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Diffstat (limited to 'contrib/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp b/contrib/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp new file mode 100644 index 0000000..6233805 --- /dev/null +++ b/contrib/llvm/lib/Target/Sparc/Disassembler/SparcDisassembler.cpp @@ -0,0 +1,228 @@ +//===- SparcDisassembler.cpp - Disassembler for Sparc -----------*- 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 Sparc Disassembler. +// +//===----------------------------------------------------------------------===// + +#define DEBUG_TYPE "sparc-disassembler" + +#include "Sparc.h" +#include "SparcRegisterInfo.h" +#include "SparcSubtarget.h" +#include "llvm/MC/MCDisassembler.h" +#include "llvm/MC/MCFixedLenDisassembler.h" +#include "llvm/Support/MemoryObject.h" +#include "llvm/Support/TargetRegistry.h" + +using namespace llvm; + +typedef MCDisassembler::DecodeStatus DecodeStatus; + +namespace { + +/// SparcDisassembler - a disassembler class for Sparc. +class SparcDisassembler : public MCDisassembler { +public: + /// Constructor - Initializes the disassembler. + /// + SparcDisassembler(const MCSubtargetInfo &STI, const MCRegisterInfo *Info) : + MCDisassembler(STI), RegInfo(Info) + {} + virtual ~SparcDisassembler() {} + + const MCRegisterInfo *getRegInfo() const { return RegInfo.get(); } + + /// getInstruction - See MCDisassembler. + virtual DecodeStatus getInstruction(MCInst &instr, + uint64_t &size, + const MemoryObject ®ion, + uint64_t address, + raw_ostream &vStream, + raw_ostream &cStream) const; +private: + OwningPtr<const MCRegisterInfo> RegInfo; +}; + +} + +namespace llvm { + extern Target TheSparcTarget, TheSparcV9Target; +} + +static MCDisassembler *createSparcDisassembler( + const Target &T, + const MCSubtargetInfo &STI) { + return new SparcDisassembler(STI, T.createMCRegInfo("")); +} + + +extern "C" void LLVMInitializeSparcDisassembler() { + // Register the disassembler. + TargetRegistry::RegisterMCDisassembler(TheSparcTarget, + createSparcDisassembler); + TargetRegistry::RegisterMCDisassembler(TheSparcV9Target, + createSparcDisassembler); +} + + + +static const unsigned IntRegDecoderTable[] = { + SP::G0, SP::G1, SP::G2, SP::G3, + SP::G4, SP::G5, SP::G6, SP::G7, + SP::O0, SP::O1, SP::O2, SP::O3, + SP::O4, SP::O5, SP::O6, SP::O7, + SP::L0, SP::L1, SP::L2, SP::L3, + SP::L4, SP::L5, SP::L6, SP::L7, + SP::I0, SP::I1, SP::I2, SP::I3, + SP::I4, SP::I5, SP::I6, SP::I7 }; + +static const unsigned FPRegDecoderTable[] = { + SP::F0, SP::F1, SP::F2, SP::F3, + SP::F4, SP::F5, SP::F6, SP::F7, + SP::F8, SP::F9, SP::F10, SP::F11, + SP::F12, SP::F13, SP::F14, SP::F15, + SP::F16, SP::F17, SP::F18, SP::F19, + SP::F20, SP::F21, SP::F22, SP::F23, + SP::F24, SP::F25, SP::F26, SP::F27, + SP::F28, SP::F29, SP::F30, SP::F31 }; + +static const unsigned DFPRegDecoderTable[] = { + SP::D0, SP::D16, SP::D1, SP::D17, + SP::D2, SP::D18, SP::D3, SP::D19, + SP::D4, SP::D20, SP::D5, SP::D21, + SP::D6, SP::D22, SP::D7, SP::D23, + SP::D8, SP::D24, SP::D9, SP::D25, + SP::D10, SP::D26, SP::D11, SP::D27, + SP::D12, SP::D28, SP::D13, SP::D29, + SP::D14, SP::D30, SP::D15, SP::D31 }; + +static const unsigned QFPRegDecoderTable[] = { + SP::Q0, SP::Q8, ~0U, ~0U, + SP::Q1, SP::Q9, ~0U, ~0U, + SP::Q2, SP::Q10, ~0U, ~0U, + SP::Q3, SP::Q11, ~0U, ~0U, + SP::Q4, SP::Q12, ~0U, ~0U, + SP::Q5, SP::Q13, ~0U, ~0U, + SP::Q6, SP::Q14, ~0U, ~0U, + SP::Q7, SP::Q15, ~0U, ~0U } ; + +static DecodeStatus DecodeIntRegsRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + unsigned Reg = IntRegDecoderTable[RegNo]; + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + +static DecodeStatus DecodeI64RegsRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + unsigned Reg = IntRegDecoderTable[RegNo]; + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + + +static DecodeStatus DecodeFPRegsRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + unsigned Reg = FPRegDecoderTable[RegNo]; + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + + +static DecodeStatus DecodeDFPRegsRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + unsigned Reg = DFPRegDecoderTable[RegNo]; + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + + +static DecodeStatus DecodeQFPRegsRegisterClass(MCInst &Inst, + unsigned RegNo, + uint64_t Address, + const void *Decoder) { + if (RegNo > 31) + return MCDisassembler::Fail; + + unsigned Reg = QFPRegDecoderTable[RegNo]; + if (Reg == ~0U) + return MCDisassembler::Fail; + Inst.addOperand(MCOperand::CreateReg(Reg)); + return MCDisassembler::Success; +} + + +#include "SparcGenDisassemblerTables.inc" + +/// readInstruction - read four bytes from the MemoryObject +/// and return 32 bit word. +static DecodeStatus readInstruction32(const MemoryObject ®ion, + uint64_t address, + uint64_t &size, + uint32_t &insn) { + uint8_t Bytes[4]; + + // We want to read exactly 4 Bytes of data. + if (region.readBytes(address, 4, Bytes) == -1) { + size = 0; + return MCDisassembler::Fail; + } + + // Encoded as a big-endian 32-bit word in the stream. + insn = (Bytes[3] << 0) | + (Bytes[2] << 8) | + (Bytes[1] << 16) | + (Bytes[0] << 24); + + return MCDisassembler::Success; +} + + +DecodeStatus +SparcDisassembler::getInstruction(MCInst &instr, + uint64_t &Size, + const MemoryObject &Region, + uint64_t Address, + raw_ostream &vStream, + raw_ostream &cStream) const { + uint32_t Insn; + + DecodeStatus Result = readInstruction32(Region, Address, Size, Insn); + if (Result == MCDisassembler::Fail) + return MCDisassembler::Fail; + + + // Calling the auto-generated decoder function. + Result = decodeInstruction(DecoderTableSparc32, instr, Insn, Address, + this, STI); + + if (Result != MCDisassembler::Fail) { + Size = 4; + return Result; + } + + return MCDisassembler::Fail; +} |
