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 #include "llvm/Support/FormattedStream.h" 21 using namespace llvm; 22 23 #define DEBUG_TYPE "asm-printer" 24 25 // Include the auto-generated portion of the assembly writer. 26 #define PRINT_ALIAS_INSTR 27 #include "MSP430GenAsmWriter.inc" 28 29 void MSP430InstPrinter::printRegName(raw_ostream &O, MCRegister Reg) const { 30 O << getRegisterName(Reg); 31 } 32 33 void MSP430InstPrinter::printInst(const MCInst *MI, uint64_t Address, 34 StringRef Annot, const MCSubtargetInfo &STI, 35 raw_ostream &O) { 36 if (!printAliasInstr(MI, Address, O)) 37 printInstruction(MI, Address, O); 38 printAnnotation(O, Annot); 39 } 40 41 void MSP430InstPrinter::printPCRelImmOperand(const MCInst *MI, unsigned OpNo, 42 raw_ostream &O) { 43 const MCOperand &Op = MI->getOperand(OpNo); 44 if (Op.isImm()) { 45 int64_t Imm = Op.getImm() * 2 + 2; 46 O << "$"; 47 if (Imm >= 0) 48 O << '+'; 49 O << Imm; 50 } else { 51 assert(Op.isExpr() && "unknown pcrel immediate operand"); 52 Op.getExpr()->print(O, &MAI); 53 } 54 } 55 56 void MSP430InstPrinter::printOperand(const MCInst *MI, unsigned OpNo, 57 raw_ostream &O, const char *Modifier) { 58 assert((Modifier == nullptr || Modifier[0] == 0) && "No modifiers supported"); 59 const MCOperand &Op = MI->getOperand(OpNo); 60 if (Op.isReg()) { 61 O << getRegisterName(Op.getReg()); 62 } else if (Op.isImm()) { 63 O << '#' << Op.getImm(); 64 } else { 65 assert(Op.isExpr() && "unknown operand kind in printOperand"); 66 O << '#'; 67 Op.getExpr()->print(O, &MAI); 68 } 69 } 70 71 void MSP430InstPrinter::printSrcMemOperand(const MCInst *MI, unsigned OpNo, 72 raw_ostream &O, 73 const char *Modifier) { 74 const MCOperand &Base = MI->getOperand(OpNo); 75 const MCOperand &Disp = MI->getOperand(OpNo+1); 76 77 // Print displacement first 78 79 // If the global address expression is a part of displacement field with a 80 // register base, we should not emit any prefix symbol here, e.g. 81 // mov.w &foo, r1 82 // vs 83 // mov.w glb(r1), r2 84 // Otherwise (!) msp430-as will silently miscompile the output :( 85 if (Base.getReg() == MSP430::SR) 86 O << '&'; 87 88 if (Disp.isExpr()) 89 Disp.getExpr()->print(O, &MAI); 90 else { 91 assert(Disp.isImm() && "Expected immediate in displacement field"); 92 O << Disp.getImm(); 93 } 94 95 // Print register base field 96 if ((Base.getReg() != MSP430::SR) && 97 (Base.getReg() != MSP430::PC)) 98 O << '(' << getRegisterName(Base.getReg()) << ')'; 99 } 100 101 void MSP430InstPrinter::printIndRegOperand(const MCInst *MI, unsigned OpNo, 102 raw_ostream &O) { 103 const MCOperand &Base = MI->getOperand(OpNo); 104 O << "@" << getRegisterName(Base.getReg()); 105 } 106 107 void MSP430InstPrinter::printPostIndRegOperand(const MCInst *MI, unsigned OpNo, 108 raw_ostream &O) { 109 const MCOperand &Base = MI->getOperand(OpNo); 110 O << "@" << getRegisterName(Base.getReg()) << "+"; 111 } 112 113 void MSP430InstPrinter::printCCOperand(const MCInst *MI, unsigned OpNo, 114 raw_ostream &O) { 115 unsigned CC = MI->getOperand(OpNo).getImm(); 116 117 switch (CC) { 118 default: 119 llvm_unreachable("Unsupported CC code"); 120 case MSP430CC::COND_E: 121 O << "eq"; 122 break; 123 case MSP430CC::COND_NE: 124 O << "ne"; 125 break; 126 case MSP430CC::COND_HS: 127 O << "hs"; 128 break; 129 case MSP430CC::COND_LO: 130 O << "lo"; 131 break; 132 case MSP430CC::COND_GE: 133 O << "ge"; 134 break; 135 case MSP430CC::COND_L: 136 O << 'l'; 137 break; 138 case MSP430CC::COND_N: 139 O << 'n'; 140 break; 141 } 142 } 143