//===------ 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);
}