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