1 //===-- PPCELFObjectWriter.cpp - PPC 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/PPCMCTargetDesc.h"
11 #include "MCTargetDesc/PPCFixupKinds.h"
12 #include "llvm/ADT/STLExtras.h"
13 #include "llvm/MC/MCELFObjectWriter.h"
14 #include "llvm/MC/MCExpr.h"
15 #include "llvm/MC/MCValue.h"
16 #include "llvm/Support/ErrorHandling.h"
21 class PPCELFObjectWriter : public MCELFObjectTargetWriter {
23 PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI);
25 virtual ~PPCELFObjectWriter();
27 virtual unsigned getRelocTypeInner(const MCValue &Target,
30 virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
31 bool IsPCRel, bool IsRelocWithSymbol,
32 int64_t Addend) const;
33 virtual const MCSymbol *undefinedExplicitRelSym(const MCValue &Target,
39 PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI)
40 : MCELFObjectTargetWriter(Is64Bit, OSABI,
41 Is64Bit ? ELF::EM_PPC64 : ELF::EM_PPC,
42 /*HasRelocationAddend*/ true) {}
44 PPCELFObjectWriter::~PPCELFObjectWriter() {
47 unsigned PPCELFObjectWriter::getRelocTypeInner(const MCValue &Target,
51 MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
52 MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
54 // determine the type of the relocation
57 switch ((unsigned)Fixup.getKind()) {
59 llvm_unreachable("Unimplemented");
60 case PPC::fixup_ppc_br24:
61 Type = ELF::R_PPC_REL24;
63 case PPC::fixup_ppc_brcond14:
64 Type = ELF::R_PPC_REL14;
68 Type = ELF::R_PPC_REL32;
72 Type = ELF::R_PPC64_REL64;
76 switch ((unsigned)Fixup.getKind()) {
77 default: llvm_unreachable("invalid fixup kind!");
78 case PPC::fixup_ppc_br24:
79 Type = ELF::R_PPC_ADDR24;
81 case PPC::fixup_ppc_brcond14:
82 Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_
84 case PPC::fixup_ppc_half16:
86 default: llvm_unreachable("Unsupported Modifier");
87 case MCSymbolRefExpr::VK_PPC_TPREL16_HA:
88 Type = ELF::R_PPC_TPREL16_HA;
90 case MCSymbolRefExpr::VK_PPC_DTPREL16_HA:
91 Type = ELF::R_PPC64_DTPREL16_HA;
93 case MCSymbolRefExpr::VK_PPC_GAS_HA16:
94 case MCSymbolRefExpr::VK_PPC_DARWIN_HA16:
95 Type = ELF::R_PPC_ADDR16_HA;
97 case MCSymbolRefExpr::VK_PPC_TOC16_HA:
98 Type = ELF::R_PPC64_TOC16_HA;
100 case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_HA:
101 Type = ELF::R_PPC64_GOT_TPREL16_HA;
103 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_HA:
104 Type = ELF::R_PPC64_GOT_TLSGD16_HA;
106 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_HA:
107 Type = ELF::R_PPC64_GOT_TLSLD16_HA;
109 case MCSymbolRefExpr::VK_PPC_TPREL16_LO:
110 Type = ELF::R_PPC_TPREL16_LO;
112 case MCSymbolRefExpr::VK_PPC_DTPREL16_LO:
113 Type = ELF::R_PPC64_DTPREL16_LO;
115 case MCSymbolRefExpr::VK_None:
116 Type = ELF::R_PPC_ADDR16;
118 case MCSymbolRefExpr::VK_PPC_GAS_LO16:
119 case MCSymbolRefExpr::VK_PPC_DARWIN_LO16:
120 Type = ELF::R_PPC_ADDR16_LO;
122 case MCSymbolRefExpr::VK_PPC_TOC_ENTRY:
123 Type = ELF::R_PPC64_TOC16;
125 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
126 Type = ELF::R_PPC64_TOC16_LO;
128 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_LO:
129 Type = ELF::R_PPC64_GOT_TLSGD16_LO;
131 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_LO:
132 Type = ELF::R_PPC64_GOT_TLSLD16_LO;
136 case PPC::fixup_ppc_half16ds:
138 default: llvm_unreachable("Unsupported Modifier");
139 case MCSymbolRefExpr::VK_None:
140 Type = ELF::R_PPC64_ADDR16_DS;
142 case MCSymbolRefExpr::VK_PPC_GAS_LO16:
143 case MCSymbolRefExpr::VK_PPC_DARWIN_LO16:
144 Type = ELF::R_PPC64_ADDR16_LO_DS;
146 case MCSymbolRefExpr::VK_PPC_TOC_ENTRY:
147 Type = ELF::R_PPC64_TOC16_DS;
149 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
150 Type = ELF::R_PPC64_TOC16_LO_DS;
152 case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_LO:
153 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
157 case PPC::fixup_ppc_tlsreg:
158 Type = ELF::R_PPC64_TLS;
160 case PPC::fixup_ppc_nofixup:
162 default: llvm_unreachable("Unsupported Modifier");
163 case MCSymbolRefExpr::VK_PPC_TLSGD:
164 Type = ELF::R_PPC64_TLSGD;
166 case MCSymbolRefExpr::VK_PPC_TLSLD:
167 Type = ELF::R_PPC64_TLSLD;
173 default: llvm_unreachable("Unsupported Modifier");
174 case MCSymbolRefExpr::VK_PPC_TOC:
175 Type = ELF::R_PPC64_TOC;
177 case MCSymbolRefExpr::VK_None:
178 Type = ELF::R_PPC64_ADDR64;
183 Type = ELF::R_PPC_ADDR32;
186 Type = ELF::R_PPC_ADDR16;
193 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
194 const MCFixup &Fixup,
196 bool IsRelocWithSymbol,
197 int64_t Addend) const {
198 return getRelocTypeInner(Target, Fixup, IsPCRel);
201 const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target,
202 const MCFixup &Fixup,
203 bool IsPCRel) const {
204 assert(Target.getSymA() && "SymA cannot be 0");
205 const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol();
207 unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel);
209 // The .odp creation emits a relocation against the symbol ".TOC." which
210 // create a R_PPC64_TOC relocation. However the relocation symbol name
211 // in final object creation should be NULL, since the symbol does not
212 // really exist, it is just the reference to TOC base for the current
214 bool EmitThisSym = RelocType != ELF::R_PPC64_TOC;
216 if (EmitThisSym && !Symbol.isTemporary())
221 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
224 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
225 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);