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/MCELFObjectWriter.h"
15 #include "llvm/MC/MCExpr.h"
16 #include "llvm/MC/MCSection.h"
17 #include "llvm/MC/MCValue.h"
18 #include "llvm/Support/ErrorHandling.h"
24 class MipsELFObjectWriter : public MCELFObjectTargetWriter {
26 MipsELFObjectWriter(bool _is64Bit, uint8_t OSABI,
27 bool _isN64, bool IsLittleEndian);
29 virtual ~MipsELFObjectWriter();
31 unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
32 bool IsPCRel) const override;
33 bool needsRelocateWithSymbol(const MCSymbolData &SD,
34 unsigned Type) const override;
38 MipsELFObjectWriter::MipsELFObjectWriter(bool _is64Bit, uint8_t OSABI,
39 bool _isN64, bool IsLittleEndian)
40 : MCELFObjectTargetWriter(_is64Bit, OSABI, ELF::EM_MIPS,
41 /*HasRelocationAddend*/ (_isN64) ? true : false,
44 MipsELFObjectWriter::~MipsELFObjectWriter() {}
46 unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
49 // determine the type of the relocation
50 unsigned Type = (unsigned)ELF::R_MIPS_NONE;
51 unsigned Kind = (unsigned)Fixup.getKind();
55 llvm_unreachable("invalid fixup kind!");
57 Type = ELF::R_MIPS_32;
60 Type = ELF::R_MIPS_64;
64 Type = setRType((unsigned)ELF::R_MIPS_GPREL32, Type);
65 Type = setRType2((unsigned)ELF::R_MIPS_64, Type);
66 Type = setRType3((unsigned)ELF::R_MIPS_NONE, Type);
69 Type = ELF::R_MIPS_GPREL32;
71 case Mips::fixup_Mips_GPREL16:
72 Type = ELF::R_MIPS_GPREL16;
74 case Mips::fixup_Mips_26:
75 Type = ELF::R_MIPS_26;
77 case Mips::fixup_Mips_CALL16:
78 Type = ELF::R_MIPS_CALL16;
80 case Mips::fixup_Mips_GOT_Global:
81 case Mips::fixup_Mips_GOT_Local:
82 Type = ELF::R_MIPS_GOT16;
84 case Mips::fixup_Mips_HI16:
85 Type = ELF::R_MIPS_HI16;
87 case Mips::fixup_Mips_LO16:
88 Type = ELF::R_MIPS_LO16;
90 case Mips::fixup_Mips_TLSGD:
91 Type = ELF::R_MIPS_TLS_GD;
93 case Mips::fixup_Mips_GOTTPREL:
94 Type = ELF::R_MIPS_TLS_GOTTPREL;
96 case Mips::fixup_Mips_TPREL_HI:
97 Type = ELF::R_MIPS_TLS_TPREL_HI16;
99 case Mips::fixup_Mips_TPREL_LO:
100 Type = ELF::R_MIPS_TLS_TPREL_LO16;
102 case Mips::fixup_Mips_TLSLDM:
103 Type = ELF::R_MIPS_TLS_LDM;
105 case Mips::fixup_Mips_DTPREL_HI:
106 Type = ELF::R_MIPS_TLS_DTPREL_HI16;
108 case Mips::fixup_Mips_DTPREL_LO:
109 Type = ELF::R_MIPS_TLS_DTPREL_LO16;
111 case Mips::fixup_Mips_Branch_PCRel:
112 case Mips::fixup_Mips_PC16:
113 Type = ELF::R_MIPS_PC16;
115 case Mips::fixup_Mips_GOT_PAGE:
116 Type = ELF::R_MIPS_GOT_PAGE;
118 case Mips::fixup_Mips_GOT_OFST:
119 Type = ELF::R_MIPS_GOT_OFST;
121 case Mips::fixup_Mips_GOT_DISP:
122 Type = ELF::R_MIPS_GOT_DISP;
124 case Mips::fixup_Mips_GPOFF_HI:
125 Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
126 Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
127 Type = setRType3((unsigned)ELF::R_MIPS_HI16, Type);
129 case Mips::fixup_Mips_GPOFF_LO:
130 Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
131 Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
132 Type = setRType3((unsigned)ELF::R_MIPS_LO16, Type);
134 case Mips::fixup_Mips_HIGHER:
135 Type = ELF::R_MIPS_HIGHER;
137 case Mips::fixup_Mips_HIGHEST:
138 Type = ELF::R_MIPS_HIGHEST;
140 case Mips::fixup_Mips_GOT_HI16:
141 Type = ELF::R_MIPS_GOT_HI16;
143 case Mips::fixup_Mips_GOT_LO16:
144 Type = ELF::R_MIPS_GOT_LO16;
146 case Mips::fixup_Mips_CALL_HI16:
147 Type = ELF::R_MIPS_CALL_HI16;
149 case Mips::fixup_Mips_CALL_LO16:
150 Type = ELF::R_MIPS_CALL_LO16;
152 case Mips::fixup_MICROMIPS_26_S1:
153 Type = ELF::R_MICROMIPS_26_S1;
155 case Mips::fixup_MICROMIPS_HI16:
156 Type = ELF::R_MICROMIPS_HI16;
158 case Mips::fixup_MICROMIPS_LO16:
159 Type = ELF::R_MICROMIPS_LO16;
161 case Mips::fixup_MICROMIPS_GOT16:
162 Type = ELF::R_MICROMIPS_GOT16;
164 case Mips::fixup_MICROMIPS_PC16_S1:
165 Type = ELF::R_MICROMIPS_PC16_S1;
167 case Mips::fixup_MICROMIPS_CALL16:
168 Type = ELF::R_MICROMIPS_CALL16;
170 case Mips::fixup_MICROMIPS_GOT_DISP:
171 Type = ELF::R_MICROMIPS_GOT_DISP;
173 case Mips::fixup_MICROMIPS_GOT_PAGE:
174 Type = ELF::R_MICROMIPS_GOT_PAGE;
176 case Mips::fixup_MICROMIPS_GOT_OFST:
177 Type = ELF::R_MICROMIPS_GOT_OFST;
179 case Mips::fixup_MICROMIPS_TLS_GD:
180 Type = ELF::R_MICROMIPS_TLS_GD;
182 case Mips::fixup_MICROMIPS_TLS_LDM:
183 Type = ELF::R_MICROMIPS_TLS_LDM;
185 case Mips::fixup_MICROMIPS_TLS_DTPREL_HI16:
186 Type = ELF::R_MICROMIPS_TLS_DTPREL_HI16;
188 case Mips::fixup_MICROMIPS_TLS_DTPREL_LO16:
189 Type = ELF::R_MICROMIPS_TLS_DTPREL_LO16;
191 case Mips::fixup_MICROMIPS_TLS_TPREL_HI16:
192 Type = ELF::R_MICROMIPS_TLS_TPREL_HI16;
194 case Mips::fixup_MICROMIPS_TLS_TPREL_LO16:
195 Type = ELF::R_MICROMIPS_TLS_TPREL_LO16;
197 case Mips::fixup_MIPS_PC19_S2:
198 Type = ELF::R_MIPS_PC19_S2;
200 case Mips::fixup_MIPS_PC18_S3:
201 Type = ELF::R_MIPS_PC18_S3;
203 case Mips::fixup_MIPS_PC21_S2:
204 Type = ELF::R_MIPS_PC21_S2;
206 case Mips::fixup_MIPS_PC26_S2:
207 Type = ELF::R_MIPS_PC26_S2;
209 case Mips::fixup_MIPS_PCHI16:
210 Type = ELF::R_MIPS_PCHI16;
212 case Mips::fixup_MIPS_PCLO16:
213 Type = ELF::R_MIPS_PCLO16;
220 MipsELFObjectWriter::needsRelocateWithSymbol(const MCSymbolData &SD,
221 unsigned Type) const {
222 // FIXME: This is extremelly conservative. This really needs to use a
223 // whitelist with a clear explanation for why each realocation needs to
224 // point to the symbol, not to the section.
229 case ELF::R_MIPS_GOT16:
230 case ELF::R_MIPS16_GOT16:
231 case ELF::R_MICROMIPS_GOT16:
232 llvm_unreachable("Should have been handled already");
234 // These relocations might be paired with another relocation. The pairing is
235 // done by the static linker by matching the symbol. Since we only see one
236 // relocation at a time, we have to force them to relocate with a symbol to
237 // avoid ending up with a pair where one points to a section and another
238 // points to a symbol.
239 case ELF::R_MIPS_HI16:
240 case ELF::R_MIPS16_HI16:
241 case ELF::R_MICROMIPS_HI16:
242 case ELF::R_MIPS_LO16:
243 case ELF::R_MIPS16_LO16:
244 case ELF::R_MICROMIPS_LO16:
250 case ELF::R_MIPS_GPREL16:
255 MCObjectWriter *llvm::createMipsELFObjectWriter(raw_ostream &OS,
259 MCELFObjectTargetWriter *MOTW = new MipsELFObjectWriter(Is64Bit, OSABI,
260 (Is64Bit) ? true : false,
262 return createELFObjectWriter(MOTW, OS, IsLittleEndian);