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 "MCTargetDesc/PPCMCExpr.h"
13 #include "llvm/ADT/STLExtras.h"
14 #include "llvm/MC/MCELF.h"
15 #include "llvm/MC/MCELFObjectWriter.h"
16 #include "llvm/MC/MCExpr.h"
17 #include "llvm/MC/MCValue.h"
18 #include "llvm/Support/ErrorHandling.h"
23 class PPCELFObjectWriter : public MCELFObjectTargetWriter {
25 PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI);
27 virtual ~PPCELFObjectWriter();
29 virtual unsigned getRelocTypeInner(const MCValue &Target,
32 unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
33 bool IsPCRel) const override;
35 bool needsRelocateWithSymbol(const MCSymbolData &SD,
36 unsigned Type) const override;
40 PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI)
41 : MCELFObjectTargetWriter(Is64Bit, OSABI,
42 Is64Bit ? ELF::EM_PPC64 : ELF::EM_PPC,
43 /*HasRelocationAddend*/ true) {}
45 PPCELFObjectWriter::~PPCELFObjectWriter() {
48 static MCSymbolRefExpr::VariantKind getAccessVariant(const MCValue &Target,
49 const MCFixup &Fixup) {
50 const MCExpr *Expr = Fixup.getValue();
52 if (Expr->getKind() != MCExpr::Target)
53 return Target.getAccessVariant();
55 switch (cast<PPCMCExpr>(Expr)->getKind()) {
56 case PPCMCExpr::VK_PPC_None:
57 return MCSymbolRefExpr::VK_None;
58 case PPCMCExpr::VK_PPC_LO:
59 return MCSymbolRefExpr::VK_PPC_LO;
60 case PPCMCExpr::VK_PPC_HI:
61 return MCSymbolRefExpr::VK_PPC_HI;
62 case PPCMCExpr::VK_PPC_HA:
63 return MCSymbolRefExpr::VK_PPC_HA;
64 case PPCMCExpr::VK_PPC_HIGHERA:
65 return MCSymbolRefExpr::VK_PPC_HIGHERA;
66 case PPCMCExpr::VK_PPC_HIGHER:
67 return MCSymbolRefExpr::VK_PPC_HIGHER;
68 case PPCMCExpr::VK_PPC_HIGHEST:
69 return MCSymbolRefExpr::VK_PPC_HIGHEST;
70 case PPCMCExpr::VK_PPC_HIGHESTA:
71 return MCSymbolRefExpr::VK_PPC_HIGHESTA;
73 llvm_unreachable("unknown PPCMCExpr kind");
76 unsigned PPCELFObjectWriter::getRelocTypeInner(const MCValue &Target,
80 MCSymbolRefExpr::VariantKind Modifier = getAccessVariant(Target, Fixup);
82 // determine the type of the relocation
85 switch ((unsigned)Fixup.getKind()) {
87 llvm_unreachable("Unimplemented");
88 case PPC::fixup_ppc_br24:
89 case PPC::fixup_ppc_br24abs:
91 default: llvm_unreachable("Unsupported Modifier");
92 case MCSymbolRefExpr::VK_None:
93 Type = ELF::R_PPC_REL24;
95 case MCSymbolRefExpr::VK_PLT:
96 Type = ELF::R_PPC_PLTREL24;
100 case PPC::fixup_ppc_brcond14:
101 case PPC::fixup_ppc_brcond14abs:
102 Type = ELF::R_PPC_REL14;
104 case PPC::fixup_ppc_half16:
106 default: llvm_unreachable("Unsupported Modifier");
107 case MCSymbolRefExpr::VK_None:
108 Type = ELF::R_PPC_REL16;
110 case MCSymbolRefExpr::VK_PPC_LO:
111 Type = ELF::R_PPC_REL16_LO;
113 case MCSymbolRefExpr::VK_PPC_HI:
114 Type = ELF::R_PPC_REL16_HI;
116 case MCSymbolRefExpr::VK_PPC_HA:
117 Type = ELF::R_PPC_REL16_HA;
123 Type = ELF::R_PPC_REL32;
127 Type = ELF::R_PPC64_REL64;
131 switch ((unsigned)Fixup.getKind()) {
132 default: llvm_unreachable("invalid fixup kind!");
133 case PPC::fixup_ppc_br24abs:
134 Type = ELF::R_PPC_ADDR24;
136 case PPC::fixup_ppc_brcond14abs:
137 Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_
139 case PPC::fixup_ppc_half16:
141 default: llvm_unreachable("Unsupported Modifier");
142 case MCSymbolRefExpr::VK_None:
143 Type = ELF::R_PPC_ADDR16;
145 case MCSymbolRefExpr::VK_PPC_LO:
146 Type = ELF::R_PPC_ADDR16_LO;
148 case MCSymbolRefExpr::VK_PPC_HI:
149 Type = ELF::R_PPC_ADDR16_HI;
151 case MCSymbolRefExpr::VK_PPC_HA:
152 Type = ELF::R_PPC_ADDR16_HA;
154 case MCSymbolRefExpr::VK_PPC_HIGHER:
155 Type = ELF::R_PPC64_ADDR16_HIGHER;
157 case MCSymbolRefExpr::VK_PPC_HIGHERA:
158 Type = ELF::R_PPC64_ADDR16_HIGHERA;
160 case MCSymbolRefExpr::VK_PPC_HIGHEST:
161 Type = ELF::R_PPC64_ADDR16_HIGHEST;
163 case MCSymbolRefExpr::VK_PPC_HIGHESTA:
164 Type = ELF::R_PPC64_ADDR16_HIGHESTA;
166 case MCSymbolRefExpr::VK_GOT:
167 Type = ELF::R_PPC_GOT16;
169 case MCSymbolRefExpr::VK_PPC_GOT_LO:
170 Type = ELF::R_PPC_GOT16_LO;
172 case MCSymbolRefExpr::VK_PPC_GOT_HI:
173 Type = ELF::R_PPC_GOT16_HI;
175 case MCSymbolRefExpr::VK_PPC_GOT_HA:
176 Type = ELF::R_PPC_GOT16_HA;
178 case MCSymbolRefExpr::VK_PPC_TOC:
179 Type = ELF::R_PPC64_TOC16;
181 case MCSymbolRefExpr::VK_PPC_TOC_LO:
182 Type = ELF::R_PPC64_TOC16_LO;
184 case MCSymbolRefExpr::VK_PPC_TOC_HI:
185 Type = ELF::R_PPC64_TOC16_HI;
187 case MCSymbolRefExpr::VK_PPC_TOC_HA:
188 Type = ELF::R_PPC64_TOC16_HA;
190 case MCSymbolRefExpr::VK_PPC_TPREL:
191 Type = ELF::R_PPC_TPREL16;
193 case MCSymbolRefExpr::VK_PPC_TPREL_LO:
194 Type = ELF::R_PPC_TPREL16_LO;
196 case MCSymbolRefExpr::VK_PPC_TPREL_HI:
197 Type = ELF::R_PPC_TPREL16_HI;
199 case MCSymbolRefExpr::VK_PPC_TPREL_HA:
200 Type = ELF::R_PPC_TPREL16_HA;
202 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHER:
203 Type = ELF::R_PPC64_TPREL16_HIGHER;
205 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHERA:
206 Type = ELF::R_PPC64_TPREL16_HIGHERA;
208 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHEST:
209 Type = ELF::R_PPC64_TPREL16_HIGHEST;
211 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHESTA:
212 Type = ELF::R_PPC64_TPREL16_HIGHESTA;
214 case MCSymbolRefExpr::VK_PPC_DTPREL:
215 Type = ELF::R_PPC64_DTPREL16;
217 case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
218 Type = ELF::R_PPC64_DTPREL16_LO;
220 case MCSymbolRefExpr::VK_PPC_DTPREL_HI:
221 Type = ELF::R_PPC64_DTPREL16_HI;
223 case MCSymbolRefExpr::VK_PPC_DTPREL_HA:
224 Type = ELF::R_PPC64_DTPREL16_HA;
226 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHER:
227 Type = ELF::R_PPC64_DTPREL16_HIGHER;
229 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHERA:
230 Type = ELF::R_PPC64_DTPREL16_HIGHERA;
232 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHEST:
233 Type = ELF::R_PPC64_DTPREL16_HIGHEST;
235 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHESTA:
236 Type = ELF::R_PPC64_DTPREL16_HIGHESTA;
238 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD:
239 Type = ELF::R_PPC64_GOT_TLSGD16;
241 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO:
242 Type = ELF::R_PPC64_GOT_TLSGD16_LO;
244 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HI:
245 Type = ELF::R_PPC64_GOT_TLSGD16_HI;
247 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA:
248 Type = ELF::R_PPC64_GOT_TLSGD16_HA;
250 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD:
251 Type = ELF::R_PPC64_GOT_TLSLD16;
253 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO:
254 Type = ELF::R_PPC64_GOT_TLSLD16_LO;
256 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HI:
257 Type = ELF::R_PPC64_GOT_TLSLD16_HI;
259 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA:
260 Type = ELF::R_PPC64_GOT_TLSLD16_HA;
262 case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
263 /* We don't have R_PPC64_GOT_TPREL16, but since GOT offsets
264 are always 4-aligned, we can use R_PPC64_GOT_TPREL16_DS. */
265 Type = ELF::R_PPC64_GOT_TPREL16_DS;
267 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
268 /* We don't have R_PPC64_GOT_TPREL16_LO, but since GOT offsets
269 are always 4-aligned, we can use R_PPC64_GOT_TPREL16_LO_DS. */
270 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
272 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI:
273 Type = ELF::R_PPC64_GOT_TPREL16_HI;
275 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
276 /* We don't have R_PPC64_GOT_DTPREL16, but since GOT offsets
277 are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_DS. */
278 Type = ELF::R_PPC64_GOT_DTPREL16_DS;
280 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
281 /* We don't have R_PPC64_GOT_DTPREL16_LO, but since GOT offsets
282 are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_LO_DS. */
283 Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
285 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
286 Type = ELF::R_PPC64_GOT_TPREL16_HA;
288 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
289 Type = ELF::R_PPC64_GOT_DTPREL16_HI;
291 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
292 Type = ELF::R_PPC64_GOT_DTPREL16_HA;
296 case PPC::fixup_ppc_half16ds:
298 default: llvm_unreachable("Unsupported Modifier");
299 case MCSymbolRefExpr::VK_None:
300 Type = ELF::R_PPC64_ADDR16_DS;
302 case MCSymbolRefExpr::VK_PPC_LO:
303 Type = ELF::R_PPC64_ADDR16_LO_DS;
305 case MCSymbolRefExpr::VK_GOT:
306 Type = ELF::R_PPC64_GOT16_DS;
308 case MCSymbolRefExpr::VK_PPC_GOT_LO:
309 Type = ELF::R_PPC64_GOT16_LO_DS;
311 case MCSymbolRefExpr::VK_PPC_TOC:
312 Type = ELF::R_PPC64_TOC16_DS;
314 case MCSymbolRefExpr::VK_PPC_TOC_LO:
315 Type = ELF::R_PPC64_TOC16_LO_DS;
317 case MCSymbolRefExpr::VK_PPC_TPREL:
318 Type = ELF::R_PPC64_TPREL16_DS;
320 case MCSymbolRefExpr::VK_PPC_TPREL_LO:
321 Type = ELF::R_PPC64_TPREL16_LO_DS;
323 case MCSymbolRefExpr::VK_PPC_DTPREL:
324 Type = ELF::R_PPC64_DTPREL16_DS;
326 case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
327 Type = ELF::R_PPC64_DTPREL16_LO_DS;
329 case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
330 Type = ELF::R_PPC64_GOT_TPREL16_DS;
332 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
333 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
335 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
336 Type = ELF::R_PPC64_GOT_DTPREL16_DS;
338 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
339 Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
343 case PPC::fixup_ppc_nofixup:
345 default: llvm_unreachable("Unsupported Modifier");
346 case MCSymbolRefExpr::VK_PPC_TLSGD:
347 Type = ELF::R_PPC64_TLSGD;
349 case MCSymbolRefExpr::VK_PPC_TLSLD:
350 Type = ELF::R_PPC64_TLSLD;
352 case MCSymbolRefExpr::VK_PPC_TLS:
353 Type = ELF::R_PPC64_TLS;
359 default: llvm_unreachable("Unsupported Modifier");
360 case MCSymbolRefExpr::VK_PPC_TOCBASE:
361 Type = ELF::R_PPC64_TOC;
363 case MCSymbolRefExpr::VK_None:
364 Type = ELF::R_PPC64_ADDR64;
366 case MCSymbolRefExpr::VK_PPC_DTPMOD:
367 Type = ELF::R_PPC64_DTPMOD64;
369 case MCSymbolRefExpr::VK_PPC_TPREL:
370 Type = ELF::R_PPC64_TPREL64;
372 case MCSymbolRefExpr::VK_PPC_DTPREL:
373 Type = ELF::R_PPC64_DTPREL64;
378 Type = ELF::R_PPC_ADDR32;
381 Type = ELF::R_PPC_ADDR16;
388 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
389 const MCFixup &Fixup,
390 bool IsPCRel) const {
391 return getRelocTypeInner(Target, Fixup, IsPCRel);
394 bool PPCELFObjectWriter::needsRelocateWithSymbol(const MCSymbolData &SD,
395 unsigned Type) const {
400 case ELF::R_PPC_REL24:
401 // If the target symbol has a local entry point, we must keep the
402 // target symbol to preserve that information for the linker.
403 // The "other" values are stored in the last 6 bits of the second byte.
404 // The traditional defines for STO values assume the full byte and thus
405 // the shift to pack it.
406 unsigned Other = MCELF::getOther(SD) << 2;
407 return (Other & ELF::STO_PPC64_LOCAL_MASK) != 0;
411 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
415 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
416 return createELFObjectWriter(MOTW, OS, IsLittleEndian);