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
printInst(const MCInst * MI,uint64_t Address,StringRef Annot,const MCSubtargetInfo & STI,raw_ostream & O)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
printPCRelImmOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)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
printOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O,const char * Modifier)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
printSrcMemOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O,const char * Modifier)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
printIndRegOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)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
printPostIndRegOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)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
printCCOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)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