1 //===-- MipsMCAsmInfo.cpp - Mips Asm Properties ---------------------------===//
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 file contains the declarations of the MipsMCAsmInfo properties.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "MipsMCAsmInfo.h"
14 #include "MipsABIInfo.h"
15 #include "llvm/MC/MCValue.h"
16 #include "llvm/Support/Casting.h"
17 #include "llvm/TargetParser/Triple.h"
18
19 using namespace llvm;
20
anchor()21 void MipsELFMCAsmInfo::anchor() {}
22
MipsELFMCAsmInfo(const Triple & TheTriple,const MCTargetOptions & Options)23 MipsELFMCAsmInfo::MipsELFMCAsmInfo(const Triple &TheTriple,
24 const MCTargetOptions &Options) {
25 IsLittleEndian = TheTriple.isLittleEndian();
26
27 MipsABIInfo ABI = MipsABIInfo::computeTargetABI(TheTriple, "", Options);
28
29 if (TheTriple.isMIPS64() && !ABI.IsN32())
30 CodePointerSize = CalleeSaveStackSlotSize = 8;
31
32 if (ABI.IsO32())
33 PrivateGlobalPrefix = "$";
34 else if (ABI.IsN32() || ABI.IsN64())
35 PrivateGlobalPrefix = ".L";
36 PrivateLabelPrefix = PrivateGlobalPrefix;
37
38 AlignmentIsInBytes = false;
39 Data16bitsDirective = "\t.2byte\t";
40 Data32bitsDirective = "\t.4byte\t";
41 Data64bitsDirective = "\t.8byte\t";
42 CommentString = "#";
43 AllowDollarAtStartOfIdentifier = false;
44 ZeroDirective = "\t.space\t";
45 UseAssignmentForEHBegin = true;
46 SupportsDebugInformation = true;
47 ExceptionsType = ExceptionHandling::DwarfCFI;
48 DwarfRegNumForCFI = true;
49 }
50
anchor()51 void MipsCOFFMCAsmInfo::anchor() {}
52
MipsCOFFMCAsmInfo()53 MipsCOFFMCAsmInfo::MipsCOFFMCAsmInfo() {
54 HasSingleParameterDotFile = true;
55 WinEHEncodingType = WinEH::EncodingType::Itanium;
56
57 ExceptionsType = ExceptionHandling::WinEH;
58
59 PrivateGlobalPrefix = ".L";
60 PrivateLabelPrefix = ".L";
61 AllowAtInName = true;
62 }
63
createGpOff(const MCExpr * Expr,Mips::Specifier S,MCContext & Ctx)64 const MCSpecifierExpr *Mips::createGpOff(const MCExpr *Expr, Mips::Specifier S,
65 MCContext &Ctx) {
66 Expr = MCSpecifierExpr::create(Expr, Mips::S_GPREL, Ctx);
67 Expr = MCSpecifierExpr::create(Expr, Mips::S_NEG, Ctx);
68 return MCSpecifierExpr::create(Expr, S, Ctx);
69 }
70
printImpl(const MCAsmInfo & MAI,raw_ostream & OS,const MCSpecifierExpr & Expr)71 static void printImpl(const MCAsmInfo &MAI, raw_ostream &OS,
72 const MCSpecifierExpr &Expr) {
73 int64_t AbsVal;
74
75 switch (Expr.getSpecifier()) {
76 case Mips::S_None:
77 case Mips::S_Special:
78 llvm_unreachable("Mips::S_None and MEK_Special are invalid");
79 break;
80 case Mips::S_DTPREL:
81 // Mips::S_DTPREL is used for marking TLS DIEExpr only
82 // and contains a regular sub-expression.
83 MAI.printExpr(OS, *Expr.getSubExpr());
84 return;
85 case Mips::S_CALL_HI16:
86 OS << "%call_hi";
87 break;
88 case Mips::S_CALL_LO16:
89 OS << "%call_lo";
90 break;
91 case Mips::S_DTPREL_HI:
92 OS << "%dtprel_hi";
93 break;
94 case Mips::S_DTPREL_LO:
95 OS << "%dtprel_lo";
96 break;
97 case Mips::S_GOT:
98 OS << "%got";
99 break;
100 case Mips::S_GOTTPREL:
101 OS << "%gottprel";
102 break;
103 case Mips::S_GOT_CALL:
104 OS << "%call16";
105 break;
106 case Mips::S_GOT_DISP:
107 OS << "%got_disp";
108 break;
109 case Mips::S_GOT_HI16:
110 OS << "%got_hi";
111 break;
112 case Mips::S_GOT_LO16:
113 OS << "%got_lo";
114 break;
115 case Mips::S_GOT_PAGE:
116 OS << "%got_page";
117 break;
118 case Mips::S_GOT_OFST:
119 OS << "%got_ofst";
120 break;
121 case Mips::S_GPREL:
122 OS << "%gp_rel";
123 break;
124 case Mips::S_HI:
125 OS << "%hi";
126 break;
127 case Mips::S_HIGHER:
128 OS << "%higher";
129 break;
130 case Mips::S_HIGHEST:
131 OS << "%highest";
132 break;
133 case Mips::S_LO:
134 OS << "%lo";
135 break;
136 case Mips::S_NEG:
137 OS << "%neg";
138 break;
139 case Mips::S_PCREL_HI16:
140 OS << "%pcrel_hi";
141 break;
142 case Mips::S_PCREL_LO16:
143 OS << "%pcrel_lo";
144 break;
145 case Mips::S_TLSGD:
146 OS << "%tlsgd";
147 break;
148 case Mips::S_TLSLDM:
149 OS << "%tlsldm";
150 break;
151 case Mips::S_TPREL_HI:
152 OS << "%tprel_hi";
153 break;
154 case Mips::S_TPREL_LO:
155 OS << "%tprel_lo";
156 break;
157 }
158
159 OS << '(';
160 if (Expr.evaluateAsAbsolute(AbsVal))
161 OS << AbsVal;
162 else
163 MAI.printExpr(OS, *Expr.getSubExpr());
164 OS << ')';
165 }
166
isGpOff(const MCSpecifierExpr & E)167 bool Mips::isGpOff(const MCSpecifierExpr &E) {
168 if (E.getSpecifier() == Mips::S_HI || E.getSpecifier() == Mips::S_LO) {
169 if (const auto *S1 = dyn_cast<const MCSpecifierExpr>(E.getSubExpr())) {
170 if (const auto *S2 = dyn_cast<const MCSpecifierExpr>(S1->getSubExpr())) {
171 if (S1->getSpecifier() == Mips::S_NEG &&
172 S2->getSpecifier() == Mips::S_GPREL) {
173 // S = E.getSpecifier();
174 return true;
175 }
176 }
177 }
178 }
179 return false;
180 }
181
evaluate(const MCSpecifierExpr & Expr,MCValue & Res,const MCAssembler * Asm)182 static bool evaluate(const MCSpecifierExpr &Expr, MCValue &Res,
183 const MCAssembler *Asm) {
184 // Look for the %hi(%neg(%gp_rel(X))) and %lo(%neg(%gp_rel(X)))
185 // special cases.
186 if (Mips::isGpOff(Expr)) {
187 const MCExpr *SubExpr =
188 cast<MCSpecifierExpr>(
189 cast<MCSpecifierExpr>(Expr.getSubExpr())->getSubExpr())
190 ->getSubExpr();
191 if (!SubExpr->evaluateAsRelocatable(Res, Asm))
192 return false;
193
194 Res.setSpecifier(Mips::S_Special);
195 return true;
196 }
197
198 if (!Expr.getSubExpr()->evaluateAsRelocatable(Res, Asm))
199 return false;
200 Res.setSpecifier(Expr.getSpecifier());
201 return !Res.getSubSym();
202 }
203
printSpecifierExpr(raw_ostream & OS,const MCSpecifierExpr & Expr) const204 void MipsELFMCAsmInfo::printSpecifierExpr(raw_ostream &OS,
205 const MCSpecifierExpr &Expr) const {
206 printImpl(*this, OS, Expr);
207 }
208
evaluateAsRelocatableImpl(const MCSpecifierExpr & Expr,MCValue & Res,const MCAssembler * Asm) const209 bool MipsELFMCAsmInfo::evaluateAsRelocatableImpl(const MCSpecifierExpr &Expr,
210 MCValue &Res,
211 const MCAssembler *Asm) const {
212 return evaluate(Expr, Res, Asm);
213 }
214
printSpecifierExpr(raw_ostream & OS,const MCSpecifierExpr & Expr) const215 void MipsCOFFMCAsmInfo::printSpecifierExpr(raw_ostream &OS,
216 const MCSpecifierExpr &Expr) const {
217 printImpl(*this, OS, Expr);
218 }
219
evaluateAsRelocatableImpl(const MCSpecifierExpr & Expr,MCValue & Res,const MCAssembler * Asm) const220 bool MipsCOFFMCAsmInfo::evaluateAsRelocatableImpl(
221 const MCSpecifierExpr &Expr, MCValue &Res, const MCAssembler *Asm) const {
222 return evaluate(Expr, Res, Asm);
223 }
224