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Diffstat (limited to 'lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp')
| -rw-r--r-- | lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp b/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp new file mode 100644 index 000000000000..a2305a9efc71 --- /dev/null +++ b/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp @@ -0,0 +1,348 @@ +//===------ PPCDisassembler.cpp - Disassembler for PowerPC ------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#include "PPC.h" +#include "llvm/MC/MCDisassembler.h" +#include "llvm/MC/MCFixedLenDisassembler.h" +#include "llvm/MC/MCInst.h" +#include "llvm/MC/MCSubtargetInfo.h" +#include "llvm/Support/MemoryObject.h" +#include "llvm/Support/TargetRegistry.h" + +using namespace llvm; + +#define DEBUG_TYPE "ppc-disassembler" + +typedef MCDisassembler::DecodeStatus DecodeStatus; + +namespace { +class PPCDisassembler : public MCDisassembler { +public: + PPCDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx) + : MCDisassembler(STI, Ctx) {} + virtual ~PPCDisassembler() {} + + // Override MCDisassembler. + virtual DecodeStatus getInstruction(MCInst &instr, + uint64_t &size, + const MemoryObject ®ion, + uint64_t address, + raw_ostream &vStream, + raw_ostream &cStream) const override; +}; +} // end anonymous namespace + +static MCDisassembler *createPPCDisassembler(const Target &T, + const MCSubtargetInfo &STI, + MCContext &Ctx) { + return new PPCDisassembler(STI, Ctx); +} + +extern "C" void LLVMInitializePowerPCDisassembler() { + // Register the disassembler for each target. + TargetRegistry::RegisterMCDisassembler(ThePPC32Target, + createPPCDisassembler); + TargetRegistry::RegisterMCDisassembler(ThePPC64Target, + createPPCDisassembler); + TargetRegistry::RegisterMCDisassembler(ThePPC64LETarget, + createPPCDisassembler); +} + +// FIXME: These can be generated by TableGen from the existing register +// encoding values! + +static const unsigned CRRegs[] = { + PPC::CR0, PPC::CR1, PPC::CR2, PPC::CR3, + PPC::CR4, PPC::CR5, PPC::CR6, PPC::CR7 +}; + +static const unsigned CRBITRegs[] = { + PPC::CR0LT, PPC::CR0GT, PPC::CR0EQ, PPC::CR0UN, + PPC::CR1LT, PPC::CR1GT, PPC::CR1EQ, PPC::CR1UN, + PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN, + PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN, + PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN, + PPC::CR5LT, PPC::CR5GT, PPC::CR5EQ, PPC::CR5UN, + PPC::CR6LT, PPC::CR6GT, PPC::CR6EQ, PPC::CR6UN, + PPC::CR7LT, PPC::CR7GT, PPC::CR7EQ, PPC::CR7UN +}; + +static const unsigned FRegs[] = { + PPC::F0, PPC::F1, PPC::F2, PPC::F3, + PPC::F4, PPC::F5, PPC::F6, PPC::F7, + PPC::F8, PPC::F9, PPC::F10, PPC::F11, + PPC::F12, PPC::F13, PPC::F14, PPC::F15, + PPC::F16, PPC::F17, PPC::F18, PPC::F19, + PPC::F20, PPC::F21, PPC::F22, PPC::F23, + PPC::F24, PPC::F25, PPC::F26, PPC::F27, + PPC::F28, PPC::F29, PPC::F30, PPC::F31 +}; + +static const unsigned VRegs[] = { + PPC::V0, PPC::V1, PPC::V2, PPC::V3, + PPC::V4, PPC::V5, PPC::V6, PPC::V7, + PPC::V8, PPC::V9, PPC::V10, PPC::V11, + PPC::V12, PPC::V13, PPC::V14, PPC::V15, + PPC::V16, PPC::V17, PPC::V18, PPC::V19, + PPC::V20, PPC::V21, PPC::V22, PPC::V23, + PPC::V24, PPC::V25, PPC::V26, PPC::V27, + PPC::V28, PPC::V29, PPC::V30, PPC::V31 +}; + +static const unsigned VSRegs[] = { + PPC::VSL0, PPC::VSL1, PPC::VSL2, PPC::VSL3, + PPC::VSL4, PPC::VSL5, PPC::VSL6, PPC::VSL7, + PPC::VSL8, PPC::VSL9, PPC::VSL10, PPC::VSL11, + PPC::VSL12, PPC::VSL13, PPC::VSL14, PPC::VSL15, + PPC::VSL16, PPC::VSL17, PPC::VSL18, PPC::VSL19, + PPC::VSL20, PPC::VSL21, PPC::VSL22, PPC::VSL23, + PPC::VSL24, PPC::VSL25, PPC::VSL26, PPC::VSL27, + PPC::VSL28, PPC::VSL29, PPC::VSL30, PPC::VSL31, + + PPC::VSH0, PPC::VSH1, PPC::VSH2, PPC::VSH3, + PPC::VSH4, PPC::VSH5, PPC::VSH6, PPC::VSH7, + PPC::VSH8, PPC::VSH9, PPC::VSH10, PPC::VSH11, + PPC::VSH12, PPC::VSH13, PPC::VSH14, PPC::VSH15, + PPC::VSH16, PPC::VSH17, PPC::VSH18, PPC::VSH19, + PPC::VSH20, PPC::VSH21, PPC::VSH22, PPC::VSH23, + PPC::VSH24, PPC::VSH25, PPC::VSH26, PPC::VSH27, + PPC::VSH28, PPC::VSH29, PPC::VSH30, PPC::VSH31 +}; + +static const unsigned VSFRegs[] = { + PPC::F0, PPC::F1, PPC::F2, PPC::F3, + PPC::F4, PPC::F5, PPC::F6, PPC::F7, + PPC::F8, PPC::F9, PPC::F10, PPC::F11, + PPC::F12, PPC::F13, PPC::F14, PPC::F15, + PPC::F16, PPC::F17, PPC::F18, PPC::F19, + PPC::F20, PPC::F21, PPC::F22, PPC::F23, + PPC::F24, PPC::F25, PPC::F26, PPC::F27, + PPC::F28, PPC::F29, PPC::F30, PPC::F31, + + PPC::VF0, PPC::VF1, PPC::VF2, PPC::VF3, + PPC::VF4, PPC::VF5, PPC::VF6, PPC::VF7, + PPC::VF8, PPC::VF9, PPC::VF10, PPC::VF11, + PPC::VF12, PPC::VF13, PPC::VF14, PPC::VF15, + PPC::VF16, PPC::VF17, PPC::VF18, PPC::VF19, + PPC::VF20, PPC::VF21, PPC::VF22, PPC::VF23, + PPC::VF24, PPC::VF25, PPC::VF26, PPC::VF27, + PPC::VF28, PPC::VF29, PPC::VF30, PPC::VF31 +}; + +static const unsigned GPRegs[] = { + PPC::R0, PPC::R1, PPC::R2, PPC::R3, + PPC::R4, PPC::R5, PPC::R6, PPC::R7, + PPC::R8, PPC::R9, PPC::R10, PPC::R11, + PPC::R12, PPC::R13, PPC::R14, PPC::R15, + PPC::R16, PPC::R17, PPC::R18, PPC::R19, + PPC::R20, PPC::R21, PPC::R22, PPC::R23, + PPC::R24, PPC::R25, PPC::R26, PPC::R27, + PPC::R28, PPC::R29, PPC::R30, PPC::R31 +}; + +static const unsigned GP0Regs[] = { + PPC::ZERO, PPC::R1, PPC::R2, PPC::R3, + PPC::R4, PPC::R5, PPC::R6, PPC::R7, + PPC::R8, PPC::R9, PPC::R10, PPC::R11, + PPC::R12, PPC::R13, PPC::R14, PPC::R15, + PPC::R16, PPC::R17, PPC::R18, PPC::R19, + PPC::R20, PPC::R21, PPC::R22, PPC::R23, + PPC::R24, PPC::R25, PPC::R26, PPC::R27, + PPC::R28, PPC::R29, PPC::R30, PPC::R31 +}; + +static const unsigned G8Regs[] = { + PPC::X0, PPC::X1, PPC::X2, PPC::X3, + PPC::X4, PPC::X5, PPC::X6, PPC::X7, + PPC::X8, PPC::X9, PPC::X10, PPC::X11, + PPC::X12, PPC::X13, PPC::X14, PPC::X15, + PPC::X16, PPC::X17, PPC::X18, PPC::X19, + PPC::X20, PPC::X21, PPC::X22, PPC::X23, + PPC::X24, PPC::X25, PPC::X26, PPC::X27, + PPC::X28, PPC::X29, PPC::X30, PPC::X31 +}; + +template <std::size_t N> +static DecodeStatus decodeRegisterClass(MCInst &Inst, uint64_t RegNo, + const unsigned (&Regs)[N]) { + assert(RegNo < N && "Invalid register number"); + Inst.addOperand(MCOperand::CreateReg(Regs[RegNo])); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeCRRCRegisterClass(MCInst &Inst, uint64_t RegNo, + uint64_t Address, + const void *Decoder) { + return decodeRegisterClass(Inst, RegNo, CRRegs); +} + +static DecodeStatus DecodeCRBITRCRegisterClass(MCInst &Inst, uint64_t RegNo, + uint64_t Address, + const void *Decoder) { + return decodeRegisterClass(Inst, RegNo, CRBITRegs); +} + +static DecodeStatus DecodeF4RCRegisterClass(MCInst &Inst, uint64_t RegNo, + uint64_t Address, + const void *Decoder) { + return decodeRegisterClass(Inst, RegNo, FRegs); +} + +static DecodeStatus DecodeF8RCRegisterClass(MCInst &Inst, uint64_t RegNo, + uint64_t Address, + const void *Decoder) { + return decodeRegisterClass(Inst, RegNo, FRegs); +} + +static DecodeStatus DecodeVRRCRegisterClass(MCInst &Inst, uint64_t RegNo, + uint64_t Address, + const void *Decoder) { + return decodeRegisterClass(Inst, RegNo, VRegs); +} + +static DecodeStatus DecodeVSRCRegisterClass(MCInst &Inst, uint64_t RegNo, + uint64_t Address, + const void *Decoder) { + return decodeRegisterClass(Inst, RegNo, VSRegs); +} + +static DecodeStatus DecodeVSFRCRegisterClass(MCInst &Inst, uint64_t RegNo, + uint64_t Address, + const void *Decoder) { + return decodeRegisterClass(Inst, RegNo, VSFRegs); +} + +static DecodeStatus DecodeGPRCRegisterClass(MCInst &Inst, uint64_t RegNo, + uint64_t Address, + const void *Decoder) { + return decodeRegisterClass(Inst, RegNo, GPRegs); +} + +static DecodeStatus DecodeGPRC_NOR0RegisterClass(MCInst &Inst, uint64_t RegNo, + uint64_t Address, + const void *Decoder) { + return decodeRegisterClass(Inst, RegNo, GP0Regs); +} + +static DecodeStatus DecodeG8RCRegisterClass(MCInst &Inst, uint64_t RegNo, + uint64_t Address, + const void *Decoder) { + return decodeRegisterClass(Inst, RegNo, G8Regs); +} + +#define DecodePointerLikeRegClass0 DecodeGPRCRegisterClass +#define DecodePointerLikeRegClass1 DecodeGPRC_NOR0RegisterClass + +template<unsigned N> +static DecodeStatus decodeUImmOperand(MCInst &Inst, uint64_t Imm, + int64_t Address, const void *Decoder) { + assert(isUInt<N>(Imm) && "Invalid immediate"); + Inst.addOperand(MCOperand::CreateImm(Imm)); + return MCDisassembler::Success; +} + +template<unsigned N> +static DecodeStatus decodeSImmOperand(MCInst &Inst, uint64_t Imm, + int64_t Address, const void *Decoder) { + assert(isUInt<N>(Imm) && "Invalid immediate"); + Inst.addOperand(MCOperand::CreateImm(SignExtend64<N>(Imm))); + return MCDisassembler::Success; +} + +static DecodeStatus decodeMemRIOperands(MCInst &Inst, uint64_t Imm, + int64_t Address, const void *Decoder) { + // Decode the memri field (imm, reg), which has the low 16-bits as the + // displacement and the next 5 bits as the register #. + + uint64_t Base = Imm >> 16; + uint64_t Disp = Imm & 0xFFFF; + + assert(Base < 32 && "Invalid base register"); + + switch (Inst.getOpcode()) { + default: break; + case PPC::LBZU: + case PPC::LHAU: + case PPC::LHZU: + case PPC::LWZU: + case PPC::LFSU: + case PPC::LFDU: + // Add the tied output operand. + Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base])); + break; + case PPC::STBU: + case PPC::STHU: + case PPC::STWU: + case PPC::STFSU: + case PPC::STFDU: + Inst.insert(Inst.begin(), MCOperand::CreateReg(GP0Regs[Base])); + break; + } + + Inst.addOperand(MCOperand::CreateImm(SignExtend64<16>(Disp))); + Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base])); + return MCDisassembler::Success; +} + +static DecodeStatus decodeMemRIXOperands(MCInst &Inst, uint64_t Imm, + int64_t Address, const void *Decoder) { + // Decode the memrix field (imm, reg), which has the low 14-bits as the + // displacement and the next 5 bits as the register #. + + uint64_t Base = Imm >> 14; + uint64_t Disp = Imm & 0x3FFF; + + assert(Base < 32 && "Invalid base register"); + + if (Inst.getOpcode() == PPC::LDU) + // Add the tied output operand. + Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base])); + else if (Inst.getOpcode() == PPC::STDU) + Inst.insert(Inst.begin(), MCOperand::CreateReg(GP0Regs[Base])); + + Inst.addOperand(MCOperand::CreateImm(SignExtend64<16>(Disp << 2))); + Inst.addOperand(MCOperand::CreateReg(GP0Regs[Base])); + return MCDisassembler::Success; +} + +static DecodeStatus decodeCRBitMOperand(MCInst &Inst, uint64_t Imm, + int64_t Address, const void *Decoder) { + // The cr bit encoding is 0x80 >> cr_reg_num. + + unsigned Zeros = countTrailingZeros(Imm); + assert(Zeros < 8 && "Invalid CR bit value"); + + Inst.addOperand(MCOperand::CreateReg(CRRegs[7 - Zeros])); + return MCDisassembler::Success; +} + +#include "PPCGenDisassemblerTables.inc" + +DecodeStatus PPCDisassembler::getInstruction(MCInst &MI, uint64_t &Size, + const MemoryObject &Region, + uint64_t Address, + raw_ostream &os, + raw_ostream &cs) const { + // Get the four bytes of the instruction. + uint8_t Bytes[4]; + Size = 4; + if (Region.readBytes(Address, Size, Bytes) == -1) { + Size = 0; + return MCDisassembler::Fail; + } + + // The instruction is big-endian encoded. + uint32_t Inst = (Bytes[0] << 24) | + (Bytes[1] << 16) | + (Bytes[2] << 8) | + (Bytes[3] << 0); + + return decodeInstruction(DecoderTable32, MI, Inst, Address, this, STI); +} + |