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