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//===-- MSP430MCCodeEmitter.cpp - Convert MSP430 code to machine code -----===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the MSP430MCCodeEmitter class.
//
//===----------------------------------------------------------------------===//
#include "MSP430.h"
#include "MCTargetDesc/MSP430MCTargetDesc.h"
#include "MCTargetDesc/MSP430FixupKinds.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixup.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/EndianStream.h"
#include "llvm/Support/raw_ostream.h"
#define DEBUG_TYPE "mccodeemitter"
namespace llvm {
class MSP430MCCodeEmitter : public MCCodeEmitter {
MCContext &Ctx;
MCInstrInfo const &MCII;
// Offset keeps track of current word number being emitted
// inside a particular instruction.
mutable unsigned Offset;
/// TableGen'erated function for getting the binary encoding for an
/// instruction.
uint64_t getBinaryCodeForInstr(const MCInst &MI,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
/// Returns the binary encoding of operands.
///
/// If an operand requires relocation, the relocation is recorded
/// and zero is returned.
unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
unsigned getMemOpValue(const MCInst &MI, unsigned Op,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
unsigned getPCRelImmOpValue(const MCInst &MI, unsigned Op,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
unsigned getCGImmOpValue(const MCInst &MI, unsigned Op,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
unsigned getCCOpValue(const MCInst &MI, unsigned Op,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
public:
MSP430MCCodeEmitter(MCContext &ctx, MCInstrInfo const &MCII)
: Ctx(ctx), MCII(MCII) {}
void encodeInstruction(const MCInst &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const override;
};
void MSP430MCCodeEmitter::encodeInstruction(const MCInst &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
// Get byte count of instruction.
unsigned Size = Desc.getSize();
// Initialize fixup offset
Offset = 2;
uint64_t BinaryOpCode = getBinaryCodeForInstr(MI, Fixups, STI);
size_t WordCount = Size / 2;
while (WordCount--) {
support::endian::write(OS, (uint16_t)BinaryOpCode, support::little);
BinaryOpCode >>= 16;
}
}
unsigned MSP430MCCodeEmitter::getMachineOpValue(const MCInst &MI,
const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
if (MO.isReg())
return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg());
if (MO.isImm()) {
Offset += 2;
return MO.getImm();
}
assert(MO.isExpr() && "Expected expr operand");
Fixups.push_back(MCFixup::create(Offset, MO.getExpr(),
static_cast<MCFixupKind>(MSP430::fixup_16_byte), MI.getLoc()));
Offset += 2;
return 0;
}
unsigned MSP430MCCodeEmitter::getMemOpValue(const MCInst &MI, unsigned Op,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO1 = MI.getOperand(Op);
assert(MO1.isReg() && "Register operand expected");
unsigned Reg = Ctx.getRegisterInfo()->getEncodingValue(MO1.getReg());
const MCOperand &MO2 = MI.getOperand(Op + 1);
if (MO2.isImm()) {
Offset += 2;
return ((unsigned)MO2.getImm() << 4) | Reg;
}
assert(MO2.isExpr() && "Expr operand expected");
MSP430::Fixups FixupKind;
switch (Reg) {
case 0:
FixupKind = MSP430::fixup_16_pcrel_byte;
break;
case 2:
FixupKind = MSP430::fixup_16_byte;
break;
default:
FixupKind = MSP430::fixup_16_byte;
break;
}
Fixups.push_back(MCFixup::create(Offset, MO2.getExpr(),
static_cast<MCFixupKind>(FixupKind), MI.getLoc()));
Offset += 2;
return Reg;
}
unsigned MSP430MCCodeEmitter::getPCRelImmOpValue(const MCInst &MI, unsigned Op,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(Op);
if (MO.isImm())
return MO.getImm();
assert(MO.isExpr() && "Expr operand expected");
Fixups.push_back(MCFixup::create(0, MO.getExpr(),
static_cast<MCFixupKind>(MSP430::fixup_10_pcrel), MI.getLoc()));
return 0;
}
unsigned MSP430MCCodeEmitter::getCGImmOpValue(const MCInst &MI, unsigned Op,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(Op);
assert(MO.isImm() && "Expr operand expected");
int64_t Imm = MO.getImm();
switch (Imm) {
default:
llvm_unreachable("Invalid immediate value");
case 4: return 0x22;
case 8: return 0x32;
case 0: return 0x03;
case 1: return 0x13;
case 2: return 0x23;
case -1: return 0x33;
}
}
unsigned MSP430MCCodeEmitter::getCCOpValue(const MCInst &MI, unsigned Op,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(Op);
assert(MO.isImm() && "Immediate operand expected");
switch (MO.getImm()) {
case MSP430CC::COND_NE: return 0;
case MSP430CC::COND_E: return 1;
case MSP430CC::COND_LO: return 2;
case MSP430CC::COND_HS: return 3;
case MSP430CC::COND_N: return 4;
case MSP430CC::COND_GE: return 5;
case MSP430CC::COND_L: return 6;
default:
llvm_unreachable("Unknown condition code");
}
}
MCCodeEmitter *createMSP430MCCodeEmitter(const MCInstrInfo &MCII,
const MCRegisterInfo &MRI,
MCContext &Ctx) {
return new MSP430MCCodeEmitter(Ctx, MCII);
}
#include "MSP430GenMCCodeEmitter.inc"
} // end of namespace llvm
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