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AArch64ELFObjectWriter.cpp
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1 //===-- AArch64ELFObjectWriter.cpp - AArch64 ELF Writer -------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file handles ELF-specific object emission, converting LLVM's internal
11 // fixups into the appropriate relocations.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "MCTargetDesc/AArch64FixupKinds.h"
16 #include "MCTargetDesc/AArch64MCTargetDesc.h"
17 #include "llvm/MC/MCELFObjectWriter.h"
18 #include "llvm/MC/MCValue.h"
19 #include "llvm/Support/ErrorHandling.h"
20 
21 using namespace llvm;
22 
23 namespace {
24 class AArch64ELFObjectWriter : public MCELFObjectTargetWriter {
25 public:
26  AArch64ELFObjectWriter(uint8_t OSABI);
27 
28  virtual ~AArch64ELFObjectWriter();
29 
30 protected:
31  virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
32  bool IsPCRel, bool IsRelocWithSymbol,
33  int64_t Addend) const;
34 private:
35 };
36 }
37 
38 AArch64ELFObjectWriter::AArch64ELFObjectWriter(uint8_t OSABI)
39  : MCELFObjectTargetWriter(/*Is64Bit*/ true, OSABI, ELF::EM_AARCH64,
40  /*HasRelocationAddend*/ true)
41 {}
42 
43 AArch64ELFObjectWriter::~AArch64ELFObjectWriter()
44 {}
45 
46 unsigned AArch64ELFObjectWriter::GetRelocType(const MCValue &Target,
47  const MCFixup &Fixup,
48  bool IsPCRel,
49  bool IsRelocWithSymbol,
50  int64_t Addend) const {
51  unsigned Type;
52  if (IsPCRel) {
53  switch ((unsigned)Fixup.getKind()) {
54  default:
55  llvm_unreachable("Unimplemented fixup -> relocation");
56  case FK_Data_8:
57  return ELF::R_AARCH64_PREL64;
58  case FK_Data_4:
59  return ELF::R_AARCH64_PREL32;
60  case FK_Data_2:
61  return ELF::R_AARCH64_PREL16;
62  case AArch64::fixup_a64_ld_prel:
63  Type = ELF::R_AARCH64_LD_PREL_LO19;
64  break;
65  case AArch64::fixup_a64_adr_prel:
66  Type = ELF::R_AARCH64_ADR_PREL_LO21;
67  break;
68  case AArch64::fixup_a64_adr_prel_page:
69  Type = ELF::R_AARCH64_ADR_PREL_PG_HI21;
70  break;
71  case AArch64::fixup_a64_adr_prel_got_page:
72  Type = ELF::R_AARCH64_ADR_GOT_PAGE;
73  break;
74  case AArch64::fixup_a64_tstbr:
75  Type = ELF::R_AARCH64_TSTBR14;
76  break;
77  case AArch64::fixup_a64_condbr:
78  Type = ELF::R_AARCH64_CONDBR19;
79  break;
80  case AArch64::fixup_a64_uncondbr:
81  Type = ELF::R_AARCH64_JUMP26;
82  break;
83  case AArch64::fixup_a64_call:
84  Type = ELF::R_AARCH64_CALL26;
85  break;
86  case AArch64::fixup_a64_adr_gottprel_page:
87  Type = ELF::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21;
88  break;
89  case AArch64::fixup_a64_ld_gottprel_prel19:
90  Type = ELF::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19;
91  break;
92  case AArch64::fixup_a64_tlsdesc_adr_page:
93  Type = ELF::R_AARCH64_TLSDESC_ADR_PAGE;
94  break;
95  }
96  } else {
97  switch ((unsigned)Fixup.getKind()) {
98  default:
99  llvm_unreachable("Unimplemented fixup -> relocation");
100  case FK_Data_8:
101  return ELF::R_AARCH64_ABS64;
102  case FK_Data_4:
103  return ELF::R_AARCH64_ABS32;
104  case FK_Data_2:
105  return ELF::R_AARCH64_ABS16;
106  case AArch64::fixup_a64_add_lo12:
107  Type = ELF::R_AARCH64_ADD_ABS_LO12_NC;
108  break;
109  case AArch64::fixup_a64_ld64_got_lo12_nc:
110  Type = ELF::R_AARCH64_LD64_GOT_LO12_NC;
111  break;
112  case AArch64::fixup_a64_ldst8_lo12:
113  Type = ELF::R_AARCH64_LDST8_ABS_LO12_NC;
114  break;
115  case AArch64::fixup_a64_ldst16_lo12:
116  Type = ELF::R_AARCH64_LDST16_ABS_LO12_NC;
117  break;
118  case AArch64::fixup_a64_ldst32_lo12:
119  Type = ELF::R_AARCH64_LDST32_ABS_LO12_NC;
120  break;
121  case AArch64::fixup_a64_ldst64_lo12:
122  Type = ELF::R_AARCH64_LDST64_ABS_LO12_NC;
123  break;
124  case AArch64::fixup_a64_ldst128_lo12:
125  Type = ELF::R_AARCH64_LDST128_ABS_LO12_NC;
126  break;
127  case AArch64::fixup_a64_movw_uabs_g0:
128  Type = ELF::R_AARCH64_MOVW_UABS_G0;
129  break;
130  case AArch64::fixup_a64_movw_uabs_g0_nc:
131  Type = ELF::R_AARCH64_MOVW_UABS_G0_NC;
132  break;
133  case AArch64::fixup_a64_movw_uabs_g1:
134  Type = ELF::R_AARCH64_MOVW_UABS_G1;
135  break;
136  case AArch64::fixup_a64_movw_uabs_g1_nc:
137  Type = ELF::R_AARCH64_MOVW_UABS_G1_NC;
138  break;
139  case AArch64::fixup_a64_movw_uabs_g2:
140  Type = ELF::R_AARCH64_MOVW_UABS_G2;
141  break;
142  case AArch64::fixup_a64_movw_uabs_g2_nc:
143  Type = ELF::R_AARCH64_MOVW_UABS_G2_NC;
144  break;
145  case AArch64::fixup_a64_movw_uabs_g3:
146  Type = ELF::R_AARCH64_MOVW_UABS_G3;
147  break;
148  case AArch64::fixup_a64_movw_sabs_g0:
149  Type = ELF::R_AARCH64_MOVW_SABS_G0;
150  break;
151  case AArch64::fixup_a64_movw_sabs_g1:
152  Type = ELF::R_AARCH64_MOVW_SABS_G1;
153  break;
154  case AArch64::fixup_a64_movw_sabs_g2:
155  Type = ELF::R_AARCH64_MOVW_SABS_G2;
156  break;
157 
158  // TLS Local-dynamic block
159  case AArch64::fixup_a64_movw_dtprel_g2:
160  Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G2;
161  break;
162  case AArch64::fixup_a64_movw_dtprel_g1:
163  Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G1;
164  break;
165  case AArch64::fixup_a64_movw_dtprel_g1_nc:
166  Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G1_NC;
167  break;
168  case AArch64::fixup_a64_movw_dtprel_g0:
169  Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G0;
170  break;
171  case AArch64::fixup_a64_movw_dtprel_g0_nc:
172  Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC;
173  break;
174  case AArch64::fixup_a64_add_dtprel_hi12:
175  Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_HI12;
176  break;
177  case AArch64::fixup_a64_add_dtprel_lo12:
178  Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_LO12;
179  break;
180  case AArch64::fixup_a64_add_dtprel_lo12_nc:
181  Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC;
182  break;
183  case AArch64::fixup_a64_ldst8_dtprel_lo12:
184  Type = ELF::R_AARCH64_TLSLD_LDST8_DTPREL_LO12;
185  break;
186  case AArch64::fixup_a64_ldst8_dtprel_lo12_nc:
187  Type = ELF::R_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC;
188  break;
189  case AArch64::fixup_a64_ldst16_dtprel_lo12:
190  Type = ELF::R_AARCH64_TLSLD_LDST16_DTPREL_LO12;
191  break;
192  case AArch64::fixup_a64_ldst16_dtprel_lo12_nc:
193  Type = ELF::R_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC;
194  break;
195  case AArch64::fixup_a64_ldst32_dtprel_lo12:
196  Type = ELF::R_AARCH64_TLSLD_LDST32_DTPREL_LO12;
197  break;
198  case AArch64::fixup_a64_ldst32_dtprel_lo12_nc:
199  Type = ELF::R_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC;
200  break;
201  case AArch64::fixup_a64_ldst64_dtprel_lo12:
202  Type = ELF::R_AARCH64_TLSLD_LDST64_DTPREL_LO12;
203  break;
204  case AArch64::fixup_a64_ldst64_dtprel_lo12_nc:
205  Type = ELF::R_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC;
206  break;
207 
208  // TLS initial-exec block
209  case AArch64::fixup_a64_movw_gottprel_g1:
210  Type = ELF::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1;
211  break;
212  case AArch64::fixup_a64_movw_gottprel_g0_nc:
213  Type = ELF::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC;
214  break;
215  case AArch64::fixup_a64_ld64_gottprel_lo12_nc:
216  Type = ELF::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC;
217  break;
218 
219  // TLS local-exec block
220  case AArch64::fixup_a64_movw_tprel_g2:
221  Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G2;
222  break;
223  case AArch64::fixup_a64_movw_tprel_g1:
224  Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G1;
225  break;
226  case AArch64::fixup_a64_movw_tprel_g1_nc:
227  Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC;
228  break;
229  case AArch64::fixup_a64_movw_tprel_g0:
230  Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G0;
231  break;
232  case AArch64::fixup_a64_movw_tprel_g0_nc:
233  Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC;
234  break;
235  case AArch64::fixup_a64_add_tprel_hi12:
236  Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_HI12;
237  break;
238  case AArch64::fixup_a64_add_tprel_lo12:
239  Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_LO12;
240  break;
241  case AArch64::fixup_a64_add_tprel_lo12_nc:
242  Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC;
243  break;
244  case AArch64::fixup_a64_ldst8_tprel_lo12:
245  Type = ELF::R_AARCH64_TLSLE_LDST8_TPREL_LO12;
246  break;
247  case AArch64::fixup_a64_ldst8_tprel_lo12_nc:
248  Type = ELF::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC;
249  break;
250  case AArch64::fixup_a64_ldst16_tprel_lo12:
251  Type = ELF::R_AARCH64_TLSLE_LDST16_TPREL_LO12;
252  break;
253  case AArch64::fixup_a64_ldst16_tprel_lo12_nc:
254  Type = ELF::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC;
255  break;
256  case AArch64::fixup_a64_ldst32_tprel_lo12:
257  Type = ELF::R_AARCH64_TLSLE_LDST32_TPREL_LO12;
258  break;
259  case AArch64::fixup_a64_ldst32_tprel_lo12_nc:
260  Type = ELF::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC;
261  break;
262  case AArch64::fixup_a64_ldst64_tprel_lo12:
263  Type = ELF::R_AARCH64_TLSLE_LDST64_TPREL_LO12;
264  break;
265  case AArch64::fixup_a64_ldst64_tprel_lo12_nc:
266  Type = ELF::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC;
267  break;
268 
269  // TLS general-dynamic block
270  case AArch64::fixup_a64_tlsdesc_adr_page:
271  Type = ELF::R_AARCH64_TLSDESC_ADR_PAGE;
272  break;
273  case AArch64::fixup_a64_tlsdesc_ld64_lo12_nc:
274  Type = ELF::R_AARCH64_TLSDESC_LD64_LO12_NC;
275  break;
276  case AArch64::fixup_a64_tlsdesc_add_lo12_nc:
277  Type = ELF::R_AARCH64_TLSDESC_ADD_LO12_NC;
278  break;
279  case AArch64::fixup_a64_tlsdesc_call:
280  Type = ELF::R_AARCH64_TLSDESC_CALL;
281  break;
282  }
283  }
284 
285  return Type;
286 }
287 
288 MCObjectWriter *llvm::createAArch64ELFObjectWriter(raw_ostream &OS,
289  uint8_t OSABI) {
290  MCELFObjectTargetWriter *MOTW = new AArch64ELFObjectWriter(OSABI);
291  return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/true);
292 }
Type
COFF::RelocationTypeX86 Type
Definition: COFFYAML.cpp:227
llvm::createAArch64ELFObjectWriter
MCObjectWriter * createAArch64ELFObjectWriter(raw_ostream &OS, uint8_t OSABI)
Definition: AArch64ELFObjectWriter.cpp:288
llvm_unreachable
#define llvm_unreachable(msg)
Definition: ErrorHandling.h:103
llvm::FK_Data_4
A four-byte fixup.
Definition: MCFixup.h:25
true
#define true
Definition: ConvertUTF.c:65
llvm::MCFixup::getKind
MCFixupKind getKind() const
Definition: MCFixup.h:88
llvm::createELFObjectWriter
MCObjectWriter * createELFObjectWriter(MCELFObjectTargetWriter *MOTW, raw_ostream &OS, bool IsLittleEndian)
Construct a new ELF writer instance.
Definition: ELFObjectWriter.cpp:1614
llvm::FK_Data_8
A eight-byte fixup.
Definition: MCFixup.h:26
llvm::raw_ostream
Definition: raw_ostream.h:31
llvm::FK_Data_2
A two-byte fixup.
Definition: MCFixup.h:24

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