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
printRegName(raw_ostream & O,MCRegister Reg) const29 void MSP430InstPrinter::printRegName(raw_ostream &O, MCRegister Reg) const {
30 O << getRegisterName(Reg);
31 }
32
printInst(const MCInst * MI,uint64_t Address,StringRef Annot,const MCSubtargetInfo & STI,raw_ostream & O)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
printPCRelImmOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)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
printOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O,const char * Modifier)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
printSrcMemOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O,const char * Modifier)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
printIndRegOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)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
printPostIndRegOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)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
printCCOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)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