1 //===-- MipsELFObjectWriter.cpp - Mips ELF Writer -------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "MCTargetDesc/MipsBaseInfo.h"
11 #include "MCTargetDesc/MipsFixupKinds.h"
12 #include "MCTargetDesc/MipsMCTargetDesc.h"
13 #include "llvm/MC/MCAssembler.h"
14 #include "llvm/MC/MCELF.h"
15 #include "llvm/MC/MCELFObjectWriter.h"
16 #include "llvm/MC/MCExpr.h"
17 #include "llvm/MC/MCSection.h"
18 #include "llvm/MC/MCValue.h"
19 #include "llvm/Support/ErrorHandling.h"
25 class MipsELFObjectWriter : public MCELFObjectTargetWriter {
27 MipsELFObjectWriter(bool _is64Bit, uint8_t OSABI,
28 bool _isN64, bool IsLittleEndian);
30 virtual ~MipsELFObjectWriter();
32 unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
33 bool IsPCRel) const override;
34 bool needsRelocateWithSymbol(const MCSymbolData &SD,
35 unsigned Type) const override;
39 MipsELFObjectWriter::MipsELFObjectWriter(bool _is64Bit, uint8_t OSABI,
40 bool _isN64, bool IsLittleEndian)
41 : MCELFObjectTargetWriter(_is64Bit, OSABI, ELF::EM_MIPS,
42 /*HasRelocationAddend*/ (_isN64) ? true : false,
45 MipsELFObjectWriter::~MipsELFObjectWriter() {}
47 unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
50 // determine the type of the relocation
51 unsigned Type = (unsigned)ELF::R_MIPS_NONE;
52 unsigned Kind = (unsigned)Fixup.getKind();
56 llvm_unreachable("invalid fixup kind!");
58 Type = ELF::R_MIPS_32;
61 Type = ELF::R_MIPS_64;
65 Type = setRType((unsigned)ELF::R_MIPS_GPREL32, Type);
66 Type = setRType2((unsigned)ELF::R_MIPS_64, Type);
67 Type = setRType3((unsigned)ELF::R_MIPS_NONE, Type);
70 Type = ELF::R_MIPS_GPREL32;
72 case Mips::fixup_Mips_GPREL16:
73 Type = ELF::R_MIPS_GPREL16;
75 case Mips::fixup_Mips_26:
76 Type = ELF::R_MIPS_26;
78 case Mips::fixup_Mips_CALL16:
79 Type = ELF::R_MIPS_CALL16;
81 case Mips::fixup_Mips_GOT_Global:
82 case Mips::fixup_Mips_GOT_Local:
83 Type = ELF::R_MIPS_GOT16;
85 case Mips::fixup_Mips_HI16:
86 Type = ELF::R_MIPS_HI16;
88 case Mips::fixup_Mips_LO16:
89 Type = ELF::R_MIPS_LO16;
91 case Mips::fixup_Mips_TLSGD:
92 Type = ELF::R_MIPS_TLS_GD;
94 case Mips::fixup_Mips_GOTTPREL:
95 Type = ELF::R_MIPS_TLS_GOTTPREL;
97 case Mips::fixup_Mips_TPREL_HI:
98 Type = ELF::R_MIPS_TLS_TPREL_HI16;
100 case Mips::fixup_Mips_TPREL_LO:
101 Type = ELF::R_MIPS_TLS_TPREL_LO16;
103 case Mips::fixup_Mips_TLSLDM:
104 Type = ELF::R_MIPS_TLS_LDM;
106 case Mips::fixup_Mips_DTPREL_HI:
107 Type = ELF::R_MIPS_TLS_DTPREL_HI16;
109 case Mips::fixup_Mips_DTPREL_LO:
110 Type = ELF::R_MIPS_TLS_DTPREL_LO16;
112 case Mips::fixup_Mips_Branch_PCRel:
113 case Mips::fixup_Mips_PC16:
114 Type = ELF::R_MIPS_PC16;
116 case Mips::fixup_Mips_GOT_PAGE:
117 Type = ELF::R_MIPS_GOT_PAGE;
119 case Mips::fixup_Mips_GOT_OFST:
120 Type = ELF::R_MIPS_GOT_OFST;
122 case Mips::fixup_Mips_GOT_DISP:
123 Type = ELF::R_MIPS_GOT_DISP;
125 case Mips::fixup_Mips_GPOFF_HI:
126 Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
127 Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
128 Type = setRType3((unsigned)ELF::R_MIPS_HI16, Type);
130 case Mips::fixup_Mips_GPOFF_LO:
131 Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
132 Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
133 Type = setRType3((unsigned)ELF::R_MIPS_LO16, Type);
135 case Mips::fixup_Mips_HIGHER:
136 Type = ELF::R_MIPS_HIGHER;
138 case Mips::fixup_Mips_HIGHEST:
139 Type = ELF::R_MIPS_HIGHEST;
141 case Mips::fixup_Mips_GOT_HI16:
142 Type = ELF::R_MIPS_GOT_HI16;
144 case Mips::fixup_Mips_GOT_LO16:
145 Type = ELF::R_MIPS_GOT_LO16;
147 case Mips::fixup_Mips_CALL_HI16:
148 Type = ELF::R_MIPS_CALL_HI16;
150 case Mips::fixup_Mips_CALL_LO16:
151 Type = ELF::R_MIPS_CALL_LO16;
153 case Mips::fixup_MICROMIPS_26_S1:
154 Type = ELF::R_MICROMIPS_26_S1;
156 case Mips::fixup_MICROMIPS_HI16:
157 Type = ELF::R_MICROMIPS_HI16;
159 case Mips::fixup_MICROMIPS_LO16:
160 Type = ELF::R_MICROMIPS_LO16;
162 case Mips::fixup_MICROMIPS_GOT16:
163 Type = ELF::R_MICROMIPS_GOT16;
165 case Mips::fixup_MICROMIPS_PC7_S1:
166 Type = ELF::R_MICROMIPS_PC7_S1;
168 case Mips::fixup_MICROMIPS_PC16_S1:
169 Type = ELF::R_MICROMIPS_PC16_S1;
171 case Mips::fixup_MICROMIPS_CALL16:
172 Type = ELF::R_MICROMIPS_CALL16;
174 case Mips::fixup_MICROMIPS_GOT_DISP:
175 Type = ELF::R_MICROMIPS_GOT_DISP;
177 case Mips::fixup_MICROMIPS_GOT_PAGE:
178 Type = ELF::R_MICROMIPS_GOT_PAGE;
180 case Mips::fixup_MICROMIPS_GOT_OFST:
181 Type = ELF::R_MICROMIPS_GOT_OFST;
183 case Mips::fixup_MICROMIPS_TLS_GD:
184 Type = ELF::R_MICROMIPS_TLS_GD;
186 case Mips::fixup_MICROMIPS_TLS_LDM:
187 Type = ELF::R_MICROMIPS_TLS_LDM;
189 case Mips::fixup_MICROMIPS_TLS_DTPREL_HI16:
190 Type = ELF::R_MICROMIPS_TLS_DTPREL_HI16;
192 case Mips::fixup_MICROMIPS_TLS_DTPREL_LO16:
193 Type = ELF::R_MICROMIPS_TLS_DTPREL_LO16;
195 case Mips::fixup_MICROMIPS_TLS_TPREL_HI16:
196 Type = ELF::R_MICROMIPS_TLS_TPREL_HI16;
198 case Mips::fixup_MICROMIPS_TLS_TPREL_LO16:
199 Type = ELF::R_MICROMIPS_TLS_TPREL_LO16;
201 case Mips::fixup_MIPS_PC19_S2:
202 Type = ELF::R_MIPS_PC19_S2;
204 case Mips::fixup_MIPS_PC18_S3:
205 Type = ELF::R_MIPS_PC18_S3;
207 case Mips::fixup_MIPS_PC21_S2:
208 Type = ELF::R_MIPS_PC21_S2;
210 case Mips::fixup_MIPS_PC26_S2:
211 Type = ELF::R_MIPS_PC26_S2;
213 case Mips::fixup_MIPS_PCHI16:
214 Type = ELF::R_MIPS_PCHI16;
216 case Mips::fixup_MIPS_PCLO16:
217 Type = ELF::R_MIPS_PCLO16;
224 MipsELFObjectWriter::needsRelocateWithSymbol(const MCSymbolData &SD,
225 unsigned Type) const {
226 // FIXME: This is extremely conservative. This really needs to use a
227 // whitelist with a clear explanation for why each realocation needs to
228 // point to the symbol, not to the section.
233 case ELF::R_MIPS_GOT16:
234 case ELF::R_MIPS16_GOT16:
235 case ELF::R_MICROMIPS_GOT16:
236 llvm_unreachable("Should have been handled already");
238 // These relocations might be paired with another relocation. The pairing is
239 // done by the static linker by matching the symbol. Since we only see one
240 // relocation at a time, we have to force them to relocate with a symbol to
241 // avoid ending up with a pair where one points to a section and another
242 // points to a symbol.
243 case ELF::R_MIPS_HI16:
244 case ELF::R_MIPS16_HI16:
245 case ELF::R_MICROMIPS_HI16:
246 case ELF::R_MIPS_LO16:
247 case ELF::R_MIPS16_LO16:
248 case ELF::R_MICROMIPS_LO16:
252 if (MCELF::getOther(SD) & (ELF::STO_MIPS_MICROMIPS >> 2))
257 case ELF::R_MIPS_GPREL16:
262 MCObjectWriter *llvm::createMipsELFObjectWriter(raw_ostream &OS,
266 MCELFObjectTargetWriter *MOTW = new MipsELFObjectWriter(Is64Bit, OSABI,
267 (Is64Bit) ? true : false,
269 return createELFObjectWriter(MOTW, OS, IsLittleEndian);