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,
36 virtual void adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset);
38 virtual void sortRelocs(const MCAssembler &Asm,
39 std::vector<ELFRelocationEntry> &Relocs);
42 class PPCELFRelocationEntry : public ELFRelocationEntry {
44 PPCELFRelocationEntry(const ELFRelocationEntry &RE);
45 bool operator<(const PPCELFRelocationEntry &RE) const {
46 return (RE.r_offset < r_offset ||
47 (RE.r_offset == r_offset && RE.Type > Type));
52 PPCELFRelocationEntry::PPCELFRelocationEntry(const ELFRelocationEntry &RE)
53 : ELFRelocationEntry(RE.r_offset, RE.Index, RE.Type, RE.Symbol,
54 RE.r_addend, *RE.Fixup) {}
56 PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI)
57 : MCELFObjectTargetWriter(Is64Bit, OSABI,
58 Is64Bit ? ELF::EM_PPC64 : ELF::EM_PPC,
59 /*HasRelocationAddend*/ true) {}
61 PPCELFObjectWriter::~PPCELFObjectWriter() {
64 unsigned PPCELFObjectWriter::getRelocTypeInner(const MCValue &Target,
68 MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
69 MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
71 // determine the type of the relocation
74 switch ((unsigned)Fixup.getKind()) {
76 llvm_unreachable("Unimplemented");
77 case PPC::fixup_ppc_br24:
78 Type = ELF::R_PPC_REL24;
81 Type = ELF::R_PPC_REL32;
85 switch ((unsigned)Fixup.getKind()) {
86 default: llvm_unreachable("invalid fixup kind!");
87 case PPC::fixup_ppc_br24:
88 Type = ELF::R_PPC_ADDR24;
90 case PPC::fixup_ppc_brcond14:
91 Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_
93 case PPC::fixup_ppc_ha16:
95 default: llvm_unreachable("Unsupported Modifier");
96 case MCSymbolRefExpr::VK_PPC_TPREL16_HA:
97 Type = ELF::R_PPC_TPREL16_HA;
99 case MCSymbolRefExpr::VK_PPC_DTPREL16_HA:
100 Type = ELF::R_PPC64_DTPREL16_HA;
102 case MCSymbolRefExpr::VK_None:
103 Type = ELF::R_PPC_ADDR16_HA;
105 case MCSymbolRefExpr::VK_PPC_TOC16_HA:
106 Type = ELF::R_PPC64_TOC16_HA;
108 case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_HA:
109 Type = ELF::R_PPC64_GOT_TPREL16_HA;
111 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_HA:
112 Type = ELF::R_PPC64_GOT_TLSGD16_HA;
114 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_HA:
115 Type = ELF::R_PPC64_GOT_TLSLD16_HA;
119 case PPC::fixup_ppc_lo16:
121 default: llvm_unreachable("Unsupported Modifier");
122 case MCSymbolRefExpr::VK_PPC_TPREL16_LO:
123 Type = ELF::R_PPC_TPREL16_LO;
125 case MCSymbolRefExpr::VK_PPC_DTPREL16_LO:
126 Type = ELF::R_PPC64_DTPREL16_LO;
128 case MCSymbolRefExpr::VK_None:
129 Type = ELF::R_PPC_ADDR16_LO;
131 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
132 Type = ELF::R_PPC64_TOC16_LO;
134 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_LO:
135 Type = ELF::R_PPC64_GOT_TLSGD16_LO;
137 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_LO:
138 Type = ELF::R_PPC64_GOT_TLSLD16_LO;
142 case PPC::fixup_ppc_lo14:
143 Type = ELF::R_PPC_ADDR14;
145 case PPC::fixup_ppc_toc:
146 Type = ELF::R_PPC64_TOC;
148 case PPC::fixup_ppc_toc16:
149 Type = ELF::R_PPC64_TOC16;
151 case PPC::fixup_ppc_toc16_ds:
153 default: llvm_unreachable("Unsupported Modifier");
154 case MCSymbolRefExpr::VK_PPC_TOC_ENTRY:
155 Type = ELF::R_PPC64_TOC16_DS;
157 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
158 Type = ELF::R_PPC64_TOC16_LO_DS;
160 case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_LO:
161 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
165 case PPC::fixup_ppc_tlsreg:
166 Type = ELF::R_PPC64_TLS;
168 case PPC::fixup_ppc_nofixup:
170 default: llvm_unreachable("Unsupported Modifier");
171 case MCSymbolRefExpr::VK_PPC_TLSGD:
172 Type = ELF::R_PPC64_TLSGD;
174 case MCSymbolRefExpr::VK_PPC_TLSLD:
175 Type = ELF::R_PPC64_TLSLD;
181 default: llvm_unreachable("Unsupported Modifier");
182 case MCSymbolRefExpr::VK_PPC_TOC:
183 Type = ELF::R_PPC64_TOC;
185 case MCSymbolRefExpr::VK_None:
186 Type = ELF::R_PPC64_ADDR64;
191 Type = ELF::R_PPC_ADDR32;
194 Type = ELF::R_PPC_ADDR16;
201 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
202 const MCFixup &Fixup,
204 bool IsRelocWithSymbol,
205 int64_t Addend) const {
206 return getRelocTypeInner(Target, Fixup, IsPCRel);
209 const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target,
210 const MCFixup &Fixup,
211 bool IsPCRel) const {
212 assert(Target.getSymA() && "SymA cannot be 0");
213 const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol();
215 unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel);
217 // The .odp creation emits a relocation against the symbol ".TOC." which
218 // create a R_PPC64_TOC relocation. However the relocation symbol name
219 // in final object creation should be NULL, since the symbol does not
220 // really exist, it is just the reference to TOC base for the current
222 bool EmitThisSym = RelocType != ELF::R_PPC64_TOC;
224 if (EmitThisSym && !Symbol.isTemporary())
229 void PPCELFObjectWriter::
230 adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset) {
231 switch ((unsigned)Fixup.getKind()) {
232 case PPC::fixup_ppc_ha16:
233 case PPC::fixup_ppc_lo16:
234 case PPC::fixup_ppc_toc16:
235 case PPC::fixup_ppc_toc16_ds:
243 // The standard sorter only sorts on the r_offset field, but PowerPC can
244 // have multiple relocations at the same offset. Sort secondarily on the
245 // relocation type to avoid nondeterminism.
246 void PPCELFObjectWriter::sortRelocs(const MCAssembler &Asm,
247 std::vector<ELFRelocationEntry> &Relocs) {
249 // Copy to a temporary vector of relocation entries having a different
251 std::vector<PPCELFRelocationEntry> TmpRelocs;
253 for (std::vector<ELFRelocationEntry>::iterator R = Relocs.begin();
254 R != Relocs.end(); ++R) {
255 TmpRelocs.push_back(PPCELFRelocationEntry(*R));
258 // Sort in place by ascending r_offset and descending r_type.
259 array_pod_sort(TmpRelocs.begin(), TmpRelocs.end());
261 // Copy back to the original vector.
263 for (std::vector<PPCELFRelocationEntry>::iterator R = TmpRelocs.begin();
264 R != TmpRelocs.end(); ++R, ++I) {
265 Relocs[I] = ELFRelocationEntry(R->r_offset, R->Index, R->Type,
266 R->Symbol, R->r_addend, *R->Fixup);
271 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
274 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
275 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);