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_PPC_DTPREL16_HA:
83 Type = ELF::R_PPC64_DTPREL16_HA;
85 case MCSymbolRefExpr::VK_None:
86 Type = ELF::R_PPC_ADDR16_HA;
88 case MCSymbolRefExpr::VK_PPC_TOC16_HA:
89 Type = ELF::R_PPC64_TOC16_HA;
91 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_HA:
92 Type = ELF::R_PPC64_GOT_TLSGD16_HA;
94 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_HA:
95 Type = ELF::R_PPC64_GOT_TLSLD16_HA;
99 case PPC::fixup_ppc_lo16:
101 default: llvm_unreachable("Unsupported Modifier");
102 case MCSymbolRefExpr::VK_PPC_TPREL16_LO:
103 Type = ELF::R_PPC_TPREL16_LO;
105 case MCSymbolRefExpr::VK_PPC_DTPREL16_LO:
106 Type = ELF::R_PPC64_DTPREL16_LO;
108 case MCSymbolRefExpr::VK_None:
109 Type = ELF::R_PPC_ADDR16_LO;
111 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
112 Type = ELF::R_PPC64_TOC16_LO;
114 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_LO:
115 Type = ELF::R_PPC64_GOT_TLSGD16_LO;
117 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_LO:
118 Type = ELF::R_PPC64_GOT_TLSLD16_LO;
122 case PPC::fixup_ppc_lo14:
123 Type = ELF::R_PPC_ADDR14;
125 case PPC::fixup_ppc_toc:
126 Type = ELF::R_PPC64_TOC;
128 case PPC::fixup_ppc_toc16:
129 Type = ELF::R_PPC64_TOC16;
131 case PPC::fixup_ppc_toc16_ds:
133 default: llvm_unreachable("Unsupported Modifier");
134 case MCSymbolRefExpr::VK_PPC_TOC_ENTRY:
135 Type = ELF::R_PPC64_TOC16_DS;
137 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
138 Type = ELF::R_PPC64_TOC16_LO_DS;
140 case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_DS:
141 Type = ELF::R_PPC64_GOT_TPREL16_DS;
145 case PPC::fixup_ppc_tlsreg:
146 Type = ELF::R_PPC64_TLS;
148 case PPC::fixup_ppc_nofixup:
150 default: llvm_unreachable("Unsupported Modifier");
151 case MCSymbolRefExpr::VK_PPC_TLSGD:
152 Type = ELF::R_PPC64_TLSGD;
154 case MCSymbolRefExpr::VK_PPC_TLSLD:
155 Type = ELF::R_PPC64_TLSLD;
161 default: llvm_unreachable("Unsupported Modifier");
162 case MCSymbolRefExpr::VK_PPC_TOC:
163 Type = ELF::R_PPC64_TOC;
165 case MCSymbolRefExpr::VK_None:
166 Type = ELF::R_PPC64_ADDR64;
171 Type = ELF::R_PPC_ADDR32;
174 Type = ELF::R_PPC_ADDR16;
181 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
182 const MCFixup &Fixup,
184 bool IsRelocWithSymbol,
185 int64_t Addend) const {
186 return getRelocTypeInner(Target, Fixup, IsPCRel);
189 const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target,
190 const MCFixup &Fixup,
191 bool IsPCRel) const {
192 assert(Target.getSymA() && "SymA cannot be 0");
193 const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol();
195 unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel);
197 // The .odp creation emits a relocation against the symbol ".TOC." which
198 // create a R_PPC64_TOC relocation. However the relocation symbol name
199 // in final object creation should be NULL, since the symbol does not
200 // really exist, it is just the reference to TOC base for the current
202 bool EmitThisSym = RelocType != ELF::R_PPC64_TOC;
204 if (EmitThisSym && !Symbol.isTemporary())
209 void PPCELFObjectWriter::
210 adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset) {
211 switch ((unsigned)Fixup.getKind()) {
212 case PPC::fixup_ppc_ha16:
213 case PPC::fixup_ppc_lo16:
214 case PPC::fixup_ppc_toc16:
215 case PPC::fixup_ppc_toc16_ds:
223 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
226 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
227 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);