(Inst)) { case ARM_t2LDRi8: MCInst_setOpcode(Inst, ARM_t2LDRpci); break; case ARM_t2LDRBi8: MCInst_setOpcode(Inst, ARM_t2LDRBpci); break; case ARM_t2LDRSBi8: MCInst_setOpcode(Inst, ARM_t2LDRSBpci); break; case ARM_t2LDRHi8: MCInst_setOpcode(Inst, ARM_t2LDRHpci); break; case ARM_t2LDRSHi8: MCInst_setOpcode(Inst, ARM_t2LDRSHpci); break; case ARM_t2PLDi8: MCInst_setOpcode(Inst, ARM_t2PLDpci); break; case ARM_t2PLIi8: MCInst_setOpcode(Inst, ARM_t2PLIpci); break; default: return MCDisassembler_Fail; } return DecodeT2LoadLabel(Inst, Insn, Address, Decoder); } if (Rt == 15) { switch (MCInst_getOpcode(Inst)) { case ARM_t2LDRSHi8: return MCDisassembler_Fail; default: break; } } switch (MCInst_getOpcode(Inst)) { case ARM_t2PLDi8: case ARM_t2PLIi8: case ARM_t2PLDWi8: break; default: if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeT2LoadImm12(MCInst *Inst, unsigned Insn, uint64_t Address, const void* Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned imm = fieldFromInstruction_4(Insn, 0, 12); imm |= (Rn << 13); if (Rn == 15) { switch (MCInst_getOpcode(Inst)) { case ARM_t2LDRi12: MCInst_setOpcode(Inst, ARM_t2LDRpci); break; case ARM_t2LDRHi12: MCInst_setOpcode(Inst, ARM_t2LDRHpci); break; case ARM_t2LDRSHi12: MCInst_setOpcode(Inst, ARM_t2LDRSHpci); break; case ARM_t2LDRBi12: MCInst_setOpcode(Inst, ARM_t2LDRBpci); break; case ARM_t2LDRSBi12: MCInst_setOpcode(Inst, ARM_t2LDRSBpci); break; case ARM_t2PLDi12: MCInst_setOpcode(Inst, ARM_t2PLDpci); break; case ARM_t2PLIi12: MCInst_setOpcode(Inst, ARM_t2PLIpci); break; default: return MCDisassembler_Fail; } return DecodeT2LoadLabel(Inst, Insn, Address, Decoder); } if (Rt == 15) { switch (MCInst_getOpcode(Inst)) { case ARM_t2LDRSHi12: return MCDisassembler_Fail; case ARM_t2LDRHi12: MCInst_setOpcode(Inst, ARM_t2PLDi12); break; default: break; } } switch (MCInst_getOpcode(Inst)) { case ARM_t2PLDi12: case ARM_t2PLDWi12: case ARM_t2PLIi12: break; default: if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeT2AddrModeImm12(Inst, imm, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeT2LoadT(MCInst *Inst, unsigned Insn, uint64_t Address, const void* Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned imm = fieldFromInstruction_4(Insn, 0, 8); imm |= (Rn << 9); if (Rn == 15) { switch (MCInst_getOpcode(Inst)) { case ARM_t2LDRT: MCInst_setOpcode(Inst, ARM_t2LDRpci); break; case ARM_t2LDRBT: MCInst_setOpcode(Inst, ARM_t2LDRBpci); break; case ARM_t2LDRHT: MCInst_setOpcode(Inst, ARM_t2LDRHpci); break; case ARM_t2LDRSBT: MCInst_setOpcode(Inst, ARM_t2LDRSBpci); break; case ARM_t2LDRSHT: MCInst_setOpcode(Inst, ARM_t2LDRSHpci); break; default: return MCDisassembler_Fail; } return DecodeT2LoadLabel(Inst, Insn, Address, Decoder); } if (!Check(&S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeT2AddrModeImm8(Inst, imm, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeT2LoadLabel(MCInst *Inst, unsigned Insn, uint64_t Address, const void* Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned U = fieldFromInstruction_4(Insn, 23, 1); int imm = fieldFromInstruction_4(Insn, 0, 12); if (Rt == 15) { switch (MCInst_getOpcode(Inst)) { case ARM_t2LDRBpci: case ARM_t2LDRHpci: MCInst_setOpcode(Inst, ARM_t2PLDpci); break; case ARM_t2LDRSBpci: MCInst_setOpcode(Inst, ARM_t2PLIpci); break; case ARM_t2LDRSHpci: return MCDisassembler_Fail; default: break; } } switch(MCInst_getOpcode(Inst)) { case ARM_t2PLDpci: case ARM_t2PLIpci: break; default: if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; } if (!U) { // Special case for #-0. if (imm == 0) imm = INT32_MIN; else imm = -imm; } MCOperand_CreateImm0(Inst, imm); return S; } static DecodeStatus DecodeT2Imm8S4(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { if (Val == 0) MCOperand_CreateImm0(Inst, INT32_MIN); else { int imm = Val & 0xFF; if (!(Val & 0x100)) imm *= -1; MCOperand_CreateImm0(Inst, imm * 4); } return MCDisassembler_Success; } static DecodeStatus DecodeT2AddrModeImm8s4(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Val, 9, 4); unsigned imm = fieldFromInstruction_4(Val, 0, 9); if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeT2Imm8S4(Inst, imm, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeT2AddrModeImm0_1020s4(MCInst *Inst,unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Val, 8, 4); unsigned imm = fieldFromInstruction_4(Val, 0, 8); if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, imm); return S; } static DecodeStatus DecodeT2Imm8(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { int imm = Val & 0xFF; if (Val == 0) imm = INT32_MIN; else if (!(Val & 0x100)) imm *= -1; MCOperand_CreateImm0(Inst, imm); return MCDisassembler_Success; } static DecodeStatus DecodeT2AddrModeImm8(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Val, 9, 4); unsigned imm = fieldFromInstruction_4(Val, 0, 9); // Thumb stores cannot use PC as dest register. switch (MCInst_getOpcode(Inst)) { case ARM_t2STRT: case ARM_t2STRBT: case ARM_t2STRHT: case ARM_t2STRi8: case ARM_t2STRHi8: case ARM_t2STRBi8: if (Rn == 15) return MCDisassembler_Fail; break; default: break; } // Some instructions always use an additive offset. switch (MCInst_getOpcode(Inst)) { case ARM_t2LDRT: case ARM_t2LDRBT: case ARM_t2LDRHT: case ARM_t2LDRSBT: case ARM_t2LDRSHT: case ARM_t2STRT: case ARM_t2STRBT: case ARM_t2STRHT: imm |= 0x100; break; default: break; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeT2Imm8(Inst, imm, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeT2LdStPre(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned load; unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned addr = fieldFromInstruction_4(Insn, 0, 8); addr |= fieldFromInstruction_4(Insn, 9, 1) << 8; addr |= Rn << 9; load = fieldFromInstruction_4(Insn, 20, 1); if (Rn == 15) { switch (MCInst_getOpcode(Inst)) { case ARM_t2LDR_PRE: case ARM_t2LDR_POST: MCInst_setOpcode(Inst, ARM_t2LDRpci); break; case ARM_t2LDRB_PRE: case ARM_t2LDRB_POST: MCInst_setOpcode(Inst, ARM_t2LDRBpci); break; case ARM_t2LDRH_PRE: case ARM_t2LDRH_POST: MCInst_setOpcode(Inst, ARM_t2LDRHpci); break; case ARM_t2LDRSB_PRE: case ARM_t2LDRSB_POST: if (Rt == 15) MCInst_setOpcode(Inst, ARM_t2PLIpci); else MCInst_setOpcode(Inst, ARM_t2LDRSBpci); break; case ARM_t2LDRSH_PRE: case ARM_t2LDRSH_POST: MCInst_setOpcode(Inst, ARM_t2LDRSHpci); break; default: return MCDisassembler_Fail; } return DecodeT2LoadLabel(Inst, Insn, Address, Decoder); } if (!load) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; if (load) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeT2AddrModeImm8(Inst, addr, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeT2AddrModeImm12(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Val, 13, 4); unsigned imm = fieldFromInstruction_4(Val, 0, 12); // Thumb stores cannot use PC as dest register. switch (MCInst_getOpcode(Inst)) { case ARM_t2STRi12: case ARM_t2STRBi12: case ARM_t2STRHi12: if (Rn == 15) return MCDisassembler_Fail; default: break; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, imm); return S; } static DecodeStatus DecodeThumbAddSPImm(MCInst *Inst, uint16_t Insn, uint64_t Address, const void *Decoder) { unsigned imm = fieldFromInstruction_2(Insn, 0, 7); MCOperand_CreateReg0(Inst, ARM_SP); MCOperand_CreateReg0(Inst, ARM_SP); MCOperand_CreateImm0(Inst, imm); return MCDisassembler_Success; } static DecodeStatus DecodeThumbAddSPReg(MCInst *Inst, uint16_t Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; if (MCInst_getOpcode(Inst) == ARM_tADDrSP) { unsigned Rdm = fieldFromInstruction_2(Insn, 0, 3); Rdm |= fieldFromInstruction_2(Insn, 7, 1) << 3; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateReg0(Inst, ARM_SP); if (!Check(&S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder))) return MCDisassembler_Fail; } else if (MCInst_getOpcode(Inst) == ARM_tADDspr) { unsigned Rm = fieldFromInstruction_2(Insn, 3, 4); MCOperand_CreateReg0(Inst, ARM_SP); MCOperand_CreateReg0(Inst, ARM_SP); if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } return S; } static DecodeStatus DecodeThumbCPS(MCInst *Inst, uint16_t Insn, uint64_t Address, const void *Decoder) { unsigned imod = fieldFromInstruction_2(Insn, 4, 1) | 0x2; unsigned flags = fieldFromInstruction_2(Insn, 0, 3); MCOperand_CreateImm0(Inst, imod); MCOperand_CreateImm0(Inst, flags); return MCDisassembler_Success; } static DecodeStatus DecodePostIdxReg(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned add = fieldFromInstruction_4(Insn, 4, 1); if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, add); return S; } static DecodeStatus DecodeThumbBLXOffset(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { // Val is passed in as S:J1:J2:imm10H:imm10L:'0' // Note only one trailing zero not two. Also the J1 and J2 values are from // the encoded instruction. So here change to I1 and I2 values via: // I1 = NOT(J1 EOR S); // I2 = NOT(J2 EOR S); // and build the imm32 with two trailing zeros as documented: // imm32 = SignExtend(S:I1:I2:imm10H:imm10L:'00', 32); unsigned S = (Val >> 23) & 1; unsigned J1 = (Val >> 22) & 1; unsigned J2 = (Val >> 21) & 1; unsigned I1 = !(J1 ^ S); unsigned I2 = !(J2 ^ S); unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21); int imm32 = SignExtend32(tmp << 1, 25); MCOperand_CreateImm0(Inst, imm32); return MCDisassembler_Success; } static DecodeStatus DecodeCoprocessor(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { if (Val == 0xA || Val == 0xB) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, Val); return MCDisassembler_Success; } static DecodeStatus DecodeThumbTableBranch(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); if (Rn == ARM_SP) S = MCDisassembler_SoftFail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecoderGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeThumb2BCCInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned brtarget; unsigned pred = fieldFromInstruction_4(Insn, 22, 4); if (pred == 0xE || pred == 0xF) { unsigned imm; unsigned opc = fieldFromInstruction_4(Insn, 4, 28); switch (opc) { default: return MCDisassembler_Fail; case 0xf3bf8f4: MCInst_setOpcode(Inst, ARM_t2DSB); break; case 0xf3bf8f5: MCInst_setOpcode(Inst, ARM_t2DMB); break; case 0xf3bf8f6: MCInst_setOpcode(Inst, ARM_t2ISB); break; } imm = fieldFromInstruction_4(Insn, 0, 4); return DecodeMemBarrierOption(Inst, imm, Address, Decoder); } brtarget = fieldFromInstruction_4(Insn, 0, 11) << 1; brtarget |= fieldFromInstruction_4(Insn, 11, 1) << 19; brtarget |= fieldFromInstruction_4(Insn, 13, 1) << 18; brtarget |= fieldFromInstruction_4(Insn, 16, 6) << 12; brtarget |= fieldFromInstruction_4(Insn, 26, 1) << 20; if (!Check(&S, DecodeT2BROperand(Inst, brtarget, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } // Decode a shifted immediate operand. These basically consist // of an 8-bit value, and a 4-bit directive that specifies either // a splat operation or a rotation. static DecodeStatus DecodeT2SOImm(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { unsigned ctrl = fieldFromInstruction_4(Val, 10, 2); if (ctrl == 0) { unsigned byte = fieldFromInstruction_4(Val, 8, 2); unsigned imm = fieldFromInstruction_4(Val, 0, 8); switch (byte) { case 0: MCOperand_CreateImm0(Inst, imm); break; case 1: MCOperand_CreateImm0(Inst, (imm << 16) | imm); break; case 2: MCOperand_CreateImm0(Inst, (imm << 24) | (imm << 8)); break; case 3: MCOperand_CreateImm0(Inst, (imm << 24) | (imm << 16) | (imm << 8) | imm); break; } } else { unsigned unrot = fieldFromInstruction_4(Val, 0, 7) | 0x80; unsigned rot = fieldFromInstruction_4(Val, 7, 5); unsigned imm = (unrot >> rot) | (unrot << ((32-rot)&31)); MCOperand_CreateImm0(Inst, imm); } return MCDisassembler_Success; } static DecodeStatus DecodeThumbBCCTargetOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { MCOperand_CreateImm0(Inst, SignExtend32(Val << 1, 9)); return MCDisassembler_Success; } static DecodeStatus DecodeThumbBLTargetOperand(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { // Val is passed in as S:J1:J2:imm10:imm11 // Note no trailing zero after imm11. Also the J1 and J2 values are from // the encoded instruction. So here change to I1 and I2 values via: // I1 = NOT(J1 EOR S); // I2 = NOT(J2 EOR S); // and build the imm32 with one trailing zero as documented: // imm32 = SignExtend(S:I1:I2:imm10:imm11:'0', 32); unsigned S = (Val >> 23) & 1; unsigned J1 = (Val >> 22) & 1; unsigned J2 = (Val >> 21) & 1; unsigned I1 = !(J1 ^ S); unsigned I2 = !(J2 ^ S); unsigned tmp = (Val & ~0x600000) | (I1 << 22) | (I2 << 21); int imm32 = SignExtend32(tmp << 1, 25); MCOperand_CreateImm0(Inst, imm32); return MCDisassembler_Success; } static DecodeStatus DecodeMemBarrierOption(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { if (Val & ~0xf) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, Val); return MCDisassembler_Success; } static DecodeStatus DecodeInstSyncBarrierOption(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { if (Val & ~0xf) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, Val); return MCDisassembler_Success; } static DecodeStatus DecodeMSRMask(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { if (!Val) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, Val); return MCDisassembler_Success; } static DecodeStatus DecodeDoubleRegLoad(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned pred = fieldFromInstruction_4(Insn, 28, 4); if (Rn == 0xF) S = MCDisassembler_SoftFail; if (!Check(&S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeDoubleRegStore(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); unsigned Rt = fieldFromInstruction_4(Insn, 0, 4); unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned pred = fieldFromInstruction_4(Insn, 28, 4); if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (Rn == 0xF || Rd == Rn || Rd == Rt || Rd == Rt+1) S = MCDisassembler_SoftFail; if (!Check(&S, DecodeGPRPairRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeLDRPreImm(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned pred; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned imm = fieldFromInstruction_4(Insn, 0, 12); imm |= fieldFromInstruction_4(Insn, 16, 4) << 13; imm |= fieldFromInstruction_4(Insn, 23, 1) << 12; pred = fieldFromInstruction_4(Insn, 28, 4); if (Rn == 0xF || Rn == Rt) S = MCDisassembler_SoftFail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeLDRPreReg(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned pred, Rm; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned imm = fieldFromInstruction_4(Insn, 0, 12); imm |= fieldFromInstruction_4(Insn, 16, 4) << 13; imm |= fieldFromInstruction_4(Insn, 23, 1) << 12; pred = fieldFromInstruction_4(Insn, 28, 4); Rm = fieldFromInstruction_4(Insn, 0, 4); if (Rn == 0xF || Rn == Rt) S = MCDisassembler_SoftFail; if (Rm == 0xF) S = MCDisassembler_SoftFail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeSTRPreImm(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned pred; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned imm = fieldFromInstruction_4(Insn, 0, 12); imm |= fieldFromInstruction_4(Insn, 16, 4) << 13; imm |= fieldFromInstruction_4(Insn, 23, 1) << 12; pred = fieldFromInstruction_4(Insn, 28, 4); if (Rn == 0xF || Rn == Rt) S = MCDisassembler_SoftFail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeAddrModeImm12Operand(Inst, imm, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeSTRPreReg(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned pred; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned imm = fieldFromInstruction_4(Insn, 0, 12); imm |= fieldFromInstruction_4(Insn, 16, 4) << 13; imm |= fieldFromInstruction_4(Insn, 23, 1) << 12; pred = fieldFromInstruction_4(Insn, 28, 4); if (Rn == 0xF || Rn == Rt) S = MCDisassembler_SoftFail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeSORegMemOperand(Inst, imm, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeVLD1LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned size, align = 0, index = 0; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; size = fieldFromInstruction_4(Insn, 10, 2); switch (size) { default: return MCDisassembler_Fail; case 0: if (fieldFromInstruction_4(Insn, 4, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 5, 3); break; case 1: if (fieldFromInstruction_4(Insn, 5, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 6, 2); if (fieldFromInstruction_4(Insn, 4, 1)) align = 2; break; case 2: if (fieldFromInstruction_4(Insn, 6, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 7, 1); switch (fieldFromInstruction_4(Insn, 4, 2)) { case 0 : align = 0; break; case 3: align = 4; break; default: return MCDisassembler_Fail; } break; } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (Rm != 0xF) { // Writeback if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, align); if (Rm != 0xF) { if (Rm != 0xD) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } else MCOperand_CreateReg0(Inst, 0); } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, index); return S; } static DecodeStatus DecodeVST1LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned size, align = 0, index = 0; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; size = fieldFromInstruction_4(Insn, 10, 2); switch (size) { default: return MCDisassembler_Fail; case 0: if (fieldFromInstruction_4(Insn, 4, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 5, 3); break; case 1: if (fieldFromInstruction_4(Insn, 5, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 6, 2); if (fieldFromInstruction_4(Insn, 4, 1)) align = 2; break; case 2: if (fieldFromInstruction_4(Insn, 6, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 7, 1); switch (fieldFromInstruction_4(Insn, 4, 2)) { case 0: align = 0; break; case 3: align = 4; break; default: return MCDisassembler_Fail; } break; } if (Rm != 0xF) { // Writeback if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, align); if (Rm != 0xF) { if (Rm != 0xD) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } else MCOperand_CreateReg0(Inst, 0); } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, index); return S; } static DecodeStatus DecodeVLD2LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned size, align = 0, index = 0, inc = 1; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; size = fieldFromInstruction_4(Insn, 10, 2); switch (size) { default: return MCDisassembler_Fail; case 0: index = fieldFromInstruction_4(Insn, 5, 3); if (fieldFromInstruction_4(Insn, 4, 1)) align = 2; break; case 1: index = fieldFromInstruction_4(Insn, 6, 2); if (fieldFromInstruction_4(Insn, 4, 1)) align = 4; if (fieldFromInstruction_4(Insn, 5, 1)) inc = 2; break; case 2: if (fieldFromInstruction_4(Insn, 5, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 7, 1); if (fieldFromInstruction_4(Insn, 4, 1) != 0) align = 8; if (fieldFromInstruction_4(Insn, 6, 1)) inc = 2; break; } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) return MCDisassembler_Fail; if (Rm != 0xF) { // Writeback if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, align); if (Rm != 0xF) { if (Rm != 0xD) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } else MCOperand_CreateReg0(Inst, 0); } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, index); return S; } static DecodeStatus DecodeVST2LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned size, align = 0, index = 0, inc = 1; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; size = fieldFromInstruction_4(Insn, 10, 2); switch (size) { default: return MCDisassembler_Fail; case 0: index = fieldFromInstruction_4(Insn, 5, 3); if (fieldFromInstruction_4(Insn, 4, 1)) align = 2; break; case 1: index = fieldFromInstruction_4(Insn, 6, 2); if (fieldFromInstruction_4(Insn, 4, 1)) align = 4; if (fieldFromInstruction_4(Insn, 5, 1)) inc = 2; break; case 2: if (fieldFromInstruction_4(Insn, 5, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 7, 1); if (fieldFromInstruction_4(Insn, 4, 1) != 0) align = 8; if (fieldFromInstruction_4(Insn, 6, 1)) inc = 2; break; } if (Rm != 0xF) { // Writeback if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, align); if (Rm != 0xF) { if (Rm != 0xD) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } else MCOperand_CreateReg0(Inst, 0); } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, index); return S; } static DecodeStatus DecodeVLD3LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned size, align = 0, index = 0, inc = 1; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; size = fieldFromInstruction_4(Insn, 10, 2); switch (size) { default: return MCDisassembler_Fail; case 0: if (fieldFromInstruction_4(Insn, 4, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 5, 3); break; case 1: if (fieldFromInstruction_4(Insn, 4, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 6, 2); if (fieldFromInstruction_4(Insn, 5, 1)) inc = 2; break; case 2: if (fieldFromInstruction_4(Insn, 4, 2)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 7, 1); if (fieldFromInstruction_4(Insn, 6, 1)) inc = 2; break; } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) return MCDisassembler_Fail; if (Rm != 0xF) { // Writeback if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, align); if (Rm != 0xF) { if (Rm != 0xD) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } else MCOperand_CreateReg0(Inst, 0); } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, index); return S; } static DecodeStatus DecodeVST3LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned size, align = 0, index = 0, inc = 1; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; size = fieldFromInstruction_4(Insn, 10, 2); switch (size) { default: return MCDisassembler_Fail; case 0: if (fieldFromInstruction_4(Insn, 4, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 5, 3); break; case 1: if (fieldFromInstruction_4(Insn, 4, 1)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 6, 2); if (fieldFromInstruction_4(Insn, 5, 1)) inc = 2; break; case 2: if (fieldFromInstruction_4(Insn, 4, 2)) return MCDisassembler_Fail; // UNDEFINED index = fieldFromInstruction_4(Insn, 7, 1); if (fieldFromInstruction_4(Insn, 6, 1)) inc = 2; break; } if (Rm != 0xF) { // Writeback if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, align); if (Rm != 0xF) { if (Rm != 0xD) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } else MCOperand_CreateReg0(Inst, 0); } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, index); return S; } static DecodeStatus DecodeVLD4LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned size, align = 0, index = 0, inc = 1; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; size = fieldFromInstruction_4(Insn, 10, 2); switch (size) { default: return MCDisassembler_Fail; case 0: if (fieldFromInstruction_4(Insn, 4, 1)) align = 4; index = fieldFromInstruction_4(Insn, 5, 3); break; case 1: if (fieldFromInstruction_4(Insn, 4, 1)) align = 8; index = fieldFromInstruction_4(Insn, 6, 2); if (fieldFromInstruction_4(Insn, 5, 1)) inc = 2; break; case 2: switch (fieldFromInstruction_4(Insn, 4, 2)) { case 0: align = 0; break; case 3: return MCDisassembler_Fail; default: align = 4 << fieldFromInstruction_4(Insn, 4, 2); break; } index = fieldFromInstruction_4(Insn, 7, 1); if (fieldFromInstruction_4(Insn, 6, 1)) inc = 2; break; } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) return MCDisassembler_Fail; if (Rm != 0xF) { // Writeback if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, align); if (Rm != 0xF) { if (Rm != 0xD) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } else MCOperand_CreateReg0(Inst, 0); } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, index); return S; } static DecodeStatus DecodeVST4LN(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned size, align = 0, index = 0, inc = 1; unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 0, 4); unsigned Rd = fieldFromInstruction_4(Insn, 12, 4); Rd |= fieldFromInstruction_4(Insn, 22, 1) << 4; size = fieldFromInstruction_4(Insn, 10, 2); switch (size) { default: return MCDisassembler_Fail; case 0: if (fieldFromInstruction_4(Insn, 4, 1)) align = 4; index = fieldFromInstruction_4(Insn, 5, 3); break; case 1: if (fieldFromInstruction_4(Insn, 4, 1)) align = 8; index = fieldFromInstruction_4(Insn, 6, 2); if (fieldFromInstruction_4(Insn, 5, 1)) inc = 2; break; case 2: switch (fieldFromInstruction_4(Insn, 4, 2)) { case 0: align = 0; break; case 3: return MCDisassembler_Fail; default: align = 4 << fieldFromInstruction_4(Insn, 4, 2); break; } index = fieldFromInstruction_4(Insn, 7, 1); if (fieldFromInstruction_4(Insn, 6, 1)) inc = 2; break; } if (Rm != 0xF) { // Writeback if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; } if (!Check(&S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, align); if (Rm != 0xF) { if (Rm != 0xD) { if (!Check(&S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; } else MCOperand_CreateReg0(Inst, 0); } if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+2*inc, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Rd+3*inc, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, index); return S; } static DecodeStatus DecodeVMOVSRR(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned Rt2 = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 5, 1); unsigned pred = fieldFromInstruction_4(Insn, 28, 4); Rm |= fieldFromInstruction_4(Insn, 0, 4) << 1; if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) S = MCDisassembler_SoftFail; if (!Check(&S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeVMOVRRS(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned Rt2 = fieldFromInstruction_4(Insn, 16, 4); unsigned Rm = fieldFromInstruction_4(Insn, 5, 1); unsigned pred = fieldFromInstruction_4(Insn, 28, 4); Rm |= fieldFromInstruction_4(Insn, 0, 4) << 1; if (Rt == 0xF || Rt2 == 0xF || Rm == 0x1F) S = MCDisassembler_SoftFail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt , Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRRegisterClass(Inst, Rt2 , Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeSPRRegisterClass(Inst, Rm , Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeSPRRegisterClass(Inst, Rm+1, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeIT(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned pred = fieldFromInstruction_4(Insn, 4, 4); unsigned mask = fieldFromInstruction_4(Insn, 0, 4); if (pred == 0xF) { pred = 0xE; S = MCDisassembler_SoftFail; } if (mask == 0x0) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, pred); MCOperand_CreateImm0(Inst, mask); return S; } static DecodeStatus DecodeT2LDRDPreInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned Rt2 = fieldFromInstruction_4(Insn, 8, 4); unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned addr = fieldFromInstruction_4(Insn, 0, 8); unsigned W = fieldFromInstruction_4(Insn, 21, 1); unsigned U = fieldFromInstruction_4(Insn, 23, 1); unsigned P = fieldFromInstruction_4(Insn, 24, 1); bool writeback = (W == 1) | (P == 0); addr |= (U << 8) | (Rn << 9); if (writeback && (Rn == Rt || Rn == Rt2)) Check(&S, MCDisassembler_SoftFail); if (Rt == Rt2) Check(&S, MCDisassembler_SoftFail); // Rt if (!Check(&S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; // Rt2 if (!Check(&S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) return MCDisassembler_Fail; // Writeback operand if (!Check(&S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; // addr if (!Check(&S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeT2STRDPreInstruction(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned Rt2 = fieldFromInstruction_4(Insn, 8, 4); unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned addr = fieldFromInstruction_4(Insn, 0, 8); unsigned W = fieldFromInstruction_4(Insn, 21, 1); unsigned U = fieldFromInstruction_4(Insn, 23, 1); unsigned P = fieldFromInstruction_4(Insn, 24, 1); bool writeback = (W == 1) | (P == 0); addr |= (U << 8) | (Rn << 9); if (writeback && (Rn == Rt || Rn == Rt2)) Check(&S, MCDisassembler_SoftFail); // Writeback operand if (!Check(&S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; // Rt if (!Check(&S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; // Rt2 if (!Check(&S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder))) return MCDisassembler_Fail; // addr if (!Check(&S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeT2Adr(MCInst *Inst, uint32_t Insn, uint64_t Address, const void *Decoder) { unsigned Val; unsigned sign1 = fieldFromInstruction_4(Insn, 21, 1); unsigned sign2 = fieldFromInstruction_4(Insn, 23, 1); if (sign1 != sign2) return MCDisassembler_Fail; Val = fieldFromInstruction_4(Insn, 0, 8); Val |= fieldFromInstruction_4(Insn, 12, 3) << 8; Val |= fieldFromInstruction_4(Insn, 26, 1) << 11; Val |= sign1 << 12; MCOperand_CreateImm0(Inst, SignExtend32(Val, 13)); return MCDisassembler_Success; } static DecodeStatus DecodeT2ShifterImmOperand(MCInst *Inst, uint32_t Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; // Shift of "asr #32" is not allowed in Thumb2 mode. if (Val == 0x20) S = MCDisassembler_SoftFail; MCOperand_CreateImm0(Inst, Val); return S; } static DecodeStatus DecodeSwap(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S; unsigned Rt = fieldFromInstruction_4(Insn, 12, 4); unsigned Rt2 = fieldFromInstruction_4(Insn, 0, 4); unsigned Rn = fieldFromInstruction_4(Insn, 16, 4); unsigned pred = fieldFromInstruction_4(Insn, 28, 4); if (pred == 0xF) return DecodeCPSInstruction(Inst, Insn, Address, Decoder); S = MCDisassembler_Success; if (Rt == Rn || Rn == Rt2) S = MCDisassembler_SoftFail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, pred, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeVCVTD(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Vm, imm, cmode, op; unsigned Vd = (fieldFromInstruction_4(Insn, 12, 4) << 0); Vd |= (fieldFromInstruction_4(Insn, 22, 1) << 4); Vm = (fieldFromInstruction_4(Insn, 0, 4) << 0); Vm |= (fieldFromInstruction_4(Insn, 5, 1) << 4); imm = fieldFromInstruction_4(Insn, 16, 6); cmode = fieldFromInstruction_4(Insn, 8, 4); op = fieldFromInstruction_4(Insn, 5, 1); // VMOVv2f32 is ambiguous with these decodings. if (!(imm & 0x38) && cmode == 0xF) { if (op == 1) return MCDisassembler_Fail; MCInst_setOpcode(Inst, ARM_VMOVv2f32); return DecodeNEONModImmInstruction(Inst, Insn, Address, Decoder); } if (!(imm & 0x20)) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeDPRRegisterClass(Inst, Vm, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, 64 - imm); return S; } static DecodeStatus DecodeVCVTQ(MCInst *Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Vm, imm, cmode, op; unsigned Vd = (fieldFromInstruction_4(Insn, 12, 4) << 0); Vd |= (fieldFromInstruction_4(Insn, 22, 1) << 4); Vm = (fieldFromInstruction_4(Insn, 0, 4) << 0); Vm |= (fieldFromInstruction_4(Insn, 5, 1) << 4); imm = fieldFromInstruction_4(Insn, 16, 6); cmode = fieldFromInstruction_4(Insn, 8, 4); op = fieldFromInstruction_4(Insn, 5, 1); // VMOVv4f32 is ambiguous with these decodings. if (!(imm & 0x38) && cmode == 0xF) { if (op == 1) return MCDisassembler_Fail; MCInst_setOpcode(Inst, ARM_VMOVv4f32); return DecodeNEONModImmInstruction(Inst, Insn, Address, Decoder); } if (!(imm & 0x20)) return MCDisassembler_Fail; if (!Check(&S, DecodeQPRRegisterClass(Inst, Vd, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeQPRRegisterClass(Inst, Vm, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, 64 - imm); return S; } static DecodeStatus DecodeLDR(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned Cond; unsigned Rn = fieldFromInstruction_4(Val, 16, 4); unsigned Rt = fieldFromInstruction_4(Val, 12, 4); unsigned Rm = fieldFromInstruction_4(Val, 0, 4); Rm |= (fieldFromInstruction_4(Val, 23, 1) << 4); Cond = fieldFromInstruction_4(Val, 28, 4); if (fieldFromInstruction_4(Val, 8, 4) != 0 || Rn == Rt) S = MCDisassembler_SoftFail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeAddrMode7Operand(Inst, Rn, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePostIdxReg(Inst, Rm, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodePredicateOperand(Inst, Cond, Address, Decoder))) return MCDisassembler_Fail; return S; } static DecodeStatus DecodeMRRC2(MCInst *Inst, unsigned Val, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler_Success; unsigned CRm = fieldFromInstruction_4(Val, 0, 4); unsigned opc1 = fieldFromInstruction_4(Val, 4, 4); unsigned cop = fieldFromInstruction_4(Val, 8, 4); unsigned Rt = fieldFromInstruction_4(Val, 12, 4); unsigned Rt2 = fieldFromInstruction_4(Val, 16, 4); if ((cop & ~0x1) == 0xa) return MCDisassembler_Fail; if (Rt == Rt2) S = MCDisassembler_SoftFail; MCOperand_CreateImm0(Inst, cop); MCOperand_CreateImm0(Inst, opc1); if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder))) return MCDisassembler_Fail; if (!Check(&S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder))) return MCDisassembler_Fail; MCOperand_CreateImm0(Inst, CRm); return S; } #endif