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/MC/MCELFObjectWriter.h"
13 #include "llvm/MC/MCExpr.h"
14 #include "llvm/MC/MCValue.h"
15 #include "llvm/Support/ErrorHandling.h"
20 class PPCELFObjectWriter : public MCELFObjectTargetWriter {
22 PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI);
24 virtual ~PPCELFObjectWriter();
26 virtual unsigned getRelocTypeInner(const MCValue &Target,
29 virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
30 bool IsPCRel, bool IsRelocWithSymbol,
31 int64_t Addend) const;
32 virtual const MCSymbol *undefinedExplicitRelSym(const MCValue &Target,
35 virtual void adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset);
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;
64 Type = ELF::R_PPC_REL32;
68 switch ((unsigned)Fixup.getKind()) {
69 default: llvm_unreachable("invalid fixup kind!");
70 case PPC::fixup_ppc_br24:
71 Type = ELF::R_PPC_ADDR24;
73 case PPC::fixup_ppc_brcond14:
74 Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_
76 case PPC::fixup_ppc_ha16:
78 default: llvm_unreachable("Unsupported Modifier");
79 case MCSymbolRefExpr::VK_PPC_TPREL16_HA:
80 Type = ELF::R_PPC_TPREL16_HA;
82 case MCSymbolRefExpr::VK_None:
83 Type = ELF::R_PPC_ADDR16_HA;
85 case MCSymbolRefExpr::VK_PPC_TOC16_HA:
86 Type = ELF::R_PPC64_TOC16_HA;
88 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_HA:
89 Type = ELF::R_PPC64_GOT_TLSGD16_HA;
93 case PPC::fixup_ppc_lo16:
95 default: llvm_unreachable("Unsupported Modifier");
96 case MCSymbolRefExpr::VK_PPC_TPREL16_LO:
97 Type = ELF::R_PPC_TPREL16_LO;
99 case MCSymbolRefExpr::VK_None:
100 Type = ELF::R_PPC_ADDR16_LO;
102 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
103 Type = ELF::R_PPC64_TOC16_LO;
105 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_LO:
106 Type = ELF::R_PPC64_GOT_TLSGD16_LO;
110 case PPC::fixup_ppc_lo14:
111 Type = ELF::R_PPC_ADDR14;
113 case PPC::fixup_ppc_toc:
114 Type = ELF::R_PPC64_TOC;
116 case PPC::fixup_ppc_toc16:
117 Type = ELF::R_PPC64_TOC16;
119 case PPC::fixup_ppc_toc16_ds:
121 default: llvm_unreachable("Unsupported Modifier");
122 case MCSymbolRefExpr::VK_PPC_TOC_ENTRY:
123 Type = ELF::R_PPC64_TOC16_DS;
125 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
126 Type = ELF::R_PPC64_TOC16_LO_DS;
128 case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_DS:
129 Type = ELF::R_PPC64_GOT_TPREL16_DS;
133 case PPC::fixup_ppc_tlsreg:
134 Type = ELF::R_PPC64_TLS;
136 case PPC::fixup_ppc_tlsgd:
137 Type = ELF::R_PPC64_TLSGD;
141 default: llvm_unreachable("Unsupported Modifier");
142 case MCSymbolRefExpr::VK_PPC_TOC:
143 Type = ELF::R_PPC64_TOC;
145 case MCSymbolRefExpr::VK_None:
146 Type = ELF::R_PPC64_ADDR64;
151 Type = ELF::R_PPC_ADDR32;
154 Type = ELF::R_PPC_ADDR16;
161 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
162 const MCFixup &Fixup,
164 bool IsRelocWithSymbol,
165 int64_t Addend) const {
166 return getRelocTypeInner(Target, Fixup, IsPCRel);
169 const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target,
170 const MCFixup &Fixup,
171 bool IsPCRel) const {
172 assert(Target.getSymA() && "SymA cannot be 0");
173 const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol();
175 unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel);
177 // The .odp creation emits a relocation against the symbol ".TOC." which
178 // create a R_PPC64_TOC relocation. However the relocation symbol name
179 // in final object creation should be NULL, since the symbol does not
180 // really exist, it is just the reference to TOC base for the current
182 bool EmitThisSym = RelocType != ELF::R_PPC64_TOC;
184 if (EmitThisSym && !Symbol.isTemporary())
189 void PPCELFObjectWriter::
190 adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset) {
191 switch ((unsigned)Fixup.getKind()) {
192 case PPC::fixup_ppc_ha16:
193 case PPC::fixup_ppc_lo16:
194 case PPC::fixup_ppc_toc16:
195 case PPC::fixup_ppc_toc16_ds:
203 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
206 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
207 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);