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_None:
88 Type = ELF::R_PPC_ADDR16;
90 case MCSymbolRefExpr::VK_PPC_LO:
91 Type = ELF::R_PPC_ADDR16_LO;
93 case MCSymbolRefExpr::VK_PPC_HI:
94 Type = ELF::R_PPC_ADDR16_HI;
96 case MCSymbolRefExpr::VK_PPC_HA:
97 Type = ELF::R_PPC_ADDR16_HA;
99 case MCSymbolRefExpr::VK_PPC_TOC:
100 Type = ELF::R_PPC64_TOC16;
102 case MCSymbolRefExpr::VK_PPC_TOC_LO:
103 Type = ELF::R_PPC64_TOC16_LO;
105 case MCSymbolRefExpr::VK_PPC_TOC_HI:
106 Type = ELF::R_PPC64_TOC16_HI;
108 case MCSymbolRefExpr::VK_PPC_TOC_HA:
109 Type = ELF::R_PPC64_TOC16_HA;
111 case MCSymbolRefExpr::VK_PPC_TPREL_LO:
112 Type = ELF::R_PPC_TPREL16_LO;
114 case MCSymbolRefExpr::VK_PPC_TPREL_HA:
115 Type = ELF::R_PPC_TPREL16_HA;
117 case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
118 Type = ELF::R_PPC64_DTPREL16_LO;
120 case MCSymbolRefExpr::VK_PPC_DTPREL_HA:
121 Type = ELF::R_PPC64_DTPREL16_HA;
123 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO:
124 Type = ELF::R_PPC64_GOT_TLSGD16_LO;
126 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA:
127 Type = ELF::R_PPC64_GOT_TLSGD16_HA;
129 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO:
130 Type = ELF::R_PPC64_GOT_TLSLD16_LO;
132 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA:
133 Type = ELF::R_PPC64_GOT_TLSLD16_HA;
135 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
136 Type = ELF::R_PPC64_GOT_TPREL16_HA;
140 case PPC::fixup_ppc_half16ds:
142 default: llvm_unreachable("Unsupported Modifier");
143 case MCSymbolRefExpr::VK_None:
144 Type = ELF::R_PPC64_ADDR16_DS;
146 case MCSymbolRefExpr::VK_PPC_LO:
147 Type = ELF::R_PPC64_ADDR16_LO_DS;
149 case MCSymbolRefExpr::VK_PPC_TOC:
150 Type = ELF::R_PPC64_TOC16_DS;
152 case MCSymbolRefExpr::VK_PPC_TOC_LO:
153 Type = ELF::R_PPC64_TOC16_LO_DS;
155 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
156 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
160 case PPC::fixup_ppc_tlsreg:
161 Type = ELF::R_PPC64_TLS;
163 case PPC::fixup_ppc_nofixup:
165 default: llvm_unreachable("Unsupported Modifier");
166 case MCSymbolRefExpr::VK_PPC_TLSGD:
167 Type = ELF::R_PPC64_TLSGD;
169 case MCSymbolRefExpr::VK_PPC_TLSLD:
170 Type = ELF::R_PPC64_TLSLD;
176 default: llvm_unreachable("Unsupported Modifier");
177 case MCSymbolRefExpr::VK_PPC_TOCBASE:
178 Type = ELF::R_PPC64_TOC;
180 case MCSymbolRefExpr::VK_None:
181 Type = ELF::R_PPC64_ADDR64;
186 Type = ELF::R_PPC_ADDR32;
189 Type = ELF::R_PPC_ADDR16;
196 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
197 const MCFixup &Fixup,
199 bool IsRelocWithSymbol,
200 int64_t Addend) const {
201 return getRelocTypeInner(Target, Fixup, IsPCRel);
204 const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target,
205 const MCFixup &Fixup,
206 bool IsPCRel) const {
207 assert(Target.getSymA() && "SymA cannot be 0");
208 const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol();
210 unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel);
212 // The .odp creation emits a relocation against the symbol ".TOC." which
213 // create a R_PPC64_TOC relocation. However the relocation symbol name
214 // in final object creation should be NULL, since the symbol does not
215 // really exist, it is just the reference to TOC base for the current
217 bool EmitThisSym = RelocType != ELF::R_PPC64_TOC;
219 if (EmitThisSym && !Symbol.isTemporary())
224 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
227 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
228 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);