140 lines · cpp
1//===-- MSP430InstPrinter.cpp - Convert MSP430 MCInst to assembly syntax --===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8//9// This class prints an MSP430 MCInst to a .s file.10//11//===----------------------------------------------------------------------===//12 13#include "MSP430InstPrinter.h"14#include "MSP430.h"15#include "llvm/MC/MCAsmInfo.h"16#include "llvm/MC/MCExpr.h"17#include "llvm/MC/MCInst.h"18#include "llvm/MC/MCInstrInfo.h"19#include "llvm/Support/ErrorHandling.h"20using namespace llvm;21 22#define DEBUG_TYPE "asm-printer"23 24// Include the auto-generated portion of the assembly writer.25#define PRINT_ALIAS_INSTR26#include "MSP430GenAsmWriter.inc"27 28void MSP430InstPrinter::printRegName(raw_ostream &O, MCRegister Reg) {29 O << getRegisterName(Reg);30}31 32void MSP430InstPrinter::printInst(const MCInst *MI, uint64_t Address,33 StringRef Annot, const MCSubtargetInfo &STI,34 raw_ostream &O) {35 if (!printAliasInstr(MI, Address, O))36 printInstruction(MI, Address, O);37 printAnnotation(O, Annot);38}39 40void MSP430InstPrinter::printPCRelImmOperand(const MCInst *MI, unsigned OpNo,41 raw_ostream &O) {42 const MCOperand &Op = MI->getOperand(OpNo);43 if (Op.isImm()) {44 int64_t Imm = Op.getImm() * 2 + 2;45 O << "$";46 if (Imm >= 0)47 O << '+';48 O << Imm;49 } else {50 assert(Op.isExpr() && "unknown pcrel immediate operand");51 MAI.printExpr(O, *Op.getExpr());52 }53}54 55void MSP430InstPrinter::printOperand(const MCInst *MI, unsigned OpNo,56 raw_ostream &O) {57 const MCOperand &Op = MI->getOperand(OpNo);58 if (Op.isReg()) {59 O << getRegisterName(Op.getReg());60 } else if (Op.isImm()) {61 O << '#' << Op.getImm();62 } else {63 assert(Op.isExpr() && "unknown operand kind in printOperand");64 O << '#';65 MAI.printExpr(O, *Op.getExpr());66 }67}68 69void MSP430InstPrinter::printSrcMemOperand(const MCInst *MI, unsigned OpNo,70 raw_ostream &O) {71 const MCOperand &Base = MI->getOperand(OpNo);72 const MCOperand &Disp = MI->getOperand(OpNo+1);73 74 // Print displacement first75 76 // If the global address expression is a part of displacement field with a77 // register base, we should not emit any prefix symbol here, e.g.78 // mov.w &foo, r179 // vs80 // mov.w glb(r1), r281 // Otherwise (!) msp430-as will silently miscompile the output :(82 if (Base.getReg() == MSP430::SR)83 O << '&';84 85 if (Disp.isExpr())86 MAI.printExpr(O, *Disp.getExpr());87 else {88 assert(Disp.isImm() && "Expected immediate in displacement field");89 O << Disp.getImm();90 }91 92 // Print register base field93 if ((Base.getReg() != MSP430::SR) &&94 (Base.getReg() != MSP430::PC))95 O << '(' << getRegisterName(Base.getReg()) << ')';96}97 98void MSP430InstPrinter::printIndRegOperand(const MCInst *MI, unsigned OpNo,99 raw_ostream &O) {100 const MCOperand &Base = MI->getOperand(OpNo);101 O << "@" << getRegisterName(Base.getReg());102}103 104void MSP430InstPrinter::printPostIndRegOperand(const MCInst *MI, unsigned OpNo,105 raw_ostream &O) {106 const MCOperand &Base = MI->getOperand(OpNo);107 O << "@" << getRegisterName(Base.getReg()) << "+";108}109 110void MSP430InstPrinter::printCCOperand(const MCInst *MI, unsigned OpNo,111 raw_ostream &O) {112 unsigned CC = MI->getOperand(OpNo).getImm();113 114 switch (CC) {115 default:116 llvm_unreachable("Unsupported CC code");117 case MSP430CC::COND_E:118 O << "eq";119 break;120 case MSP430CC::COND_NE:121 O << "ne";122 break;123 case MSP430CC::COND_HS:124 O << "hs";125 break;126 case MSP430CC::COND_LO:127 O << "lo";128 break;129 case MSP430CC::COND_GE:130 O << "ge";131 break;132 case MSP430CC::COND_L:133 O << 'l';134 break;135 case MSP430CC::COND_N:136 O << 'n';137 break;138 }139}140