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and MCSubtargetInfo. - Added methods to update subtarget features (used when targets automatically detect subtarget features or switch modes). - Teach X86Subtarget to update MCSubtargetInfo features bits since the MCSubtargetInfo layer can be shared with other modules. - These fixes .code 16 / .code 32 support since mode switch is updated in MCSubtargetInfo so MC code emitter can do the right thing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134884 91177308-0d34-0410-b5e6-96231b3b80d8
1048 lines
36 KiB
C++
1048 lines
36 KiB
C++
//===-- X86/X86MCCodeEmitter.cpp - Convert X86 code to machine code -------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the X86MCCodeEmitter class.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "mccodeemitter"
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#include "X86.h"
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#include "X86InstrInfo.h"
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#include "X86FixupKinds.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/raw_ostream.h"
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#define GET_SUBTARGETINFO_ENUM
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#include "X86GenSubtargetInfo.inc"
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using namespace llvm;
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namespace {
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class X86MCCodeEmitter : public MCCodeEmitter {
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X86MCCodeEmitter(const X86MCCodeEmitter &); // DO NOT IMPLEMENT
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void operator=(const X86MCCodeEmitter &); // DO NOT IMPLEMENT
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const MCInstrInfo &MCII;
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const MCSubtargetInfo &STI;
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MCContext &Ctx;
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public:
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X86MCCodeEmitter(const MCInstrInfo &mcii, const MCSubtargetInfo &sti,
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MCContext &ctx)
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: MCII(mcii), STI(sti), Ctx(ctx) {
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}
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~X86MCCodeEmitter() {}
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bool is64BitMode() const {
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// FIXME: Can tablegen auto-generate this?
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return (STI.getFeatureBits() & X86::Mode64Bit) != 0;
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}
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static unsigned GetX86RegNum(const MCOperand &MO) {
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return X86RegisterInfo::getX86RegNum(MO.getReg());
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}
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// On regular x86, both XMM0-XMM7 and XMM8-XMM15 are encoded in the range
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// 0-7 and the difference between the 2 groups is given by the REX prefix.
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// In the VEX prefix, registers are seen sequencially from 0-15 and encoded
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// in 1's complement form, example:
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//
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// ModRM field => XMM9 => 1
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// VEX.VVVV => XMM9 => ~9
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//
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// See table 4-35 of Intel AVX Programming Reference for details.
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static unsigned char getVEXRegisterEncoding(const MCInst &MI,
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unsigned OpNum) {
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unsigned SrcReg = MI.getOperand(OpNum).getReg();
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unsigned SrcRegNum = GetX86RegNum(MI.getOperand(OpNum));
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if ((SrcReg >= X86::XMM8 && SrcReg <= X86::XMM15) ||
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(SrcReg >= X86::YMM8 && SrcReg <= X86::YMM15))
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SrcRegNum += 8;
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// The registers represented through VEX_VVVV should
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// be encoded in 1's complement form.
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return (~SrcRegNum) & 0xf;
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}
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void EmitByte(unsigned char C, unsigned &CurByte, raw_ostream &OS) const {
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OS << (char)C;
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++CurByte;
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}
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void EmitConstant(uint64_t Val, unsigned Size, unsigned &CurByte,
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raw_ostream &OS) const {
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// Output the constant in little endian byte order.
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for (unsigned i = 0; i != Size; ++i) {
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EmitByte(Val & 255, CurByte, OS);
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Val >>= 8;
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}
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}
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void EmitImmediate(const MCOperand &Disp,
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unsigned ImmSize, MCFixupKind FixupKind,
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unsigned &CurByte, raw_ostream &OS,
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SmallVectorImpl<MCFixup> &Fixups,
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int ImmOffset = 0) const;
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inline static unsigned char ModRMByte(unsigned Mod, unsigned RegOpcode,
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unsigned RM) {
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assert(Mod < 4 && RegOpcode < 8 && RM < 8 && "ModRM Fields out of range!");
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return RM | (RegOpcode << 3) | (Mod << 6);
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}
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void EmitRegModRMByte(const MCOperand &ModRMReg, unsigned RegOpcodeFld,
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unsigned &CurByte, raw_ostream &OS) const {
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EmitByte(ModRMByte(3, RegOpcodeFld, GetX86RegNum(ModRMReg)), CurByte, OS);
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}
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void EmitSIBByte(unsigned SS, unsigned Index, unsigned Base,
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unsigned &CurByte, raw_ostream &OS) const {
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// SIB byte is in the same format as the ModRMByte.
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EmitByte(ModRMByte(SS, Index, Base), CurByte, OS);
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}
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void EmitMemModRMByte(const MCInst &MI, unsigned Op,
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unsigned RegOpcodeField,
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uint64_t TSFlags, unsigned &CurByte, raw_ostream &OS,
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SmallVectorImpl<MCFixup> &Fixups) const;
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void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
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SmallVectorImpl<MCFixup> &Fixups) const;
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void EmitVEXOpcodePrefix(uint64_t TSFlags, unsigned &CurByte, int MemOperand,
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const MCInst &MI, const MCInstrDesc &Desc,
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raw_ostream &OS) const;
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void EmitSegmentOverridePrefix(uint64_t TSFlags, unsigned &CurByte,
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int MemOperand, const MCInst &MI,
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raw_ostream &OS) const;
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void EmitOpcodePrefix(uint64_t TSFlags, unsigned &CurByte, int MemOperand,
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const MCInst &MI, const MCInstrDesc &Desc,
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raw_ostream &OS) const;
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};
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} // end anonymous namespace
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MCCodeEmitter *llvm::createX86MCCodeEmitter(const MCInstrInfo &MCII,
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const MCSubtargetInfo &STI,
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MCContext &Ctx) {
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return new X86MCCodeEmitter(MCII, STI, Ctx);
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}
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/// isDisp8 - Return true if this signed displacement fits in a 8-bit
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/// sign-extended field.
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static bool isDisp8(int Value) {
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return Value == (signed char)Value;
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}
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/// getImmFixupKind - Return the appropriate fixup kind to use for an immediate
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/// in an instruction with the specified TSFlags.
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static MCFixupKind getImmFixupKind(uint64_t TSFlags) {
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unsigned Size = X86II::getSizeOfImm(TSFlags);
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bool isPCRel = X86II::isImmPCRel(TSFlags);
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return MCFixup::getKindForSize(Size, isPCRel);
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}
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/// Is32BitMemOperand - Return true if the specified instruction with a memory
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/// operand should emit the 0x67 prefix byte in 64-bit mode due to a 32-bit
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/// memory operand. Op specifies the operand # of the memoperand.
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static bool Is32BitMemOperand(const MCInst &MI, unsigned Op) {
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const MCOperand &BaseReg = MI.getOperand(Op+X86::AddrBaseReg);
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const MCOperand &IndexReg = MI.getOperand(Op+X86::AddrIndexReg);
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if ((BaseReg.getReg() != 0 && X86::GR32RegClass.contains(BaseReg.getReg())) ||
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(IndexReg.getReg() != 0 && X86::GR32RegClass.contains(IndexReg.getReg())))
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return true;
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return false;
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}
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/// StartsWithGlobalOffsetTable - Return true for the simple cases where this
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/// expression starts with _GLOBAL_OFFSET_TABLE_. This is a needed to support
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/// PIC on ELF i386 as that symbol is magic. We check only simple case that
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/// are know to be used: _GLOBAL_OFFSET_TABLE_ by itself or at the start
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/// of a binary expression.
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static bool StartsWithGlobalOffsetTable(const MCExpr *Expr) {
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if (Expr->getKind() == MCExpr::Binary) {
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const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Expr);
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Expr = BE->getLHS();
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}
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if (Expr->getKind() != MCExpr::SymbolRef)
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return false;
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const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Expr);
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const MCSymbol &S = Ref->getSymbol();
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return S.getName() == "_GLOBAL_OFFSET_TABLE_";
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}
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void X86MCCodeEmitter::
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EmitImmediate(const MCOperand &DispOp, unsigned Size, MCFixupKind FixupKind,
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unsigned &CurByte, raw_ostream &OS,
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SmallVectorImpl<MCFixup> &Fixups, int ImmOffset) const {
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const MCExpr *Expr = NULL;
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if (DispOp.isImm()) {
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// If this is a simple integer displacement that doesn't require a relocation,
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// emit it now.
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if (FixupKind != FK_PCRel_1 &&
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FixupKind != FK_PCRel_2 &&
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FixupKind != FK_PCRel_4) {
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EmitConstant(DispOp.getImm()+ImmOffset, Size, CurByte, OS);
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return;
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}
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Expr = MCConstantExpr::Create(DispOp.getImm(), Ctx);
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} else {
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Expr = DispOp.getExpr();
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}
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// If we have an immoffset, add it to the expression.
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if (FixupKind == FK_Data_4 && StartsWithGlobalOffsetTable(Expr)) {
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assert(ImmOffset == 0);
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FixupKind = MCFixupKind(X86::reloc_global_offset_table);
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ImmOffset = CurByte;
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}
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// If the fixup is pc-relative, we need to bias the value to be relative to
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// the start of the field, not the end of the field.
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if (FixupKind == FK_PCRel_4 ||
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FixupKind == MCFixupKind(X86::reloc_riprel_4byte) ||
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FixupKind == MCFixupKind(X86::reloc_riprel_4byte_movq_load))
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ImmOffset -= 4;
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if (FixupKind == FK_PCRel_2)
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ImmOffset -= 2;
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if (FixupKind == FK_PCRel_1)
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ImmOffset -= 1;
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if (ImmOffset)
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Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(ImmOffset, Ctx),
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Ctx);
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// Emit a symbolic constant as a fixup and 4 zeros.
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Fixups.push_back(MCFixup::Create(CurByte, Expr, FixupKind));
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EmitConstant(0, Size, CurByte, OS);
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}
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void X86MCCodeEmitter::EmitMemModRMByte(const MCInst &MI, unsigned Op,
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unsigned RegOpcodeField,
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uint64_t TSFlags, unsigned &CurByte,
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raw_ostream &OS,
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SmallVectorImpl<MCFixup> &Fixups) const{
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const MCOperand &Disp = MI.getOperand(Op+X86::AddrDisp);
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const MCOperand &Base = MI.getOperand(Op+X86::AddrBaseReg);
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const MCOperand &Scale = MI.getOperand(Op+X86::AddrScaleAmt);
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const MCOperand &IndexReg = MI.getOperand(Op+X86::AddrIndexReg);
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unsigned BaseReg = Base.getReg();
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// Handle %rip relative addressing.
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if (BaseReg == X86::RIP) { // [disp32+RIP] in X86-64 mode
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assert(is64BitMode() && "Rip-relative addressing requires 64-bit mode");
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assert(IndexReg.getReg() == 0 && "Invalid rip-relative address");
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EmitByte(ModRMByte(0, RegOpcodeField, 5), CurByte, OS);
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unsigned FixupKind = X86::reloc_riprel_4byte;
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// movq loads are handled with a special relocation form which allows the
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// linker to eliminate some loads for GOT references which end up in the
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// same linkage unit.
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if (MI.getOpcode() == X86::MOV64rm)
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FixupKind = X86::reloc_riprel_4byte_movq_load;
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// rip-relative addressing is actually relative to the *next* instruction.
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// Since an immediate can follow the mod/rm byte for an instruction, this
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// means that we need to bias the immediate field of the instruction with
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// the size of the immediate field. If we have this case, add it into the
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// expression to emit.
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int ImmSize = X86II::hasImm(TSFlags) ? X86II::getSizeOfImm(TSFlags) : 0;
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EmitImmediate(Disp, 4, MCFixupKind(FixupKind),
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CurByte, OS, Fixups, -ImmSize);
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return;
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}
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unsigned BaseRegNo = BaseReg ? GetX86RegNum(Base) : -1U;
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// Determine whether a SIB byte is needed.
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// If no BaseReg, issue a RIP relative instruction only if the MCE can
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// resolve addresses on-the-fly, otherwise use SIB (Intel Manual 2A, table
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// 2-7) and absolute references.
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if (// The SIB byte must be used if there is an index register.
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IndexReg.getReg() == 0 &&
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// The SIB byte must be used if the base is ESP/RSP/R12, all of which
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// encode to an R/M value of 4, which indicates that a SIB byte is
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// present.
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BaseRegNo != N86::ESP &&
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// If there is no base register and we're in 64-bit mode, we need a SIB
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// byte to emit an addr that is just 'disp32' (the non-RIP relative form).
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(!is64BitMode() || BaseReg != 0)) {
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if (BaseReg == 0) { // [disp32] in X86-32 mode
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EmitByte(ModRMByte(0, RegOpcodeField, 5), CurByte, OS);
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EmitImmediate(Disp, 4, FK_Data_4, CurByte, OS, Fixups);
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return;
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}
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// If the base is not EBP/ESP and there is no displacement, use simple
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// indirect register encoding, this handles addresses like [EAX]. The
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// encoding for [EBP] with no displacement means [disp32] so we handle it
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// by emitting a displacement of 0 below.
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if (Disp.isImm() && Disp.getImm() == 0 && BaseRegNo != N86::EBP) {
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EmitByte(ModRMByte(0, RegOpcodeField, BaseRegNo), CurByte, OS);
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return;
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}
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// Otherwise, if the displacement fits in a byte, encode as [REG+disp8].
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if (Disp.isImm() && isDisp8(Disp.getImm())) {
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EmitByte(ModRMByte(1, RegOpcodeField, BaseRegNo), CurByte, OS);
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EmitImmediate(Disp, 1, FK_Data_1, CurByte, OS, Fixups);
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return;
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}
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// Otherwise, emit the most general non-SIB encoding: [REG+disp32]
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EmitByte(ModRMByte(2, RegOpcodeField, BaseRegNo), CurByte, OS);
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EmitImmediate(Disp, 4, MCFixupKind(X86::reloc_signed_4byte), CurByte, OS,
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Fixups);
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return;
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}
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// We need a SIB byte, so start by outputting the ModR/M byte first
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assert(IndexReg.getReg() != X86::ESP &&
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IndexReg.getReg() != X86::RSP && "Cannot use ESP as index reg!");
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bool ForceDisp32 = false;
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bool ForceDisp8 = false;
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if (BaseReg == 0) {
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// If there is no base register, we emit the special case SIB byte with
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// MOD=0, BASE=5, to JUST get the index, scale, and displacement.
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EmitByte(ModRMByte(0, RegOpcodeField, 4), CurByte, OS);
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ForceDisp32 = true;
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} else if (!Disp.isImm()) {
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// Emit the normal disp32 encoding.
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EmitByte(ModRMByte(2, RegOpcodeField, 4), CurByte, OS);
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ForceDisp32 = true;
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} else if (Disp.getImm() == 0 &&
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// Base reg can't be anything that ends up with '5' as the base
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// reg, it is the magic [*] nomenclature that indicates no base.
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BaseRegNo != N86::EBP) {
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// Emit no displacement ModR/M byte
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EmitByte(ModRMByte(0, RegOpcodeField, 4), CurByte, OS);
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} else if (isDisp8(Disp.getImm())) {
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// Emit the disp8 encoding.
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EmitByte(ModRMByte(1, RegOpcodeField, 4), CurByte, OS);
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ForceDisp8 = true; // Make sure to force 8 bit disp if Base=EBP
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} else {
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// Emit the normal disp32 encoding.
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EmitByte(ModRMByte(2, RegOpcodeField, 4), CurByte, OS);
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}
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// Calculate what the SS field value should be...
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static const unsigned SSTable[] = { ~0, 0, 1, ~0, 2, ~0, ~0, ~0, 3 };
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unsigned SS = SSTable[Scale.getImm()];
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if (BaseReg == 0) {
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// Handle the SIB byte for the case where there is no base, see Intel
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// Manual 2A, table 2-7. The displacement has already been output.
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unsigned IndexRegNo;
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if (IndexReg.getReg())
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IndexRegNo = GetX86RegNum(IndexReg);
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else // Examples: [ESP+1*<noreg>+4] or [scaled idx]+disp32 (MOD=0,BASE=5)
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IndexRegNo = 4;
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EmitSIBByte(SS, IndexRegNo, 5, CurByte, OS);
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} else {
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unsigned IndexRegNo;
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if (IndexReg.getReg())
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IndexRegNo = GetX86RegNum(IndexReg);
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else
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IndexRegNo = 4; // For example [ESP+1*<noreg>+4]
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EmitSIBByte(SS, IndexRegNo, GetX86RegNum(Base), CurByte, OS);
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}
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// Do we need to output a displacement?
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if (ForceDisp8)
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EmitImmediate(Disp, 1, FK_Data_1, CurByte, OS, Fixups);
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else if (ForceDisp32 || Disp.getImm() != 0)
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EmitImmediate(Disp, 4, MCFixupKind(X86::reloc_signed_4byte), CurByte, OS,
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Fixups);
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}
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/// EmitVEXOpcodePrefix - AVX instructions are encoded using a opcode prefix
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/// called VEX.
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void X86MCCodeEmitter::EmitVEXOpcodePrefix(uint64_t TSFlags, unsigned &CurByte,
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int MemOperand, const MCInst &MI,
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const MCInstrDesc &Desc,
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raw_ostream &OS) const {
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bool HasVEX_4V = false;
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if ((TSFlags >> X86II::VEXShift) & X86II::VEX_4V)
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HasVEX_4V = true;
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// VEX_R: opcode externsion equivalent to REX.R in
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// 1's complement (inverted) form
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//
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// 1: Same as REX_R=0 (must be 1 in 32-bit mode)
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// 0: Same as REX_R=1 (64 bit mode only)
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//
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unsigned char VEX_R = 0x1;
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// VEX_X: equivalent to REX.X, only used when a
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// register is used for index in SIB Byte.
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//
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// 1: Same as REX.X=0 (must be 1 in 32-bit mode)
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// 0: Same as REX.X=1 (64-bit mode only)
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unsigned char VEX_X = 0x1;
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// VEX_B:
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//
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// 1: Same as REX_B=0 (ignored in 32-bit mode)
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// 0: Same as REX_B=1 (64 bit mode only)
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//
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unsigned char VEX_B = 0x1;
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// VEX_W: opcode specific (use like REX.W, or used for
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// opcode extension, or ignored, depending on the opcode byte)
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unsigned char VEX_W = 0;
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// VEX_5M (VEX m-mmmmm field):
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//
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// 0b00000: Reserved for future use
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// 0b00001: implied 0F leading opcode
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// 0b00010: implied 0F 38 leading opcode bytes
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// 0b00011: implied 0F 3A leading opcode bytes
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// 0b00100-0b11111: Reserved for future use
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//
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unsigned char VEX_5M = 0x1;
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// VEX_4V (VEX vvvv field): a register specifier
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// (in 1's complement form) or 1111 if unused.
|
|
unsigned char VEX_4V = 0xf;
|
|
|
|
// VEX_L (Vector Length):
|
|
//
|
|
// 0: scalar or 128-bit vector
|
|
// 1: 256-bit vector
|
|
//
|
|
unsigned char VEX_L = 0;
|
|
|
|
// VEX_PP: opcode extension providing equivalent
|
|
// functionality of a SIMD prefix
|
|
//
|
|
// 0b00: None
|
|
// 0b01: 66
|
|
// 0b10: F3
|
|
// 0b11: F2
|
|
//
|
|
unsigned char VEX_PP = 0;
|
|
|
|
// Encode the operand size opcode prefix as needed.
|
|
if (TSFlags & X86II::OpSize)
|
|
VEX_PP = 0x01;
|
|
|
|
if ((TSFlags >> X86II::VEXShift) & X86II::VEX_W)
|
|
VEX_W = 1;
|
|
|
|
if ((TSFlags >> X86II::VEXShift) & X86II::VEX_L)
|
|
VEX_L = 1;
|
|
|
|
switch (TSFlags & X86II::Op0Mask) {
|
|
default: assert(0 && "Invalid prefix!");
|
|
case X86II::T8: // 0F 38
|
|
VEX_5M = 0x2;
|
|
break;
|
|
case X86II::TA: // 0F 3A
|
|
VEX_5M = 0x3;
|
|
break;
|
|
case X86II::TF: // F2 0F 38
|
|
VEX_PP = 0x3;
|
|
VEX_5M = 0x2;
|
|
break;
|
|
case X86II::XS: // F3 0F
|
|
VEX_PP = 0x2;
|
|
break;
|
|
case X86II::XD: // F2 0F
|
|
VEX_PP = 0x3;
|
|
break;
|
|
case X86II::A6: // Bypass: Not used by VEX
|
|
case X86II::A7: // Bypass: Not used by VEX
|
|
case X86II::TB: // Bypass: Not used by VEX
|
|
case 0:
|
|
break; // No prefix!
|
|
}
|
|
|
|
// Set the vector length to 256-bit if YMM0-YMM15 is used
|
|
for (unsigned i = 0; i != MI.getNumOperands(); ++i) {
|
|
if (!MI.getOperand(i).isReg())
|
|
continue;
|
|
unsigned SrcReg = MI.getOperand(i).getReg();
|
|
if (SrcReg >= X86::YMM0 && SrcReg <= X86::YMM15)
|
|
VEX_L = 1;
|
|
}
|
|
|
|
unsigned NumOps = MI.getNumOperands();
|
|
unsigned CurOp = 0;
|
|
bool IsDestMem = false;
|
|
|
|
switch (TSFlags & X86II::FormMask) {
|
|
case X86II::MRMInitReg: assert(0 && "FIXME: Remove this!");
|
|
case X86II::MRMDestMem:
|
|
IsDestMem = true;
|
|
// The important info for the VEX prefix is never beyond the address
|
|
// registers. Don't check beyond that.
|
|
NumOps = CurOp = X86::AddrNumOperands;
|
|
case X86II::MRM0m: case X86II::MRM1m:
|
|
case X86II::MRM2m: case X86II::MRM3m:
|
|
case X86II::MRM4m: case X86II::MRM5m:
|
|
case X86II::MRM6m: case X86II::MRM7m:
|
|
case X86II::MRMSrcMem:
|
|
case X86II::MRMSrcReg:
|
|
if (MI.getNumOperands() > CurOp && MI.getOperand(CurOp).isReg() &&
|
|
X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
|
|
VEX_R = 0x0;
|
|
CurOp++;
|
|
|
|
if (HasVEX_4V) {
|
|
VEX_4V = getVEXRegisterEncoding(MI, IsDestMem ? CurOp-1 : CurOp);
|
|
CurOp++;
|
|
}
|
|
|
|
// To only check operands before the memory address ones, start
|
|
// the search from the beginning
|
|
if (IsDestMem)
|
|
CurOp = 0;
|
|
|
|
// If the last register should be encoded in the immediate field
|
|
// do not use any bit from VEX prefix to this register, ignore it
|
|
if ((TSFlags >> X86II::VEXShift) & X86II::VEX_I8IMM)
|
|
NumOps--;
|
|
|
|
for (; CurOp != NumOps; ++CurOp) {
|
|
const MCOperand &MO = MI.getOperand(CurOp);
|
|
if (MO.isReg() && X86InstrInfo::isX86_64ExtendedReg(MO.getReg()))
|
|
VEX_B = 0x0;
|
|
if (!VEX_B && MO.isReg() &&
|
|
((TSFlags & X86II::FormMask) == X86II::MRMSrcMem) &&
|
|
X86InstrInfo::isX86_64ExtendedReg(MO.getReg()))
|
|
VEX_X = 0x0;
|
|
}
|
|
break;
|
|
default: // MRMDestReg, MRM0r-MRM7r, RawFrm
|
|
if (!MI.getNumOperands())
|
|
break;
|
|
|
|
if (MI.getOperand(CurOp).isReg() &&
|
|
X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
|
|
VEX_B = 0;
|
|
|
|
if (HasVEX_4V)
|
|
VEX_4V = getVEXRegisterEncoding(MI, CurOp);
|
|
|
|
CurOp++;
|
|
for (; CurOp != NumOps; ++CurOp) {
|
|
const MCOperand &MO = MI.getOperand(CurOp);
|
|
if (MO.isReg() && !HasVEX_4V &&
|
|
X86InstrInfo::isX86_64ExtendedReg(MO.getReg()))
|
|
VEX_R = 0x0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
// Emit segment override opcode prefix as needed.
|
|
EmitSegmentOverridePrefix(TSFlags, CurByte, MemOperand, MI, OS);
|
|
|
|
// VEX opcode prefix can have 2 or 3 bytes
|
|
//
|
|
// 3 bytes:
|
|
// +-----+ +--------------+ +-------------------+
|
|
// | C4h | | RXB | m-mmmm | | W | vvvv | L | pp |
|
|
// +-----+ +--------------+ +-------------------+
|
|
// 2 bytes:
|
|
// +-----+ +-------------------+
|
|
// | C5h | | R | vvvv | L | pp |
|
|
// +-----+ +-------------------+
|
|
//
|
|
unsigned char LastByte = VEX_PP | (VEX_L << 2) | (VEX_4V << 3);
|
|
|
|
if (VEX_B && VEX_X && !VEX_W && (VEX_5M == 1)) { // 2 byte VEX prefix
|
|
EmitByte(0xC5, CurByte, OS);
|
|
EmitByte(LastByte | (VEX_R << 7), CurByte, OS);
|
|
return;
|
|
}
|
|
|
|
// 3 byte VEX prefix
|
|
EmitByte(0xC4, CurByte, OS);
|
|
EmitByte(VEX_R << 7 | VEX_X << 6 | VEX_B << 5 | VEX_5M, CurByte, OS);
|
|
EmitByte(LastByte | (VEX_W << 7), CurByte, OS);
|
|
}
|
|
|
|
/// DetermineREXPrefix - Determine if the MCInst has to be encoded with a X86-64
|
|
/// REX prefix which specifies 1) 64-bit instructions, 2) non-default operand
|
|
/// size, and 3) use of X86-64 extended registers.
|
|
static unsigned DetermineREXPrefix(const MCInst &MI, uint64_t TSFlags,
|
|
const MCInstrDesc &Desc) {
|
|
unsigned REX = 0;
|
|
if (TSFlags & X86II::REX_W)
|
|
REX |= 1 << 3; // set REX.W
|
|
|
|
if (MI.getNumOperands() == 0) return REX;
|
|
|
|
unsigned NumOps = MI.getNumOperands();
|
|
// FIXME: MCInst should explicitize the two-addrness.
|
|
bool isTwoAddr = NumOps > 1 &&
|
|
Desc.getOperandConstraint(1, MCOI::TIED_TO) != -1;
|
|
|
|
// If it accesses SPL, BPL, SIL, or DIL, then it requires a 0x40 REX prefix.
|
|
unsigned i = isTwoAddr ? 1 : 0;
|
|
for (; i != NumOps; ++i) {
|
|
const MCOperand &MO = MI.getOperand(i);
|
|
if (!MO.isReg()) continue;
|
|
unsigned Reg = MO.getReg();
|
|
if (!X86InstrInfo::isX86_64NonExtLowByteReg(Reg)) continue;
|
|
// FIXME: The caller of DetermineREXPrefix slaps this prefix onto anything
|
|
// that returns non-zero.
|
|
REX |= 0x40; // REX fixed encoding prefix
|
|
break;
|
|
}
|
|
|
|
switch (TSFlags & X86II::FormMask) {
|
|
case X86II::MRMInitReg: assert(0 && "FIXME: Remove this!");
|
|
case X86II::MRMSrcReg:
|
|
if (MI.getOperand(0).isReg() &&
|
|
X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(0).getReg()))
|
|
REX |= 1 << 2; // set REX.R
|
|
i = isTwoAddr ? 2 : 1;
|
|
for (; i != NumOps; ++i) {
|
|
const MCOperand &MO = MI.getOperand(i);
|
|
if (MO.isReg() && X86InstrInfo::isX86_64ExtendedReg(MO.getReg()))
|
|
REX |= 1 << 0; // set REX.B
|
|
}
|
|
break;
|
|
case X86II::MRMSrcMem: {
|
|
if (MI.getOperand(0).isReg() &&
|
|
X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(0).getReg()))
|
|
REX |= 1 << 2; // set REX.R
|
|
unsigned Bit = 0;
|
|
i = isTwoAddr ? 2 : 1;
|
|
for (; i != NumOps; ++i) {
|
|
const MCOperand &MO = MI.getOperand(i);
|
|
if (MO.isReg()) {
|
|
if (X86InstrInfo::isX86_64ExtendedReg(MO.getReg()))
|
|
REX |= 1 << Bit; // set REX.B (Bit=0) and REX.X (Bit=1)
|
|
Bit++;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case X86II::MRM0m: case X86II::MRM1m:
|
|
case X86II::MRM2m: case X86II::MRM3m:
|
|
case X86II::MRM4m: case X86II::MRM5m:
|
|
case X86II::MRM6m: case X86II::MRM7m:
|
|
case X86II::MRMDestMem: {
|
|
unsigned e = (isTwoAddr ? X86::AddrNumOperands+1 : X86::AddrNumOperands);
|
|
i = isTwoAddr ? 1 : 0;
|
|
if (NumOps > e && MI.getOperand(e).isReg() &&
|
|
X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(e).getReg()))
|
|
REX |= 1 << 2; // set REX.R
|
|
unsigned Bit = 0;
|
|
for (; i != e; ++i) {
|
|
const MCOperand &MO = MI.getOperand(i);
|
|
if (MO.isReg()) {
|
|
if (X86InstrInfo::isX86_64ExtendedReg(MO.getReg()))
|
|
REX |= 1 << Bit; // REX.B (Bit=0) and REX.X (Bit=1)
|
|
Bit++;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
if (MI.getOperand(0).isReg() &&
|
|
X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(0).getReg()))
|
|
REX |= 1 << 0; // set REX.B
|
|
i = isTwoAddr ? 2 : 1;
|
|
for (unsigned e = NumOps; i != e; ++i) {
|
|
const MCOperand &MO = MI.getOperand(i);
|
|
if (MO.isReg() && X86InstrInfo::isX86_64ExtendedReg(MO.getReg()))
|
|
REX |= 1 << 2; // set REX.R
|
|
}
|
|
break;
|
|
}
|
|
return REX;
|
|
}
|
|
|
|
/// EmitSegmentOverridePrefix - Emit segment override opcode prefix as needed
|
|
void X86MCCodeEmitter::EmitSegmentOverridePrefix(uint64_t TSFlags,
|
|
unsigned &CurByte, int MemOperand,
|
|
const MCInst &MI,
|
|
raw_ostream &OS) const {
|
|
switch (TSFlags & X86II::SegOvrMask) {
|
|
default: assert(0 && "Invalid segment!");
|
|
case 0:
|
|
// No segment override, check for explicit one on memory operand.
|
|
if (MemOperand != -1) { // If the instruction has a memory operand.
|
|
switch (MI.getOperand(MemOperand+X86::AddrSegmentReg).getReg()) {
|
|
default: assert(0 && "Unknown segment register!");
|
|
case 0: break;
|
|
case X86::CS: EmitByte(0x2E, CurByte, OS); break;
|
|
case X86::SS: EmitByte(0x36, CurByte, OS); break;
|
|
case X86::DS: EmitByte(0x3E, CurByte, OS); break;
|
|
case X86::ES: EmitByte(0x26, CurByte, OS); break;
|
|
case X86::FS: EmitByte(0x64, CurByte, OS); break;
|
|
case X86::GS: EmitByte(0x65, CurByte, OS); break;
|
|
}
|
|
}
|
|
break;
|
|
case X86II::FS:
|
|
EmitByte(0x64, CurByte, OS);
|
|
break;
|
|
case X86II::GS:
|
|
EmitByte(0x65, CurByte, OS);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/// EmitOpcodePrefix - Emit all instruction prefixes prior to the opcode.
|
|
///
|
|
/// MemOperand is the operand # of the start of a memory operand if present. If
|
|
/// Not present, it is -1.
|
|
void X86MCCodeEmitter::EmitOpcodePrefix(uint64_t TSFlags, unsigned &CurByte,
|
|
int MemOperand, const MCInst &MI,
|
|
const MCInstrDesc &Desc,
|
|
raw_ostream &OS) const {
|
|
|
|
// Emit the lock opcode prefix as needed.
|
|
if (TSFlags & X86II::LOCK)
|
|
EmitByte(0xF0, CurByte, OS);
|
|
|
|
// Emit segment override opcode prefix as needed.
|
|
EmitSegmentOverridePrefix(TSFlags, CurByte, MemOperand, MI, OS);
|
|
|
|
// Emit the repeat opcode prefix as needed.
|
|
if ((TSFlags & X86II::Op0Mask) == X86II::REP)
|
|
EmitByte(0xF3, CurByte, OS);
|
|
|
|
// Emit the address size opcode prefix as needed.
|
|
if ((TSFlags & X86II::AdSize) ||
|
|
(MemOperand != -1 && is64BitMode() && Is32BitMemOperand(MI, MemOperand)))
|
|
EmitByte(0x67, CurByte, OS);
|
|
|
|
// Emit the operand size opcode prefix as needed.
|
|
if (TSFlags & X86II::OpSize)
|
|
EmitByte(0x66, CurByte, OS);
|
|
|
|
bool Need0FPrefix = false;
|
|
switch (TSFlags & X86II::Op0Mask) {
|
|
default: assert(0 && "Invalid prefix!");
|
|
case 0: break; // No prefix!
|
|
case X86II::REP: break; // already handled.
|
|
case X86II::TB: // Two-byte opcode prefix
|
|
case X86II::T8: // 0F 38
|
|
case X86II::TA: // 0F 3A
|
|
case X86II::A6: // 0F A6
|
|
case X86II::A7: // 0F A7
|
|
Need0FPrefix = true;
|
|
break;
|
|
case X86II::TF: // F2 0F 38
|
|
EmitByte(0xF2, CurByte, OS);
|
|
Need0FPrefix = true;
|
|
break;
|
|
case X86II::XS: // F3 0F
|
|
EmitByte(0xF3, CurByte, OS);
|
|
Need0FPrefix = true;
|
|
break;
|
|
case X86II::XD: // F2 0F
|
|
EmitByte(0xF2, CurByte, OS);
|
|
Need0FPrefix = true;
|
|
break;
|
|
case X86II::D8: EmitByte(0xD8, CurByte, OS); break;
|
|
case X86II::D9: EmitByte(0xD9, CurByte, OS); break;
|
|
case X86II::DA: EmitByte(0xDA, CurByte, OS); break;
|
|
case X86II::DB: EmitByte(0xDB, CurByte, OS); break;
|
|
case X86II::DC: EmitByte(0xDC, CurByte, OS); break;
|
|
case X86II::DD: EmitByte(0xDD, CurByte, OS); break;
|
|
case X86II::DE: EmitByte(0xDE, CurByte, OS); break;
|
|
case X86II::DF: EmitByte(0xDF, CurByte, OS); break;
|
|
}
|
|
|
|
// Handle REX prefix.
|
|
// FIXME: Can this come before F2 etc to simplify emission?
|
|
if (is64BitMode()) {
|
|
if (unsigned REX = DetermineREXPrefix(MI, TSFlags, Desc))
|
|
EmitByte(0x40 | REX, CurByte, OS);
|
|
}
|
|
|
|
// 0x0F escape code must be emitted just before the opcode.
|
|
if (Need0FPrefix)
|
|
EmitByte(0x0F, CurByte, OS);
|
|
|
|
// FIXME: Pull this up into previous switch if REX can be moved earlier.
|
|
switch (TSFlags & X86II::Op0Mask) {
|
|
case X86II::TF: // F2 0F 38
|
|
case X86II::T8: // 0F 38
|
|
EmitByte(0x38, CurByte, OS);
|
|
break;
|
|
case X86II::TA: // 0F 3A
|
|
EmitByte(0x3A, CurByte, OS);
|
|
break;
|
|
case X86II::A6: // 0F A6
|
|
EmitByte(0xA6, CurByte, OS);
|
|
break;
|
|
case X86II::A7: // 0F A7
|
|
EmitByte(0xA7, CurByte, OS);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void X86MCCodeEmitter::
|
|
EncodeInstruction(const MCInst &MI, raw_ostream &OS,
|
|
SmallVectorImpl<MCFixup> &Fixups) const {
|
|
unsigned Opcode = MI.getOpcode();
|
|
const MCInstrDesc &Desc = MCII.get(Opcode);
|
|
uint64_t TSFlags = Desc.TSFlags;
|
|
|
|
// Pseudo instructions don't get encoded.
|
|
if ((TSFlags & X86II::FormMask) == X86II::Pseudo)
|
|
return;
|
|
|
|
// If this is a two-address instruction, skip one of the register operands.
|
|
// FIXME: This should be handled during MCInst lowering.
|
|
unsigned NumOps = Desc.getNumOperands();
|
|
unsigned CurOp = 0;
|
|
if (NumOps > 1 && Desc.getOperandConstraint(1, MCOI::TIED_TO) != -1)
|
|
++CurOp;
|
|
else if (NumOps > 2 && Desc.getOperandConstraint(NumOps-1, MCOI::TIED_TO)== 0)
|
|
// Skip the last source operand that is tied_to the dest reg. e.g. LXADD32
|
|
--NumOps;
|
|
|
|
// Keep track of the current byte being emitted.
|
|
unsigned CurByte = 0;
|
|
|
|
// Is this instruction encoded using the AVX VEX prefix?
|
|
bool HasVEXPrefix = false;
|
|
|
|
// It uses the VEX.VVVV field?
|
|
bool HasVEX_4V = false;
|
|
|
|
if ((TSFlags >> X86II::VEXShift) & X86II::VEX)
|
|
HasVEXPrefix = true;
|
|
if ((TSFlags >> X86II::VEXShift) & X86II::VEX_4V)
|
|
HasVEX_4V = true;
|
|
|
|
|
|
// Determine where the memory operand starts, if present.
|
|
int MemoryOperand = X86II::getMemoryOperandNo(TSFlags);
|
|
if (MemoryOperand != -1) MemoryOperand += CurOp;
|
|
|
|
if (!HasVEXPrefix)
|
|
EmitOpcodePrefix(TSFlags, CurByte, MemoryOperand, MI, Desc, OS);
|
|
else
|
|
EmitVEXOpcodePrefix(TSFlags, CurByte, MemoryOperand, MI, Desc, OS);
|
|
|
|
|
|
unsigned char BaseOpcode = X86II::getBaseOpcodeFor(TSFlags);
|
|
|
|
if ((TSFlags >> X86II::VEXShift) & X86II::Has3DNow0F0FOpcode)
|
|
BaseOpcode = 0x0F; // Weird 3DNow! encoding.
|
|
|
|
unsigned SrcRegNum = 0;
|
|
switch (TSFlags & X86II::FormMask) {
|
|
case X86II::MRMInitReg:
|
|
assert(0 && "FIXME: Remove this form when the JIT moves to MCCodeEmitter!");
|
|
default: errs() << "FORM: " << (TSFlags & X86II::FormMask) << "\n";
|
|
assert(0 && "Unknown FormMask value in X86MCCodeEmitter!");
|
|
case X86II::Pseudo:
|
|
assert(0 && "Pseudo instruction shouldn't be emitted");
|
|
case X86II::RawFrm:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
break;
|
|
|
|
case X86II::RawFrmImm8:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitImmediate(MI.getOperand(CurOp++),
|
|
X86II::getSizeOfImm(TSFlags), getImmFixupKind(TSFlags),
|
|
CurByte, OS, Fixups);
|
|
EmitImmediate(MI.getOperand(CurOp++), 1, FK_Data_1, CurByte, OS, Fixups);
|
|
break;
|
|
case X86II::RawFrmImm16:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitImmediate(MI.getOperand(CurOp++),
|
|
X86II::getSizeOfImm(TSFlags), getImmFixupKind(TSFlags),
|
|
CurByte, OS, Fixups);
|
|
EmitImmediate(MI.getOperand(CurOp++), 2, FK_Data_2, CurByte, OS, Fixups);
|
|
break;
|
|
|
|
case X86II::AddRegFrm:
|
|
EmitByte(BaseOpcode + GetX86RegNum(MI.getOperand(CurOp++)), CurByte, OS);
|
|
break;
|
|
|
|
case X86II::MRMDestReg:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitRegModRMByte(MI.getOperand(CurOp),
|
|
GetX86RegNum(MI.getOperand(CurOp+1)), CurByte, OS);
|
|
CurOp += 2;
|
|
break;
|
|
|
|
case X86II::MRMDestMem:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
SrcRegNum = CurOp + X86::AddrNumOperands;
|
|
|
|
if (HasVEX_4V) // Skip 1st src (which is encoded in VEX_VVVV)
|
|
SrcRegNum++;
|
|
|
|
EmitMemModRMByte(MI, CurOp,
|
|
GetX86RegNum(MI.getOperand(SrcRegNum)),
|
|
TSFlags, CurByte, OS, Fixups);
|
|
CurOp = SrcRegNum + 1;
|
|
break;
|
|
|
|
case X86II::MRMSrcReg:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
SrcRegNum = CurOp + 1;
|
|
|
|
if (HasVEX_4V) // Skip 1st src (which is encoded in VEX_VVVV)
|
|
SrcRegNum++;
|
|
|
|
EmitRegModRMByte(MI.getOperand(SrcRegNum),
|
|
GetX86RegNum(MI.getOperand(CurOp)), CurByte, OS);
|
|
CurOp = SrcRegNum + 1;
|
|
break;
|
|
|
|
case X86II::MRMSrcMem: {
|
|
int AddrOperands = X86::AddrNumOperands;
|
|
unsigned FirstMemOp = CurOp+1;
|
|
if (HasVEX_4V) {
|
|
++AddrOperands;
|
|
++FirstMemOp; // Skip the register source (which is encoded in VEX_VVVV).
|
|
}
|
|
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
|
|
EmitMemModRMByte(MI, FirstMemOp, GetX86RegNum(MI.getOperand(CurOp)),
|
|
TSFlags, CurByte, OS, Fixups);
|
|
CurOp += AddrOperands + 1;
|
|
break;
|
|
}
|
|
|
|
case X86II::MRM0r: case X86II::MRM1r:
|
|
case X86II::MRM2r: case X86II::MRM3r:
|
|
case X86II::MRM4r: case X86II::MRM5r:
|
|
case X86II::MRM6r: case X86II::MRM7r:
|
|
if (HasVEX_4V) // Skip the register dst (which is encoded in VEX_VVVV).
|
|
CurOp++;
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitRegModRMByte(MI.getOperand(CurOp++),
|
|
(TSFlags & X86II::FormMask)-X86II::MRM0r,
|
|
CurByte, OS);
|
|
break;
|
|
case X86II::MRM0m: case X86II::MRM1m:
|
|
case X86II::MRM2m: case X86II::MRM3m:
|
|
case X86II::MRM4m: case X86II::MRM5m:
|
|
case X86II::MRM6m: case X86II::MRM7m:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitMemModRMByte(MI, CurOp, (TSFlags & X86II::FormMask)-X86II::MRM0m,
|
|
TSFlags, CurByte, OS, Fixups);
|
|
CurOp += X86::AddrNumOperands;
|
|
break;
|
|
case X86II::MRM_C1:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xC1, CurByte, OS);
|
|
break;
|
|
case X86II::MRM_C2:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xC2, CurByte, OS);
|
|
break;
|
|
case X86II::MRM_C3:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xC3, CurByte, OS);
|
|
break;
|
|
case X86II::MRM_C4:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xC4, CurByte, OS);
|
|
break;
|
|
case X86II::MRM_C8:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xC8, CurByte, OS);
|
|
break;
|
|
case X86II::MRM_C9:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xC9, CurByte, OS);
|
|
break;
|
|
case X86II::MRM_E8:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xE8, CurByte, OS);
|
|
break;
|
|
case X86II::MRM_F0:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xF0, CurByte, OS);
|
|
break;
|
|
case X86II::MRM_F8:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xF8, CurByte, OS);
|
|
break;
|
|
case X86II::MRM_F9:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xF9, CurByte, OS);
|
|
break;
|
|
case X86II::MRM_D0:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xD0, CurByte, OS);
|
|
break;
|
|
case X86II::MRM_D1:
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
EmitByte(0xD1, CurByte, OS);
|
|
break;
|
|
}
|
|
|
|
// If there is a remaining operand, it must be a trailing immediate. Emit it
|
|
// according to the right size for the instruction.
|
|
if (CurOp != NumOps) {
|
|
// The last source register of a 4 operand instruction in AVX is encoded
|
|
// in bits[7:4] of a immediate byte, and bits[3:0] are ignored.
|
|
if ((TSFlags >> X86II::VEXShift) & X86II::VEX_I8IMM) {
|
|
const MCOperand &MO = MI.getOperand(CurOp++);
|
|
bool IsExtReg =
|
|
X86InstrInfo::isX86_64ExtendedReg(MO.getReg());
|
|
unsigned RegNum = (IsExtReg ? (1 << 7) : 0);
|
|
RegNum |= GetX86RegNum(MO) << 4;
|
|
EmitImmediate(MCOperand::CreateImm(RegNum), 1, FK_Data_1, CurByte, OS,
|
|
Fixups);
|
|
} else {
|
|
unsigned FixupKind;
|
|
// FIXME: Is there a better way to know that we need a signed relocation?
|
|
if (MI.getOpcode() == X86::ADD64ri32 ||
|
|
MI.getOpcode() == X86::MOV64ri32 ||
|
|
MI.getOpcode() == X86::MOV64mi32 ||
|
|
MI.getOpcode() == X86::PUSH64i32)
|
|
FixupKind = X86::reloc_signed_4byte;
|
|
else
|
|
FixupKind = getImmFixupKind(TSFlags);
|
|
EmitImmediate(MI.getOperand(CurOp++),
|
|
X86II::getSizeOfImm(TSFlags), MCFixupKind(FixupKind),
|
|
CurByte, OS, Fixups);
|
|
}
|
|
}
|
|
|
|
if ((TSFlags >> X86II::VEXShift) & X86II::Has3DNow0F0FOpcode)
|
|
EmitByte(X86II::getBaseOpcodeFor(TSFlags), CurByte, OS);
|
|
|
|
|
|
#ifndef NDEBUG
|
|
// FIXME: Verify.
|
|
if (/*!Desc.isVariadic() &&*/ CurOp != NumOps) {
|
|
errs() << "Cannot encode all operands of: ";
|
|
MI.dump();
|
|
errs() << '\n';
|
|
abort();
|
|
}
|
|
#endif
|
|
}
|