2010-02-03 21:24:49 +00:00
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//===-- 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 "x86-emitter"
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#include "X86.h"
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2010-02-03 21:43:43 +00:00
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#include "X86InstrInfo.h"
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2010-02-13 09:27:52 +00:00
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#include "X86FixupKinds.h"
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2010-02-03 21:24:49 +00:00
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#include "llvm/MC/MCCodeEmitter.h"
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2010-02-12 23:24:09 +00:00
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#include "llvm/MC/MCExpr.h"
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2010-02-03 21:43:43 +00:00
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#include "llvm/MC/MCInst.h"
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#include "llvm/Support/raw_ostream.h"
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2010-02-03 21:24:49 +00:00
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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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2010-02-03 21:43:43 +00:00
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const TargetMachine &TM;
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const TargetInstrInfo &TII;
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2010-02-12 23:24:09 +00:00
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MCContext &Ctx;
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2010-02-05 02:18:40 +00:00
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bool Is64BitMode;
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2010-02-03 21:24:49 +00:00
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public:
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X86MCCodeEmitter(TargetMachine &tm, MCContext &ctx, bool is64Bit)
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: TM(tm), TII(*TM.getInstrInfo()), Ctx(ctx) {
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2010-02-05 21:51:35 +00:00
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Is64BitMode = is64Bit;
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2010-02-03 21:24:49 +00:00
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}
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~X86MCCodeEmitter() {}
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2010-02-09 22:59:55 +00:00
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unsigned getNumFixupKinds() const {
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2010-03-18 18:10:56 +00:00
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return 4;
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}
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2010-02-11 21:27:18 +00:00
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const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
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const static MCFixupKindInfo Infos[] = {
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2010-02-11 21:17:54 +00:00
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{ "reloc_pcrel_4byte", 0, 4 * 8 },
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2010-02-12 23:00:36 +00:00
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{ "reloc_pcrel_1byte", 0, 1 * 8 },
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2010-03-18 18:10:56 +00:00
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{ "reloc_riprel_4byte", 0, 4 * 8 },
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{ "reloc_riprel_4byte_movq_load", 0, 4 * 8 }
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};
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2010-02-11 21:27:18 +00:00
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if (Kind < FirstTargetFixupKind)
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return MCCodeEmitter::getFixupKindInfo(Kind);
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2010-02-09 22:59:55 +00:00
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2010-02-11 21:27:18 +00:00
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assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
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2010-02-09 22:59:55 +00:00
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"Invalid kind!");
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return Infos[Kind - FirstTargetFixupKind];
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}
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2010-02-03 21:24:49 +00:00
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2010-02-05 01:53:19 +00:00
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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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2010-02-10 06:41:02 +00:00
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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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2010-02-03 21:24:49 +00:00
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}
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2010-02-03 21:43:43 +00:00
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2010-02-10 06:41:02 +00:00
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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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2010-02-05 01:53:19 +00:00
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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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2010-02-05 01:53:19 +00:00
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Val >>= 8;
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}
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}
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2010-02-05 06:16:07 +00:00
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2010-02-12 22:36:47 +00:00
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void EmitImmediate(const MCOperand &Disp,
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unsigned ImmSize, MCFixupKind FixupKind,
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2010-02-11 06:54:23 +00:00
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unsigned &CurByte, raw_ostream &OS,
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2010-02-12 23:00:36 +00:00
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SmallVectorImpl<MCFixup> &Fixups,
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int ImmOffset = 0) const;
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2010-02-05 01:53:19 +00:00
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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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2010-02-10 06:41:02 +00:00
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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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2010-02-05 01:53:19 +00:00
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}
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2010-02-05 06:16:07 +00:00
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void EmitSIBByte(unsigned SS, unsigned Index, unsigned Base,
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2010-02-10 06:41:02 +00:00
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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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2010-02-05 06:16:07 +00:00
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}
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2010-02-05 02:18:40 +00:00
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void EmitMemModRMByte(const MCInst &MI, unsigned Op,
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2010-02-11 06:49:52 +00:00
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unsigned RegOpcodeField,
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2010-02-12 23:00:36 +00:00
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unsigned TSFlags, unsigned &CurByte, raw_ostream &OS,
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2010-02-10 06:52:12 +00:00
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SmallVectorImpl<MCFixup> &Fixups) const;
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2010-02-05 01:53:19 +00:00
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2010-02-09 22:59:55 +00:00
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void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
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SmallVectorImpl<MCFixup> &Fixups) const;
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2010-02-03 21:43:43 +00:00
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2010-02-03 21:24:49 +00:00
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};
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} // end anonymous namespace
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2010-02-05 21:51:35 +00:00
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MCCodeEmitter *llvm::createX86_32MCCodeEmitter(const Target &,
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2010-02-12 23:12:47 +00:00
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TargetMachine &TM,
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MCContext &Ctx) {
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return new X86MCCodeEmitter(TM, Ctx, false);
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2010-02-05 21:51:35 +00:00
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}
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MCCodeEmitter *llvm::createX86_64MCCodeEmitter(const Target &,
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2010-02-12 23:12:47 +00:00
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TargetMachine &TM,
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MCContext &Ctx) {
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2010-02-12 23:24:09 +00:00
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return new X86MCCodeEmitter(TM, Ctx, true);
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2010-02-03 21:43:43 +00:00
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}
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2010-02-05 02:18:40 +00:00
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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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2010-02-12 22:36:47 +00:00
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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(unsigned TSFlags) {
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unsigned Size = X86II::getSizeOfImm(TSFlags);
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bool isPCRel = X86II::isImmPCRel(TSFlags);
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switch (Size) {
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default: assert(0 && "Unknown immediate size");
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case 1: return isPCRel ? MCFixupKind(X86::reloc_pcrel_1byte) : FK_Data_1;
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case 4: return isPCRel ? MCFixupKind(X86::reloc_pcrel_4byte) : FK_Data_4;
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case 2: assert(!isPCRel); return FK_Data_2;
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case 8: assert(!isPCRel); return FK_Data_8;
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}
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}
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2010-02-05 06:16:07 +00:00
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void X86MCCodeEmitter::
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EmitImmediate(const MCOperand &DispOp, unsigned Size, MCFixupKind FixupKind,
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2010-02-11 06:54:23 +00:00
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unsigned &CurByte, raw_ostream &OS,
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2010-02-12 23:00:36 +00:00
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SmallVectorImpl<MCFixup> &Fixups, int ImmOffset) const {
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2010-02-05 06:16:07 +00:00
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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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2010-02-10 06:30:00 +00:00
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if (DispOp.isImm()) {
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2010-02-16 05:03:17 +00:00
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// FIXME: is this right for pc-rel encoding?? Probably need to emit this as
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// a fixup if so.
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2010-02-12 23:00:36 +00:00
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EmitConstant(DispOp.getImm()+ImmOffset, Size, CurByte, OS);
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2010-02-05 06:16:07 +00:00
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return;
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}
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2010-02-10 06:41:02 +00:00
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2010-02-12 23:00:36 +00:00
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// If we have an immoffset, add it to the expression.
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const MCExpr *Expr = DispOp.getExpr();
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2010-02-16 05:03:17 +00:00
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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 == MCFixupKind(X86::reloc_pcrel_4byte) ||
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FixupKind == MCFixupKind(X86::reloc_riprel_4byte))
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ImmOffset -= 4;
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if (FixupKind == MCFixupKind(X86::reloc_pcrel_1byte))
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ImmOffset -= 1;
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2010-02-12 23:24:09 +00:00
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if (ImmOffset)
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2010-02-16 05:03:17 +00:00
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Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(ImmOffset, Ctx),
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2010-02-12 23:24:09 +00:00
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Ctx);
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2010-02-12 23:00:36 +00:00
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2010-02-10 06:52:12 +00:00
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// Emit a symbolic constant as a fixup and 4 zeros.
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2010-02-12 23:00:36 +00:00
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Fixups.push_back(MCFixup::Create(CurByte, Expr, FixupKind));
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2010-02-11 06:54:23 +00:00
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EmitConstant(0, Size, CurByte, OS);
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2010-02-05 06:16:07 +00:00
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}
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2010-02-05 02:18:40 +00:00
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void X86MCCodeEmitter::EmitMemModRMByte(const MCInst &MI, unsigned Op,
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unsigned RegOpcodeField,
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2010-02-12 23:00:36 +00:00
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unsigned TSFlags, unsigned &CurByte,
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2010-02-10 06:52:12 +00:00
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raw_ostream &OS,
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SmallVectorImpl<MCFixup> &Fixups) const{
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2010-02-10 06:30:00 +00:00
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const MCOperand &Disp = MI.getOperand(Op+3);
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2010-02-05 02:18:40 +00:00
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const MCOperand &Base = MI.getOperand(Op);
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2010-02-05 06:16:07 +00:00
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const MCOperand &Scale = MI.getOperand(Op+1);
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2010-02-05 02:18:40 +00:00
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const MCOperand &IndexReg = MI.getOperand(Op+2);
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unsigned BaseReg = Base.getReg();
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2010-02-12 22:47:55 +00:00
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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(IndexReg.getReg() == 0 && Is64BitMode &&
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"Invalid rip-relative address");
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EmitByte(ModRMByte(0, RegOpcodeField, 5), CurByte, OS);
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2010-02-12 23:00:36 +00:00
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2010-03-18 18:10:56 +00:00
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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_TC)
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FixupKind = X86::reloc_riprel_4byte_movq_load;
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2010-02-12 23:00:36 +00:00
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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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2010-02-16 05:03:17 +00:00
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2010-03-18 18:10:56 +00:00
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EmitImmediate(Disp, 4, MCFixupKind(FixupKind),
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2010-02-12 23:00:36 +00:00
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CurByte, OS, Fixups, -ImmSize);
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2010-02-12 22:47:55 +00:00
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return;
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}
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unsigned BaseRegNo = BaseReg ? GetX86RegNum(Base) : -1U;
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2010-02-11 08:45:56 +00:00
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2010-02-09 21:57:34 +00:00
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// Determine whether a SIB byte is needed.
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2010-02-05 02:18:40 +00:00
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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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2010-02-11 08:41:21 +00:00
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2010-02-09 21:57:34 +00:00
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if (// The SIB byte must be used if there is an index register.
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2010-02-05 02:18:40 +00:00
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IndexReg.getReg() == 0 &&
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2010-02-11 08:41:21 +00:00
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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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2010-02-09 21:57:34 +00:00
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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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2010-02-12 22:47:55 +00:00
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if (BaseReg == 0) { // [disp32] in X86-32 mode
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2010-02-10 06:41:02 +00:00
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EmitByte(ModRMByte(0, RegOpcodeField, 5), CurByte, OS);
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2010-02-12 22:36:47 +00:00
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EmitImmediate(Disp, 4, FK_Data_4, CurByte, OS, Fixups);
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2010-02-09 21:57:34 +00:00
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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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2010-02-10 06:30:00 +00:00
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if (Disp.isImm() && Disp.getImm() == 0 && BaseRegNo != N86::EBP) {
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2010-02-10 06:41:02 +00:00
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EmitByte(ModRMByte(0, RegOpcodeField, BaseRegNo), CurByte, OS);
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2010-02-09 21:57:34 +00:00
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return;
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2010-02-05 02:18:40 +00:00
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}
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2010-02-09 21:57:34 +00:00
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// Otherwise, if the displacement fits in a byte, encode as [REG+disp8].
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2010-02-10 06:30:00 +00:00
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if (Disp.isImm() && isDisp8(Disp.getImm())) {
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2010-02-10 06:41:02 +00:00
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EmitByte(ModRMByte(1, RegOpcodeField, BaseRegNo), CurByte, OS);
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2010-02-12 22:36:47 +00:00
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EmitImmediate(Disp, 1, FK_Data_1, CurByte, OS, Fixups);
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2010-02-09 21:57:34 +00:00
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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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2010-02-10 06:41:02 +00:00
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|
EmitByte(ModRMByte(2, RegOpcodeField, BaseRegNo), CurByte, OS);
|
2010-02-12 22:36:47 +00:00
|
|
|
EmitImmediate(Disp, 4, FK_Data_4, CurByte, OS, Fixups);
|
2010-02-05 06:16:07 +00:00
|
|
|
return;
|
|
|
|
}
|
2010-02-05 02:18:40 +00:00
|
|
|
|
2010-02-05 06:16:07 +00:00
|
|
|
// We need a SIB byte, so start by outputting the ModR/M byte first
|
|
|
|
assert(IndexReg.getReg() != X86::ESP &&
|
|
|
|
IndexReg.getReg() != X86::RSP && "Cannot use ESP as index reg!");
|
|
|
|
|
|
|
|
bool ForceDisp32 = false;
|
|
|
|
bool ForceDisp8 = false;
|
|
|
|
if (BaseReg == 0) {
|
|
|
|
// If there is no base register, we emit the special case SIB byte with
|
|
|
|
// MOD=0, BASE=5, to JUST get the index, scale, and displacement.
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(ModRMByte(0, RegOpcodeField, 4), CurByte, OS);
|
2010-02-05 06:16:07 +00:00
|
|
|
ForceDisp32 = true;
|
2010-02-10 06:30:00 +00:00
|
|
|
} else if (!Disp.isImm()) {
|
2010-02-05 06:16:07 +00:00
|
|
|
// Emit the normal disp32 encoding.
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(ModRMByte(2, RegOpcodeField, 4), CurByte, OS);
|
2010-02-05 06:16:07 +00:00
|
|
|
ForceDisp32 = true;
|
2010-03-18 20:04:36 +00:00
|
|
|
} else if (Disp.getImm() == 0 &&
|
|
|
|
// Base reg can't be anything that ends up with '5' as the base
|
|
|
|
// reg, it is the magic [*] nomenclature that indicates no base.
|
|
|
|
BaseRegNo != N86::EBP) {
|
2010-02-05 06:16:07 +00:00
|
|
|
// Emit no displacement ModR/M byte
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(ModRMByte(0, RegOpcodeField, 4), CurByte, OS);
|
2010-02-10 06:30:00 +00:00
|
|
|
} else if (isDisp8(Disp.getImm())) {
|
2010-02-05 06:16:07 +00:00
|
|
|
// Emit the disp8 encoding.
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(ModRMByte(1, RegOpcodeField, 4), CurByte, OS);
|
2010-02-05 06:16:07 +00:00
|
|
|
ForceDisp8 = true; // Make sure to force 8 bit disp if Base=EBP
|
|
|
|
} else {
|
|
|
|
// Emit the normal disp32 encoding.
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(ModRMByte(2, RegOpcodeField, 4), CurByte, OS);
|
2010-02-05 02:18:40 +00:00
|
|
|
}
|
2010-02-05 06:16:07 +00:00
|
|
|
|
|
|
|
// Calculate what the SS field value should be...
|
|
|
|
static const unsigned SSTable[] = { ~0, 0, 1, ~0, 2, ~0, ~0, ~0, 3 };
|
|
|
|
unsigned SS = SSTable[Scale.getImm()];
|
|
|
|
|
|
|
|
if (BaseReg == 0) {
|
|
|
|
// Handle the SIB byte for the case where there is no base, see Intel
|
|
|
|
// Manual 2A, table 2-7. The displacement has already been output.
|
|
|
|
unsigned IndexRegNo;
|
|
|
|
if (IndexReg.getReg())
|
|
|
|
IndexRegNo = GetX86RegNum(IndexReg);
|
|
|
|
else // Examples: [ESP+1*<noreg>+4] or [scaled idx]+disp32 (MOD=0,BASE=5)
|
|
|
|
IndexRegNo = 4;
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitSIBByte(SS, IndexRegNo, 5, CurByte, OS);
|
2010-02-05 06:16:07 +00:00
|
|
|
} else {
|
|
|
|
unsigned IndexRegNo;
|
|
|
|
if (IndexReg.getReg())
|
|
|
|
IndexRegNo = GetX86RegNum(IndexReg);
|
|
|
|
else
|
|
|
|
IndexRegNo = 4; // For example [ESP+1*<noreg>+4]
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitSIBByte(SS, IndexRegNo, GetX86RegNum(Base), CurByte, OS);
|
2010-02-05 06:16:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// Do we need to output a displacement?
|
|
|
|
if (ForceDisp8)
|
2010-02-12 22:36:47 +00:00
|
|
|
EmitImmediate(Disp, 1, FK_Data_1, CurByte, OS, Fixups);
|
2010-02-10 06:30:00 +00:00
|
|
|
else if (ForceDisp32 || Disp.getImm() != 0)
|
2010-02-12 22:36:47 +00:00
|
|
|
EmitImmediate(Disp, 4, FK_Data_4, CurByte, OS, Fixups);
|
2010-02-05 02:18:40 +00:00
|
|
|
}
|
|
|
|
|
2010-02-05 22:10:22 +00:00
|
|
|
/// 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, unsigned TSFlags,
|
|
|
|
const TargetInstrDesc &Desc) {
|
2010-02-13 19:16:53 +00:00
|
|
|
// Pseudo instructions never have a rex byte.
|
|
|
|
if ((TSFlags & X86II::FormMask) == X86II::Pseudo)
|
|
|
|
return 0;
|
2010-02-05 22:10:22 +00:00
|
|
|
|
2010-02-11 22:39:10 +00:00
|
|
|
unsigned REX = 0;
|
2010-02-05 22:10:22 +00:00
|
|
|
if (TSFlags & X86II::REX_W)
|
|
|
|
REX |= 1 << 3;
|
|
|
|
|
|
|
|
if (MI.getNumOperands() == 0) return REX;
|
|
|
|
|
|
|
|
unsigned NumOps = MI.getNumOperands();
|
|
|
|
// FIXME: MCInst should explicitize the two-addrness.
|
|
|
|
bool isTwoAddr = NumOps > 1 &&
|
|
|
|
Desc.getOperandConstraint(1, TOI::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;
|
2010-02-05 22:48:33 +00:00
|
|
|
// FIXME: The caller of DetermineREXPrefix slaps this prefix onto anything
|
|
|
|
// that returns non-zero.
|
2010-02-05 22:10:22 +00:00
|
|
|
REX |= 0x40;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case X86II::MRMSrcMem: {
|
|
|
|
if (MI.getOperand(0).isReg() &&
|
|
|
|
X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(0).getReg()))
|
|
|
|
REX |= 1 << 2;
|
|
|
|
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;
|
|
|
|
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 ? X86AddrNumOperands+1 : X86AddrNumOperands);
|
|
|
|
i = isTwoAddr ? 1 : 0;
|
|
|
|
if (NumOps > e && MI.getOperand(e).isReg() &&
|
|
|
|
X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(e).getReg()))
|
|
|
|
REX |= 1 << 2;
|
|
|
|
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;
|
|
|
|
Bit++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
default:
|
|
|
|
if (MI.getOperand(0).isReg() &&
|
|
|
|
X86InstrInfo::isX86_64ExtendedReg(MI.getOperand(0).getReg()))
|
|
|
|
REX |= 1 << 0;
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return REX;
|
|
|
|
}
|
2010-02-03 21:43:43 +00:00
|
|
|
|
|
|
|
void X86MCCodeEmitter::
|
2010-02-09 22:59:55 +00:00
|
|
|
EncodeInstruction(const MCInst &MI, raw_ostream &OS,
|
|
|
|
SmallVectorImpl<MCFixup> &Fixups) const {
|
2010-02-03 21:43:43 +00:00
|
|
|
unsigned Opcode = MI.getOpcode();
|
|
|
|
const TargetInstrDesc &Desc = TII.get(Opcode);
|
2010-02-03 21:57:59 +00:00
|
|
|
unsigned TSFlags = Desc.TSFlags;
|
|
|
|
|
2010-02-10 06:41:02 +00:00
|
|
|
// Keep track of the current byte being emitted.
|
|
|
|
unsigned CurByte = 0;
|
|
|
|
|
2010-02-03 21:57:59 +00:00
|
|
|
// FIXME: We should emit the prefixes in exactly the same order as GAS does,
|
|
|
|
// in order to provide diffability.
|
|
|
|
|
2010-02-03 21:43:43 +00:00
|
|
|
// Emit the lock opcode prefix as needed.
|
2010-02-03 21:57:59 +00:00
|
|
|
if (TSFlags & X86II::LOCK)
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0xF0, CurByte, OS);
|
2010-02-03 21:43:43 +00:00
|
|
|
|
|
|
|
// Emit segment override opcode prefix as needed.
|
2010-02-03 21:57:59 +00:00
|
|
|
switch (TSFlags & X86II::SegOvrMask) {
|
2010-02-03 21:43:43 +00:00
|
|
|
default: assert(0 && "Invalid segment!");
|
|
|
|
case 0: break; // No segment override!
|
|
|
|
case X86II::FS:
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0x64, CurByte, OS);
|
2010-02-03 21:43:43 +00:00
|
|
|
break;
|
|
|
|
case X86II::GS:
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0x65, CurByte, OS);
|
2010-02-03 21:43:43 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2010-02-03 21:57:59 +00:00
|
|
|
// Emit the repeat opcode prefix as needed.
|
|
|
|
if ((TSFlags & X86II::Op0Mask) == X86II::REP)
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0xF3, CurByte, OS);
|
2010-02-03 21:57:59 +00:00
|
|
|
|
|
|
|
// Emit the operand size opcode prefix as needed.
|
|
|
|
if (TSFlags & X86II::OpSize)
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0x66, CurByte, OS);
|
2010-02-03 21:57:59 +00:00
|
|
|
|
|
|
|
// Emit the address size opcode prefix as needed.
|
|
|
|
if (TSFlags & X86II::AdSize)
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0x67, CurByte, OS);
|
2010-02-03 21:57:59 +00:00
|
|
|
|
|
|
|
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
|
|
|
|
Need0FPrefix = true;
|
|
|
|
break;
|
|
|
|
case X86II::TF: // F2 0F 38
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0xF2, CurByte, OS);
|
2010-02-03 21:57:59 +00:00
|
|
|
Need0FPrefix = true;
|
|
|
|
break;
|
|
|
|
case X86II::XS: // F3 0F
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0xF3, CurByte, OS);
|
2010-02-03 21:57:59 +00:00
|
|
|
Need0FPrefix = true;
|
|
|
|
break;
|
|
|
|
case X86II::XD: // F2 0F
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0xF2, CurByte, OS);
|
2010-02-03 21:57:59 +00:00
|
|
|
Need0FPrefix = true;
|
|
|
|
break;
|
2010-02-10 06:41:02 +00:00
|
|
|
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;
|
2010-02-03 21:57:59 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// Handle REX prefix.
|
2010-02-05 22:10:22 +00:00
|
|
|
// FIXME: Can this come before F2 etc to simplify emission?
|
2010-02-03 21:57:59 +00:00
|
|
|
if (Is64BitMode) {
|
2010-02-05 22:10:22 +00:00
|
|
|
if (unsigned REX = DetermineREXPrefix(MI, TSFlags, Desc))
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0x40 | REX, CurByte, OS);
|
2010-02-03 21:57:59 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// 0x0F escape code must be emitted just before the opcode.
|
|
|
|
if (Need0FPrefix)
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0x0F, CurByte, OS);
|
2010-02-03 21:43:43 +00:00
|
|
|
|
2010-02-03 21:57:59 +00:00
|
|
|
// 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
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0x38, CurByte, OS);
|
2010-02-03 21:57:59 +00:00
|
|
|
break;
|
|
|
|
case X86II::TA: // 0F 3A
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(0x3A, CurByte, OS);
|
2010-02-03 21:57:59 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
// If this is a two-address instruction, skip one of the register operands.
|
|
|
|
unsigned NumOps = Desc.getNumOperands();
|
|
|
|
unsigned CurOp = 0;
|
|
|
|
if (NumOps > 1 && Desc.getOperandConstraint(1, TOI::TIED_TO) != -1)
|
|
|
|
++CurOp;
|
|
|
|
else if (NumOps > 2 && Desc.getOperandConstraint(NumOps-1, TOI::TIED_TO)== 0)
|
|
|
|
// Skip the last source operand that is tied_to the dest reg. e.g. LXADD32
|
|
|
|
--NumOps;
|
|
|
|
|
2010-02-05 19:24:13 +00:00
|
|
|
unsigned char BaseOpcode = X86II::getBaseOpcodeFor(TSFlags);
|
2010-02-03 21:57:59 +00:00
|
|
|
switch (TSFlags & X86II::FormMask) {
|
2010-02-05 21:34:18 +00:00
|
|
|
case X86II::MRMInitReg:
|
|
|
|
assert(0 && "FIXME: Remove this form when the JIT moves to MCCodeEmitter!");
|
2010-02-05 02:18:40 +00:00
|
|
|
default: errs() << "FORM: " << (TSFlags & X86II::FormMask) << "\n";
|
2010-02-11 07:06:31 +00:00
|
|
|
assert(0 && "Unknown FormMask value in X86MCCodeEmitter!");
|
2010-02-13 19:16:53 +00:00
|
|
|
case X86II::Pseudo: return; // Pseudo instructions encode to nothing.
|
2010-02-11 07:06:31 +00:00
|
|
|
case X86II::RawFrm:
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
2010-02-05 01:53:19 +00:00
|
|
|
break;
|
|
|
|
|
2010-02-11 07:06:31 +00:00
|
|
|
case X86II::AddRegFrm:
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(BaseOpcode + GetX86RegNum(MI.getOperand(CurOp++)), CurByte, OS);
|
2010-02-03 21:57:59 +00:00
|
|
|
break;
|
2010-02-05 01:53:19 +00:00
|
|
|
|
|
|
|
case X86II::MRMDestReg:
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
2010-02-05 01:53:19 +00:00
|
|
|
EmitRegModRMByte(MI.getOperand(CurOp),
|
2010-02-10 06:41:02 +00:00
|
|
|
GetX86RegNum(MI.getOperand(CurOp+1)), CurByte, OS);
|
2010-02-05 01:53:19 +00:00
|
|
|
CurOp += 2;
|
|
|
|
break;
|
2010-02-05 02:18:40 +00:00
|
|
|
|
|
|
|
case X86II::MRMDestMem:
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
2010-02-05 02:18:40 +00:00
|
|
|
EmitMemModRMByte(MI, CurOp,
|
|
|
|
GetX86RegNum(MI.getOperand(CurOp + X86AddrNumOperands)),
|
2010-02-12 23:00:36 +00:00
|
|
|
TSFlags, CurByte, OS, Fixups);
|
2010-02-05 19:37:31 +00:00
|
|
|
CurOp += X86AddrNumOperands + 1;
|
2010-02-05 02:18:40 +00:00
|
|
|
break;
|
2010-02-05 19:04:37 +00:00
|
|
|
|
|
|
|
case X86II::MRMSrcReg:
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
2010-02-05 19:04:37 +00:00
|
|
|
EmitRegModRMByte(MI.getOperand(CurOp+1), GetX86RegNum(MI.getOperand(CurOp)),
|
2010-02-10 06:41:02 +00:00
|
|
|
CurByte, OS);
|
2010-02-05 19:04:37 +00:00
|
|
|
CurOp += 2;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case X86II::MRMSrcMem: {
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
2010-02-05 19:04:37 +00:00
|
|
|
|
|
|
|
// FIXME: Maybe lea should have its own form? This is a horrible hack.
|
|
|
|
int AddrOperands;
|
|
|
|
if (Opcode == X86::LEA64r || Opcode == X86::LEA64_32r ||
|
|
|
|
Opcode == X86::LEA16r || Opcode == X86::LEA32r)
|
|
|
|
AddrOperands = X86AddrNumOperands - 1; // No segment register
|
|
|
|
else
|
|
|
|
AddrOperands = X86AddrNumOperands;
|
|
|
|
|
|
|
|
EmitMemModRMByte(MI, CurOp+1, GetX86RegNum(MI.getOperand(CurOp)),
|
2010-02-12 23:00:36 +00:00
|
|
|
TSFlags, CurByte, OS, Fixups);
|
2010-02-05 19:04:37 +00:00
|
|
|
CurOp += AddrOperands + 1;
|
|
|
|
break;
|
|
|
|
}
|
2010-02-05 19:37:31 +00:00
|
|
|
|
|
|
|
case X86II::MRM0r: case X86II::MRM1r:
|
|
|
|
case X86II::MRM2r: case X86II::MRM3r:
|
|
|
|
case X86II::MRM4r: case X86II::MRM5r:
|
2010-02-11 07:06:31 +00:00
|
|
|
case X86II::MRM6r: case X86II::MRM7r:
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
2010-02-12 23:54:57 +00:00
|
|
|
EmitRegModRMByte(MI.getOperand(CurOp++),
|
|
|
|
(TSFlags & X86II::FormMask)-X86II::MRM0r,
|
|
|
|
CurByte, OS);
|
2010-02-05 19:37:31 +00:00
|
|
|
break;
|
|
|
|
case X86II::MRM0m: case X86II::MRM1m:
|
|
|
|
case X86II::MRM2m: case X86II::MRM3m:
|
|
|
|
case X86II::MRM4m: case X86II::MRM5m:
|
2010-02-11 07:06:31 +00:00
|
|
|
case X86II::MRM6m: case X86II::MRM7m:
|
2010-02-10 06:41:02 +00:00
|
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
2010-02-05 19:37:31 +00:00
|
|
|
EmitMemModRMByte(MI, CurOp, (TSFlags & X86II::FormMask)-X86II::MRM0m,
|
2010-02-12 23:00:36 +00:00
|
|
|
TSFlags, CurByte, OS, Fixups);
|
2010-02-05 19:37:31 +00:00
|
|
|
CurOp += X86AddrNumOperands;
|
|
|
|
break;
|
2010-02-12 02:06:33 +00:00
|
|
|
case X86II::MRM_C1:
|
|
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
|
|
EmitByte(0xC1, CurByte, OS);
|
|
|
|
break;
|
2010-02-13 00:41:14 +00:00
|
|
|
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;
|
2010-02-12 02:06:33 +00:00
|
|
|
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;
|
2010-02-13 00:41:14 +00:00
|
|
|
case X86II::MRM_F8:
|
|
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
|
|
EmitByte(0xF8, CurByte, OS);
|
|
|
|
break;
|
2010-02-13 03:42:24 +00:00
|
|
|
case X86II::MRM_F9:
|
|
|
|
EmitByte(BaseOpcode, CurByte, OS);
|
|
|
|
EmitByte(0xF9, CurByte, OS);
|
|
|
|
break;
|
2010-02-05 19:37:31 +00:00
|
|
|
}
|
2010-02-11 07:06:31 +00:00
|
|
|
|
|
|
|
// 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)
|
2010-02-12 22:36:47 +00:00
|
|
|
EmitImmediate(MI.getOperand(CurOp++),
|
|
|
|
X86II::getSizeOfImm(TSFlags), getImmFixupKind(TSFlags),
|
2010-02-11 07:06:31 +00:00
|
|
|
CurByte, OS, Fixups);
|
2010-02-05 01:53:19 +00:00
|
|
|
|
|
|
|
#ifndef NDEBUG
|
2010-02-05 19:37:31 +00:00
|
|
|
// FIXME: Verify.
|
|
|
|
if (/*!Desc.isVariadic() &&*/ CurOp != NumOps) {
|
2010-02-05 01:53:19 +00:00
|
|
|
errs() << "Cannot encode all operands of: ";
|
|
|
|
MI.dump();
|
|
|
|
errs() << '\n';
|
|
|
|
abort();
|
|
|
|
}
|
|
|
|
#endif
|
2010-02-03 21:24:49 +00:00
|
|
|
}
|