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-exception 6 // 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" 20 using namespace llvm; 21 22 #define DEBUG_TYPE "asm-printer" 23 24 // Include the auto-generated portion of the assembly writer. 25 #define PRINT_ALIAS_INSTR 26 #include "MSP430GenAsmWriter.inc" 27 28 void MSP430InstPrinter::printRegName(raw_ostream &O, MCRegister Reg) { 29 O << getRegisterName(Reg); 30 } 31 32 void 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 40 void 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 55 void 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 69 void 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 first 75 76 // If the global address expression is a part of displacement field with a 77 // register base, we should not emit any prefix symbol here, e.g. 78 // mov.w &foo, r1 79 // vs 80 // mov.w glb(r1), r2 81 // 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 field 93 if ((Base.getReg() != MSP430::SR) && 94 (Base.getReg() != MSP430::PC)) 95 O << '(' << getRegisterName(Base.getReg()) << ')'; 96 } 97 98 void MSP430InstPrinter::printIndRegOperand(const MCInst *MI, unsigned OpNo, 99 raw_ostream &O) { 100 const MCOperand &Base = MI->getOperand(OpNo); 101 O << "@" << getRegisterName(Base.getReg()); 102 } 103 104 void MSP430InstPrinter::printPostIndRegOperand(const MCInst *MI, unsigned OpNo, 105 raw_ostream &O) { 106 const MCOperand &Base = MI->getOperand(OpNo); 107 O << "@" << getRegisterName(Base.getReg()) << "+"; 108 } 109 110 void 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