222 lines
7.1 KiB
C++
222 lines
7.1 KiB
C++
//===-- MBlazeMCCodeEmitter.cpp - Convert MBlaze code to machine code -----===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the MBlazeMCCodeEmitter class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "mccodeemitter"
|
|
#include "MCTargetDesc/MBlazeBaseInfo.h"
|
|
#include "MCTargetDesc/MBlazeMCTargetDesc.h"
|
|
#include "llvm/MC/MCCodeEmitter.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
#include "llvm/MC/MCInstrInfo.h"
|
|
#include "llvm/MC/MCSubtargetInfo.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/MC/MCFixup.h"
|
|
#include "llvm/ADT/Statistic.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
using namespace llvm;
|
|
|
|
STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
|
|
|
|
namespace {
|
|
class MBlazeMCCodeEmitter : public MCCodeEmitter {
|
|
MBlazeMCCodeEmitter(const MBlazeMCCodeEmitter &); // DO NOT IMPLEMENT
|
|
void operator=(const MBlazeMCCodeEmitter &); // DO NOT IMPLEMENT
|
|
const MCInstrInfo &MCII;
|
|
|
|
public:
|
|
MBlazeMCCodeEmitter(const MCInstrInfo &mcii, const MCSubtargetInfo &sti,
|
|
MCContext &ctx)
|
|
: MCII(mcii) {
|
|
}
|
|
|
|
~MBlazeMCCodeEmitter() {}
|
|
|
|
// getBinaryCodeForInstr - TableGen'erated function for getting the
|
|
// binary encoding for an instruction.
|
|
uint64_t getBinaryCodeForInstr(const MCInst &MI) const;
|
|
|
|
/// getMachineOpValue - Return binary encoding of operand. If the machine
|
|
/// operand requires relocation, record the relocation and return zero.
|
|
unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO) const;
|
|
unsigned getMachineOpValue(const MCInst &MI, unsigned OpIdx) const {
|
|
return getMachineOpValue(MI, MI.getOperand(OpIdx));
|
|
}
|
|
|
|
static unsigned GetMBlazeRegNum(const MCOperand &MO) {
|
|
// FIXME: getMBlazeRegisterNumbering() is sufficient?
|
|
llvm_unreachable("MBlazeMCCodeEmitter::GetMBlazeRegNum() not yet "
|
|
"implemented.");
|
|
}
|
|
|
|
void EmitByte(unsigned char C, unsigned &CurByte, raw_ostream &OS) const {
|
|
// The MicroBlaze uses a bit reversed format so we need to reverse the
|
|
// order of the bits. Taken from:
|
|
// http://graphics.stanford.edu/~seander/bithacks.html
|
|
C = ((C * 0x80200802ULL) & 0x0884422110ULL) * 0x0101010101ULL >> 32;
|
|
|
|
OS << (char)C;
|
|
++CurByte;
|
|
}
|
|
|
|
void EmitRawByte(unsigned char C, unsigned &CurByte, raw_ostream &OS) const {
|
|
OS << (char)C;
|
|
++CurByte;
|
|
}
|
|
|
|
void EmitConstant(uint64_t Val, unsigned Size, unsigned &CurByte,
|
|
raw_ostream &OS) const {
|
|
assert(Size <= 8 && "size too big in emit constant");
|
|
|
|
for (unsigned i = 0; i != Size; ++i) {
|
|
EmitByte(Val & 255, CurByte, OS);
|
|
Val >>= 8;
|
|
}
|
|
}
|
|
|
|
void EmitIMM(const MCOperand &imm, unsigned &CurByte, raw_ostream &OS) const;
|
|
void EmitIMM(const MCInst &MI, unsigned &CurByte, raw_ostream &OS) const;
|
|
|
|
void EmitImmediate(const MCInst &MI, unsigned opNo, bool pcrel,
|
|
unsigned &CurByte, raw_ostream &OS,
|
|
SmallVectorImpl<MCFixup> &Fixups) const;
|
|
|
|
void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
|
|
SmallVectorImpl<MCFixup> &Fixups) const;
|
|
};
|
|
|
|
} // end anonymous namespace
|
|
|
|
|
|
MCCodeEmitter *llvm::createMBlazeMCCodeEmitter(const MCInstrInfo &MCII,
|
|
const MCSubtargetInfo &STI,
|
|
MCContext &Ctx) {
|
|
return new MBlazeMCCodeEmitter(MCII, STI, Ctx);
|
|
}
|
|
|
|
/// getMachineOpValue - Return binary encoding of operand. If the machine
|
|
/// operand requires relocation, record the relocation and return zero.
|
|
unsigned MBlazeMCCodeEmitter::getMachineOpValue(const MCInst &MI,
|
|
const MCOperand &MO) const {
|
|
if (MO.isReg())
|
|
return getMBlazeRegisterNumbering(MO.getReg());
|
|
if (MO.isImm())
|
|
return static_cast<unsigned>(MO.getImm());
|
|
if (MO.isExpr())
|
|
return 0; // The relocation has already been recorded at this point.
|
|
#ifndef NDEBUG
|
|
errs() << MO;
|
|
#endif
|
|
llvm_unreachable(0);
|
|
}
|
|
|
|
void MBlazeMCCodeEmitter::
|
|
EmitIMM(const MCOperand &imm, unsigned &CurByte, raw_ostream &OS) const {
|
|
int32_t val = (int32_t)imm.getImm();
|
|
if (val > 32767 || val < -32768) {
|
|
EmitByte(0x0D, CurByte, OS);
|
|
EmitByte(0x00, CurByte, OS);
|
|
EmitRawByte((val >> 24) & 0xFF, CurByte, OS);
|
|
EmitRawByte((val >> 16) & 0xFF, CurByte, OS);
|
|
}
|
|
}
|
|
|
|
void MBlazeMCCodeEmitter::
|
|
EmitIMM(const MCInst &MI, unsigned &CurByte,raw_ostream &OS) const {
|
|
switch (MI.getOpcode()) {
|
|
default: break;
|
|
|
|
case MBlaze::ADDIK32:
|
|
case MBlaze::ORI32:
|
|
case MBlaze::BRLID32:
|
|
EmitByte(0x0D, CurByte, OS);
|
|
EmitByte(0x00, CurByte, OS);
|
|
EmitRawByte(0, CurByte, OS);
|
|
EmitRawByte(0, CurByte, OS);
|
|
}
|
|
}
|
|
|
|
void MBlazeMCCodeEmitter::
|
|
EmitImmediate(const MCInst &MI, unsigned opNo, bool pcrel, unsigned &CurByte,
|
|
raw_ostream &OS, SmallVectorImpl<MCFixup> &Fixups) const {
|
|
assert(MI.getNumOperands()>opNo && "Not enought operands for instruction");
|
|
|
|
MCOperand oper = MI.getOperand(opNo);
|
|
|
|
if (oper.isImm()) {
|
|
EmitIMM(oper, CurByte, OS);
|
|
} else if (oper.isExpr()) {
|
|
MCFixupKind FixupKind;
|
|
switch (MI.getOpcode()) {
|
|
default:
|
|
FixupKind = pcrel ? FK_PCRel_2 : FK_Data_2;
|
|
Fixups.push_back(MCFixup::Create(0,oper.getExpr(),FixupKind));
|
|
break;
|
|
case MBlaze::ORI32:
|
|
case MBlaze::ADDIK32:
|
|
case MBlaze::BRLID32:
|
|
FixupKind = pcrel ? FK_PCRel_4 : FK_Data_4;
|
|
Fixups.push_back(MCFixup::Create(0,oper.getExpr(),FixupKind));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void MBlazeMCCodeEmitter::
|
|
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;
|
|
// Keep track of the current byte being emitted.
|
|
unsigned CurByte = 0;
|
|
|
|
// Emit an IMM instruction if the instruction we are encoding requires it
|
|
EmitIMM(MI,CurByte,OS);
|
|
|
|
switch ((TSFlags & MBlazeII::FormMask)) {
|
|
default: break;
|
|
case MBlazeII::FPseudo:
|
|
// Pseudo instructions don't get encoded.
|
|
return;
|
|
case MBlazeII::FRRI:
|
|
EmitImmediate(MI, 2, false, CurByte, OS, Fixups);
|
|
break;
|
|
case MBlazeII::FRIR:
|
|
EmitImmediate(MI, 1, false, CurByte, OS, Fixups);
|
|
break;
|
|
case MBlazeII::FCRI:
|
|
EmitImmediate(MI, 1, true, CurByte, OS, Fixups);
|
|
break;
|
|
case MBlazeII::FRCI:
|
|
EmitImmediate(MI, 1, true, CurByte, OS, Fixups);
|
|
case MBlazeII::FCCI:
|
|
EmitImmediate(MI, 0, true, CurByte, OS, Fixups);
|
|
break;
|
|
}
|
|
|
|
++MCNumEmitted; // Keep track of the # of mi's emitted
|
|
unsigned Value = getBinaryCodeForInstr(MI);
|
|
EmitConstant(Value, 4, CurByte, OS);
|
|
}
|
|
|
|
// FIXME: These #defines shouldn't be necessary. Instead, tblgen should
|
|
// be able to generate code emitter helpers for either variant, like it
|
|
// does for the AsmWriter.
|
|
#define MBlazeCodeEmitter MBlazeMCCodeEmitter
|
|
#define MachineInstr MCInst
|
|
#include "MBlazeGenCodeEmitter.inc"
|
|
#undef MBlazeCodeEmitter
|
|
#undef MachineInstr
|