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(unsigned Type) const override;
37 MipsELFObjectWriter::MipsELFObjectWriter(bool _is64Bit, uint8_t OSABI,
38 bool _isN64, bool IsLittleEndian)
39 : MCELFObjectTargetWriter(_is64Bit, OSABI, ELF::EM_MIPS,
40 /*HasRelocationAddend*/ (_isN64) ? true : false,
43 MipsELFObjectWriter::~MipsELFObjectWriter() {}
45 unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
48 // determine the type of the relocation
49 unsigned Type = (unsigned)ELF::R_MIPS_NONE;
50 unsigned Kind = (unsigned)Fixup.getKind();
54 llvm_unreachable("invalid fixup kind!");
56 Type = ELF::R_MIPS_32;
59 Type = ELF::R_MIPS_64;
63 Type = setRType((unsigned)ELF::R_MIPS_GPREL32, Type);
64 Type = setRType2((unsigned)ELF::R_MIPS_64, Type);
65 Type = setRType3((unsigned)ELF::R_MIPS_NONE, Type);
68 Type = ELF::R_MIPS_GPREL32;
70 case Mips::fixup_Mips_GPREL16:
71 Type = ELF::R_MIPS_GPREL16;
73 case Mips::fixup_Mips_26:
74 Type = ELF::R_MIPS_26;
76 case Mips::fixup_Mips_CALL16:
77 Type = ELF::R_MIPS_CALL16;
79 case Mips::fixup_Mips_GOT_Global:
80 case Mips::fixup_Mips_GOT_Local:
81 Type = ELF::R_MIPS_GOT16;
83 case Mips::fixup_Mips_HI16:
84 Type = ELF::R_MIPS_HI16;
86 case Mips::fixup_Mips_LO16:
87 Type = ELF::R_MIPS_LO16;
89 case Mips::fixup_Mips_TLSGD:
90 Type = ELF::R_MIPS_TLS_GD;
92 case Mips::fixup_Mips_GOTTPREL:
93 Type = ELF::R_MIPS_TLS_GOTTPREL;
95 case Mips::fixup_Mips_TPREL_HI:
96 Type = ELF::R_MIPS_TLS_TPREL_HI16;
98 case Mips::fixup_Mips_TPREL_LO:
99 Type = ELF::R_MIPS_TLS_TPREL_LO16;
101 case Mips::fixup_Mips_TLSLDM:
102 Type = ELF::R_MIPS_TLS_LDM;
104 case Mips::fixup_Mips_DTPREL_HI:
105 Type = ELF::R_MIPS_TLS_DTPREL_HI16;
107 case Mips::fixup_Mips_DTPREL_LO:
108 Type = ELF::R_MIPS_TLS_DTPREL_LO16;
110 case Mips::fixup_Mips_Branch_PCRel:
111 case Mips::fixup_Mips_PC16:
112 Type = ELF::R_MIPS_PC16;
114 case Mips::fixup_Mips_GOT_PAGE:
115 Type = ELF::R_MIPS_GOT_PAGE;
117 case Mips::fixup_Mips_GOT_OFST:
118 Type = ELF::R_MIPS_GOT_OFST;
120 case Mips::fixup_Mips_GOT_DISP:
121 Type = ELF::R_MIPS_GOT_DISP;
123 case Mips::fixup_Mips_GPOFF_HI:
124 Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
125 Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
126 Type = setRType3((unsigned)ELF::R_MIPS_HI16, Type);
128 case Mips::fixup_Mips_GPOFF_LO:
129 Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
130 Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
131 Type = setRType3((unsigned)ELF::R_MIPS_LO16, Type);
133 case Mips::fixup_Mips_HIGHER:
134 Type = ELF::R_MIPS_HIGHER;
136 case Mips::fixup_Mips_HIGHEST:
137 Type = ELF::R_MIPS_HIGHEST;
139 case Mips::fixup_Mips_GOT_HI16:
140 Type = ELF::R_MIPS_GOT_HI16;
142 case Mips::fixup_Mips_GOT_LO16:
143 Type = ELF::R_MIPS_GOT_LO16;
145 case Mips::fixup_Mips_CALL_HI16:
146 Type = ELF::R_MIPS_CALL_HI16;
148 case Mips::fixup_Mips_CALL_LO16:
149 Type = ELF::R_MIPS_CALL_LO16;
151 case Mips::fixup_MICROMIPS_26_S1:
152 Type = ELF::R_MICROMIPS_26_S1;
154 case Mips::fixup_MICROMIPS_HI16:
155 Type = ELF::R_MICROMIPS_HI16;
157 case Mips::fixup_MICROMIPS_LO16:
158 Type = ELF::R_MICROMIPS_LO16;
160 case Mips::fixup_MICROMIPS_GOT16:
161 Type = ELF::R_MICROMIPS_GOT16;
163 case Mips::fixup_MICROMIPS_PC16_S1:
164 Type = ELF::R_MICROMIPS_PC16_S1;
166 case Mips::fixup_MICROMIPS_CALL16:
167 Type = ELF::R_MICROMIPS_CALL16;
169 case Mips::fixup_MICROMIPS_GOT_DISP:
170 Type = ELF::R_MICROMIPS_GOT_DISP;
172 case Mips::fixup_MICROMIPS_GOT_PAGE:
173 Type = ELF::R_MICROMIPS_GOT_PAGE;
175 case Mips::fixup_MICROMIPS_GOT_OFST:
176 Type = ELF::R_MICROMIPS_GOT_OFST;
178 case Mips::fixup_MICROMIPS_TLS_GD:
179 Type = ELF::R_MICROMIPS_TLS_GD;
181 case Mips::fixup_MICROMIPS_TLS_LDM:
182 Type = ELF::R_MICROMIPS_TLS_LDM;
184 case Mips::fixup_MICROMIPS_TLS_DTPREL_HI16:
185 Type = ELF::R_MICROMIPS_TLS_DTPREL_HI16;
187 case Mips::fixup_MICROMIPS_TLS_DTPREL_LO16:
188 Type = ELF::R_MICROMIPS_TLS_DTPREL_LO16;
190 case Mips::fixup_MICROMIPS_TLS_TPREL_HI16:
191 Type = ELF::R_MICROMIPS_TLS_TPREL_HI16;
193 case Mips::fixup_MICROMIPS_TLS_TPREL_LO16:
194 Type = ELF::R_MICROMIPS_TLS_TPREL_LO16;
196 case Mips::fixup_MIPS_PC21_S2:
197 Type = ELF::R_MIPS_PC21_S2;
199 case Mips::fixup_MIPS_PC26_S2:
200 Type = ELF::R_MIPS_PC26_S2;
202 case Mips::fixup_MIPS_PCHI16:
203 Type = ELF::R_MIPS_PCHI16;
205 case Mips::fixup_MIPS_PCLO16:
206 Type = ELF::R_MIPS_PCLO16;
213 MipsELFObjectWriter::needsRelocateWithSymbol(unsigned Type) const {
214 // FIXME: This is extremelly conservative. This really needs to use a
215 // whitelist with a clear explanation for why each realocation needs to
216 // point to the symbol, not to the section.
221 case ELF::R_MIPS_GOT16:
222 case ELF::R_MIPS16_GOT16:
223 case ELF::R_MICROMIPS_GOT16:
224 llvm_unreachable("Should have been handled already");
226 // These relocations might be paired with another relocation. The pairing is
227 // done by the static linker by matching the symbol. Since we only see one
228 // relocation at a time, we have to force them to relocate with a symbol to
229 // avoid ending up with a pair where one points to a section and another
230 // points to a symbol.
231 case ELF::R_MIPS_HI16:
232 case ELF::R_MIPS16_HI16:
233 case ELF::R_MICROMIPS_HI16:
234 case ELF::R_MIPS_LO16:
235 case ELF::R_MIPS16_LO16:
236 case ELF::R_MICROMIPS_LO16:
242 case ELF::R_MIPS_GPREL16:
247 MCObjectWriter *llvm::createMipsELFObjectWriter(raw_ostream &OS,
251 MCELFObjectTargetWriter *MOTW = new MipsELFObjectWriter(Is64Bit, OSABI,
252 (Is64Bit) ? true : false,
254 return createELFObjectWriter(MOTW, OS, IsLittleEndian);