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91cdab6916
llvm-mirror/lib/Target/X86/Disassembler/X86Disassembler.cpp
Lang Hames 91cdab6916 [MC] Require an MCContext when constructing an MCDisassembler. 
This patch re-introduces the MCContext member that was removed from
MCDisassembler in r206063, and requires that an MCContext be passed in at
MCDisassembler construction time. (Previously the MCContext member had been
initialized in an ad-hoc fashion after construction). The MCCContext member
can be used by MCDisassembler sub-classes to construct constant or
target-specific MCExprs.

This patch updates disassemblers for in-tree targets, and provides the
MCRegisterInfo instance that some disassemblers were using through the
MCContext (previously those backends were constructing their own
MCRegisterInfo instances).

llvm-svn: 206241
2014-04-15 04:40:56 +00:00

817 lines
28 KiB
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//===-- X86Disassembler.cpp - Disassembler for x86 and x86_64 -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is part of the X86 Disassembler.
// It contains code to translate the data produced by the decoder into
// MCInsts.
// Documentation for the disassembler can be found in X86Disassembler.h.
//
//===----------------------------------------------------------------------===//
#include "X86Disassembler.h"
#include "X86DisassemblerDecoder.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MemoryObject.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#define GET_REGINFO_ENUM
#include "X86GenRegisterInfo.inc"
#define GET_INSTRINFO_ENUM
#include "X86GenInstrInfo.inc"
#define GET_SUBTARGETINFO_ENUM
#include "X86GenSubtargetInfo.inc"
using namespace llvm;
using namespace llvm::X86Disassembler;
void x86DisassemblerDebug(const char *file,
unsigned line,
const char *s) {
dbgs() << file << ":" << line << ": " << s;
}
const char *x86DisassemblerGetInstrName(unsigned Opcode, const void *mii) {
const MCInstrInfo *MII = static_cast<const MCInstrInfo *>(mii);
return MII->getName(Opcode);
}
#define debug(s) DEBUG(x86DisassemblerDebug(__FILE__, __LINE__, s));
namespace llvm {
// Fill-ins to make the compiler happy. These constants are never actually
// assigned; they are just filler to make an automatically-generated switch
// statement work.
namespace X86 {
enum {
BX_SI = 500,
BX_DI = 501,
BP_SI = 502,
BP_DI = 503,
sib = 504,
sib64 = 505
};
}
extern Target TheX86_32Target, TheX86_64Target;
}
static bool translateInstruction(MCInst &target,
InternalInstruction &source,
const MCDisassembler *Dis);
X86GenericDisassembler::X86GenericDisassembler(
const MCSubtargetInfo &STI,
MCContext &Ctx,
std::unique_ptr<const MCInstrInfo> MII)
: MCDisassembler(STI, Ctx), MII(std::move(MII)) {
switch (STI.getFeatureBits() &
(X86::Mode16Bit | X86::Mode32Bit | X86::Mode64Bit)) {
case X86::Mode16Bit:
fMode = MODE_16BIT;
break;
case X86::Mode32Bit:
fMode = MODE_32BIT;
break;
case X86::Mode64Bit:
fMode = MODE_64BIT;
break;
default:
llvm_unreachable("Invalid CPU mode");
}
}
/// regionReader - a callback function that wraps the readByte method from
/// MemoryObject.
///
/// @param arg - The generic callback parameter. In this case, this should
/// be a pointer to a MemoryObject.
/// @param byte - A pointer to the byte to be read.
/// @param address - The address to be read.
static int regionReader(const void* arg, uint8_t* byte, uint64_t address) {
const MemoryObject* region = static_cast<const MemoryObject*>(arg);
return region->readByte(address, byte);
}
/// logger - a callback function that wraps the operator<< method from
/// raw_ostream.
///
/// @param arg - The generic callback parameter. This should be a pointe
/// to a raw_ostream.
/// @param log - A string to be logged. logger() adds a newline.
static void logger(void* arg, const char* log) {
if (!arg)
return;
raw_ostream &vStream = *(static_cast<raw_ostream*>(arg));
vStream << log << "\n";
}
//
// Public interface for the disassembler
//
MCDisassembler::DecodeStatus
X86GenericDisassembler::getInstruction(MCInst &instr,
uint64_t &size,
const MemoryObject &region,
uint64_t address,
raw_ostream &vStream,
raw_ostream &cStream) const {
CommentStream = &cStream;
InternalInstruction internalInstr;
dlog_t loggerFn = logger;
if (&vStream == &nulls())
loggerFn = 0; // Disable logging completely if it's going to nulls().
int ret = decodeInstruction(&internalInstr,
regionReader,
(const void*)&region,
loggerFn,
(void*)&vStream,
(const void*)MII.get(),
address,
fMode);
if (ret) {
size = internalInstr.readerCursor - address;
return Fail;
}
else {
size = internalInstr.length;
return (!translateInstruction(instr, internalInstr, this)) ?
Success : Fail;
}
}
//
// Private code that translates from struct InternalInstructions to MCInsts.
//
/// translateRegister - Translates an internal register to the appropriate LLVM
/// register, and appends it as an operand to an MCInst.
///
/// @param mcInst - The MCInst to append to.
/// @param reg - The Reg to append.
static void translateRegister(MCInst &mcInst, Reg reg) {
#define ENTRY(x) X86::x,
uint8_t llvmRegnums[] = {
ALL_REGS
0
};
#undef ENTRY
uint8_t llvmRegnum = llvmRegnums[reg];
mcInst.addOperand(MCOperand::CreateReg(llvmRegnum));
}
/// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the
/// immediate Value in the MCInst.
///
/// @param Value - The immediate Value, has had any PC adjustment made by
/// the caller.
/// @param isBranch - If the instruction is a branch instruction
/// @param Address - The starting address of the instruction
/// @param Offset - The byte offset to this immediate in the instruction
/// @param Width - The byte width of this immediate in the instruction
///
/// If the getOpInfo() function was set when setupForSymbolicDisassembly() was
/// called then that function is called to get any symbolic information for the
/// immediate in the instruction using the Address, Offset and Width. 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 immediate Value
/// is done and if a symbol is found an MCExpr is created with that, else
/// an MCExpr with the immediate Value is created. This function returns true
/// if it adds an operand to the MCInst and false otherwise.
static bool tryAddingSymbolicOperand(int64_t Value, bool isBranch,
uint64_t Address, uint64_t Offset,
uint64_t Width, MCInst &MI,
const MCDisassembler *Dis) {
return Dis->tryAddingSymbolicOperand(MI, Value, Address, isBranch,
Offset, Width);
}
/// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being
/// referenced by a load instruction with the base register that is the rip.
/// These can often be addresses in a literal pool. The Address of the
/// instruction and its immediate Value are used to determine the address
/// being referenced in the literal pool entry. The SymbolLookUp call back will
/// return a pointer to a literal 'C' string if the referenced address is an
/// address into a section with 'C' string literals.
static void tryAddingPcLoadReferenceComment(uint64_t Address, uint64_t Value,
const void *Decoder) {
const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
Dis->tryAddingPcLoadReferenceComment(Value, Address);
}
static const uint8_t segmentRegnums[SEG_OVERRIDE_max] = {
0, // SEG_OVERRIDE_NONE
X86::CS,
X86::SS,
X86::DS,
X86::ES,
X86::FS,
X86::GS
};
/// translateSrcIndex - Appends a source index operand to an MCInst.
///
/// @param mcInst - The MCInst to append to.
/// @param insn - The internal instruction.
static bool translateSrcIndex(MCInst &mcInst, InternalInstruction &insn) {
unsigned baseRegNo;
if (insn.mode == MODE_64BIT)
baseRegNo = insn.prefixPresent[0x67] ? X86::ESI : X86::RSI;
else if (insn.mode == MODE_32BIT)
baseRegNo = insn.prefixPresent[0x67] ? X86::SI : X86::ESI;
else {
assert(insn.mode == MODE_16BIT);
baseRegNo = insn.prefixPresent[0x67] ? X86::ESI : X86::SI;
}
MCOperand baseReg = MCOperand::CreateReg(baseRegNo);
mcInst.addOperand(baseReg);
MCOperand segmentReg;
segmentReg = MCOperand::CreateReg(segmentRegnums[insn.segmentOverride]);
mcInst.addOperand(segmentReg);
return false;
}
/// translateDstIndex - Appends a destination index operand to an MCInst.
///
/// @param mcInst - The MCInst to append to.
/// @param insn - The internal instruction.
static bool translateDstIndex(MCInst &mcInst, InternalInstruction &insn) {
unsigned baseRegNo;
if (insn.mode == MODE_64BIT)
baseRegNo = insn.prefixPresent[0x67] ? X86::EDI : X86::RDI;
else if (insn.mode == MODE_32BIT)
baseRegNo = insn.prefixPresent[0x67] ? X86::DI : X86::EDI;
else {
assert(insn.mode == MODE_16BIT);
baseRegNo = insn.prefixPresent[0x67] ? X86::EDI : X86::DI;
}
MCOperand baseReg = MCOperand::CreateReg(baseRegNo);
mcInst.addOperand(baseReg);
return false;
}
/// translateImmediate - Appends an immediate operand to an MCInst.
///
/// @param mcInst - The MCInst to append to.
/// @param immediate - The immediate value to append.
/// @param operand - The operand, as stored in the descriptor table.
/// @param insn - The internal instruction.
static void translateImmediate(MCInst &mcInst, uint64_t immediate,
const OperandSpecifier &operand,
InternalInstruction &insn,
const MCDisassembler *Dis) {
// Sign-extend the immediate if necessary.
OperandType type = (OperandType)operand.type;
bool isBranch = false;
uint64_t pcrel = 0;
if (type == TYPE_RELv) {
isBranch = true;
pcrel = insn.startLocation +
insn.immediateOffset + insn.immediateSize;
switch (insn.displacementSize) {
default:
break;
case 1:
if(immediate & 0x80)
immediate |= ~(0xffull);
break;
case 2:
if(immediate & 0x8000)
immediate |= ~(0xffffull);
break;
case 4:
if(immediate & 0x80000000)
immediate |= ~(0xffffffffull);
break;
case 8:
break;
}
}
// By default sign-extend all X86 immediates based on their encoding.
else if (type == TYPE_IMM8 || type == TYPE_IMM16 || type == TYPE_IMM32 ||
type == TYPE_IMM64) {
uint32_t Opcode = mcInst.getOpcode();
switch (operand.encoding) {
default:
break;
case ENCODING_IB:
// Special case those X86 instructions that use the imm8 as a set of
// bits, bit count, etc. and are not sign-extend.
if (Opcode != X86::BLENDPSrri && Opcode != X86::BLENDPDrri &&
Opcode != X86::PBLENDWrri && Opcode != X86::MPSADBWrri &&
Opcode != X86::DPPSrri && Opcode != X86::DPPDrri &&
Opcode != X86::INSERTPSrr && Opcode != X86::VBLENDPSYrri &&
Opcode != X86::VBLENDPSYrmi && Opcode != X86::VBLENDPDYrri &&
Opcode != X86::VBLENDPDYrmi && Opcode != X86::VPBLENDWrri &&
Opcode != X86::VMPSADBWrri && Opcode != X86::VDPPSYrri &&
Opcode != X86::VDPPSYrmi && Opcode != X86::VDPPDrri &&
Opcode != X86::VINSERTPSrr)
if(immediate & 0x80)
immediate |= ~(0xffull);
break;
case ENCODING_IW:
if(immediate & 0x8000)
immediate |= ~(0xffffull);
break;
case ENCODING_ID:
if(immediate & 0x80000000)
immediate |= ~(0xffffffffull);
break;
case ENCODING_IO:
break;
}
}
switch (type) {
case TYPE_XMM32:
case TYPE_XMM64:
case TYPE_XMM128:
mcInst.addOperand(MCOperand::CreateReg(X86::XMM0 + (immediate >> 4)));
return;
case TYPE_XMM256:
mcInst.addOperand(MCOperand::CreateReg(X86::YMM0 + (immediate >> 4)));
return;
case TYPE_XMM512:
mcInst.addOperand(MCOperand::CreateReg(X86::ZMM0 + (immediate >> 4)));
return;
case TYPE_REL8:
isBranch = true;
pcrel = insn.startLocation + insn.immediateOffset + insn.immediateSize;
if(immediate & 0x80)
immediate |= ~(0xffull);
break;
case TYPE_REL32:
case TYPE_REL64:
isBranch = true;
pcrel = insn.startLocation + insn.immediateOffset + insn.immediateSize;
if(immediate & 0x80000000)
immediate |= ~(0xffffffffull);
break;
default:
// operand is 64 bits wide. Do nothing.
break;
}
if(!tryAddingSymbolicOperand(immediate + pcrel, isBranch, insn.startLocation,
insn.immediateOffset, insn.immediateSize,
mcInst, Dis))
mcInst.addOperand(MCOperand::CreateImm(immediate));
if (type == TYPE_MOFFS8 || type == TYPE_MOFFS16 ||
type == TYPE_MOFFS32 || type == TYPE_MOFFS64) {
MCOperand segmentReg;
segmentReg = MCOperand::CreateReg(segmentRegnums[insn.segmentOverride]);
mcInst.addOperand(segmentReg);
}
}
/// translateRMRegister - Translates a register stored in the R/M field of the
/// ModR/M byte to its LLVM equivalent and appends it to an MCInst.
/// @param mcInst - The MCInst to append to.
/// @param insn - The internal instruction to extract the R/M field
/// from.
/// @return - 0 on success; -1 otherwise
static bool translateRMRegister(MCInst &mcInst,
InternalInstruction &insn) {
if (insn.eaBase == EA_BASE_sib || insn.eaBase == EA_BASE_sib64) {
debug("A R/M register operand may not have a SIB byte");
return true;
}
switch (insn.eaBase) {
default:
debug("Unexpected EA base register");
return true;
case EA_BASE_NONE:
debug("EA_BASE_NONE for ModR/M base");
return true;
#define ENTRY(x) case EA_BASE_##x:
ALL_EA_BASES
#undef ENTRY
debug("A R/M register operand may not have a base; "
"the operand must be a register.");
return true;
#define ENTRY(x) \
case EA_REG_##x: \
mcInst.addOperand(MCOperand::CreateReg(X86::x)); break;
ALL_REGS
#undef ENTRY
}
return false;
}
/// translateRMMemory - Translates a memory operand stored in the Mod and R/M
/// fields of an internal instruction (and possibly its SIB byte) to a memory
/// operand in LLVM's format, and appends it to an MCInst.
///
/// @param mcInst - The MCInst to append to.
/// @param insn - The instruction to extract Mod, R/M, and SIB fields
/// from.
/// @return - 0 on success; nonzero otherwise
static bool translateRMMemory(MCInst &mcInst, InternalInstruction &insn,
const MCDisassembler *Dis) {
// Addresses in an MCInst are represented as five operands:
// 1. basereg (register) The R/M base, or (if there is a SIB) the
// SIB base
// 2. scaleamount (immediate) 1, or (if there is a SIB) the specified
// scale amount
// 3. indexreg (register) x86_registerNONE, or (if there is a SIB)
// the index (which is multiplied by the
// scale amount)
// 4. displacement (immediate) 0, or the displacement if there is one
// 5. segmentreg (register) x86_registerNONE for now, but could be set
// if we have segment overrides
MCOperand baseReg;
MCOperand scaleAmount;
MCOperand indexReg;
MCOperand displacement;
MCOperand segmentReg;
uint64_t pcrel = 0;
if (insn.eaBase == EA_BASE_sib || insn.eaBase == EA_BASE_sib64) {
if (insn.sibBase != SIB_BASE_NONE) {
switch (insn.sibBase) {
default:
debug("Unexpected sibBase");
return true;
#define ENTRY(x) \
case SIB_BASE_##x: \
baseReg = MCOperand::CreateReg(X86::x); break;
ALL_SIB_BASES
#undef ENTRY
}
} else {
baseReg = MCOperand::CreateReg(0);
}
// Check whether we are handling VSIB addressing mode for GATHER.
// If sibIndex was set to SIB_INDEX_NONE, index offset is 4 and
// we should use SIB_INDEX_XMM4|YMM4 for VSIB.
// I don't see a way to get the correct IndexReg in readSIB:
// We can tell whether it is VSIB or SIB after instruction ID is decoded,
// but instruction ID may not be decoded yet when calling readSIB.
uint32_t Opcode = mcInst.getOpcode();
bool IndexIs128 = (Opcode == X86::VGATHERDPDrm ||
Opcode == X86::VGATHERDPDYrm ||
Opcode == X86::VGATHERQPDrm ||
Opcode == X86::VGATHERDPSrm ||
Opcode == X86::VGATHERQPSrm ||
Opcode == X86::VPGATHERDQrm ||
Opcode == X86::VPGATHERDQYrm ||
Opcode == X86::VPGATHERQQrm ||
Opcode == X86::VPGATHERDDrm ||
Opcode == X86::VPGATHERQDrm);
bool IndexIs256 = (Opcode == X86::VGATHERQPDYrm ||
Opcode == X86::VGATHERDPSYrm ||
Opcode == X86::VGATHERQPSYrm ||
Opcode == X86::VGATHERDPDZrm ||
Opcode == X86::VPGATHERDQZrm ||
Opcode == X86::VPGATHERQQYrm ||
Opcode == X86::VPGATHERDDYrm ||
Opcode == X86::VPGATHERQDYrm);
bool IndexIs512 = (Opcode == X86::VGATHERQPDZrm ||
Opcode == X86::VGATHERDPSZrm ||
Opcode == X86::VGATHERQPSZrm ||
Opcode == X86::VPGATHERQQZrm ||
Opcode == X86::VPGATHERDDZrm ||
Opcode == X86::VPGATHERQDZrm);
if (IndexIs128 || IndexIs256 || IndexIs512) {
unsigned IndexOffset = insn.sibIndex -
(insn.addressSize == 8 ? SIB_INDEX_RAX:SIB_INDEX_EAX);
SIBIndex IndexBase = IndexIs512 ? SIB_INDEX_ZMM0 :
IndexIs256 ? SIB_INDEX_YMM0 : SIB_INDEX_XMM0;
insn.sibIndex = (SIBIndex)(IndexBase +
(insn.sibIndex == SIB_INDEX_NONE ? 4 : IndexOffset));
}
if (insn.sibIndex != SIB_INDEX_NONE) {
switch (insn.sibIndex) {
default:
debug("Unexpected sibIndex");
return true;
#define ENTRY(x) \
case SIB_INDEX_##x: \
indexReg = MCOperand::CreateReg(X86::x); break;
EA_BASES_32BIT
EA_BASES_64BIT
REGS_XMM
REGS_YMM
REGS_ZMM
#undef ENTRY
}
} else {
indexReg = MCOperand::CreateReg(0);
}
scaleAmount = MCOperand::CreateImm(insn.sibScale);
} else {
switch (insn.eaBase) {
case EA_BASE_NONE:
if (insn.eaDisplacement == EA_DISP_NONE) {
debug("EA_BASE_NONE and EA_DISP_NONE for ModR/M base");
return true;
}
if (insn.mode == MODE_64BIT){
pcrel = insn.startLocation +
insn.displacementOffset + insn.displacementSize;
tryAddingPcLoadReferenceComment(insn.startLocation +
insn.displacementOffset,
insn.displacement + pcrel, Dis);
baseReg = MCOperand::CreateReg(X86::RIP); // Section 2.2.1.6
}
else
baseReg = MCOperand::CreateReg(0);
indexReg = MCOperand::CreateReg(0);
break;
case EA_BASE_BX_SI:
baseReg = MCOperand::CreateReg(X86::BX);
indexReg = MCOperand::CreateReg(X86::SI);
break;
case EA_BASE_BX_DI:
baseReg = MCOperand::CreateReg(X86::BX);
indexReg = MCOperand::CreateReg(X86::DI);
break;
case EA_BASE_BP_SI:
baseReg = MCOperand::CreateReg(X86::BP);
indexReg = MCOperand::CreateReg(X86::SI);
break;
case EA_BASE_BP_DI:
baseReg = MCOperand::CreateReg(X86::BP);
indexReg = MCOperand::CreateReg(X86::DI);
break;
default:
indexReg = MCOperand::CreateReg(0);
switch (insn.eaBase) {
default:
debug("Unexpected eaBase");
return true;
// Here, we will use the fill-ins defined above. However,
// BX_SI, BX_DI, BP_SI, and BP_DI are all handled above and
// sib and sib64 were handled in the top-level if, so they're only
// placeholders to keep the compiler happy.
#define ENTRY(x) \
case EA_BASE_##x: \
baseReg = MCOperand::CreateReg(X86::x); break;
ALL_EA_BASES
#undef ENTRY
#define ENTRY(x) case EA_REG_##x:
ALL_REGS
#undef ENTRY
debug("A R/M memory operand may not be a register; "
"the base field must be a base.");
return true;
}
}
scaleAmount = MCOperand::CreateImm(1);
}
displacement = MCOperand::CreateImm(insn.displacement);
segmentReg = MCOperand::CreateReg(segmentRegnums[insn.segmentOverride]);
mcInst.addOperand(baseReg);
mcInst.addOperand(scaleAmount);
mcInst.addOperand(indexReg);
if(!tryAddingSymbolicOperand(insn.displacement + pcrel, false,
insn.startLocation, insn.displacementOffset,
insn.displacementSize, mcInst, Dis))
mcInst.addOperand(displacement);
mcInst.addOperand(segmentReg);
return false;
}
/// translateRM - Translates an operand stored in the R/M (and possibly SIB)
/// byte of an instruction to LLVM form, and appends it to an MCInst.
///
/// @param mcInst - The MCInst to append to.
/// @param operand - The operand, as stored in the descriptor table.
/// @param insn - The instruction to extract Mod, R/M, and SIB fields
/// from.
/// @return - 0 on success; nonzero otherwise
static bool translateRM(MCInst &mcInst, const OperandSpecifier &operand,
InternalInstruction &insn, const MCDisassembler *Dis) {
switch (operand.type) {
default:
debug("Unexpected type for a R/M operand");
return true;
case TYPE_R8:
case TYPE_R16:
case TYPE_R32:
case TYPE_R64:
case TYPE_Rv:
case TYPE_MM:
case TYPE_MM32:
case TYPE_MM64:
case TYPE_XMM:
case TYPE_XMM32:
case TYPE_XMM64:
case TYPE_XMM128:
case TYPE_XMM256:
case TYPE_XMM512:
case TYPE_VK1:
case TYPE_VK8:
case TYPE_VK16:
case TYPE_DEBUGREG:
case TYPE_CONTROLREG:
return translateRMRegister(mcInst, insn);
case TYPE_M:
case TYPE_M8:
case TYPE_M16:
case TYPE_M32:
case TYPE_M64:
case TYPE_M128:
case TYPE_M256:
case TYPE_M512:
case TYPE_Mv:
case TYPE_M32FP:
case TYPE_M64FP:
case TYPE_M80FP:
case TYPE_M16INT:
case TYPE_M32INT:
case TYPE_M64INT:
case TYPE_M1616:
case TYPE_M1632:
case TYPE_M1664:
case TYPE_LEA:
return translateRMMemory(mcInst, insn, Dis);
}
}
/// translateFPRegister - Translates a stack position on the FPU stack to its
/// LLVM form, and appends it to an MCInst.
///
/// @param mcInst - The MCInst to append to.
/// @param stackPos - The stack position to translate.
static void translateFPRegister(MCInst &mcInst,
uint8_t stackPos) {
mcInst.addOperand(MCOperand::CreateReg(X86::ST0 + stackPos));
}
/// translateMaskRegister - Translates a 3-bit mask register number to
/// LLVM form, and appends it to an MCInst.
///
/// @param mcInst - The MCInst to append to.
/// @param maskRegNum - Number of mask register from 0 to 7.
/// @return - false on success; true otherwise.
static bool translateMaskRegister(MCInst &mcInst,
uint8_t maskRegNum) {
if (maskRegNum >= 8) {
debug("Invalid mask register number");
return true;
}
mcInst.addOperand(MCOperand::CreateReg(X86::K0 + maskRegNum));
return false;
}
/// translateOperand - Translates an operand stored in an internal instruction
/// to LLVM's format and appends it to an MCInst.
///
/// @param mcInst - The MCInst to append to.
/// @param operand - The operand, as stored in the descriptor table.
/// @param insn - The internal instruction.
/// @return - false on success; true otherwise.
static bool translateOperand(MCInst &mcInst, const OperandSpecifier &operand,
InternalInstruction &insn,
const MCDisassembler *Dis) {
switch (operand.encoding) {
default:
debug("Unhandled operand encoding during translation");
return true;
case ENCODING_REG:
translateRegister(mcInst, insn.reg);
return false;
case ENCODING_WRITEMASK:
return translateMaskRegister(mcInst, insn.writemask);
case ENCODING_RM:
return translateRM(mcInst, operand, insn, Dis);
case ENCODING_CB:
case ENCODING_CW:
case ENCODING_CD:
case ENCODING_CP:
case ENCODING_CO:
case ENCODING_CT:
debug("Translation of code offsets isn't supported.");
return true;
case ENCODING_IB:
case ENCODING_IW:
case ENCODING_ID:
case ENCODING_IO:
case ENCODING_Iv:
case ENCODING_Ia:
translateImmediate(mcInst,
insn.immediates[insn.numImmediatesTranslated++],
operand,
insn,
Dis);
return false;
case ENCODING_SI:
return translateSrcIndex(mcInst, insn);
case ENCODING_DI:
return translateDstIndex(mcInst, insn);
case ENCODING_RB:
case ENCODING_RW:
case ENCODING_RD:
case ENCODING_RO:
case ENCODING_Rv:
translateRegister(mcInst, insn.opcodeRegister);
return false;
case ENCODING_FP:
translateFPRegister(mcInst, insn.modRM & 7);
return false;
case ENCODING_VVVV:
translateRegister(mcInst, insn.vvvv);
return false;
case ENCODING_DUP:
return translateOperand(mcInst, insn.operands[operand.type - TYPE_DUP0],
insn, Dis);
}
}
/// translateInstruction - Translates an internal instruction and all its
/// operands to an MCInst.
///
/// @param mcInst - The MCInst to populate with the instruction's data.
/// @param insn - The internal instruction.
/// @return - false on success; true otherwise.
static bool translateInstruction(MCInst &mcInst,
InternalInstruction &insn,
const MCDisassembler *Dis) {
if (!insn.spec) {
debug("Instruction has no specification");
return true;
}
mcInst.setOpcode(insn.instructionID);
// If when reading the prefix bytes we determined the overlapping 0xf2 or 0xf3
// prefix bytes should be disassembled as xrelease and xacquire then set the
// opcode to those instead of the rep and repne opcodes.
if (insn.xAcquireRelease) {
if(mcInst.getOpcode() == X86::REP_PREFIX)
mcInst.setOpcode(X86::XRELEASE_PREFIX);
else if(mcInst.getOpcode() == X86::REPNE_PREFIX)
mcInst.setOpcode(X86::XACQUIRE_PREFIX);
}
int index;
insn.numImmediatesTranslated = 0;
for (index = 0; index < X86_MAX_OPERANDS; ++index) {
if (insn.operands[index].encoding != ENCODING_NONE) {
if (translateOperand(mcInst, insn.operands[index], insn, Dis)) {
return true;
}
}
}
return false;
}
static MCDisassembler *createX86Disassembler(const Target &T,
const MCSubtargetInfo &STI,
MCContext &Ctx) {
std::unique_ptr<const MCInstrInfo> MII(T.createMCInstrInfo());
return new X86Disassembler::X86GenericDisassembler(STI, Ctx, std::move(MII));
}
extern "C" void LLVMInitializeX86Disassembler() {
// Register the disassembler.
TargetRegistry::RegisterMCDisassembler(TheX86_32Target,
createX86Disassembler);
TargetRegistry::RegisterMCDisassembler(TheX86_64Target,
createX86Disassembler);
}
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