//===- MipsDisassembler.cpp - Disassembler for Mips -------------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file is part of the Mips Disassembler. // //===----------------------------------------------------------------------===// /* Capstone Disassembly Engine */ /* By Nguyen Anh Quynh , 2013-2014 */ #ifdef CAPSTONE_HAS_MIPS #include #include #include "../../inttypes.h" #include "../../utils.h" #include "../../MCInst.h" #include "../../MCRegisterInfo.h" #include "../../SStream.h" #include "../../MathExtras.h" //#include "Mips.h" //#include "MipsRegisterInfo.h" //#include "MipsSubtarget.h" #include "../../MCFixedLenDisassembler.h" #include "../../MCInst.h" //#include "llvm/MC/MCSubtargetInfo.h" #include "../../MCRegisterInfo.h" #include "../../MCDisassembler.h" // Forward declare these because the autogenerated code will reference them. // Definitions are further down. static DecodeStatus DecodeGPR64RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeCPU16RegsRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeGPR32RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodePtrRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeDSPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeFGR64RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeFGR32RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeCCRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeFCCRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeCCRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeFGRCCRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeHWRegsRegisterClass(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeAFGR64RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeACC64DSPRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeHI32DSPRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeLO32DSPRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeMSA128BRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeMSA128HRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeMSA128WRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeMSA128DRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeMSACtrlRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeCOP2RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeBranchTarget(MCInst *Inst, unsigned Offset, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeJumpTarget(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeBranchTarget21(MCInst *Inst, unsigned Offset, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeBranchTarget26(MCInst *Inst, unsigned Offset, uint64_t Address, MCRegisterInfo *Decoder); // DecodeBranchTargetMM - Decode microMIPS branch offset, which is // shifted left by 1 bit. static DecodeStatus DecodeBranchTargetMM(MCInst *Inst, unsigned Offset, uint64_t Address, MCRegisterInfo *Decoder); // DecodeJumpTargetMM - Decode microMIPS jump target, which is // shifted left by 1 bit. static DecodeStatus DecodeJumpTargetMM(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeMem(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeCachePref(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeMSA128Mem(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeMemMMImm12(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeMemMMImm16(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeFMem(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeCOP2Mem(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeCOP3Mem(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeSpecial3LlSc(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeSimm16(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); // Decode the immediate field of an LSA instruction which // is off by one. static DecodeStatus DecodeLSAImm(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeInsSize(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeExtSize(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeSimm19Lsl2(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeSimm18Lsl3(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder); /// INSVE_[BHWD] have an implicit operand that the generated decoder doesn't /// handle. static DecodeStatus DecodeINSVE_DF_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeAddiGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeDaddiGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeBlezlGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeBgtzlGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeBgtzGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder); static DecodeStatus DecodeBlezGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder); #define GET_SUBTARGETINFO_ENUM #include "MipsGenSubtargetInfo.inc" // Hacky: enable all features for disassembler static uint64_t getFeatureBits(int mode) { uint64_t Bits = (uint64_t)-1; // include every features by default // ref: MipsGenDisassemblerTables.inc::checkDecoderPredicate() // some features are mutually execlusive if (mode & CS_MODE_16) { //Bits &= ~Mips_FeatureMips32r2; //Bits &= ~Mips_FeatureMips32; //Bits &= ~Mips_FeatureFPIdx; //Bits &= ~Mips_FeatureBitCount; //Bits &= ~Mips_FeatureSwap; //Bits &= ~Mips_FeatureSEInReg; //Bits &= ~Mips_FeatureMips64r2; //Bits &= ~Mips_FeatureFP64Bit; } else if (mode & CS_MODE_32) { Bits &= ~Mips_FeatureMips16; Bits &= ~Mips_FeatureFP64Bit; Bits &= ~Mips_FeatureMips32r6; Bits &= ~Mips_FeatureMips64r6; } else if (mode & CS_MODE_64) { Bits &= ~Mips_FeatureMips16; Bits &= ~Mips_FeatureMips64r6; Bits &= ~Mips_FeatureMips64r6; } if (mode & CS_MODE_MICRO) { Bits |= Mips_FeatureMicroMips; Bits &= ~Mips_FeatureMips4_32r2; Bits &= ~Mips_FeatureMips2; } else { Bits &= ~Mips_FeatureMicroMips; } return Bits; } #include "MipsGenDisassemblerTables.inc" #define GET_REGINFO_ENUM #include "MipsGenRegisterInfo.inc" #define GET_REGINFO_MC_DESC #include "MipsGenRegisterInfo.inc" #define GET_INSTRINFO_ENUM #include "MipsGenInstrInfo.inc" void Mips_init(MCRegisterInfo *MRI) { // InitMCRegisterInfo(MipsRegDesc, 394, RA, PC, // MipsMCRegisterClasses, 48, // MipsRegUnitRoots, // 273, // MipsRegDiffLists, // MipsRegStrings, // MipsSubRegIdxLists, // 12, // MipsSubRegIdxRanges, // MipsRegEncodingTable); MCRegisterInfo_InitMCRegisterInfo(MRI, MipsRegDesc, 394, 0, 0, MipsMCRegisterClasses, 48, 0, 0, MipsRegDiffLists, 0, MipsSubRegIdxLists, 12, 0); } /// readInstruction - read four bytes from the MemoryObject /// and return 32 bit word sorted according to the given endianess static DecodeStatus readInstruction32(unsigned char *code, uint32_t *insn, bool isBigEndian, bool isMicroMips) { // We want to read exactly 4 Bytes of data. if (isBigEndian) { // Encoded as a big-endian 32-bit word in the stream. *insn = (code[3] << 0) | (code[2] << 8) | (code[1] << 16) | (code[0] << 24); } else { // Encoded as a small-endian 32-bit word in the stream. // Little-endian byte ordering: // mips32r2: 4 | 3 | 2 | 1 // microMIPS: 2 | 1 | 4 | 3 if (isMicroMips) { *insn = (code[2] << 0) | (code[3] << 8) | (code[0] << 16) | (code[1] << 24); } else { *insn = (code[0] << 0) | (code[1] << 8) | (code[2] << 16) | (code[3] << 24); } } return MCDisassembler_Success; } static DecodeStatus MipsDisassembler_getInstruction(int mode, MCInst *instr, const uint8_t *code, size_t code_len, uint16_t *Size, uint64_t Address, bool isBigEndian, MCRegisterInfo *MRI) { uint32_t Insn; DecodeStatus Result; if (code_len < 4) // not enough data return MCDisassembler_Fail; if (instr->flat_insn->detail) { memset(instr->flat_insn->detail, 0, sizeof(cs_detail)); } Result = readInstruction32((unsigned char*)code, &Insn, isBigEndian, mode & CS_MODE_MICRO); if (Result == MCDisassembler_Fail) return MCDisassembler_Fail; if (mode & CS_MODE_MICRO) { // Calling the auto-generated decoder function. Result = decodeInstruction(DecoderTableMicroMips32, instr, Insn, Address, MRI, mode); if (Result != MCDisassembler_Fail) { *Size = 4; return Result; } return MCDisassembler_Fail; } if (((mode & CS_MODE_32) == 0) && ((mode & CS_MODE_MIPS3) == 0)) { // COP3 // DEBUG(dbgs() << "Trying COP3_ table (32-bit opcodes):\n"); Result = decodeInstruction(DecoderTableCOP3_32, instr, Insn, Address, MRI, mode); if (Result != MCDisassembler_Fail) { *Size = 4; return Result; } } if (((mode & CS_MODE_MIPS32R6) != 0) && ((mode & CS_MODE_MIPSGP64) != 0)) { // DEBUG(dbgs() << "Trying Mips32r6_64r6 (GPR64) table (32-bit opcodes):\n"); Result = decodeInstruction(DecoderTableMips32r6_64r6_GP6432, instr, Insn, Address, MRI, mode); if (Result != MCDisassembler_Fail) { *Size = 4; return Result; } } if ((mode & CS_MODE_MIPS32R6) != 0) { // DEBUG(dbgs() << "Trying Mips32r6_64r6 table (32-bit opcodes):\n"); Result = decodeInstruction(DecoderTableMips32r6_64r632, instr, Insn, Address, MRI, mode); if (Result != MCDisassembler_Fail) { *Size = 4; return Result; } } // Calling the auto-generated decoder function. Result = decodeInstruction(DecoderTableMips32, instr, Insn, Address, MRI, mode); if (Result != MCDisassembler_Fail) { *Size = 4; return Result; } return MCDisassembler_Fail; } bool Mips_getInstruction(csh ud, const uint8_t *code, size_t code_len, MCInst *instr, uint16_t *size, uint64_t address, void *info) { cs_struct *handle = (cs_struct *)(uintptr_t)ud; DecodeStatus status = MipsDisassembler_getInstruction(handle->mode, instr, code, code_len, size, address, handle->big_endian, (MCRegisterInfo *)info); return status == MCDisassembler_Success; } static DecodeStatus Mips64Disassembler_getInstruction(int mode, MCInst *instr, const uint8_t *code, size_t code_len, uint16_t *Size, uint64_t Address, bool isBigEndian, MCRegisterInfo *MRI) { uint32_t Insn; DecodeStatus Result = readInstruction32((unsigned char*)code, &Insn, isBigEndian, false); if (Result == MCDisassembler_Fail) return MCDisassembler_Fail; if (instr->flat_insn->detail) { memset(instr->flat_insn->detail, 0, sizeof(cs_detail)); } // Calling the auto-generated decoder function. Result = decodeInstruction(DecoderTableMips6432, instr, Insn, Address, MRI, mode); if (Result != MCDisassembler_Fail) { *Size = 4; return Result; } // If we fail to decode in Mips64 decoder space we can try in Mips32 Result = decodeInstruction(DecoderTableMips32, instr, Insn, Address, MRI, mode); if (Result != MCDisassembler_Fail) { *Size = 4; return Result; } return MCDisassembler_Fail; } bool Mips64_getInstruction(csh ud, const uint8_t *code, size_t code_len, MCInst *instr, uint16_t *size, uint64_t address, void *info) { cs_struct *handle = (cs_struct *)(uintptr_t)ud; DecodeStatus status = Mips64Disassembler_getInstruction(handle->mode, instr, code, code_len, size, address, handle->big_endian, (MCRegisterInfo *)info); return status == MCDisassembler_Success; } static unsigned getReg(MCRegisterInfo *MRI, unsigned RC, unsigned RegNo) { //MipsDisassemblerBase *Dis = static_cast(D); //return *(Dis->getRegInfo()->getRegClass(RC).begin() + RegNo); MCRegisterClass *rc = MCRegisterInfo_getRegClass(MRI, RC); return rc->RegsBegin[RegNo]; } #define nullptr NULL static DecodeStatus DecodeINSVE_DF_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder) { typedef DecodeStatus (*DecodeFN)(MCInst *, unsigned, uint64_t, MCRegisterInfo *); // The size of the n field depends on the element size // The register class also depends on this. uint32_t tmp = fieldFromInstruction(insn, 17, 5); unsigned NSize = 0; DecodeFN RegDecoder = nullptr; if ((tmp & 0x18) == 0x00) { // INSVE_B NSize = 4; RegDecoder = DecodeMSA128BRegisterClass; } else if ((tmp & 0x1c) == 0x10) { // INSVE_H NSize = 3; RegDecoder = DecodeMSA128HRegisterClass; } else if ((tmp & 0x1e) == 0x18) { // INSVE_W NSize = 2; RegDecoder = DecodeMSA128WRegisterClass; } else if ((tmp & 0x1f) == 0x1c) { // INSVE_D NSize = 1; RegDecoder = DecodeMSA128DRegisterClass; } //else llvm_unreachable("Invalid encoding"); //assert(NSize != 0 && RegDecoder != nullptr); // $wd tmp = fieldFromInstruction(insn, 6, 5); if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler_Fail) return MCDisassembler_Fail; // $wd_in if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler_Fail) return MCDisassembler_Fail; // $n tmp = fieldFromInstruction(insn, 16, NSize); MCOperand_CreateImm0(MI, tmp); // $ws tmp = fieldFromInstruction(insn, 11, 5); if (RegDecoder(MI, tmp, Address, Decoder) == MCDisassembler_Fail) return MCDisassembler_Fail; // $n2 MCOperand_CreateImm0(MI, 0); return MCDisassembler_Success; } static DecodeStatus DecodeAddiGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder) { // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled // (otherwise we would have matched the ADDI instruction from the earlier // ISA's instead). // // We have: // 0b001000 sssss ttttt iiiiiiiiiiiiiiii // BOVC if rs >= rt // BEQZALC if rs == 0 && rt != 0 // BEQC if rs < rt && rs != 0 uint32_t Rs = fieldFromInstruction(insn, 21, 5); uint32_t Rt = fieldFromInstruction(insn, 16, 5); uint32_t Imm = (uint32_t)SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; bool HasRs = false; if (Rs >= Rt) { MCInst_setOpcode(MI, Mips_BOVC); HasRs = true; } else if (Rs != 0 && Rs < Rt) { MCInst_setOpcode(MI, Mips_BEQC); HasRs = true; } else MCInst_setOpcode(MI, Mips_BEQZALC); if (HasRs) MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rs)); MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rt)); MCOperand_CreateImm0(MI, Imm); return MCDisassembler_Success; } static DecodeStatus DecodeDaddiGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder) { // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled // (otherwise we would have matched the ADDI instruction from the earlier // ISA's instead). // // We have: // 0b011000 sssss ttttt iiiiiiiiiiiiiiii // BNVC if rs >= rt // BNEZALC if rs == 0 && rt != 0 // BNEC if rs < rt && rs != 0 uint32_t Rs = fieldFromInstruction(insn, 21, 5); uint32_t Rt = fieldFromInstruction(insn, 16, 5); uint32_t Imm = (uint32_t)SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; bool HasRs = false; if (Rs >= Rt) { MCInst_setOpcode(MI, Mips_BNVC); HasRs = true; } else if (Rs != 0 && Rs < Rt) { MCInst_setOpcode(MI, Mips_BNEC); HasRs = true; } else MCInst_setOpcode(MI, Mips_BNEZALC); if (HasRs) MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rs)); MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rt)); MCOperand_CreateImm0(MI, Imm); return MCDisassembler_Success; } static DecodeStatus DecodeBlezlGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder) { // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled // (otherwise we would have matched the BLEZL instruction from the earlier // ISA's instead). // // We have: // 0b010110 sssss ttttt iiiiiiiiiiiiiiii // Invalid if rs == 0 // BLEZC if rs == 0 && rt != 0 // BGEZC if rs == rt && rt != 0 // BGEC if rs != rt && rs != 0 && rt != 0 uint32_t Rs = fieldFromInstruction(insn, 21, 5); uint32_t Rt = fieldFromInstruction(insn, 16, 5); uint32_t Imm = (uint32_t)SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; bool HasRs = false; if (Rt == 0) return MCDisassembler_Fail; else if (Rs == 0) MCInst_setOpcode(MI, Mips_BLEZC); else if (Rs == Rt) MCInst_setOpcode(MI, Mips_BGEZC); else { HasRs = true; MCInst_setOpcode(MI, Mips_BGEC); } if (HasRs) MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rs)); MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rt)); MCOperand_CreateImm0(MI, Imm); return MCDisassembler_Success; } static DecodeStatus DecodeBgtzlGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder) { // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled // (otherwise we would have matched the BGTZL instruction from the earlier // ISA's instead). // // We have: // 0b010111 sssss ttttt iiiiiiiiiiiiiiii // Invalid if rs == 0 // BGTZC if rs == 0 && rt != 0 // BLTZC if rs == rt && rt != 0 // BLTC if rs != rt && rs != 0 && rt != 0 bool HasRs = false; uint32_t Rs = fieldFromInstruction(insn, 21, 5); uint32_t Rt = fieldFromInstruction(insn, 16, 5); uint32_t Imm = (uint32_t)SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; if (Rt == 0) return MCDisassembler_Fail; else if (Rs == 0) MCInst_setOpcode(MI, Mips_BGTZC); else if (Rs == Rt) MCInst_setOpcode(MI, Mips_BLTZC); else { MCInst_setOpcode(MI, Mips_BLTC); HasRs = true; } if (HasRs) MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rs)); MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rt)); MCOperand_CreateImm0(MI, Imm); return MCDisassembler_Success; } static DecodeStatus DecodeBgtzGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder) { // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled // (otherwise we would have matched the BGTZ instruction from the earlier // ISA's instead). // // We have: // 0b000111 sssss ttttt iiiiiiiiiiiiiiii // BGTZ if rt == 0 // BGTZALC if rs == 0 && rt != 0 // BLTZALC if rs != 0 && rs == rt // BLTUC if rs != 0 && rs != rt uint32_t Rs = fieldFromInstruction(insn, 21, 5); uint32_t Rt = fieldFromInstruction(insn, 16, 5); uint32_t Imm = (uint32_t)SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; bool HasRs = false; bool HasRt = false; if (Rt == 0) { MCInst_setOpcode(MI, Mips_BGTZ); HasRs = true; } else if (Rs == 0) { MCInst_setOpcode(MI, Mips_BGTZALC); HasRt = true; } else if (Rs == Rt) { MCInst_setOpcode(MI, Mips_BLTZALC); HasRs = true; } else { MCInst_setOpcode(MI, Mips_BLTUC); HasRs = true; HasRt = true; } if (HasRs) MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rs)); if (HasRt) MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rt)); MCOperand_CreateImm0(MI, Imm); return MCDisassembler_Success; } static DecodeStatus DecodeBlezGroupBranch_4(MCInst *MI, uint32_t insn, uint64_t Address, MCRegisterInfo *Decoder) { // If we are called then we can assume that MIPS32r6/MIPS64r6 is enabled // (otherwise we would have matched the BLEZL instruction from the earlier // ISA's instead). // // We have: // 0b000110 sssss ttttt iiiiiiiiiiiiiiii // Invalid if rs == 0 // BLEZALC if rs == 0 && rt != 0 // BGEZALC if rs == rt && rt != 0 // BGEUC if rs != rt && rs != 0 && rt != 0 uint32_t Rs = fieldFromInstruction(insn, 21, 5); uint32_t Rt = fieldFromInstruction(insn, 16, 5); uint32_t Imm = (uint32_t)SignExtend64(fieldFromInstruction(insn, 0, 16), 16) * 4; bool HasRs = false; if (Rt == 0) return MCDisassembler_Fail; else if (Rs == 0) MCInst_setOpcode(MI, Mips_BLEZALC); else if (Rs == Rt) MCInst_setOpcode(MI, Mips_BGEZALC); else { HasRs = true; MCInst_setOpcode(MI, Mips_BGEUC); } if (HasRs) MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rs)); MCOperand_CreateReg0(MI, getReg(Decoder, Mips_GPR32RegClassID, Rt)); MCOperand_CreateImm0(MI, Imm); return MCDisassembler_Success; } static DecodeStatus DecodeCPU16RegsRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { return MCDisassembler_Fail; } static DecodeStatus DecodeGPR64RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 31) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_GPR64RegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeGPR32RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 31) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_GPR32RegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodePtrRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { if (Inst->csh->mode & CS_MODE_N64) return DecodeGPR64RegisterClass(Inst, RegNo, Address, Decoder); return DecodeGPR32RegisterClass(Inst, RegNo, Address, Decoder); } static DecodeStatus DecodeDSPRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { return DecodeGPR32RegisterClass(Inst, RegNo, Address, Decoder); } static DecodeStatus DecodeFGR64RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 31) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_FGR64RegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeFGR32RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 31) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_FGR32RegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeCCRRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 31) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_CCRRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeFCCRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 7) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_FCCRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeCCRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 7) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_CCRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeFGRCCRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 31) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_FGRCCRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeMem(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { int Offset = SignExtend32(Insn & 0xffff, 16); unsigned Reg = fieldFromInstruction(Insn, 16, 5); unsigned Base = fieldFromInstruction(Insn, 21, 5); Reg = getReg(Decoder, Mips_GPR32RegClassID, Reg); Base = getReg(Decoder, Mips_GPR32RegClassID, Base); if (MCInst_getOpcode(Inst) == Mips_SC){ MCOperand_CreateReg0(Inst, Reg); } MCOperand_CreateReg0(Inst, Reg); MCOperand_CreateReg0(Inst, Base); MCOperand_CreateImm0(Inst, Offset); return MCDisassembler_Success; } static DecodeStatus DecodeCachePref(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { int Offset = SignExtend32(Insn & 0xffff, 16); unsigned Hint = fieldFromInstruction(Insn, 16, 5); unsigned Base = fieldFromInstruction(Insn, 21, 5); Base = getReg(Decoder, Mips_GPR32RegClassID, Base); MCOperand_CreateReg0(Inst, Base); MCOperand_CreateImm0(Inst, Offset); MCOperand_CreateImm0(Inst, Hint); return MCDisassembler_Success; } static DecodeStatus DecodeMSA128Mem(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { int Offset = SignExtend32(fieldFromInstruction(Insn, 16, 10), 10); unsigned Reg = fieldFromInstruction(Insn, 6, 5); unsigned Base = fieldFromInstruction(Insn, 11, 5); Reg = getReg(Decoder, Mips_MSA128BRegClassID, Reg); Base = getReg(Decoder, Mips_GPR32RegClassID, Base); MCOperand_CreateReg0(Inst, Reg); MCOperand_CreateReg0(Inst, Base); // MCOperand_CreateImm0(Inst, Offset); // The immediate field of an LD/ST instruction is scaled which means it must // be multiplied (when decoding) by the size (in bytes) of the instructions' // data format. // .b - 1 byte // .h - 2 bytes // .w - 4 bytes // .d - 8 bytes switch(MCInst_getOpcode(Inst)) { default: //assert (0 && "Unexpected instruction"); return MCDisassembler_Fail; break; case Mips_LD_B: case Mips_ST_B: MCOperand_CreateImm0(Inst, Offset); break; case Mips_LD_H: case Mips_ST_H: MCOperand_CreateImm0(Inst, Offset * 2); break; case Mips_LD_W: case Mips_ST_W: MCOperand_CreateImm0(Inst, Offset * 4); break; case Mips_LD_D: case Mips_ST_D: MCOperand_CreateImm0(Inst, Offset * 8); break; } return MCDisassembler_Success; } static DecodeStatus DecodeMemMMImm12(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { int Offset = SignExtend32(Insn & 0x0fff, 12); unsigned Reg = fieldFromInstruction(Insn, 21, 5); unsigned Base = fieldFromInstruction(Insn, 16, 5); Reg = getReg(Decoder, Mips_GPR32RegClassID, Reg); Base = getReg(Decoder, Mips_GPR32RegClassID, Base); if (MCInst_getOpcode(Inst) == Mips_SC_MM) MCOperand_CreateReg0(Inst, Reg); MCOperand_CreateReg0(Inst, Reg); MCOperand_CreateReg0(Inst, Base); MCOperand_CreateImm0(Inst, Offset); return MCDisassembler_Success; } static DecodeStatus DecodeMemMMImm16(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { int Offset = SignExtend32(Insn & 0xffff, 16); unsigned Reg = fieldFromInstruction(Insn, 21, 5); unsigned Base = fieldFromInstruction(Insn, 16, 5); Reg = getReg(Decoder, Mips_GPR32RegClassID, Reg); Base = getReg(Decoder, Mips_GPR32RegClassID, Base); MCOperand_CreateReg0(Inst, Reg); MCOperand_CreateReg0(Inst, Base); MCOperand_CreateImm0(Inst, Offset); return MCDisassembler_Success; } static DecodeStatus DecodeFMem(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { int Offset = SignExtend32(Insn & 0xffff, 16); unsigned Reg = fieldFromInstruction(Insn, 16, 5); unsigned Base = fieldFromInstruction(Insn, 21, 5); Reg = getReg(Decoder, Mips_FGR64RegClassID, Reg); Base = getReg(Decoder, Mips_GPR32RegClassID, Base); MCOperand_CreateReg0(Inst, Reg); MCOperand_CreateReg0(Inst, Base); MCOperand_CreateImm0(Inst, Offset); return MCDisassembler_Success; } static DecodeStatus DecodeCOP2Mem(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { int Offset = SignExtend32(Insn & 0xffff, 16); unsigned Reg = fieldFromInstruction(Insn, 16, 5); unsigned Base = fieldFromInstruction(Insn, 21, 5); Reg = getReg(Decoder, Mips_COP2RegClassID, Reg); Base = getReg(Decoder, Mips_GPR32RegClassID, Base); MCOperand_CreateReg0(Inst, Reg); MCOperand_CreateReg0(Inst, Base); MCOperand_CreateImm0(Inst, Offset); return MCDisassembler_Success; } static DecodeStatus DecodeCOP3Mem(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { int Offset = SignExtend32(Insn & 0xffff, 16); unsigned Reg = fieldFromInstruction(Insn, 16, 5); unsigned Base = fieldFromInstruction(Insn, 21, 5); Reg = getReg(Decoder, Mips_COP3RegClassID, Reg); Base = getReg(Decoder, Mips_GPR32RegClassID, Base); MCOperand_CreateReg0(Inst, Reg); MCOperand_CreateReg0(Inst, Base); MCOperand_CreateImm0(Inst, Offset); return MCDisassembler_Success; } static DecodeStatus DecodeSpecial3LlSc(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { int64_t Offset = SignExtend64((Insn >> 7) & 0x1ff, 9); unsigned Rt = fieldFromInstruction(Insn, 16, 5); unsigned Base = fieldFromInstruction(Insn, 21, 5); Rt = getReg(Decoder, Mips_GPR32RegClassID, Rt); Base = getReg(Decoder, Mips_GPR32RegClassID, Base); if (MCInst_getOpcode(Inst) == Mips_SC_R6 || MCInst_getOpcode(Inst) == Mips_SCD_R6) { MCOperand_CreateReg0(Inst, Rt); } MCOperand_CreateReg0(Inst, Rt); MCOperand_CreateReg0(Inst, Base); MCOperand_CreateImm0(Inst, Offset); return MCDisassembler_Success; } static DecodeStatus DecodeHWRegsRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { // Currently only hardware register 29 is supported. if (RegNo != 29) return MCDisassembler_Fail; MCOperand_CreateReg0(Inst, Mips_HWR29); return MCDisassembler_Success; } static DecodeStatus DecodeAFGR64RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 30 || RegNo % 2) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_AFGR64RegClassID, RegNo /2); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeACC64DSPRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo >= 4) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_ACC64DSPRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeHI32DSPRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo >= 4) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_HI32DSPRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeLO32DSPRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo >= 4) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_LO32DSPRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeMSA128BRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 31) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_MSA128BRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeMSA128HRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 31) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_MSA128HRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeMSA128WRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 31) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_MSA128WRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeMSA128DRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 31) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_MSA128DRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeMSACtrlRegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 7) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_MSACtrlRegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeCOP2RegisterClass(MCInst *Inst, unsigned RegNo, uint64_t Address, MCRegisterInfo *Decoder) { unsigned Reg; if (RegNo > 31) return MCDisassembler_Fail; Reg = getReg(Decoder, Mips_COP2RegClassID, RegNo); MCOperand_CreateReg0(Inst, Reg); return MCDisassembler_Success; } static DecodeStatus DecodeBranchTarget(MCInst *Inst, unsigned Offset, uint64_t Address, MCRegisterInfo *Decoder) { int32_t BranchOffset = (SignExtend32(Offset, 16) * 4) + 4; MCOperand_CreateImm0(Inst, BranchOffset); return MCDisassembler_Success; } static DecodeStatus DecodeJumpTarget(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { unsigned JumpOffset = fieldFromInstruction(Insn, 0, 26) << 2; MCOperand_CreateImm0(Inst, JumpOffset); return MCDisassembler_Success; } static DecodeStatus DecodeBranchTarget21(MCInst *Inst, unsigned Offset, uint64_t Address, MCRegisterInfo *Decoder) { int32_t BranchOffset = SignExtend32(Offset, 21) * 4; MCOperand_CreateImm0(Inst, BranchOffset); return MCDisassembler_Success; } static DecodeStatus DecodeBranchTarget26(MCInst *Inst, unsigned Offset, uint64_t Address, MCRegisterInfo *Decoder) { int32_t BranchOffset = SignExtend32(Offset, 26) * 4; MCOperand_CreateImm0(Inst, BranchOffset); return MCDisassembler_Success; } static DecodeStatus DecodeBranchTargetMM(MCInst *Inst, unsigned Offset, uint64_t Address, MCRegisterInfo *Decoder) { int32_t BranchOffset = SignExtend32(Offset, 16) * 2; MCOperand_CreateImm0(Inst, BranchOffset); return MCDisassembler_Success; } static DecodeStatus DecodeJumpTargetMM(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { unsigned JumpOffset = fieldFromInstruction(Insn, 0, 26) << 1; MCOperand_CreateImm0(Inst, JumpOffset); return MCDisassembler_Success; } static DecodeStatus DecodeSimm16(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { MCOperand_CreateImm0(Inst, SignExtend32(Insn, 16)); return MCDisassembler_Success; } static DecodeStatus DecodeLSAImm(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { // We add one to the immediate field as it was encoded as 'imm - 1'. MCOperand_CreateImm0(Inst, Insn + 1); return MCDisassembler_Success; } static DecodeStatus DecodeInsSize(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { // First we need to grab the pos(lsb) from MCInst. int Pos = (int)MCOperand_getImm(MCInst_getOperand(Inst, 2)); int Size = (int) Insn - Pos + 1; MCOperand_CreateImm0(Inst, SignExtend32(Size, 16)); return MCDisassembler_Success; } static DecodeStatus DecodeExtSize(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { int Size = (int) Insn + 1; MCOperand_CreateImm0(Inst, SignExtend32(Size, 16)); return MCDisassembler_Success; } static DecodeStatus DecodeSimm19Lsl2(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { MCOperand_CreateImm0(Inst, SignExtend32(Insn, 19) * 4); return MCDisassembler_Success; } static DecodeStatus DecodeSimm18Lsl3(MCInst *Inst, unsigned Insn, uint64_t Address, MCRegisterInfo *Decoder) { MCOperand_CreateImm0(Inst, SignExtend32(Insn, 18) * 8); return MCDisassembler_Success; } #endif