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//===-- 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.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCDisassembler.h"
#include "MCTargetDesc/ARMAddressingModes.h"
#include "MCTargetDesc/ARMBaseInfo.h"
#include "MCTargetDesc/ARMMCExpr.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixedLenDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MemoryObject.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include <vector>
using namespace llvm;
#define DEBUG_TYPE "arm-disassembler"
typedef MCDisassembler::DecodeStatus DecodeStatus;
namespace {
// Handles the condition code status of instructions in IT blocks
class ITStatus
{
public:
// Returns the condition code for instruction in IT block
unsigned getITCC() {
unsigned CC = ARMCC::AL;
if (instrInITBlock())
CC = ITStates.back();
return CC;
}
// Advances the IT block state to the next T or E
void advanceITState() {
ITStates.pop_back();
}
// Returns true if the current instruction is in an IT block
bool instrInITBlock() {
return !ITStates.empty();
}
// Returns true if current instruction is the last instruction in an IT block
bool instrLastInITBlock() {
return ITStates.size() == 1;
}
// 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.
void setITState(char Firstcond, char Mask) {
// (3 - the number of trailing zeros) is the number of then / else.
unsigned CondBit0 = Firstcond & 1;
unsigned NumTZ = countTrailingZeros<uint8_t>(Mask);
unsigned char CCBits = static_cast<unsigned char>(Firstcond & 0xf);
assert(NumTZ <= 3 && "Invalid IT mask!");
// push condition codes onto the stack the correct order for the pops
for (unsigned Pos = NumTZ+1; Pos <= 3; ++Pos) {
bool T = ((Mask >> Pos) & 1) == CondBit0;
if (T)
ITStates.push_back(CCBits);
else
ITStates.push_back(CCBits ^ 1);
}
ITStates.push_back(CCBits);
}
private:
std::vector<unsigned char> ITStates;
};
}
namespace {
/// ARMDisassembler - ARM disassembler for all ARM platforms.
class ARMDisassembler : public MCDisassembler {
public:
/// Constructor - Initializes the disassembler.
///
ARMDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx) :
MCDisassembler(STI, Ctx) {
}
~ARMDisassembler() {
}
/// getInstruction - See MCDisassembler.
DecodeStatus getInstruction(MCInst &instr, uint64_t &size,
const MemoryObject ®ion, uint64_t address,
raw_ostream &vStream,
raw_ostream &cStream) const override;
};
/// ThumbDisassembler - Thumb disassembler for all Thumb platforms.
class ThumbDisassembler : public MCDisassembler {
public:
/// Constructor - Initializes the disassembler.
///
ThumbDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx) :
MCDisassembler(STI, Ctx) {
}
~ThumbDisassembler() {
}
/// getInstruction - See MCDisassembler.
DecodeStatus getInstruction(MCInst &instr, uint64_t &size,
const MemoryObject ®ion, uint64_t address,
raw_ostream &vStream,
raw_ostream &cStream) const override;
private:
mutable ITStatus ITBlock;
DecodeStatus AddThumbPredicate(MCInst&) const;
void UpdateThumbVFPPredicate(MCInst&) const;
};
}
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;
}
llvm_unreachable("Invalid DecodeStatus!");
}
// 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, unsigned 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, unsigned Val,
uint64_t Address, const void *Decoder);
static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder);
static DecodeStatus DecodeMRRC2(llvm::MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder);
#include "ARMGenDisassemblerTables.inc"
static MCDisassembler *createARMDisassembler(const Target &T,
const MCSubtargetInfo &STI,
MCContext &Ctx) {
return new ARMDisassembler(STI, Ctx);
}
static MCDisassembler *createThumbDisassembler(const Target &T,
const MCSubtargetInfo &STI,
MCContext &Ctx) {
return new ThumbDisassembler(STI, Ctx);
}
DecodeStatus ARMDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
const MemoryObject &Region,
uint64_t Address,
raw_ostream &os,
raw_ostream &cs) const {
CommentStream = &cs;
uint8_t bytes[4];
assert(!(STI.getFeatureBits() & ARM::ModeThumb) &&
"Asked to disassemble an ARM instruction but Subtarget is in Thumb mode!");
// We want to read exactly 4 bytes of data.
if (Region.readBytes(Address, 4, bytes) == -1) {
Size = 0;
return MCDisassembler::Fail;
}
// Encoded as a small-endian 32-bit word in the stream.
uint32_t insn = (bytes[3] << 24) |
(bytes[2] << 16) |
(bytes[1] << 8) |
(bytes[0] << 0);
// Calling the auto-generated decoder function.
DecodeStatus result = decodeInstruction(DecoderTableARM32, MI, insn,
Address, this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
return result;
}
// VFP and NEON instructions, similarly, are shared between ARM
// and Thumb modes.
MI.clear();
result = decodeInstruction(DecoderTableVFP32, MI, insn, Address, this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
return result;
}
MI.clear();
result = decodeInstruction(DecoderTableVFPV832, MI, insn, Address, this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
return result;
}
MI.clear();
result = decodeInstruction(DecoderTableNEONData32, MI, insn, Address,
this, STI);
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, this))
return MCDisassembler::Fail;
return result;
}
MI.clear();
result = decodeInstruction(DecoderTableNEONLoadStore32, MI, insn, Address,
this, STI);
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, this))
return MCDisassembler::Fail;
return result;
}
MI.clear();
result = decodeInstruction(DecoderTableNEONDup32, MI, insn, Address,
this, STI);
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, this))
return MCDisassembler::Fail;
return result;
}
MI.clear();
result = decodeInstruction(DecoderTablev8NEON32, MI, insn, Address,
this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
return result;
}
MI.clear();
result = decodeInstruction(DecoderTablev8Crypto32, MI, insn, Address,
this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
return result;
}
MI.clear();
Size = 0;
return MCDisassembler::Fail;
}
namespace llvm {
extern const MCInstrDesc ARMInsts[];
}
/// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the
/// immediate Value in the MCInst. The immediate Value has had any PC
/// adjustment made by the caller. If the instruction is a branch instruction
/// then isBranch is true, else false. If the getOpInfo() function was set as
/// part of the setupForSymbolicDisassembly() call then that function is called
/// to get any symbolic information at the Address for this instruction. If
/// that returns non-zero then the symbolic information it returns is used to
/// create an MCExpr and that is added as an operand to the MCInst. If
/// getOpInfo() returns zero and isBranch is true then a symbol look up for
/// Value is done and if a symbol is found an MCExpr is created with that, else
/// an MCExpr with Value is created. This function returns true if it adds an
/// operand to the MCInst and false otherwise.
static bool tryAddingSymbolicOperand(uint64_t Address, int32_t Value,
bool isBranch, uint64_t InstSize,
MCInst &MI, const void *Decoder) {
const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
// FIXME: Does it make sense for value to be negative?
return Dis->tryAddingSymbolicOperand(MI, (uint32_t)Value, Address, isBranch,
/* Offset */ 0, InstSize);
}
/// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being
/// referenced by a load instruction with the base register that is the Pc.
/// These can often be values in a literal pool near the Address of the
/// instruction. The Address of the instruction and its immediate Value are
/// used as a possible literal pool entry. The SymbolLookUp call back will
/// return the name of a symbol referenced by the literal pool's entry if
/// the referenced address is that of a symbol. Or it will return a pointer to
/// a literal 'C' string if the referenced address of the literal pool's entry
/// is an address into a section with 'C' string literals.
static void tryAddingPcLoadReferenceComment(uint64_t Address, int Value,
const void *Decoder) {
const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
Dis->tryAddingPcLoadReferenceComment(Value, Address);
}
// 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) {
const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
MCInst::iterator I = MI.begin();
for (unsigned i = 0; i < NumOps; ++i, ++I) {
if (I == MI.end()) break;
if (OpInfo[i].isOptionalDef() && OpInfo[i].RegClass == ARM::CCRRegClassID) {
if (i > 0 && OpInfo[i-1].isPredicate()) continue;
MI.insert(I, MCOperand::CreateReg(InITBlock ? 0 : ARM::CPSR));
return;
}
}
MI.insert(I, MCOperand::CreateReg(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.
MCDisassembler::DecodeStatus
ThumbDisassembler::AddThumbPredicate(MCInst &MI) const {
MCDisassembler::DecodeStatus S = Success;
// A few instructions actually have predicates encoded in them. Don't
// try to overwrite it if we're seeing one of those.
switch (MI.getOpcode()) {
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 (ITBlock.instrInITBlock())
S = SoftFail;
else
return 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())
S = SoftFail;
break;
default:
break;
}
// If we're in an IT block, base the predicate on that. Otherwise,
// assume a predicate of AL.
unsigned CC;
CC = ITBlock.getITCC();
if (CC == 0xF)
CC = ARMCC::AL;
if (ITBlock.instrInITBlock())
ITBlock.advanceITState();
const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
MCInst::iterator I = MI.begin();
for (unsigned i = 0; i < NumOps; ++i, ++I) {
if (I == MI.end()) break;
if (OpInfo[i].isPredicate()) {
I = MI.insert(I, MCOperand::CreateImm(CC));
++I;
if (CC == ARMCC::AL)
MI.insert(I, MCOperand::CreateReg(0));
else
MI.insert(I, MCOperand::CreateReg(ARM::CPSR));
return S;
}
}
I = MI.insert(I, MCOperand::CreateImm(CC));
++I;
if (CC == ARMCC::AL)
MI.insert(I, MCOperand::CreateReg(0));
else
MI.insert(I, MCOperand::CreateReg(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.
void ThumbDisassembler::UpdateThumbVFPPredicate(MCInst &MI) const {
unsigned CC;
CC = ITBlock.getITCC();
if (ITBlock.instrInITBlock())
ITBlock.advanceITState();
const MCOperandInfo *OpInfo = ARMInsts[MI.getOpcode()].OpInfo;
MCInst::iterator I = MI.begin();
unsigned short NumOps = ARMInsts[MI.getOpcode()].NumOperands;
for (unsigned i = 0; i < NumOps; ++i, ++I) {
if (OpInfo[i].isPredicate() ) {
I->setImm(CC);
++I;
if (CC == ARMCC::AL)
I->setReg(0);
else
I->setReg(ARM::CPSR);
return;
}
}
}
DecodeStatus ThumbDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
const MemoryObject &Region,
uint64_t Address,
raw_ostream &os,
raw_ostream &cs) const {
CommentStream = &cs;
uint8_t bytes[4];
assert((STI.getFeatureBits() & ARM::ModeThumb) &&
"Asked to disassemble in Thumb mode but Subtarget is in ARM mode!");
// We want to read exactly 2 bytes of data.
if (Region.readBytes(Address, 2, bytes) == -1) {
Size = 0;
return MCDisassembler::Fail;
}
uint16_t insn16 = (bytes[1] << 8) | bytes[0];
DecodeStatus result = decodeInstruction(DecoderTableThumb16, MI, insn16,
Address, this, STI);
if (result != MCDisassembler::Fail) {
Size = 2;
Check(result, AddThumbPredicate(MI));
return result;
}
MI.clear();
result = decodeInstruction(DecoderTableThumbSBit16, MI, insn16,
Address, this, STI);
if (result) {
Size = 2;
bool InITBlock = ITBlock.instrInITBlock();
Check(result, AddThumbPredicate(MI));
AddThumb1SBit(MI, InITBlock);
return result;
}
MI.clear();
result = decodeInstruction(DecoderTableThumb216, MI, insn16,
Address, this, STI);
if (result != MCDisassembler::Fail) {
Size = 2;
// Nested IT blocks are UNPREDICTABLE. Must be checked before we add
// the Thumb predicate.
if (MI.getOpcode() == ARM::t2IT && ITBlock.instrInITBlock())
result = MCDisassembler::SoftFail;
Check(result, AddThumbPredicate(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 (MI.getOpcode() == ARM::t2IT) {
unsigned Firstcond = MI.getOperand(0).getImm();
unsigned Mask = MI.getOperand(1).getImm();
ITBlock.setITState(Firstcond, Mask);
}
return result;
}
// We want to read exactly 4 bytes of data.
if (Region.readBytes(Address, 4, bytes) == -1) {
Size = 0;
return MCDisassembler::Fail;
}
uint32_t insn32 = (bytes[3] << 8) |
(bytes[2] << 0) |
(bytes[1] << 24) |
(bytes[0] << 16);
MI.clear();
result = decodeInstruction(DecoderTableThumb32, MI, insn32, Address,
this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
bool InITBlock = ITBlock.instrInITBlock();
Check(result, AddThumbPredicate(MI));
AddThumb1SBit(MI, InITBlock);
return result;
}
MI.clear();
result = decodeInstruction(DecoderTableThumb232, MI, insn32, Address,
this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
Check(result, AddThumbPredicate(MI));
return result;
}
if (fieldFromInstruction(insn32, 28, 4) == 0xE) {
MI.clear();
result = decodeInstruction(DecoderTableVFP32, MI, insn32, Address, this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
UpdateThumbVFPPredicate(MI);
return result;
}
}
MI.clear();
result = decodeInstruction(DecoderTableVFPV832, MI, insn32, Address, this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
return result;
}
if (fieldFromInstruction(insn32, 28, 4) == 0xE) {
MI.clear();
result = decodeInstruction(DecoderTableNEONDup32, MI, insn32, Address,
this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
Check(result, AddThumbPredicate(MI));
return result;
}
}
if (fieldFromInstruction(insn32, 24, 8) == 0xF9) {
MI.clear();
uint32_t NEONLdStInsn = insn32;
NEONLdStInsn &= 0xF0FFFFFF;
NEONLdStInsn |= 0x04000000;
result = decodeInstruction(DecoderTableNEONLoadStore32, MI, NEONLdStInsn,
Address, this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
Check(result, AddThumbPredicate(MI));
return result;
}
}
if (fieldFromInstruction(insn32, 24, 4) == 0xF) {
MI.clear();
uint32_t 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(DecoderTableNEONData32, MI, NEONDataInsn,
Address, this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
Check(result, AddThumbPredicate(MI));
return result;
}
MI.clear();
uint32_t 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(DecoderTablev8Crypto32, MI, NEONCryptoInsn,
Address, this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
return result;
}
MI.clear();
uint32_t NEONv8Insn = insn32;
NEONv8Insn &= 0xF3FFFFFF; // Clear bits 27-26
result = decodeInstruction(DecoderTablev8NEON32, MI, NEONv8Insn, Address,
this, STI);
if (result != MCDisassembler::Fail) {
Size = 4;
return result;
}
}
MI.clear();
Size = 0;
return MCDisassembler::Fail;
}
extern "C" void LLVMInitializeARMDisassembler() {
TargetRegistry::RegisterMCDisassembler(TheARMLETarget,
createARMDisassembler);
TargetRegistry::RegisterMCDisassembler(TheARMBETarget,
createARMDisassembler);
TargetRegistry::RegisterMCDisassembler(TheThumbLETarget,
createThumbDisassembler);
TargetRegistry::RegisterMCDisassembler(TheThumbBETarget,
createThumbDisassembler);
}
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) {
if (RegNo > 15)
return MCDisassembler::Fail;
unsigned Register = GPRDecoderTable[RegNo];
Inst.addOperand(MCOperand::CreateReg(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)
{
Inst.addOperand(MCOperand::CreateReg(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) {
DecodeStatus S = MCDisassembler::Success;
if (RegNo > 13)
return MCDisassembler::Fail;
if ((RegNo & 1) || RegNo == 0xe)
S = MCDisassembler::SoftFail;
unsigned RegisterPair = GPRPairDecoderTable[RegNo/2];
Inst.addOperand(MCOperand::CreateReg(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;
}
Inst.addOperand(MCOperand::CreateReg(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) {
if (RegNo > 31)
return MCDisassembler::Fail;
unsigned Register = SPRDecoderTable[RegNo];
Inst.addOperand(MCOperand::CreateReg(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) {
if (RegNo > 31)
return MCDisassembler::Fail;
unsigned Register = DPRDecoderTable[RegNo];
Inst.addOperand(MCOperand::CreateReg(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) {
if (RegNo > 31 || (RegNo & 1) != 0)
return MCDisassembler::Fail;
RegNo >>= 1;
unsigned Register = QPRDecoderTable[RegNo];
Inst.addOperand(MCOperand::CreateReg(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) {
if (RegNo > 30)
return MCDisassembler::Fail;
unsigned Register = DPairDecoderTable[RegNo];
Inst.addOperand(MCOperand::CreateReg(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) {
if (RegNo > 29)
return MCDisassembler::Fail;
unsigned Register = DPairSpacedDecoderTable[RegNo];
Inst.addOperand(MCOperand::CreateReg(Register));
return MCDisassembler::Success;
}
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 (Inst.getOpcode() == ARM::tBcc && Val == 0xE)
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(Val));
if (Val == ARMCC::AL) {
Inst.addOperand(MCOperand::CreateReg(0));
} else
Inst.addOperand(MCOperand::CreateReg(ARM::CPSR));
return MCDisassembler::Success;
}
static DecodeStatus DecodeCCOutOperand(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
if (Val)
Inst.addOperand(MCOperand::CreateReg(ARM::CPSR));
else
Inst.addOperand(MCOperand::CreateReg(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));
Inst.addOperand(MCOperand::CreateImm(rot_imm));
return MCDisassembler::Success;
}
static DecodeStatus DecodeSORegImmOperand(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rm = fieldFromInstruction(Val, 0, 4);
unsigned type = fieldFromInstruction(Val, 5, 2);
unsigned imm = fieldFromInstruction(Val, 7, 5);
// Register-immediate
if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
ARM_AM::ShiftOpc 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;
unsigned Op = Shift | (imm << 3);
Inst.addOperand(MCOperand::CreateImm(Op));
return S;
}
static DecodeStatus DecodeSORegRegOperand(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rm = fieldFromInstruction(Val, 0, 4);
unsigned type = fieldFromInstruction(Val, 5, 2);
unsigned Rs = fieldFromInstruction(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;
ARM_AM::ShiftOpc 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;
}
Inst.addOperand(MCOperand::CreateImm(Shift));
return S;
}
static DecodeStatus DecodeRegListOperand(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
bool NeedDisjointWriteback = false;
unsigned WritebackReg = 0;
switch (Inst.getOpcode()) {
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 = Inst.getOperand(0).getReg();
break;
}
// Empty register lists are not allowed.
if (Val == 0) return MCDisassembler::Fail;
for (unsigned 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 == Inst.end()[-1].getReg())
Check(S, MCDisassembler::SoftFail);
}
}
return S;
}
static DecodeStatus DecodeSPRRegListOperand(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Vd = fieldFromInstruction(Val, 8, 5);
unsigned regs = fieldFromInstruction(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 = std::max( 1u, regs);
S = MCDisassembler::SoftFail;
}
if (!Check(S, DecodeSPRRegisterClass(Inst, Vd, Address, Decoder)))
return MCDisassembler::Fail;
for (unsigned 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 Vd = fieldFromInstruction(Val, 8, 5);
unsigned regs = fieldFromInstruction(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 = std::max( 1u, regs);
regs = std::min(16u, regs);
S = MCDisassembler::SoftFail;
}
if (!Check(S, DecodeDPRRegisterClass(Inst, Vd, Address, Decoder)))
return MCDisassembler::Fail;
for (unsigned 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(Val, 5, 5);
unsigned lsb = fieldFromInstruction(Val, 0, 5);
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;
}
uint32_t msb_mask = 0xFFFFFFFF;
if (msb != 31) msb_mask = (1U << (msb+1)) - 1;
uint32_t lsb_mask = (1U << lsb) - 1;
Inst.addOperand(MCOperand::CreateImm(~(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(Insn, 28, 4);
unsigned CRd = fieldFromInstruction(Insn, 12, 4);
unsigned coproc = fieldFromInstruction(Insn, 8, 4);
unsigned imm = fieldFromInstruction(Insn, 0, 8);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned U = fieldFromInstruction(Insn, 23, 1);
switch (Inst.getOpcode()) {
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;
}
uint64_t featureBits = ((const MCDisassembler*)Decoder)->getSubtargetInfo()
.getFeatureBits();
if ((featureBits & ARM::HasV8Ops) && (coproc != 14))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(coproc));
Inst.addOperand(MCOperand::CreateImm(CRd));
if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
return MCDisassembler::Fail;
switch (Inst.getOpcode()) {
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, imm);
Inst.addOperand(MCOperand::CreateImm(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].
Inst.addOperand(MCOperand::CreateImm(imm));
break;
}
switch (Inst.getOpcode()) {
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;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned imm = fieldFromInstruction(Insn, 0, 12);
unsigned pred = fieldFromInstruction(Insn, 28, 4);
unsigned reg = fieldFromInstruction(Insn, 25, 1);
unsigned P = fieldFromInstruction(Insn, 24, 1);
unsigned W = fieldFromInstruction(Insn, 21, 1);
// On stores, the writeback operand precedes Rt.
switch (Inst.getOpcode()) {
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 (Inst.getOpcode()) {
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;
ARM_AM::AddrOpc Op = ARM_AM::add;
if (!fieldFromInstruction(Insn, 23, 1))
Op = ARM_AM::sub;
bool writeback = (P == 0) || (W == 1);
unsigned idx_mode = 0;
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;
ARM_AM::ShiftOpc Opc = ARM_AM::lsl;
switch( fieldFromInstruction(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;
}
unsigned amt = fieldFromInstruction(Insn, 7, 5);
if (Opc == ARM_AM::ror && amt == 0)
Opc = ARM_AM::rrx;
unsigned imm = ARM_AM::getAM2Opc(Op, amt, Opc, idx_mode);
Inst.addOperand(MCOperand::CreateImm(imm));
} else {
Inst.addOperand(MCOperand::CreateReg(0));
unsigned tmp = ARM_AM::getAM2Opc(Op, imm, ARM_AM::lsl, idx_mode);
Inst.addOperand(MCOperand::CreateImm(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;
unsigned Rn = fieldFromInstruction(Val, 13, 4);
unsigned Rm = fieldFromInstruction(Val, 0, 4);
unsigned type = fieldFromInstruction(Val, 5, 2);
unsigned imm = fieldFromInstruction(Val, 7, 5);
unsigned U = fieldFromInstruction(Val, 12, 1);
ARM_AM::ShiftOpc 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;
unsigned shift;
if (U)
shift = ARM_AM::getAM2Opc(ARM_AM::add, imm, ShOp);
else
shift = ARM_AM::getAM2Opc(ARM_AM::sub, imm, ShOp);
Inst.addOperand(MCOperand::CreateImm(shift));
return S;
}
static DecodeStatus
DecodeAddrMode3Instruction(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned type = fieldFromInstruction(Insn, 22, 1);
unsigned imm = fieldFromInstruction(Insn, 8, 4);
unsigned U = ((~fieldFromInstruction(Insn, 23, 1)) & 1) << 8;
unsigned pred = fieldFromInstruction(Insn, 28, 4);
unsigned W = fieldFromInstruction(Insn, 21, 1);
unsigned P = fieldFromInstruction(Insn, 24, 1);
unsigned Rt2 = Rt + 1;
bool writeback = (W == 1) | (P == 0);
// For {LD,ST}RD, Rt must be even, else undefined.
switch (Inst.getOpcode()) {
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 (Inst.getOpcode()) {
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(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 (Inst.getOpcode()) {
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 (Inst.getOpcode()) {
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 (Inst.getOpcode()) {
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) {
Inst.addOperand(MCOperand::CreateReg(0));
Inst.addOperand(MCOperand::CreateImm(U | (imm << 4) | Rm));
} else {
if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(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(Insn, 16, 4);
unsigned mode = fieldFromInstruction(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;
}
Inst.addOperand(MCOperand::CreateImm(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(Insn, 12, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned pred = fieldFromInstruction(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(Insn, 16, 4);
unsigned pred = fieldFromInstruction(Insn, 28, 4);
unsigned reglist = fieldFromInstruction(Insn, 0, 16);
if (pred == 0xF) {
// Ambiguous with RFE and SRS
switch (Inst.getOpcode()) {
case ARM::LDMDA:
Inst.setOpcode(ARM::RFEDA);
break;
case ARM::LDMDA_UPD:
Inst.setOpcode(ARM::RFEDA_UPD);
break;
case ARM::LDMDB:
Inst.setOpcode(ARM::RFEDB);
break;
case ARM::LDMDB_UPD:
Inst.setOpcode(ARM::RFEDB_UPD);
break;
case ARM::LDMIA:
Inst.setOpcode(ARM::RFEIA);
break;
case ARM::LDMIA_UPD:
Inst.setOpcode(ARM::RFEIA_UPD);
break;
case ARM::LDMIB:
Inst.setOpcode(ARM::RFEIB);
break;
case ARM::LDMIB_UPD:
Inst.setOpcode(ARM::RFEIB_UPD);
break;
case ARM::STMDA:
Inst.setOpcode(ARM::SRSDA);
break;
case ARM::STMDA_UPD:
Inst.setOpcode(ARM::SRSDA_UPD);
break;
case ARM::STMDB:
Inst.setOpcode(ARM::SRSDB);
break;
case ARM::STMDB_UPD:
Inst.setOpcode(ARM::SRSDB_UPD);
break;
case ARM::STMIA:
Inst.setOpcode(ARM::SRSIA);
break;
case ARM::STMIA_UPD:
Inst.setOpcode(ARM::SRSIA_UPD);
break;
case ARM::STMIB:
Inst.setOpcode(ARM::SRSIB);
break;
case ARM::STMIB_UPD:
Inst.setOpcode(ARM::SRSIB_UPD);
break;
default:
return MCDisassembler::Fail;
}
// For stores (which become SRS's, the only operand is the mode.
if (fieldFromInstruction(Insn, 20, 1) == 0) {
// Check SRS encoding constraints
if (!(fieldFromInstruction(Insn, 22, 1) == 1 &&
fieldFromInstruction(Insn, 20, 1) == 0))
return MCDisassembler::Fail;
Inst.addOperand(
MCOperand::CreateImm(fieldFromInstruction(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(Insn, 18, 2);
unsigned M = fieldFromInstruction(Insn, 17, 1);
unsigned iflags = fieldFromInstruction(Insn, 6, 3);
unsigned mode = fieldFromInstruction(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(Insn, 5, 1) != 0 ||
fieldFromInstruction(Insn, 16, 1) != 0 ||
fieldFromInstruction(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) {
Inst.setOpcode(ARM::CPS3p);
Inst.addOperand(MCOperand::CreateImm(imod));
Inst.addOperand(MCOperand::CreateImm(iflags));
Inst.addOperand(MCOperand::CreateImm(mode));
} else if (imod && !M) {
Inst.setOpcode(ARM::CPS2p);
Inst.addOperand(MCOperand::CreateImm(imod));
Inst.addOperand(MCOperand::CreateImm(iflags));
if (mode) S = MCDisassembler::SoftFail;
} else if (!imod && M) {
Inst.setOpcode(ARM::CPS1p);
Inst.addOperand(MCOperand::CreateImm(mode));
if (iflags) S = MCDisassembler::SoftFail;
} else {
// imod == '00' && M == '0' --> UNPREDICTABLE
Inst.setOpcode(ARM::CPS1p);
Inst.addOperand(MCOperand::CreateImm(mode));
S = MCDisassembler::SoftFail;
}
return S;
}
static DecodeStatus DecodeT2CPSInstruction(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
unsigned imod = fieldFromInstruction(Insn, 9, 2);
unsigned M = fieldFromInstruction(Insn, 8, 1);
unsigned iflags = fieldFromInstruction(Insn, 5, 3);
unsigned mode = fieldFromInstruction(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) {
Inst.setOpcode(ARM::t2CPS3p);
Inst.addOperand(MCOperand::CreateImm(imod));
Inst.addOperand(MCOperand::CreateImm(iflags));
Inst.addOperand(MCOperand::CreateImm(mode));
} else if (imod && !M) {
Inst.setOpcode(ARM::t2CPS2p);
Inst.addOperand(MCOperand::CreateImm(imod));
Inst.addOperand(MCOperand::CreateImm(iflags));
if (mode) S = MCDisassembler::SoftFail;
} else if (!imod && M) {
Inst.setOpcode(ARM::t2CPS1p);
Inst.addOperand(MCOperand::CreateImm(mode));
if (iflags) S = MCDisassembler::SoftFail;
} else {
// imod == '00' && M == '0' --> this is a HINT instruction
int imm = fieldFromInstruction(Insn, 0, 8);
// HINT are defined only for immediate in [0..4]
if(imm > 4) return MCDisassembler::Fail;
Inst.setOpcode(ARM::t2HINT);
Inst.addOperand(MCOperand::CreateImm(imm));
}
return S;
}
static DecodeStatus DecodeT2MOVTWInstruction(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rd = fieldFromInstruction(Insn, 8, 4);
unsigned imm = 0;
imm |= (fieldFromInstruction(Insn, 0, 8) << 0);
imm |= (fieldFromInstruction(Insn, 12, 3) << 8);
imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
imm |= (fieldFromInstruction(Insn, 26, 1) << 11);
if (Inst.getOpcode() == ARM::t2MOVTi16)
if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
return MCDisassembler::Fail;
if (!Check(S, DecoderGPRRegisterClass(Inst, Rd, Address, Decoder)))
return MCDisassembler::Fail;
if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(imm));
return S;
}
static DecodeStatus DecodeArmMOVTWInstruction(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rd = fieldFromInstruction(Insn, 12, 4);
unsigned pred = fieldFromInstruction(Insn, 28, 4);
unsigned imm = 0;
imm |= (fieldFromInstruction(Insn, 0, 12) << 0);
imm |= (fieldFromInstruction(Insn, 16, 4) << 12);
if (Inst.getOpcode() == ARM::MOVTi16)
if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
return MCDisassembler::Fail;
if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rd, Address, Decoder)))
return MCDisassembler::Fail;
if (!tryAddingSymbolicOperand(Address, imm, false, 4, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(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(Insn, 16, 4);
unsigned Rn = fieldFromInstruction(Insn, 0, 4);
unsigned Rm = fieldFromInstruction(Insn, 8, 4);
unsigned Ra = fieldFromInstruction(Insn, 12, 4);
unsigned pred = fieldFromInstruction(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(Val, 12, 1);
unsigned imm = fieldFromInstruction(Val, 0, 12);
unsigned Rn = fieldFromInstruction(Val, 13, 4);
if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
return MCDisassembler::Fail;
if (!add) imm *= -1;
if (imm == 0 && !add) imm = INT32_MIN;
Inst.addOperand(MCOperand::CreateImm(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(Val, 9, 4);
unsigned U = fieldFromInstruction(Val, 8, 1);
unsigned imm = fieldFromInstruction(Val, 0, 8);
if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
return MCDisassembler::Fail;
if (U)
Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::add, imm)));
else
Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::sub, 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(Insn, 26, 1);
unsigned J1 = fieldFromInstruction(Insn, 13, 1);
unsigned J2 = fieldFromInstruction(Insn, 11, 1);
unsigned I1 = !(J1 ^ S);
unsigned I2 = !(J2 ^ S);
unsigned imm10 = fieldFromInstruction(Insn, 16, 10);
unsigned imm11 = fieldFromInstruction(Insn, 0, 11);
unsigned tmp = (S << 23) | (I1 << 22) | (I2 << 21) | (imm10 << 11) | imm11;
int imm32 = SignExtend32<25>(tmp << 1);
if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
true, 4, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(imm32));
return Status;
}
static DecodeStatus
DecodeBranchImmInstruction(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned pred = fieldFromInstruction(Insn, 28, 4);
unsigned imm = fieldFromInstruction(Insn, 0, 24) << 2;
if (pred == 0xF) {
Inst.setOpcode(ARM::BLXi);
imm |= fieldFromInstruction(Insn, 24, 1) << 1;
if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
true, 4, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm)));
return S;
}
if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<26>(imm) + 8,
true, 4, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(SignExtend32<26>(imm)));
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(Val, 0, 4);
unsigned align = fieldFromInstruction(Val, 4, 2);
if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
if (!align)
Inst.addOperand(MCOperand::CreateImm(0));
else
Inst.addOperand(MCOperand::CreateImm(4 << align));
return S;
}
static DecodeStatus DecodeVLDInstruction(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned wb = fieldFromInstruction(Insn, 16, 4);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
// First output register
switch (Inst.getOpcode()) {
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 (Inst.getOpcode()) {
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(Inst.getOpcode()) {
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 (Inst.getOpcode()) {
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 (Inst.getOpcode()) {
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:
Inst.addOperand(MCOperand::CreateImm(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 (Inst.getOpcode()) {
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) {
Inst.addOperand(MCOperand::CreateReg(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 type = fieldFromInstruction(Insn, 8, 4);
unsigned align = fieldFromInstruction(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;
unsigned load = fieldFromInstruction(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 size = fieldFromInstruction(Insn, 6, 2);
if (size == 3) return MCDisassembler::Fail;
unsigned type = fieldFromInstruction(Insn, 8, 4);
unsigned align = fieldFromInstruction(Insn, 4, 2);
if (type == 8 && align == 3) return MCDisassembler::Fail;
if (type == 9 && align == 3) return MCDisassembler::Fail;
unsigned load = fieldFromInstruction(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 size = fieldFromInstruction(Insn, 6, 2);
if (size == 3) return MCDisassembler::Fail;
unsigned align = fieldFromInstruction(Insn, 4, 2);
if (align & 2) return MCDisassembler::Fail;
unsigned load = fieldFromInstruction(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 size = fieldFromInstruction(Insn, 6, 2);
if (size == 3) return MCDisassembler::Fail;
unsigned load = fieldFromInstruction(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 Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned wb = fieldFromInstruction(Insn, 16, 4);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
Rn |= fieldFromInstruction(Insn, 4, 2) << 4;
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
// Writeback Operand
switch (Inst.getOpcode()) {
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;
Inst.addOperand(MCOperand::CreateImm(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 (Inst.getOpcode()) {
default:
if (Rm == 0xD)
Inst.addOperand(MCOperand::CreateReg(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 (Inst.getOpcode()) {
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 (Inst.getOpcode()) {
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 (Inst.getOpcode()) {
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 (Inst.getOpcode()) {
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 Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned align = fieldFromInstruction(Insn, 4, 1);
unsigned size = fieldFromInstruction(Insn, 6, 2);
if (size == 0 && align == 1)
return MCDisassembler::Fail;
align *= (1 << size);
switch (Inst.getOpcode()) {
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;
Inst.addOperand(MCOperand::CreateImm(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 Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned align = fieldFromInstruction(Insn, 4, 1);
unsigned size = 1 << fieldFromInstruction(Insn, 6, 2);
align *= 2*size;
switch (Inst.getOpcode()) {
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)
Inst.addOperand(MCOperand::CreateImm(0));
if (!Check(S, DecodeGPRRegisterClass(Inst, Rn, Address, Decoder)))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(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 Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned inc = fieldFromInstruction(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;
Inst.addOperand(MCOperand::CreateImm(0));
if (Rm == 0xD)
Inst.addOperand(MCOperand::CreateReg(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 Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned size = fieldFromInstruction(Insn, 6, 2);
unsigned inc = fieldFromInstruction(Insn, 5, 1) + 1;
unsigned align = fieldFromInstruction(Insn, 4, 1);
if (size == 0x3) {
if (align == 0)
return MCDisassembler::Fail;
size = 4;
align = 16;
} else {
if (size == 2) {
size = 1 << size;
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;
Inst.addOperand(MCOperand::CreateImm(align));
if (Rm == 0xD)
Inst.addOperand(MCOperand::CreateReg(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 Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned imm = fieldFromInstruction(Insn, 0, 4);
imm |= fieldFromInstruction(Insn, 16, 3) << 4;
imm |= fieldFromInstruction(Insn, 24, 1) << 7;
imm |= fieldFromInstruction(Insn, 8, 4) << 8;
imm |= fieldFromInstruction(Insn, 5, 1) << 12;
unsigned Q = fieldFromInstruction(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;
}
Inst.addOperand(MCOperand::CreateImm(imm));
switch (Inst.getOpcode()) {
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 Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
unsigned size = fieldFromInstruction(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;
Inst.addOperand(MCOperand::CreateImm(8 << size));
return S;
}
static DecodeStatus DecodeShiftRight8Imm(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
Inst.addOperand(MCOperand::CreateImm(8 - Val));
return MCDisassembler::Success;
}
static DecodeStatus DecodeShiftRight16Imm(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
Inst.addOperand(MCOperand::CreateImm(16 - Val));
return MCDisassembler::Success;
}
static DecodeStatus DecodeShiftRight32Imm(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
Inst.addOperand(MCOperand::CreateImm(32 - Val));
return MCDisassembler::Success;
}
static DecodeStatus DecodeShiftRight64Imm(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
Inst.addOperand(MCOperand::CreateImm(64 - Val));
return MCDisassembler::Success;
}
static DecodeStatus DecodeTBLInstruction(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
Rn |= fieldFromInstruction(Insn, 7, 1) << 4;
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
Rm |= fieldFromInstruction(Insn, 5, 1) << 4;
unsigned op = fieldFromInstruction(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 (Inst.getOpcode()) {
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(Insn, 8, 3);
unsigned imm = fieldFromInstruction(Insn, 0, 8);
if (!Check(S, DecodetGPRRegisterClass(Inst, dst, Address, Decoder)))
return MCDisassembler::Fail;
switch(Inst.getOpcode()) {
default:
return MCDisassembler::Fail;
case ARM::tADR:
break; // tADR does not explicitly represent the PC as an operand.
case ARM::tADDrSPi:
Inst.addOperand(MCOperand::CreateReg(ARM::SP));
break;
}
Inst.addOperand(MCOperand::CreateImm(imm));
return S;
}
static DecodeStatus DecodeThumbBROperand(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<12>(Val<<1) + 4,
true, 2, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(SignExtend32<12>(Val << 1)));
return MCDisassembler::Success;
}
static DecodeStatus DecodeT2BROperand(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<21>(Val) + 4,
true, 4, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(SignExtend32<21>(Val)));
return MCDisassembler::Success;
}
static DecodeStatus DecodeThumbCmpBROperand(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
if (!tryAddingSymbolicOperand(Address, Address + (Val<<1) + 4,
true, 2, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(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(Val, 0, 3);
unsigned Rm = fieldFromInstruction(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(Val, 0, 3);
unsigned imm = fieldFromInstruction(Val, 3, 5);
if (!Check(S, DecodetGPRRegisterClass(Inst, Rn, Address, Decoder)))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(imm));
return S;
}
static DecodeStatus DecodeThumbAddrModePC(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
unsigned imm = Val << 2;
Inst.addOperand(MCOperand::CreateImm(imm));
tryAddingPcLoadReferenceComment(Address, (Address & ~2u) + imm + 4, Decoder);
return MCDisassembler::Success;
}
static DecodeStatus DecodeThumbAddrModeSP(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
Inst.addOperand(MCOperand::CreateReg(ARM::SP));
Inst.addOperand(MCOperand::CreateImm(Val));
return MCDisassembler::Success;
}
static DecodeStatus DecodeT2AddrModeSOReg(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rn = fieldFromInstruction(Val, 6, 4);
unsigned Rm = fieldFromInstruction(Val, 2, 4);
unsigned imm = fieldFromInstruction(Val, 0, 2);
// Thumb stores cannot use PC as dest register.
switch (Inst.getOpcode()) {
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;
Inst.addOperand(MCOperand::CreateImm(imm));
return S;
}
static DecodeStatus DecodeT2LoadShift(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
if (Rn == 15) {
switch (Inst.getOpcode()) {
case ARM::t2LDRBs:
Inst.setOpcode(ARM::t2LDRBpci);
break;
case ARM::t2LDRHs:
Inst.setOpcode(ARM::t2LDRHpci);
break;
case ARM::t2LDRSHs:
Inst.setOpcode(ARM::t2LDRSHpci);
break;
case ARM::t2LDRSBs:
Inst.setOpcode(ARM::t2LDRSBpci);
break;
case ARM::t2LDRs:
Inst.setOpcode(ARM::t2LDRpci);
break;
case ARM::t2PLDs:
Inst.setOpcode(ARM::t2PLDpci);
break;
case ARM::t2PLIs:
Inst.setOpcode(ARM::t2PLIpci);
break;
default:
return MCDisassembler::Fail;
}
return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
}
if (Rt == 15) {
switch (Inst.getOpcode()) {
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.
Inst.setOpcode(ARM::t2PLDWs);
break;
default:
break;
}
}
switch (Inst.getOpcode()) {
case ARM::t2PLDs:
case ARM::t2PLDWs:
case ARM::t2PLIs:
break;
default:
if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
return MCDisassembler::Fail;
}
unsigned addrmode = fieldFromInstruction(Insn, 4, 2);
addrmode |= fieldFromInstruction(Insn, 0, 4) << 2;
addrmode |= fieldFromInstruction(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(Insn, 16, 4);
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned U = fieldFromInstruction(Insn, 9, 1);
unsigned imm = fieldFromInstruction(Insn, 0, 8);
imm |= (U << 8);
imm |= (Rn << 9);
if (Rn == 15) {
switch (Inst.getOpcode()) {
case ARM::t2LDRi8:
Inst.setOpcode(ARM::t2LDRpci);
break;
case ARM::t2LDRBi8:
Inst.setOpcode(ARM::t2LDRBpci);
break;
case ARM::t2LDRSBi8:
Inst.setOpcode(ARM::t2LDRSBpci);
break;
case ARM::t2LDRHi8:
Inst.setOpcode(ARM::t2LDRHpci);
break;
case ARM::t2LDRSHi8:
Inst.setOpcode(ARM::t2LDRSHpci);
break;
case ARM::t2PLDi8:
Inst.setOpcode(ARM::t2PLDpci);
break;
case ARM::t2PLIi8:
Inst.setOpcode(ARM::t2PLIpci);
break;
default:
return MCDisassembler::Fail;
}
return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
}
if (Rt == 15) {
switch (Inst.getOpcode()) {
case ARM::t2LDRSHi8:
return MCDisassembler::Fail;
default:
break;
}
}
switch (Inst.getOpcode()) {
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(Insn, 16, 4);
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned imm = fieldFromInstruction(Insn, 0, 12);
imm |= (Rn << 13);
if (Rn == 15) {
switch (Inst.getOpcode()) {
case ARM::t2LDRi12:
Inst.setOpcode(ARM::t2LDRpci);
break;
case ARM::t2LDRHi12:
Inst.setOpcode(ARM::t2LDRHpci);
break;
case ARM::t2LDRSHi12:
Inst.setOpcode(ARM::t2LDRSHpci);
break;
case ARM::t2LDRBi12:
Inst.setOpcode(ARM::t2LDRBpci);
break;
case ARM::t2LDRSBi12:
Inst.setOpcode(ARM::t2LDRSBpci);
break;
case ARM::t2PLDi12:
Inst.setOpcode(ARM::t2PLDpci);
break;
case ARM::t2PLIi12:
Inst.setOpcode(ARM::t2PLIpci);
break;
default:
return MCDisassembler::Fail;
}
return DecodeT2LoadLabel(Inst, Insn, Address, Decoder);
}
if (Rt == 15) {
switch (Inst.getOpcode()) {
case ARM::t2LDRSHi12:
return MCDisassembler::Fail;
case ARM::t2LDRHi12:
Inst.setOpcode(ARM::t2PLDi12);
break;
default:
break;
}
}
switch (Inst.getOpcode()) {
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(Insn, 16, 4);
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned imm = fieldFromInstruction(Insn, 0, 8);
imm |= (Rn << 9);
if (Rn == 15) {
switch (Inst.getOpcode()) {
case ARM::t2LDRT:
Inst.setOpcode(ARM::t2LDRpci);
break;
case ARM::t2LDRBT:
Inst.setOpcode(ARM::t2LDRBpci);
break;
case ARM::t2LDRHT:
Inst.setOpcode(ARM::t2LDRHpci);
break;
case ARM::t2LDRSBT:
Inst.setOpcode(ARM::t2LDRSBpci);
break;
case ARM::t2LDRSHT:
Inst.setOpcode(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(Insn, 12, 4);
unsigned U = fieldFromInstruction(Insn, 23, 1);
int imm = fieldFromInstruction(Insn, 0, 12);
if (Rt == 15) {
switch (Inst.getOpcode()) {
case ARM::t2LDRBpci:
case ARM::t2LDRHpci:
Inst.setOpcode(ARM::t2PLDpci);
break;
case ARM::t2LDRSBpci:
Inst.setOpcode(ARM::t2PLIpci);
break;
case ARM::t2LDRSHpci:
return MCDisassembler::Fail;
default:
break;
}
}
switch(Inst.getOpcode()) {
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;
}
Inst.addOperand(MCOperand::CreateImm(imm));
return S;
}
static DecodeStatus DecodeT2Imm8S4(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
if (Val == 0)
Inst.addOperand(MCOperand::CreateImm(INT32_MIN));
else {
int imm = Val & 0xFF;
if (!(Val & 0x100)) imm *= -1;
Inst.addOperand(MCOperand::CreateImm(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(Val, 9, 4);
unsigned imm = fieldFromInstruction(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(Val, 8, 4);
unsigned imm = fieldFromInstruction(Val, 0, 8);
if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rn, Address, Decoder)))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(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;
Inst.addOperand(MCOperand::CreateImm(imm));
return MCDisassembler::Success;
}
static DecodeStatus DecodeT2AddrModeImm8(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rn = fieldFromInstruction(Val, 9, 4);
unsigned imm = fieldFromInstruction(Val, 0, 9);
// Thumb stores cannot use PC as dest register.
switch (Inst.getOpcode()) {
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 (Inst.getOpcode()) {
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 Rt = fieldFromInstruction(Insn, 12, 4);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned addr = fieldFromInstruction(Insn, 0, 8);
addr |= fieldFromInstruction(Insn, 9, 1) << 8;
addr |= Rn << 9;
unsigned load = fieldFromInstruction(Insn, 20, 1);
if (Rn == 15) {
switch (Inst.getOpcode()) {
case ARM::t2LDR_PRE:
case ARM::t2LDR_POST:
Inst.setOpcode(ARM::t2LDRpci);
break;
case ARM::t2LDRB_PRE:
case ARM::t2LDRB_POST:
Inst.setOpcode(ARM::t2LDRBpci);
break;
case ARM::t2LDRH_PRE:
case ARM::t2LDRH_POST:
Inst.setOpcode(ARM::t2LDRHpci);
break;
case ARM::t2LDRSB_PRE:
case ARM::t2LDRSB_POST:
if (Rt == 15)
Inst.setOpcode(ARM::t2PLIpci);
else
Inst.setOpcode(ARM::t2LDRSBpci);
break;
case ARM::t2LDRSH_PRE:
case ARM::t2LDRSH_POST:
Inst.setOpcode(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(Val, 13, 4);
unsigned imm = fieldFromInstruction(Val, 0, 12);
// Thumb stores cannot use PC as dest register.
switch (Inst.getOpcode()) {
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;
Inst.addOperand(MCOperand::CreateImm(imm));
return S;
}
static DecodeStatus DecodeThumbAddSPImm(MCInst &Inst, uint16_t Insn,
uint64_t Address, const void *Decoder) {
unsigned imm = fieldFromInstruction(Insn, 0, 7);
Inst.addOperand(MCOperand::CreateReg(ARM::SP));
Inst.addOperand(MCOperand::CreateReg(ARM::SP));
Inst.addOperand(MCOperand::CreateImm(imm));
return MCDisassembler::Success;
}
static DecodeStatus DecodeThumbAddSPReg(MCInst &Inst, uint16_t Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
if (Inst.getOpcode() == ARM::tADDrSP) {
unsigned Rdm = fieldFromInstruction(Insn, 0, 3);
Rdm |= fieldFromInstruction(Insn, 7, 1) << 3;
if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder)))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateReg(ARM::SP));
if (!Check(S, DecodeGPRRegisterClass(Inst, Rdm, Address, Decoder)))
return MCDisassembler::Fail;
} else if (Inst.getOpcode() == ARM::tADDspr) {
unsigned Rm = fieldFromInstruction(Insn, 3, 4);
Inst.addOperand(MCOperand::CreateReg(ARM::SP));
Inst.addOperand(MCOperand::CreateReg(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(Insn, 4, 1) | 0x2;
unsigned flags = fieldFromInstruction(Insn, 0, 3);
Inst.addOperand(MCOperand::CreateImm(imod));
Inst.addOperand(MCOperand::CreateImm(flags));
return MCDisassembler::Success;
}
static DecodeStatus DecodePostIdxReg(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned add = fieldFromInstruction(Insn, 4, 1);
if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(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<25>(tmp << 1);
if (!tryAddingSymbolicOperand(Address,
(Address & ~2u) + imm32 + 4,
true, 4, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(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;
uint64_t featureBits = ((const MCDisassembler*)Decoder)->getSubtargetInfo()
.getFeatureBits();
if ((featureBits & ARM::HasV8Ops) && !(Val == 14 || Val == 15))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(Val));
return MCDisassembler::Success;
}
static DecodeStatus
DecodeThumbTableBranch(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(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 pred = fieldFromInstruction(Insn, 22, 4);
if (pred == 0xE || pred == 0xF) {
unsigned opc = fieldFromInstruction(Insn, 4, 28);
switch (opc) {
default:
return MCDisassembler::Fail;
case 0xf3bf8f4:
Inst.setOpcode(ARM::t2DSB);
break;
case 0xf3bf8f5:
Inst.setOpcode(ARM::t2DMB);
break;
case 0xf3bf8f6:
Inst.setOpcode(ARM::t2ISB);
break;
}
unsigned imm = fieldFromInstruction(Insn, 0, 4);
return DecodeMemBarrierOption(Inst, imm, Address, Decoder);
}
unsigned brtarget = fieldFromInstruction(Insn, 0, 11) << 1;
brtarget |= fieldFromInstruction(Insn, 11, 1) << 19;
brtarget |= fieldFromInstruction(Insn, 13, 1) << 18;
brtarget |= fieldFromInstruction(Insn, 16, 6) << 12;
brtarget |= fieldFromInstruction(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(Val, 10, 2);
if (ctrl == 0) {
unsigned byte = fieldFromInstruction(Val, 8, 2);
unsigned imm = fieldFromInstruction(Val, 0, 8);
switch (byte) {
case 0:
Inst.addOperand(MCOperand::CreateImm(imm));
break;
case 1:
Inst.addOperand(MCOperand::CreateImm((imm << 16) | imm));
break;
case 2:
Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 8)));
break;
case 3:
Inst.addOperand(MCOperand::CreateImm((imm << 24) | (imm << 16) |
(imm << 8) | imm));
break;
}
} else {
unsigned unrot = fieldFromInstruction(Val, 0, 7) | 0x80;
unsigned rot = fieldFromInstruction(Val, 7, 5);
unsigned imm = (unrot >> rot) | (unrot << ((32-rot)&31));
Inst.addOperand(MCOperand::CreateImm(imm));
}
return MCDisassembler::Success;
}
static DecodeStatus
DecodeThumbBCCTargetOperand(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder){
if (!tryAddingSymbolicOperand(Address, Address + SignExtend32<9>(Val<<1) + 4,
true, 2, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(SignExtend32<9>(Val << 1)));
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<25>(tmp << 1);
if (!tryAddingSymbolicOperand(Address, Address + imm32 + 4,
true, 4, Inst, Decoder))
Inst.addOperand(MCOperand::CreateImm(imm32));
return MCDisassembler::Success;
}
static DecodeStatus DecodeMemBarrierOption(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
if (Val & ~0xf)
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(Val));
return MCDisassembler::Success;
}
static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
if (Val & ~0xf)
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(Val));
return MCDisassembler::Success;
}
static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
if (!Val) return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(Val));
return MCDisassembler::Success;
}
static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned pred = fieldFromInstruction(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(Insn, 12, 4);
unsigned Rt = fieldFromInstruction(Insn, 0, 4);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned pred = fieldFromInstruction(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 Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned imm = fieldFromInstruction(Insn, 0, 12);
imm |= fieldFromInstruction(Insn, 16, 4) << 13;
imm |= fieldFromInstruction(Insn, 23, 1) << 12;
unsigned pred = fieldFromInstruction(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 Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned imm = fieldFromInstruction(Insn, 0, 12);
imm |= fieldFromInstruction(Insn, 16, 4) << 13;
imm |= fieldFromInstruction(Insn, 23, 1) << 12;
unsigned pred = fieldFromInstruction(Insn, 28, 4);
unsigned Rm = fieldFromInstruction(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 Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned imm = fieldFromInstruction(Insn, 0, 12);
imm |= fieldFromInstruction(Insn, 16, 4) << 13;
imm |= fieldFromInstruction(Insn, 23, 1) << 12;
unsigned pred = fieldFromInstruction(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 Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned imm = fieldFromInstruction(Insn, 0, 12);
imm |= fieldFromInstruction(Insn, 16, 4) << 13;
imm |= fieldFromInstruction(Insn, 23, 1) << 12;
unsigned pred = fieldFromInstruction(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 Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned size = fieldFromInstruction(Insn, 10, 2);
unsigned align = 0;
unsigned index = 0;
switch (size) {
default:
return MCDisassembler::Fail;
case 0:
if (fieldFromInstruction(Insn, 4, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 5, 3);
break;
case 1:
if (fieldFromInstruction(Insn, 5, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 6, 2);
if (fieldFromInstruction(Insn, 4, 1))
align = 2;
break;
case 2:
if (fieldFromInstruction(Insn, 6, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 7, 1);
switch (fieldFromInstruction(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;
Inst.addOperand(MCOperand::CreateImm(align));
if (Rm != 0xF) {
if (Rm != 0xD) {
if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
} else
Inst.addOperand(MCOperand::CreateReg(0));
}
if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(index));
return S;
}
static DecodeStatus DecodeVST1LN(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned size = fieldFromInstruction(Insn, 10, 2);
unsigned align = 0;
unsigned index = 0;
switch (size) {
default:
return MCDisassembler::Fail;
case 0:
if (fieldFromInstruction(Insn, 4, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 5, 3);
break;
case 1:
if (fieldFromInstruction(Insn, 5, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 6, 2);
if (fieldFromInstruction(Insn, 4, 1))
align = 2;
break;
case 2:
if (fieldFromInstruction(Insn, 6, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 7, 1);
switch (fieldFromInstruction(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;
Inst.addOperand(MCOperand::CreateImm(align));
if (Rm != 0xF) {
if (Rm != 0xD) {
if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
} else
Inst.addOperand(MCOperand::CreateReg(0));
}
if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(index));
return S;
}
static DecodeStatus DecodeVLD2LN(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned size = fieldFromInstruction(Insn, 10, 2);
unsigned align = 0;
unsigned index = 0;
unsigned inc = 1;
switch (size) {
default:
return MCDisassembler::Fail;
case 0:
index = fieldFromInstruction(Insn, 5, 3);
if (fieldFromInstruction(Insn, 4, 1))
align = 2;
break;
case 1:
index = fieldFromInstruction(Insn, 6, 2);
if (fieldFromInstruction(Insn, 4, 1))
align = 4;
if (fieldFromInstruction(Insn, 5, 1))
inc = 2;
break;
case 2:
if (fieldFromInstruction(Insn, 5, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 7, 1);
if (fieldFromInstruction(Insn, 4, 1) != 0)
align = 8;
if (fieldFromInstruction(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;
Inst.addOperand(MCOperand::CreateImm(align));
if (Rm != 0xF) {
if (Rm != 0xD) {
if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
} else
Inst.addOperand(MCOperand::CreateReg(0));
}
if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
return MCDisassembler::Fail;
if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(index));
return S;
}
static DecodeStatus DecodeVST2LN(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned size = fieldFromInstruction(Insn, 10, 2);
unsigned align = 0;
unsigned index = 0;
unsigned inc = 1;
switch (size) {
default:
return MCDisassembler::Fail;
case 0:
index = fieldFromInstruction(Insn, 5, 3);
if (fieldFromInstruction(Insn, 4, 1))
align = 2;
break;
case 1:
index = fieldFromInstruction(Insn, 6, 2);
if (fieldFromInstruction(Insn, 4, 1))
align = 4;
if (fieldFromInstruction(Insn, 5, 1))
inc = 2;
break;
case 2:
if (fieldFromInstruction(Insn, 5, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 7, 1);
if (fieldFromInstruction(Insn, 4, 1) != 0)
align = 8;
if (fieldFromInstruction(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;
Inst.addOperand(MCOperand::CreateImm(align));
if (Rm != 0xF) {
if (Rm != 0xD) {
if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
} else
Inst.addOperand(MCOperand::CreateReg(0));
}
if (!Check(S, DecodeDPRRegisterClass(Inst, Rd, Address, Decoder)))
return MCDisassembler::Fail;
if (!Check(S, DecodeDPRRegisterClass(Inst, Rd+inc, Address, Decoder)))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(index));
return S;
}
static DecodeStatus DecodeVLD3LN(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned size = fieldFromInstruction(Insn, 10, 2);
unsigned align = 0;
unsigned index = 0;
unsigned inc = 1;
switch (size) {
default:
return MCDisassembler::Fail;
case 0:
if (fieldFromInstruction(Insn, 4, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 5, 3);
break;
case 1:
if (fieldFromInstruction(Insn, 4, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 6, 2);
if (fieldFromInstruction(Insn, 5, 1))
inc = 2;
break;
case 2:
if (fieldFromInstruction(Insn, 4, 2))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 7, 1);
if (fieldFromInstruction(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;
Inst.addOperand(MCOperand::CreateImm(align));
if (Rm != 0xF) {
if (Rm != 0xD) {
if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
} else
Inst.addOperand(MCOperand::CreateReg(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;
Inst.addOperand(MCOperand::CreateImm(index));
return S;
}
static DecodeStatus DecodeVST3LN(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned size = fieldFromInstruction(Insn, 10, 2);
unsigned align = 0;
unsigned index = 0;
unsigned inc = 1;
switch (size) {
default:
return MCDisassembler::Fail;
case 0:
if (fieldFromInstruction(Insn, 4, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 5, 3);
break;
case 1:
if (fieldFromInstruction(Insn, 4, 1))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 6, 2);
if (fieldFromInstruction(Insn, 5, 1))
inc = 2;
break;
case 2:
if (fieldFromInstruction(Insn, 4, 2))
return MCDisassembler::Fail; // UNDEFINED
index = fieldFromInstruction(Insn, 7, 1);
if (fieldFromInstruction(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;
Inst.addOperand(MCOperand::CreateImm(align));
if (Rm != 0xF) {
if (Rm != 0xD) {
if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
} else
Inst.addOperand(MCOperand::CreateReg(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;
Inst.addOperand(MCOperand::CreateImm(index));
return S;
}
static DecodeStatus DecodeVLD4LN(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned size = fieldFromInstruction(Insn, 10, 2);
unsigned align = 0;
unsigned index = 0;
unsigned inc = 1;
switch (size) {
default:
return MCDisassembler::Fail;
case 0:
if (fieldFromInstruction(Insn, 4, 1))
align = 4;
index = fieldFromInstruction(Insn, 5, 3);
break;
case 1:
if (fieldFromInstruction(Insn, 4, 1))
align = 8;
index = fieldFromInstruction(Insn, 6, 2);
if (fieldFromInstruction(Insn, 5, 1))
inc = 2;
break;
case 2:
switch (fieldFromInstruction(Insn, 4, 2)) {
case 0:
align = 0; break;
case 3:
return MCDisassembler::Fail;
default:
align = 4 << fieldFromInstruction(Insn, 4, 2); break;
}
index = fieldFromInstruction(Insn, 7, 1);
if (fieldFromInstruction(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;
Inst.addOperand(MCOperand::CreateImm(align));
if (Rm != 0xF) {
if (Rm != 0xD) {
if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
} else
Inst.addOperand(MCOperand::CreateReg(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;
Inst.addOperand(MCOperand::CreateImm(index));
return S;
}
static DecodeStatus DecodeVST4LN(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 0, 4);
unsigned Rd = fieldFromInstruction(Insn, 12, 4);
Rd |= fieldFromInstruction(Insn, 22, 1) << 4;
unsigned size = fieldFromInstruction(Insn, 10, 2);
unsigned align = 0;
unsigned index = 0;
unsigned inc = 1;
switch (size) {
default:
return MCDisassembler::Fail;
case 0:
if (fieldFromInstruction(Insn, 4, 1))
align = 4;
index = fieldFromInstruction(Insn, 5, 3);
break;
case 1:
if (fieldFromInstruction(Insn, 4, 1))
align = 8;
index = fieldFromInstruction(Insn, 6, 2);
if (fieldFromInstruction(Insn, 5, 1))
inc = 2;
break;
case 2:
switch (fieldFromInstruction(Insn, 4, 2)) {
case 0:
align = 0; break;
case 3:
return MCDisassembler::Fail;
default:
align = 4 << fieldFromInstruction(Insn, 4, 2); break;
}
index = fieldFromInstruction(Insn, 7, 1);
if (fieldFromInstruction(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;
Inst.addOperand(MCOperand::CreateImm(align));
if (Rm != 0xF) {
if (Rm != 0xD) {
if (!Check(S, DecodeGPRRegisterClass(Inst, Rm, Address, Decoder)))
return MCDisassembler::Fail;
} else
Inst.addOperand(MCOperand::CreateReg(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;
Inst.addOperand(MCOperand::CreateImm(index));
return S;
}
static DecodeStatus DecodeVMOVSRR(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 5, 1);
unsigned pred = fieldFromInstruction(Insn, 28, 4);
Rm |= fieldFromInstruction(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(Insn, 12, 4);
unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
unsigned Rm = fieldFromInstruction(Insn, 5, 1);
unsigned pred = fieldFromInstruction(Insn, 28, 4);
Rm |= fieldFromInstruction(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(Insn, 4, 4);
unsigned mask = fieldFromInstruction(Insn, 0, 4);
if (pred == 0xF) {
pred = 0xE;
S = MCDisassembler::SoftFail;
}
if (mask == 0x0)
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(pred));
Inst.addOperand(MCOperand::CreateImm(mask));
return S;
}
static DecodeStatus
DecodeT2LDRDPreInstruction(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned Rt2 = fieldFromInstruction(Insn, 8, 4);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned addr = fieldFromInstruction(Insn, 0, 8);
unsigned W = fieldFromInstruction(Insn, 21, 1);
unsigned U = fieldFromInstruction(Insn, 23, 1);
unsigned P = fieldFromInstruction(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(Insn, 12, 4);
unsigned Rt2 = fieldFromInstruction(Insn, 8, 4);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned addr = fieldFromInstruction(Insn, 0, 8);
unsigned W = fieldFromInstruction(Insn, 21, 1);
unsigned U = fieldFromInstruction(Insn, 23, 1);
unsigned P = fieldFromInstruction(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 sign1 = fieldFromInstruction(Insn, 21, 1);
unsigned sign2 = fieldFromInstruction(Insn, 23, 1);
if (sign1 != sign2) return MCDisassembler::Fail;
unsigned Val = fieldFromInstruction(Insn, 0, 8);
Val |= fieldFromInstruction(Insn, 12, 3) << 8;
Val |= fieldFromInstruction(Insn, 26, 1) << 11;
Val |= sign1 << 12;
Inst.addOperand(MCOperand::CreateImm(SignExtend32<13>(Val)));
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;
Inst.addOperand(MCOperand::CreateImm(Val));
return S;
}
static DecodeStatus DecodeSwap(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
unsigned Rt = fieldFromInstruction(Insn, 12, 4);
unsigned Rt2 = fieldFromInstruction(Insn, 0, 4);
unsigned Rn = fieldFromInstruction(Insn, 16, 4);
unsigned pred = fieldFromInstruction(Insn, 28, 4);
if (pred == 0xF)
return DecodeCPSInstruction(Inst, Insn, Address, Decoder);
DecodeStatus 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) {
unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0);
Vd |= (fieldFromInstruction(Insn, 22, 1) << 4);
unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0);
Vm |= (fieldFromInstruction(Insn, 5, 1) << 4);
unsigned imm = fieldFromInstruction(Insn, 16, 6);
unsigned cmode = fieldFromInstruction(Insn, 8, 4);
unsigned op = fieldFromInstruction(Insn, 5, 1);
DecodeStatus S = MCDisassembler::Success;
// VMOVv2f32 is ambiguous with these decodings.
if (!(imm & 0x38) && cmode == 0xF) {
if (op == 1) return MCDisassembler::Fail;
Inst.setOpcode(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;
Inst.addOperand(MCOperand::CreateImm(64 - imm));
return S;
}
static DecodeStatus DecodeVCVTQ(MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
unsigned Vd = (fieldFromInstruction(Insn, 12, 4) << 0);
Vd |= (fieldFromInstruction(Insn, 22, 1) << 4);
unsigned Vm = (fieldFromInstruction(Insn, 0, 4) << 0);
Vm |= (fieldFromInstruction(Insn, 5, 1) << 4);
unsigned imm = fieldFromInstruction(Insn, 16, 6);
unsigned cmode = fieldFromInstruction(Insn, 8, 4);
unsigned op = fieldFromInstruction(Insn, 5, 1);
DecodeStatus S = MCDisassembler::Success;
// VMOVv4f32 is ambiguous with these decodings.
if (!(imm & 0x38) && cmode == 0xF) {
if (op == 1) return MCDisassembler::Fail;
Inst.setOpcode(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;
Inst.addOperand(MCOperand::CreateImm(64 - imm));
return S;
}
static DecodeStatus DecodeLDR(MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rn = fieldFromInstruction(Val, 16, 4);
unsigned Rt = fieldFromInstruction(Val, 12, 4);
unsigned Rm = fieldFromInstruction(Val, 0, 4);
Rm |= (fieldFromInstruction(Val, 23, 1) << 4);
unsigned Cond = fieldFromInstruction(Val, 28, 4);
if (fieldFromInstruction(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(llvm::MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned CRm = fieldFromInstruction(Val, 0, 4);
unsigned opc1 = fieldFromInstruction(Val, 4, 4);
unsigned cop = fieldFromInstruction(Val, 8, 4);
unsigned Rt = fieldFromInstruction(Val, 12, 4);
unsigned Rt2 = fieldFromInstruction(Val, 16, 4);
if ((cop & ~0x1) == 0xa)
return MCDisassembler::Fail;
if (Rt == Rt2)
S = MCDisassembler::SoftFail;
Inst.addOperand(MCOperand::CreateImm(cop));
Inst.addOperand(MCOperand::CreateImm(opc1));
if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt, Address, Decoder)))
return MCDisassembler::Fail;
if (!Check(S, DecodeGPRnopcRegisterClass(Inst, Rt2, Address, Decoder)))
return MCDisassembler::Fail;
Inst.addOperand(MCOperand::CreateImm(CRm));
return S;
}