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_ADDR16_HA:
94 Type = ELF::R_PPC_ADDR16_HA;
96 case MCSymbolRefExpr::VK_PPC_TOC16_HA:
97 Type = ELF::R_PPC64_TOC16_HA;
99 case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_HA:
100 Type = ELF::R_PPC64_GOT_TPREL16_HA;
102 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_HA:
103 Type = ELF::R_PPC64_GOT_TLSGD16_HA;
105 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_HA:
106 Type = ELF::R_PPC64_GOT_TLSLD16_HA;
108 case MCSymbolRefExpr::VK_PPC_TPREL16_LO:
109 Type = ELF::R_PPC_TPREL16_LO;
111 case MCSymbolRefExpr::VK_PPC_DTPREL16_LO:
112 Type = ELF::R_PPC64_DTPREL16_LO;
114 case MCSymbolRefExpr::VK_None:
115 Type = ELF::R_PPC_ADDR16;
117 case MCSymbolRefExpr::VK_PPC_ADDR16_LO:
118 Type = ELF::R_PPC_ADDR16_LO;
120 case MCSymbolRefExpr::VK_PPC_TOC_ENTRY:
121 Type = ELF::R_PPC64_TOC16;
123 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
124 Type = ELF::R_PPC64_TOC16_LO;
126 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_LO:
127 Type = ELF::R_PPC64_GOT_TLSGD16_LO;
129 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_LO:
130 Type = ELF::R_PPC64_GOT_TLSLD16_LO;
134 case PPC::fixup_ppc_half16ds:
136 default: llvm_unreachable("Unsupported Modifier");
137 case MCSymbolRefExpr::VK_None:
138 Type = ELF::R_PPC64_ADDR16_DS;
140 case MCSymbolRefExpr::VK_PPC_ADDR16_LO:
141 Type = ELF::R_PPC64_ADDR16_LO_DS;
143 case MCSymbolRefExpr::VK_PPC_TOC_ENTRY:
144 Type = ELF::R_PPC64_TOC16_DS;
146 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
147 Type = ELF::R_PPC64_TOC16_LO_DS;
149 case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_LO:
150 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
154 case PPC::fixup_ppc_tlsreg:
155 Type = ELF::R_PPC64_TLS;
157 case PPC::fixup_ppc_nofixup:
159 default: llvm_unreachable("Unsupported Modifier");
160 case MCSymbolRefExpr::VK_PPC_TLSGD:
161 Type = ELF::R_PPC64_TLSGD;
163 case MCSymbolRefExpr::VK_PPC_TLSLD:
164 Type = ELF::R_PPC64_TLSLD;
170 default: llvm_unreachable("Unsupported Modifier");
171 case MCSymbolRefExpr::VK_PPC_TOC:
172 Type = ELF::R_PPC64_TOC;
174 case MCSymbolRefExpr::VK_None:
175 Type = ELF::R_PPC64_ADDR64;
180 Type = ELF::R_PPC_ADDR32;
183 Type = ELF::R_PPC_ADDR16;
190 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
191 const MCFixup &Fixup,
193 bool IsRelocWithSymbol,
194 int64_t Addend) const {
195 return getRelocTypeInner(Target, Fixup, IsPCRel);
198 const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target,
199 const MCFixup &Fixup,
200 bool IsPCRel) const {
201 assert(Target.getSymA() && "SymA cannot be 0");
202 const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol();
204 unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel);
206 // The .odp creation emits a relocation against the symbol ".TOC." which
207 // create a R_PPC64_TOC relocation. However the relocation symbol name
208 // in final object creation should be NULL, since the symbol does not
209 // really exist, it is just the reference to TOC base for the current
211 bool EmitThisSym = RelocType != ELF::R_PPC64_TOC;
213 if (EmitThisSym && !Symbol.isTemporary())
218 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
221 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
222 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);